文章目录

• JS常见加密 AES、DES、RSA、MD5、SHAI、HMAC、Base64 - Python/JS实现
• 前言
• 一、编码，加密？
• • 1. 什么是编码？
  • 2. 什么是加密？
• 二、常见编码
• • 1.Base64
  • 2. Base64 - JS实现
  • 3. Base64 - Python实现
  • 4.Unicode
  • 5.Urlencode
• 三、线性散列算法（签名算法）MD5
• • @L_301_13@
  • 2. MD5 - JS实现
  • 3. MD5 - Python实现
• 四、安全哈希算法 SHAI
• • 1. SHAI - JS实现
  • 2. SHAI - Python实现
• 五、散列消息鉴别码 HMAC
• • 1.HMAC - JS实现
  • 2. HMAC - Python实现
• 六、对称加密 AES、DES
• • 1. AES，DES介绍
  • 2. AES - JS实现
  • 3. DES - JS实现
  • 4. DES - Python实现
• 七、非对称加密RSA
• • 1. RSA介绍
  • 2. JS-代码示例
• 总结

package com.long;
/**
 * copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License,Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,software
 * distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/*
 * @author long
 *
 */
public class Base64 {
 private static final char[] legalChars = "ABCDEFGHIJKLMnopQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
   .tochararray();
 public static String encode(byte[] data) {
  int start = 0;
  int len = data.length;
  StringBuffer buf = new StringBuffer(data.length * 3 / 2);
  int end = len - 3;
  int i = start;
  int n = 0;
  while (i <= end) {
   int d = ((((int) data[i]) & 0x0ff) << 16)
     | ((((int) data[i + 1]) & 0x0ff) << 8)
     | (((int) data[i + 2]) & 0x0ff);
   buf.append(legalChars[(d >> 18) & 63]);
   buf.append(legalChars[(d >> 12) & 63]);
   buf.append(legalChars[(d >> 6) & 63]);
   buf.append(legalChars[d & 63]);
   i += 3;
   if (n++ >= 14) {
    n = 0;
    buf.append(" ");
   }
  }
  if (i == start + len - 2) {
   int d = ((((int) data[i]) & 0x0ff) << 16)
     | ((((int) data[i + 1]) & 255) << 8);
   buf.append(legalChars[(d >> 18) & 63]);
   buf.append(legalChars[(d >> 12) & 63]);
   buf.append(legalChars[(d >> 6) & 63]);
   buf.append("=");
  } else if (i == start + len - 1) {
   int d = (((int) data[i]) & 0x0ff) << 16;
   buf.append(legalChars[(d >> 18) & 63]);
   buf.append(legalChars[(d >> 12) & 63]);
   buf.append("==");
  }
  return buf.toString();
 }
 private static int decode(char c) {
  if (c >= 'A' && c <= 'Z')
   return ((int) c) - 65;
  else if (c >= 'a' && c <= 'z')
   return ((int) c) - 97 + 26;
  else if (c >= '0' && c <= '9')
   return ((int) c) - 48 + 26 + 26;
  else
   switch (c) {
   case '+':
    return 62;
   case '/':
    return 63;
   case '=':
    return 0;
   default:
    throw new RuntimeException("unexpected code: " + c);
   }
 }
 public static byte[] decode(String s) {
  ByteArrayOutputStream bos = new ByteArrayOutputStream();
  try {
   decode(s,bos);
  } catch (IOException e) {
   throw new RuntimeException();
  }
  byte[] decodedBytes = bos.toByteArray();
  try {
   bos.close();
   bos = null;
  } catch (IOException ex) {
   System.err.println("Error while decoding BASE64: " + ex.toString());
  }
  return decodedBytes;
 }
 private static void decode(String s,OutputStream os) throws IOException {
  int i = 0;
  int len = s.length();
  while (true) {
   while (i < len && s.charat(i) <= ' ')
    i++;
   if (i == len)
    break;
   int tri = (decode(s.charat(i)) << 18)
     + (decode(s.charat(i + 1)) << 12)
     + (decode(s.charat(i + 2)) << 6)
     + (decode(s.charat(i + 3)));
   os.write((tri >> 16) & 255);
   if (s.charat(i + 2) == '=')
    break;
   os.write((tri >> 8) & 255);
   if (s.charat(i + 3) == '=')
    break;
   os.write(tri & 255);
   i += 4;
  }
 }
}

