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diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index b88ca36ba..de8c327ae 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1,1525 +1,1602 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "interpreter.h"
-#include "primitives/transaction.h"
#include "crypto/ripemd160.h"
#include "crypto/sha1.h"
#include "crypto/sha256.h"
+#include "primitives/transaction.h"
#include "pubkey.h"
#include "script/script.h"
#include "uint256.h"
using namespace std;
typedef vector<unsigned char> valtype;
namespace {
-inline bool set_success(ScriptError* ret)
-{
- if (ret)
- *ret = SCRIPT_ERR_OK;
+inline bool set_success(ScriptError *ret) {
+ if (ret) *ret = SCRIPT_ERR_OK;
return true;
}
-inline bool set_error(ScriptError* ret, const ScriptError serror)
-{
- if (ret)
- *ret = serror;
+inline bool set_error(ScriptError *ret, const ScriptError serror) {
+ if (ret) *ret = serror;
return false;
}
} // anon namespace
-bool CastToBool(const valtype& vch)
-{
- for (unsigned int i = 0; i < vch.size(); i++)
- {
- if (vch[i] != 0)
- {
+bool CastToBool(const valtype &vch) {
+ for (unsigned int i = 0; i < vch.size(); i++) {
+ if (vch[i] != 0) {
// Can be negative zero
- if (i == vch.size()-1 && vch[i] == 0x80)
- return false;
+ if (i == vch.size() - 1 && vch[i] == 0x80) return false;
return true;
}
}
return false;
}
/**
* Script is a stack machine (like Forth) that evaluates a predicate
* returning a bool indicating valid or not. There are no loops.
*/
-#define stacktop(i) (stack.at(stack.size()+(i)))
-#define altstacktop(i) (altstack.at(altstack.size()+(i)))
-static inline void popstack(vector<valtype>& stack)
-{
- if (stack.empty())
- throw runtime_error("popstack(): stack empty");
+#define stacktop(i) (stack.at(stack.size() + (i)))
+#define altstacktop(i) (altstack.at(altstack.size() + (i)))
+static inline void popstack(vector<valtype> &stack) {
+ if (stack.empty()) throw runtime_error("popstack(): stack empty");
stack.pop_back();
}
bool static IsCompressedOrUncompressedPubKey(const valtype &vchPubKey) {
if (vchPubKey.size() < 33) {
// Non-canonical public key: too short
return false;
}
if (vchPubKey[0] == 0x04) {
if (vchPubKey.size() != 65) {
// Non-canonical public key: invalid length for uncompressed key
return false;
}
} else if (vchPubKey[0] == 0x02 || vchPubKey[0] == 0x03) {
if (vchPubKey.size() != 33) {
// Non-canonical public key: invalid length for compressed key
return false;
}
} else {
// Non-canonical public key: neither compressed nor uncompressed
return false;
}
return true;
}
bool static IsCompressedPubKey(const valtype &vchPubKey) {
if (vchPubKey.size() != 33) {
// Non-canonical public key: invalid length for compressed key
return false;
}
if (vchPubKey[0] != 0x02 && vchPubKey[0] != 0x03) {
// Non-canonical public key: invalid prefix for compressed key
return false;
}
return true;
}
/**
- * A canonical signature exists of: <30> <total len> <02> <len R> <R> <02> <len S> <S> <hashtype>
- * Where R and S are not negative (their first byte has its highest bit not set), and not
- * excessively padded (do not start with a 0 byte, unless an otherwise negative number follows,
- * in which case a single 0 byte is necessary and even required).
- *
+ * A canonical signature exists of: <30> <total len> <02> <len R> <R> <02> <len
+ * S> <S> <hashtype>, where R and S are not negative (their first byte has its
+ * highest bit not set), and not excessively padded (do not start with a 0 byte,
+ * unless an otherwise negative number follows, in which case a single 0 byte is
+ * necessary and even required).
+ *
* See https://bitcointalk.org/index.php?topic=8392.msg127623#msg127623
*
* This function is consensus-critical since BIP66.
*/
bool static IsValidSignatureEncoding(const std::vector<unsigned char> &sig) {
- // Format: 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S] [sighash]
+ // Format: 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]
+ // [sighash]
// * total-length: 1-byte length descriptor of everything that follows,
- // excluding the sighash byte.
+ // excluding the sighash byte.
// * R-length: 1-byte length descriptor of the R value that follows.
- // * R: arbitrary-length big-endian encoded R value. It must use the shortest
- // possible encoding for a positive integers (which means no null bytes at
- // the start, except a single one when the next byte has its highest bit set).
+ // * R: arbitrary-length big-endian encoded R value. It must use the
+ // shortest possible encoding for a positive integers (which means no null
+ // bytes at the start, except a single one when the next byte has its
+ // highest bit set).
// * S-length: 1-byte length descriptor of the S value that follows.
// * S: arbitrary-length big-endian encoded S value. The same rules apply.
- // * sighash: 1-byte value indicating what data is hashed (not part of the DER
- // signature)
+ // * sighash: 1-byte value indicating what data is hashed (not part of the
+ // DER signature)
// Minimum and maximum size constraints.
if (sig.size() < 9) return false;
if (sig.size() > 73) return false;
// A signature is of type 0x30 (compound).
if (sig[0] != 0x30) return false;
// Make sure the length covers the entire signature.
if (sig[1] != sig.size() - 3) return false;
// Extract the length of the R element.
unsigned int lenR = sig[3];
// Make sure the length of the S element is still inside the signature.
if (5 + lenR >= sig.size()) return false;
// Extract the length of the S element.
unsigned int lenS = sig[5 + lenR];
// Verify that the length of the signature matches the sum of the length
// of the elements.
if ((size_t)(lenR + lenS + 7) != sig.size()) return false;
-
+
// Check whether the R element is an integer.
if (sig[2] != 0x02) return false;
// Zero-length integers are not allowed for R.
if (lenR == 0) return false;
// Negative numbers are not allowed for R.
if (sig[4] & 0x80) return false;
- // Null bytes at the start of R are not allowed, unless R would
- // otherwise be interpreted as a negative number.
+ // Null bytes at the start of R are not allowed, unless R would otherwise be
+ // interpreted as a negative number.
if (lenR > 1 && (sig[4] == 0x00) && !(sig[5] & 0x80)) return false;
// Check whether the S element is an integer.
if (sig[lenR + 4] != 0x02) return false;
// Zero-length integers are not allowed for S.
if (lenS == 0) return false;
// Negative numbers are not allowed for S.
if (sig[lenR + 6] & 0x80) return false;
// Null bytes at the start of S are not allowed, unless S would otherwise be
// interpreted as a negative number.
- if (lenS > 1 && (sig[lenR + 6] == 0x00) && !(sig[lenR + 7] & 0x80)) return false;
+ if (lenS > 1 && (sig[lenR + 6] == 0x00) && !(sig[lenR + 7] & 0x80))
+ return false;
return true;
}
-bool static IsLowDERSignature(const valtype &vchSig, ScriptError* serror) {
+bool static IsLowDERSignature(const valtype &vchSig, ScriptError *serror) {
if (!IsValidSignatureEncoding(vchSig)) {
return set_error(serror, SCRIPT_ERR_SIG_DER);
}
- std::vector<unsigned char> vchSigCopy(vchSig.begin(), vchSig.begin() + vchSig.size() - 1);
+ std::vector<unsigned char> vchSigCopy(vchSig.begin(),
+ vchSig.begin() + vchSig.size() - 1);
if (!CPubKey::CheckLowS(vchSigCopy)) {
return set_error(serror, SCRIPT_ERR_SIG_HIGH_S);
}
return true;
}
bool static IsDefinedHashtypeSignature(const valtype &vchSig) {
if (vchSig.size() == 0) {
return false;
}
- unsigned char nHashType = vchSig[vchSig.size() - 1] & (~(SIGHASH_ANYONECANPAY));
- if (nHashType < SIGHASH_ALL || nHashType > SIGHASH_SINGLE)
- return false;
+ unsigned char nHashType =
+ vchSig[vchSig.size() - 1] & (~(SIGHASH_ANYONECANPAY));
+ if (nHashType < SIGHASH_ALL || nHashType > SIGHASH_SINGLE) return false;
return true;
}
-bool CheckSignatureEncoding(const vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror) {
+bool CheckSignatureEncoding(const vector<unsigned char> &vchSig,
+ unsigned int flags, ScriptError *serror) {
// Empty signature. Not strictly DER encoded, but allowed to provide a
// compact way to provide an invalid signature for use with CHECK(MULTI)SIG
if (vchSig.size() == 0) {
return true;
}
- if ((flags & (SCRIPT_VERIFY_DERSIG | SCRIPT_VERIFY_LOW_S | SCRIPT_VERIFY_STRICTENC)) != 0 && !IsValidSignatureEncoding(vchSig)) {
+ if ((flags & (SCRIPT_VERIFY_DERSIG | SCRIPT_VERIFY_LOW_S |
+ SCRIPT_VERIFY_STRICTENC)) != 0 &&
+ !IsValidSignatureEncoding(vchSig)) {
return set_error(serror, SCRIPT_ERR_SIG_DER);
- } else if ((flags & SCRIPT_VERIFY_LOW_S) != 0 && !IsLowDERSignature(vchSig, serror)) {
+ } else if ((flags & SCRIPT_VERIFY_LOW_S) != 0 &&
+ !IsLowDERSignature(vchSig, serror)) {
// serror is set
return false;
- } else if ((flags & SCRIPT_VERIFY_STRICTENC) != 0 && !IsDefinedHashtypeSignature(vchSig)) {
+ } else if ((flags & SCRIPT_VERIFY_STRICTENC) != 0 &&
+ !IsDefinedHashtypeSignature(vchSig)) {
return set_error(serror, SCRIPT_ERR_SIG_HASHTYPE);
}
return true;
}
-bool static CheckPubKeyEncoding(const valtype &vchPubKey, unsigned int flags, const SigVersion &sigversion, ScriptError* serror) {
- if ((flags & SCRIPT_VERIFY_STRICTENC) != 0 && !IsCompressedOrUncompressedPubKey(vchPubKey)) {
+bool static CheckPubKeyEncoding(const valtype &vchPubKey, unsigned int flags,
+ const SigVersion &sigversion,
+ ScriptError *serror) {
+ if ((flags & SCRIPT_VERIFY_STRICTENC) != 0 &&
+ !IsCompressedOrUncompressedPubKey(vchPubKey)) {
return set_error(serror, SCRIPT_ERR_PUBKEYTYPE);
}
// Only compressed keys are accepted in segwit
- if ((flags & SCRIPT_VERIFY_WITNESS_PUBKEYTYPE) != 0 && sigversion == SIGVERSION_WITNESS_V0 && !IsCompressedPubKey(vchPubKey)) {
+ if ((flags & SCRIPT_VERIFY_WITNESS_PUBKEYTYPE) != 0 &&
+ sigversion == SIGVERSION_WITNESS_V0 && !IsCompressedPubKey(vchPubKey)) {
return set_error(serror, SCRIPT_ERR_WITNESS_PUBKEYTYPE);
}
return true;
}
-bool static CheckMinimalPush(const valtype& data, opcodetype opcode) {
+bool static CheckMinimalPush(const valtype &data, opcodetype opcode) {
if (data.size() == 0) {
// Could have used OP_0.
return opcode == OP_0;
} else if (data.size() == 1 && data[0] >= 1 && data[0] <= 16) {
// Could have used OP_1 .. OP_16.
return opcode == OP_1 + (data[0] - 1);
} else if (data.size() == 1 && data[0] == 0x81) {
// Could have used OP_1NEGATE.
return opcode == OP_1NEGATE;
} else if (data.size() <= 75) {
- // Could have used a direct push (opcode indicating number of bytes pushed + those bytes).
