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src/secp256k1/src/modules/extrakeys/main_impl.h
| /********************************************************************** | /********************************************************************** | ||||
| * Copyright (c) 2020 Jonas Nick * | * Copyright (c) 2020 Jonas Nick * | ||||
| * Distributed under the MIT software license, see the accompanying * | * Distributed under the MIT software license, see the accompanying * | ||||
| * file COPYING or http://www.opensource.org/licenses/mit-license.php.* | * file COPYING or http://www.opensource.org/licenses/mit-license.php.* | ||||
| **********************************************************************/ | **********************************************************************/ | ||||
| #ifndef _SECP256K1_MODULE_EXTRAKEYS_MAIN_ | #ifndef _SECP256K1_MODULE_EXTRAKEYS_MAIN_ | ||||
| #define _SECP256K1_MODULE_EXTRAKEYS_MAIN_ | #define _SECP256K1_MODULE_EXTRAKEYS_MAIN_ | ||||
| #include "include/secp256k1.h" | #include "include/secp256k1.h" | ||||
| #include "include/secp256k1_extrakeys.h" | #include "include/secp256k1_extrakeys.h" | ||||
| static SECP256K1_INLINE int secp256k1_xonly_pubkey_load(const secp256k1_context* ctx, secp256k1_ge *ge, const secp256k1_xonly_pubkey *pubkey) { | |||||
| return secp256k1_pubkey_load(ctx, ge, (const secp256k1_pubkey *) pubkey); | |||||
| } | |||||
| static SECP256K1_INLINE void secp256k1_xonly_pubkey_save(secp256k1_xonly_pubkey *pubkey, secp256k1_ge *ge) { | |||||
| secp256k1_pubkey_save((secp256k1_pubkey *) pubkey, ge); | |||||
| } | |||||
| int secp256k1_xonly_pubkey_parse(const secp256k1_context* ctx, secp256k1_xonly_pubkey *pubkey, const unsigned char *input32) { | |||||
| secp256k1_ge pk; | |||||
| secp256k1_fe x; | |||||
| VERIFY_CHECK(ctx != NULL); | |||||
| ARG_CHECK(pubkey != NULL); | |||||
| memset(pubkey, 0, sizeof(*pubkey)); | |||||
| ARG_CHECK(input32 != NULL); | |||||
| if (!secp256k1_fe_set_b32(&x, input32)) { | |||||
| return 0; | |||||
| } | |||||
| if (!secp256k1_ge_set_xo_var(&pk, &x, 0)) { | |||||
| return 0; | |||||
| } | |||||
| secp256k1_xonly_pubkey_save(pubkey, &pk); | |||||
| return 1; | |||||
| } | |||||
| int secp256k1_xonly_pubkey_serialize(const secp256k1_context* ctx, unsigned char *output32, const secp256k1_xonly_pubkey *pubkey) { | |||||
| secp256k1_ge pk; | |||||
| VERIFY_CHECK(ctx != NULL); | |||||
| ARG_CHECK(output32 != NULL); | |||||
| memset(output32, 0, 32); | |||||
| ARG_CHECK(pubkey != NULL); | |||||
| if (!secp256k1_xonly_pubkey_load(ctx, &pk, pubkey)) { | |||||
| return 0; | |||||
| } | |||||
| secp256k1_fe_get_b32(output32, &pk.x); | |||||
| return 1; | |||||
| } | |||||
| /** Keeps a group element as is if it has an even Y and otherwise negates it. | |||||
| * y_parity is set to 0 in the former case and to 1 in the latter case. | |||||
| * Requires that the coordinates of r are normalized. */ | |||||
| static int secp256k1_extrakeys_ge_even_y(secp256k1_ge *r) { | |||||
| int y_parity = 0; | |||||
| VERIFY_CHECK(!secp256k1_ge_is_infinity(r)); | |||||
| if (secp256k1_fe_is_odd(&r->y)) { | |||||
| secp256k1_fe_negate(&r->y, &r->y, 1); | |||||
| y_parity = 1; | |||||
| } | |||||
| return y_parity; | |||||
| } | |||||
| int secp256k1_xonly_pubkey_from_pubkey(const secp256k1_context* ctx, secp256k1_xonly_pubkey *xonly_pubkey, int *pk_parity, const secp256k1_pubkey *pubkey) { | |||||
| secp256k1_ge pk; | |||||
| int tmp; | |||||
| VERIFY_CHECK(ctx != NULL); | |||||
| ARG_CHECK(xonly_pubkey != NULL); | |||||
| ARG_CHECK(pubkey != NULL); | |||||
| if (!secp256k1_pubkey_load(ctx, &pk, pubkey)) { | |||||
| return 0; | |||||
| } | |||||
| tmp = secp256k1_extrakeys_ge_even_y(&pk); | |||||
| if (pk_parity != NULL) { | |||||
| *pk_parity = tmp; | |||||
| } | |||||
| secp256k1_xonly_pubkey_save(xonly_pubkey, &pk); | |||||
| return 1; | |||||
| } | |||||
| #endif | #endif | ||||