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230 lines
6.2 KiB
230 lines
6.2 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto |
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// Distributed under the MIT/X11 software license, see the accompanying |
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// file license.txt or http://www.opensource.org/licenses/mit-license.php. |
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#ifndef BITCOIN_KEY_H |
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#define BITCOIN_KEY_H |
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#include <openssl/ec.h> |
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#include <openssl/ecdsa.h> |
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#include <openssl/obj_mac.h> |
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// secp160k1 |
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// const unsigned int PRIVATE_KEY_SIZE = 192; |
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// const unsigned int PUBLIC_KEY_SIZE = 41; |
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// const unsigned int SIGNATURE_SIZE = 48; |
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// |
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// secp192k1 |
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// const unsigned int PRIVATE_KEY_SIZE = 222; |
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// const unsigned int PUBLIC_KEY_SIZE = 49; |
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// const unsigned int SIGNATURE_SIZE = 57; |
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// |
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// secp224k1 |
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// const unsigned int PRIVATE_KEY_SIZE = 250; |
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// const unsigned int PUBLIC_KEY_SIZE = 57; |
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// const unsigned int SIGNATURE_SIZE = 66; |
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// |
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// secp256k1: |
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// const unsigned int PRIVATE_KEY_SIZE = 279; |
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// const unsigned int PUBLIC_KEY_SIZE = 65; |
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// const unsigned int SIGNATURE_SIZE = 72; |
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// |
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// see www.keylength.com |
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// script supports up to 75 for single byte push |
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int static inline EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key) |
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{ |
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int ok = 0; |
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BN_CTX *ctx = NULL; |
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EC_POINT *pub_key = NULL; |
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if (!eckey) return 0; |
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const EC_GROUP *group = EC_KEY_get0_group(eckey); |
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if ((ctx = BN_CTX_new()) == NULL) |
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goto err; |
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pub_key = EC_POINT_new(group); |
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if (pub_key == NULL) |
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goto err; |
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if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, ctx)) |
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goto err; |
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EC_KEY_set_private_key(eckey,priv_key); |
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EC_KEY_set_public_key(eckey,pub_key); |
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ok = 1; |
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err: |
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if (pub_key) |
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EC_POINT_free(pub_key); |
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if (ctx != NULL) |
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BN_CTX_free(ctx); |
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return(ok); |
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} |
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class key_error : public std::runtime_error |
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{ |
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public: |
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explicit key_error(const std::string& str) : std::runtime_error(str) {} |
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}; |
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// secure_allocator is defined in serialize.h |
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typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey; |
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typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret; |
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class CKey |
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{ |
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protected: |
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EC_KEY* pkey; |
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bool fSet; |
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public: |
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CKey() |
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{ |
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1); |
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if (pkey == NULL) |
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throw key_error("CKey::CKey() : EC_KEY_new_by_curve_name failed"); |
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fSet = false; |
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} |
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CKey(const CKey& b) |
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{ |
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pkey = EC_KEY_dup(b.pkey); |
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if (pkey == NULL) |
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throw key_error("CKey::CKey(const CKey&) : EC_KEY_dup failed"); |
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fSet = b.fSet; |
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} |
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CKey& operator=(const CKey& b) |
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{ |
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if (!EC_KEY_copy(pkey, b.pkey)) |
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throw key_error("CKey::operator=(const CKey&) : EC_KEY_copy failed"); |
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fSet = b.fSet; |
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return (*this); |
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} |
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~CKey() |
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{ |
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EC_KEY_free(pkey); |
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} |
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bool IsNull() const |
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{ |
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return !fSet; |
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} |
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void MakeNewKey() |
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{ |
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if (!EC_KEY_generate_key(pkey)) |
