java实现rc4算法后十六进制转换

[xiaoqiulqs]

其它系统给我们这个系统发过来用户名和密码，只能以URL形式发送，必须加密，目前采用的是RC4算法。
但RC4加密后的数据存在乱码字符，且通过URL形式传送过来时需要转换成十六进制。
于是产生问题:
通过RC4加密后的数据再转换成十六进制后，解密时通过16进制转换后再进行解密后的数据与加密前的数据不一致
public class RC4 {
public static String HloveyRC4(String aInput, String aKey) {
int[] iS = new int[256];
byte[] iK = new byte[256];
for (int i = 0; i < 256; i++) {
iS[i] = i;
}
int j = 0;
for (short i = 0; i < 256; i++) {
iK[i] = (byte) aKey.charAt((i % aKey.length())); // charAt函数的作用是返回指定索引位置处的字符
}
for (int i = 0; i < 255; i++) {
j = (j + iS[i] + iK[i]) % 256;
int temp = iS[i];
iS[i] = iS[j];
iS[j] = temp;
}
int i = 0;
j = 0;
char[] iInputChar = aInput.toCharArray();
char[] iOutputChar = new char[iInputChar.length];
for (short x = 0; x < iInputChar.length; x++) {
i = (i + 1) % 256;
j = (j + iS[i]) % 256;
int temp = iS[i];
iS[i] = iS[j];
iS[j] = temp;
int t = (iS[i] + (iS[j] % 256)) % 256;
int iY = iS[t];
char iCY = (char) iY;
iOutputChar[x] = (char) (iInputChar[x] ^ iCY);
}
return new String(iOutputChar);
}

public static String EncryptRC4(String aInput, String aKey) {
String str = HloveyRC4(aInput, aKey);
str = bin2hex(str);
return str;
}

public static String DecryptRC4(String aInput, String aKey) {
aInput = hex2bin(aInput);
String str = HloveyRC4(aInput, aKey);
return str;
}

/**
* 字符串转换成十六进制值
*
* @param bin
* String 我们看到的要转换成十六进制的字符串
* @return
*/
public static String bin2hex(String bin) {
char[] digital = "0123456789ABCDEF".toCharArray();
StringBuffer sb = new StringBuffer("");
byte[] bs = bin.getBytes();
int bit;
for (int i = 0; i < bs.length; i++) {
bit = (bs[i] & 0x0f0) >> 4;
sb.append(digital[bit]);
bit = bs[i] & 0x0f;
sb.append(digital[bit]);
}
return sb.toString();
}

/**
* 十六进制转换字符串
*
* @param hex
* String 十六进制
* @return String 转换后的字符串
*/
public static String hex2bin(String hex) {
String digital = "0123456789ABCDEF";
char[] hex2char = hex.toCharArray();
byte[] bytes = new byte[hex.length() / 2];
int temp;
for (int i = 0; i < bytes.length; i++) {
temp = digital.indexOf(hex2char[2 * i]) * 16;
temp += digital.indexOf(hex2char[2 * i + 1]);
bytes[i] = (byte) (temp & 0xff);
}
//System.out.println("hex2bin:"+new String(bytes));
return new String(bytes);
}

public static void main(String[] args) {
String inputStr = "abcdefghijklmnopqrstuvwxyz_1234567890";
String key = "opensso";// 加密因子
String str = EncryptRC4(inputStr, key);
System.out.println(str);
System.out.println(DecryptRC4(str, key));
}
}

[xiaoqiulqs]

有没有人帮助下，急！

[一头头]

https://www.clarenceho.net/tech/rc4/rc4.zip

用这个试试看

String key = "12345";
RC4 rc4 = new RC4(key);



byte[] result = rc4.rc4(data);

[xiaoqiulqs]

这个MS不好用啊

[一头头]

我怎么用着好好的呀。。。。。

[xiaoqiulqs]

麻烦你能不能写个完事的DEMO调用程序

[xiaoqiulqs]

最好是经过16进制转换的，谢谢!

[一头头]

package net.clarenceho.crypto;

import java.util.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

/**
 * This class tests the RC4 implementation of net.clarenceho.crypto.RC4 against
 * the implementation from Cryptix.  To run this test, you will need to install
 * the Cryptix JCE library first.  For details of the Cryptix JCE library,
 * please visit http://www.cryptix.org/products/jce/index.html
 * <p>
 * @author  Clarence Ho
 */
public class Test {
    
    private static final Random rand = new Random();

    
    public Test() {
        
        try {
            Security.addProvider(new cryptix.jce.provider.CryptixCrypto());
        } catch (Exception e) {
            e.printStackTrace(System.err);
        }
    }
            

    /**
     * Executes 2 tests.  The first test is to compare the ciphertext output
     * from both net.clarenceho.crypto.RC4 and Cryptix.
     * <br>
     * The second test is to decrypt the ciphertext
     * using net.clarenceho.crypto.RC4 and compare it with
     * the original plaintext.
     */
    public boolean test(byte[] key, byte[] data) {
        try {
            // uses net.clarenceho.crypto.RC4
            RC4 ownRc4 = new RC4(key);
            byte[] result_own = ownRc4.rc4(data);

            // uses cryptix
            Cipher c = Cipher.getInstance("RC4", "CryptixCrypto");
            c.init(Cipher.ENCRYPT_MODE, new K("RC4", key));
            byte[] result_cryptix = c.doFinal(data);
            
