(Mono C#) AES Encryption ECB Mode with PKCS7 Padding

Duplicates the following C# code:

public static byte[] DecryptBySymmetricKey(string encryptedText, byte[] key)
  {
     string keyAsBase64 = Convert.ToBase64String(key);

     byte[] dataToDecrypt = Convert.FromBase64String(encryptedText);
     var keyBytes = key;
     AesManaged tdes = new AesManaged();
     tdes.KeySize = 256;
     tdes.BlockSize = 128;
     tdes.Key = keyBytes;
     tdes.Mode = CipherMode.ECB;
     tdes.Padding = PaddingMode.PKCS7;
     ICryptoTransform decrypt__1 = tdes.CreateDecryptor();
     byte[] deCipher = decrypt__1.TransformFinalBlock(dataToDecrypt, 0, dataToDecrypt.Length);
     tdes.Clear();
     string EK_result = Convert.ToBase64String(deCipher);
     return EK_result;
}

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

// In the C# code above that is to be duplicated here, use the base64 encoded key.
string keyAsBase64 = "...";
string encryptedBytesAsBase64 = "....";

crypt.KeyLength = 256;
crypt.CryptAlgorithm = "AES";
crypt.CipherMode = "ecb";
crypt.PaddingScheme = 0;
crypt.SetEncodedKey(keyAsBase64,"base64");

crypt.EncodingMode = "base64";

// Pass the base64 representation of the encrypted data.
// (The EncodingMode indicates you are passing base64.)
string EK_result = crypt.DecryptStringENC(encryptedBytesAsBase64);

Debug.WriteLine(EK_result);