bool OldDecrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext, const unsigned char chKey[32], const unsigned char chIV[16]) { // 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 = EVP_CIPHER_CTX_new(); if (!ctx) return false; 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); EVP_CIPHER_CTX_free(ctx); if (!fOk) return false; vchPlaintext.resize(nPLen + 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); 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 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); bool fOk = true; EVP_CIPHER_CTX *ctx= EVP_CIPHER_CTX_new(); if(!ctx) throw std::runtime_error("Error allocating cipher context"); 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_free(ctx); if (!fOk) return false; vchPlaintext.resize(nPLen + nFLen); 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(vchKey.data(), vchIV.data(), true); nLen = dec.Decrypt(vchCiphertext.data(), vchCiphertext.size(), &vchPlaintext[0]); if(nLen == 0) return false; vchPlaintext.resize(nLen); return true; }