+ // Could have used a direct push (opcode indicating number of bytes
+ // pushed + those bytes).
return opcode == data.size();
} else if (data.size() <= 255) {
// Could have used OP_PUSHDATA.
return opcode == OP_PUSHDATA1;
} else if (data.size() <= 65535) {
// Could have used OP_PUSHDATA2.
return opcode == OP_PUSHDATA2;
}
return true;
}
-bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* serror)
-{
+bool EvalScript(vector<vector<unsigned char>> &stack, const CScript &script,
+ unsigned int flags, const BaseSignatureChecker &checker,
+ SigVersion sigversion, ScriptError *serror) {
static const CScriptNum bnZero(0);
static const CScriptNum bnOne(1);
static const CScriptNum bnFalse(0);
static const CScriptNum bnTrue(1);
static const valtype vchFalse(0);
static const valtype vchZero(0);
static const valtype vchTrue(1, 1);
CScript::const_iterator pc = script.begin();
CScript::const_iterator pend = script.end();
CScript::const_iterator pbegincodehash = script.begin();
opcodetype opcode;
valtype vchPushValue;
vector<bool> vfExec;
vector<valtype> altstack;
set_error(serror, SCRIPT_ERR_UNKNOWN_ERROR);
if (script.size() > MAX_SCRIPT_SIZE)
return set_error(serror, SCRIPT_ERR_SCRIPT_SIZE);
int nOpCount = 0;
bool fRequireMinimal = (flags & SCRIPT_VERIFY_MINIMALDATA) != 0;
- try
- {
- while (pc < pend)
- {
+ try {
+ while (pc < pend) {
bool fExec = !count(vfExec.begin(), vfExec.end(), false);
//
// Read instruction
//
if (!script.GetOp(pc, opcode, vchPushValue))
return set_error(serror, SCRIPT_ERR_BAD_OPCODE);
if (vchPushValue.size() > MAX_SCRIPT_ELEMENT_SIZE)
return set_error(serror, SCRIPT_ERR_PUSH_SIZE);
// Note how OP_RESERVED does not count towards the opcode limit.
if (opcode > OP_16 && ++nOpCount > MAX_OPS_PER_SCRIPT)
return set_error(serror, SCRIPT_ERR_OP_COUNT);
- if (opcode == OP_CAT ||
- opcode == OP_SUBSTR ||
- opcode == OP_LEFT ||
- opcode == OP_RIGHT ||
- opcode == OP_INVERT ||
- opcode == OP_AND ||
- opcode == OP_OR ||
- opcode == OP_XOR ||
- opcode == OP_2MUL ||
- opcode == OP_2DIV ||
- opcode == OP_MUL ||
- opcode == OP_DIV ||
- opcode == OP_MOD ||
- opcode == OP_LSHIFT ||
- opcode == OP_RSHIFT)
- return set_error(serror, SCRIPT_ERR_DISABLED_OPCODE); // Disabled opcodes.
+ if (opcode == OP_CAT || opcode == OP_SUBSTR || opcode == OP_LEFT ||
+ opcode == OP_RIGHT || opcode == OP_INVERT || opcode == OP_AND ||
+ opcode == OP_OR || opcode == OP_XOR || opcode == OP_2MUL ||
+ opcode == OP_2DIV || opcode == OP_MUL || opcode == OP_DIV ||
+ opcode == OP_MOD || opcode == OP_LSHIFT || opcode == OP_RSHIFT)
+ return set_error(
+ serror, SCRIPT_ERR_DISABLED_OPCODE); // Disabled opcodes.
if (fExec && 0 <= opcode && opcode <= OP_PUSHDATA4) {
- if (fRequireMinimal && !CheckMinimalPush(vchPushValue, opcode)) {
+ if (fRequireMinimal &&
+ !CheckMinimalPush(vchPushValue, opcode)) {
return set_error(serror, SCRIPT_ERR_MINIMALDATA);
}
stack.push_back(vchPushValue);
} else if (fExec || (OP_IF <= opcode && opcode <= OP_ENDIF))
- switch (opcode)
- {
- //
- // Push value
- //
- case OP_1NEGATE:
- case OP_1:
- case OP_2:
- case OP_3:
- case OP_4:
- case OP_5:
- case OP_6:
- case OP_7:
- case OP_8:
- case OP_9:
- case OP_10:
- case OP_11:
- case OP_12:
- case OP_13:
- case OP_14:
- case OP_15:
- case OP_16:
- {
- // ( -- value)
- CScriptNum bn((int)opcode - (int)(OP_1 - 1));
- stack.push_back(bn.getvch());
- // The result of these opcodes should always be the minimal way to push the data
- // they push, so no need for a CheckMinimalPush here.
- }
- break;
-
-
- //
- // Control
- //
- case OP_NOP:
- break;
-
- case OP_CHECKLOCKTIMEVERIFY:
- {
- if (!(flags & SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY)) {
- // not enabled; treat as a NOP2
- if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS) {
- return set_error(serror, SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
- }
- break;
- }
-
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ switch (opcode) {
+ //
+ // Push value
+ //
+ case OP_1NEGATE:
+ case OP_1:
+ case OP_2:
+ case OP_3:
+ case OP_4:
+ case OP_5:
+ case OP_6:
+ case OP_7:
+ case OP_8:
+ case OP_9:
+ case OP_10:
+ case OP_11:
+ case OP_12:
+ case OP_13:
+ case OP_14:
+ case OP_15:
+ case OP_16: {
+ // ( -- value)
+ CScriptNum bn((int)opcode - (int)(OP_1 - 1));
+ stack.push_back(bn.getvch());
+ // The result of these opcodes should always be the
+ // minimal way to push the data they push, so no need
+ // for a CheckMinimalPush here.
+ } break;
- // Note that elsewhere numeric opcodes are limited to
- // operands in the range -2**31+1 to 2**31-1, however it is
- // legal for opcodes to produce results exceeding that
- // range. This limitation is implemented by CScriptNum's
- // default 4-byte limit.
//
- // If we kept to that limit we'd have a year 2038 problem,
- // even though the nLockTime field in transactions
- // themselves is uint32 which only becomes meaningless
- // after the year 2106.
+ // Control
//
- // Thus as a special case we tell CScriptNum to accept up
- // to 5-byte bignums, which are good until 2**39-1, well
- // beyond the 2**32-1 limit of the nLockTime field itself.
- const CScriptNum nLockTime(stacktop(-1), fRequireMinimal, 5);
-
- // In the rare event that the argument may be < 0 due to
- // some arithmetic being done first, you can always use
- // 0 MAX CHECKLOCKTIMEVERIFY.
- if (nLockTime < 0)
- return set_error(serror, SCRIPT_ERR_NEGATIVE_LOCKTIME);
-
- // Actually compare the specified lock time with the transaction.
- if (!checker.CheckLockTime(nLockTime))
- return set_error(serror, SCRIPT_ERR_UNSATISFIED_LOCKTIME);
-
- break;
- }
+ case OP_NOP:
+ break;
- case OP_CHECKSEQUENCEVERIFY:
- {
- if (!(flags & SCRIPT_VERIFY_CHECKSEQUENCEVERIFY)) {
- // not enabled; treat as a NOP3
- if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS) {
- return set_error(serror, SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
+ case OP_CHECKLOCKTIMEVERIFY: {
+ if (!(flags & SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY)) {
+ // not enabled; treat as a NOP2
+ if (flags &
+ SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS) {
+ return set_error(
+ serror,
+ SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
+ }
+ break;
}
+
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+
+ // Note that elsewhere numeric opcodes are limited to
+ // operands in the range -2**31+1 to 2**31-1, however it
+ // is legal for opcodes to produce results exceeding
+ // that range. This limitation is implemented by
+ // CScriptNum's default 4-byte limit.
+ //
+ // If we kept to that limit we'd have a year 2038
+ // problem, even though the nLockTime field in
+ // transactions themselves is uint32 which only becomes
+ // meaningless after the year 2106.
+ //
+ // Thus as a special case we tell CScriptNum to accept
+ // up to 5-byte bignums, which are good until 2**39-1,
+ // well beyond the 2**32-1 limit of the nLockTime field
+ // itself.
+ const CScriptNum nLockTime(stacktop(-1),
+ fRequireMinimal, 5);
+
+ // In the rare event that the argument may be < 0 due to
+ // some arithmetic being done first, you can always use
+ // 0 MAX CHECKLOCKTIMEVERIFY.
+ if (nLockTime < 0)
+ return set_error(serror,
+ SCRIPT_ERR_NEGATIVE_LOCKTIME);
+
+ // Actually compare the specified lock time with the
+ // transaction.
+ if (!checker.CheckLockTime(nLockTime))
+ return set_error(serror,
+ SCRIPT_ERR_UNSATISFIED_LOCKTIME);
+
break;
}
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
-
- // nSequence, like nLockTime, is a 32-bit unsigned integer
- // field. See the comment in CHECKLOCKTIMEVERIFY regarding
- // 5-byte numeric operands.
- const CScriptNum nSequence(stacktop(-1), fRequireMinimal, 5);
+ case OP_CHECKSEQUENCEVERIFY: {
+ if (!(flags & SCRIPT_VERIFY_CHECKSEQUENCEVERIFY)) {
+ // not enabled; treat as a NOP3
+ if (flags &
+ SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS) {
+ return set_error(
+ serror,
+ SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
+ }
+ break;
+ }
- // In the rare event that the argument may be < 0 due to
- // some arithmetic being done first, you can always use
- // 0 MAX CHECKSEQUENCEVERIFY.
- if (nSequence < 0)
- return set_error(serror, SCRIPT_ERR_NEGATIVE_LOCKTIME);
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+
+ // nSequence, like nLockTime, is a 32-bit unsigned
+ // integer field. See the comment in CHECKLOCKTIMEVERIFY
+ // regarding 5-byte numeric operands.
+ const CScriptNum nSequence(stacktop(-1),
+ fRequireMinimal, 5);
+
+ // In the rare event that the argument may be < 0 due to
+ // some arithmetic being done first, you can always use
+ // 0 MAX CHECKSEQUENCEVERIFY.
+ if (nSequence < 0)
+ return set_error(serror,
+ SCRIPT_ERR_NEGATIVE_LOCKTIME);
+
+ // To provide for future soft-fork extensibility, if the
+ // operand has the disabled lock-time flag set,
+ // CHECKSEQUENCEVERIFY behaves as a NOP.
+ if ((nSequence &
+ CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG) != 0)
+ break;
+
+ // Compare the specified sequence number with the input.
+ if (!checker.CheckSequence(nSequence))
+ return set_error(serror,
+ SCRIPT_ERR_UNSATISFIED_LOCKTIME);
- // To provide for future soft-fork extensibility, if the
- // operand has the disabled lock-time flag set,
- // CHECKSEQUENCEVERIFY behaves as a NOP.
- if ((nSequence & CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG) != 0)
break;
+ }
- // Compare the specified sequence number with the input.
