国密SM4，javaScript加密 java解密

前段时间因工作需要，接触到了SM算法。国密即国家密码局认定的国产密码算法。主要有SM1，SM2，SM3，SM4。密钥长度和分组长度均为128位。

SM1 为对称加密。其加密强度与AES相当。该算法不公开，调用该算法时，需要通过加密芯片的接口进行调用。

SM2为非对称加密，基于ECC。该算法已公开。由于该算法基于ECC，故其签名速度与秘钥生成速度都快于RSA。ECC 256位（SM2采用的就是ECC 256位的一种）安全强度比RSA 2048位高，但运算速度快于RSA。

SM3 消息摘要。可以用MD5作为对比理解。该算法已公开。校验结果为256位。

SM4 无线局域网标准的分组数据算法。对称加密，密钥长度和分组长度均为128位。

 

SM4网上有许多java代码，但javaScript代码实现缺很少。以下代码是根据Java代码自己写的JavaScript版本：

java代码是在网上找到用的比较多的版本，直接修改。

由于js是弱类型，不支持long类型，所以在java中的long类型改写为int类型了，代码如下：

SM4Utils.java

package com.encode.sm4;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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

public class SM4Utils
{
    private String secretKey = "";
    private String iv = "";
    private boolean hexString = false; 
    
    public SM4Utils()
    {
    }
    
    public String encryptData_ECB(String plainText)
    {
        try 
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;
            
            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes("UTF-8"));
            String cipherText = new BASE64Encoder().encode(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0)
            {
                Pattern p = Pattern.compile("\\s*|\t|\r|\n");
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        } 
        catch (Exception e) 
        {
            e.printStackTrace();
            return null;
        }
    }
    
    public String decryptData_ECB(String cipherText)
    {
        try 
        {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;
            
            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_ecb(ctx, new BASE64Decoder().decodeBuffer(cipherText));
            return new String(decrypted, "UTF-8");
        } 
        catch (Exception e) 
        {
            e.printStackTrace();
            return null;
        }
    }
    
    public String encryptData_CBC(String plainText){  
         try{  
                SM4_Context ctx = new SM4_Context();  
                ctx.isPadding = true;  
                ctx.mode = SM4.SM4_ENCRYPT;  
                  
                byte[] keyBytes;  
                byte[] ivBytes;  
               
                keyBytes = secretKey.getBytes();  
                ivBytes = iv.getBytes();  
                  
                SM4 sm4 = new SM4();  
                sm4.sm4_setkey_enc(ctx, keyBytes);  
                byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainText.getBytes("UTF-8"));  
                String cipherText = new BASE64Encoder().encode(encrypted);  
                if (cipherText != null && cipherText.trim().length() > 0)  
                {  
                    Pattern p = Pattern.compile("\\s*|\t|\r|\n");  
                    Matcher m = p.matcher(cipherText);  
                    cipherText = m.replaceAll("");  
                }  
                return cipherText;  
            }   
            catch (Exception e)   
            {  
                e.printStackTrace();  
                return null;  
            }  
        }  
          
        public String decryptData_CBC(String cipherText)  
        {  
            try   
            {  
                SM4_Context ctx = new SM4_Context();  
                ctx.isPadding = true;  
                ctx.mode = SM4.SM4_DECRYPT;  
                  
                byte[] keyBytes;  
                byte[] ivBytes;  
                if (hexString)  
                {  
                    keyBytes = Util.hexStringToBytes(secretKey);  
                    ivBytes = Util.hexStringToBytes(iv);  
                }  
                else  
                {  
                    keyBytes = secretKey.getBytes();  
                    ivBytes = iv.getBytes();  
                }  
                  
                SM4 sm4 = new SM4();  
                sm4.sm4_setkey_dec(ctx, keyBytes);  
                byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, new BASE64Decoder().decodeBuffer(cipherText));  
                return new String(decrypted, "UTF-8");  
            }   
            catch (Exception e)  
            {  
                e.printStackTrace();
                return null;  
            }  
        }  
          
    
    public static void main(String[] args) throws IOException 
    {
        String plainText ="ssda撒打飞机了ii&$$^##)*&6223';.,[]";
        SM4Utils sm4 = new SM4Utils();
        sm4.secretKey = "11HDESaAhiHHugDz";
        plainText.getBytes("UTF-8");        
        System.out.println("ECB模式");
        String cipherText = sm4.encryptData_ECB(plainText);
        System.out.println("密文: " + cipherText);
        System.out.println("");
        
        plainText = sm4.decryptData_ECB(cipherText);
        System.out.println("明文: " + plainText);
        System.out.println("");
        
