java 整合Ucenter （authcode）函数的算法 博客分类： java 算法JavaJ#SecurityC++

自己用java整合ucenter，发现网上的都不能用。看看下php的authcode，照着写了下，发现怎么写都会有个bug，请高手搞一下。
---接口
package com.hq.encryptor;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import com.hq.encryptor.iface.PasswordEnDe;

/**
 * Ucenter论坛可逆加密算法
 * bug:解密后的字符串可能多一个或者2个字符。谁解决了请发我信箱[e-mail]
 * @author GAO
 * 
 */
public class UcenterPasswordEncryptor implements PasswordEnDe {
	// 密钥字符串
	private String ENCRYPTOR_KEY = "1234567890";
	private BASE64Decoder decoder = new BASE64Decoder();
	private BASE64Encoder encoder = new BASE64Encoder();

	public UcenterPasswordEncryptor() {

	}

	/**
	 * @param key 密钥
	 */
	public UcenterPasswordEncryptor(String key) {
		this.ENCRYPTOR_KEY = key;
	}

	// 加密
	public String encrypt(String password) {
		try {
			password=URLEncoder.encode(password, "UTF-8");//支持中文
			String key = ENCRYPTOR_KEY;
			int ckey_length = 4;
			key = getMd5String(key);
			String keya = getMd5String(key.substring(0, 16));
			String keyb = getMd5String(key.substring(16, 32));
			String min = String.valueOf(System.currentTimeMillis());
			min = "0.00000000 " + min.substring(0, min.length() - 3);
			String keyc = ckey_length > 0 ? getMd5String(String.valueOf(min))
					: "";
			keyc = keyc.substring(keyc.length() - 4, keyc.length());
			String cryptkey = keya + getMd5String(keya + keyc);
			int key_length = cryptkey.length();
			byte[] temp = null;
			String str_temp = "0000000000"
					+ getMd5String(password + keyb).substring(0, 16) + password;
			temp = str_temp.getBytes("UTF-8");
			int[] box = new int[256];
			for (int i = 0; i < box.length; i++) {
				box[i] = i;
			}

			char[] rndkey = new char[256];
			for (int i = 0; i <= 255; i++) {
				rndkey[i] = cryptkey.charAt(i % key_length);
			}

			for (int j = 0, i = 0; i < 256; i++) {
				j = (j + box[i] + (int) rndkey[i]) % 256;
				int tmp = box[i];
				box[i] = box[j];
				box[j] = tmp;
			}
			for (int a = 0, j = 0, i = 0; i < temp.length; i++) {
				a = (a + 1) % 256;
				j = (j + box[a]) % 256;
				int tmp = box[a];
				box[a] = box[j];
				box[j] = tmp;
				int gao = (int) temp[i];
				byte c = (byte) (gao ^ (box[(box[a] + box[j]) % 256]));
				temp[i] = c;
			}
			ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream();
			ByteArrayInputStream bytearrayinputstream = new ByteArrayInputStream(
					temp);
			encoder.encode(((InputStream) (bytearrayinputstream)),
					((OutputStream) (bytearrayoutputstream)));
			String s = bytearrayoutputstream.toString();
			return keyc + s.replace("=", "");
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException(e);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

	private String getMd5String(String password)
			throws NoSuchAlgorithmException {
		MessageDigest md = MessageDigest.getInstance("MD5");
		byte[] input = md.digest(password.getBytes());
		String hex = byteToHexString(input);
		return hex;
	}

	private String byteToHexString(byte[] res) {
		StringBuffer sb = new StringBuffer(res.length << 1);
		for (int i = 0; i < res.length; i++) {
			String digit = Integer.toHexString(0xFF & res[i]);
			if (digit.length() == 1) {
				digit = '0' + digit;
			}
			sb.append(digit);
		}
		return sb.toString();
	}
	//
	public boolean matches(String passwordToCheck, String storedPassword) {
		  if(storedPassword == null) {
	            throw new NullPointerException("storedPassword can not be null");
	        }
	        if(passwordToCheck == null) {
	            throw new NullPointerException("passwordToCheck can not be null");
	        }
	        
	        return encrypt(passwordToCheck).equals(storedPassword);
	}

	// 解密
	public String decrypt(String password) {
		try {
			
			int ckey_length = 4;
			String key = getMd5String(ENCRYPTOR_KEY);
			String keya = getMd5String(key.substring(0, 16));
			String min = String.valueOf(System.currentTimeMillis());
			min = "0.00000000 " + min.substring(0, min.length() - 3);
			
			String keyc = ckey_length > 0 ? password.substring(0, ckey_length)
					: "";
			String cryptkey = keya + getMd5String(keya + keyc);
			int key_length = cryptkey.length();
			byte[] temp = null;
			if(true){//这步为出bug的地方
				String t1 = password.substring(ckey_length, password.length());
		        ByteArrayInputStream bytearrayinputstream = new ByteArrayInputStream(t1.getBytes("UTF-8"));
		        ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream();
		        decoder.decodeBuffer(((InputStream) (bytearrayinputstream)), ((OutputStream) (bytearrayoutputstream)));
		        temp=bytearrayoutputstream.toByteArray();
			}
	        
			int[] box=new int[256];
			for (int i = 0; i <box.length; i++) {
				box[i] = i;
			}
			
			char[] rndkey = new char[256];
			for (int i = 0; i <= 255; i++) {
				rndkey[i] = cryptkey.charAt(i % key_length);
			}

			for (int j = 0, i = 0; i < 256; i++) {
				j = (j + box[i] + (int) rndkey[i]) % 256;
				int tmp = box[i];
				box[i] = box[j];
				box[j] = tmp;
			}
			StringBuffer sb = new StringBuffer();
			for(int a =0, j=0, i = 0; i < temp.length; i++) {
				a = (a + 1) % 256;
				j = (j + box[a]) % 256;
				int tmp = box[a];
				box[a] = box[j];
				box[j] = tmp;
				int gao=(int)temp[i]<0? (int)temp[i]+256:(int)temp[i];
				char c =(char)(gao ^ (box[(box[a] + box[j]) % 256]));
				sb.append(c);
			}  
			String lastStr= sb.substring(26, sb.length());
			return URLDecoder.decode(lastStr, "UTF-8");
		} catch (IOException e) {
			throw new RuntimeException(e);
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException(e);
		}
	}

}