- if (!checker.CheckSequence(nSequence))
- return set_error(serror, SCRIPT_ERR_UNSATISFIED_LOCKTIME);
+ case OP_NOP1:
+ case OP_NOP4:
+ case OP_NOP5:
+ case OP_NOP6:
+ case OP_NOP7:
+ case OP_NOP8:
+ case OP_NOP9:
+ case OP_NOP10: {
+ if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS)
+ return set_error(
+ serror, SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
+ } break;
+
+ case OP_IF:
+ case OP_NOTIF: {
+ // <expression> if [statements] [else [statements]]
+ // endif
+ bool fValue = false;
+ if (fExec) {
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_UNBALANCED_CONDITIONAL);
+ valtype &vch = stacktop(-1);
+ if (sigversion == SIGVERSION_WITNESS_V0 &&
+ (flags & SCRIPT_VERIFY_MINIMALIF)) {
+ if (vch.size() > 1)
+ return set_error(serror,
+ SCRIPT_ERR_MINIMALIF);
+ if (vch.size() == 1 && vch[0] != 1)
+ return set_error(serror,
+ SCRIPT_ERR_MINIMALIF);
+ }
+ fValue = CastToBool(vch);
+ if (opcode == OP_NOTIF) fValue = !fValue;
+ popstack(stack);
+ }
+ vfExec.push_back(fValue);
+ } break;
+
+ case OP_ELSE: {
+ if (vfExec.empty())
+ return set_error(serror,
+ SCRIPT_ERR_UNBALANCED_CONDITIONAL);
+ vfExec.back() = !vfExec.back();
+ } break;
+
+ case OP_ENDIF: {
+ if (vfExec.empty())
+ return set_error(serror,
+ SCRIPT_ERR_UNBALANCED_CONDITIONAL);
+ vfExec.pop_back();
+ } break;
+
+ case OP_VERIFY: {
+ // (true -- ) or
+ // (false -- false) and return
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ bool fValue = CastToBool(stacktop(-1));
+ if (fValue)
+ popstack(stack);
+ else
+ return set_error(serror, SCRIPT_ERR_VERIFY);
+ } break;
- break;
- }
+ case OP_RETURN: {
+ return set_error(serror, SCRIPT_ERR_OP_RETURN);
+ } break;
- case OP_NOP1: case OP_NOP4: case OP_NOP5:
- case OP_NOP6: case OP_NOP7: case OP_NOP8: case OP_NOP9: case OP_NOP10:
- {
- if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS)
- return set_error(serror, SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS);
- }
- break;
-
- case OP_IF:
- case OP_NOTIF:
- {
- // <expression> if [statements] [else [statements]] endif
- bool fValue = false;
- if (fExec)
- {
+ //
+ // Stack ops
+ //
+ case OP_TOALTSTACK: {
if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_UNBALANCED_CONDITIONAL);
- valtype& vch = stacktop(-1);
- if (sigversion == SIGVERSION_WITNESS_V0 && (flags & SCRIPT_VERIFY_MINIMALIF)) {
- if (vch.size() > 1)
- return set_error(serror, SCRIPT_ERR_MINIMALIF);
- if (vch.size() == 1 && vch[0] != 1)
- return set_error(serror, SCRIPT_ERR_MINIMALIF);
- }
- fValue = CastToBool(vch);
- if (opcode == OP_NOTIF)
- fValue = !fValue;
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ altstack.push_back(stacktop(-1));
popstack(stack);
- }
- vfExec.push_back(fValue);
- }
- break;
-
- case OP_ELSE:
- {
- if (vfExec.empty())
- return set_error(serror, SCRIPT_ERR_UNBALANCED_CONDITIONAL);
- vfExec.back() = !vfExec.back();
- }
- break;
-
- case OP_ENDIF:
- {
- if (vfExec.empty())
- return set_error(serror, SCRIPT_ERR_UNBALANCED_CONDITIONAL);
- vfExec.pop_back();
- }
- break;
-
- case OP_VERIFY:
- {
- // (true -- ) or
- // (false -- false) and return
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- bool fValue = CastToBool(stacktop(-1));
- if (fValue)
+ } break;
+
+ case OP_FROMALTSTACK: {
+ if (altstack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_ALTSTACK_OPERATION);
+ stack.push_back(altstacktop(-1));
+ popstack(altstack);
+ } break;
+
+ case OP_2DROP: {
+ // (x1 x2 -- )
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
popstack(stack);
- else
- return set_error(serror, SCRIPT_ERR_VERIFY);
- }
- break;
+ popstack(stack);
+ } break;
+
+ case OP_2DUP: {
+ // (x1 x2 -- x1 x2 x1 x2)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch1 = stacktop(-2);
+ valtype vch2 = stacktop(-1);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ } break;
+
+ case OP_3DUP: {
+ // (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
+ if (stack.size() < 3)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch1 = stacktop(-3);
+ valtype vch2 = stacktop(-2);
+ valtype vch3 = stacktop(-1);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ stack.push_back(vch3);
+ } break;
+
+ case OP_2OVER: {
+ // (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
+ if (stack.size() < 4)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch1 = stacktop(-4);
+ valtype vch2 = stacktop(-3);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ } break;
+
+ case OP_2ROT: {
+ // (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
+ if (stack.size() < 6)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch1 = stacktop(-6);
+ valtype vch2 = stacktop(-5);
+ stack.erase(stack.end() - 6, stack.end() - 4);
+ stack.push_back(vch1);
+ stack.push_back(vch2);
+ } break;
+
+ case OP_2SWAP: {
+ // (x1 x2 x3 x4 -- x3 x4 x1 x2)
+ if (stack.size() < 4)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ swap(stacktop(-4), stacktop(-2));
+ swap(stacktop(-3), stacktop(-1));
+ } break;
+
+ case OP_IFDUP: {
+ // (x - 0 | x x)
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch = stacktop(-1);
+ if (CastToBool(vch)) stack.push_back(vch);
+ } break;
+
+ case OP_DEPTH: {
+ // -- stacksize
+ CScriptNum bn(stack.size());
+ stack.push_back(bn.getvch());
+ } break;
+
+ case OP_DROP: {
+ // (x -- )
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ popstack(stack);
+ } break;
- case OP_RETURN:
- {
- return set_error(serror, SCRIPT_ERR_OP_RETURN);
- }
- break;
-
-
- //
- // Stack ops
- //
- case OP_TOALTSTACK:
- {
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- altstack.push_back(stacktop(-1));
- popstack(stack);
- }
- break;
-
- case OP_FROMALTSTACK:
- {
- if (altstack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_ALTSTACK_OPERATION);
- stack.push_back(altstacktop(-1));
- popstack(altstack);
- }
- break;
-
- case OP_2DROP:
- {
- // (x1 x2 -- )
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- popstack(stack);
- popstack(stack);
- }
- break;
-
- case OP_2DUP:
- {
- // (x1 x2 -- x1 x2 x1 x2)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch1 = stacktop(-2);
- valtype vch2 = stacktop(-1);
- stack.push_back(vch1);
- stack.push_back(vch2);
- }
- break;
-
- case OP_3DUP:
- {
- // (x1 x2 x3 -- x1 x2 x3 x1 x2 x3)
- if (stack.size() < 3)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch1 = stacktop(-3);
- valtype vch2 = stacktop(-2);
- valtype vch3 = stacktop(-1);
- stack.push_back(vch1);
- stack.push_back(vch2);
- stack.push_back(vch3);
- }
- break;
-
- case OP_2OVER:
- {
- // (x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2)
- if (stack.size() < 4)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch1 = stacktop(-4);
- valtype vch2 = stacktop(-3);
- stack.push_back(vch1);
- stack.push_back(vch2);
- }
- break;
-
- case OP_2ROT:
- {
- // (x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2)
- if (stack.size() < 6)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch1 = stacktop(-6);
- valtype vch2 = stacktop(-5);
- stack.erase(stack.end()-6, stack.end()-4);
- stack.push_back(vch1);
- stack.push_back(vch2);
- }
- break;
-
- case OP_2SWAP:
- {
- // (x1 x2 x3 x4 -- x3 x4 x1 x2)
- if (stack.size() < 4)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- swap(stacktop(-4), stacktop(-2));
- swap(stacktop(-3), stacktop(-1));
- }
- break;
-
- case OP_IFDUP:
- {
- // (x - 0 | x x)
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch = stacktop(-1);
- if (CastToBool(vch))
+ case OP_DUP: {
+ // (x -- x x)
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch = stacktop(-1);
stack.push_back(vch);
- }
- break;
-
- case OP_DEPTH:
- {
- // -- stacksize
- CScriptNum bn(stack.size());
- stack.push_back(bn.getvch());
- }
- break;
-
- case OP_DROP:
- {
- // (x -- )
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- popstack(stack);
- }
- break;
-
- case OP_DUP:
- {
- // (x -- x x)
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch = stacktop(-1);
- stack.push_back(vch);
- }
- break;
-
- case OP_NIP:
- {
- // (x1 x2 -- x2)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- stack.erase(stack.end() - 2);
- }
- break;
-
- case OP_OVER:
- {
- // (x1 x2 -- x1 x2 x1)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch = stacktop(-2);
- stack.push_back(vch);
- }
- break;
-
- case OP_PICK:
- case OP_ROLL:
- {
- // (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
- // (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- int n = CScriptNum(stacktop(-1), fRequireMinimal).getint();
- popstack(stack);
- if (n < 0 || n >= (int)stack.size())
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch = stacktop(-n-1);
- if (opcode == OP_ROLL)
- stack.erase(stack.end()-n-1);
- stack.push_back(vch);
- }
- break;
-
- case OP_ROT:
- {
- // (x1 x2 x3 -- x2 x3 x1)
- // x2 x1 x3 after first swap
- // x2 x3 x1 after second swap
- if (stack.size() < 3)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- swap(stacktop(-3), stacktop(-2));
- swap(stacktop(-2), stacktop(-1));
- }
- break;
-
- case OP_SWAP:
- {
- // (x1 x2 -- x2 x1)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- swap(stacktop(-2), stacktop(-1));
- }
- break;
-
- case OP_TUCK:
- {
- // (x1 x2 -- x2 x1 x2)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype vch = stacktop(-1);
- stack.insert(stack.end()-2, vch);
- }
- break;
-
+ } break;
+
+ case OP_NIP: {
+ // (x1 x2 -- x2)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ stack.erase(stack.end() - 2);
+ } break;
+
+ case OP_OVER: {
+ // (x1 x2 -- x1 x2 x1)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch = stacktop(-2);
+ stack.push_back(vch);
+ } break;
+
+ case OP_PICK:
+ case OP_ROLL: {
+ // (xn ... x2 x1 x0 n - xn ... x2 x1 x0 xn)
+ // (xn ... x2 x1 x0 n - ... x2 x1 x0 xn)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ int n =
+ CScriptNum(stacktop(-1), fRequireMinimal).getint();
+ popstack(stack);
+ if (n < 0 || n >= (int)stack.size())
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch = stacktop(-n - 1);
+ if (opcode == OP_ROLL) stack.erase(stack.end() - n - 1);
+ stack.push_back(vch);
+ } break;
+
+ case OP_ROT: {
+ // (x1 x2 x3 -- x2 x3 x1)
+ // x2 x1 x3 after first swap
+ // x2 x3 x1 after second swap
