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implement GOST R 34.10 signatures

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orignal 2017-03-24 19:36:04 -04:00
parent 59db1ea178
commit 561757de73
1 changed files with 27 additions and 12 deletions
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39
src/key.cpp
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@ -5,6 +5,7 @@
#include <openssl/ecdsa.h> #include <openssl/ecdsa.h>
#include <openssl/rand.h> #include <openssl/rand.h>
#include <openssl/obj_mac.h> #include <openssl/obj_mac.h>
#include "Crypto.h" // i2pd
#include "Gost.h" // i2pd #include "Gost.h" // i2pd
#include "key.h" #include "key.h"
@ -197,24 +198,38 @@ public:
return o2i_ECPublicKey(&pkey, &pbegin, pubkey.size()); return o2i_ECPublicKey(&pkey, &pbegin, pubkey.size());
} }
bool Sign(const uint256 &hash, std::vector<unsigned char>& vchSig) { bool Sign(const uint256 &hash, std::vector<unsigned char>& vchSig)
unsigned int nSize = ECDSA_size(pkey); {
vchSig.resize(nSize); // Make sure it is big enough const BIGNUM * priv = EC_KEY_get0_private_key(pkey);
assert(ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], &nSize, pkey)); BIGNUM * r = BN_new (), * s = BN_new ();
vchSig.resize(nSize); // Shrink to fit actual size BIGNUM * d = BN_bin2bn (hash.begin (), 32, nullptr);
i2p::crypto::GetGOSTR3410Curve (i2p::crypto::eGOSTR3410CryptoProA)->Sign (priv, d, r, s);
vchSig.resize(64);
i2p::crypto::bn2buf (r, &vchSig[0], 32);
i2p::crypto::bn2buf (s, &vchSig[32], 32);
BN_free (d); BN_free (r); BN_free (s);
return true; return true;
} }
bool Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) { bool Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig)
// -1 = error, 0 = bad sig, 1 = good {
if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1) const EC_POINT * pub = EC_KEY_get0_public_key(pkey);
return false; BIGNUM * d = BN_bin2bn (hash.begin (), 32, nullptr);
return true; BIGNUM * r = BN_bin2bn (&vchSig[0], 32, NULL);
BIGNUM * s = BN_bin2bn (&vchSig[32], 32, NULL);
bool ret = i2p::crypto::GetGOSTR3410Curve (i2p::crypto::eGOSTR3410CryptoProA)->Verify (pub, d, r, s);
BN_free (d); BN_free (r); BN_free (s);
return ret;
} }
bool SignCompact(const uint256 &hash, unsigned char *p64, int &rec) { bool SignCompact(const uint256 &hash, unsigned char *p64, int &rec)
{
bool fOk = false; bool fOk = false;
ECDSA_SIG *sig = ECDSA_do_sign((unsigned char*)&hash, sizeof(hash), pkey); ECDSA_SIG *sig = ECDSA_SIG_new ();
const BIGNUM * priv = EC_KEY_get0_private_key(pkey);
BIGNUM * d = BN_bin2bn (hash.begin (), 32, nullptr);
i2p::crypto::GetGOSTR3410Curve (i2p::crypto::eGOSTR3410CryptoProA)->Sign (priv, d, sig->r, sig->s);
BN_free (d);
if (sig==NULL) if (sig==NULL)
return false; return false;
memset(p64, 0, 64); memset(p64, 0, 64);