C# 使用 RSA 加密 PHP 解密

Question

我正在尝试在 C# 和 PHP 之间构建一个简单的 RSA 加密解密过程。我已经使用 phpseclib( http://phpseclib.sourceforge.net/ ) 在 PHP 中完成了加密，在 C# 中完成了解密。但是我越来越“第 2103 行 C:\xampp\htdocs\Crypt\RSA.php 中的解密错误”这是这部分:

if ($lHash != $lHash2) {
        user_error('Decryption error', E_USER_NOTICE);
        return false;
    }

C#中的加密我用了这串代码:

RSACryptoServiceProvider rsaCryptoServiceProvider = new RSACryptoServiceProvider(dwKeySize);
        rsaCryptoServiceProvider.FromXmlString(publickey);
        int keySize = dwKeySize / 8;
        byte[] bytes = Encoding.UTF32.GetBytes(inputString);
        // The hash function in use by the .NET RSACryptoServiceProvider here is SHA1
        // int maxLength = ( keySize ) - 2 - ( 2 * SHA1.Create().ComputeHash( rawBytes ).Length );
        int maxLength = keySize - 42;
        int dataLength = bytes.Length;
        int iterations = dataLength / maxLength;
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i <= iterations; i++)
        {
            byte[] tempBytes = new byte[(dataLength - maxLength * i > maxLength) ? maxLength : dataLength - maxLength * i];
            Buffer.BlockCopy(bytes, maxLength * i, tempBytes, 0, tempBytes.Length);
            byte[] encryptedBytes = rsaCryptoServiceProvider.Encrypt(tempBytes, true);
            // Be aware the RSACryptoServiceProvider reverses the order of encrypted bytes after encryption and before decryption.
            // If you do not require compatibility with Microsoft Cryptographic API (CAPI) and/or other vendors.
            // Comment out the next line and the corresponding one in the DecryptString function.
            Array.Reverse(encryptedBytes);
            // Why convert to base 64?
            // Because it is the largest power-of-two base printable using only ASCII characters
            stringBuilder.Append(Convert.ToBase64String(encryptedBytes));
        }
        string ciphertext = stringBuilder.ToString();

和我要解密的基本 PHP 代码:

$rsa->loadKeyfromXML($privatekey);  
$ciphertext = file_get_contents('cipher.txt');
$ciphertext = base64_decode(strrev($ciphertext));

//$rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);

$plaintext = $rsa->decrypt($ciphertext);

我已经尝试过 PKC1，它还在 Crypt/RSA.php 中给出了另一个错误

Answer 1

是的，我刚刚自己找到了解决方案。我更改了加密行:

byte[] bytes = Encoding.UTF32.GetBytes(inputString);  ==> byte[] bytes = Encoding.Default.GetBytes(inputString);

也正如@Ryan所说:

$ciphertext = base64_decode(strrev($ciphertext));  ==> $ciphertext = strrev(base64_decode($ciphertext));

感谢您的尝试。