using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Globalization;

namespace Utils.Security
{
	/// <summary>
	/// DES加密。方法一
	/// </summary>
	public class DES
	{
		/// <summary>
		/// 创建随机Key
		/// </summary>
		public string GenerateKey()//创建随机Key
		{
			DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
			return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
		}

		/// <summary>
		/// 加密字符串
		/// </summary>
		public string EncryptString(string sInputString, string sKey)//加密字符串
		{
			byte[] data = Encoding.UTF8.GetBytes(sInputString);
			DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
			DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
			DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
			ICryptoTransform desencrypt = DES.CreateEncryptor();
			byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
			return BitConverter.ToString(result);
		}

		/// <summary>
		/// 解密字符串
		/// </summary>
		public string DecryptString(string sInputString, string sKey)//解密字符串
		{
			string[] sInput = sInputString.Split("-".ToCharArray());
			byte[] data = new byte[sInput.Length];
			for (int i = 0; i < sInput.Length; i++) {
				data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
			}
			DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
			DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
			DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
			ICryptoTransform desencrypt = DES.CreateDecryptor();
			byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
			return Encoding.UTF8.GetString(result);
		}

	}
}