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wallet: move crypter to wallet
This commit is contained in:
Cory Fields
292
src/wallet/crypter.cpp
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292
src/wallet/crypter.cpp
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// Copyright (c) 2009-2013 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "crypter.h"
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#include "script/script.h"
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#include "script/standard.h"
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#include "util.h"
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#include <string>
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#include <vector>
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#include <boost/foreach.hpp>
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#include <openssl/aes.h>
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#include <openssl/evp.h>
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bool CCrypter::SetKeyFromPassphrase(const SecureString& strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod)
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{
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if (nRounds < 1 || chSalt.size() != WALLET_CRYPTO_SALT_SIZE)
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return false;
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int i = 0;
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if (nDerivationMethod == 0)
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i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha512(), &chSalt[0],
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(unsigned char *)&strKeyData[0], strKeyData.size(), nRounds, chKey, chIV);
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if (i != (int)WALLET_CRYPTO_KEY_SIZE)
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{
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memory_cleanse(chKey, sizeof(chKey));
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memory_cleanse(chIV, sizeof(chIV));
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return false;
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}
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fKeySet = true;
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return true;
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}
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bool CCrypter::SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigned char>& chNewIV)
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{
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if (chNewKey.size() != WALLET_CRYPTO_KEY_SIZE || chNewIV.size() != WALLET_CRYPTO_KEY_SIZE)
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return false;
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memcpy(&chKey[0], &chNewKey[0], sizeof chKey);
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memcpy(&chIV[0], &chNewIV[0], sizeof chIV);
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fKeySet = true;
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return true;
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}
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bool CCrypter::Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext)
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{
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if (!fKeySet)
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return false;
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// max ciphertext len for a n bytes of plaintext is
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// n + AES_BLOCK_SIZE - 1 bytes
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int nLen = vchPlaintext.size();
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int nCLen = nLen + AES_BLOCK_SIZE, nFLen = 0;
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vchCiphertext = std::vector<unsigned char> (nCLen);
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EVP_CIPHER_CTX ctx;
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bool fOk = true;
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EVP_CIPHER_CTX_init(&ctx);
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if (fOk) fOk = EVP_EncryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
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if (fOk) fOk = EVP_EncryptUpdate(&ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen) != 0;
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if (fOk) fOk = EVP_EncryptFinal_ex(&ctx, (&vchCiphertext[0]) + nCLen, &nFLen) != 0;
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EVP_CIPHER_CTX_cleanup(&ctx);
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if (!fOk) return false;
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vchCiphertext.resize(nCLen + nFLen);
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return true;
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}
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bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext)
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{
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if (!fKeySet)
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return false;
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// plaintext will always be equal to or lesser than length of ciphertext
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int nLen = vchCiphertext.size();
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int nPLen = nLen, nFLen = 0;
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vchPlaintext = CKeyingMaterial(nPLen);
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EVP_CIPHER_CTX ctx;
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bool fOk = true;
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EVP_CIPHER_CTX_init(&ctx);
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if (fOk) fOk = EVP_DecryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
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if (fOk) fOk = EVP_DecryptUpdate(&ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen) != 0;
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if (fOk) fOk = EVP_DecryptFinal_ex(&ctx, (&vchPlaintext[0]) + nPLen, &nFLen) != 0;
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EVP_CIPHER_CTX_cleanup(&ctx);
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if (!fOk) return false;
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vchPlaintext.resize(nPLen + nFLen);
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return true;
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}
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static bool EncryptSecret(const CKeyingMaterial& vMasterKey, const CKeyingMaterial &vchPlaintext, const uint256& nIV, std::vector<unsigned char> &vchCiphertext)
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{
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CCrypter cKeyCrypter;
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std::vector<unsigned char> chIV(WALLET_CRYPTO_KEY_SIZE);
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memcpy(&chIV[0], &nIV, WALLET_CRYPTO_KEY_SIZE);
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if(!cKeyCrypter.SetKey(vMasterKey, chIV))
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return false;
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return cKeyCrypter.Encrypt(*((const CKeyingMaterial*)&vchPlaintext), vchCiphertext);
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}
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static bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCiphertext, const uint256& nIV, CKeyingMaterial& vchPlaintext)
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{
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CCrypter cKeyCrypter;
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std::vector<unsigned char> chIV(WALLET_CRYPTO_KEY_SIZE);
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memcpy(&chIV[0], &nIV, WALLET_CRYPTO_KEY_SIZE);
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if(!cKeyCrypter.SetKey(vMasterKey, chIV))
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return false;
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return cKeyCrypter.Decrypt(vchCiphertext, *((CKeyingMaterial*)&vchPlaintext));
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}
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static bool DecryptKey(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCryptedSecret, const CPubKey& vchPubKey, CKey& key)
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{
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CKeyingMaterial vchSecret;
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if(!DecryptSecret(vMasterKey, vchCryptedSecret, vchPubKey.GetHash(), vchSecret))
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return false;
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if (vchSecret.size() != 32)
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return false;
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key.Set(vchSecret.begin(), vchSecret.end(), vchPubKey.IsCompressed());
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return key.VerifyPubKey(vchPubKey);
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}
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bool CCryptoKeyStore::SetCrypted()
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{
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LOCK(cs_KeyStore);
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if (fUseCrypto)
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return true;
