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- // ECOin - Copyright (c) - 2014/2021 - GPLv3 - epsylon@riseup.net (https://03c8.net)
- #ifndef __CRYPTER_H__
- #define __CRYPTER_H__
- #include "allocators.h" /* for SecureString */
- #include "key.h"
- #include "serialize.h"
- const unsigned int WALLET_CRYPTO_KEY_SIZE = 32;
- const unsigned int WALLET_CRYPTO_SALT_SIZE = 8;
- class CMasterKey
- {
- public:
- std::vector<unsigned char> vchCryptedKey;
- std::vector<unsigned char> vchSalt;
- // 0 = EVP_sha512()
- // 1 = scrypt()
- unsigned int nDerivationMethod;
- unsigned int nDeriveIterations;
- std::vector<unsigned char> vchOtherDerivationParameters;
- IMPLEMENT_SERIALIZE
- (
- 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 = 1;
- vchOtherDerivationParameters = std::vector<unsigned char>(0);
- }
- CMasterKey(unsigned int nDerivationMethodIndex)
- {
- switch (nDerivationMethodIndex)
- {
- case 0: // sha512
- default:
- nDeriveIterations = 25000;
- nDerivationMethod = 0;
- vchOtherDerivationParameters = std::vector<unsigned char>(0);
- break;
- case 1: // scrypt+sha512
- nDeriveIterations = 10000;
- nDerivationMethod = 1;
- vchOtherDerivationParameters = std::vector<unsigned char>(0);
- break;
- }
- }
- };
- typedef std::vector<unsigned char, secure_allocator<unsigned char> > CKeyingMaterial;
- 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()
- {
- OPENSSL_cleanse(&chKey, sizeof chKey);
- OPENSSL_cleanse(&chIV, sizeof chIV);
- fKeySet = false;
- }
- CCrypter()
- {
- fKeySet = false;
- 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);
- }
- };
- bool EncryptSecret(CKeyingMaterial& vMasterKey, const CSecret &vchPlaintext, const uint256& nIV, std::vector<unsigned char> &vchCiphertext);
- bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char> &vchCiphertext, const uint256& nIV, CSecret &vchPlaintext);
- #endif
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