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// Copyright (c) 2009-2010 Satoshi Nakamoto
// 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 <openssl/ec.h>
#include <openssl/ecdsa.h>
#include <openssl/obj_mac.h>
// secp160k1
// const unsigned int PRIVATE_KEY_SIZE = 192;
// const unsigned int PUBLIC_KEY_SIZE = 41;
// const unsigned int SIGNATURE_SIZE = 48;
//
// secp192k1
// const unsigned int PRIVATE_KEY_SIZE = 222;
// const unsigned int PUBLIC_KEY_SIZE = 49;
// const unsigned int SIGNATURE_SIZE = 57;
//
// secp224k1
// const unsigned int PRIVATE_KEY_SIZE = 250;
// const unsigned int PUBLIC_KEY_SIZE = 57;
// const unsigned int SIGNATURE_SIZE = 66;
//
// secp256k1:
// const unsigned int PRIVATE_KEY_SIZE = 279;
// const unsigned int PUBLIC_KEY_SIZE = 65;
// const unsigned int SIGNATURE_SIZE = 72;
//
// 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
{
public:
explicit key_error(const std::string& str) : std::runtime_error(str) {}
};
// secure_allocator is defined in serialize.h
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
class CKey
{
protected:
EC_KEY* pkey;
bool fSet;
public:
CKey()
{
pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
if (pkey == NULL)
throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed");
fSet = false;
}
CKey(const CKey& b)
{
pkey = EC_KEY_dup(b.pkey);
if (pkey == NULL)
throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed");
fSet = b.fSet;
}
CKey& operator=(const CKey& b)
{
if (!EC_KEY_copy(pkey, b.pkey))
throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed");
fSet = b.fSet;
return (*this);
}
~CKey()
{
EC_KEY_free(pkey);
}
bool IsNull() const
{
return !fSet;
}
void MakeNewKey()
{
if (!EC_KEY_generate_key(pkey))
throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");
fSet = true;
}
bool SetPrivKey(const CPrivKey& vchPrivKey)
{
const unsigned char* pbegin = &vchPrivKey[0];
if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size()))
return false;
fSet = true;
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);
if (!nSize)
throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed");
CPrivKey vchPrivKey(nSize, 0);
unsigned char* pbegin = &vchPrivKey[0];
if (i2d_ECPrivateKey(pkey, &pbegin) != nSize)
throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size");
return vchPrivKey;
}
bool SetPubKey(const std::vector<unsigned char>& vchPubKey)
{
const unsigned char* pbegin = &vchPubKey[0];
if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size()))
return false;
fSet = true;
return true;
}
std::vector<unsigned char> GetPubKey() const
{
unsigned int nSize = i2o_ECPublicKey(pkey, NULL);
if (!nSize)
throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed");
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, std::vector<unsigned char>& vchSig)
{
vchSig.clear();
unsigned char pchSig[10000];
unsigned int nSize = 0;
if (!ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), pchSig, &nSize, pkey))
return false;
vchSig.resize(nSize);
memcpy(&vchSig[0], pchSig, nSize);
return true;
}
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 false;
return true;
}
CBitcoinAddress GetAddress() const
{
return CBitcoinAddress(GetPubKey());
}
};
#endif
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