字符串加密、解密算法

字符串加密、解密算法包括：
MD5、Des、Base64三种方式，详情如下所示：using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;namespace EncryptTools
{/// <summary>/// 加解密帮助类/// </summary>public class EncryptHelpers{//定义一个用于保存静态变量的实例private static EncryptHelpers instance = null;//定义一个保证线程同步的标识private static readonly object locker = new object();//构造函数为私有，使外界不能创建该类的实例private EncryptHelpers() { }public static EncryptHelpers Instance{get{if (instance == null){lock (locker){if (instance == null) instance = new EncryptHelpers();}}return instance;}}private byte[] Keys = new byte[]{18, 52, 86, 120, 144, 171, 222, 239};private string EncryptKey = "SWGSUNWG";#region MD5加密/// <summary>/// MD5加密/// </summary>/// <param name="content">需要加密的字符串</param>/// <param name="encode">字符的编码，默认null=UTF8Encoding</param>/// <returns></returns>public string MD5Encrypt(string content, Encoding encode = null){if (string.IsNullOrEmpty(content)) return string.Empty;if (encode == null) encode = new UTF8Encoding();MD5 md5 = new MD5CryptoServiceProvider();byte[] t = md5.ComputeHash(encode.GetBytes(content));StringBuilder sb = new StringBuilder(32);for (int i = 0; i < t.Length; i++)sb.Append(t[i].ToString("x").PadLeft(2, '0'));return sb.ToString();}/// <summary>/// MD5加密(返回16位加密串)/// </summary>/// <param name="content">需要加密的字符串</param>/// <param name="encode">字符的编码，默认null=UTF8Encoding</param>/// <returns></returns>public string MD5Encrypt16(string content, Encoding encode = null){if (string.IsNullOrEmpty(content)) return string.Empty;if (encode == null) encode = new UTF8Encoding();MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();string result = BitConverter.ToString(md5.ComputeHash(encode.GetBytes(content)), 4, 8);result = result.Replace("-", "");return result;}#endregion#region Des 加密、解密/// <summary> /// 加密数据 /// 如秘钥为空 则返回原文/// </summary> /// <param name="content">加密前文本</param> /// <param name="desKey">密匙</param> /// <returns></returns> public string DesEncrypt(string content, string desKey){try{if (string.IsNullOrEmpty(desKey)) return content;DESCryptoServiceProvider des = new DESCryptoServiceProvider();des.Mode = CipherMode.ECB;var keys = new byte[8];if (desKey.Length < 8){var tmpkeys = System.Text.Encoding.UTF8.GetBytes(desKey);for (int i = 0; i < keys.Length; i++){if (tmpkeys.Length > i)keys[i] = tmpkeys[i];elsekeys[i] = 0;}}else keys = System.Text.Encoding.UTF8.GetBytes(desKey.Substring(0, 8));des.Key = keys;des.IV = des.Key;byte[] inputByteArray = System.Text.Encoding.UTF8.GetBytes(content);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();StringBuilder sb = new StringBuilder();foreach (var item in ms.ToArray()){sb.Append(item.ToString());sb.Append("_");}if (sb.Length > 0) sb = sb.Remove(sb.Length - 1, 1);return sb.ToString();}catch (System.Exception e){return content;}}/// <summary> /// 解密数据 /// 如秘钥为空 则返回原文/// </summary> /// <param name="content">密文</param> /// <param name="desKey">密匙</param> /// <returns>解密失败返回空字符串</returns> public string DesDecrypt(string content, string desKey){try{if (string.IsNullOrEmpty(desKey)) return content;DESCryptoServiceProvider des = new DESCryptoServiceProvider();des.Mode = CipherMode.ECB;var keys = new byte[8];if (desKey.Length < 8){var tmpkeys = System.Text.Encoding.UTF8.GetBytes(desKey);for (int i = 0; i < keys.Length; i++){if (tmpkeys.Length > i)keys[i] = tmpkeys[i];elsekeys[i] = 0;}}else keys = System.Text.Encoding.UTF8.GetBytes(desKey.Substring(0, 8));des.Key = keys;des.IV = des.Key;var data = content.Split('_');byte[] inputByteArray = new byte[data.Length]; ;for (int i = 0; i < data.Length; i++){inputByteArray[i] = Convert.ToByte(data[i]);}MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();System.Text.Encoding