本文实例讲述了C#实现基于Base64的加密解密类。分享给大家供大家参考。具体如下：

这个C#类是一个基于Base64的加密和解密类，用户可以可以使用默认的秘钥进行加密、解密，也可以自己设定秘钥进行加密和解密，非常实用

using System;using System.Security.Cryptography; using System.Text;namespace DotNet.Utilities{ /// <summary> /// Encrypt 的摘要说明。 /// </summary> public class DEncrypt { /// <summary> /// 构造方法 /// </summary> public DEncrypt() { } #region 使用 缺省密钥字符串 加密/解密string /// <summary> /// 使用缺省密钥字符串加密string /// </summary> /// <param name="original">明文</param> /// <returns>密文</returns> public static string Encrypt(string original) { return Encrypt(original,"sharejs.com"); } /// <summary> /// 使用缺省密钥字符串解密string /// </summary> /// <param name="original">密文</param> /// <returns>明文</returns> public static string Decrypt(string original) { return Decrypt(original,"sharejs.com",System.Text.Encoding.Default); } #endregion #region 使用 给定密钥字符串 加密/解密string /// <summary> /// 使用给定密钥字符串加密string /// </summary> /// <param name="original">原始文字</param> /// <param name="key">密钥</param> /// <param name="encoding">字符编码方案</param> /// <returns>密文</returns> public static string Encrypt(string original, string key) { byte[] buff = System.Text.Encoding.Default.GetBytes(original); byte[] kb = System.Text.Encoding.Default.GetBytes(key); return Convert.ToBase64String(Encrypt(buff,kb)); } /// <summary> /// 使用给定密钥字符串解密string /// </summary> /// <param name="original">密文</param> /// <param name="key">密钥</param> /// <returns>明文</returns> public static string Decrypt(string original, string key) { return Decrypt(original,key,System.Text.Encoding.Default); } /// <summary> /// 使用给定密钥字符串解密string,返回指定编码方式明文 /// </summary> /// <param name="encrypted">密文</param> /// <param name="key">密钥</param> /// <param name="encoding">字符编码方案</param> /// <returns>明文</returns> public static string Decrypt(string encrypted, string key,Encoding encoding) { byte[] buff = Convert.FromBase64String(encrypted); byte[] kb = System.Text.Encoding.Default.GetBytes(key); return encoding.GetString(Decrypt(buff,kb)); } #endregion #region 使用 缺省密钥字符串 加密/解密/byte[] /// <summary> /// 使用缺省密钥字符串解密byte[] /// </summary> /// <param name="encrypted">密文</param> /// <param name="key">密钥</param> /// <returns>明文</returns> public static byte[] Decrypt(byte[] encrypted) { byte[] key = System.Text.Encoding.Default.GetBytes("sharejs.com"); return Decrypt(encrypted,key); } /// <summary> /// 使用缺省密钥字符串加密 /// </summary> /// <param name="original">原始数据</param> /// <param name="key">密钥</param> /// <returns>密文</returns> public static byte[] Encrypt(byte[] original) { byte[] key = System.Text.Encoding.Default.GetBytes("sharejs.com"); return Encrypt(original,key); } #endregion #region 使用 给定密钥 加密/解密/byte[] /// <summary> /// 生成MD5摘要 /// </summary> /// <param name="original">数据源</param> /// <returns>摘要</returns> public static byte[] MakeMD5(byte[] original) { MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider(); byte[] keyhash = hashmd5.ComputeHash(original); hashmd5 = null; return keyhash; } /// <summary> /// 使用给定密钥加密 /// </summary> /// <param name="original">明文</param> /// <param name="key">密钥</param> /// <returns>密文</returns> public static byte[] Encrypt(byte[] original, byte[] key) { TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider(); des.Key = MakeMD5(key); des.Mode = CipherMode.ECB; return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length); } /// <summary> /// 使用给定密钥解密数据 /// </summary> /// <param name="encrypted">密文</param> /// <param name="key">密钥</param> /// <returns>明文</returns> public static byte[] Decrypt(byte[] encrypted, byte[] key) { TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider(); des.Key = MakeMD5(key); des.Mode = CipherMode.ECB; return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length); } #endregion }}

希望本文所述对大家的C#程序设计有所帮助。