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throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed"); |
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fSet = true; |
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} |
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bool SetPrivKey(const CPrivKey& vchPrivKey) |
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{ |
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const unsigned char* pbegin = &vchPrivKey[0]; |
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if (!d2i_ECPrivateKey(&pkey, &pbegin, vchPrivKey.size())) |
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return false; |
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fSet = true; |
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return true; |
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} |
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bool SetSecret(const CSecret& vchSecret) |
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{ |
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EC_KEY_free(pkey); |
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pkey = EC_KEY_new_by_curve_name(NID_secp256k1); |
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if (pkey == NULL) |
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throw key_error("CKey::SetSecret() : EC_KEY_new_by_curve_name failed"); |
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if (vchSecret.size() != 32) |
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throw key_error("CKey::SetSecret() : secret must be 32 bytes"); |
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BIGNUM *bn = BN_bin2bn(&vchSecret[0],32,BN_new()); |
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if (bn == NULL) |
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throw key_error("CKey::SetSecret() : BN_bin2bn failed"); |
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if (!EC_KEY_regenerate_key(pkey,bn)) |
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throw key_error("CKey::SetSecret() : EC_KEY_regenerate_key failed"); |
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BN_clear_free(bn); |
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fSet = true; |
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return true; |
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} |
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CSecret GetSecret() const |
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{ |
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CSecret vchRet; |
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vchRet.resize(32); |
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const BIGNUM *bn = EC_KEY_get0_private_key(pkey); |
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int nBytes = BN_num_bytes(bn); |
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if (bn == NULL) |
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throw key_error("CKey::GetSecret() : EC_KEY_get0_private_key failed"); |
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int n=BN_bn2bin(bn,&vchRet[32 - nBytes]); |
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if (n != nBytes) |
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throw key_error("CKey::GetSecret(): BN_bn2bin failed"); |
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return vchRet; |
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} |
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CPrivKey GetPrivKey() const |
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{ |
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unsigned int nSize = i2d_ECPrivateKey(pkey, NULL); |
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if (!nSize) |
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey failed"); |
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CPrivKey vchPrivKey(nSize, 0); |
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unsigned char* pbegin = &vchPrivKey[0]; |
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if (i2d_ECPrivateKey(pkey, &pbegin) != nSize) |
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throw key_error("CKey::GetPrivKey() : i2d_ECPrivateKey returned unexpected size"); |
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return vchPrivKey; |
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} |
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bool SetPubKey(const std::vector<unsigned char>& vchPubKey) |
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{ |
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const unsigned char* pbegin = &vchPubKey[0]; |
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if (!o2i_ECPublicKey(&pkey, &pbegin, vchPubKey.size())) |
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return false; |
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fSet = true; |
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return true; |
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} |
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std::vector<unsigned char> GetPubKey() const |
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{ |
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unsigned int nSize = i2o_ECPublicKey(pkey, NULL); |
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if (!nSize) |
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throw key_error("CKey::GetPubKey() : i2o_ECPublicKey failed"); |
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std::vector<unsigned char> vchPubKey(nSize, 0); |
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unsigned char* pbegin = &vchPubKey[0]; |
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if (i2o_ECPublicKey(pkey, &pbegin) != nSize) |
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throw key_error("CKey::GetPubKey() : i2o_ECPublicKey returned unexpected size"); |
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return vchPubKey; |
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} |
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bool Sign(uint256 hash, std::vector<unsigned char>& vchSig) |
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{ |
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vchSig.clear(); |
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unsigned char pchSig[10000]; |
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unsigned int nSize = 0; |
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if (!ECDSA_sign(0, (unsigned char*)&hash, sizeof(hash), pchSig, &nSize, pkey)) |
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return false; |
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vchSig.resize(nSize); |
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memcpy(&vchSig[0], pchSig, nSize); |
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return true; |
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} |
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bool Verify(uint256 hash, const std::vector<unsigned char>& vchSig) |
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{ |
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// -1 = error, 0 = bad sig, 1 = good |
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if (ECDSA_verify(0, (unsigned char*)&hash, sizeof(hash), &vchSig[0], vchSig.size(), pkey) != 1) |
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return false; |
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return true; |
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} |
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CBitcoinAddress GetAddress() const |
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{ |
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return CBitcoinAddress(GetPubKey()); |
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} |
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}; |
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#endif
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