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java明文解密源代码 java 加解密开源工具类

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java加密解密代码package com.cube.limail.util;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;/**
* 加密解密类
*/
publicclassEryptogram
{
privatestaticStringAlgorithm ="DES";
private String key="CB7A92E3D3491964";
//定义 加密算法,可用 DES,DESede,Blowfish
staticbooleandebug= false ;
/**
* 构造子注解.
*/
publicEryptogram ()
{
} /**
* 生成密钥
* @return byte[] 返回生成的密钥
* @throws exception 扔出异常.
*/
publicstaticbyte [] getSecretKey () throwsException
{
KeyGeneratorkeygen= KeyGenerator.getInstance (Algorithm );
SecretKeydeskey= keygen.generateKey ();
System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));
if(debug ) System.out.println ("生成密钥:"+bytesToHexString (deskey.getEncoded ()));
returndeskey.getEncoded ();
} /**
* 将指定的数据根据提供的密钥进行加密
* @param input 需要加密的数据
* @param key 密钥
* @return byte[] 加密后的数据
* @throws Exception
*/
publicstaticbyte [] encryptData (byte [] input ,byte [] key ) throwsException
{
SecretKeydeskey= newjavax.crypto.spec.SecretKeySpec (key ,Algorithm );
if(debug )
{
System.out.println ("加密前的二进串:"+byte2hex (input ));
System.out.println ("加密前的字符串:"+newString (input ));
} Cipherc1= Cipher.getInstance (Algorithm );
c1.init (Cipher.ENCRYPT_MODE ,deskey );
byte [] cipherByte =c1.doFinal (input );
if(debug ) System.out.println ("加密后的二进串:"+byte2hex (cipherByte ));
returncipherByte ;
} /**
* 将给定的已加密的数据通过指定的密钥进行解密
* @param input 待解密的数据
* @param key 密钥
* @return byte[] 解密后的数据
* @throws Exception
*/
publicstaticbyte [] decryptData (byte [] input ,byte [] key ) throwsException
{
SecretKeydeskey= newjavax.crypto.spec.SecretKeySpec (key ,Algorithm );
if(debug ) System.out.println ("解密前的信息:"+byte2hex (input ));
Cipherc1= Cipher.getInstance (Algorithm );
c1.init (Cipher.DECRYPT_MODE ,deskey );
byte [] clearByte =c1.doFinal (input );
if(debug )
{
System.out.println ("解密后的二进串:"+byte2hex (clearByte ));
System.out.println ("解密后的字符串:"+(newString (clearByte )));
} returnclearByte ;
} /**
* 字节码转换成16进制字符串
* @param byte[] b 输入要转换的字节码
* @return String 返回转换后的16进制字符串
*/
publicstaticStringbyte2hex (byte [] b )
{
Stringhs ="";
Stringstmp ="";
for(intn =0 ;n b.length ;n ++)
{
stmp =(java.lang.Integer.toHexString (b [n ]0XFF ));
if(stmp.length ()==1 ) hs =hs +"0"+stmp ;
elsehs =hs +stmp ;
if(n b.length -1 ) hs =hs +":";
} returnhs.toUpperCase ();
}
/**
* 字符串转成字节数组.
* @param hex 要转化的字符串.
* @return byte[] 返回转化后的字符串.
*/
public static byte[] hexStringToByte(String hex) {
int len = (hex.length() / 2);
byte[] result = new byte[len];
char[] achar = hex.toCharArray();
for (int i = 0; ilen; i++) {
int pos = i * 2;
result[i] = (byte) (toByte(achar[pos])4 | toByte(achar[pos + 1]));
}
return result;
}
private static byte toByte(char c) {
byte b = (byte) "0123456789ABCDEF".indexOf(c);
return b;
}
/**
* 字节数组转成字符串.
* @param String 要转化的字符串.
* @return 返回转化后的字节数组.
*/
public static final String bytesToHexString(byte[] bArray) {

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