只贴代码,看官自己理解
package com.easylotto.lottobar.util;
import java.security.MessageDigest;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import util.Hex;
public class SafeHelper {
/**
* 进行DES加密
* @param clearText String 明文
* @param secretKey String 密钥
* @return String 密文
*/
public static String encrypt(String srcMsg, String sKey) throws Exception{
String encMsg;
SecretKey secretKey;
BASE64Encoder encoder = new BASE64Encoder();
try {
SecretKeyFactory keyFac = SecretKeyFactory.getInstance("DES");
DESKeySpec desKeySpec;
desKeySpec = new DESKeySpec(sKey.getBytes());
secretKey = keyFac.generateSecret(desKeySpec);
Cipher desCipher = Cipher.getInstance("DES");
desCipher.init(Cipher.ENCRYPT_MODE, secretKey);
byte[] encText = desCipher.doFinal(srcMsg.getBytes());
encMsg = encoder.encode(encText);
} catch(Exception ex) {
System.out.println(ex);
throw new Exception("无法进行加密！");
}
return encMsg;
}
/**
* 进行DES解密
* @param cipherText String 密文
* @param secretKey String 密钥
* @return String 原文
*/
public static String decrypt(String encMsg, String sKey) throws Exception {
String srcMsg;
SecretKey secretKey;
BASE64Decoder decoder = new BASE64Decoder();
if(encMsg==null || encMsg.length()<=0) throw new Exception("指定的密文格式不正确！");
try {
SecretKeyFactory keyFac = SecretKeyFactory.getInstance("DES");
DESKeySpec desKeySpec;
desKeySpec = new DESKeySpec(sKey.getBytes());
secretKey = keyFac.generateSecret(desKeySpec);
Cipher desCipher = Cipher.getInstance("DES");
desCipher.init(Cipher.DECRYPT_MODE, secretKey);
byte[] srcText = desCipher.doFinal(decoder.decodeBuffer(encMsg));
srcMsg = new String(srcText);
} catch(Exception ex) {
throw new Exception("无法对信息进行解密！");
}
return srcMsg;
}
/**
* 对指定的文本进行MD5摘要
* @param text String 文本
* @return String 摘要
*/
public static String digest(String clearText) throws Exception {
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] digestText = md.digest(clearText.getBytes());
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(digestText).toString();
}
/**
* 对指定文本进行MD5摘要,但不进行Base64编码
* @param clearText
* @return
* @throws Exception
*/
public static String digestNotBase64(String clearText) throws Exception {
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] digestText = md.digest(clearText.getBytes());
return new String(digestText);
}
public static String digestHex(String clearText) throws Exception {
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] digestText = md.digest(clearText.getBytes());
byte[] bytes = Hex.encode(digestText);
return new String(bytes);
}
/**
* 对指定的文本进行BASE64编码
* @param text String 文本
* @return String 文本的BASE64编码
*/
public static String encode(String text) {
BASE64Encoder encoder =new BASE64Encoder();
return encoder.encode(text.getBytes()).toString();
}
/**
* 对字节数组进行64位编码
* @param bytes
* @return
*/
public static String encodeBase64(byte[] bytes) {
BASE64Encoder encoder =new BASE64Encoder();
return encoder.encode(bytes).toString();
}
/**
* 取得BASE64编码的原文
* @param text String BASE64编码文本
* @return String 原文
*/
public static String decode(String text) throws Exception {
BASE64Decoder decoder =new BASE64Decoder();
return new String(decoder.decodeBuffer(text)).toString();
}
public static String decode2Hex(String text) throws Exception {
BASE64Decoder decoder =new BASE64Decoder();
byte[] ary_byte=decoder.decodeBuffer(text);
byte[] ary_Hexbyte=Hex.encode(ary_byte);
return new String(ary_Hexbyte);
}
public static void main(String args[]) throws Exception{
/*
String pass="JI9g9d14/3Z91dYVEt1VlQ=="; //冯的账号数据库password字符串
String passRemoveBase64=decode(pass); //去base64后 ,MD5密文
String MD5_2time_str=digestHex(passRemoveBase64);
System.out.println("passRemoveBase64->"+passRemoveBase64);
System.out.println("2次MD冯的密码->"+MD5_2time_str);
*/
String tmp=digestHex(decode2Hex("4QrcOUm6Wau+VuBX8g+IPg=="));
System.out.println("tmp-->"+tmp);
}
}
16进制转换器
package util;
/**
* 字节数组转换成16进制
*/
public class Hex
{
private static HexTranslator encoder = new HexTranslator();
public static byte[] encode(
byte[] array)
{
return encode(array, 0, array.length);
}
public static byte[] encode(
byte[] array,
int off,
int length)
{
byte[] enc = new byte[length * 2];
encoder.encode(array, off, length, enc, 0);
return enc;
}
public static byte[] decode(
String string)
{
byte[] bytes = new byte[string.length() / 2];
String buf = string.toLowerCase();
for (int i = 0; i < buf.length(); i += 2)
{
char left = buf.charAt(i);
char right = buf.charAt(i+1);
int index = i / 2;
if (left < 'a')
{
bytes[index] = (byte)((left - '0') << 4);
}
else
{
bytes[index] = (byte)((left - 'a' + 10) << 4);
}
if (right < 'a')
{
bytes[index] += (byte)(right - '0');
}
else
{
bytes[index] += (byte)(right - 'a' + 10);
}
}
return bytes;
}
public static byte[] decode(
byte[] array)
{
byte[] bytes = new byte[array.length / 2];
encoder.decode(array, 0, array.length, bytes, 0);
return bytes;
}
}
public class HexTranslator
implements Translator
{
private static final byte[] hexTable =
{
(byte)'0', (byte)'1', (byte)'2', (byte)'3', (byte)'4', (byte)'5', (byte)'6', (byte)'7',
(byte)'8', (byte)'9', (byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e', (byte)'f'
};
/**
* size of the output block on encoding produced by getDecodedBlockSize()
* bytes.
*/
public int getEncodedBlockSize()
{
return 2;
}
public int encode(
byte[] in,
int inOff,
int length,
byte[] out,
int outOff)
{
for (int i = 0, j = 0; i < length; i++, j += 2)
{
out[outOff + j] = hexTable[(in[inOff] >> 4) & 0x0f];
out[outOff + j + 1] = hexTable[in[inOff] & 0x0f];
inOff++;
}
return length * 2;
}
/**
* size of the output block on decoding produced by getEncodedBlockSize()
* bytes.
*/
public int getDecodedBlockSize()
{
return 1;
}
public int decode(
byte[] in,
int inOff,
int length,
byte[] out,
int outOff)
{
int halfLength = length / 2;
byte left, right;
for (int i = 0; i < halfLength; i++)
{
left = in[inOff + i * 2];
right = in[inOff + i * 2 + 1];
if (left < (byte)'a')
{
out[outOff] = (byte)((left - '0') << 4);
}
else
{
out[outOff] = (byte)((left - 'a' + 10) << 4);
}
if (right < (byte)'a')
{
out[outOff] += (byte)(right - '0');
}
else
{
out[outOff] += (byte)(right - 'a' + 10);
}
outOff++;
}
return halfLength;
}
posted on 2008-06-19 11:45
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