using System;
using System.Security.Cryptography;
using System.Text;

namespace WX.Interface.Security
{
    public class EncDecUtil : ITransfor
    {
        public string encyptData(string ciphertext, string accessKey)
        {

            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] iv = { 0x75, 0x70, 0x63, 0x68, 0x69, 0x6e, 0x61, 0x31 };
            ICryptoTransform encryptor = des.CreateEncryptor(key, iv);
            byte[] data = utf.GetBytes(ciphertext);
            byte[] encData = encryptor.TransformFinalBlock(data, 0, data.Length);
            return Convert.ToBase64String(encData);
        }

        public string decyptData(string cryptograph, string accessKey)
        {
            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] iv = { 0x75, 0x70, 0x63, 0x68, 0x69, 0x6e, 0x61, 0x31 };
            ICryptoTransform decryptor = des.CreateDecryptor(key, iv);
            byte[] encData = Convert.FromBase64String(cryptograph);
            byte[] data = decryptor.TransformFinalBlock(encData, 0, encData.Length);
            return utf.GetString(data);
        }

        public string signData(string ciphertext, string accessKey)
        {
            Encoding utf = new UTF8Encoding();
            HMACMD5 hmac = new HMACMD5(utf.GetBytes(accessKey));
            byte[] hashValue = hmac.ComputeHash(utf.GetBytes(ciphertext));
            return Convert.ToBase64String(hashValue);
        }

        public string encyptDataNew(string ciphertext, string accessKey, string iv)
        {
            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] ivbt = utf.GetBytes(iv);
            ICryptoTransform encryptor = des.CreateEncryptor(key, ivbt);
            byte[] data = utf.GetBytes(ciphertext);
            byte[] encData = encryptor.TransformFinalBlock(data, 0, data.Length);
            return Convert.ToBase64String(encData);
        }

        public string decyptDataNew(string cryptograph, string accessKey, string iv)
        {
            SymmetricAlgorithm des = new DESCryptoServiceProvider();

            Encoding utf = new UTF8Encoding();
            byte[] key = utf.GetBytes(accessKey);
            byte[] ivbt = utf.GetBytes(iv);
            ICryptoTransform decryptor = des.CreateDecryptor(key, ivbt);
            byte[] encData = Convert.FromBase64String(cryptograph);
            byte[] data = decryptor.TransformFinalBlock(encData, 0, encData.Length);
            return utf.GetString(data);
        }


    }
}