+ if (stack.size() < 3)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ swap(stacktop(-3), stacktop(-2));
+ swap(stacktop(-2), stacktop(-1));
+ } break;
+
+ case OP_SWAP: {
+ // (x1 x2 -- x2 x1)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ swap(stacktop(-2), stacktop(-1));
+ } break;
+
+ case OP_TUCK: {
+ // (x1 x2 -- x2 x1 x2)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype vch = stacktop(-1);
+ stack.insert(stack.end() - 2, vch);
+ } break;
+
+ case OP_SIZE: {
+ // (in -- in size)
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ CScriptNum bn(stacktop(-1).size());
+ stack.push_back(bn.getvch());
+ } break;
- case OP_SIZE:
- {
- // (in -- in size)
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- CScriptNum bn(stacktop(-1).size());
- stack.push_back(bn.getvch());
- }
- break;
-
-
- //
- // Bitwise logic
- //
- case OP_EQUAL:
- case OP_EQUALVERIFY:
- //case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
- {
- // (x1 x2 - bool)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype& vch1 = stacktop(-2);
- valtype& vch2 = stacktop(-1);
- bool fEqual = (vch1 == vch2);
- // OP_NOTEQUAL is disabled because it would be too easy to say
- // something like n != 1 and have some wiseguy pass in 1 with extra
- // zero bytes after it (numerically, 0x01 == 0x0001 == 0x000001)
- //if (opcode == OP_NOTEQUAL)
- // fEqual = !fEqual;
- popstack(stack);
- popstack(stack);
- stack.push_back(fEqual ? vchTrue : vchFalse);
- if (opcode == OP_EQUALVERIFY)
- {
- if (fEqual)
+ //
+ // Bitwise logic
+ //
+ case OP_EQUAL:
+ case OP_EQUALVERIFY:
+ // case OP_NOTEQUAL: // use OP_NUMNOTEQUAL
+ {
+ // (x1 x2 - bool)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype &vch1 = stacktop(-2);
+ valtype &vch2 = stacktop(-1);
+ bool fEqual = (vch1 == vch2);
+ // OP_NOTEQUAL is disabled because it would be too
+ // easy to say something like n != 1 and have some
+ // wiseguy pass in 1 with extra zero bytes after it
+ // (numerically, 0x01 == 0x0001 == 0x000001)
+ // if (opcode == OP_NOTEQUAL)
+ // fEqual = !fEqual;
popstack(stack);
- else
- return set_error(serror, SCRIPT_ERR_EQUALVERIFY);
- }
- }
- break;
-
-
- //
- // Numeric
- //
- case OP_1ADD:
- case OP_1SUB:
- case OP_NEGATE:
- case OP_ABS:
- case OP_NOT:
- case OP_0NOTEQUAL:
- {
- // (in -- out)
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- CScriptNum bn(stacktop(-1), fRequireMinimal);
- switch (opcode)
- {
- case OP_1ADD: bn += bnOne; break;
- case OP_1SUB: bn -= bnOne; break;
- case OP_NEGATE: bn = -bn; break;
- case OP_ABS: if (bn < bnZero) bn = -bn; break;
- case OP_NOT: bn = (bn == bnZero); break;
- case OP_0NOTEQUAL: bn = (bn != bnZero); break;
- default: assert(!"invalid opcode"); break;
- }
- popstack(stack);
- stack.push_back(bn.getvch());
- }
- break;
-
- case OP_ADD:
- case OP_SUB:
- case OP_BOOLAND:
- case OP_BOOLOR:
- case OP_NUMEQUAL:
- case OP_NUMEQUALVERIFY:
- case OP_NUMNOTEQUAL:
- case OP_LESSTHAN:
- case OP_GREATERTHAN:
- case OP_LESSTHANOREQUAL:
- case OP_GREATERTHANOREQUAL:
- case OP_MIN:
- case OP_MAX:
- {
- // (x1 x2 -- out)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- CScriptNum bn1(stacktop(-2), fRequireMinimal);
- CScriptNum bn2(stacktop(-1), fRequireMinimal);
- CScriptNum bn(0);
- switch (opcode)
- {
- case OP_ADD:
- bn = bn1 + bn2;
- break;
-
- case OP_SUB:
- bn = bn1 - bn2;
- break;
-
- case OP_BOOLAND: bn = (bn1 != bnZero && bn2 != bnZero); break;
- case OP_BOOLOR: bn = (bn1 != bnZero || bn2 != bnZero); break;
- case OP_NUMEQUAL: bn = (bn1 == bn2); break;
- case OP_NUMEQUALVERIFY: bn = (bn1 == bn2); break;
- case OP_NUMNOTEQUAL: bn = (bn1 != bn2); break;
- case OP_LESSTHAN: bn = (bn1 < bn2); break;
- case OP_GREATERTHAN: bn = (bn1 > bn2); break;
- case OP_LESSTHANOREQUAL: bn = (bn1 <= bn2); break;
- case OP_GREATERTHANOREQUAL: bn = (bn1 >= bn2); break;
- case OP_MIN: bn = (bn1 < bn2 ? bn1 : bn2); break;
- case OP_MAX: bn = (bn1 > bn2 ? bn1 : bn2); break;
- default: assert(!"invalid opcode"); break;
- }
- popstack(stack);
- popstack(stack);
- stack.push_back(bn.getvch());
-
- if (opcode == OP_NUMEQUALVERIFY)
- {
- if (CastToBool(stacktop(-1)))
popstack(stack);
- else
- return set_error(serror, SCRIPT_ERR_NUMEQUALVERIFY);
- }
- }
- break;
-
- case OP_WITHIN:
- {
- // (x min max -- out)
- if (stack.size() < 3)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- CScriptNum bn1(stacktop(-3), fRequireMinimal);
- CScriptNum bn2(stacktop(-2), fRequireMinimal);
- CScriptNum bn3(stacktop(-1), fRequireMinimal);
- bool fValue = (bn2 <= bn1 && bn1 < bn3);
- popstack(stack);
- popstack(stack);
- popstack(stack);
- stack.push_back(fValue ? vchTrue : vchFalse);
- }
- break;
-
-
- //
- // Crypto
- //
- case OP_RIPEMD160:
- case OP_SHA1:
- case OP_SHA256:
- case OP_HASH160:
- case OP_HASH256:
- {
- // (in -- hash)
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- valtype& vch = stacktop(-1);
- valtype vchHash((opcode == OP_RIPEMD160 || opcode == OP_SHA1 || opcode == OP_HASH160) ? 20 : 32);
- if (opcode == OP_RIPEMD160)
- CRIPEMD160().Write(vch.data(), vch.size()).Finalize(vchHash.data());
- else if (opcode == OP_SHA1)
- CSHA1().Write(vch.data(), vch.size()).Finalize(vchHash.data());
- else if (opcode == OP_SHA256)
- CSHA256().Write(vch.data(), vch.size()).Finalize(vchHash.data());
- else if (opcode == OP_HASH160)
- CHash160().Write(vch.data(), vch.size()).Finalize(vchHash.data());
- else if (opcode == OP_HASH256)
- CHash256().Write(vch.data(), vch.size()).Finalize(vchHash.data());
- popstack(stack);
- stack.push_back(vchHash);
- }
- break;
-
- case OP_CODESEPARATOR:
- {
- // Hash starts after the code separator
- pbegincodehash = pc;
- }
- break;
-
- case OP_CHECKSIG:
- case OP_CHECKSIGVERIFY:
- {
- // (sig pubkey -- bool)
- if (stack.size() < 2)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
-
- valtype& vchSig = stacktop(-2);
- valtype& vchPubKey = stacktop(-1);
-
- // Subset of script starting at the most recent codeseparator
- CScript scriptCode(pbegincodehash, pend);
-
- // Drop the signature in pre-segwit scripts but not segwit scripts
- if (sigversion == SIGVERSION_BASE) {
- scriptCode.FindAndDelete(CScript(vchSig));
- }
+ stack.push_back(fEqual ? vchTrue : vchFalse);
+ if (opcode == OP_EQUALVERIFY) {
+ if (fEqual)
+ popstack(stack);
+ else
+ return set_error(serror,
+ SCRIPT_ERR_EQUALVERIFY);
+ }
+ }
+ break;
- if (!CheckSignatureEncoding(vchSig, flags, serror) || !CheckPubKeyEncoding(vchPubKey, flags, sigversion, serror)) {
- //serror is set
- return false;
- }
- bool fSuccess = checker.CheckSig(vchSig, vchPubKey, scriptCode, sigversion);
+ //
+ // Numeric
+ //
+ case OP_1ADD:
+ case OP_1SUB:
+ case OP_NEGATE:
+ case OP_ABS:
+ case OP_NOT:
+ case OP_0NOTEQUAL: {
+ // (in -- out)
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ CScriptNum bn(stacktop(-1), fRequireMinimal);
+ switch (opcode) {
+ case OP_1ADD:
+ bn += bnOne;
+ break;
+ case OP_1SUB:
+ bn -= bnOne;
+ break;
+ case OP_NEGATE:
+ bn = -bn;
+ break;
+ case OP_ABS:
+ if (bn < bnZero) bn = -bn;
+ break;
+ case OP_NOT:
+ bn = (bn == bnZero);
+ break;
+ case OP_0NOTEQUAL:
+ bn = (bn != bnZero);
+ break;
+ default:
+ assert(!"invalid opcode");
+ break;
+ }
+ popstack(stack);
+ stack.push_back(bn.getvch());
+ } break;
- if (!fSuccess && (flags & SCRIPT_VERIFY_NULLFAIL) && vchSig.size())
- return set_error(serror, SCRIPT_ERR_SIG_NULLFAIL);
+ case OP_ADD:
+ case OP_SUB:
+ case OP_BOOLAND:
+ case OP_BOOLOR:
+ case OP_NUMEQUAL:
+ case OP_NUMEQUALVERIFY:
+ case OP_NUMNOTEQUAL:
+ case OP_LESSTHAN:
+ case OP_GREATERTHAN:
+ case OP_LESSTHANOREQUAL:
+ case OP_GREATERTHANOREQUAL:
+ case OP_MIN:
+ case OP_MAX: {
+ // (x1 x2 -- out)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ CScriptNum bn1(stacktop(-2), fRequireMinimal);
+ CScriptNum bn2(stacktop(-1), fRequireMinimal);
+ CScriptNum bn(0);
+ switch (opcode) {
+ case OP_ADD:
+ bn = bn1 + bn2;
+ break;
+
+ case OP_SUB:
+ bn = bn1 - bn2;
+ break;
+
+ case OP_BOOLAND:
+ bn = (bn1 != bnZero && bn2 != bnZero);
+ break;
+ case OP_BOOLOR:
+ bn = (bn1 != bnZero || bn2 != bnZero);
+ break;
+ case OP_NUMEQUAL:
+ bn = (bn1 == bn2);
+ break;
+ case OP_NUMEQUALVERIFY:
+ bn = (bn1 == bn2);
+ break;
+ case OP_NUMNOTEQUAL:
+ bn = (bn1 != bn2);
+ break;
+ case OP_LESSTHAN:
+ bn = (bn1 < bn2);
+ break;
+ case OP_GREATERTHAN:
+ bn = (bn1 > bn2);
+ break;
+ case OP_LESSTHANOREQUAL:
+ bn = (bn1 <= bn2);
+ break;
+ case OP_GREATERTHANOREQUAL:
+ bn = (bn1 >= bn2);
+ break;
+ case OP_MIN:
+ bn = (bn1 < bn2 ? bn1 : bn2);
+ break;
+ case OP_MAX:
+ bn = (bn1 > bn2 ? bn1 : bn2);
+ break;
+ default:
+ assert(!"invalid opcode");
+ break;
+ }
+ popstack(stack);
+ popstack(stack);
+ stack.push_back(bn.getvch());
+
+ if (opcode == OP_NUMEQUALVERIFY) {
+ if (CastToBool(stacktop(-1)))
+ popstack(stack);
+ else
+ return set_error(serror,
+ SCRIPT_ERR_NUMEQUALVERIFY);
+ }
+ } break;
+
+ case OP_WITHIN: {
+ // (x min max -- out)
+ if (stack.size() < 3)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ CScriptNum bn1(stacktop(-3), fRequireMinimal);
+ CScriptNum bn2(stacktop(-2), fRequireMinimal);
+ CScriptNum bn3(stacktop(-1), fRequireMinimal);
+ bool fValue = (bn2 <= bn1 && bn1 < bn3);
+ popstack(stack);
+ popstack(stack);
+ popstack(stack);
+ stack.push_back(fValue ? vchTrue : vchFalse);
+ } break;
- popstack(stack);
- popstack(stack);
- stack.push_back(fSuccess ? vchTrue : vchFalse);
- if (opcode == OP_CHECKSIGVERIFY)
- {
- if (fSuccess)
- popstack(stack);
- else
- return set_error(serror, SCRIPT_ERR_CHECKSIGVERIFY);
- }
- }
- break;
-
- case OP_CHECKMULTISIG:
- case OP_CHECKMULTISIGVERIFY:
- {
- // ([sig ...] num_of_signatures [pubkey ...] num_of_pubkeys -- bool)
-
- int i = 1;
- if ((int)stack.size() < i)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
-
- int nKeysCount = CScriptNum(stacktop(-i), fRequireMinimal).getint();
- if (nKeysCount < 0 || nKeysCount > MAX_PUBKEYS_PER_MULTISIG)
- return set_error(serror, SCRIPT_ERR_PUBKEY_COUNT);
- nOpCount += nKeysCount;
- if (nOpCount > MAX_OPS_PER_SCRIPT)
- return set_error(serror, SCRIPT_ERR_OP_COUNT);
- int ikey = ++i;
- // ikey2 is the position of last non-signature item in the stack. Top stack item = 1.
- // With SCRIPT_VERIFY_NULLFAIL, this is used for cleanup if operation fails.