        System.out.println("CBC模式");  
        sm4.iv = "UISwD9fW6cFh9SNS";  
        cipherText = sm4.encryptData_CBC(plainText);  
        System.out.println("密文: " + cipherText);  
        System.out.println("");  
          
        plainText = sm4.decryptData_CBC(cipherText);  
        System.out.println("明文: " + plainText);
        //PI4ke7HMoUMD/LOSHWX5/g==
        
    }
}

SM4.java

package com.encode.sm4;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;



public class SM4 
{
    public static final int SM4_ENCRYPT = 1;
    
    public static final int SM4_DECRYPT = 0;

    private int GET_ULONG_BE(byte[] b, int i) 
    {
        int n = (int)(b[i] & 0xff) << 24 | (int)((b[i + 1] & 0xff) << 16) | (int)((b[i + 2] & 0xff) << 8) | (int)(b[i + 3] & 0xff) & 0xffffffff;
        return n;
    }

    private void PUT_ULONG_BE(int n, byte[] b, int i) 
    {
        b[i] = (byte)(int)(0xFF & n >> 24);
        b[i + 1] = (byte)(int)(0xFF & n >> 16);
        b[i + 2] = (byte)(int)(0xFF & n >> 8);
        b[i + 3] = (byte)(int)(0xFF & n);
    }

    private int SHL(int x, int n) 
    {
        return (x & 0xFFFFFFFF) << n;
    }
    
    private int ROTL(int x, int n) 
    {
        return SHL(x, n) | x >> (32 - n);
    }
    
    public static final byte[] SboxTable = { (byte) 0xd6, (byte) 0x90, (byte) 0xe9, (byte) 0xfe,
        (byte) 0xcc, (byte) 0xe1, 0x3d, (byte) 0xb7, 0x16, (byte) 0xb6,
        0x14, (byte) 0xc2, 0x28, (byte) 0xfb, 0x2c, 0x05, 0x2b, 0x67,
        (byte) 0x9a, 0x76, 0x2a, (byte) 0xbe, 0x04, (byte) 0xc3,
        (byte) 0xaa, 0x44, 0x13, 0x26, 0x49, (byte) 0x86, 0x06,
        (byte) 0x99, (byte) 0x9c, 0x42, 0x50, (byte) 0xf4, (byte) 0x91,
        (byte) 0xef, (byte) 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43,
        (byte) 0xed, (byte) 0xcf, (byte) 0xac, 0x62, (byte) 0xe4,
        (byte) 0xb3, 0x1c, (byte) 0xa9, (byte) 0xc9, 0x08, (byte) 0xe8,
        (byte) 0x95, (byte) 0x80, (byte) 0xdf, (byte) 0x94, (byte) 0xfa,
        0x75, (byte) 0x8f, 0x3f, (byte) 0xa6, 0x47, 0x07, (byte) 0xa7,
        (byte) 0xfc, (byte) 0xf3, 0x73, 0x17, (byte) 0xba, (byte) 0x83,
        0x59, 0x3c, 0x19, (byte) 0xe6, (byte) 0x85, 0x4f, (byte) 0xa8,
        0x68, 0x6b, (byte) 0x81, (byte) 0xb2, 0x71, 0x64, (byte) 0xda,
        (byte) 0x8b, (byte) 0xf8, (byte) 0xeb, 0x0f, 0x4b, 0x70, 0x56,
        (byte) 0x9d, 0x35, 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, (byte) 0xd1,
        (byte) 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, (byte) 0x87,
        (byte) 0xd4, 0x00, 0x46, 0x57, (byte) 0x9f, (byte) 0xd3, 0x27,
        0x52, 0x4c, 0x36, 0x02, (byte) 0xe7, (byte) 0xa0, (byte) 0xc4,
        (byte) 0xc8, (byte) 0x9e, (byte) 0xea, (byte) 0xbf, (byte) 0x8a,
        (byte) 0xd2, 0x40, (byte) 0xc7, 0x38, (byte) 0xb5, (byte) 0xa3,
        (byte) 0xf7, (byte) 0xf2, (byte) 0xce, (byte) 0xf9, 0x61, 0x15,
        (byte) 0xa1, (byte) 0xe0, (byte) 0xae, 0x5d, (byte) 0xa4,
        (byte) 0x9b, 0x34, 0x1a, 0x55, (byte) 0xad, (byte) 0x93, 0x32,
        0x30, (byte) 0xf5, (byte) 0x8c, (byte) 0xb1, (byte) 0xe3, 0x1d,
        (byte) 0xf6, (byte) 0xe2, 0x2e, (byte) 0x82, 0x66, (byte) 0xca,
        0x60, (byte) 0xc0, 0x29, 0x23, (byte) 0xab, 0x0d, 0x53, 0x4e, 0x6f,
        (byte) 0xd5, (byte) 0xdb, 0x37, 0x45, (byte) 0xde, (byte) 0xfd,
        (byte) 0x8e, 0x2f, 0x03, (byte) 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b,
        0x51, (byte) 0x8d, 0x1b, (byte) 0xaf, (byte) 0x92, (byte) 0xbb,
        (byte) 0xdd, (byte) 0xbc, 0x7f, 0x11, (byte) 0xd9, 0x5c, 0x41,
        0x1f, 0x10, 0x5a, (byte) 0xd8, 0x0a, (byte) 0xc1, 0x31,
        (byte) 0x88, (byte) 0xa5, (byte) 0xcd, 0x7b, (byte) 0xbd, 0x2d,
        0x74, (byte) 0xd0, 0x12, (byte) 0xb8, (byte) 0xe5, (byte) 0xb4,
        (byte) 0xb0, (byte) 0x89, 0x69, (byte) 0x97, 0x4a, 0x0c,
        (byte) 0x96, 0x77, 0x7e, 0x65, (byte) 0xb9, (byte) 0xf1, 0x09,
        (byte) 0xc5, 0x6e, (byte) 0xc6, (byte) 0x84, 0x18, (byte) 0xf0,
        0x7d, (byte) 0xec, 0x3a, (byte) 0xdc, 0x4d, 0x20, 0x79,
        (byte) 0xee, 0x5f, 0x3e, (byte) 0xd7, (byte) 0xcb, 0x39, 0x48 };
    