package com.long;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
 * AES加密解密算法
 * 
 * @author long
 * 
 */
public class Encryption {
 private final static String HEX = "0123456789ABCDEF";
 public static String encrypt(String seed,String cleartext)
   throws Exception {
  byte[] rawKey = getRawKey(seed.getBytes());
  byte[] result = encrypt(rawKey,cleartext.getBytes());
  return toHex(result);
 }
 public static String decrypt(String seed,String encrypted)
   throws Exception {
  byte[] rawKey = getRawKey(seed.getBytes());
  byte[] enc = toByte(encrypted);
  byte[] result = decrypt(rawKey,enc);
  return new String(result);
 }
 private static byte[] getRawKey(byte[] seed) throws Exception {
  KeyGenerator kgen = KeyGenerator.getInstance("AES");
  SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
  sr.setSeed(seed);
  kgen.init(128,sr); // 192 and 256 bits may not be available
  SecretKey skey = kgen.generateKey();
  byte[] raw = skey.getEncoded();
  return raw;
 }
 private static byte[] encrypt(byte[] raw,byte[] clear) throws Exception {
  SecretKeySpec skeySpec = new SecretKeySpec(raw,"AES");
  Cipher cipher = Cipher.getInstance("AES");
  cipher.init(Cipher.ENCRYPT_MODE,skeySpec);
  byte[] encrypted = cipher.doFinal(clear);
  return encrypted;
 }
 private static byte[] decrypt(byte[] raw,byte[] encrypted)
   throws Exception {
  SecretKeySpec skeySpec = new SecretKeySpec(raw,"AES");
  Cipher cipher = Cipher.getInstance("AES");
  cipher.init(Cipher.DECRYPT_MODE,skeySpec);
  byte[] decrypted = cipher.doFinal(encrypted);
  return decrypted;
 }
 public static String toHex(String txt) {
  return toHex(txt.getBytes());
 }
 public static String fromHex(String hex) {
  return new String(toByte(hex));
 }
 public static byte[] toByte(String hexString) {
  int len = hexString.length() / 2;
  byte[] result = new byte[len];
  for (int i = 0; i < len; i++)
   result[i] = Integer.valueOf(hexString.substring(2 * i,2 * i + 2),16).byteValue();
  return result;
 }
 public static String toHex(byte[] buf) {
  if (buf == null)
   return "";
  StringBuffer result = new StringBuffer(2 * buf.length);
  for (int i = 0; i < buf.length; i++) {
   appendHex(result,buf[i]);
  }
  return result.toString();
 }
 private static void appendHex(StringBuffer sb,byte b) {
  sb.append(HEX.charat((b >> 4) & 0x0f)).append(HEX.charat(b & 0x0f));
 }
}