- int ikey2 = nKeysCount + 2;
- i += nKeysCount;
- if ((int)stack.size() < i)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
-
- int nSigsCount = CScriptNum(stacktop(-i), fRequireMinimal).getint();
- if (nSigsCount < 0 || nSigsCount > nKeysCount)
- return set_error(serror, SCRIPT_ERR_SIG_COUNT);
- int isig = ++i;
- i += nSigsCount;
- if ((int)stack.size() < i)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
-
- // Subset of script starting at the most recent codeseparator
- CScript scriptCode(pbegincodehash, pend);
-
- // Drop the signature in pre-segwit scripts but not segwit scripts
- for (int k = 0; k < nSigsCount; k++)
- {
- valtype& vchSig = stacktop(-isig-k);
+ //
+ // Crypto
+ //
+ case OP_RIPEMD160:
+ case OP_SHA1:
+ case OP_SHA256:
+ case OP_HASH160:
+ case OP_HASH256: {
+ // (in -- hash)
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ valtype &vch = stacktop(-1);
+ valtype vchHash((opcode == OP_RIPEMD160 ||
+ opcode == OP_SHA1 ||
+ opcode == OP_HASH160)
+ ? 20
+ : 32);
+ if (opcode == OP_RIPEMD160)
+ CRIPEMD160()
+ .Write(vch.data(), vch.size())
+ .Finalize(vchHash.data());
+ else if (opcode == OP_SHA1)
+ CSHA1()
+ .Write(vch.data(), vch.size())
+ .Finalize(vchHash.data());
+ else if (opcode == OP_SHA256)
+ CSHA256()
+ .Write(vch.data(), vch.size())
+ .Finalize(vchHash.data());
+ else if (opcode == OP_HASH160)
+ CHash160()
+ .Write(vch.data(), vch.size())
+ .Finalize(vchHash.data());
+ else if (opcode == OP_HASH256)
+ CHash256()
+ .Write(vch.data(), vch.size())
+ .Finalize(vchHash.data());
+ popstack(stack);
+ stack.push_back(vchHash);
+ } break;
+
+ case OP_CODESEPARATOR: {
+ // Hash starts after the code separator
+ pbegincodehash = pc;
+ } break;
+
+ case OP_CHECKSIG:
+ case OP_CHECKSIGVERIFY: {
+ // (sig pubkey -- bool)
+ if (stack.size() < 2)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+
+ valtype &vchSig = stacktop(-2);
+ valtype &vchPubKey = stacktop(-1);
+
+ // Subset of script starting at the most recent
+ // codeseparator
+ CScript scriptCode(pbegincodehash, pend);
+
+ // Drop the signature in pre-segwit scripts but not
+ // segwit scripts
if (sigversion == SIGVERSION_BASE) {
scriptCode.FindAndDelete(CScript(vchSig));
}
- }
-
- bool fSuccess = true;
- while (fSuccess && nSigsCount > 0)
- {
- valtype& vchSig = stacktop(-isig);
- valtype& vchPubKey = stacktop(-ikey);
- // Note how this makes the exact order of pubkey/signature evaluation
- // distinguishable by CHECKMULTISIG NOT if the STRICTENC flag is set.
- // See the script_(in)valid tests for details.
- if (!CheckSignatureEncoding(vchSig, flags, serror) || !CheckPubKeyEncoding(vchPubKey, flags, sigversion, serror)) {
+ if (!CheckSignatureEncoding(vchSig, flags, serror) ||
+ !CheckPubKeyEncoding(vchPubKey, flags, sigversion,
+ serror)) {
// serror is set
return false;
}
+ bool fSuccess = checker.CheckSig(
+ vchSig, vchPubKey, scriptCode, sigversion);
- // Check signature
- bool fOk = checker.CheckSig(vchSig, vchPubKey, scriptCode, sigversion);
+ if (!fSuccess && (flags & SCRIPT_VERIFY_NULLFAIL) &&
+ vchSig.size())
+ return set_error(serror, SCRIPT_ERR_SIG_NULLFAIL);
- if (fOk) {
- isig++;
- nSigsCount--;
+ popstack(stack);
+ popstack(stack);
+ stack.push_back(fSuccess ? vchTrue : vchFalse);
+ if (opcode == OP_CHECKSIGVERIFY) {
+ if (fSuccess)
+ popstack(stack);
+ else
+ return set_error(serror,
+ SCRIPT_ERR_CHECKSIGVERIFY);
+ }
+ } break;
+
+ case OP_CHECKMULTISIG:
+ case OP_CHECKMULTISIGVERIFY: {
+ // ([sig ...] num_of_signatures [pubkey ...]
+ // num_of_pubkeys -- bool)
+
+ int i = 1;
+ if ((int)stack.size() < i)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+
+ int nKeysCount =
+ CScriptNum(stacktop(-i), fRequireMinimal).getint();
+ if (nKeysCount < 0 ||
+ nKeysCount > MAX_PUBKEYS_PER_MULTISIG)
+ return set_error(serror, SCRIPT_ERR_PUBKEY_COUNT);
+ nOpCount += nKeysCount;
+ if (nOpCount > MAX_OPS_PER_SCRIPT)
+ return set_error(serror, SCRIPT_ERR_OP_COUNT);
+ int ikey = ++i;
+ // ikey2 is the position of last non-signature item in
+ // the stack. Top stack item = 1. With
+ // SCRIPT_VERIFY_NULLFAIL, this is used for cleanup if
+ // operation fails.
+ int ikey2 = nKeysCount + 2;
+ i += nKeysCount;
+ if ((int)stack.size() < i)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+
+ int nSigsCount =
+ CScriptNum(stacktop(-i), fRequireMinimal).getint();
+ if (nSigsCount < 0 || nSigsCount > nKeysCount)
+ return set_error(serror, SCRIPT_ERR_SIG_COUNT);
+ int isig = ++i;
+ i += nSigsCount;
+ if ((int)stack.size() < i)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+
+ // Subset of script starting at the most recent
+ // codeseparator
+ CScript scriptCode(pbegincodehash, pend);
+
+ // Drop the signature in pre-segwit scripts but not
+ // segwit scripts
+ for (int k = 0; k < nSigsCount; k++) {
+ valtype &vchSig = stacktop(-isig - k);
+ if (sigversion == SIGVERSION_BASE) {
+ scriptCode.FindAndDelete(CScript(vchSig));
+ }
}
- ikey++;
- nKeysCount--;
-
- // If there are more signatures left than keys left,
- // then too many signatures have failed. Exit early,
- // without checking any further signatures.
- if (nSigsCount > nKeysCount)
- fSuccess = false;
- }
- // Clean up stack of actual arguments
- while (i-- > 1) {
- // If the operation failed, we require that all signatures must be empty vector
- if (!fSuccess && (flags & SCRIPT_VERIFY_NULLFAIL) && !ikey2 && stacktop(-1).size())
- return set_error(serror, SCRIPT_ERR_SIG_NULLFAIL);
- if (ikey2 > 0)
- ikey2--;
- popstack(stack);
- }
+ bool fSuccess = true;
+ while (fSuccess && nSigsCount > 0) {
+ valtype &vchSig = stacktop(-isig);
+ valtype &vchPubKey = stacktop(-ikey);
+
+ // Note how this makes the exact order of
+ // pubkey/signature evaluation distinguishable by
+ // CHECKMULTISIG NOT if the STRICTENC flag is set.
+ // See the script_(in)valid tests for details.
+ if (!CheckSignatureEncoding(vchSig, flags,
+ serror) ||
+ !CheckPubKeyEncoding(vchPubKey, flags,
+ sigversion, serror)) {
+ // serror is set
+ return false;
+ }
+
+ // Check signature
+ bool fOk = checker.CheckSig(vchSig, vchPubKey,
+ scriptCode, sigversion);
+
+ if (fOk) {
+ isig++;
+ nSigsCount--;
+ }
+ ikey++;
+ nKeysCount--;
+
+ // If there are more signatures left than keys left,
+ // then too many signatures have failed. Exit early,
+ // without checking any further signatures.
+ if (nSigsCount > nKeysCount) fSuccess = false;
+ }
- // A bug causes CHECKMULTISIG to consume one extra argument
- // whose contents were not checked in any way.
- //
- // Unfortunately this is a potential source of mutability,
- // so optionally verify it is exactly equal to zero prior
- // to removing it from the stack.
- if (stack.size() < 1)
- return set_error(serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
- if ((flags & SCRIPT_VERIFY_NULLDUMMY) && stacktop(-1).size())
- return set_error(serror, SCRIPT_ERR_SIG_NULLDUMMY);
- popstack(stack);
-
- stack.push_back(fSuccess ? vchTrue : vchFalse);
-
- if (opcode == OP_CHECKMULTISIGVERIFY)
- {
- if (fSuccess)
+ // Clean up stack of actual arguments
+ while (i-- > 1) {
+ // If the operation failed, we require that all
+ // signatures must be empty vector
+ if (!fSuccess && (flags & SCRIPT_VERIFY_NULLFAIL) &&
+ !ikey2 && stacktop(-1).size())
+ return set_error(serror,
+ SCRIPT_ERR_SIG_NULLFAIL);
+ if (ikey2 > 0) ikey2--;
popstack(stack);
- else
- return set_error(serror, SCRIPT_ERR_CHECKMULTISIGVERIFY);
- }
- }
- break;
+ }
- default:
- return set_error(serror, SCRIPT_ERR_BAD_OPCODE);
- }
+ // A bug causes CHECKMULTISIG to consume one extra
+ // argument whose contents were not checked in any way.
+ //
+ // Unfortunately this is a potential source of
+ // mutability, so optionally verify it is exactly equal
+ // to zero prior to removing it from the stack.
+ if (stack.size() < 1)
+ return set_error(
+ serror, SCRIPT_ERR_INVALID_STACK_OPERATION);
+ if ((flags & SCRIPT_VERIFY_NULLDUMMY) &&
+ stacktop(-1).size())
+ return set_error(serror, SCRIPT_ERR_SIG_NULLDUMMY);
+ popstack(stack);
+
+ stack.push_back(fSuccess ? vchTrue : vchFalse);
+
+ if (opcode == OP_CHECKMULTISIGVERIFY) {
+ if (fSuccess)
+ popstack(stack);
+ else
+ return set_error(
+ serror, SCRIPT_ERR_CHECKMULTISIGVERIFY);
+ }
+ } break;
+
+ default:
+ return set_error(serror, SCRIPT_ERR_BAD_OPCODE);
+ }
// Size limits
if (stack.size() + altstack.size() > 1000)
return set_error(serror, SCRIPT_ERR_STACK_SIZE);
}
- }
- catch (...)
