(Ruby) 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;
}

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

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

crypt = Chilkat::CkCrypt2.new()

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

crypt.put_KeyLength(256)
crypt.put_CryptAlgorithm("AES")
crypt.put_CipherMode("ecb")
crypt.put_PaddingScheme(0)
crypt.SetEncodedKey(keyAsBase64,"base64")

crypt.put_EncodingMode("base64")

# Pass the base64 representation of the encrypted data.
# (The EncodingMode indicates you are passing base64.)
EK_result = crypt.decryptStringENC(encryptedBytesAsBase64)

print EK_result + "\n";