java版3des加密程序，可与php兼容

时间:2009-03-29 22:35来源:未知 作者:admin 点击:次

代码： import java.io.UnsupportedEncodingException; import java.security.Key; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.Se

代码：

import java.io.UnsupportedEncodingException;

import java.security.Key;

import javax.crypto.Cipher;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESedeKeySpec;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;

public class DESCoder

{

private static BASE64Encoder base64 = new BASE64Encoder();

private static byte[] myIV = { 50, 51, 52, 53, 54, 55, 56, 57 };

//private static String strkey = "W9qPIzjaVGKUp7CKRk/qpCkg/SCMkQRu"; // 字节数必须是8的倍数

private static String strkey = "01234567890123456789012345678912";

public static String desEncrypt(String input) throws Exception

{

BASE64Decoder base64d = new BASE64Decoder();

DESedeKeySpec p8ksp = null;

p8ksp = new DESedeKeySpec(base64d.decodeBuffer(strkey));

Key key = null;

key = SecretKeyFactory.getInstance("DESede").generateSecret(p8ksp);

input = padding(input);

byte[] plainBytes = (byte[])null;

Cipher cipher = null;

byte[] cipherText = (byte[])null;

plainBytes = input.getBytes("UTF8");

cipher = Cipher.getInstance("DESede/CBC/NoPadding");

SecretKeySpec myKey = new SecretKeySpec(key.getEncoded(), "DESede");

IvParameterSpec ivspec = new IvParameterSpec(myIV);

cipher.init(1, myKey, ivspec);

cipherText = cipher.doFinal(plainBytes);

return removeBR(base64.encode(cipherText));

}

public static String desDecrypt(String cipherText) throws Exception

{

BASE64Decoder base64d = new BASE64Decoder();

DESedeKeySpec p8ksp = null;

p8ksp = new DESedeKeySpec(base64d.decodeBuffer(strkey));

Key key = null;

key = SecretKeyFactory.getInstance("DESede").generateSecret(p8ksp);

Cipher cipher = null;

byte[] inPut = base64d.decodeBuffer(cipherText);

cipher = Cipher.getInstance("DESede/CBC/NoPadding");

SecretKeySpec myKey = new SecretKeySpec(key.getEncoded(), "DESede");

IvParameterSpec ivspec = new IvParameterSpec(myIV);

cipher.init(2, myKey, ivspec);

byte[] output = removePadding(cipher.doFinal(inPut));

return new String(output, "UTF8");

}

private static String removeBR(String str) {

StringBuffer sf = new StringBuffer(str);

for (int i = 0; i < sf.length(); ++i)

{

if (sf.charAt(i) == '\n')

{

sf = sf.deleteCharAt(i);

}

}

for (int i = 0; i < sf.length(); ++i)

if (sf.charAt(i) == '\r')

{

sf = sf.deleteCharAt(i);

}

return sf.toString();

}

public static String padding(String str)

{

byte[] oldByteArray;

try

{

oldByteArray = str.getBytes("UTF8");

int numberToPad = 8 - oldByteArray.length % 8;

byte[] newByteArray = new byte[oldByteArray.length + numberToPad];

System.arraycopy(oldByteArray, 0, newByteArray, 0, oldByteArray.length);

for (int i = oldByteArray.length; i < newByteArray.length; ++i)

{

newByteArray[i] = 0;

}

return new String(newByteArray, "UTF8");

}

catch (UnsupportedEncodingException e)

{

System.out.println("Crypter.padding UnsupportedEncodingException");

}

return null;

}

public static byte[] removePadding(byte[] oldByteArray)

{

int numberPaded = 0;

for (int i = oldByteArray.length; i >= 0; --i)

{

if (oldByteArray[(i - 1)] != 0)

{

numberPaded = oldByteArray.length - i;

break;

}

}

byte[] newByteArray = new byte[oldByteArray.length - numberPaded];

System.arraycopy(oldByteArray, 0, newByteArray, 0, newByteArray.length);

return newByteArray;

}

public static void main(String args[])

{

try {

String desstr = DESCoder.desEncrypt("1qaz2ws");

String pstr = DESCoder.desDecrypt(desstr);

System.out.println("plainText:1qaz2ws");

System.out.println("Encode:"+desstr);

System.out.println("Decode:"+pstr);

} catch (Exception e) {

e.printStackTrace();

}

}

}

运行结果：

plainText:1qaz2ws

Encode:0GsXgYA8BuM=

Decode:1qaz2ws

和PHP的一样。

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