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

 

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(32, "");
encryptKey
= encryptKey.PadRight(32, ' ');

RijndaelManaged rijndaelProvider
= new RijndaelManaged();
rijndaelProvider.Key
= Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));
rijndaelProvider.IV
= AESKeys;
ICryptoTransform rijndaelEncrypt
= rijndaelProvider.CreateEncryptor();

byte[] inputData = Encoding.UTF8.GetBytes(encryptString);
byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData,0,inputData.Length);

return Convert.ToBase64String(encryptedData);
}
public static string AESDecode(this string decryptString, string decryptKey) {
try {
decryptKey
= decryptKey.SubString(32, "");
decryptKey
= decryptKey.PadRight(32, ' ');

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,0,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(8, "");
encryptKey
= encryptKey.PadRight(8, ' ');
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
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,
0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Convert.ToBase64String(mStream.ToArray());
}
public static string DESDecode(this string decryptString, string decryptKey) {
try {
decryptKey
= decryptKey.SubString(8, "");
decryptKey
= decryptKey.PadRight(8, ' ');
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,
0, 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 = 0; 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
}

}
}

 

posted @ 2010-07-05 13:12  熊哥  阅读(9597)  评论(1编辑  收藏  举报