Gets the cipher text from Salesforce encryptWithManagedIV

RetrieveCipher.cs

        /// <summary>
        /// Retivers the cipher text without the IV
        /// </summary>
        /// <param name="base64_cipher_text"></param>
        /// <returns></returns>
        public static byte[] RetrieveCipher(string base64_cipher_text)
        {

            byte[] cipher_binary = Convert.FromBase64String(base64_cipher_text);
            var length = cipher_binary.Length - 16;
            byte[] cipher_only = new byte[length];
            Array.Copy(cipher_binary, 16, cipher_only, 0, length);
            return cipher_only;
        }