java加密算法

 

Base64可以解密、MD5、SHA、不行、也算不上是加密算法！

Base64可以解密、MD5、SHA、不行、也算不上是加密算法！

package com.boxun.crm.test;

import java.security.MessageDigest;


import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public abstract class Base64Test {

    private static final String KEY_MD5 = "MD5";
    private static final String KEY_SHA = "SHA";
    /**
     * MAC算法可選以下多種算法
     *
     * <pre>
     * HmacMD5
     * HmacSHA1
     * HmacSHA256
     * HmacSHA384
     * HmacSHA512
     * </pre>
     */
    public static final String KEY_MAC = "HmacMD5";

    /**
     * BASE64解密
     *
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] decryptBASE64(String key) throws Exception {
        return (new BASE64Decoder()).decodeBuffer(key);
    }

    /**
     * BASE64加密
     *
     * @param key
     * @return
     * @throws Exception
     */
    public static String encryptBASE64(byte[] key) throws Exception {
        return (new BASE64Encoder()).encodeBuffer(key);
    }


    /**
     * MD5加密
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static byte[] encryptMD5(byte[] data) throws Exception {
        /**-- getInstance(String algorithm)返回實現指定摘要算法的 MessageDigest 對象  --*/
        MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);
        md5.update(data);
        return md5.digest();
    }


    /**
     * SHA加密
     *
     * @param data
     * @return
     * @throws Exception
     */
    public static byte[] encryptSHA(byte[] data) throws Exception {
        MessageDigest sha = MessageDigest.getInstance(KEY_SHA);
        sha.update(data);
        return sha.digest();
    }

    /**
     * 初始化HMAC密鑰
     *
     * @return
     * @throws Exception
     */
    public static String initMacKey() throws Exception {
        /**-- getInstance(String algorithm)返回生成指定算法的祕密密鑰的 KeyGenerator 對象  --*/
        KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);
        /**-- generateKey()生成一個密鑰  --*/
        SecretKey secretKey = keyGenerator.generateKey();
        /**-- secretKey.getEncoded()返回基本編碼格式的密鑰，如果此密鑰不支持編碼，則返回 null --
         * encryptBASE64調用Base64加密方法
         */
        return encryptBASE64(secretKey.getEncoded());
    }

    /**
     * HMAC加密
     *
     * @param data
     * @param key
     * @return
     * @throws Exception
     */
    public static byte[] encryptHMAC(byte[] data, String key) throws Exception {
        SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);
        Mac mac = Mac.getInstance(secretKey.getAlgorithm());
        mac.init(secretKey);
        return mac.doFinal(data);
    }

}

package com.boxun.crm.test;

import java.security.MessageDigest;


import javax.crypto.KeyGenerator;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public abstract class Base64Test {

	private static final String KEY_MD5 = "MD5";
	private static final String KEY_SHA = "SHA";
	/**  
	 * MAC算法可選以下多種算法  
	 *   
	 * <pre>  
	 * HmacMD5   
	 * HmacSHA1   
	 * HmacSHA256   
	 * HmacSHA384   
	 * HmacSHA512  
	 * </pre>  
	 */  
	public static final String KEY_MAC = "HmacMD5";   

	/**  
	 * BASE64解密  
	 *   
	 * @param key  
	 * @return  
	 * @throws Exception  
	 */  
	public static byte[] decryptBASE64(String key) throws Exception {   
		return (new BASE64Decoder()).decodeBuffer(key);   
	}   

	/**  
	 * BASE64加密  
	 *   
	 * @param key  
	 * @return  
	 * @throws Exception  
	 */  
	public static String encryptBASE64(byte[] key) throws Exception {   
		return (new BASE64Encoder()).encodeBuffer(key);   
	}


	/**  
	 * MD5加密  
	 *   
	 * @param data  
	 * @return  
	 * @throws Exception  
	 */  
	public static byte[] encryptMD5(byte[] data) throws Exception {  
		/**-- getInstance(String algorithm)返回實現指定摘要算法的 MessageDigest 對象  --*/
		MessageDigest md5 = MessageDigest.getInstance(KEY_MD5);   
		md5.update(data);   
		return md5.digest();   
	} 


	/**  
	 * SHA加密  
	 *   
	 * @param data  
	 * @return  
	 * @throws Exception  
	 */  
	public static byte[] encryptSHA(byte[] data) throws Exception {   
		MessageDigest sha = MessageDigest.getInstance(KEY_SHA);   
		sha.update(data);   
		return sha.digest();   
	} 

