wallet: move crypter to wallet
This commit is contained in:
Cory Fields
292
src/wallet/crypter.cpp
Normal file
292
src/wallet/crypter.cpp
Normal file
@@ -0,0 +1,292 @@
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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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196
src/wallet/crypter.h
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196
src/wallet/crypter.h
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@@ -0,0 +1,196 @@
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// Copyright (c) 2009-2014 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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#ifndef BITCOIN_CRYPTER_H
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#define BITCOIN_CRYPTER_H
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#include "keystore.h"
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#include "serialize.h"
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#include "support/allocators/secure.h"
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class uint256;
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const unsigned int WALLET_CRYPTO_KEY_SIZE = 32;
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const unsigned int WALLET_CRYPTO_SALT_SIZE = 8;
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/**
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* Private key encryption is done based on a CMasterKey,
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* which holds a salt and random encryption key.
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*
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* CMasterKeys are encrypted using AES-256-CBC using a key
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* derived using derivation method nDerivationMethod
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* (0 == EVP_sha512()) and derivation iterations nDeriveIterations.
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* vchOtherDerivationParameters is provided for alternative algorithms
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* which may require more parameters (such as scrypt).
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*
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* Wallet Private Keys are then encrypted using AES-256-CBC
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* with the double-sha256 of the public key as the IV, and the
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* master key's key as the encryption key (see keystore.[ch]).
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*/
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/** Master key for wallet encryption */
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class CMasterKey
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{
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public:
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std::vector<unsigned char> vchCryptedKey;
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std::vector<unsigned char> vchSalt;
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//! 0 = EVP_sha512()
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//! 1 = scrypt()
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unsigned int nDerivationMethod;
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unsigned int nDeriveIterations;
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//! Use this for more parameters to key derivation,
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//! such as the various parameters to scrypt
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std::vector<unsigned char> vchOtherDerivationParameters;
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ADD_SERIALIZE_METHODS;
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template <typename Stream, typename Operation>
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inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
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READWRITE(vchCryptedKey);
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READWRITE(vchSalt);
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READWRITE(nDerivationMethod);
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READWRITE(nDeriveIterations);
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READWRITE(vchOtherDerivationParameters);
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}
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CMasterKey()
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{
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// 25000 rounds is just under 0.1 seconds on a 1.86 GHz Pentium M
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// ie slightly lower than the lowest hardware we need bother supporting
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nDeriveIterations = 25000;
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nDerivationMethod = 0;
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vchOtherDerivationParameters = std::vector<unsigned char>(0);
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}
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};
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typedef std::vector<unsigned char, secure_allocator<unsigned char> > CKeyingMaterial;
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/** Encryption/decryption context with key information */
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class CCrypter
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{
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private:
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unsigned char chKey[WALLET_CRYPTO_KEY_SIZE];
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unsigned char chIV[WALLET_CRYPTO_KEY_SIZE];
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bool fKeySet;
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public:
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bool SetKeyFromPassphrase(const SecureString &strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod);
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bool Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext);
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bool Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext);
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bool SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigned char>& chNewIV);
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void CleanKey()
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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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fKeySet = false;
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}
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CCrypter()
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{
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fKeySet = false;
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// Try to keep the key data out of swap (and be a bit over-careful to keep the IV that we don't even use out of swap)
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// Note that this does nothing about suspend-to-disk (which will put all our key data on disk)
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// Note as well that at no point in this program is any attempt made to prevent stealing of keys by reading the memory of the running process.
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LockedPageManager::Instance().LockRange(&chKey[0], sizeof chKey);
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LockedPageManager::Instance().LockRange(&chIV[0], sizeof chIV);
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}
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~CCrypter()
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{
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CleanKey();
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LockedPageManager::Instance().UnlockRange(&chKey[0], sizeof chKey);
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LockedPageManager::Instance().UnlockRange(&chIV[0], sizeof chIV);
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}
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};
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/** Keystore which keeps the private keys encrypted.
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* It derives from the basic key store, which is used if no encryption is active.
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*/
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class CCryptoKeyStore : public CBasicKeyStore
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{
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private:
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CryptedKeyMap mapCryptedKeys;
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CKeyingMaterial vMasterKey;
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//! if fUseCrypto is true, mapKeys must be empty
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//! if fUseCrypto is false, vMasterKey must be empty
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bool fUseCrypto;
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//! keeps track of whether Unlock has run a thorough check before
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bool fDecryptionThoroughlyChecked;
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protected:
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bool SetCrypted();
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//! will encrypt previously unencrypted keys
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bool EncryptKeys(CKeyingMaterial& vMasterKeyIn);
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bool Unlock(const CKeyingMaterial& vMasterKeyIn);
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public:
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CCryptoKeyStore() : fUseCrypto(false), fDecryptionThoroughlyChecked(false)
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{
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}
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bool IsCrypted() const
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{
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return fUseCrypto;
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}
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bool IsLocked() const
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{
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if (!IsCrypted())
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return false;
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bool result;
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{
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LOCK(cs_KeyStore);
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result = vMasterKey.empty();
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}
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return result;
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}
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bool Lock();
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virtual bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
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bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey);
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bool HaveKey(const CKeyID &address) const
|
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{
|
||||
{
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LOCK(cs_KeyStore);
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if (!IsCrypted())
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return CBasicKeyStore::HaveKey(address);
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return mapCryptedKeys.count(address) > 0;
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}
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return false;
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}
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bool GetKey(const CKeyID &address, CKey& keyOut) const;
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bool GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const;
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||||
void GetKeys(std::set<CKeyID> &setAddress) const
|
||||
{
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||||
if (!IsCrypted())
|
||||
{
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||||
CBasicKeyStore::GetKeys(setAddress);
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return;
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||||
}
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setAddress.clear();
|
||||
CryptedKeyMap::const_iterator mi = mapCryptedKeys.begin();
|
||||
while (mi != mapCryptedKeys.end())
|
||||
{
|
||||
setAddress.insert((*mi).first);
|
||||
mi++;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Wallet status (encrypted, locked) changed.
|
||||
* Note: Called without locks held.
|
||||
*/
|
||||
boost::signals2::signal<void (CCryptoKeyStore* wallet)> NotifyStatusChanged;
|
||||
};
|
||||
|
||||
#endif // BITCOIN_CRYPTER_H
|
||||
@@ -9,11 +9,11 @@
|
||||
#include "amount.h"
|
||||
#include "primitives/block.h"
|
||||
#include "primitives/transaction.h"
|
||||
#include "crypter.h"
|
||||
#include "key.h"
|
||||
#include "keystore.h"
|
||||
#include "main.h"
|
||||
#include "ui_interface.h"
|
||||
#include "wallet/crypter.h"
|
||||
#include "wallet/wallet_ismine.h"
|
||||
#include "wallet/walletdb.h"
|
||||
|
||||
|
||||
Reference in New Issue
Block a user