从Node.js的解密AES2​​56加密的数据在.NET中 - 如何获得密码IV和密钥 [英] Decrypting AES256 encrypted data in .NET from node.js - how to obtain IV and Key from passphrase

问题描述

我有以下的code加密/解密Node.js的数据，这是工作的：

I have the following code to encrypt/decrypt data in node.js, which is working:

var cipher = crypto.createCipher('aes256', 'passphrase');  
var encrypted = cipher.update("test", 'utf8', 'base64') + cipher.final('base64');

var decipher = crypto.createDecipher('aes256', 'passphrase');   
var plain = decipher.update(encrypted, 'base64', 'utf8') + decipher.final('utf8');

我希望能够做同样的在C＃/。NET，这样我可以分享两个独立的系统之间的数据。然而，code，我已经看到在.NET需要一个密钥和四entrypt /解密。如何在Node.js的加密库，这些源自密码？

I would like to be able to do the same in C#/.NET so that I can share data between two seperate systems. However the code that I have seen in .NET requires a Key and IV to entrypt/decrypt. How are these derived from the passphrase in the node.js Crypto library?

推荐答案

从的 Node.js的源我发现这一点：

 bool CipherInit(char* cipherType, char* key_buf, int key_buf_len) {
cipher = EVP_get_cipherbyname(cipherType);
if(!cipher) {
  fprintf(stderr, "node-crypto : Unknown cipher %s\n", cipherType);
  return false;
}

unsigned char key[EVP_MAX_KEY_LENGTH],iv[EVP_MAX_IV_LENGTH];
int key_len = EVP_BytesToKey(cipher, EVP_md5(), NULL,
  (unsigned char*) key_buf, key_buf_len, 1, key, iv);

我发现C＃实现EVP_BytesToKey的<一个href="http://stackoverflow.com/questions/8008253/c-sharp-version-of-openssl-evp-bytestokey-method">this问题可以使用这样的：

byte[] key, iv;
DeriveKeyAndIV(Encoding.ASCII.GetBytes("passphrase"),null, 1, out key, out iv);

                     //this is what node.js gave me as the base64 encrypted data
var encrytedBytes = Convert.FromBase64String("b3rbg+mniw7p9aiPUyGthg==");

键和IV然后可以在 RijndaelManaged的的实例用来解密 encrytedBytes

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