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src/secp256k1/examples/schnorr.c

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#include <stdio.h> #include <stdio.h>
#include <assert.h> #include <assert.h>
#include <string.h> #include <string.h>
#include <secp256k1.h> #include <secp256k1.h>
#include <secp256k1_extrakeys.h> #include <secp256k1_extrakeys.h>
#include <secp256k1_schnorrsig.h> #include <secp256k1_schnorrsig.h>
#include "random.h" #include "examples_util.h"
int main(void) { int main(void) {
unsigned char msg[] = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!'}; unsigned char msg[] = {'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd', '!'};
unsigned char msg_hash[32]; unsigned char msg_hash[32];
unsigned char tag[] = {'m', 'y', '_', 'f', 'a', 'n', 'c', 'y', '_', 'p', 'r', 'o', 't', 'o', 'c', 'o', 'l'}; unsigned char tag[] = {'m', 'y', '_', 'f', 'a', 'n', 'c', 'y', '_', 'p', 'r', 'o', 't', 'o', 'c', 'o', 'l'};
unsigned char seckey[32]; unsigned char seckey[32];
unsigned char randomize[32]; unsigned char randomize[32];
unsigned char auxiliary_rand[32]; unsigned char auxiliary_rand[32];
▲ Show 20 Lines • Show All 108 Lines • ▼ Show 20 Linesint main(void) {
/* This will clear everything from the context and free the memory */ /* This will clear everything from the context and free the memory */
secp256k1_context_destroy(ctx); secp256k1_context_destroy(ctx);
/* It's best practice to try to clear secrets from memory after using them. /* It's best practice to try to clear secrets from memory after using them.
* This is done because some bugs can allow an attacker to leak memory, for * This is done because some bugs can allow an attacker to leak memory, for
* example through "out of bounds" array access (see Heartbleed), Or the OS * example through "out of bounds" array access (see Heartbleed), Or the OS
* swapping them to disk. Hence, we overwrite the secret key buffer with zeros. * swapping them to disk. Hence, we overwrite the secret key buffer with zeros.
* *
* TODO: Prevent these writes from being optimized out, as any good compiler * Here we are preventing these writes from being optimized out, as any good compiler
* will remove any writes that aren't used. */ * will remove any writes that aren't used. */
memset(seckey, 0, sizeof(seckey)); secure_erase(seckey, sizeof(seckey));
return 0; return 0;
} }