    public static final int[] FK = { 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc };
    
    public static final int[] CK = { 0x00070e15,0x1c232a31,0x383f464d,0x545b6269,
        0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9,
        0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249,
        0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9,
        0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229,
        0x30373e45,0x4c535a61,0x686f767d,0x848b9299,
        0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209,
        0x10171e25,0x2c333a41,0x484f565d,0x646b7279 };

    private byte sm4Sbox(byte inch)
    {
        int i = inch & 0xFF;
        byte retVal = SboxTable[i];
        return retVal;
    }

    private int sm4Lt(int ka) 
    {
        int bb = 0;
        int c = 0;
        byte[] a = new byte[4];
        byte[] b = new byte[4];
        PUT_ULONG_BE(ka, a, 0);
        b[0] = sm4Sbox(a[0]);
        b[1] = sm4Sbox(a[1]);
        b[2] = sm4Sbox(a[2]);
        b[3] = sm4Sbox(a[3]);
        bb = GET_ULONG_BE(b, 0);
        c = bb ^ ROTL(bb, 2) ^ ROTL(bb, 10) ^ ROTL(bb, 18) ^ ROTL(bb, 24);
        return c;
    }

    private int sm4F(int x0, int x1, int x2, int x3, int rk)
    {
        return x0 ^ sm4Lt(x1 ^ x2 ^ x3 ^ rk);
    }

    private int sm4CalciRK(int ka) 
    {
        int bb = 0;
        int rk = 0;
        byte[] a = new byte[4];
        byte[] b = new byte[4];
        PUT_ULONG_BE(ka, a, 0);
        b[0] = sm4Sbox(a[0]);
        b[1] = sm4Sbox(a[1]);
        b[2] = sm4Sbox(a[2]);
        b[3] = sm4Sbox(a[3]);
        bb = GET_ULONG_BE(b, 0);
        rk = bb ^ ROTL(bb, 13) ^ ROTL(bb, 23);
        return rk;
    }

