using NFC.Crypto;
using System;

namespace NFC.NXP_MIFARE_DESFire
{
    public class CMAC
    {
        #region Contructors
        public CMAC(CipherType cipher)
        {
            switch(cipher)
            {
                case(CipherType.TDES):
                    _Cipher = new TDES();
                    break;
                case(CipherType.TDES_2K):
                    _Cipher = new TDES_2K();
                    break;
                case(CipherType.TDES_3K):
                    _Cipher = new TDES_3K();
                    break;
                case (CipherType.AES):
                    _Cipher = new AES();
                    break;
                default:
                    throw new ArgumentException("Unkown Cipher Type.");
            }
        }

        public CMAC(ICipher cipher)
        {
            _Cipher = cipher ?? throw new ArgumentNullException();
        }
        #endregion

        #region Properties
        private ICipher _Cipher;
        #endregion

        #region Methods
        /// <summary>
        /// Generate Key with all Zeros, in KeySize
        /// </summary>
        public byte[] GenerateEmpytKey()
        {
            byte[] key = new byte[_Cipher.KeySize];
            for (int i = 0; i < _Cipher.KeySize; i++)
            {
                key[i] = 0;
            }

            return key;
        }

        /// <summary>
        /// Generate IV with all Zeros, in KeySize
        /// </summary>
        public byte[] GenerateEmpytIV()
        {
            byte[] key = new byte[_Cipher.BlockSize];
            for (int i = 0; i < _Cipher.BlockSize; i++)
            {
                key[i] = 0;
            }

            return key;
        }

        /// <summary>
        /// Encrypt Data
        /// </summary>
        public byte[] Encrypt(byte[] data)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Decrypt Data
        /// </summary>
        public byte[] Decrypt(byte[] data)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <returns>Two Keys</returns>
        public byte[][] GenerateSubKey()
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public byte[] Digest(byte[] data)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}