- {
+ } catch (...) {
return set_error(serror, SCRIPT_ERR_UNKNOWN_ERROR);
}
if (!vfExec.empty())
return set_error(serror, SCRIPT_ERR_UNBALANCED_CONDITIONAL);
return set_success(serror);
}
namespace {
/**
* Wrapper that serializes like CTransaction, but with the modifications
* required for the signature hash done in-place
*/
class CTransactionSignatureSerializer {
private:
- const CTransaction& txTo; //!< reference to the spending transaction (the one being serialized)
- const CScript& scriptCode; //!< output script being consumed
- const unsigned int nIn; //!< input index of txTo being signed
- const bool fAnyoneCanPay; //!< whether the hashtype has the SIGHASH_ANYONECANPAY flag set
- const bool fHashSingle; //!< whether the hashtype is SIGHASH_SINGLE
- const bool fHashNone; //!< whether the hashtype is SIGHASH_NONE
+ //!< reference to the spending transaction (the one being serialized)
+ const CTransaction &txTo;
+ //!< output script being consumed
+ const CScript &scriptCode;
+ //!< input index of txTo being signed
+ const unsigned int nIn;
+ //!< whether the hashtype has the SIGHASH_ANYONECANPAY flag set
+ const bool fAnyoneCanPay;
+ //!< whether the hashtype is SIGHASH_SINGLE
+ const bool fHashSingle;
+ //!< whether the hashtype is SIGHASH_NONE
+ const bool fHashNone;
public:
- CTransactionSignatureSerializer(const CTransaction &txToIn, const CScript &scriptCodeIn, unsigned int nInIn, int nHashTypeIn) :
- txTo(txToIn), scriptCode(scriptCodeIn), nIn(nInIn),
- fAnyoneCanPay(!!(nHashTypeIn & SIGHASH_ANYONECANPAY)),
- fHashSingle((nHashTypeIn & 0x1f) == SIGHASH_SINGLE),
- fHashNone((nHashTypeIn & 0x1f) == SIGHASH_NONE) {}
+ CTransactionSignatureSerializer(const CTransaction &txToIn,
+ const CScript &scriptCodeIn,
+ unsigned int nInIn, int nHashTypeIn)
+ : txTo(txToIn), scriptCode(scriptCodeIn), nIn(nInIn),
+ fAnyoneCanPay(!!(nHashTypeIn & SIGHASH_ANYONECANPAY)),
+ fHashSingle((nHashTypeIn & 0x1f) == SIGHASH_SINGLE),
+ fHashNone((nHashTypeIn & 0x1f) == SIGHASH_NONE) {}
/** Serialize the passed scriptCode, skipping OP_CODESEPARATORs */
- template<typename S>
- void SerializeScriptCode(S &s) const {
+ template <typename S> void SerializeScriptCode(S &s) const {
CScript::const_iterator it = scriptCode.begin();
CScript::const_iterator itBegin = it;
opcodetype opcode;
unsigned int nCodeSeparators = 0;
while (scriptCode.GetOp(it, opcode)) {
- if (opcode == OP_CODESEPARATOR)
- nCodeSeparators++;
+ if (opcode == OP_CODESEPARATOR) nCodeSeparators++;
}
::WriteCompactSize(s, scriptCode.size() - nCodeSeparators);
it = itBegin;
while (scriptCode.GetOp(it, opcode)) {
if (opcode == OP_CODESEPARATOR) {
- s.write((char*)&itBegin[0], it-itBegin-1);
+ s.write((char *)&itBegin[0], it - itBegin - 1);
itBegin = it;
}
}
if (itBegin != scriptCode.end())
- s.write((char*)&itBegin[0], it-itBegin);
+ s.write((char *)&itBegin[0], it - itBegin);
}
/** Serialize an input of txTo */
- template<typename S>
- void SerializeInput(S &s, unsigned int nInput) const {
- // In case of SIGHASH_ANYONECANPAY, only the input being signed is serialized
- if (fAnyoneCanPay)
- nInput = nIn;
+ template <typename S> void SerializeInput(S &s, unsigned int nInput) const {
+ // In case of SIGHASH_ANYONECANPAY, only the input being signed is
+ // serialized
+ if (fAnyoneCanPay) nInput = nIn;
// Serialize the prevout
::Serialize(s, txTo.vin[nInput].prevout);
// Serialize the script
if (nInput != nIn)
// Blank out other inputs' signatures
::Serialize(s, CScriptBase());
else
SerializeScriptCode(s);
// Serialize the nSequence
if (nInput != nIn && (fHashSingle || fHashNone))
// let the others update at will
::Serialize(s, (int)0);
else
::Serialize(s, txTo.vin[nInput].nSequence);
}
/** Serialize an output of txTo */
- template<typename S>
+ template <typename S>
void SerializeOutput(S &s, unsigned int nOutput) const {
if (fHashSingle && nOutput != nIn)
// Do not lock-in the txout payee at other indices as txin
::Serialize(s, CTxOut());
else
::Serialize(s, txTo.vout[nOutput]);
}
/** Serialize txTo */
- template<typename S>
- void Serialize(S &s) const {
+ template <typename S> void Serialize(S &s) const {
// Serialize nVersion
::Serialize(s, txTo.nVersion);
// Serialize vin
unsigned int nInputs = fAnyoneCanPay ? 1 : txTo.vin.size();
::WriteCompactSize(s, nInputs);
for (unsigned int nInput = 0; nInput < nInputs; nInput++)
- SerializeInput(s, nInput);
+ SerializeInput(s, nInput);
// Serialize vout
- unsigned int nOutputs = fHashNone ? 0 : (fHashSingle ? nIn+1 : txTo.vout.size());
+ unsigned int nOutputs =
+ fHashNone ? 0 : (fHashSingle ? nIn + 1 : txTo.vout.size());
::WriteCompactSize(s, nOutputs);
for (unsigned int nOutput = 0; nOutput < nOutputs; nOutput++)
- SerializeOutput(s, nOutput);
+ SerializeOutput(s, nOutput);
// Serialize nLockTime
::Serialize(s, txTo.nLockTime);
}
};
-uint256 GetPrevoutHash(const CTransaction& txTo) {
+uint256 GetPrevoutHash(const CTransaction &txTo) {
CHashWriter ss(SER_GETHASH, 0);
for (unsigned int n = 0; n < txTo.vin.size(); n++) {
ss << txTo.vin[n].prevout;
}
return ss.GetHash();
}
-uint256 GetSequenceHash(const CTransaction& txTo) {
+uint256 GetSequenceHash(const CTransaction &txTo) {
CHashWriter ss(SER_GETHASH, 0);
for (unsigned int n = 0; n < txTo.vin.size(); n++) {
ss << txTo.vin[n].nSequence;
}
return ss.GetHash();
}
-uint256 GetOutputsHash(const CTransaction& txTo) {
+uint256 GetOutputsHash(const CTransaction &txTo) {
CHashWriter ss(SER_GETHASH, 0);
for (unsigned int n = 0; n < txTo.vout.size(); n++) {
ss << txTo.vout[n];
}
return ss.GetHash();
}
} // anon namespace
-PrecomputedTransactionData::PrecomputedTransactionData(const CTransaction& txTo)
-{
+PrecomputedTransactionData::PrecomputedTransactionData(
+ const CTransaction &txTo) {
hashPrevouts = GetPrevoutHash(txTo);
hashSequence = GetSequenceHash(txTo);
hashOutputs = GetOutputsHash(txTo);
}
-uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache)
-{
+uint256 SignatureHash(const CScript &scriptCode, const CTransaction &txTo,
+ unsigned int nIn, int nHashType, const CAmount &amount,
+ SigVersion sigversion,
+ const PrecomputedTransactionData *cache) {
if (sigversion == SIGVERSION_WITNESS_V0) {
uint256 hashPrevouts;
uint256 hashSequence;
uint256 hashOutputs;
if (!(nHashType & SIGHASH_ANYONECANPAY)) {
hashPrevouts = cache ? cache->hashPrevouts : GetPrevoutHash(txTo);
}
- if (!(nHashType & SIGHASH_ANYONECANPAY) && (nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
+ if (!(nHashType & SIGHASH_ANYONECANPAY) &&
+ (nHashType & 0x1f) != SIGHASH_SINGLE &&
+ (nHashType & 0x1f) != SIGHASH_NONE) {
hashSequence = cache ? cache->hashSequence : GetSequenceHash(txTo);
}
-
- if ((nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
+ if ((nHashType & 0x1f) != SIGHASH_SINGLE &&
+ (nHashType & 0x1f) != SIGHASH_NONE) {
hashOutputs = cache ? cache->hashOutputs : GetOutputsHash(txTo);
- } else if ((nHashType & 0x1f) == SIGHASH_SINGLE && nIn < txTo.vout.size()) {
+ } else if ((nHashType & 0x1f) == SIGHASH_SINGLE &&
+ nIn < txTo.vout.size()) {
CHashWriter ss(SER_GETHASH, 0);
ss << txTo.vout[nIn];
hashOutputs = ss.GetHash();
}
CHashWriter ss(SER_GETHASH, 0);
// Version
ss << txTo.nVersion;
// Input prevouts/nSequence (none/all, depending on flags)
ss << hashPrevouts;
ss << hashSequence;
- // The input being signed (replacing the scriptSig with scriptCode + amount)
- // The prevout may already be contained in hashPrevout, and the nSequence
- // may already be contain in hashSequence.
+ // The input being signed (replacing the scriptSig with scriptCode +
+ // amount). The prevout may already be contained in hashPrevout, and the
+ // nSequence may already be contain in hashSequence.
ss << txTo.vin[nIn].prevout;
- ss << static_cast<const CScriptBase&>(scriptCode);
+ ss << static_cast<const CScriptBase &>(scriptCode);
ss << amount;
ss << txTo.vin[nIn].nSequence;
// Outputs (none/one/all, depending on flags)
ss << hashOutputs;
// Locktime
ss << txTo.nLockTime;
// Sighash type
ss << nHashType;
return ss.GetHash();
}
- static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
+ static const uint256 one(uint256S(
+ "0000000000000000000000000000000000000000000000000000000000000001"));
if (nIn >= txTo.vin.size()) {
// nIn out of range
return one;
}
// Check for invalid use of SIGHASH_SINGLE
if ((nHashType & 0x1f) == SIGHASH_SINGLE) {
if (nIn >= txTo.vout.size()) {
// nOut out of range
return one;
}
}
- // Wrapper to serialize only the necessary parts of the transaction being signed
+ // Wrapper to serialize only the necessary parts of the transaction being
+ // signed
CTransactionSignatureSerializer txTmp(txTo, scriptCode, nIn, nHashType);
// Serialize and hash
CHashWriter ss(SER_GETHASH, 0);
ss << txTmp << nHashType;
return ss.GetHash();
}
-bool TransactionSignatureChecker::VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& pubkey, const uint256& sighash) const
-{
+bool TransactionSignatureChecker::VerifySignature(
+ const std::vector<unsigned char> &vchSig, const CPubKey &pubkey,
+ const uint256 &sighash) const {
return pubkey.Verify(sighash, vchSig);
}
-bool TransactionSignatureChecker::CheckSig(const vector<unsigned char>& vchSigIn, const vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const
-{
+bool TransactionSignatureChecker::CheckSig(
+ const vector<unsigned char> &vchSigIn,
+ const vector<unsigned char> &vchPubKey, const CScript &scriptCode,
+ SigVersion sigversion) const {
CPubKey pubkey(vchPubKey);
- if (!pubkey.IsValid())
- return false;
+ if (!pubkey.IsValid()) return false;
// Hash type is one byte tacked on to the end of the signature
vector<unsigned char> vchSig(vchSigIn);
- if (vchSig.empty())
- return false;
+ if (vchSig.empty()) return false;
int nHashType = vchSig.back();
vchSig.pop_back();
- uint256 sighash = SignatureHash(scriptCode, *txTo, nIn, nHashType, amount, sigversion, this->txdata);
+ uint256 sighash = SignatureHash(scriptCode, *txTo, nIn, nHashType, amount,
+ sigversion, this->txdata);
- if (!VerifySignature(vchSig, pubkey, sighash))
- return false;
+ if (!VerifySignature(vchSig, pubkey, sighash)) return false;
return true;
}
-bool TransactionSignatureChecker::CheckLockTime(const CScriptNum& nLockTime) const
-{
- // There are two kinds of nLockTime: lock-by-blockheight
- // and lock-by-blocktime, distinguished by whether
- // nLockTime < LOCKTIME_THRESHOLD.
+bool TransactionSignatureChecker::CheckLockTime(
+ const CScriptNum &nLockTime) const {
+ // There are two kinds of nLockTime: lock-by-blockheight and
+ // lock-by-blocktime, distinguished by whether nLockTime <
+ // LOCKTIME_THRESHOLD.
//
- // We want to compare apples to apples, so fail the script
- // unless the type of nLockTime being tested is the same as
- // the nLockTime in the transaction.
- if (!(
- (txTo->nLockTime < LOCKTIME_THRESHOLD && nLockTime < LOCKTIME_THRESHOLD) ||
- (txTo->nLockTime >= LOCKTIME_THRESHOLD && nLockTime >= LOCKTIME_THRESHOLD)
- ))
+ // We want to compare apples to apples, so fail the script unless the type
+ // of nLockTime being tested is the same as the nLockTime in the
+ // transaction.
+ if (!((txTo->nLockTime < LOCKTIME_THRESHOLD &&
+ nLockTime < LOCKTIME_THRESHOLD) ||
+ (txTo->nLockTime >= LOCKTIME_THRESHOLD &&
+ nLockTime >= LOCKTIME_THRESHOLD)))
return false;
- // Now that we know we're comparing apples-to-apples, the
- // comparison is a simple numeric one.
- if (nLockTime > (int64_t)txTo->nLockTime)
- return false;
+ // Now that we know we're comparing apples-to-apples, the comparison is a
+ // simple numeric one.
+ if (nLockTime > (int64_t)txTo->nLockTime) return false;
// Finally the nLockTime feature can be disabled and thus
- // CHECKLOCKTIMEVERIFY bypassed if every txin has been
- // finalized by setting nSequence to maxint. The
- // transaction would be allowed into the blockchain, making
- // the opcode ineffective.
+ // CHECKLOCKTIMEVERIFY bypassed if every txin has been finalized by setting
+ // nSequence to maxint. The transaction would be allowed into the
+ // blockchain, making the opcode ineffective.
//
- // Testing if this vin is not final is sufficient to
- // prevent this condition. Alternatively we could test all
- // inputs, but testing just this input minimizes the data
- // required to prove correct CHECKLOCKTIMEVERIFY execution.
- if (CTxIn::SEQUENCE_FINAL == txTo->vin[nIn].nSequence)
- return false;
+ // Testing if this vin is not final is sufficient to prevent this condition.
+ // Alternatively we could test all inputs, but testing just this input
+ // minimizes the data required to prove correct CHECKLOCKTIMEVERIFY
+ // execution.
+ if (CTxIn::SEQUENCE_FINAL == txTo->vin[nIn].nSequence) return false;
return true;
}
-bool TransactionSignatureChecker::CheckSequence(const CScriptNum& nSequence) const
-{
- // Relative lock times are supported by comparing the passed
- // in operand to the sequence number of the input.
