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-rw-r--r--src/wallet/crypter.cpp292
1 files changed, 292 insertions, 0 deletions
diff --git a/src/wallet/crypter.cpp b/src/wallet/crypter.cpp
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+++ b/src/wallet/crypter.cpp
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+// Copyright (c) 2009-2013 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "crypter.h"
+
+#include "script/script.h"
+#include "script/standard.h"
+#include "util.h"
+
+#include <string>
+#include <vector>
+#include <boost/foreach.hpp>
+#include <openssl/aes.h>
+#include <openssl/evp.h>
+
+bool CCrypter::SetKeyFromPassphrase(const SecureString& strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod)
+{
+ if (nRounds < 1 || chSalt.size() != WALLET_CRYPTO_SALT_SIZE)
+ return false;
+
+ int i = 0;
+ if (nDerivationMethod == 0)
+ i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha512(), &chSalt[0],
+ (unsigned char *)&strKeyData[0], strKeyData.size(), nRounds, chKey, chIV);
+
+ if (i != (int)WALLET_CRYPTO_KEY_SIZE)
+ {
+ memory_cleanse(chKey, sizeof(chKey));
+ memory_cleanse(chIV, sizeof(chIV));
+ return false;
+ }
+
+ fKeySet = true;
+ return true;
+}
+
+bool CCrypter::SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigned char>& chNewIV)
+{
+ if (chNewKey.size() != WALLET_CRYPTO_KEY_SIZE || chNewIV.size() != WALLET_CRYPTO_KEY_SIZE)
+ return false;
+
+ memcpy(&chKey[0], &chNewKey[0], sizeof chKey);
+ memcpy(&chIV[0], &chNewIV[0], sizeof chIV);
+
+ fKeySet = true;
+ return true;
+}
+
+bool CCrypter::Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext)
+{
+ if (!fKeySet)
+ return false;
+
+ // max ciphertext len for a n bytes of plaintext is
+ // n + AES_BLOCK_SIZE - 1 bytes
+ int nLen = vchPlaintext.size();
+ int nCLen = nLen + AES_BLOCK_SIZE, nFLen = 0;
+ vchCiphertext = std::vector<unsigned char> (nCLen);
+
+ EVP_CIPHER_CTX ctx;
+
+ bool fOk = true;
+
+ EVP_CIPHER_CTX_init(&ctx);
+ if (fOk) fOk = EVP_EncryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
+ if (fOk) fOk = EVP_EncryptUpdate(&ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen) != 0;
+ if (fOk) fOk = EVP_EncryptFinal_ex(&ctx, (&vchCiphertext[0]) + nCLen, &nFLen) != 0;
+ EVP_CIPHER_CTX_cleanup(&ctx);
+
+ if (!fOk) return false;
+
+ vchCiphertext.resize(nCLen + nFLen);
+ return true;
+}
+
+bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext)
+{
+ if (!fKeySet)
+ return false;
+
+ // plaintext will always be equal to or lesser than length of ciphertext
+ int nLen = vchCiphertext.size();
+ int nPLen = nLen, nFLen = 0;
+
+ vchPlaintext = CKeyingMaterial(nPLen);
+
+ EVP_CIPHER_CTX ctx;
+
+ bool fOk = true;
+
+ EVP_CIPHER_CTX_init(&ctx);
+ if (fOk) fOk = EVP_DecryptInit_ex(&ctx, EVP_aes_256_cbc(), NULL, chKey, chIV) != 0;
+ if (fOk) fOk = EVP_DecryptUpdate(&ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen) != 0;
+ if (fOk) fOk = EVP_DecryptFinal_ex(&ctx, (&vchPlaintext[0]) + nPLen, &nFLen) != 0;
+ EVP_CIPHER_CTX_cleanup(&ctx);
+
+ if (!fOk) return false;
+
+ vchPlaintext.resize(nPLen + nFLen);
+ return true;
+}
+
+
+static bool EncryptSecret(const CKeyingMaterial& vMasterKey, const CKeyingMaterial &vchPlaintext, const uint256& nIV, std::vector<unsigned char> &vchCiphertext)
+{
+ CCrypter cKeyCrypter;
+ std::vector<unsigned char> chIV(WALLET_CRYPTO_KEY_SIZE);
+ memcpy(&chIV[0], &nIV, WALLET_CRYPTO_KEY_SIZE);
+ if(!cKeyCrypter.SetKey(vMasterKey, chIV))
+ return false;
+ return cKeyCrypter.Encrypt(*((const CKeyingMaterial*)&vchPlaintext), vchCiphertext);
+}
+
+static bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCiphertext, const uint256& nIV, CKeyingMaterial& vchPlaintext)
+{
+ CCrypter cKeyCrypter;
+ std::vector<unsigned char> chIV(WALLET_CRYPTO_KEY_SIZE);
+ memcpy(&chIV[0], &nIV, WALLET_CRYPTO_KEY_SIZE);
+ if(!cKeyCrypter.SetKey(vMasterKey, chIV))
+ return false;
+ return cKeyCrypter.Decrypt(vchCiphertext, *((CKeyingMaterial*)&vchPlaintext));