    private void sm4_setkey(int[] SK, byte[] key) 
    {
        int[] MK = new int[4];
        int[] k = new int[36];
        int i = 0;
        MK[0] = GET_ULONG_BE(key, 0);
        MK[1] = GET_ULONG_BE(key, 4);
        MK[2] = GET_ULONG_BE(key, 8);
        MK[3] = GET_ULONG_BE(key, 12);
        k[0] = MK[0] ^ (int) FK[0];
        k[1] = MK[1] ^ (int) FK[1];
        k[2] = MK[2] ^ (int) FK[2];
        k[3] = MK[3] ^ (int) FK[3];
        for (; i < 32; i++) 
        {
            k[(i + 4)] = (k[i] ^ sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ (int) CK[i]));
            SK[i] = k[(i + 4)];
        }
    }

    private void sm4_one_round(int[] sk, byte[] input, byte[] output) 
    {
        int i = 0;
        int[] ulbuf = new int[36];
        ulbuf[0] = GET_ULONG_BE(input, 0);
        ulbuf[1] = GET_ULONG_BE(input, 4);
        ulbuf[2] = GET_ULONG_BE(input, 8);
        ulbuf[3] = GET_ULONG_BE(input, 12);
        while (i < 32)
        {
            ulbuf[(i + 4)] = sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
            i++;
        }
        PUT_ULONG_BE(ulbuf[35], output, 0);
        PUT_ULONG_BE(ulbuf[34], output, 4);
        PUT_ULONG_BE(ulbuf[33], output, 8);
        PUT_ULONG_BE(ulbuf[32], output, 12);
    }

    private byte[] padding(byte[] input, int mode)
    {
        if (input == null) 
        {
            return null;
        }
        
        byte[] ret = (byte[]) null;
        if (mode == SM4_ENCRYPT) 
        {
            int p = 16 - input.length % 16;
            ret = new byte[input.length + p];
            System.arraycopy(input, 0, ret, 0, input.length);
            for (int i = 0; i < p; i++) 
            {
                ret[input.length + i] = (byte) p;
            }
        } 
        else 
        {
            int p = input[input.length - 1];
            ret = new byte[input.length - p];
            System.arraycopy(input, 0, ret, 0, input.length - p);
        }
        return ret;
    }

    public void sm4_setkey_enc(SM4_Context ctx, byte[] key) throws Exception
    {
        if (ctx == null) 
        {
            throw new Exception("ctx is null!");
        }
        
        if (key == null || key.length != 16) 
        {
            throw new Exception("key error!");
        }
        
        ctx.mode = SM4_ENCRYPT;
        sm4_setkey(ctx.sk, key);
    }

    
    public byte[] sm4_crypt_ecb(SM4_Context ctx, byte[] input) throws Exception 
    {
        if (input == null) 
        {
            throw new Exception("input is null!");
        }
    
        if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT)) 
        {
            input = padding(input, SM4_ENCRYPT);
        }
        
        int length = input.length;
        ByteArrayInputStream bins = new ByteArrayInputStream(input);
        ByteArrayOutputStream bous = new ByteArrayOutputStream();
        for(; length > 0; length -= 16)
        {
            byte[] in = new byte[16];
            byte[] out = new byte[16];
            bins.read(in);
            sm4_one_round(ctx.sk, in, out);
            bous.write(out);
        }
        
        byte[] output = bous.toByteArray();
        if (ctx.isPadding && ctx.mode == SM4_DECRYPT) 
        {
            output = padding(output, SM4_DECRYPT);
        }
        bins.close();
        bous.close();
        return output;
    }
    
    
    public void sm4_setkey_dec(SM4_Context ctx, byte[] key) throws Exception
    {
        if (ctx == null) 
        {
            throw new Exception("ctx is null!");
        }
        
        if (key == null || key.length != 16) 
        {
            throw new Exception("key error!");
        }
        
        int i = 0;
        ctx.mode = SM4_DECRYPT;
        sm4_setkey(ctx.sk, key);
        for (i = 0; i < 16; i++) 
        {
            SWAP(ctx.sk, i);
        }
    }
    
    
    
    private void SWAP(int[] sk, int i)
    {
        int t = sk[i];
        sk[i] = sk[(31 - i)];
        sk[(31 - i)] = t;
    }
    