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if (!mapKeys.empty())
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return false;
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fUseCrypto = true;
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return true;
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}
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bool CCryptoKeyStore::Lock()
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{
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if (!SetCrypted())
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return false;
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{
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LOCK(cs_KeyStore);
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vMasterKey.clear();
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}
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NotifyStatusChanged(this);
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return true;
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}
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bool CCryptoKeyStore::Unlock(const CKeyingMaterial& vMasterKeyIn)
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{
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{
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LOCK(cs_KeyStore);
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if (!SetCrypted())
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return false;
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bool keyPass = false;
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bool keyFail = false;
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CryptedKeyMap::const_iterator mi = mapCryptedKeys.begin();
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for (; mi != mapCryptedKeys.end(); ++mi)
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{
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const CPubKey &vchPubKey = (*mi).second.first;
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const std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
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CKey key;
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if (!DecryptKey(vMasterKeyIn, vchCryptedSecret, vchPubKey, key))
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{
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keyFail = true;
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break;
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}
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keyPass = true;
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if (fDecryptionThoroughlyChecked)
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break;
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}
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if (keyPass && keyFail)
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{
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LogPrintf("The wallet is probably corrupted: Some keys decrypt but not all.");
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assert(false);
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}
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if (keyFail || !keyPass)
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return false;
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vMasterKey = vMasterKeyIn;
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fDecryptionThoroughlyChecked = true;
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}
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NotifyStatusChanged(this);
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return true;
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}
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bool CCryptoKeyStore::AddKeyPubKey(const CKey& key, const CPubKey &pubkey)
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{
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted())
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return CBasicKeyStore::AddKeyPubKey(key, pubkey);
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if (IsLocked())
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return false;
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std::vector<unsigned char> vchCryptedSecret;
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CKeyingMaterial vchSecret(key.begin(), key.end());
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if (!EncryptSecret(vMasterKey, vchSecret, pubkey.GetHash(), vchCryptedSecret))
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return false;
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if (!AddCryptedKey(pubkey, vchCryptedSecret))
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return false;
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}
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return true;
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}
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bool CCryptoKeyStore::AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret)
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{
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{
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LOCK(cs_KeyStore);
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if (!SetCrypted())
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return false;
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mapCryptedKeys[vchPubKey.GetID()] = make_pair(vchPubKey, vchCryptedSecret);
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}
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return true;
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}
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bool CCryptoKeyStore::GetKey(const CKeyID &address, CKey& keyOut) const
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{
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted())
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return CBasicKeyStore::GetKey(address, keyOut);
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CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
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if (mi != mapCryptedKeys.end())
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{
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const CPubKey &vchPubKey = (*mi).second.first;
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const std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
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return DecryptKey(vMasterKey, vchCryptedSecret, vchPubKey, keyOut);
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}
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}
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return false;
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}
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bool CCryptoKeyStore::GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const
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{
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{
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LOCK(cs_KeyStore);
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if (!IsCrypted())
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return CKeyStore::GetPubKey(address, vchPubKeyOut);
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CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
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if (mi != mapCryptedKeys.end())
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{
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vchPubKeyOut = (*mi).second.first;
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return true;
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}
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}
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return false;
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}
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bool CCryptoKeyStore::EncryptKeys(CKeyingMaterial& vMasterKeyIn)
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{
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{
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LOCK(cs_KeyStore);
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if (!mapCryptedKeys.empty() || IsCrypted())
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return false;
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fUseCrypto = true;
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BOOST_FOREACH(KeyMap::value_type& mKey, mapKeys)
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{
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const CKey &key = mKey.second;
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CPubKey vchPubKey = key.GetPubKey();
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CKeyingMaterial vchSecret(key.begin(), key.end());
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std::vector<unsigned char> vchCryptedSecret;
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if (!EncryptSecret(vMasterKeyIn, vchSecret, vchPubKey.GetHash(), vchCryptedSecret))
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return false;
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if (!AddCryptedKey(vchPubKey, vchCryptedSecret))
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return false;
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}
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mapKeys.clear();
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}
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return true;
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}
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