C# 中使用 TripleDES 加密的字符串，需要在 PHP 中解密

使用TripleDES算法对字符串进行加密是一种常见的加密方式，它在C#中的实现相对简单。然而，如果我们需要在PHP中对该加密字符串进行解密，则需要注意一些细节。本文将介绍如何在PHP中解密C#中使用TripleDES加密的字符串，并提供相应的示例代码。

csharp
using System;
using System.Security.Cryptography;
using System.Text;
public class TripleDesEncryption
{
    public static string Encrypt(string plainText, string key)
    {
        byte[] keyBytes = Encoding.UTF8.GetBytes(key);
        byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
        using (TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider())
        {
            des.Key = keyBytes;
            des.Mode = CipherMode.ECB;
            des.Padding = PaddingMode.PKCS7;
            using (ICryptoTransform encryptor = des.CreateEncryptor())
            {
                byte[] encryptedBytes = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
                return Convert.ToBase64String(encryptedBytes);
            }
        }
    }
}

php
function decrypt($encryptedText, $key)
{
    $keyBytes = mb_convert_encoding($key, 'UTF-8');
    $encryptedBytes = base64_decode($encryptedText);
    $ivSize = openssl_cipher_iv_length('des-ede3');
    $iv = str_repeat("\0", $ivSize);
    return openssl_decrypt($encryptedBytes, 'des-ede3', $keyBytes, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING, $iv);
}

php
$encryptedText = 'U2FsdGVkX1+7HJf3dQwNqBjGvRn5RZHL+7zYRBrXe8w=';
$key = 'MySecretKey';
$decryptedText = decrypt($encryptedText, $key);
echo $decryptedText;