加密解密常用函数

本帖最后由小平于2013-6-22 10:05 编辑#region DES加密解密/// <summary>/// DES加密/// </summary>/// <param name="strSource">待加密字串</param>/// <param name="key">32位Key值</param>/// <returns>加密后的字符串</returns>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());}/// <summary>/// DES解密/// </summary>/// <param name="strSource">待解密的字串</param> /// <param name="key">32位Key值</param>/// <returns>解密后的字符串</returns>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/// <summary>/// 加密/// </summary>/// <param name="src"></param>/// <returns></returns>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);}/// <summary>/// 解密/// </summary>/// <param name="src"></param>/// <returns></returns>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 < InitialText.Length; ++i) if (InitialText > 0) Result.Append((char)InitialText);return Result.ToString();}/// <summary>/// 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/// </summary>/// <param name="s"></param>/// <returns></returns>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(puteHash(UTF8Encoding.Default.GetBytes(str)), 4, 8);t2 = t2.Replace("-", "");return t2;}//// <summary>/// MD5 32位加密/// </summary>/// <param name="str"></param>/// <returns></returns>public static string Md5To32(string str){string pwd = "";MD5 md5 = MD5.Create();byte[] s = puteHash(Encoding.UTF8.GetBytes(str));for (int i = 0; i < s.Length; i++){pwd = pwd + s.ToString("X");}return pwd;}#endregion#region 3DES加密解密public string Encrypt3DES(string str){//密钥string sKey = "wyw308";// //矢量,可为空string sIV = "scf521";// //构造对称算法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());}/// <summary>/// 带指定密钥和矢量的3DES加密/// </summary>/// <param name="str"></param>/// <param name="sKey"></param>/// <param name="sIV"></param>/// <returns></returns>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());}/// <summary>/// 带指定密钥和矢量的3DES解密/// </summary>/// <param name="Value"></param>/// <param name="sKey"></param>/// <param name="sIV"></param>/// <returns></returns>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 = (byte)((byte)str + 1);}str = "";for (int i = by.Length - 1;i >= 0;i--){str += ((char)by).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 = (byte)((byte)str - 1);}str = "";for (int i = by.Length - 1;i >= 0;i--){str += ((char)by).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 textfor (int i = 0; i < str.Length; i++){htext = htext + (char)(str + 10 - 1 * 2);return htext;}public static string DeCryptCnStr(string str) {string dtext = "";for (int i = 0; i < str.Length; i++){dtext = dtext + (char)(str - 10 + 1 * 2);}return dtext;}#endregion#region Url地址编码解码/// <summary>/// 编码Url地址/// </summary>/// <param name="url"></param>/// <returns></returns>public static string UrlEncode(string url){byte[] mByte = null;mByte = System.Text.Encoding.GetEncoding("GB2312").GetBytes(url);return System.Web.HttpUtility.UrlEncode(mByte);}/// <summary>/// 解码Url地址/// </summary>/// <param name="url"></param>/// <returns></returns>public static string UrlDecode(string url){return HttpUtility.UrlDecode(url, System.Text.Encoding.GetEncoding("GB2312"));}#endregion。