CryptTool 封装了一些加密工具方法-实用

王朝java/jsp·作者佚名  2006-01-09
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package com.bonjovi.utils.encrypt;

import java.io.*;

import java.security.*;

import javax.crypto.*;

import javax.crypto.spec.SecretKeySpec;

/**

* CryptTool 封装了一些加密工具方法, 包括 3DES, MD5 等.

*

* @author bonjovi

* @version 1.0

* 2004-05-12

*/

public class CryptTool {

public CryptTool() {

}

/**

* 生成3DES密钥.

*

* @param key_byte seed key

* @throws Exception

* @return javax.crypto.SecretKey Generated DES key

*/

public static javax.crypto.SecretKey genDESKey(byte[] key_byte)

throws Exception {

// javax.crypto.spec.DESKeySpec deskeyspec = new javax.crypto.spec.DESKeySpec(

// key_byte);

// javax.crypto.SecretKeyFactory skf = javax.crypto.SecretKeyFactory.

// getInstance("DES", "SunJCE");

// return (javax.crypto.SecretKey) skf.generateSecret(deskeyspec);

//KeyGenerator kg = KeyGenerator.getInstance("DESede");

SecretKey k = null;

k = new SecretKeySpec(key_byte, "DESede");

return k;

}

/**

* 3DES 解密(byte[]).

*

* @param key SecretKey

* @param crypt byte[]

* @throws Exception

* @return byte[]

*/

public static byte[] desDecrypt(javax.crypto.SecretKey key, byte[] crypt)

throws Exception {

javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("DESede");

cipher.init(javax.crypto.Cipher.DECRYPT_MODE, key);

return cipher.doFinal(crypt);

}

/**

* 3DES 解密(String).

*

* @param key SecretKey

* @param crypt byte[]

* @throws Exception

* @return byte[]

*/

public static String desDecrypt(javax.crypto.SecretKey key, String crypt)

throws Exception {

return new String(desDecrypt(key, crypt.getBytes()));

}

/**

* 3DES加密(byte[]).

*

* @param key SecretKey

* @param src byte[]

* @throws Exception

* @return byte[]

*/

public static byte[] desEncrypt(javax.crypto.SecretKey key, byte[] src)

throws Exception {

javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("DESede");

cipher.init(javax.crypto.Cipher.ENCRYPT_MODE, key);

return cipher.doFinal(src);

}

/**

* 3DES加密(String).

*

* @param key SecretKey

* @param src byte[]

* @throws Exception

* @return byte[]

*/

public static String desEncrypt(javax.crypto.SecretKey key, String src)

throws Exception {

return new String(desEncrypt(key, src.getBytes()));

}

/**

* MD5 摘要计算(byte[]).

*

* @param src byte[]

* @throws Exception

* @return byte[] 16 bit digest

*/

public static byte[] md5Digest(byte[] src) throws Exception {

java.security.MessageDigest alg =

java.security.MessageDigest.getInstance("MD5");

// MD5 is 16 bit message digest

return alg.digest(src);

}

/**

* MD5 摘要计算(String).

*

* @param src String

* @throws Exception

* @return String

*/

public static String md5Digest(String src) throws Exception {

return new String(md5Digest(src.getBytes()));

}

/**

* BASE64 编码.

*

* @param src String inputed string

* @return String returned string

*/

public static String base64Encode(String src) {

sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

return encoder.encode(src.getBytes());

}

/**

* BASE64 编码(byte[]).

*

* @param src byte[] inputed string

* @return String returned string

*/

public static String base64Encode(byte[] src) {

sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

return encoder.encode(src);

}

/**

* BASE64 解码.

*

* @param src String inputed string

* @return String returned string

*/

public static String base64Decode(String src) {

sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();

try {

return new String(decoder.decodeBuffer(src));

}

catch (Exception ex) {

return null;

}

}

/**

* BASE64 解码(to byte[]).

*

* @param src String inputed string

* @return String returned string

*/

public static byte[] base64DecodeToBytes(String src) {

sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();

try {

return decoder.decodeBuffer(src);

}

catch (Exception ex) {

return null;

}

}

/**

* 对给定字符进行 URL 编码.

*

* @param src String

* @return String

*/

public static String urlEncode(String src) {

try {

src = java.net.URLEncoder.encode(src, "GB2312");

return src;

}

catch (Exception ex) {

ex.printStackTrace();

}

return src;

}

/**

* 对给定字符进行 URL 解码

* @param value 解码前的字符串

* @return 解码后的字符串

*/

public String urlDecode(String value) {

try {

return java.net.URLDecoder.decode(value, "GB2312");

}

catch (Exception ex) {

ex.printStackTrace();

}

return value;

}

/** Test crypt */

public static void main(String[] args) {

byte src_byte[] = "1234567812345678".getBytes();

System.out.println(src_byte.length);

byte key_byte[] = "123456781234567812345678".getBytes();

// 3DES 24 bytes key

try {

// 生成DES密钥

javax.crypto.SecretKey deskey;

//生成DES密钥

// javax.crypto.KeyGenerator key = javax.crypto.KeyGenerator.getInstance(

// "DES");

// key.init(56);

// deskey = key.generateKey();

deskey = genDESKey(key_byte);

System.out.println("Generator DES KEY OK");

// DES加解密

byte[] encrypt, decrypt;

//加密

encrypt = desEncrypt(deskey, src_byte);

System.out.println("encrypt=" + new String(encrypt));

//解密

decrypt = desDecrypt(deskey, encrypt);

System.out.println("decrypt=" + new String(decrypt));

// String s = "12345678";

// //加密

// s = desEncrypt(deskey, s);

// System.out.println("encrypt=" + s);

// //解密

// s = desDecrypt(deskey, s);

// System.out.println("decrypt=" + s);

}

catch (Exception ex) {

ex.printStackTrace();

}

System.out.println("BASE64 Test:" + base64Decode(base64Encode("1234")));

}

}

 
 
 
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