在PHP中使用C＃解密编码为3DES的字符串 [英] Decrypting in PHP a string encoded 3DES with C#

问题描述

我必须用PHP解密使用此C＃类编码的字符串（它是此处）

I have to decrypt in PHP a string encoded with this C# class (it's here)

using System;
using System.Security.Cryptography;
using System.Text;

public static class Encryption
{
   public static string Encrypt(string input, string key)
   {
      byte[] inputArray = UTF8Encoding.UTF8.GetBytes(input);
      TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
      tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
      tripleDES.Mode = CipherMode.ECB;
      tripleDES.Padding = PaddingMode.PKCS7;
      ICryptoTransform cTransform = tripleDES.CreateEncryptor();
      byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
      tripleDES.Clear();
      return Convert.ToBase64String(resultArray, 0, resultArray.Length);
   }

   public static string Decrypt(string input, string key)
   {
      byte[] inputArray = Convert.FromBase64String(input);
      TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
      tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
      tripleDES.Mode = CipherMode.ECB;
      tripleDES.Padding = PaddingMode.PKCS7;
      ICryptoTransform cTransform = tripleDES.CreateDecryptor();
      byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
      tripleDES.Clear();
      return UTF8Encoding.UTF8.GetString(resultArray);
   }
}

我尝试了在网络上找到的其他示例，但没有似乎有效。我认为第一个问题与php mcrypt_generic_init中的$ iv参数有关，然后另一个问题与php函数中缺少的填充有关。
您能帮我在PHP中转换上面的c＃Decrypt函数吗？
谢谢。

I've tried different examples found around on the web, but nothing seems to work. I think that the first problems comes with the $iv parameter in php mcrypt_generic_init and then another problem comes with padding that is missing in php functions. Can you please help me to convert the c# Decrypt function above in PHP? Thank you.

推荐答案

即使我今天也尝试使用PHP和C＃代码

Even I tried today code for both PHP and C#

<?php
$key64 = "YOUR_KEY";
$iv64 = "YOUR_IV";


$keybytes = base64_decode($key64);
$ivbytes = base64_decode($iv64);

$text = ("4111111111111111");

// Padding the text
$padding = strlen($text)%8;
for($i=$padding; $i<8; $i++){
   $text .= chr(8-$padding);
}

$decryptRaw = mcrypt_encrypt(MCRYPT_3DES, $keybytes, $text, MCRYPT_MODE_CBC, $ivbytes);
$encoded = base64_encode($decryptRaw);

print "$encoded<br/>";
$encryptedString64 = $encoded;
$decryptbytes = base64_decode($encryptedString64);

$decryptRaw = mcrypt_decrypt(MCRYPT_3DES, $keybytes, $decryptbytes, MCRYPT_MODE_CBC, $ivbytes);
$decryptString=trim($decryptRaw,"\x00..\x1F");
print "$decryptString<br/>";

?>

C＃

private string Decrypt(string encryptedValue)
{
    SymmetricAlgorithm tripleDESKey = SymmetricAlgorithm.Create("TripleDES") ;
    tripleDESKey.Key = Convert.FromBase64String("YOUR_KEY");
    tripleDESKey.IV = Convert.FromBase64String("YOUR_IV") ;

    MemoryStream encryptedStream = new MemoryStream();
    encryptedStream.Write(Convert.FromBase64String(encryptedValue), 0,
    Convert.FromBase64String(encryptedValue).Length);
    encryptedStream.Position = 0;
    CryptoStream cs = new CryptoStream(encryptedStream,
    tripleDESKey.CreateDecryptor(), CryptoStreamMode.Read);
    MemoryStream decryptedStream = new MemoryStream();

    byte[] buf = new byte[2049];
    int bytesRead = 0;
    bytesRead = cs.Read(buf, 0, buf.Length);
    while ((bytesRead > 0))
    {
        decryptedStream.Write(buf, 0, bytesRead);
        bytesRead = cs.Read(buf, 0, buf.Length);
    }
    return Encoding.ASCII.GetString(decryptedStream.ToArray());
}
private string Encrypt(string encrypt)
{
    SymmetricAlgorithm sa = SymmetricAlgorithm.Create("TripleDES") ;
    sa.Key = Convert.FromBase64String("YOUR_KEY");
    sa.IV = Convert.FromBase64String("YOUR_IV") ;
    byte[] inputByteArray = Encoding.ASCII.GetBytes(encrypt);
    MemoryStream mS = new MemoryStream();
    ICryptoTransform trans = sa.CreateEncryptor();
    byte[] buf = new byte[2049];
    CryptoStream cs = new CryptoStream(mS, trans, CryptoStreamMode.Write);
    cs.Write(inputByteArray, 0, inputByteArray.Length);
    cs.FlushFinalBlock();
    return Convert.ToBase64String(mS.ToArray());
}

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