1 files changed, 302 insertions, 0 deletions
diff --git a/src/wallet/crypter.cpp b/src/wallet/crypter.cpp
new file mode 100644
index 000000000..190f8ecf2
--- /dev/null
+++ b/src/wallet/crypter.cpp
@@ -0,0 +1,302 @@
+// Copyright (c) 2009-2015 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 "crypto/aes.h"
+#include "crypto/sha512.h"
+#include "script/script.h"
+#include "script/standard.h"
+#include "util.h"
+
+#include <string>
+#include <vector>
+#include <boost/foreach.hpp>
+
+int CCrypter::BytesToKeySHA512AES(const std::vector<unsigned char>& chSalt, const SecureString& strKeyData, int count, unsigned char *key,unsigned char *iv) const
+{
+    // This mimics the behavior of openssl's EVP_BytesToKey with an aes256cbc
+    // cipher and sha512 message digest. Because sha512's output size (64b) is
+    // greater than the aes256 block size (16b) + aes256 key size (32b),
+    // there's no need to process more than once (D_0).
+
+    if(!count || !key || !iv)
+        return 0;
+
+    unsigned char buf[CSHA512::OUTPUT_SIZE];
+    CSHA512 di;
+
+    di.Write((const unsigned char*)strKeyData.c_str(), strKeyData.size());
+    if(chSalt.size())
+        di.Write(&chSalt[0], chSalt.size());
+    di.Finalize(buf);
+
+    for(int i = 0; i != count - 1; i++)
+        di.Reset().Write(buf, sizeof(buf)).Finalize(buf);
+
+    memcpy(key, buf, WALLET_CRYPTO_KEY_SIZE);
+    memcpy(iv, buf + WALLET_CRYPTO_KEY_SIZE, WALLET_CRYPTO_IV_SIZE);
+    memory_cleanse(buf, sizeof(buf));
+    return WALLET_CRYPTO_KEY_SIZE;
+}
+
+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 = BytesToKeySHA512AES(chSalt, strKeyData, 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_IV_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) const
+{
+    if (!fKeySet)
+        return false;
+
+    // max ciphertext len for a n bytes of plaintext is
+    // n + AES_BLOCKSIZE bytes
+    vchCiphertext.resize(vchPlaintext.size() + AES_BLOCKSIZE);
+
+    AES256CBCEncrypt enc(chKey, chIV, true);
+    size_t nLen = enc.Encrypt(&vchPlaintext[0], vchPlaintext.size(), &vchCiphertext[0]);
+    if(nLen < vchPlaintext.size())
+        return false;
+    vchCiphertext.resize(nLen);
+
+    return true;
+}
+
+bool CCrypter::Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext) const
+{
+    if (!fKeySet)
+        return false;
+
+    // plaintext will always be equal to or lesser than length of ciphertext
+    int nLen = vchCiphertext.size();
+
+    vchPlaintext.resize(nLen);
+
+    AES256CBCDecrypt dec(chKey, chIV, true);
+    nLen = dec.Decrypt(&vchCiphertext[0], vchCiphertext.size(), &vchPlaintext[0]);
+    if(nLen == 0)
+        return false;
+    vchPlaintext.resize(nLen);
+    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_IV_SIZE);
+    memcpy(&chIV[0], &nIV, WALLET_CRYPTO_IV_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_IV_SIZE);
+    memcpy(&chIV[0], &nIV, WALLET_CRYPTO_IV_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.\n");
+            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 CBasicKeyStore::GetPubKey(address, vchPubKeyOut);
+
+        CryptedKeyMap::const_iterator mi = mapCryptedKeys.find(address);
+        if (mi != mapCryptedKeys.end())
+        {
+            vchPubKeyOut = (*mi).second.first;
+            return true;
+        }
+        // Check for watch-only pubkeys
+        return CBasicKeyStore::GetPubKey(address, vchPubKeyOut);
+    }
+    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;
+}