109 lines
3.7 KiB
C#
109 lines
3.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace DH.RBAC.Utility.Other
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{
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public static class DESHelper
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{
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#region DES加密解密
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/// <summary>
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/// 默认密钥。
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/// </summary>
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private const string DESENCRYPT_KEY = "hsdjxlzf";
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/// <summary>
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/// DES加密，使用自定义密钥。
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/// </summary>
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/// <param name="text">待加密的明文</param>
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/// <param name="key">8位字符的密钥字符串</param>
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/// <returns></returns>
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public static string DESEncrypt(this string text, string key)
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{
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if (key.Length != 8)
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{
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key = DESENCRYPT_KEY;
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}
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DESCryptoServiceProvider des = new DESCryptoServiceProvider();
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byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(text);
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byte[] a = ASCIIEncoding.ASCII.GetBytes(key);
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des.Key = ASCIIEncoding.ASCII.GetBytes(key);
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des.IV = ASCIIEncoding.ASCII.GetBytes(key);
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MemoryStream ms = new MemoryStream();
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CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
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cs.Write(inputByteArray, 0, inputByteArray.Length);
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cs.FlushFinalBlock();
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StringBuilder ret = new StringBuilder();
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foreach (byte b in ms.ToArray())
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{
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ret.AppendFormat("{0:X2}", b);//将第一个参数转换为十六进制数,长度为2,不足前面补0
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}
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return ret.ToString();
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}
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/// <summary>
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/// DES解密，使用自定义密钥。
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/// </summary>
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/// <param name="cyphertext">待解密的秘文</param>
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/// <param name="key">必须是8位字符的密钥字符串(不能有特殊字符)</param>
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/// <returns></returns>
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public static string DESDecrypt(this string cyphertext, string key)
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{
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if (key.Length != 8)
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{
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key = DESENCRYPT_KEY;
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}
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if (string.IsNullOrEmpty(cyphertext))
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return string.Empty;
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DESCryptoServiceProvider des = new DESCryptoServiceProvider();
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byte[] inputByteArray = new byte[cyphertext.Length / 2];
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for (int x = 0; x < cyphertext.Length / 2; x++)
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{
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int i = (Convert.ToInt32(cyphertext.Substring(x * 2, 2), 16));
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inputByteArray[x] = (byte)i;
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}
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des.Key = ASCIIEncoding.ASCII.GetBytes(key);
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des.IV = ASCIIEncoding.ASCII.GetBytes(key);
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MemoryStream ms = new MemoryStream();
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CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
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cs.Write(inputByteArray, 0, inputByteArray.Length);
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cs.FlushFinalBlock();
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StringBuilder ret = new StringBuilder();
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return System.Text.Encoding.GetEncoding("UTF-8").GetString(ms.ToArray());
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}
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/// <summary>
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/// DES加密，使用默认密钥。
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/// </summary>
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/// <param name="text">待加密的明文</param>
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/// <returns></returns>
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public static string DESEncrypt(this string text)
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{
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return DESEncrypt(text, DESENCRYPT_KEY);
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}
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/// <summary>
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/// DES解密，使用默认密钥。
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/// </summary>
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/// <param name="cyphertext">待解密的秘文</param>
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/// <returns></returns>
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public static string DESDecrypt(this string cyphertext)
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{
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return DESDecrypt(cyphertext, DESENCRYPT_KEY);
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}
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#endregion
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}
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}
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