    
    
    
     public byte[] sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input) throws Exception  
        {  
            if (iv == null || iv.length != 16)  
            {  
                throw new Exception("iv error!");  
            }  
              
            if (input == null)   
            {  
                throw new Exception("input is null!");  
            }  
              
            if (ctx.isPadding && ctx.mode == SM4_ENCRYPT)   
            {  
                input = padding(input, SM4_ENCRYPT);  
            }  
              
            int i = 0;  
            int length = input.length;  
            ByteArrayInputStream bins = new ByteArrayInputStream(input);  
            ByteArrayOutputStream bous = new ByteArrayOutputStream();  
            if (ctx.mode == SM4_ENCRYPT)   
            {  
                for(; length > 0; length -= 16)  
                {  
                    byte[] in = new byte[16];  
                    byte[] out = new byte[16];  
                    byte[] out1 = new byte[16];  
                      
                    bins.read(in);  
                    for (i = 0; i < 16; i++)   
                    {  
                        out[i] = ((byte) (in[i] ^ iv[i]));  
                    }  
                    sm4_one_round(ctx.sk, out, out1);  
                    System.arraycopy(out1, 0, iv, 0, 16);  
                    bous.write(out1);  
                }  
            }   
            else   
            {  
                byte[] temp = new byte[16];  
                for(; length > 0; length -= 16)  
                {  
                    byte[] in = new byte[16];  
                    byte[] out = new byte[16];  
                    byte[] out1 = new byte[16];  
                      
                    bins.read(in);  
                    System.arraycopy(in, 0, temp, 0, 16);  
                    sm4_one_round(ctx.sk, in, out);  
                    for (i = 0; i < 16; i++)   
                    {  
                        out1[i] = ((byte) (out[i] ^ iv[i]));  
                    }  
                    System.arraycopy(temp, 0, iv, 0, 16);  
                    bous.write(out1);  
                }  
            }  
              
            byte[] output = bous.toByteArray();  
            if (ctx.isPadding && ctx.mode == SM4_DECRYPT)   
            {  
                output = padding(output, SM4_DECRYPT);  
            }  
            bins.close();  
            bous.close();  
            return output;  
        }  


    
}

SM4_Context.java

package com.encode.sm4;

public class SM4_Context
{
    public int mode;
    
    public int[] sk;
    
    public boolean isPadding;

    public SM4_Context() 
    {
        this.mode = 1;
        this.isPadding = true;
        this.sk = new int[32];
    }
}

util.java

package com.encode.sm4;

import java.math.BigInteger;  

public class Util   
{  
    /** 
     * 整形转换成网络传输的字节流（字节数组）型数据 
     *  
     * @param num 一个整型数据 
     * @return 4个字节的自己数组 
     */  
    public static byte[] intToBytes(int num)  
    {  
        byte[] bytes = new byte[4];  
        bytes[0] = (byte) (0xff & (num >> 0));  
        bytes[1] = (byte) (0xff & (num >> 8));  
        bytes[2] = (byte) (0xff & (num >> 16));  
        bytes[3] = (byte) (0xff & (num >> 24));  
        return bytes;  
    }  
  
    /** 
     * 四个字节的字节数据转换成一个整形数据 
     *  
     * @param bytes 4个字节的字节数组 
     * @return 一个整型数据 
     */  
    public static int byteToInt(byte[] bytes)   
    {  
        int num = 0;  
        int temp;  
        temp = (0x000000ff & (bytes[0])) << 0;  
        num = num | temp;  
        temp = (0x000000ff & (bytes[1])) << 8;  
        num = num | temp;  
        temp = (0x000000ff & (bytes[2])) << 16;  
        num = num | temp;  
        temp = (0x000000ff & (bytes[3])) << 24;  
        num = num | temp;  
        return num;  
    }  
  
