frost/secp256k1-zkp
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Improve signing API documentation & specification

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This commit is contained in:
Pieter Wuille
2015-02-12 18:00:50 -08:00
parent 7b2fc1cac6
commit 8030d7c0e5
3 changed files with 56 additions and 9 deletions
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18
src/secp256k1.c
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@@ -87,7 +87,11 @@ int secp256k1_ecdsa_sign(const unsigned char *msg32, unsigned char *signature, i
noncefp = secp256k1_nonce_function_default;
}
secp256k1_scalar_set_b32(&sec, seckey, NULL);
secp256k1_scalar_set_b32(&sec, seckey, &overflow);
if (overflow || secp256k1_scalar_is_zero(&sec)) {
*signaturelen = 0;
return 0;
}
secp256k1_scalar_set_b32(&msg, msg32, NULL);
while (1) {
unsigned char nonce32[32];
@@ -107,6 +111,9 @@ int secp256k1_ecdsa_sign(const unsigned char *msg32, unsigned char *signature, i
if (ret) {
ret = secp256k1_ecdsa_sig_serialize(signature, signaturelen, &sig);
}
if (!ret) {
*signaturelen = 0;
}
secp256k1_scalar_clear(&msg);
secp256k1_scalar_clear(&non);
secp256k1_scalar_clear(&sec);
@@ -127,7 +134,11 @@ int secp256k1_ecdsa_sign_compact(const unsigned char *msg32, unsigned char *sig6
noncefp = secp256k1_nonce_function_default;
}
secp256k1_scalar_set_b32(&sec, seckey, NULL);
secp256k1_scalar_set_b32(&sec, seckey, &overflow);
if (overflow || secp256k1_scalar_is_zero(&sec)) {
memset(sig64, 0, 64);
return 0;
}
secp256k1_scalar_set_b32(&msg, msg32, NULL);
while (1) {
unsigned char nonce32[32];
@@ -148,6 +159,9 @@ int secp256k1_ecdsa_sign_compact(const unsigned char *msg32, unsigned char *sig6
secp256k1_scalar_get_b32(sig64, &sig.r);
secp256k1_scalar_get_b32(sig64 + 32, &sig.s);
}
if (!ret) {
memset(sig64, 0, 64);
}
secp256k1_scalar_clear(&msg);
secp256k1_scalar_clear(&non);
secp256k1_scalar_clear(&sec);