对称加密算法实现ASP.NET数据加密是如何的呢?那么下面就想大家详细说明:
以下是关于对称加密算法的C#实现ASP.NET数据加密代码,大家可以根据需要更改不同的算法,文中以Rijndael算法为例:
- using System;
- using System.IO;
- using System.Security.Cryptography;
- using System.Text;
- namespace DataCrypto
- {
- /// ﹤summary﹥
- /// ASP.NET数据加密之对称加密算法类
- /// ﹤/summary﹥
- public class SymmetricMethod
- {
- private SymmetricAlgorithm mobjCryptoService;
- private string Key;
- /// ﹤summary﹥
- /// ASP.NET数据加密之对称加密类的构造函数
- /// ﹤/summary﹥
- public SymmetricMethod()
- {
- mobjCryptoService = new RijndaelManaged();
- Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
- }
- /// ﹤summary﹥
- ///ASP.NET数据加密之获得密钥
- /// ﹤/summary﹥
- /// ﹤returns﹥密钥﹤/returns﹥
- private byte[] GetLegalKey()
- {
- string sTemp = Key;
- mobjCryptoService.GenerateKey();
- byte[] bytTemp = mobjCryptoService.Key;
- int KeyLength = bytTemp.Length;
- if (sTemp.Length ﹥ KeyLength)
- sTemp = sTemp.Substring(0, KeyLength);
- else if (sTemp.Length ﹤ KeyLength)
- sTemp = sTemp.PadRight(KeyLength, ' ');
- return ASCIIEncoding.ASCII.GetBytes(sTemp);
- }
- /// ﹤summary﹥
- /// ASP.NET数据加密之获得初始向量IV
- /// ﹤/summary﹥
- /// ﹤returns﹥初试向量IV﹤/returns﹥
- private byte[] GetLegalIV()
- {
- string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
- mobjCryptoService.GenerateIV();
- byte[] bytTemp = mobjCryptoService.IV;
- int IVLength = bytTemp.Length;
- if (sTemp.Length ﹥ IVLength)
- sTemp = sTemp.Substring(0, IVLength);
- else if (sTemp.Length ﹤ IVLength)
- sTemp = sTemp.PadRight(IVLength, ' ');
- return ASCIIEncoding.ASCII.GetBytes(sTemp);
- }
- /// ﹤summary﹥
- /// ASP.NET数据加密之加密方法
- /// ﹤/summary﹥
- /// ﹤param name="Source"﹥待加密的串﹤/param﹥
- /// ﹤returns﹥经过加密的串﹤/returns﹥
- public string Encrypto(string Source)
- {
- byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
- MemoryStream ms = new MemoryStream();
- mobjCryptoService.Key = GetLegalKey();
- mobjCryptoService.IV = GetLegalIV();
- ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
- CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
- cs.Write(bytIn, 0, bytIn.Length);
- cs.FlushFinalBlock();
- ms.Close();
- byte[] bytOut = ms.ToArray();
- return Convert.ToBase64String(bytOut);
- }
- /// ﹤summary﹥
- /// ASP.NET数据加密之解密方法
- /// ﹤/summary﹥
- /// ﹤param name="Source"﹥待解密的串﹤/param﹥
- /// ﹤returns﹥经过解密的串﹤/returns﹥
- public string Decrypto(string Source)
- {
- byte[] bytIn = Convert.FromBase64String(Source);
- MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
- mobjCryptoService.Key = GetLegalKey();
- mobjCryptoService.IV = GetLegalIV();
- ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
- CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
- StreamReader sr = new StreamReader(cs);
- return sr.ReadToEnd();
- }
- }
- }
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