encoding = new System.Text.UTF8Encoding();return encoding.GetString(ms.ToArray());}catch (System.Exception e){return "";}}/// <summary> /// 加密数据 /// </summary> /// <param name="encryptString">加密前文本</param> /// <returns></returns> public string DesEncrypt(string encryptString){string result;try{byte[] bytes = Encoding.UTF8.GetBytes(EncryptKey.Substring(0, 8));byte[] keys = Keys;byte[] bytes2 = Encoding.UTF8.GetBytes(encryptString);DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();MemoryStream memoryStream = new MemoryStream();CryptoStream cryptoStream = new CryptoStream(memoryStream,dESCryptoServiceProvider.CreateEncryptor(bytes, keys), CryptoStreamMode.Write);cryptoStream.Write(bytes2, 0, bytes2.Length);cryptoStream.FlushFinalBlock();result = Convert.ToBase64String(memoryStream.ToArray());}catch{result = encryptString;}return result;}/// <summary> /// 解密数据 /// </summary> /// <param name="decryptString">密文</param> /// <returns>解密失败返回空字符串</returns> public string DesDecrypt(string decryptString){string result;try{byte[] bytes = Encoding.UTF8.GetBytes(EncryptKey);byte[] keys = Keys;byte[] array = Convert.FromBase64String(decryptString);DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();MemoryStream memoryStream = new MemoryStream();CryptoStream cryptoStream = new CryptoStream(memoryStream,dESCryptoServiceProvider.CreateDecryptor(bytes, keys), CryptoStreamMode.Write);cryptoStream.Write(array, 0, array.Length);cryptoStream.FlushFinalBlock();result = Encoding.UTF8.GetString(memoryStream.ToArray());}catch{result = decryptString;}return result;}#endregion#region Base64加密解密/// <summary>/// Base64加密/// </summary>/// <param name="content">需要加密的字符串</param>/// <param name="encode">字符的编码，默认null=UTF8Encoding</param>/// <returns></returns>public string Base64Encrypt(string content, Encoding encode = null){if (encode == null) encode = new UTF8Encoding();return Convert.ToBase64String(encode.GetBytes(content));}/// <summary>/// Base64解密/// </summary>/// <param name="content">需要解密的字符串</param>/// <param name="encode">字符的编码，默认null=UTF8Encoding</param>/// <returns></returns>public string Base64Decrypt(string content, Encoding encode = null){if (encode == null) encode = new UTF8Encoding();return encode.GetString(Convert.FromBase64String(content));}#endregion}
}测试代码：private void MD5Encrypt_Click(object sender, EventArgs e){this.txtMd5Value.Text=EncryptHelpers.Instance.MD5Encrypt(this.txtMd5Key.Text.Trim());}private void MD5Encrypt16_Click(object sender, EventArgs e){this.txtMd5Value.Text = EncryptHelpers.Instance.MD5Encrypt16(this.txtMd5Key.Text.Trim());}private void DesEncrypt_Click(object sender, EventArgs e){this.txtDesValue.Text = EncryptHelpers.Instance.DesEncrypt(this.txtDesKey.Text.Trim(),"医技预约平台");}private void DesDecrypt_Click(object sender, EventArgs e){this.txtDesValue.Text = EncryptHelpers.Instance.DesDecrypt(this.txtDesValue.Text.Trim(), "医技预约平台");}private void Base64Encrypt_Click(object sender, EventArgs e){this.txtBaseValue.Text = EncryptHelpers.Instance.Base64Encrypt(this.txtBaseKey.Text.Trim());}private void Base64Decrypt_Click(object sender, EventArgs e){this.txtBaseValue.Text = EncryptHelpers.Instance.Base64Decrypt(this.txtBaseValue.Text.Trim());}private void DesEncrypt2_Click(object sender, EventArgs e){this.txtDesValue2.Text = EncryptHelpers.Instance.DesEncrypt(this.txtDesKey2.Text.Trim());}private void DesDecrypt2_Click(object sender, EventArgs e){this.txtDesValue2.Text = EncryptHelpers.Instance.DesDecrypt(this.txtDesValue2.Text.Trim());}

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