    /** 
     * 长整形转换成网络传输的字节流（字节数组）型数据 
     *  
     * @param num 一个长整型数据 
     * @return 4个字节的自己数组 
     */  
    public static byte[] longToBytes(long num)   
    {  
        byte[] bytes = new byte[8];  
        for (int i = 0; i < 8; i++)   
        {  
            bytes[i] = (byte) (0xff & (num >> (i * 8)));  
        }  
  
        return bytes;  
    }  
  
    /** 
     * 大数字转换字节流（字节数组）型数据 
     *  
     * @param n 
     * @return 
     */  
    public static byte[] byteConvert32Bytes(BigInteger n)   
    {  
        byte tmpd[] = (byte[])null;  
        if(n == null)  
        {  
            return null;  
        }  
          
        if(n.toByteArray().length == 33)  
        {  
            tmpd = new byte[32];  
            System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);  
        }   
        else if(n.toByteArray().length == 32)  
        {  
            tmpd = n.toByteArray();  
        }   
        else  
        {  
            tmpd = new byte[32];  
            for(int i = 0; i < 32 - n.toByteArray().length; i++)  
            {  
                tmpd[i] = 0;  
            }  
            System.arraycopy(n.toByteArray(), 0, tmpd, 32 - n.toByteArray().length, n.toByteArray().length);  
        }  
        return tmpd;  
    }  
      
    /** 
     * 换字节流（字节数组）型数据转大数字 
     *  
     * @param b 
     * @return 
     */  
    public static BigInteger byteConvertInteger(byte[] b)  
    {  
        if (b[0] < 0)  
        {  
            byte[] temp = new byte[b.length + 1];  
            temp[0] = 0;  
            System.arraycopy(b, 0, temp, 1, b.length);  
            return new BigInteger(temp);  
        }  
        return new BigInteger(b);  
    }  
      
    /** 
     * 根据字节数组获得值(十六进制数字) 
     *  
     * @param bytes 
     * @return 
     */  
    public static String getHexString(byte[] bytes)   
    {  
        return getHexString(bytes, true);  
    }  
      
    /** 
     * 根据字节数组获得值(十六进制数字) 
     *  
     * @param bytes 
     * @param upperCase 
     * @return 
     */  
    public static String getHexString(byte[] bytes, boolean upperCase)   
    {  
        String ret = "";  
        for (int i = 0; i < bytes.length; i++)   
        {  
            ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1);  
        }  
        return upperCase ? ret.toUpperCase() : ret;  
    }  
      
    /** 
     * 打印十六进制字符串 
     *  
     * @param bytes 
     */  
    public static void printHexString(byte[] bytes)   
    {  
        for (int i = 0; i < bytes.length; i++)   
        {  
            String hex = Integer.toHexString(bytes[i] & 0xFF);  
            if (hex.length() == 1)   
            {  
                hex = '0' + hex;  
            }  
            System.out.print("0x" + hex.toUpperCase() + ",");  
        }  
        System.out.println("");  
    }  
      
    /** 
     * Convert hex string to byte[] 
     *  
     * @param hexString 
     *            the hex string 
     * @return byte[] 
     */  
    public static byte[] hexStringToBytes(String hexString)   
    {  
        if (hexString == null || hexString.equals(""))   
        {  
            return null;  
        }  
          
        hexString = hexString.toUpperCase();  
        int length = hexString.length() / 2;  
        char[] hexChars = hexString.toCharArray();  
        byte[] d = new byte[length];  
        for (int i = 0; i < length; i++)   
        {  
            int pos = i * 2;  
            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));  
        }  
        return d;  
    }  
      
    /** 
     * Convert char to byte 
     *  
     * @param c 
     *            char 
     * @return byte 
     */  
    public static byte charToByte(char c)   
    {  
        return (byte) "0123456789ABCDEF".indexOf(c);  
    }  
      
    /** 
     * 用于建立十六进制字符的输出的小写字符数组 
     */  
    private static final char[] DIGITS_LOWER = {'0', '1', '2', '3', '4', '5',  
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};  
   
    /** 
     * 用于建立十六进制字符的输出的大写字符数组 
     */  
    private static final char[] DIGITS_UPPER = {'0', '1', '2', '3', '4', '5',  
            '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};  
   
    /** 
     * 将字节数组转换为十六进制字符数组 
     * 
     * @param data byte[] 
     * @return 十六进制char[] 
     */  
    public static char[] encodeHex(byte[] data) {  
        return encodeHex(data, true);  
    }  
   
    /** 
     * 将字节数组转换为十六进制字符数组 
     * 
     * @param data        byte[] 
     * @param toLowerCase true 传换成小写格式 ， false 传换成大写格式 
     * @return 十六进制char[] 
     */  
    public static char[] encodeHex(byte[] data, boolean toLowerCase) {  
        return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);  
    }  
   
