146 lines
4.2 KiB
C#
146 lines
4.2 KiB
C#
using System;
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using System.Security.Cryptography;
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using System.Text;
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public class EncrypHelper
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{
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/// <summary>
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///静态无参构造
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/// </summary>
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static EncrypHelper()
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{
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//默认的密钥
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SecretKey = "";
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}
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/// <summary>
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/// 使用SHA256加密字符串
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/// </summary>
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/// <param name="Source"></param>
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/// <returns></returns>
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public static string EncrypToSHA(string Source)
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{
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SHA256Managed sha256 = new SHA256Managed();
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byte[] s = UTF8Encoding.UTF8.GetBytes(Source);
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byte[] t = sha256.ComputeHash(s);
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return Convert.ToBase64String(t);
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}
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/// <summary>
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/// 缺省的密钥
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/// </summary>
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public static readonly string SecretKey;
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/// <summary>
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/// 使用缺省密钥字符串加密string
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/// </summary>
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/// <param name="original">明文</param>
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/// <returns>密文</returns>
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public static string Encrypt(string original)
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{
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return Encrypt(original, SecretKey);
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}
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/// <summary>
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/// 使用缺省密钥字符串解密string
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/// </summary>
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/// <param name="original">密文</param>
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/// <returns>明文</returns>
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public static string Decrypt(string original)
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{
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try
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{
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return Decrypt(original, SecretKey, System.Text.Encoding.Default);
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}
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catch (Exception)
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{
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}
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return string.Empty;
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}
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/// <summary>
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/// 使用给定密钥字符串加密string
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/// </summary>
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/// <param name="original">原始文字</param>
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/// <param name="key">密钥</param>
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/// <returns>密文</returns>
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public static string Encrypt(string original, string key)
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{
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byte[] buff = System.Text.Encoding.Default.GetBytes(original);
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byte[] kb = System.Text.Encoding.Default.GetBytes(key);
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return Convert.ToBase64String(Encrypt(buff, kb));
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}
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/// <summary>
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/// 使用给定密钥字符串解密string
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/// </summary>
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/// <param name="original">密文</param>
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/// <param name="key">密钥</param>
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/// <returns>明文</returns>
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public static string Decrypt(string original, string key)
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{
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return Decrypt(original, key, System.Text.Encoding.Default);
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}
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/// <summary>
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/// 使用给定密钥字符串解密string,返回指定编码方式明文
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/// </summary>
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/// <param name="encrypted">密文</param>
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/// <param name="key">密钥</param>
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/// <param name="encoding">字符编码方案</param>
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/// <returns>明文</returns>
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public static string Decrypt(string encrypted, string key, Encoding encoding)
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{
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byte[] buff = Convert.FromBase64String(encrypted);
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byte[] kb = System.Text.Encoding.Default.GetBytes(key);
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return encoding.GetString(Decrypt(buff, kb));
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}
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/// <summary>
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/// 生成MD5摘要
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/// </summary>
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/// <param name="original">数据源</param>
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/// <returns>摘要</returns>
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public static byte[] MakeMd5(byte[] original)
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{
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MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
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byte[] keyhash = hashmd5.ComputeHash(original);
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hashmd5 = null;
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return keyhash;
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}
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/// <summary>
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/// 使用给定密钥加密
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/// </summary>
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/// <param name="original">明文</param>
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/// <param name="key">密钥</param>
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/// <returns>密文</returns>
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public static byte[] Encrypt(byte[] original, byte[] key)
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{
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TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
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des.Key = MakeMd5(key);
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des.Mode = CipherMode.ECB;
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return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length);
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}
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/// <summary>
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/// 使用给定密钥解密数据
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/// </summary>
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/// <param name="encrypted">密文</param>
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/// <param name="key">密钥</param>
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/// <returns>明文</returns>
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public static byte[] Decrypt(byte[] encrypted, byte[] key)
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{
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TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
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des.Key = MakeMd5(key);
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des.Mode = CipherMode.ECB;
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return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length);
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}
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}
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