C# RSA Encrypt -> PHP RSA Decrypt

Question

Я пытаюсь склеить AES Key и IV с RSA на C# и расшифровать их с помощью PHP с помощью phpseclib. Я попытался исправить эту проблему около 4 часов, но всегда получаю «Ошибка дешифрования в строке 2495». Кажется, что-то не так с PKCS.

Временный закрытый ключ

<?php define("RSA_Private", "-----BEGIN RSA PRIVATE KEY----- MIICWwIBAAKBgQC/JPkdbqnnCTsfEbFlx/3bj+RP9wTdAh+f0Ndi55R4qBcrAIUv 1jTedYRkciAHIGSZgB2McymAuYzUtYW+22arD/ET/DiwwTP/+YPEJYenU2Zbfirb 2bO6yXzfTf9cpctWxx4k6MeVDXIQsZv5sUiFvSl8auNNzp22QVIH19tDlwIDAQAB AoGAV62wD84pZW8YjYHiK9v3GHYCtqOKuY41z2tOwXGU61u/dNxCO9U4Xyrs1d57 zokPXFImO7y/tupmLVQuy4N8rgO0BqB2t3YETpOlwmOF4CYl0Lkoa5mlQ1XvBXoU qbNU33UlJUNheLT0UM7lhwwnBTqNlfC1/bNXL8TYCsyt+KECQQDstdKRaip8YH20 DgB2301/91pCTAkw/vXEPi8GBVq4EN/hWSwpz+hDrJrbmSBnTkQ2IlWvYy3nghGB g/QwTaZ/AkEAzriR/Snqfif2fpSovp0ln8/A0AR0utq1FfvYWMkT9woqPR5iJjS7 ZcVX1U9ayC4fPypMz/BXafy9MGstllhG6QJAakZ387GmwZDQ3zYqHzTCpuF3NKzO s6DE1wbUNe/RezKYUaSnn14o+blVDaMCWV9aYLOppMTypy5Ojcegqs8yIQJADXjL 0tLbfFNAZilsAdgd7pdMeoH/1XmRWZhrFgYsrenUrN0BCnpfSBefTMB6KxeOY8Bu 9xIzsC2PasthUi34mQJAV5IvcjaOiMSed28LegOHTBXP5Qpu96GQGneD3x92AtM+ aRhEjMeoadetA0JQcPRJgVXTov5wir5xeCEUjpplGg== -----END RSA PRIVATE KEY-----");?> 

Temporary Public Key

<?php define("RSA_Public", "-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC/JPkdbqnnCTsfEbFlx/3bj+RP 9wTdAh+f0Ndi55R4qBcrAIUv1jTedYRkciAHIGSZgB2McymAuYzUtYW+22arD/ET /DiwwTP/+YPEJYenU2Zbfirb2bO6yXzfTf9cpctWxx4k6MeVDXIQsZv5sUiFvSl8 auNNzp22QVIH19tDlwIDAQAB -----END PUBLIC KEY-----");?> 

гипертекст после шифрования RSA в C# (расшифрованного = "TestKey", потому что я удалил шифрования AES для тестирования)

Cd/RsiVqKnEP2T9oTgnvRuHVKY09VfynLHIlinIGtW4PFrB2kKffIrIqRQKhob6bPIR4efjxhCn43AQ2gE5P/AMG/EDWk9HMJF8XuhdtsWfPmnqxVV4crpA2FZwh4BWdXq4N70ieWbuk+pRJ1dHGhLgFfphp4sVVopn3bPKw2VKI0O+MT4nUCHFac25owoFnMULzuxj60I9Qa/TIlCKwMNcv2r7ili/LvplPZIEnH2p/bR62TAUvty0yo9NTHZm+wlqyIUmA1/GrM0VHjmcnRjFQHp1zQreRspvRsbk= 

PHP (без изменений, если strrev или нет):

public function RSADecryption($key, $iv) { 
    $PrivateKeyFile = RSA_Private; 
    $rsa = new Crypt_RSA(); 
    $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1); 
    $rsa->loadKey($PrivateKeyFile); 
    // decrypt key and iv for aes decryption 
    $aes_key = base64_encode($rsa->decrypt(strrev((base64_decode($key))))); 
    $aes_iv = base64_encode($rsa->decrypt(base64_decode($iv))); 
    echo $aes_key; 
    echo "<br />"; 
    echo $aes_iv; 
} 

