// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2011 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+#ifndef BITCOIN_KEY_H
+#define BITCOIN_KEY_H
+#include <stdexcept>
+#include <vector>
+
+#include <openssl/ec.h>
+#include <openssl/ecdsa.h>
+#include <openssl/obj_mac.h>
+
+#include "serialize.h"
+#include "uint256.h"
+#include "base58.h"
// secp160k1
// const unsigned int PRIVATE_KEY_SIZE = 192;
// see www.keylength.com
// script supports up to 75 for single byte push
+int static inline EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
+{
+ int ok = 0;
+ BN_CTX *ctx = NULL;
+ EC_POINT *pub_key = NULL;
+
+ if (!eckey) return 0;
+
+ const EC_GROUP *group = EC_KEY_get0_group(eckey);
+
+ if ((ctx = BN_CTX_new()) == NULL)
+ goto err;
+
+ pub_key = EC_POINT_new(group);
+
+ if (pub_key == NULL)
+ goto err;
+
+ if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx))
+ goto err;
+
+ EC_KEY_set_private_key(eckey,priv_key);
+ EC_KEY_set_public_key(eckey,pub_key);
+
+ ok = 1;
+
+err:
+
+ if (pub_key)
+ EC_POINT_free(pub_key);
+ if (ctx != NULL)
+ BN_CTX_free(ctx);
+
+ return(ok);
+}
class key_error : public std::runtime_error
// secure_allocator is defined in serialize.h
-typedef vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
-
-
+typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
+typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
class CKey
{
return true;
}
+ bool SetSecret(const CSecret& vchSecret)
+ {
+ EC_KEY_free(pkey);
+ pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
+ if (pkey == NULL)
+ throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed");
+ if (vchSecret.size() != 32)
+ throw key_error("CKey::SetSecret() : secret must be 32 bytes");
+ BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new());
+ if (bn == NULL)
+ throw key_error("CKey::SetSecret() : BN_bin2bn failed");
+ if (!EC_KEY_regenerate_key(pkey,bn))
+ throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed");
+ BN_clear_free(bn);
+ fSet = true;
+ return true;
+ }
+
+ CSecret GetSecret() const
+ {
+ CSecret vchRet;
+ vchRet.resize(32);
+ const BIGNUM *bn = EC_KEY_get0_private_key(pkey);
+ int nBytes = BN_num_bytes(bn);
+ if (bn == NULL)
+ throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed");
+ int n=BN_bn2bin(bn,&vchRet[32 - nBytes]);
+ if (n != nBytes)
+ throw key_error("CKey::GetSecret(): BN_bn2bin failed");
+ return vchRet;
+ }
+
CPrivKey GetPrivKey() const
{
unsigned int nSize = i2d_ECPrivateKey(pkey, NULL);
return vchPrivKey;
}
- bool SetPubKey(const vector<unsigned char>& vchPubKey)
+ bool SetPubKey(const std::vector<unsigned char>& vchPubKey)
{
const unsigned char* pbegin = &vchPubKey[0];
if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
return true;
}
- vector<unsigned char> GetPubKey() const
+ std::vector<unsigned char> GetPubKey() const
{
unsigned int nSize = i2o_ECPublicKey(pkey, NULL);
if (!nSize)
throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
- vector<unsigned char> vchPubKey(nSize, 0);
+ std::vector<unsigned char> vchPubKey(nSize, 0);
unsigned char* pbegin = &vchPubKey[0];
if (i2o_ECPublicKey(pkey, &pbegin) != nSize)
throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size");
return vchPubKey;
}
- bool Sign(uint256 hash, vector<unsigned char>& vchSig)
+ bool Sign(uint256 hash, std::vector<unsigned char>& vchSig)
{
vchSig.clear();
unsigned char pchSig[10000];
return true;
}
- bool Verify(uint256 hash, const vector<unsigned char>& vchSig)
+ bool Verify(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)
return true;
}
- static bool Sign(const CPrivKey& vchPrivKey, uint256 hash, vector<unsigned char>& vchSig)
- {
- CKey key;
- if (!key.SetPrivKey(vchPrivKey))
- return false;
- return key.Sign(hash, vchSig);
- }
-
- static bool Verify(const vector<unsigned char>& vchPubKey, uint256 hash, const vector<unsigned char>& vchSig)
+ CBitcoinAddress GetAddress() const
{
- CKey key;
- if (!key.SetPubKey(vchPubKey))
- return false;
- return key.Verify(hash, vchSig);
+ return CBitcoinAddress(GetPubKey());
}
};
+
+#endif