import java.security.Key; 
import java.security.KeyFactory; 
import java.security.KeyPair; 
import java.security.KeyPairGenerator; 
import java.security.PrivateKey; 
import java.security.PublicKey; 
import java.security.interfaces.RSAPrivateKey; 
import java.security.interfaces.RSAPublicKey; 
import java.security.spec.PKCS8EncodedKeySpec; 
import java.security.spec.X509EncodedKeySpec; 
import javax.crypto.Cipher; 
import sun.misc.BASE64Decoder; 
import sun.misc.BASE64Encoder; 
public class RSAHelper { 
  public static PublicKey getPublicKey(String key) throws Exception { 
   byte[] keyBytes; 
   keyBytes = (new BASE64Decoder()).decodeBuffer(key); 
   X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); 
   KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 
   PublicKey publicKey = keyFactory.generatePublic(keySpec); 
   return publicKey; 
  } 
  public static PrivateKey getPrivateKey(String key) throws Exception { 
   byte[] keyBytes; 
   keyBytes = (new BASE64Decoder()).decodeBuffer(key); 
   PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes); 
   KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 
   PrivateKey privateKey = keyFactory.generatePrivate(keySpec); 
   return privateKey; 
  } 
  public static String getKeyString(Key key) throws Exception { 
   byte[] keyBytes = key.getEncoded(); 
   String s = (new BASE64Encoder()).encode(keyBytes); 
   return s; 
  } 
  public static void main(String[] args) throws Exception { 
   KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA"); 
   //密钥位数 
   keyPairGen.initialize(1024); 
   //密钥对 
   KeyPair keyPair = keyPairGen.generateKeyPair(); 
   // 公钥 
   PublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); 
   // 私钥 
   PrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); 
   String publicKeyString = getKeyString(publicKey); 
   System.out.println("public:\n" + publicKeyString); 
   String privateKeyString = getKeyString(privateKey); 
   System.out.println("private:\n" + privateKeyString); 
   //加解密类 
   Cipher cipher = Cipher.getInstance("RSA");//Cipher.getInstance("RSA/ECB/PKCS1Padding"); 
   //明文 
   byte[] plainText = "我们都很好！邮件：@sina.com".getBytes(); 
   //加密 
   cipher.init(Cipher.ENCRYPT_MODE,publicKey); 
   byte[] enBytes = cipher.doFinal(plainText); 
   //通过密钥字符串得到密钥 
   publicKey = getPublicKey(publicKeyString); 
   privateKey = getPrivateKey(privateKeyString); 
   //解密 
   cipher.init(Cipher.DECRYPT_MODE,privateKey); 
   byte[]deBytes = cipher.doFinal(enBytes); 
   publicKeyString = getKeyString(publicKey); 
   System.out.println("public:\n" +publicKeyString); 
   privateKeyString = getKeyString(privateKey); 
   System.out.println("private:\n" + privateKeyString); 
   String s = new String(deBytes); 
   System.out.println(s); 
  } 
}

1. /** 
2.  * BASE64解密 
3.  *  
4.  * @param key 
5.  * @return 
6.  * @throws Exception 
7.  */  
8. public static byte[] decryptBASE64(String key) throws Exception {  
9.     return (new BASE64Decoder()).decodeBuffer(key);  
10. }  
11.   
12. /** 
13.  * BASE64加密 
14.  *  
15.  * @param key 
16.  * @return 
17.  * @throws Exception 
18.  */  
19. public static String encryptBASE64(byte[] key) throws Exception {  
20.     return (new BASE64Encoder()).encodeBuffer(key);  
21. }  

1. /** 
2.  * MD5加密 
3.  *  
4.  * @param data 
5.  * @return 
6.  * @throws Exception 
7.  */  
8. public static byte[] encryptMD5(byte[] data) throws Exception {  
9.   
10.     MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);  
11.     md5.update(data);  
12.   
13.     return md5.digest();  
14.   
15. }  

1.     /** 
2.      * SHA加密 
3.      *  
4.      * @param data 
5.      * @return 
6.      * @throws Exception 
7.      */  
8.     public static byte[] encryptSHA(byte[] data) throws Exception {  
9.   
10.         MessageDigest sha = MessageDigest.getInstance(KEY_SHA);  
11.         sha.update(data);  
12.   
13.         return sha.digest();  
14.   
15.     }  
16. }  

1. /** 
2.  * 初始化HMAC密钥 
3.  *  
4.  * @return 
5.  * @throws Exception 
6.  */  
7. public static String initMacKey() throws Exception {  
8.     KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);  
9.   
10.     SecretKey secretKey = keyGenerator.generateKey();  
11.     return encryptBASE64(secretKey.getEncoded());  
12. }  
13.   
14. /** 
15.  * HMAC加密 
16.  *  
17.  * @param data 
18.  * @param key 
19.  * @return 
20.  * @throws Exception 
21.  */  
22. public static byte[] encryptHMAC(byte[] data, String key) throws Exception {  
23.   
24.     SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);  
25.     Mac mac = Mac.getInstance(secretKey.getAlgorithm());  
26.     mac.init(secretKey);  
27.   
28.     return mac.doFinal(data);  
29.   
30. }  

