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Do signature-s negation inside the tests

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To avoid the need for libsecp256k1 to expose such functionality.
This commit is contained in:
Pieter Wuille 2014-11-05 10:53:59 -08:00
parent 5406f61373
commit f4e0aefadc
5 changed files with 52 additions and 7 deletions
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4
src/ecwrapper.cpp
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@ -193,7 +193,7 @@ bool CECKey::SetPubKey(const unsigned char* pubkey, size_t size) {
return o2i_ECPublicKey(&pkey, &pubkey, size) != NULL;
}
bool CECKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, bool lowS) {
bool CECKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) {
vchSig.clear();
ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey);
if (sig == NULL)
@ -205,7 +205,7 @@ bool CECKey::Sign(const uint256 &hash, std::vector<unsigned char>& vchSig, bool
BIGNUM *halforder = BN_CTX_get(ctx);
EC_GROUP_get_order(group, order, ctx);
BN_rshift1(halforder, order);
if (lowS && BN_cmp(sig->s, halforder) > 0) {
if (BN_cmp(sig->s, halforder) > 0) {
// enforce low S values, by negating the value (modulo the order) if above order/2.
BN_sub(sig->s, order, sig->s);
}