+bool TransactionSignatureChecker::CheckSequence(
+ const CScriptNum &nSequence) const {
+ // Relative lock times are supported by comparing the passed in operand to
+ // the sequence number of the input.
const int64_t txToSequence = (int64_t)txTo->vin[nIn].nSequence;
- // Fail if the transaction's version number is not set high
- // enough to trigger BIP 68 rules.
- if (static_cast<uint32_t>(txTo->nVersion) < 2)
- return false;
+ // Fail if the transaction's version number is not set high enough to
+ // trigger BIP 68 rules.
+ if (static_cast<uint32_t>(txTo->nVersion) < 2) return false;
- // Sequence numbers with their most significant bit set are not
- // consensus constrained. Testing that the transaction's sequence
- // number do not have this bit set prevents using this property
- // to get around a CHECKSEQUENCEVERIFY check.
- if (txToSequence & CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG)
- return false;
+ // Sequence numbers with their most significant bit set are not consensus
+ // constrained. Testing that the transaction's sequence number do not have
+ // this bit set prevents using this property to get around a
+ // CHECKSEQUENCEVERIFY check.
+ if (txToSequence & CTxIn::SEQUENCE_LOCKTIME_DISABLE_FLAG) return false;
- // Mask off any bits that do not have consensus-enforced meaning
- // before doing the integer comparisons
- const uint32_t nLockTimeMask = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG | CTxIn::SEQUENCE_LOCKTIME_MASK;
+ // Mask off any bits that do not have consensus-enforced meaning before
+ // doing the integer comparisons
+ const uint32_t nLockTimeMask =
+ CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG | CTxIn::SEQUENCE_LOCKTIME_MASK;
const int64_t txToSequenceMasked = txToSequence & nLockTimeMask;
const CScriptNum nSequenceMasked = nSequence & nLockTimeMask;
- // There are two kinds of nSequence: lock-by-blockheight
- // and lock-by-blocktime, distinguished by whether
- // nSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG.
+ // There are two kinds of nSequence: lock-by-blockheight and
+ // lock-by-blocktime, distinguished by whether nSequenceMasked <
+ // CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG.
//
- // We want to compare apples to apples, so fail the script
- // unless the type of nSequenceMasked being tested is the same as
- // the nSequenceMasked in the transaction.
- if (!(
- (txToSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG && nSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG) ||
- (txToSequenceMasked >= CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG && nSequenceMasked >= CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG)
- )) {
+ // We want to compare apples to apples, so fail the script unless the type
+ // of nSequenceMasked being tested is the same as the nSequenceMasked in the
+ // transaction.
+ if (!((txToSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG &&
+ nSequenceMasked < CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG) ||
+ (txToSequenceMasked >= CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG &&
+ nSequenceMasked >= CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG))) {
return false;
}
- // Now that we know we're comparing apples-to-apples, the
- // comparison is a simple numeric one.
- if (nSequenceMasked > txToSequenceMasked)
- return false;
+ // Now that we know we're comparing apples-to-apples, the comparison is a
+ // simple numeric one.
+ if (nSequenceMasked > txToSequenceMasked) return false;
return true;
}
-static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion, const std::vector<unsigned char>& program, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror)
-{
- vector<vector<unsigned char> > stack;
+static bool VerifyWitnessProgram(const CScriptWitness &witness, int witversion,
+ const std::vector<unsigned char> &program,
+ unsigned int flags,
+ const BaseSignatureChecker &checker,
+ ScriptError *serror) {
+ vector<vector<unsigned char>> stack;
CScript scriptPubKey;
if (witversion == 0) {
if (program.size() == 32) {
- // Version 0 segregated witness program: SHA256(CScript) inside the program, CScript + inputs in witness
+ // Version 0 segregated witness program: SHA256(CScript) inside the
+ // program, CScript + inputs in witness
if (witness.stack.size() == 0) {
- return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_WITNESS_EMPTY);
+ return set_error(serror,
+ SCRIPT_ERR_WITNESS_PROGRAM_WITNESS_EMPTY);
}
- scriptPubKey = CScript(witness.stack.back().begin(), witness.stack.back().end());
- stack = std::vector<std::vector<unsigned char> >(witness.stack.begin(), witness.stack.end() - 1);
+ scriptPubKey = CScript(witness.stack.back().begin(),
+ witness.stack.back().end());
+ stack = std::vector<std::vector<unsigned char>>(
+ witness.stack.begin(), witness.stack.end() - 1);
uint256 hashScriptPubKey;
- CSHA256().Write(&scriptPubKey[0], scriptPubKey.size()).Finalize(hashScriptPubKey.begin());
+ CSHA256()
+ .Write(&scriptPubKey[0], scriptPubKey.size())
+ .Finalize(hashScriptPubKey.begin());
if (memcmp(hashScriptPubKey.begin(), &program[0], 32)) {
return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH);
}
} else if (program.size() == 20) {
// Special case for pay-to-pubkeyhash; signature + pubkey in witness
if (witness.stack.size() != 2) {
- return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH); // 2 items in witness
+ return set_error(
+ serror,
+ SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH); // 2 items in witness
}
- scriptPubKey << OP_DUP << OP_HASH160 << program << OP_EQUALVERIFY << OP_CHECKSIG;
+ scriptPubKey << OP_DUP << OP_HASH160 << program << OP_EQUALVERIFY
+ << OP_CHECKSIG;
stack = witness.stack;
} else {
return set_error(serror, SCRIPT_ERR_WITNESS_PROGRAM_WRONG_LENGTH);
}
} else if (flags & SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM) {
- return set_error(serror, SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM);
+ return set_error(serror,
+ SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM);
} else {
- // Higher version witness scripts return true for future softfork compatibility
+ // Higher version witness scripts return true for future softfork
+ // compatibility
return set_success(serror);
}
// Disallow stack item size > MAX_SCRIPT_ELEMENT_SIZE in witness stack
for (unsigned int i = 0; i < stack.size(); i++) {
if (stack.at(i).size() > MAX_SCRIPT_ELEMENT_SIZE)
return set_error(serror, SCRIPT_ERR_PUSH_SIZE);
}
- if (!EvalScript(stack, scriptPubKey, flags, checker, SIGVERSION_WITNESS_V0, serror)) {
+ if (!EvalScript(stack, scriptPubKey, flags, checker, SIGVERSION_WITNESS_V0,
+ serror)) {
return false;
}
// Scripts inside witness implicitly require cleanstack behaviour
- if (stack.size() != 1)
- return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
+ if (stack.size() != 1) return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
if (!CastToBool(stack.back()))
return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
return true;
}
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror)
-{
+bool VerifyScript(const CScript &scriptSig, const CScript &scriptPubKey,
+ unsigned int flags, const BaseSignatureChecker &checker,
+ ScriptError *serror) {
static const CScriptWitness emptyWitness;
- const CScriptWitness* witness = &emptyWitness;
+ const CScriptWitness *witness = &emptyWitness;
bool hadWitness = false;
set_error(serror, SCRIPT_ERR_UNKNOWN_ERROR);
if ((flags & SCRIPT_VERIFY_SIGPUSHONLY) != 0 && !scriptSig.IsPushOnly()) {
return set_error(serror, SCRIPT_ERR_SIG_PUSHONLY);
}
- vector<vector<unsigned char> > stack, stackCopy;
+ vector<vector<unsigned char>> stack, stackCopy;
if (!EvalScript(stack, scriptSig, flags, checker, SIGVERSION_BASE, serror))
// serror is set
return false;
- if (flags & SCRIPT_VERIFY_P2SH)
- stackCopy = stack;
- if (!EvalScript(stack, scriptPubKey, flags, checker, SIGVERSION_BASE, serror))
+ if (flags & SCRIPT_VERIFY_P2SH) stackCopy = stack;
+ if (!EvalScript(stack, scriptPubKey, flags, checker, SIGVERSION_BASE,
+ serror))
// serror is set
return false;
- if (stack.empty())
- return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
+ if (stack.empty()) return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
if (CastToBool(stack.back()) == false)
return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
// Bare witness programs
int witnessversion;
std::vector<unsigned char> witnessprogram;
if (flags & SCRIPT_VERIFY_WITNESS) {
if (scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram)) {
hadWitness = true;
if (scriptSig.size() != 0) {
- // The scriptSig must be _exactly_ CScript(), otherwise we reintroduce malleability.
+ // The scriptSig must be _exactly_ CScript(), otherwise we
+ // reintroduce malleability.
return set_error(serror, SCRIPT_ERR_WITNESS_MALLEATED);
}
- if (!VerifyWitnessProgram(*witness, witnessversion, witnessprogram, flags, checker, serror)) {
+ if (!VerifyWitnessProgram(*witness, witnessversion, witnessprogram,
+ flags, checker, serror)) {
return false;
}
- // Bypass the cleanstack check at the end. The actual stack is obviously not clean
- // for witness programs.
+ // Bypass the cleanstack check at the end. The actual stack is
+ // obviously not clean for witness programs.
stack.resize(1);
}
}
// Additional validation for spend-to-script-hash transactions:
- if ((flags & SCRIPT_VERIFY_P2SH) && scriptPubKey.IsPayToScriptHash())
- {
+ if ((flags & SCRIPT_VERIFY_P2SH) && scriptPubKey.IsPayToScriptHash()) {
// scriptSig must be literals-only or validation fails
if (!scriptSig.IsPushOnly())
return set_error(serror, SCRIPT_ERR_SIG_PUSHONLY);
// Restore stack.
swap(stack, stackCopy);
- // stack cannot be empty here, because if it was the
- // P2SH HASH <> EQUAL scriptPubKey would be evaluated with
- // an empty stack and the EvalScript above would return false.
+ // stack cannot be empty here, because if it was the P2SH HASH <> EQUAL
+ // scriptPubKey would be evaluated with an empty stack and the
+ // EvalScript above would return false.
assert(!stack.empty());
- const valtype& pubKeySerialized = stack.back();
+ const valtype &pubKeySerialized = stack.back();
CScript pubKey2(pubKeySerialized.begin(), pubKeySerialized.end());
popstack(stack);
- if (!EvalScript(stack, pubKey2, flags, checker, SIGVERSION_BASE, serror))
+ if (!EvalScript(stack, pubKey2, flags, checker, SIGVERSION_BASE,
+ serror))
// serror is set
return false;
- if (stack.empty())
- return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
+ if (stack.empty()) return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
if (!CastToBool(stack.back()))
return set_error(serror, SCRIPT_ERR_EVAL_FALSE);
// P2SH witness program
if (flags & SCRIPT_VERIFY_WITNESS) {
if (pubKey2.IsWitnessProgram(witnessversion, witnessprogram)) {
hadWitness = true;
- if (scriptSig != CScript() << std::vector<unsigned char>(pubKey2.begin(), pubKey2.end())) {
- // The scriptSig must be _exactly_ a single push of the redeemScript. Otherwise we
- // reintroduce malleability.
+ if (scriptSig !=
+ CScript() << std::vector<unsigned char>(pubKey2.begin(),
+ pubKey2.end())) {
+ // The scriptSig must be _exactly_ a single push of the
+ // redeemScript. Otherwise we reintroduce malleability.
return set_error(serror, SCRIPT_ERR_WITNESS_MALLEATED_P2SH);
}
- if (!VerifyWitnessProgram(*witness, witnessversion, witnessprogram, flags, checker, serror)) {
+ if (!VerifyWitnessProgram(*witness, witnessversion,
+ witnessprogram, flags, checker,
+ serror)) {
return false;
}
- // Bypass the cleanstack check at the end. The actual stack is obviously not clean
- // for witness programs.
+ // Bypass the cleanstack check at the end. The actual stack is
+ // obviously not clean for witness programs.
stack.resize(1);
}
}
}
// The CLEANSTACK check is only performed after potential P2SH evaluation,
// as the non-P2SH evaluation of a P2SH script will obviously not result in
- // a clean stack (the P2SH inputs remain). The same holds for witness evaluation.
+ // a clean stack (the P2SH inputs remain). The same holds for witness
+ // evaluation.
if ((flags & SCRIPT_VERIFY_CLEANSTACK) != 0) {
- // Disallow CLEANSTACK without P2SH, as otherwise a switch CLEANSTACK->P2SH+CLEANSTACK
- // would be possible, which is not a softfork (and P2SH should be one).
