C # RSA Encrypt — & gt; PHP RSA Расшифровать

Question

C # RSA Encrypt — & gt; PHP RSA Расшифровать

Я пытаюсь зашифровать AES Key и IV с помощью RSA в C # и расшифровать их с помощью PHP с помощью phpseclib. Я пытался решить эту проблему около 4 часов, но всегда получаю сообщение «Ошибка расшифровки 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-----");?>

Временный открытый ключ

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

Зашифрованный текст после шифрования RSA в C # (decrypted = «testkey», потому что я удалил шифрование 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 вызывается 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) это строка 2495

1

c#cryptography encryption php phpseclib

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Accepted Answer

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));
}

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