            // compares two ciphertexts
            if (!Arrays.equals(result_own, result_cryptix)) {
                return false;
            }
        
            // uses net.clarenceho.crypto.RC4 to decrypt
            ownRc4 = new RC4(key);
            byte[] result_own2 = ownRc4.rc4(result_own);
            
            if (!Arrays.equals(result_own2, data)) {
                return false;
            }
            
            return true;
            
        } catch (Exception e) {
            System.err.println("");
            e.printStackTrace(System.err);
            return false;
        }
    }

    private static boolean genRandomTest() {
        
        int keylength = rand.nextInt(15) + 1;
        byte key[] = new byte[keylength];
        for (int i=0; i < keylength; i++) {
            key[i] = (byte)rand.nextInt(256);
        }
        
        int datalength = rand.nextInt(1500) + 1;
        byte data[] = new byte[datalength];
        for (int i=0; i < datalength; i++) {
            data[i] = (byte)rand.nextInt(256);
        }
        
        System.out.print("key length=" + keylength + ";\tdata length=" + datalength);
        Test test = new Test();
        if (!test.test(key, data)) {
            System.out.println("    \tFailed");
            System.out.println("Problem: key=[" + dumpArray(key) + "]; data=[" + dumpArray(data) + "]");
            return false;
        } else {
            System.out.println("    \tOK");
            return true;
        }
    }
        
    private void benchmark() {
        try {
            int keylength = 16;
            byte key[] = new byte[keylength];
            for (int i=0; i < keylength; i++) {
                key[i] = (byte)rand.nextInt(256);
            }
            
            int datalengthMB = 10;
            int datalength = 1024 * 1024 * datalengthMB;
            byte data[] = new byte[datalength];
            for (int i=0; i < datalength; i++) {
                data[i] = (byte)rand.nextInt(256);
            }
            
            long start = System.currentTimeMillis();
            RC4 rc4 = new RC4(key);
            rc4.rc4(data);
            long end = System.currentTimeMillis();
    
            System.err.println("net.clarenceho.crypto.RC4:");
            System.err.println("Time taken to encrypt/decrypt " + datalengthMB + " MB: " + (end - start) + "ms");
            System.err.println("Speed: " + ((double)1000.0 * datalengthMB / (end - start)) + " MB/s");
            System.err.println("");
    
            // uses cryptix
            start = System.currentTimeMillis();
            Cipher c = Cipher.getInstance("RC4", "CryptixCrypto");
            c.init(Cipher.ENCRYPT_MODE, new K("RC4", key));
            byte[] result_cryptix = c.doFinal(data);
            end = System.currentTimeMillis();
    
            System.err.println("Cryptix:");
            System.err.println("Time taken to encrypt/decrypt " + datalengthMB + " MB: " + (end - start) + "ms");
            System.err.println("Speed: " + ((double)1000.0 * datalengthMB / (end - start)) + " MB/s");
        
        } catch (Exception e) {
            e.printStackTrace(System.err);
        }

    }

    
    private static String dumpArray(byte[] buf) {
        
        StringBuffer sb = new StringBuffer();
        
        for (int i=0; i < buf.length; i++) {
            if (i > 0) {
                sb.append(" ");
            }
            
            sb.append(Integer.toString((buf[i] & 0xff) + 0x100, 16).substring(1).toUpperCase());
        }
        
        return sb.toString();
    }
    
    
    public static void main(String args[]) {
        
        System.out.println("Compare ciphertext output between this class and Crypix's implementation...");
        for (int i=0; i < 1000; i++) {
            if (!genRandomTest()) {
                return;
            }
        }
        
        System.out.println("");
        
        System.out.println("Benchmarking...");
        Test test = new Test();
        test.benchmark();
    }


    /**
     * This is a Key class from the Cryptix library.  The following
     * is the license statement from Cryptix source file:
     * <p>
     * <pre>
     * Copyright (C) 1995-2000 The Cryptix Foundation Limited.
     * All rights reserved.
     *
     * Use, modification, copying and distribution of this software is subject
     * the terms and conditions of the Cryptix General Licence. You should have
     * received a copy of the Cryptix General Licence along with this library;
     * if not, you can download a copy from http://www.cryptix.org/ .
     * </pre>
     */
    private class K 
    implements Key 
    {
        private final byte[] keyBytes;
        private final String alg;
        
        K(String alg, byte[] keyBytes) 
        {
            this.alg      = alg;
            this.keyBytes = keyBytes;
        }
        
        public String getAlgorithm() { return alg;  }
        public String getFormat()    { return "RAW"; }
        public byte[] getEncoded()   { return (byte[])keyBytes.clone(); }
    }
    
    
    
}

里面都有啊 哥哥。。。

[xiaoqiulqs]

cryptix.jce.provider.CryptixCrypto()这个东西不了解，运行不了
其实我只想要标准的RC4加解密算法，并且需要对加密数据进行16进制转换功能。

[xiaoqiulqs]

终于搞定了，真是笨我，闹了半天，原来是字符编码问题，不过还是谢谢你coldanimal

[不姓贾_请叫我甄先生]

恩，学习

[shuyu0]

这个帖子我的标记个= =

我遇到一个关于RC4的问题了，不解啊= =