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Minimal support for compressed-key signature recovery (for verifymessage)

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Upstream commits:
	11529c6e4f7288d8a64c488a726ee3821c7adefe
	d4d9c734c315e99136fe245c5733ca75cab9f8bf
This commit is contained in:
Luke Dashjr 2012-03-27 20:03:28 -04:00
parent f53c5ede73
commit ddd0d9ae54
1 changed files with 13 additions and 2 deletions
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15
src/key.h
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@ -169,6 +169,11 @@ protected:
EC_KEY* pkey;
bool fSet;
void SetCompressedPubKey()
{
EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
}
public:
CKey()
{
@ -346,7 +351,8 @@ 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);
@ -354,7 +360,12 @@ 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);