1. import java.security.MessageDigest;  
2.   
3. import javax.crypto.KeyGenerator;  
4. import javax.crypto.Mac;  
5. import javax.crypto.SecretKey;  
6.   
7. import sun.misc.BASE64Decoder;  
8. import sun.misc.BASE64Encoder;  
9.   
10. /** 
11.  * 基础加密组件 
12.  *  
13.  * @author 梁栋 
14.  * @version 1.0 
15.  * @since 1.0 
16.  */  
17. public abstract class Coder {  
18.     public static final String KEY_SHA = "SHA";  
19.     public static final String KEY_MD5 = "MD5";  
20.   
21.     /** 
22.      * MAC算法可选以下多种算法 
23.      *  
24.      * <pre> 
25.      * HmacMD5  
26.      * HmacSHA1  
27.      * HmacSHA256  
28.      * HmacSHA384  
29.      * HmacSHA512 
30.      * </pre> 
31.      */  
32.     public static final String KEY_MAC = "HmacMD5";  
33.   
34.     /** 
35.      * BASE64解密 
36.      *  
37.      * @param key 
38.      * @return 
39.      * @throws Exception 
40.      */  
41.     public static byte[] decryptBASE64(String key) throws Exception {  
42.         return (new BASE64Decoder()).decodeBuffer(key);  
43.     }  
44.   
45.     /** 
46.      * BASE64加密 
47.      *  
48.      * @param key 
49.      * @return 
50.      * @throws Exception 
51.      */  
52.     public static String encryptBASE64(byte[] key) throws Exception {  
53.         return (new BASE64Encoder()).encodeBuffer(key);  
54.     }  
55.   
56.     /** 
57.      * MD5加密 
58.      *  
59.      * @param data 
60.      * @return 
61.      * @throws Exception 
62.      */  
63.     public static byte[] encryptMD5(byte[] data) throws Exception {  
64.   
65.         MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);  
66.         md5.update(data);  
67.   
68.         return md5.digest();  
69.   
70.     }  
71.   
72.     /** 
73.      * SHA加密 
74.      *  
75.      * @param data 
76.      * @return 
77.      * @throws Exception 
78.      */  
79.     public static byte[] encryptSHA(byte[] data) throws Exception {  
80.   
81.         MessageDigest sha = MessageDigest.getInstance(KEY_SHA);  
82.         sha.update(data);  
83.   
84.         return sha.digest();  
85.   
86.     }  
87.   
88.     /** 
89.      * 初始化HMAC密钥 
90.      *  
91.      * @return 
92.      * @throws Exception 
93.      */  
94.     public static String initMacKey() throws Exception {  
95.         KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);  
96.   
97.         SecretKey secretKey = keyGenerator.generateKey();  
98.         return encryptBASE64(secretKey.getEncoded());  
99.     }  
100.   
101.     /** 
102.      * HMAC加密 
103.      *  
104.      * @param data 
105.      * @param key 
106.      * @return 
107.      * @throws Exception 
108.      */  
109.     public static byte[] encryptHMAC(byte[] data, String key) throws Exception {  
110.   
111.         SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);  
112.         Mac mac = Mac.getInstance(secretKey.getAlgorithm());  
113.         mac.init(secretKey);  
114.   
115.         return mac.doFinal(data);  
116.   
117.     }  
118. }  

