ASP.NET加密解密算法分享

 #region DES加密解密 /// 
 /// DES加密 /// 
 /// 待加密字串 /// 32位Key值 /// 加密后的字符串 public string DESEncrypt(string strSource) { return DESEncrypt(strSource, DESKey); } public string DESEncrypt(string strSource, byte[] key) { SymmetricAlgorithm sa = Rijndael.Create(); sa.Key = key; sa.Mode = CipherMode.ECB; sa.Padding = PaddingMode.Zeros; MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write); byte[] byt = Encoding.Unicode.GetBytes(strSource); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } /// 
 /// DES解密 /// 
 /// 待解密的字串 /// 32位Key值 /// 解密后的字符串 public string DESDecrypt(string strSource) { return DESDecrypt(strSource, DESKey); } public string DESDecrypt(string strSource, byte[] key) { SymmetricAlgorithm sa = Rijndael.Create(); sa.Key = key; sa.Mode = CipherMode.ECB; sa.Padding = PaddingMode.Zeros; ICryptoTransform ct = sa.CreateDecryptor(); byte[] byt = Convert.FromBase64String(strSource); MemoryStream ms = new MemoryStream(byt); CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read); StreamReader sr = new StreamReader(cs, Encoding.Unicode); return sr.ReadToEnd(); } #endregion #region 一个用hash实现的加密解密方法 /// 
 /// 加密 /// 
 ///  ///  public static string EncryptStrByHash(string src) { if (src.Length == 0) { return ""; } byte[] HaKey = System.Text.Encoding.ASCII.GetBytes((src + "Test").ToCharArray()); byte[] HaData = new byte[20]; HMACSHA1 Hmac = new HMACSHA1(HaKey); CryptoStream cs = new CryptoStream(Stream.Null, Hmac, CryptoStreamMode.Write); try { cs.Write(HaData, 0, HaData.Length); } finally { cs.Close(); } string HaResult = System.Convert.ToBase64String(Hmac.Hash).Substring(0, 16); byte[] RiKey = System.Text.Encoding.ASCII.GetBytes(HaResult.ToCharArray()); byte[] RiDataBuf = System.Text.Encoding.ASCII.GetBytes(src.ToCharArray()); byte[] EncodedBytes =  { }; MemoryStream ms = new MemoryStream(); RijndaelManaged rv = new RijndaelManaged(); cs = new CryptoStream(ms, rv.CreateEncryptor(RiKey, RiKey), CryptoStreamMode.Write); try { cs.Write(RiDataBuf, 0, RiDataBuf.Length); cs.FlushFinalBlock(); EncodedBytes = ms.ToArray(); } finally { ms.Close(); cs.Close(); } return HaResult + System.Convert.ToBase64String(EncodedBytes); } /// 
 /// 解密 /// 
 ///  ///  public static string DecrypStrByHash(string src) { if (src.Length <40) return ""; byte[] SrcBytes = System.Convert.FromBase64String(src.Substring(16)); byte[] RiKey = System.Text.Encoding.ASCII.GetBytes(src.Substring(0, 16).ToCharArray()); byte[] InitialText = new byte[SrcBytes.Length]; RijndaelManaged rv = new RijndaelManaged(); MemoryStream ms = new MemoryStream(SrcBytes); CryptoStream cs = new CryptoStream(ms, rv.CreateDecryptor(RiKey, RiKey), CryptoStreamMode.Read); try { cs.Read(InitialText, 0, InitialText.Length); } finally { ms.Close(); cs.Close(); } System.Text.StringBuilder Result = new System.Text.StringBuilder(); for (int i = 0; i  0) Result.Append((char)InitialText[i]); return Result.ToString(); } /// 
 /// 对加密后的密文重新编码,如果密文长>16,则去掉前16个字符,如果长度小于16,返回空字符串 /// 
 ///  ///  public string ReEncryptStrByHash(string s) { string e = Encrypt.EncryptStrByHash(s); return ((e.Length > 16) ? e.Substring(16) : ""); } #endregion #region Md5加密,生成16位或32位,生成的密文都是大写 public static string Md5To16(string str) { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(str)), 4, 8); t2 = t2.Replace("-", ""); return t2; } //// 
 /// MD5　32位加密 /// 
 ///  ///  public static string Md5To32(string str) { string pwd = ""; MD5 md5 = MD5.Create(); byte[] s = md5.ComputeHash(Encoding.UTF8.GetBytes(str)); for (int i = 0; i  /// 带指定密钥和矢量的3DES加密 ///  ///  ///  ///  ///  public string Encrypt3DES(string str, string sKey, string sIV) { SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV); byt = Encoding.UTF8.GetBytes(str); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } //解密 public string Decrypt3DES(string Value) { string sKey = "wyw308"; string sIV = "scf521"; SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV); byt = Convert.FromBase64String(Value); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } /// 
 /// 带指定密钥和矢量的3DES解密 /// 
 ///  ///  ///  ///  public string Decrypt3DES(string str, string sKey, string sIV) { SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider(); ICryptoTransform ct; MemoryStream ms; CryptoStream cs; byte[] byt; mCSP.Key = Convert.FromBase64String(sKey); mCSP.IV = Convert.FromBase64String(sIV); mCSP.Mode = System.Security.Cryptography.CipherMode.ECB; mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7; ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV); byt = Convert.FromBase64String(str); ms = new MemoryStream(); cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Encoding.UTF8.GetString(ms.ToArray()); } #endregion #region 一个简单的加密解密方法,只支持英文 public static string EnCryptEnStr(string str) //倒序加1加密 { byte[] by = new byte[str.Length]; for (int i = 0; i <= str.Length - 1; i++) { by[i] = (byte)((byte)str[i] + 1); } str = ""; for (int i = by.Length - 1; i >= 0; i--) { str += ((char)by[i]).ToString(); } return str; } public static string DeCryptEnStr(string str) //顺序减1解码 { byte[] by = new byte[str.Length]; for (int i = 0; i <= str.Length - 1; i++) { by[i] = (byte)((byte)str[i] - 1); } str = ""; for (int i = by.Length - 1; i >= 0; i--) { str += ((char)by[i]).ToString(); } return str; } #endregion #region 一个简单的加密解密方法,在上一个的基础上支持中文 public static string EnCryptCnStr(string str) { string htext = ""; // blank text for (int i = 0; i  /// 编码Url地址 ///  ///  ///  public static string UrlEncode(string url) { byte[] mByte = null; mByte = System.Text.Encoding.GetEncoding("GB2312").GetBytes(url); return System.Web.HttpUtility.UrlEncode(mByte); } /// 
 /// 解码Url地址 /// 
 ///  ///  public static string UrlDecode(string url) { return HttpUtility.UrlDecode(url, System.Text.Encoding.GetEncoding("GB2312")); } #endregion