how to encrypt string using AES 128 bit in c#?

Question

im working on webapplication in asp.net with oracle Database12c im using aes128 stored procedure to encrypt the password here is the procedure that makes encryption

DECLARE
   l_user_id    test.username%TYPE := 'SCOTT';
   l_user_psw   VARCHAR2 (2000) := 'mypassword123';

   l_key        VARCHAR2 (2000) := '1234567890999999';
   l_mod NUMBER
         :=   DBMS_CRYPTO.ENCRYPT_AES128
            + DBMS_CRYPTO.CHAIN_CBC
            + DBMS_CRYPTO.PAD_PKCS5;
   l_enc        RAW (2000);
BEGIN
   l_user_psw :=
      DBMS_CRYPTO.encrypt (UTL_I18N.string_to_raw (l_user_psw, 'AR8MSWIN1256'),
                           l_mod,
                           UTL_I18N.string_to_raw (l_key, 'AR8MSWIN1256'));
   
      DBMS_OUTPUT.put_line ('Encrypted=' || l_user_psw);

   INSERT INTO test VALUES (l_user_id, l_user_psw);
dbms_output.put_line('done');
   COMMIT;
END;
/

and the final result is

132BEDB1C2CDD8F23B5A619412C27B60

now i want to make identical Aes in c# i know i can call stored procedure from c# and get the same result but i want to make it using c# for security reasons i have tried many ways but ended up with different result ! i need help please !

Answer 1

Since I'm feeling generous, I'll provide a solution for you:

public static string EncryptPassword(string key, string password)
{
    // Your current code uses WIN1256 encoding for converting
    // your strings to bytes, so we'll use that here
    var encoding = System.Text.Encoding.GetEncoding(1256);
    byte[] passwordBytes = encoding.GetBytes(password);
    byte[] keyBytes = encoding.GetBytes(key);

    using (var aes = AesManaged.Create())
    {
        // Set up the algorithm
        aes.Padding = PaddingMode.PKCS7;
        aes.Mode = CipherMode.CBC;
        aes.Key = keyBytes;
        aes.BlockSize = 128; // AES-128
        // You don't specify an IV in your procedure, so we
        // need to zero it
        aes.IV = new byte[16];

        // Create a memorystream to store the result
        using (var ms = new MemoryStream())
        {
            // create an encryptor transform, and wrap the memorystream in a cryptostream
            using (var transform = aes.CreateEncryptor())
            using (var cs = new CryptoStream(ms, transform, CryptoStreamMode.Write))
            {
                // write the password bytes
                cs.Write(passwordBytes, 0, passwordBytes.Length);
            }
            
            // get the encrypted bytes and format it as a hex string and then return it
            return BitConverter.ToString(ms.ToArray()).Replace("-", string.Empty);
        }
    }
}

Try it online