114 lines
4.1 KiB
C#
114 lines
4.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Security.Cryptography;
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using System.IO;
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namespace ryCommon
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{
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class clsAES
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{
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//默认密钥向量
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private static byte[] _key1 = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF, 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
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/// <summary>
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/// AES加密算法
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/// </summary>
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/// <param name="plainText">明文字符串</param>
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/// <param name="strKey">密钥</param>
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/// <returns>返回加密后的密文字节数组</returns>
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public static byte[] AESEncrypt(string plainText, string strKey)
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{
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//分组加密算法
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SymmetricAlgorithm des = Rijndael.Create();
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byte[] inputByteArray = Encoding.UTF8.GetBytes(plainText);//得到需要加密的字节数组
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//设置密钥及密钥向量
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des.Key = Encoding.UTF8.GetBytes(strKey);
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des.IV = _key1;
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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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byte[] cipherBytes = ms.ToArray();//得到加密后的字节数组
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cs.Close();
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ms.Close();
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return cipherBytes;
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}
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/// <summary>
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/// AES解密
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/// </summary>
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/// <param name="cipherText">密文字节数组</param>
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/// <param name="strKey">密钥</param>
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/// <returns>返回解密后的字符串</returns>
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public static byte[] AESDecrypt(byte[] cipherText, string strKey)
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{
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SymmetricAlgorithm des = Rijndael.Create();
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des.Key = Encoding.UTF8.GetBytes(strKey);
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des.IV = _key1;
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byte[] decryptBytes = new byte[cipherText.Length];
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MemoryStream ms = new MemoryStream(cipherText);
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CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Read);
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cs.Read(decryptBytes, 0, decryptBytes.Length);
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cs.Close();
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ms.Close();
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return decryptBytes;
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}
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/// <summary>
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/// 加密
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/// </summary>
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/// <param name="Message"></param>
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/// <returns></returns>
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public static string Encode(string data,string pass)
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{
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byte[] encryptBytes = AESEncrypt(data, ConvertKey(pass));
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return Convert.ToBase64String(encryptBytes);
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//将加密后的密文转换为Base64编码，以便显示，可以查看下结果
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}
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/// <summary>
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/// 解码
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/// </summary>
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/// <param name="Message"></param>
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/// <returns></returns>
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public static string Decode(string data, string pass)
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{
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try
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{
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//解密
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byte[] decryptBytes = AESDecrypt(Convert.FromBase64String(data), ConvertKey(pass));
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//将解密后的结果转换为字符串,也可以将该步骤封装在解密算法中
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string result = Encoding.UTF8.GetString(decryptBytes);
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return result.Replace("\0", "");
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}
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catch
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{
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return "";
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}
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}
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public static string GetMD5(string str)
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{
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StringBuilder sb = new StringBuilder();
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foreach (byte b in System.Security.Cryptography.MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(str)))
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{
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sb.Append(b.ToString("X2"));
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}
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return sb.ToString();
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}
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/// <summary>
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/// 转换密钥到合法密钥
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/// </summary>
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/// <param name="pass"></param>
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/// <returns></returns>
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public static string ConvertKey(string pass)
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{
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string sxStr = GetMD5(pass);
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if (sxStr.Length > 32)
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{
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return sxStr.Substring(0, 32);
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}
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else
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{
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return (sxStr + sxStr).Substring(0, 32);
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}
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}
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}
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}
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