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-rw-r--r--src/key.cpp19
1 files changed, 18 insertions, 1 deletions
diff --git a/src/key.cpp b/src/key.cpp
index 1ab4c62ebf..2247c99475 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -194,9 +194,26 @@ public:
}
bool 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)
+ return false;
+ if (BN_is_odd(sig->s)) {
+ // enforce even S values, by negating the value (modulo the order) if odd
+ BN_CTX *ctx = BN_CTX_new();
+ BN_CTX_start(ctx);
+ const EC_GROUP *group = EC_KEY_get0_group(pkey);
+ BIGNUM *order = BN_CTX_get(ctx);
+ EC_GROUP_get_order(group, order, ctx);
+ BN_sub(sig->s, order, sig->s);
+ BN_CTX_end(ctx);
+ BN_CTX_free(ctx);
+ }
unsigned int nSize = ECDSA_size(pkey);
vchSig.resize(nSize); // Make sure it is big enough
- assert(ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey));
+ unsigned char *pos = &vchSig[0];
+ nSize = i2d_ECDSA_SIG(sig, &pos);
+ ECDSA_SIG_free(sig);
vchSig.resize(nSize); // Shrink to fit actual size
return true;
}