	/**  
	 * 初始化HMAC密鑰  
	 *   
	 * @return  
	 * @throws Exception  
	 */  
	public static String initMacKey() throws Exception { 
		/**-- getInstance(String algorithm)返回生成指定算法的祕密密鑰的 KeyGenerator 對象  --*/
		KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_MAC);
		/**-- generateKey()生成一個密鑰  --*/
		SecretKey secretKey = keyGenerator.generateKey(); 
		/**-- secretKey.getEncoded()返回基本編碼格式的密鑰，如果此密鑰不支持編碼，則返回 null --
		 * encryptBASE64調用Base64加密方法
		 */
		return encryptBASE64(secretKey.getEncoded());   
	}   

	/**  
	 * HMAC加密  
	 *   
	 * @param data  
	 * @param key  
	 * @return  
	 * @throws Exception  
	 */  
	public static byte[] encryptHMAC(byte[] data, String key) throws Exception {   
		SecretKey secretKey = new SecretKeySpec(decryptBASE64(key), KEY_MAC);   
		Mac mac = Mac.getInstance(secretKey.getAlgorithm());   
		mac.init(secretKey);   
		return mac.doFinal(data);   
	}

}

下面是main方法類：

下面是main方法類：

<PRE class=java name="code">package com.boxun.crm.test;

import java.math.BigInteger;


/**
 *
 * @author 旦旦而學
 * @version 1.0
 * @since 1.0
 */
public class CoderTest {

    public void test() throws Exception {
        String inputStr = "單項加密";
        System.err.println("原值:\t" + inputStr);

        byte[] inputData = inputStr.getBytes();
        String code = Base64Test.encryptBASE64(inputData);

        System.err.println("BASE64加密後:\t" + code);

        byte[] output = Base64Test.decryptBASE64(code);

        String outputStr = new String(output);

        System.err.println("BASE64解密後:\t" + outputStr);

        // 驗證BASE64加密解密一致性
        assertEquals(inputStr, outputStr);

        // 驗證MD5對於同一內容加密是否一致
        assertArrayEquals(Base64Test.encryptMD5(inputData), Base64Test
                .encryptMD5(inputData),"MD5");

        // 驗證SHA對於同一內容加密是否一致
        assertArrayEquals(Base64Test.encryptSHA(inputData), Base64Test
                .encryptSHA(inputData),"SHA");

        String key = Base64Test.initMacKey();
        System.err.println("Mac密鑰:\t" + key);

        // 驗證HMAC對於同一內容，同一密鑰加密是否一致
        assertArrayEquals(Base64Test.encryptHMAC(inputData, key), Base64Test.encryptHMAC(
                inputData, key),"HMAC");

        BigInteger md5 = new BigInteger(Base64Test.encryptMD5(inputData));
        System.err.println("MD5:\t" + md5.toString(16));

        BigInteger sha = new BigInteger(Base64Test.encryptSHA(inputData));
        System.err.println("SHA:\t" + sha.toString(32));

        BigInteger mac = new BigInteger(Base64Test.encryptHMAC(inputData, inputStr));
        System.err.println("HMAC:\t" + mac.toString(16));
    }

    private void assertArrayEquals(byte[] encryptMD5, byte[] encryptMD52,String type) {
        String out = "不一致" ;
        byte[] by = encryptMD5 ;
        byte[] by2 = encryptMD52 ;
        String byt = "" ;
        String byt2 = "" ;
        //轉換成16進制數據
        for (int i = 0; i < by.length; i++) {
            byt += Integer.toHexString((by[i] & 0xFF) | 0x100).substring(1,3);
        }
        for (int i = 0; i < by2.length; i++) {
            byt2 += Integer.toHexString((by2[i] & 0xFF) | 0x100).substring(1,3);
        }
        if(byt.equals(byt2)){
            out = "一致" ;
        }
        System.out.println("驗證"+type+"對於同一內容,同一密鑰加密是否一致:"+out);
        System.out.println(byt + "  "+type+"  " + byt2);
    }

    private void assertEquals(String inputStr, String outputStr) {
        String out = "不一致" ;
        if(inputStr.equals(outputStr)){
            out = "一致" ;
        }
        System.out.println("驗證BASE64加密解密一致性:"+out);
    }
    /**
     * 2011-7-5上午10:43:51
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        CoderTest te = new CoderTest();
        te.test();
    }



}