包括：AES/DES/Base64/RSA/MD5/SHA256
http://www.sosuo8.com/article/show.asp?id=3083
http://blog.****.net/llwinnner/article/details/4011936
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Data;
using System.Data.Common;
using System.Web.Script.Serialization;
using System.IO;
using System.Security.Cryptography;
namespace Pub.Class
{
public static class EncryptExtensions
{
private static byte[] AESKeys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };
public static string AESEncode(this string encryptString, string encryptKey)
{
encryptKey = encryptKey.SubString(, "");
encryptKey = encryptKey.PadRight(, ' ');
RijndaelManaged rijndaelProvider = new RijndaelManaged();
rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(, ));
rijndaelProvider.IV = AESKeys;
ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();
byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, , inputData.Length);
return Convert.ToBase64String(encryptedData);
}
public static string AESDecode(this string decryptString, string decryptKey)
{
try
{
decryptKey = decryptKey.SubString(, "");
decryptKey = decryptKey.PadRight(, ' ');
RijndaelManaged rijndaelProvider = new RijndaelManaged();
rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);
rijndaelProvider.IV = AESKeys;
ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();
byte[] inputData = Convert.FromBase64String(decryptString);
byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, , inputData.Length);
return Encoding.UTF8.GetString(decryptedData);
}
catch { return string.Empty; }
}
private static byte[] DESKeys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
public static string DESEncode(this string encryptString, string encryptKey)
{
encryptKey = encryptKey.SubString(, "");
encryptKey = encryptKey.PadRight(, ' ');
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(, ));
byte[] rgbIV = DESKeys;
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, , inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
public static string DESDecode(this string decryptString, string decryptKey)
{
try
{
decryptKey = decryptKey.SubString(, "");
decryptKey = decryptKey.PadRight(, ' ');
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
byte[] rgbIV = DESKeys;
byte[] inputByteArray = Convert.FromBase64String(decryptString);
DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, , inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch { return string.Empty; }
}
public static string Base64Encode(this string encryptString)
{
byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(encryptString);
return Convert.ToBase64String(encbuff);
}
public static string Base64Decode(this string decryptString)
{
byte[] decbuff = Convert.FromBase64String(decryptString);
return System.Text.Encoding.UTF8.GetString(decbuff);
}
public static string RSADecrypt(this string s, string key)
{
string result = null;
if (string.IsNullOrEmpty(s)) throw new ArgumentException("An empty string value cannot be encrypted.");
if (string.IsNullOrEmpty(key)) throw new ArgumentException("Cannot decrypt using an empty key. Please supply a decryption key.");
CspParameters cspp = new CspParameters();
cspp.KeyContainerName = key;
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspp);
rsa.PersistKeyInCsp = true;
string[] decryptArray = s.Split(new string[] { "-" }, StringSplitOptions.None);
byte[] decryptByteArray = Array.ConvertAll<string, byte>(decryptArray, (a => Convert.ToByte(byte.Parse(a, System.Globalization.NumberStyles.HexNumber))));
byte[] bytes = rsa.Decrypt(decryptByteArray, true);
result = System.Text.UTF8Encoding.UTF8.GetString(bytes);
return result;
}
public static string RSAEncrypt(this string s, string key)
{
if (string.IsNullOrEmpty(s)) throw new ArgumentException("An empty string value cannot be encrypted.");
if (string.IsNullOrEmpty(key)) throw new ArgumentException("Cannot encrypt using an empty key. Please supply an encryption key.");
CspParameters cspp = new CspParameters();
cspp.KeyContainerName = key;
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(cspp);
rsa.PersistKeyInCsp = true;
byte[] bytes = rsa.Encrypt(System.Text.UTF8Encoding.UTF8.GetBytes(s), true);
return BitConverter.ToString(bytes);
}
public static string MD5(this string str)
{
string cl1 = str;
string pwd = "";
System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create();
// 加密后是一个字节类型的数组
byte[] s = md5.ComputeHash(Encoding.Unicode.GetBytes(cl1));
for (int i = ; i < s.Length; i++)
{
// 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
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
}
return pwd;
}
public static string MD5CSP(this string encypStr)
{
string retStr;
MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();
//创建md5对象
byte[] inputBye;
byte[] outputBye;
//使用GB2312编码方式把字符串转化为字节数组．
inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);
outputBye = m5.ComputeHash(inputBye);
retStr = System.BitConverter.ToString(outputBye);
retStr = retStr.Replace("-", "").ToLower();
return retStr;
}
public static string SHA256(this string str)
{
byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
SHA256Managed Sha256 = new SHA256Managed();
byte[] Result = Sha256.ComputeHash(SHA256Data);
return Convert.ToBase64String(Result);
//返回长度为44字节的字符串
}
}
}