CryptTool 封装了一些加密工具方法-实用

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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"))); }

}