    /** 
     * 将字节数组转换为十六进制字符数组 
     * 
     * @param data     byte[] 
     * @param toDigits 用于控制输出的char[] 
     * @return 十六进制char[] 
     */  
    protected static char[] encodeHex(byte[] data, char[] toDigits) {  
        int l = data.length;  
        char[] out = new char[l << 1];  
        // two characters form the hex value.  
        for (int i = 0, j = 0; i < l; i++) {  
            out[j++] = toDigits[(0xF0 & data[i]) >>> 4];  
            out[j++] = toDigits[0x0F & data[i]];  
        }  
        return out;  
    }  
   
    /** 
     * 将字节数组转换为十六进制字符串 
     * 
     * @param data byte[] 
     * @return 十六进制String 
     */  
    public static String encodeHexString(byte[] data) {  
        return encodeHexString(data, true);  
    }  
   
    /** 
     * 将字节数组转换为十六进制字符串 
     * 
     * @param data        byte[] 
     * @param toLowerCase true 传换成小写格式 ， false 传换成大写格式 
     * @return 十六进制String 
     */  
    public static String encodeHexString(byte[] data, boolean toLowerCase) {  
        return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);  
    }  
   
    /** 
     * 将字节数组转换为十六进制字符串 
     * 
     * @param data     byte[] 
     * @param toDigits 用于控制输出的char[] 
     * @return 十六进制String 
     */  
    protected static String encodeHexString(byte[] data, char[] toDigits) {  
        return new String(encodeHex(data, toDigits));  
    }  
   
    /** 
     * 将十六进制字符数组转换为字节数组 
     * 
     * @param data 十六进制char[] 
     * @return byte[] 
     * @throws RuntimeException 如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常 
     */  
    public static byte[] decodeHex(char[] data) {  
        int len = data.length;  
   
        if ((len & 0x01) != 0) {  
            throw new RuntimeException("Odd number of characters.");  
        }  
   
        byte[] out = new byte[len >> 1];  
   
        // two characters form the hex value.  
        for (int i = 0, j = 0; j < len; i++) {  
            int f = toDigit(data[j], j) << 4;  
            j++;  
            f = f | toDigit(data[j], j);  
            j++;  
            out[i] = (byte) (f & 0xFF);  
        }  
   
        return out;  
    }  
   
    /** 
     * 将十六进制字符转换成一个整数 
     * 
     * @param ch    十六进制char 
     * @param index 十六进制字符在字符数组中的位置 
     * @return 一个整数 
     * @throws RuntimeException 当ch不是一个合法的十六进制字符时，抛出运行时异常 
     */  
    protected static int toDigit(char ch, int index) {  
        int digit = Character.digit(ch, 16);  
        if (digit == -1) {  
            throw new RuntimeException("Illegal hexadecimal character " + ch  
                    + " at index " + index);  
        }  
        return digit;  
    }  
   
    /** 
     * 数字字符串转ASCII码字符串 
     *  
     * @param String 
     *            字符串 
     * @return ASCII字符串 
     */  
    public static String StringToAsciiString(String content) {  
        String result = "";  
        int max = content.length();  
        for (int i = 0; i < max; i++) {  
            char c = content.charAt(i);  
            String b = Integer.toHexString(c);  
            result = result + b;  
        }  
        return result;  
    }  
      
    /** 
     * 十六进制转字符串 
     *  
     * @param hexString 
     *            十六进制字符串 
     * @param encodeType 
     *            编码类型4：Unicode，2：普通编码 
     * @return 字符串 
     */  
    public static String hexStringToString(String hexString, int encodeType) {  
        String result = "";  
        int max = hexString.length() / encodeType;  
        for (int i = 0; i < max; i++) {  
            char c = (char) hexStringToAlgorism(hexString  
                    .substring(i * encodeType, (i + 1) * encodeType));  
            result += c;  
        }  
        return result;  
    }  
      
    /** 
     * 十六进制字符串装十进制 
     *  
     * @param hex 
     *            十六进制字符串 
     * @return 十进制数值 
     */  
    public static int hexStringToAlgorism(String hex) {  
        hex = hex.toUpperCase();  
        int max = hex.length();  
        int result = 0;  
        for (int i = max; i > 0; i--) {  
            char c = hex.charAt(i - 1);  
            int algorism = 0;  
            if (c >= '0' && c <= '9') {  
                algorism = c - '0';  
            } else {  
                algorism = c - 55;  
            }  
            result += Math.pow(16, max - i) * algorism;  
        }  
        return result;  
    }  
      