+}
+
+static bool DecryptKey(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCryptedSecret, const CPubKey& vchPubKey, CKey& key)
+{
+ CKeyingMaterial vchSecret;
+ if(!DecryptSecret(vMasterKey, vchCryptedSecret, vchPubKey.GetHash(), vchSecret))
+ return false;
+
+ if (vchSecret.size() != 32)
+ return false;
+
+ key.Set(vchSecret.begin(), vchSecret.end(), vchPubKey.IsCompressed());
+ return key.VerifyPubKey(vchPubKey);
+}
+
+bool CCryptoKeyStore::SetCrypted()
+{
+ LOCK(cs_KeyStore);
+ if (fUseCrypto)
+ return true;
+ if (!mapKeys.empty())
+ return false;
+ fUseCrypto = true;
+ return true;
+}
+
+bool CCryptoKeyStore::Lock()
+{
+ if (!SetCrypted())
+ return false;
+
+ {
+ LOCK(cs_KeyStore);
+ vMasterKey.clear();
+ }
+
+ NotifyStatusChanged(this);
+ return true;
+}
+
+bool CCryptoKeyStore::Unlock(const CKeyingMaterial& vMasterKeyIn)
+{
+ {
+ LOCK(cs_KeyStore);
+ if (!SetCrypted())
+ return false;
+
+ bool keyPass = false;
+ bool keyFail = false;
+ CryptedKeyMap::const_iterator mi = mapCryptedKeys.begin();
+ for (; mi != mapCryptedKeys.end(); ++mi)
+ {
+ const CPubKey &vchPubKey = (*mi).second.first;
+ const std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
+ CKey key;
+ if (!DecryptKey(vMasterKeyIn, vchCryptedSecret, vchPubKey, key))
+ {
+ keyFail = true;
+ break;
+ }
+ keyPass = true;
+ if (fDecryptionThoroughlyChecked)
+ break;
+ }
+ if (keyPass && keyFail)
+ {
+ LogPrintf("The wallet is probably corrupted: Some keys decrypt but not all.");
+ assert(false);
+ }
+ if (keyFail || !keyPass)
+ return false;
+ vMasterKey = vMasterKeyIn;
+ fDecryptionThoroughlyChecked = true;
+ }
+ NotifyStatusChanged(this);
+ return true;
+}
+
+bool CCryptoKeyStore::AddKeyPubKey(const CKey& key, const CPubKey &pubkey)
+{
+ {
+ LOCK(cs_KeyStore);
+ if (!IsCrypted())
+ return CBasicKeyStore::AddKeyPubKey(key, pubkey);
+
+ if (IsLocked())
+ return false;
+
+ std::vector<unsigned char> vchCryptedSecret;
+ CKeyingMaterial vchSecret(key.begin(), key.end());
+ if (!EncryptSecret(vMasterKey, vchSecret, pubkey.GetHash(), vchCryptedSecret))
+ return false;
+
+ if (!AddCryptedKey(pubkey, vchCryptedSecret))
+ return false;
+ }
+ return true;
+}
+
+
+bool CCryptoKeyStore::AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret)
+{
+ {
+ LOCK(cs_KeyStore);
+ if (!SetCrypted())
+ return false;
+
+ mapCryptedKeys[vchPubKey.GetID()] = make_pair(vchPubKey, vchCryptedSecret);
+ }
+ return true;
+}
+
+bool CCryptoKeyStore::GetKey(const CKeyID &address, CKey& keyOut) const
+{
+ {
+ LOCK(cs_KeyStore);
+ if (!IsCrypted())
+ return CBasicKeyStore::GetKey(address, keyOut);
+
+ CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
+ if (mi != mapCryptedKeys.end())
+ {
+ const CPubKey &vchPubKey = (*mi).second.first;
+ const std::vector<unsigned char> &vchCryptedSecret = (*mi).second.second;
+ return DecryptKey(vMasterKey, vchCryptedSecret, vchPubKey, keyOut);
+ }
+ }
+ return false;
+}
+
+bool CCryptoKeyStore::GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const
+{
+ {
+ LOCK(cs_KeyStore);
+ if (!IsCrypted())
+ return CKeyStore::GetPubKey(address, vchPubKeyOut);
+
+ CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
+ if (mi != mapCryptedKeys.end())
+ {
+ vchPubKeyOut = (*mi).second.first;
+ return true;
+ }
+ }
+ return false;
+}
+
+bool CCryptoKeyStore::EncryptKeys(CKeyingMaterial& vMasterKeyIn)
+{
+ {
+ LOCK(cs_KeyStore);
+ if (!mapCryptedKeys.empty() || IsCrypted())
+ return false;
+
+ fUseCrypto = true;
+ BOOST_FOREACH(KeyMap::value_type& mKey, mapKeys)
+ {
+ const CKey &key = mKey.second;
+ CPubKey vchPubKey = key.GetPubKey();
+ CKeyingMaterial vchSecret(key.begin(), key.end());
+ std::vector<unsigned char> vchCryptedSecret;
+ if (!EncryptSecret(vMasterKeyIn, vchSecret, vchPubKey.GetHash(), vchCryptedSecret))
+ return false;
+ if (!AddCryptedKey(vchPubKey, vchCryptedSecret))
+ return false;
+ }
+ mapKeys.clear();
+ }
+ return true;
+}