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298 lines
7.3 KiB
C++
298 lines
7.3 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2011 The Bitcoin developers
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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 <stdexcept>
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#include <vector>
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#include <cassert>
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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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#include <boost/shared_ptr.hpp>
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#include "SecureAllocator.h"
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#include "RippleAddress.h"
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#include "uint256.h"
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#include "base58.h"
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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; // but we don't use full keys
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// const unsigned int COMPUB_KEY_SIZE = 33;
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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 okay = 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_conv_form(eckey, POINT_CONVERSION_COMPRESSED);
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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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okay = 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 (okay);
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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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//JED: 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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typedef std::vector<unsigned char> CPrivKey;
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typedef std::vector<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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typedef boost::shared_ptr<CKey> pointer;
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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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EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
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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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EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
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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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static uint128 PassPhraseToKey(const std::string& passPhrase);
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static EC_KEY* GenerateRootDeterministicKey(const uint128& passPhrase);
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static EC_KEY* GenerateRootPubKey(BIGNUM* pubGenerator);
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static EC_KEY* GeneratePublicDeterministicKey(const RippleAddress& generator, int n);
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static EC_KEY* GeneratePrivateDeterministicKey(const RippleAddress& family, const BIGNUM* rootPriv, int n);
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static EC_KEY* GeneratePrivateDeterministicKey(const RippleAddress& family, const uint256& rootPriv, int n);
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CKey(const uint128& passPhrase) : fSet(false)
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{
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pkey = GenerateRootDeterministicKey(passPhrase);
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fSet = true;
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assert(pkey);
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}
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CKey(const RippleAddress& generator, int n) : fSet(false)
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{ // public deterministic key
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pkey = GeneratePublicDeterministicKey(generator, n);
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fSet = true;
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assert(pkey);
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}
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CKey(const RippleAddress& base, const BIGNUM* rootPrivKey, int n) : fSet(false)
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{ // private deterministic key
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pkey = GeneratePrivateDeterministicKey(base, rootPrivKey, n);
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fSet = true;
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assert(pkey);
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}
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CKey(const uint256& privateKey) : pkey(NULL), fSet(false)
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{
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// XXX Broken pkey is null.
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SetPrivateKeyU(privateKey);
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}
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#if 0
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CKey(const RippleAddress& masterKey, int keyNum, bool isPublic) : pkey(NULL), fSet(false)
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{
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if (isPublic)
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SetPubSeq(masterKey, keyNum);
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else
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SetPrivSeq(masterKey, keyNum); // broken, need seed
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fSet = true;
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}
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#endif
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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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EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
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fSet = true;
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}
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// XXX Still used!
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BIGNUM* GetSecretBN() const
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{ // DEPRECATED
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return BN_dup(EC_KEY_get0_private_key(pkey));
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}
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void GetPrivateKeyU(uint256& privKey)
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{
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const BIGNUM* bn = EC_KEY_get0_private_key(pkey);
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if (bn == NULL)
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throw key_error("CKey::GetPrivateKeyU: EC_KEY_get0_private_key failed");
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privKey.zero();
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BN_bn2bin(bn, privKey.begin() + (privKey.size() - BN_num_bytes(bn)));
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}
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bool SetPrivateKeyU(const uint256& key, bool bThrow=false)
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{
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// XXX Broken if pkey is not set.
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BIGNUM* bn = BN_bin2bn(key.begin(), key.size(), NULL);
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bool bSuccess = !!EC_KEY_set_private_key(pkey, bn);
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BN_clear_free(bn);
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if (bSuccess)
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{
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fSet = true;
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}
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else if (bThrow)
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{
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throw key_error("CKey::SetPrivateKeyU: EC_KEY_set_private_key failed");
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}
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return bSuccess;
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}
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bool SetPubKey(const void *ptr, size_t len)
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{
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const unsigned char* pbegin = static_cast<const unsigned char *>(ptr);
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if (!o2i_ECPublicKey(&pkey, &pbegin, len))
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return false;
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EC_KEY_set_conv_form(pkey, POINT_CONVERSION_COMPRESSED);
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fSet = true;
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return true;
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}
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bool SetPubKey(const std::vector<unsigned char>& vchPubKey)
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{
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return SetPubKey(&vchPubKey[0], vchPubKey.size());
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}
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bool SetPubKey(const std::string& pubKey)
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{
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return SetPubKey(pubKey.data(), pubKey.size());
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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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assert(nSize<=33);
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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(33, 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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assert(vchPubKey.size()<=33);
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return vchPubKey;
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}
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bool Sign(const uint256& hash, std::vector<unsigned char>& vchSig)
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{
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unsigned char pchSig[10000];
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unsigned int nSize = 0;
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vchSig.clear();
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if (!ECDSA_sign(0, (unsigned char*)hash.begin(), hash.size(), 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(const uint256& hash, const void *sig, size_t sigLen) const
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{
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// -1 = error, 0 = bad sig, 1 = good
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if (ECDSA_verify(0, hash.begin(), hash.size(), (const unsigned char *) sig, sigLen, pkey) != 1)
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return false;
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return true;
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}
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bool Verify(const uint256& hash, const std::vector<unsigned char>& vchSig) const
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{
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return Verify(hash, &vchSig[0], vchSig.size());
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}
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bool Verify(const uint256& hash, const std::string& sig) const
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{
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return Verify(hash, sig.data(), sig.size());
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}
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// ECIES functions. These throw on failure
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// returns a 32-byte secret unique to these two keys. At least one private key must be known.
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void getECIESSecret(CKey& otherKey, uint256& enc_key, uint256& hmac_key);
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// encrypt/decrypt functions with integrity checking.
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// Note that the other side must somehow know what keys to use
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std::vector<unsigned char> encryptECIES(CKey& otherKey, const std::vector<unsigned char>& plaintext);
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std::vector<unsigned char> decryptECIES(CKey& otherKey, const std::vector<unsigned char>& ciphertext);
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};
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#endif
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// vim:ts=4
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