openssl_decrypt() 用于加密 c#

问题描述

openssl_decrypt() 是链接下已经定义好的函数PHP

https://www.meridianoutpost.com/resources/etools/php-functions/php-openssl-decrypt.php？

我想用c#实现这个功能

因为下面已经在PHP中完成了

 public function decrypt($data,$password)
 {
     $iv = hex2bin(substr($data,16 * 2));
     $data = hex2bin(substr($data,16 * 2));
     $plain_data = openssl_decrypt($data,'aes-256-cbc',$password,true,$iv);
     return $plain_data;
 }

c#

  public static string OpenSSLDecryptNew(string encrypted,string passphrase)
    {
        // base 64 decode
        byte[] encryptedBytesWithSalt = Convert.FromBase64String(encrypted);
        // extract salt (first 8 bytes of encrypted)
        byte[] salt = new byte[8];
        byte[] encryptedBytes = new byte[encryptedBytesWithSalt.Length - salt.Length - 8];
        Buffer.Blockcopy(encryptedBytesWithSalt,8,salt,salt.Length);
        Buffer.Blockcopy(encryptedBytesWithSalt,salt.Length + 8,encryptedBytes,encryptedBytes.Length);
        // get key and iv
        byte[] key,iv;
        DeriveKeyAndIV(passphrase,out key,out iv);
        return DecryptStringFromByteSAEs(encryptedBytes,key,iv);
    }

    private static void DeriveKeyAndIV(string passphrase,byte[] salt,out byte[] key,out byte[] iv)
    {
        // generate key and iv
        List<byte> concatenatedHashes = new List<byte>(48);

        byte[] password = Encoding.UTF8.GetBytes(passphrase);
        byte[] currentHash = new byte[0];
        MD5 md5 = MD5.Create();
        bool enoughBytesForKey = false;
        // See http://www.openssl.org/docs/crypto/EVP_BytesToKey.html#KEY_DERIVATION_ALGORITHM
        while (!enoughBytesForKey)
        {
            int preHashLength = currentHash.Length + password.Length + salt.Length;
            byte[] preHash = new byte[preHashLength];

            Buffer.Blockcopy(currentHash,preHash,currentHash.Length);
            Buffer.Blockcopy(password,currentHash.Length,password.Length);
            Buffer.Blockcopy(salt,currentHash.Length + password.Length,salt.Length);

            currentHash = md5.ComputeHash(preHash);
            concatenatedHashes.AddRange(currentHash);

            if (concatenatedHashes.Count >= 48)
                enoughBytesForKey = true;
        }

        key = new byte[32];
        iv = new byte[16];
        concatenatedHashes.copyTo(0,32);
        concatenatedHashes.copyTo(32,iv,16);

        md5.Clear();
    }

    static string DecryptStringFromByteSAEs(byte[] cipherText,byte[] key,byte[] iv)
    {
        // Check arguments.
        if (cipherText == null || cipherText.Length <= 0)
            throw new ArgumentNullException("cipherText");
        if (key == null || key.Length <= 0)
            throw new ArgumentNullException("key");
        if (iv == null || iv.Length <= 0)
            throw new ArgumentNullException("iv");

        // Declare the RijndaelManaged object
        // used to decrypt the data.
        RijndaelManaged aesAlg = null;

        // Declare the string used to hold
        // the decrypted text.
        string plaintext;

        // Create a RijndaelManaged object
        // with the specified key and IV.
        aesAlg = new RijndaelManaged { Mode = CipherMode.CBC,Padding = PaddingMode.None,KeySize = 256,BlockSize = 128,Key = key,IV = iv };

        // Create a decrytor to perform the stream transform.
        ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key,aesAlg.IV);
        // Create the streams used for decryption.
        using (MemoryStream msDecrypt = new MemoryStream(cipherText))
        {
            using (CryptoStream csDecrypt = new CryptoStream(msDecrypt,decryptor,CryptoStreamMode.Read))
            {
                using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                {
                    // Read the decrypted bytes from the decrypting stream
                    // and place them in a string.
                    plaintext = srDecrypt.ReadToEnd();
                    srDecrypt.Close();
                }
            }
        }

        return plaintext;
    }

请参考上面的代码，c#以与openssl_decrypt相同的方式解密，我在问是否会基于c#和PHP产生相同的结果，是否有任何c#代码返回与PHP中openssl_decrypt()相同的行为>

解决方法

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