Java Base6四、AES、SHA一、MD5加密算法

參考地址http://www.open-open.com/lib/view/open1392185662160.html

 

package com.example.decript;

 

import java.io.UnsupportedEncodingException;

import java.security.InvalidKeyException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.KeyGenerator;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

 

public class DecriptTest {

 

     public static String SHA1(String decript) {

         try {

             MessageDigest digest = java.security.MessageDigest

                     .getInstance( "SHA-1" );

             digest.update(decript.getBytes());

             byte messageDigest[] = digest.digest();

             // Create Hex String

             StringBuffer hexString = new StringBuffer();

             // 字節數組轉換爲 十六進制 數

             for ( int i = 0 ; i < messageDigest.length; i++) {

                 String shaHex = Integer.toHexString(messageDigest[i] & 0xFF );

                 if (shaHex.length() < 2 ) {

                     hexString.append( 0 );

                 }

                 hexString.append(shaHex);

             }

             return hexString.toString();

 

         } catch (NoSuchAlgorithmException e) {

             e.printStackTrace();

         }

         return "" ;

     }

 

     public static String SHA(String decript) {

         try {

             MessageDigest digest = java.security.MessageDigest

                     .getInstance( "SHA" );

             digest.update(decript.getBytes());

             byte messageDigest[] = digest.digest();

             // Create Hex String

             StringBuffer hexString = new StringBuffer();

             // 字節數組轉換爲 十六進制 數

             for ( int i = 0 ; i < messageDigest.length; i++) {

                 String shaHex = Integer.toHexString(messageDigest[i] & 0xFF );

                 if (shaHex.length() < 2 ) {

                     hexString.append( 0 );

                 }

                 hexString.append(shaHex);

             }

             return hexString.toString();

 

         } catch (NoSuchAlgorithmException e) {

             e.printStackTrace();

         }

         return "" ;

     }

 

     public static String MD5(String input) {

         try {

             // 得到MD5摘要算法的 MessageDigest 對象

             MessageDigest mdInst = MessageDigest.getInstance( "MD5" );

             // 使用指定的字節更新摘要

             mdInst.update(input.getBytes());

             // 得到密文

             byte [] md = mdInst.digest();

             // 把密文轉換成十六進制的字符串形式

             StringBuffer hexString = new StringBuffer();

             // 字節數組轉換爲 十六進制 數

             for ( int i = 0 ; i < md.length; i++) {

                 String shaHex = Integer.toHexString(md[i] & 0xFF );

                 if (shaHex.length() < 2 ) {

                     hexString.append( 0 );

                 }

                 hexString.append(shaHex);

             }

             return hexString.toString();

         } catch (NoSuchAlgorithmException e) {

             e.printStackTrace();

         }

         return "" ;

     }

 

     /**

      * 加密

      *

      * @param content

      *            須要加密的內容

      * @param password

      *            加密密碼

      * @return

      */

     public static byte [] encryptAES(String content, String password) {

         try {

             KeyGenerator kgen = KeyGenerator.getInstance( "AES" );

             kgen.init( 128 , new SecureRandom(password.getBytes()));

             SecretKey secretKey = kgen.generateKey();

             byte [] enCodeFormat = secretKey.getEncoded();

             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES" );

             Cipher cipher = Cipher.getInstance( "AES" ); // 建立密碼器

             byte [] byteContent = content.getBytes( "utf-8" );

             cipher.init(Cipher.ENCRYPT_MODE, key); // 初始化

             byte [] result = cipher.doFinal(byteContent);

             return result; // 加密

         } catch (NoSuchAlgorithmException e) {

             e.printStackTrace();

         } catch (NoSuchPaddingException e) {

             e.printStackTrace();

         } catch (InvalidKeyException e) {

             e.printStackTrace();

         } catch (UnsupportedEncodingException e) {

             e.printStackTrace();

         } catch (IllegalBlockSizeException e) {

             e.printStackTrace();

         } catch (BadPaddingException e) {

             e.printStackTrace();

         }

         return null ;

     }

 

     /**

      * 解密

      *

      * @param content

      *            待解密內容

      * @param password

      *            解密密鑰

      * @return

      */

     public static byte [] decryptAES( byte [] content, String password) {

         try {

             KeyGenerator kgen = KeyGenerator.getInstance( "AES" );

             kgen.init( 128 , new SecureRandom(password.getBytes()));

             SecretKey secretKey = kgen.generateKey();

             byte [] enCodeFormat = secretKey.getEncoded();

             SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES" );

             Cipher cipher = Cipher.getInstance( "AES" ); // 建立密碼器

             cipher.init(Cipher.DECRYPT_MODE, key); // 初始化

             byte [] result = cipher.doFinal(content);

             return result; // 加密

         } catch (NoSuchAlgorithmException e) {

             e.printStackTrace();

         } catch (NoSuchPaddingException e) {

             e.printStackTrace();

         } catch (InvalidKeyException e) {

             e.printStackTrace();

         } catch (IllegalBlockSizeException e) {

             e.printStackTrace();

         } catch (BadPaddingException e) {

             e.printStackTrace();

         }

         return null ;

     }

 

     /**

      * BASE64解密

      *

      * @param key

      * @return

      * @throws Exception

      */

     public static String decryptBASE64(String key) {

 

         return "" ;

     }

 

     /**

      * BASE64加密

      *

      * @param key

      * @return

      * @throws Exception

      */

     public static String encryptBASE64(String key) {

 

         return "" ;

     }

}