diff options
Diffstat (limited to 'src/crypter.h')
| -rw-r--r-- | src/crypter.h | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/src/crypter.h b/src/crypter.h deleted file mode 100644 index 32746b00df..0000000000 --- a/src/crypter.h +++ /dev/null @@ -1,196 +0,0 @@ -// Copyright (c) 2009-2014 The Bitcoin Core developers -// Distributed under the MIT software license, see the accompanying -// file COPYING or http://www.opensource.org/licenses/mit-license.php. - -#ifndef BITCOIN_CRYPTER_H -#define BITCOIN_CRYPTER_H - -#include "keystore.h" -#include "serialize.h" -#include "support/allocators/secure.h" - -class uint256; - -const unsigned int WALLET_CRYPTO_KEY_SIZE = 32; -const unsigned int WALLET_CRYPTO_SALT_SIZE = 8; - -/** - * Private key encryption is done based on a CMasterKey, - * which holds a salt and random encryption key. - * - * CMasterKeys are encrypted using AES-256-CBC using a key - * derived using derivation method nDerivationMethod - * (0 == EVP_sha512()) and derivation iterations nDeriveIterations. - * vchOtherDerivationParameters is provided for alternative algorithms - * which may require more parameters (such as scrypt). - * - * Wallet Private Keys are then encrypted using AES-256-CBC - * with the double-sha256 of the public key as the IV, and the - * master key's key as the encryption key (see keystore.[ch]). - */ - -/** Master key for wallet encryption */ -class CMasterKey -{ -public: - std::vector<unsigned char> vchCryptedKey; - std::vector<unsigned char> vchSalt; - //! 0 = EVP_sha512() - //! 1 = scrypt() - unsigned int nDerivationMethod; - unsigned int nDeriveIterations; - //! Use this for more parameters to key derivation, - //! such as the various parameters to scrypt - std::vector<unsigned char> vchOtherDerivationParameters; - - ADD_SERIALIZE_METHODS; - - template <typename Stream, typename Operation> - inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) { - READWRITE(vchCryptedKey); - READWRITE(vchSalt); - READWRITE(nDerivationMethod); - READWRITE(nDeriveIterations); - READWRITE(vchOtherDerivationParameters); - } - - CMasterKey() - { - // 25000 rounds is just under 0.1 seconds on a 1.86 GHz Pentium M - // ie slightly lower than the lowest hardware we need bother supporting - nDeriveIterations = 25000; - nDerivationMethod = 0; - vchOtherDerivationParameters = std::vector<unsigned char>(0); - } -}; - -typedef std::vector<unsigned char, secure_allocator<unsigned char> > CKeyingMaterial; - -/** Encryption/decryption context with key information */ -class CCrypter -{ -private: - unsigned char chKey[WALLET_CRYPTO_KEY_SIZE]; - unsigned char chIV[WALLET_CRYPTO_KEY_SIZE]; - bool fKeySet; - -public: - bool SetKeyFromPassphrase(const SecureString &strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod); - bool Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext); - bool Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext); - bool SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigned char>& chNewIV); - - void CleanKey() - { - memory_cleanse(chKey, sizeof(chKey)); - memory_cleanse(chIV, sizeof(chIV)); - fKeySet = false; - } - - CCrypter() - { - fKeySet = false; - - // 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) - // Note that this does nothing about suspend-to-disk (which will put all our key data on disk) - // 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. - LockedPageManager::Instance().LockRange(&chKey[0], sizeof chKey); - LockedPageManager::Instance().LockRange(&chIV[0], sizeof chIV); - } - - ~CCrypter() - { - CleanKey(); - - LockedPageManager::Instance().UnlockRange(&chKey[0], sizeof chKey); - LockedPageManager::Instance().UnlockRange(&chIV[0], sizeof chIV); - } -}; - -/** Keystore which keeps the private keys encrypted. - * It derives from the basic key store, which is used if no encryption is active. - */ -class CCryptoKeyStore : public CBasicKeyStore -{ -private: - CryptedKeyMap mapCryptedKeys; - - CKeyingMaterial vMasterKey; - - //! if fUseCrypto is true, mapKeys must be empty - //! if fUseCrypto is false, vMasterKey must be empty - bool fUseCrypto; - - //! keeps track of whether Unlock has run a thorough check before - bool fDecryptionThoroughlyChecked; - -protected: - bool SetCrypted(); - - //! will encrypt previously unencrypted keys - bool EncryptKeys(CKeyingMaterial& vMasterKeyIn); - - bool Unlock(const CKeyingMaterial& vMasterKeyIn); - -public: - CCryptoKeyStore() : fUseCrypto(false), fDecryptionThoroughlyChecked(false) - { - } - - bool IsCrypted() const - { - return fUseCrypto; - } - - bool IsLocked() const - { - if (!IsCrypted()) - return false; - bool result; - { - LOCK(cs_KeyStore); - result = vMasterKey.empty(); - } - return result; - } - - bool Lock(); - - virtual bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret); - bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey); - bool HaveKey(const CKeyID &address) const - { - { - LOCK(cs_KeyStore); - if (!IsCrypted()) - return CBasicKeyStore::HaveKey(address); - return mapCryptedKeys.count(address) > 0; - } - return false; - } - bool GetKey(const CKeyID &address, CKey& keyOut) const; - bool GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const; - void GetKeys(std::set<CKeyID> &setAddress) const - { - if (!IsCrypted()) - { - CBasicKeyStore::GetKeys(setAddress); - return; - } - 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 |