1. import static org.junit.Assert.*;  
2.   
3. import org.junit.Test;  
4.   
5. /** 
6.  *  
7.  * @author 梁栋 
8.  * @version 1.0 
9.  * @since 1.0 
10.  */  
11. public class CoderTest {  
12.   
13.     @Test  
14.     public void test() throws Exception {  
15.         String inputStr = "简单加密";  
16.         System.err.println("原文:/n" + inputStr);  
17.   
18.         byte[] inputData = inputStr.getBytes();  
19.         String code = Coder.encryptBASE64(inputData);  
20.   
21.         System.err.println("BASE64加密后:/n" + code);  
22.   
23.         byte[] output = Coder.decryptBASE64(code);  
24.   
25.         String outputStr = new String(output);  
26.   
27.         System.err.println("BASE64解密后:/n" + outputStr);  
28.   
29.         // 验证BASE64加密解密一致性  
30.         assertEquals(inputStr, outputStr);  
31.   
32.         // 验证MD5对于同一内容加密是否一致  
33.         assertArrayEquals(Coder.encryptMD5(inputData), Coder  
34.                 .encryptMD5(inputData));  
35.   
36.         // 验证SHA对于同一内容加密是否一致  
37.         assertArrayEquals(Coder.encryptSHA(inputData), Coder  
38.                 .encryptSHA(inputData));  
39.   
40.         String key = Coder.initMacKey();  
41.         System.err.println("Mac密钥:/n" + key);  
42.   
43.         // 验证HMAC对于同一内容，同一密钥加密是否一致  
44.         assertArrayEquals(Coder.encryptHMAC(inputData, key), Coder.encryptHMAC(  
45.                 inputData, key));  
46.   
47.         BigInteger md5 = new BigInteger(Coder.encryptMD5(inputData));  
48.         System.err.println("MD5:/n" + md5.toString(16));  
49.   
50.         BigInteger sha = new BigInteger(Coder.encryptSHA(inputData));  
51.         System.err.println("SHA:/n" + sha.toString(32));  
52.   
53.         BigInteger mac = new BigInteger(Coder.encryptHMAC(inputData, inputStr));  
54.         System.err.println("HMAC:/n" + mac.toString(16));  
55.     }  
56. }  

1. 原文:  
2. 简单加密  
3. BASE64加密后:  
4. 566A5Y2V5Yqg5a+G  
5.   
6. BASE64解密后:  
7. 简单加密  
8. Mac密钥:  
9. uGxdHC+6ylRDaik++leFtGwiMbuYUJ6mqHWyhSgF4trVkVBBSQvY/a22xU8XT1RUemdCWW155Bke  
10. pBIpkd7QHg==  
11.   
12. MD5:  
13. -550b4d90349ad4629462113e7934de56  
14. SHA:  
15. 91k9vo7p400cjkgfhjh0ia9qthsjagfn  
16. HMAC:  
17. 2287d192387e95694bdbba2fa941009a  

异或可逆加密操作：A对B异或结果C；A对C异或结果为A；二次异或是本身
package en_decode;

public class test {
	public static String xor(String input) {
		char[]chars=input.toCharArray();
		for(int i=0;i<chars.length;i++) {
			chars[i]=(char) (chars[i]^3000); //^异或
		}
		String new1=new String(chars);
		return new1;
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String aString="abc";
		aString=xor(aString);
		System.out.println(aString);
		
		aString=xor(aString);
		System.out.println(aString);
	}

}

package en_decode;

import org.apache.commons.codec.digest.DigestUtils;

public class test {
//	public static String xor(String input) {
//		char[]chars=input.toCharArray();
//		for(int i=0;i<chars.length;i++) {
//			chars[i]=(char) (chars[i]^3000); //^异或
//		}
//		String new1=new String(chars);
//		return new1;
//	}
//	
	public static String MD5encode(byte[] input) {//速度快，不可逆 安全性低
		
		return DigestUtils.md5Hex(input);
		
	}
	public static String SHAencode(byte[] input) {//速度慢 不可逆 安全性高
		
		return DigestUtils.sha256Hex(input);
		
	}
	public static void main(String[] args) {
//		// TODO Auto-generated method stub
//		String aString="abc";
//		aString=xor(aString);
//		System.out.println(aString);
//		
//		aString=xor(aString);
//		System.out.println(aString);
		String gg="hello";
		String t1=MD5encode(gg.getBytes());
		System.out.println(t1);

