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Compact signatures with compressed pubkeys

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Pieter Wuille 2011-12-25 15:02:31 +01:00 committed by Pieter Wuille
parent 11529c6e4f
commit d4d9c734c3
1 changed files with 11 additions and 3 deletions
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14
src/key.h
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@ -236,6 +236,8 @@ public:
{
CKey keyRec;
keyRec.fSet = true;
if (fCompressedPubKey)
keyRec.SetCompressedPubKey();
if (ECDSA_SIG_recover_key_GFp(keyRec.pkey, sig, (unsigned char*)&hash, sizeof(hash), i, 1) == 1)
if (keyRec.GetPubKey() == this->GetPubKey())
{
@ -247,7 +249,7 @@ public:
if (nRecId == -1)
throw key_error("CKey::SignCompact() : unable to construct recoverable key");
vchSig[0] = nRecId+27;
vchSig[0] = nRecId+27+(fCompressedPubKey ? 4 : 0);
BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
BN_bn2bin(sig->s,&vchSig[65-(nBitsS+7)/8]);
fOk = true;
@ -264,7 +266,8 @@ public:
{
if (vchSig.size() != 65)
return false;
if (vchSig[0]<27 || vchSig[0]>=31)
int nV = vchSig[0];
if (nV<27 || nV>=35)
return false;
ECDSA_SIG *sig = ECDSA_SIG_new();
BN_bin2bn(&vchSig[1],32,sig->r);
@ -272,7 +275,12 @@ public:
EC_KEY_free(pkey);
pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), vchSig[0] - 27, 0) == 1)
if (nV >= 31)
{
SetCompressedPubKey();
nV -= 4;
}
if (ECDSA_SIG_recover_key_GFp(pkey, sig, (unsigned char*)&hash, sizeof(hash), nV - 27, 0) == 1)
{
fSet = true;
ECDSA_SIG_free(sig);