Question

I am trying to decrypt the data using private key. I was able to decrypt the key using RSA and private key. Now I would like to decrypt the data using the decrypted key. The data was encrypted the values using AES and random session secret using PHP. Could you please let me know if there are any examples?

这里是我迄今为止制定的准则。

    static void Main(string[] args)
    {
           AsymmetricCipherKeyPair keyPair;

        string protectedSecret = "U6XksFkhWV4.......eo3fRg==";
        var decodedSecret = Convert.FromBase64String(protectedSecret);

        string iv = "KLnP....wA==";
        var decodedIV = Convert.FromBase64String(iv);

        using (var reader = File.OpenText(@"c:\private.key")) 
            keyPair = (AsymmetricCipherKeyPair)new PemReader(reader).ReadObject();

        var decryptPKIEngine = new Pkcs1Encoding(new RsaEngine());
        decryptPKIEngine.Init(false, keyPair.Private);

        var secret = Encoding.UTF8.GetString(decryptPKIEngine.ProcessBlock(decodedSecret, 0, decodedSecret.Length));

        var  protectedData = Convert.FromBase64String("f8..Po=");
      }

Answer 1

创建<代码>RijndaelManaged. 例,并将其Key和IV贴在您的外围阵列上。

Then, create a CryptoStream from CreateDecryptor() wrapping a MemoryStream with your ciphertext byte array.
Finally, read the plaintext from the CryptoStream. (if it s actual text, you may want to use a StreamReader)

Answer 2

Try this replace put the necessary strings where needed

static string PHPDecrypt() 
    {            
      byte[] keyBytes = Convert.FromBase64String("U6XksFkhWV4.......eo3fRg=="); //put in your real values here and below for iv and cipherTextBytes
      byte[] iv = Convert.FromBase64String("KLnP....wA=="");
      byte[] cipherTextBytes = Convert.FromBase64String("Put the EncryptedText here");

      var symmetricKey = new RijndaelManaged 
      { 
         Mode = CipherMode.CBC, 
         IV = iv, KeySize = 256, 
         Key = keyBytes, 
         Padding = PaddingMode.Zeros
      };

      using (var decryptor = symmetricKey.CreateDecryptor())
      using (var ms = new MemoryStream(cipherTextBytes))
      using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read)) {
        var plainTextBytes = new byte[cipherTextBytes.Length];
        int decryptedByteCount = cs.Read(plainTextBytes, 0, plainTextBytes.Length);
        return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
      }
    }

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