Mercurial > hg > bitcoin

changeset 2856:0ad65efc636c draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Minimal support for compressed-key signature recovery (for verifymessage) Upstream commits: 11529c6e4f7288d8a64c488a726ee3821c7adefe d4d9c734c315e99136fe245c5733ca75cab9f8bf
author Luke Dashjr <luke-jr+git@utopios.org>
date Tue, 27 Mar 2012 20:03:28 -0400
parents bdff5864eff3
children b5c673335b60
files src/key.h
diffstat 1 files changed, 13 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/src/key.h
+++ b/src/key.h
@@ -169,6 +169,11 @@
     EC_KEY* pkey;
     bool fSet;
 
+    void SetCompressedPubKey()
+    {
+        EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
+    }
+
 public:
     CKey()
     {
@@ -346,7 +351,8 @@
     {
         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 @@
 
         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);