X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=src%2Fkey.cpp;h=6239ba5712e1c848c7f0d8d23fa71b804c53cecd;hb=afc2bcf340f842111978138a9e04e0b14e5de9fe;hp=1b3f380224ed413cc7269d230ef90ea519a8e76b;hpb=7bd596affe6c5888e0005cc6470f16b60e810d31;p=novacoin.git

diff --git a/src/key.cpp b/src/key.cpp
index 1b3f380..6239ba5 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -224,6 +224,32 @@ bool CKey::CheckSignatureElement(const unsigned char *vch, int len, bool half) {
         CompareBigEndian(vch, len, half ? vchMaxModHalfOrder : vchMaxModOrder, 32) <= 0;
 }
 
+bool CKey::ReserealizeSignature(std::vector<unsigned char>& vchSig)
+{
+    if (vchSig.empty())
+        return false;
+
+    unsigned char *pos = &vchSig[0];
+    ECDSA_SIG *sig = d2i_ECDSA_SIG(NULL, (const unsigned char **)&pos, vchSig.size());
+    if (sig == NULL)
+        return false;
+
+    bool ret = false;
+    int nSize = i2d_ECDSA_SIG(sig, NULL);
+    if (nSize > 0) {
+        vchSig.resize(nSize); // grow or shrink as needed
+
+        pos = &vchSig[0];
+        i2d_ECDSA_SIG(sig, &pos);
+
+        ret = true;
+    }
+
+    ECDSA_SIG_free(sig);
+
+    return ret;
+}
+
 void CKey::MakeNewKey(bool fCompressed)
 {
     if (!EC_KEY_generate_key(pkey))
@@ -385,8 +411,8 @@ bool CKey::SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
     int nBitsS = BN_num_bits(sig->s);
     if (nBitsR <= 256 && nBitsS <= 256)
     {
-        int nRecId = -1;
-        for (int i=0; i<4; i++)
+        int8_t nRecId = -1;
+        for (int8_t i=0; i<4; i++)
         {
             CKey keyRec;
             keyRec.fSet = true;
@@ -456,7 +482,18 @@ bool CKey::Verify(uint256 hash, const std::vector<unsigned char>& vchSig)
     unsigned char *norm_der = NULL;
     ECDSA_SIG *norm_sig = ECDSA_SIG_new();
     const unsigned char* sigptr = &vchSig[0];
-    d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size());
+    assert(norm_sig);
+    if (d2i_ECDSA_SIG(&norm_sig, &sigptr, vchSig.size()) == NULL)
+    {
+        /* As of OpenSSL 1.0.0p d2i_ECDSA_SIG frees and nulls the pointer on
+        * error. But OpenSSL's own use of this function redundantly frees the
+        * result. As ECDSA_SIG_free(NULL) is a no-op, and in the absence of a
+        * clear contract for the function behaving the same way is more
+        * conservative.
+        */
+        ECDSA_SIG_free(norm_sig);
+        return false;
+    }
     int derlen = i2d_ECDSA_SIG(norm_sig, &norm_der);
     ECDSA_SIG_free(norm_sig);
     if (derlen <= 0)