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- // ECOin - Copyright (c) - 2014/2021 - GPLv3 - epsylon@riseup.net (https://03c8.net)
- #include <openssl/aes.h>
- #include <openssl/evp.h>
- #include <vector>
- #include <string>
- #ifdef WIN32
- #include <windows.h>
- #endif
- #include "crypter.h"
- #include "scrypt.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 (nDerivationMethod == 1)
- {
- uint256 scryptHash = scrypt_salted_multiround_hash((const void*)strKeyData.c_str(), strKeyData.size(), &chSalt[0], 8, nRounds);
- i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha512(), &chSalt[0],
- (unsigned char *)&scryptHash, sizeof scryptHash, nRounds, chKey, chIV);
- OPENSSL_cleanse(&scryptHash, sizeof scryptHash);
- }
- if (i != (int)WALLET_CRYPTO_KEY_SIZE)
- {
- OPENSSL_cleanse(&chKey, sizeof chKey);
- OPENSSL_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;
- 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);
- if (fOk) fOk = EVP_EncryptUpdate(&ctx, &vchCiphertext[0], &nCLen, &vchPlaintext[0], nLen);
- if (fOk) fOk = EVP_EncryptFinal_ex(&ctx, (&vchCiphertext[0])+nCLen, &nFLen);
- 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;
- 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);
- if (fOk) fOk = EVP_DecryptUpdate(&ctx, &vchPlaintext[0], &nPLen, &vchCiphertext[0], nLen);
- if (fOk) fOk = EVP_DecryptFinal_ex(&ctx, (&vchPlaintext[0])+nPLen, &nFLen);
- EVP_CIPHER_CTX_cleanup(&ctx);
- if (!fOk) return false;
- vchPlaintext.resize(nPLen + nFLen);
- return true;
- }
- bool EncryptSecret(CKeyingMaterial& vMasterKey, const CSecret &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((CKeyingMaterial)vchPlaintext, vchCiphertext);
- }
- bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCiphertext, const uint256& nIV, CSecret& 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));
- }
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