C# Шифрование:

public static string RSAEncryption(string aes_key, string aes_iv, string publickey) 
    { 
     if (publickey.Contains("-----")) 
     { 
      // Get public key without -----.... 
      publickey = publickey.Split(new string[] { "-----" }, StringSplitOptions.RemoveEmptyEntries)[1]; 
     } 

     // Remove "new line" characters 
     publickey.Replace("\n", ""); 
     byte[] KeyToEncrypt = Encoding.Default.GetBytes(aes_key); 
     byte[] IVToEncrypt = Encoding.Default.GetBytes(aes_iv); 
     byte[] PublicKey = Encoding.Default.GetBytes(publickey); 

     //Values to store encrypted symmetric keys. 
     byte[] EncryptedKey; 
     byte[] EncryptedIV; 

     //Create a new instance of RSACryptoServiceProvider. 
     RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); 

     //Get an instance of RSAParameters from ExportParameters function. 
     RSAParameters RSAKeyInfo = RSA.ExportParameters(false); 

     //Set RSAKeyInfo to the public key values. 
     RSAKeyInfo.Modulus = PublicKey; 
     //Import key parameters into RSA. 
     RSA.ImportParameters(RSAKeyInfo); 

     //Encrypt the symmetric key and IV. 
     EncryptedKey = RSA.Encrypt(KeyToEncrypt, false); 
     EncryptedIV = RSA.Encrypt(IVToEncrypt, false); 
     System.IO.File.WriteAllText(@"C:\WriteTextCryptKey.txt", Convert.ToBase64String(EncryptedKey)); 
     System.IO.File.WriteAllText(@"C:\WriteTextCryptIV.txt", Convert.ToBase64String(EncryptedIV)); 
     return Convert.ToBase64String(EncryptedKey); 
    } 

Функция дозвонились в phpseclib:

function _rsaes_pkcs1_v1_5_decrypt($c) 
{ 
    // Length checking 

    if (strlen($c) != $this->k) { // or if k < 11 
     user_error('Decryption error'); 
     return false; 
    } 

    // RSA decryption 

    $c = $this->_os2ip($c); 
    $m = $this->_rsadp($c); 

    if ($m === false) { 
     user_error('Decryption error'); 
     return false; 
    } 
    $em = $this->_i2osp($m, $this->k); 

    // EME-PKCS1-v1_5 decoding 

    if (ord($em[0]) != 0 || ord($em[1]) > 2) { 
     user_error('Decryption error'); 
     return false; 
    } 

    $ps = substr($em, 2, strpos($em, chr(0), 2) - 2); 
    $m = substr($em, strlen($ps) + 3); 

    if (strlen($ps) < 8) { 
     user_error('Decryption error'); 
     return false; 
    } 

    // Output M 

    return $m; 
} 

if (ord($em[0]) != 0 || ord($em[1]) > 2) является линия 2495

Answer 1

Решение:

C#:

public static string RSAEncryption(string aes_key, string aes_iv) 
    { 
     //encode key and iv to byte array 
     byte[] KeyToEncrypt = Encoding.Default.GetBytes(aes_key); 
     byte[] IVToEncrypt = Encoding.Default.GetBytes(aes_iv); 

     //get RSA public key from xml file 
     TextReader reader = new StreamReader("publicKey.xml"); 
     string publicKey = reader.ReadToEnd(); 
     reader.Close(); 
     MessageBox.Show(publicKey); 

     //Values to store encrypted symmetric keys. 
     byte[] EncryptedKey; 
     byte[] EncryptedIV; 

     //Create a new instance of RSACryptoServiceProvider. 
     RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); 

     //set xml string as public key 
     RSA.FromXmlString(publicKey); 

     //Encrypt the symmetric key and IV. 
     EncryptedKey = RSA.Encrypt(KeyToEncrypt, false); 
     EncryptedIV = RSA.Encrypt(IVToEncrypt, false); 
     System.IO.File.WriteAllText(@"C:\WriteTextCryptKey.txt", Convert.ToBase64String(EncryptedKey)); 
     System.IO.File.WriteAllText(@"C:\WriteTextCryptIV.txt", Convert.ToBase64String(EncryptedIV)); 
     return Convert.ToBase64String(EncryptedKey); 
    } 

PHP:

public function RSADecryption($key, $iv) { 
    $PrivateKeyFile = RSA_Private; 
    $rsa = new Crypt_RSA(); 
    $rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1); 
    $rsa->loadKey($PrivateKeyFile); //private key in xml 
    // decrypt key and iv for aes decryption 
    $aes_key = $rsa->decrypt(base64_decode($key)); 
    $aes_iv = $rsa->decrypt(base64_decode($iv)); 
}