		String t2=SHAencode(gg.getBytes());
		System.out.println(t2);
	}

}

package en_decode;
import org.apache.commons.codec.binary.Base64;
public class test {

    public static byte[] decode( String gg) {  
        return Base64.decodeBase64(gg);  
    }  
    public static String encode(byte[] bytes) {  
        return new String(Base64.encodeBase64(bytes));  
    }  
	public static void main(String[] args) {

		String gg="hello";
		gg=encode(gg.getBytes());
		System.out.println(gg);
		byte[]hh=decode(gg);
		System.out.println(new String(hh));
		
	}


}

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace ClassLibrary1
{
    class Code
    {
        //1、base64  to  string
        public static string Base64Encrypt(string strPath)
        {
            byte[] bpath = Convert.FromBase64String(strPath);
            string returnData = Encoding.Default.GetString(bpath);
            return returnData;
        }


        //2、string   to  base64
        public static string Base64DesEncrypt(string strPath)
        {
            Encoding encode = Encoding.ASCII;
            byte[] bytedata = encode.GetBytes(strPath);
            string returnData = Convert.ToBase64String(bytedata, 0, bytedata.Length);
            return returnData;
        }

        /// <summary>
        /// 对字符串进MD5加密
        /// </summary>
        /// <param name="sourceStr">源类型</param>
        /// <returns>加密后字符串</returns>
        public static string Md5Encrypt(string sourceStr)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            //将要加密的字符串转换成字节数组
            byte[] palindata = Encoding.Default.GetBytes(sourceStr);
            //通过字节数组进行加密
            byte[] encryptdata = md5.ComputeHash(palindata);
            //将加密后的字节数组转换成字符串
            string returnData = Convert.ToBase64String(encryptdata);
            return returnData;
        }

        /// <summary>
        ///  Md5加密
        /// </summary>
        /// <param name="pToEncrypt">要加密的string</param>
        /// <param name="sKey">要加密的key</param>
        /// <returns></returns>
        public static string Md5Encrypt(string pToEncrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
            des.Key = Encoding.ASCII.GetBytes(sKey);
            des.IV = Encoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            var s = ret.ToString();
            return s;
        }
        
        /// <summary>
        ///  Md5解密
        /// </summary>
        /// <param name="pToDecrypt">解密string</param>
        /// <param name="sKey">解密key(要8位数)</param>
        /// <returns></returns>
        public static string Md5Decrypt(string pToDecrypt, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte) i;
            }
            des.Key = Encoding.ASCII.GetBytes(sKey);
            des.IV = Encoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            return Encoding.Default.GetString(ms.ToArray());
        }


        public static CspParameters Param;
        /// <summary>
        /// 进行 RSA 加密
        /// </summary>
        /// <param name="sourceStr">源字符串</param>
        /// <returns>加密后字符串</returns>
        public static string RsaEncrypt(string sourceStr)
        {
            Param = new CspParameters();
            //密匙容器的名称，保持加密解密一致才能解密成功
            Param.KeyContainerName = "Navis";
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(Param))
            {
                //将要加密的字符串转换成字节数组
                byte[] plaindata = Encoding.Default.GetBytes(sourceStr);
                //通过字节数组进行加密
                byte[] encryptdata = rsa.Encrypt(plaindata, false);
                //将加密后的字节数组转换成字符串
                return Convert.ToBase64String(encryptdata);
            }
        }

        /// <summary>
        /// 通过RSA 加密方式进行解密
        /// </summary>
        /// <param name="codingStr">加密字符串</param>
        /// <returns>解密后字符串</returns>
        public static string RsaDesEncrypt(string codingStr)
        {
            Param = new CspParameters();
            Param.KeyContainerName = "Navis";
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(Param))
            {
                byte[] encryptdata = Convert.FromBase64String(codingStr);
                byte[] decryptdata = rsa.Decrypt(encryptdata, false);
                return Encoding.Default.GetString(decryptdata);
            }
        }
    }
}