+ // Disallow CLEANSTACK without P2SH, as otherwise a switch
+ // CLEANSTACK->P2SH+CLEANSTACK would be possible, which is not a
+ // softfork (and P2SH should be one).
assert((flags & SCRIPT_VERIFY_P2SH) != 0);
assert((flags & SCRIPT_VERIFY_WITNESS) != 0);
if (stack.size() != 1) {
return set_error(serror, SCRIPT_ERR_CLEANSTACK);
}
}
if (flags & SCRIPT_VERIFY_WITNESS) {
- // We can't check for correct unexpected witness data if P2SH was off, so require
- // that WITNESS implies P2SH. Otherwise, going from WITNESS->P2SH+WITNESS would be
- // possible, which is not a softfork.
+ // We can't check for correct unexpected witness data if P2SH was off,
+ // so require that WITNESS implies P2SH. Otherwise, going from
+ // WITNESS->P2SH+WITNESS would be possible, which is not a softfork.
assert((flags & SCRIPT_VERIFY_P2SH) != 0);
if (!hadWitness && !witness->IsNull()) {
return set_error(serror, SCRIPT_ERR_WITNESS_UNEXPECTED);
}
}
return set_success(serror);
}
diff --git a/src/script/interpreter.h b/src/script/interpreter.h
index 7eaeb4d92..25e2b9162 100644
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -1,180 +1,205 @@
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_SCRIPT_INTERPRETER_H
#define BITCOIN_SCRIPT_INTERPRETER_H
-#include "script_error.h"
#include "primitives/transaction.h"
+#include "script_error.h"
-#include <vector>
#include <stdint.h>
#include <string>
+#include <vector>
class CPubKey;
class CScript;
class CTransaction;
class uint256;
/** Signature hash types/flags */
-enum
-{
+enum {
SIGHASH_ALL = 1,
SIGHASH_NONE = 2,
SIGHASH_SINGLE = 3,
SIGHASH_ANYONECANPAY = 0x80,
};
/** Script verification flags */
-enum
-{
- SCRIPT_VERIFY_NONE = 0,
+enum {
+ SCRIPT_VERIFY_NONE = 0,
// Evaluate P2SH subscripts (softfork safe, BIP16).
- SCRIPT_VERIFY_P2SH = (1U << 0),
+ SCRIPT_VERIFY_P2SH = (1U << 0),
- // Passing a non-strict-DER signature or one with undefined hashtype to a checksig operation causes script failure.
- // Evaluating a pubkey that is not (0x04 + 64 bytes) or (0x02 or 0x03 + 32 bytes) by checksig causes script failure.
+ // Passing a non-strict-DER signature or one with undefined hashtype to a
+ // checksig operation causes script failure. Evaluating a pubkey that is not
+ // (0x04 + 64 bytes) or (0x02 or 0x03 + 32 bytes) by checksig causes script
+ // failure.
// (softfork safe, but not used or intended as a consensus rule).
SCRIPT_VERIFY_STRICTENC = (1U << 1),
- // Passing a non-strict-DER signature to a checksig operation causes script failure (softfork safe, BIP62 rule 1)
- SCRIPT_VERIFY_DERSIG = (1U << 2),
+ // Passing a non-strict-DER signature to a checksig operation causes script
+ // failure (softfork safe, BIP62 rule 1)
+ SCRIPT_VERIFY_DERSIG = (1U << 2),
- // Passing a non-strict-DER signature or one with S > order/2 to a checksig operation causes script failure
+ // Passing a non-strict-DER signature or one with S > order/2 to a checksig
+ // operation causes script failure
// (softfork safe, BIP62 rule 5).
- SCRIPT_VERIFY_LOW_S = (1U << 3),
+ SCRIPT_VERIFY_LOW_S = (1U << 3),
- // verify dummy stack item consumed by CHECKMULTISIG is of zero-length (softfork safe, BIP62 rule 7).
+ // verify dummy stack item consumed by CHECKMULTISIG is of zero-length
+ // (softfork safe, BIP62 rule 7).
SCRIPT_VERIFY_NULLDUMMY = (1U << 4),
- // Using a non-push operator in the scriptSig causes script failure (softfork safe, BIP62 rule 2).
+ // Using a non-push operator in the scriptSig causes script failure
+ // (softfork safe, BIP62 rule 2).
SCRIPT_VERIFY_SIGPUSHONLY = (1U << 5),
- // Require minimal encodings for all push operations (OP_0... OP_16, OP_1NEGATE where possible, direct
- // pushes up to 75 bytes, OP_PUSHDATA up to 255 bytes, OP_PUSHDATA2 for anything larger). Evaluating
- // any other push causes the script to fail (BIP62 rule 3).
- // In addition, whenever a stack element is interpreted as a number, it must be of minimal length (BIP62 rule 4).
+ // Require minimal encodings for all push operations (OP_0... OP_16,
+ // OP_1NEGATE where possible, direct pushes up to 75 bytes, OP_PUSHDATA up
+ // to 255 bytes, OP_PUSHDATA2 for anything larger). Evaluating any other
+ // push causes the script to fail (BIP62 rule 3). In addition, whenever a
+ // stack element is interpreted as a number, it must be of minimal length
+ // (BIP62 rule 4).
// (softfork safe)
SCRIPT_VERIFY_MINIMALDATA = (1U << 6),
// Discourage use of NOPs reserved for upgrades (NOP1-10)
//
// Provided so that nodes can avoid accepting or mining transactions
// containing executed NOP's whose meaning may change after a soft-fork,
// thus rendering the script invalid; with this flag set executing
- // discouraged NOPs fails the script. This verification flag will never be
- // a mandatory flag applied to scripts in a block. NOPs that are not
- // executed, e.g. within an unexecuted IF ENDIF block, are *not* rejected.
- SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS = (1U << 7),
-
- // Require that only a single stack element remains after evaluation. This changes the success criterion from
- // "At least one stack element must remain, and when interpreted as a boolean, it must be true" to
- // "Exactly one stack element must remain, and when interpreted as a boolean, it must be true".
+ // discouraged NOPs fails the script. This verification flag will never be a
+ // mandatory flag applied to scripts in a block. NOPs that are not executed,
+ // e.g. within an unexecuted IF ENDIF block, are *not* rejected.
+ SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_NOPS = (1U << 7),
+
+ // Require that only a single stack element remains after evaluation. This
+ // changes the success criterion from "At least one stack element must
+ // remain, and when interpreted as a boolean, it must be true" to "Exactly
+ // one stack element must remain, and when interpreted as a boolean, it must
+ // be true".
// (softfork safe, BIP62 rule 6)
// Note: CLEANSTACK should never be used without P2SH or WITNESS.
SCRIPT_VERIFY_CLEANSTACK = (1U << 8),
// Verify CHECKLOCKTIMEVERIFY
//
// See BIP65 for details.
SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY = (1U << 9),
// support CHECKSEQUENCEVERIFY opcode
//
// See BIP112 for details
SCRIPT_VERIFY_CHECKSEQUENCEVERIFY = (1U << 10),
// Support segregated witness
//
SCRIPT_VERIFY_WITNESS = (1U << 11),
// Making v1-v16 witness program non-standard
//
SCRIPT_VERIFY_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM = (1U << 12),
- // Segwit script only: Require the argument of OP_IF/NOTIF to be exactly 0x01 or empty vector
+ // Segwit script only: Require the argument of OP_IF/NOTIF to be exactly
+ // 0x01 or empty vector
//
SCRIPT_VERIFY_MINIMALIF = (1U << 13),
// Signature(s) must be empty vector if an CHECK(MULTI)SIG operation failed
//
SCRIPT_VERIFY_NULLFAIL = (1U << 14),
// Public keys in segregated witness scripts must be compressed
//
SCRIPT_VERIFY_WITNESS_PUBKEYTYPE = (1U << 15),
};
-bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned int flags, ScriptError* serror);
+bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig,
+ unsigned int flags, ScriptError *serror);
-struct PrecomputedTransactionData
-{
+struct PrecomputedTransactionData {
uint256 hashPrevouts, hashSequence, hashOutputs;
- PrecomputedTransactionData(const CTransaction& tx);
+ PrecomputedTransactionData(const CTransaction &tx);
};
-enum SigVersion
-{
+enum SigVersion {
SIGVERSION_BASE = 0,
SIGVERSION_WITNESS_V0 = 1,
};
-uint256 SignatureHash(const CScript &scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = NULL);
+uint256 SignatureHash(const CScript &scriptCode, const CTransaction &txTo,
+ unsigned int nIn, int nHashType, const CAmount &amount,
+ SigVersion sigversion,
+ const PrecomputedTransactionData *cache = NULL);
-class BaseSignatureChecker
-{
+class BaseSignatureChecker {
public:
- virtual bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const
- {
+ virtual bool CheckSig(const std::vector<unsigned char> &scriptSig,
+ const std::vector<unsigned char> &vchPubKey,
+ const CScript &scriptCode,
+ SigVersion sigversion) const {
return false;
}
- virtual bool CheckLockTime(const CScriptNum& nLockTime) const
- {
- return false;
+ virtual bool CheckLockTime(const CScriptNum &nLockTime) const {
+ return false;
}
- virtual bool CheckSequence(const CScriptNum& nSequence) const
- {
- return false;
+ virtual bool CheckSequence(const CScriptNum &nSequence) const {
+ return false;
}
virtual ~BaseSignatureChecker() {}
};
-class TransactionSignatureChecker : public BaseSignatureChecker
-{
+class TransactionSignatureChecker : public BaseSignatureChecker {
private:
- const CTransaction* txTo;
+ const CTransaction *txTo;
unsigned int nIn;
const CAmount amount;
- const PrecomputedTransactionData* txdata;
+ const PrecomputedTransactionData *txdata;
protected:
- virtual bool VerifySignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;
+ virtual bool VerifySignature(const std::vector<unsigned char> &vchSig,
+ const CPubKey &vchPubKey,
+ const uint256 &sighash) const;
public:
- TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(NULL) {}
- TransactionSignatureChecker(const CTransaction* txToIn, unsigned int nInIn, const CAmount& amountIn, const PrecomputedTransactionData& txdataIn) : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(&txdataIn) {}
- bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const;
- bool CheckLockTime(const CScriptNum& nLockTime) const;
- bool CheckSequence(const CScriptNum& nSequence) const;
+ TransactionSignatureChecker(const CTransaction *txToIn, unsigned int nInIn,
+ const CAmount &amountIn)
+ : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(NULL) {}
+ TransactionSignatureChecker(const CTransaction *txToIn, unsigned int nInIn,
+ const CAmount &amountIn,
+ const PrecomputedTransactionData &txdataIn)
+ : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(&txdataIn) {}
+ bool CheckSig(const std::vector<unsigned char> &scriptSig,
+ const std::vector<unsigned char> &vchPubKey,
+ const CScript &scriptCode, SigVersion sigversion) const;
+ bool CheckLockTime(const CScriptNum &nLockTime) const;
+ bool CheckSequence(const CScriptNum &nSequence) const;
};
-class MutableTransactionSignatureChecker : public TransactionSignatureChecker
-{
+class MutableTransactionSignatureChecker : public TransactionSignatureChecker {
private:
const CTransaction txTo;
public:
- MutableTransactionSignatureChecker(const CMutableTransaction* txToIn, unsigned int nInIn, const CAmount& amount) : TransactionSignatureChecker(&txTo, nInIn, amount), txTo(*txToIn) {}
+ MutableTransactionSignatureChecker(const CMutableTransaction *txToIn,
+ unsigned int nInIn,
+ const CAmount &amount)
+ : TransactionSignatureChecker(&txTo, nInIn, amount), txTo(*txToIn) {}
};
-bool EvalScript(std::vector<std::vector<unsigned char> >& stack, const CScript& script, unsigned int flags, const BaseSignatureChecker& checker, SigVersion sigversion, ScriptError* error = NULL);
-bool VerifyScript(const CScript& scriptSig, const CScript& scriptPubKey, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror = NULL);
+bool EvalScript(std::vector<std::vector<unsigned char>> &stack,
+ const CScript &script, unsigned int flags,
+ const BaseSignatureChecker &checker, SigVersion sigversion,
+ ScriptError *error = NULL);
+bool VerifyScript(const CScript &scriptSig, const CScript &scriptPubKey,
+ unsigned int flags, const BaseSignatureChecker &checker,
+ ScriptError *serror = NULL);
#endif // BITCOIN_SCRIPT_INTERPRETER_H

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