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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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