C#.NET 加密解密：AES/DES/Base64/RSA/MD5/SHA256

    1. using System;
    2. using System.Globalization;
    3. using System.IO;
    4. using System.Security.Cryptography;
    5. using System.Text;
    7. namespace Pub.Class
    8. {
    9.     public static class EncryptExtensions
    10.     {
    11.         private static readonly byte[] AESKeys = {0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F};
    12.         private static readonly byte[] DESKeys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
    14.         public static string AESEncode(this string encryptString, string encryptKey)
    15.         {
    16.             encryptKey = encryptKey.SubString(32, "");
    17.             encryptKey = encryptKey.PadRight(32, ' ');
    19.             var rijndaelProvider = new RijndaelManaged();
    20.             rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
    21.             rijndaelProvider.IV = AESKeys;
    22.             ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();
    24.             byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
    25.             byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);
    27.             return Convert.ToBase64String(encryptedData);
    28.         }
    30.         public static string AESDecode(this string decryptString, string decryptKey)
    31.         {
    32.             try
    33.             {
    34.                 decryptKey = decryptKey.SubString(32, "");
    35.                 decryptKey = decryptKey.PadRight(32, ' ');
    37.                 var rijndaelProvider = new RijndaelManaged();
    38.                 rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
    39.                 rijndaelProvider.IV = AESKeys;
    40.                 ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();
    42.                 byte[] inputData = Convert.FromBase64String(decryptString);
    43.                 byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);
    45.                 return Encoding.UTF8.GetString(decryptedData);
    46.             }
    47.             catch
    48.             {
    49.                 return string.Empty;
    50.             }
    51.         }
    53.         public static string DESEncode(this string encryptString, string encryptKey)
    54.         {
    55.             encryptKey = encryptKey.SubString(8, "");
    56.             encryptKey = encryptKey.PadRight(8, ' ');
    57.             byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
    58.             byte[] rgbIV = DESKeys;
    59.             byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
    60.             var dCSP = new DESCryptoServiceProvider();
    61.             var mStream = new MemoryStream();
    62.             var cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
    63.             cStream.Write(inputByteArray, 0, inputByteArray.Length);
    64.             cStream.FlushFinalBlock();
    65.             return Convert.ToBase64String(mStream.ToArray());
    66.         }
    68.         public static string DESDecode(this string decryptString, string decryptKey)
    69.         {
    70.             try
    71.             {
    72.                 decryptKey = decryptKey.SubString(8, "");
    73.                 decryptKey = decryptKey.PadRight(8, ' ');
    74.                 byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
    75.                 byte[] rgbIV = DESKeys;
    76.                 byte[] inputByteArray = Convert.FromBase64String(decryptString);
    77.                 var DCSP = new DESCryptoServiceProvider();
    79.                 var mStream = new MemoryStream();
    80.                 var cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
    81.                 cStream.Write(inputByteArray, 0, inputByteArray.Length);
    82.                 cStream.FlushFinalBlock();
    83.                 return Encoding.UTF8.GetString(mStream.ToArray());
    84.             }
    85.             catch
    86.             {
    87.                 return string.Empty;
    88.             }
    89.         }
    91.         public static string Base64Encode(this string encryptString)
    92.         {
    93.             byte[] encbuff = Encoding.UTF8.GetBytes(encryptString);
    94.             return Convert.ToBase64String(encbuff);
    95.         }
    97.         public static string Base64Decode(this string decryptString)
    98.         {
    99.             byte[] decbuff = Convert.FromBase64String(decryptString);
    100.             return Encoding.UTF8.GetString(decbuff);
    101.         }
    103.         public static string RSADecrypt(this string s, string key)
    104.         {
    105.             string result = null;
    107.             if (string.IsNullOrEmpty(s)) throw new ArgumentException("An empty string value cannot be encrypted.");
    109.             if (string.IsNullOrEmpty(key)) throw new ArgumentException("Cannot decrypt using an empty key. Please supply a decryption key.");
    111.             var cspp = new CspParameters();
    112.             cspp.KeyContainerName = key;
    114.             var rsa = new RSACryptoServiceProvider(cspp);
    115.             rsa.PersistKeyInCsp = true;
    117.             string[] decryptArray = s.Split(new[] {"-"}, StringSplitOptions.None);
    118.             byte[] decryptByteArray = Array.ConvertAll(decryptArray, (a => Convert.ToByte(byte.Parse(a, NumberStyles.HexNumber))));
    120.             byte[] bytes = rsa.Decrypt(decryptByteArray, true);
    122.             result = Encoding.UTF8.GetString(bytes);
    124.             return result;
    125.         }
    127.         public static string RSAEncrypt(this string s, string key)
    128.         {
    129.             if (string.IsNullOrEmpty(s)) throw new ArgumentException("An empty string value cannot be encrypted.");
    131.             if (string.IsNullOrEmpty(key)) throw new ArgumentException("Cannot encrypt using an empty key. Please supply an encryption key.");
    133.             var cspp = new CspParameters();
    134.             cspp.KeyContainerName = key;
    136.             var rsa = new RSACryptoServiceProvider(cspp);
    137.             rsa.PersistKeyInCsp = true;
    139.             byte[] bytes = rsa.Encrypt(Encoding.UTF8.GetBytes(s), true);
    141.             return BitConverter.ToString(bytes);
    142.         }
    144.         public static string MD5(this string str)
    145.         {
    146.             string cl1 = str;
    147.             string pwd = "";
    148.             MD5 md5 = System.Security.Cryptography.MD5.Create(); // 加密后是一个字节类型的数组 
    149.             byte[] s = md5.ComputeHash(Encoding.Unicode.GetBytes(cl1));
    150.             for (int i = 0; i < s.Length; i++)
    151.             {
    152. // 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得 
    153.                 pwd = pwd + s[i].ToString("x"); // 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符 
    154.             }
    155.             return pwd;
    156.         }
    158.         public static string MD5CSP(this string encypStr)
    159.         {
    160.             string retStr;
    161.             var m5 = new MD5CryptoServiceProvider();
    163.             //创建md5对象
    164.             byte[] inputBye;
    165.             byte[] outputBye;
    167.             //使用GB2312编码方式把字符串转化为字节数组．
    168.             inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);
    170.             outputBye = m5.ComputeHash(inputBye);
    172.             retStr = BitConverter.ToString(outputBye);
    173.             retStr = retStr.Replace("-", "").ToLower();
    174.             return retStr;
    175.         }
    177.         public static string SHA256(this string str)
    178.         {
    179.             byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
    180.             var Sha256 = new SHA256Managed();
    181.             byte[] Result = Sha256.ComputeHash(SHA256Data);
    182.             return Convert.ToBase64String(Result); //返回长度为44字节的字符串
    183.         }
    184.     }
    185. }