    /** 
     * 十六转二进制 
     *  
     * @param hex 
     *            十六进制字符串 
     * @return 二进制字符串 
     */  
    public static String hexStringToBinary(String hex) {  
        hex = hex.toUpperCase();  
        String result = "";  
        int max = hex.length();  
        for (int i = 0; i < max; i++) {  
            char c = hex.charAt(i);  
            switch (c) {  
            case '0':  
                result += "0000";  
                break;  
            case '1':  
                result += "0001";  
                break;  
            case '2':  
                result += "0010";  
                break;  
            case '3':  
                result += "0011";  
                break;  
            case '4':  
                result += "0100";  
                break;  
            case '5':  
                result += "0101";  
                break;  
            case '6':  
                result += "0110";  
                break;  
            case '7':  
                result += "0111";  
                break;  
            case '8':  
                result += "1000";  
                break;  
            case '9':  
                result += "1001";  
                break;  
            case 'A':  
                result += "1010";  
                break;  
            case 'B':  
                result += "1011";  
                break;  
            case 'C':  
                result += "1100";  
                break;  
            case 'D':  
                result += "1101";  
                break;  
            case 'E':  
                result += "1110";  
                break;  
            case 'F':  
                result += "1111";  
                break;  
            }  
        }  
        return result;  
    }  
      
    /** 
     * ASCII码字符串转数字字符串 
     *  
     * @param String 
     *            ASCII字符串 
     * @return 字符串 
     */  
    public static String AsciiStringToString(String content) {  
        String result = "";  
        int length = content.length() / 2;  
        for (int i = 0; i < length; i++) {  
            String c = content.substring(i * 2, i * 2 + 2);  
            int a = hexStringToAlgorism(c);  
            char b = (char) a;  
            String d = String.valueOf(b);  
            result += d;  
        }  
        return result;  
    }  
      
    /** 
     * 将十进制转换为指定长度的十六进制字符串 
     *  
     * @param algorism 
     *            int 十进制数字 
     * @param maxLength 
     *            int 转换后的十六进制字符串长度 
     * @return String 转换后的十六进制字符串 
     */  
    public static String algorismToHexString(int algorism, int maxLength) {  
        String result = "";  
        result = Integer.toHexString(algorism);  
  
        if (result.length() % 2 == 1) {  
            result = "0" + result;  
        }  
        return patchHexString(result.toUpperCase(), maxLength);  
    }  
      
    /** 
     * 字节数组转为普通字符串（ASCII对应的字符） 
     *  
     * @param bytearray 
     *            byte[] 
     * @return String 
     */  
    public static String byteToString(byte[] bytearray) {  
        String result = "";  
        char temp;  
  
        int length = bytearray.length;  
        for (int i = 0; i < length; i++) {  
            temp = (char) bytearray[i];  
            result += temp;  
        }  
        return result;  
    }  
      
    /** 
     * 二进制字符串转十进制 
     *  
     * @param binary 
     *            二进制字符串 
     * @return 十进制数值 
     */  
    public static int binaryToAlgorism(String binary) {  
        int max = binary.length();  
        int result = 0;  
        for (int i = max; i > 0; i--) {  
            char c = binary.charAt(i - 1);  
            int algorism = c - '0';  
            result += Math.pow(2, max - i) * algorism;  
        }  
        return result;  
    }  
  
    /** 
     * 十进制转换为十六进制字符串 
     *  
     * @param algorism 
     *            int 十进制的数字 
     * @return String 对应的十六进制字符串 
     */  
    public static String algorismToHEXString(int algorism) {  
        String result = "";  
        result = Integer.toHexString(algorism);  
  
        if (result.length() % 2 == 1) {  
            result = "0" + result;  
  
        }  
        result = result.toUpperCase();  
  
        return result;  
    }  
      
    /** 
     * HEX字符串前补0，主要用于长度位数不足。 
     *  
     * @param str 
     *            String 需要补充长度的十六进制字符串 
     * @param maxLength 
     *            int 补充后十六进制字符串的长度 
     * @return 补充结果 
     */  
    static public String patchHexString(String str, int maxLength) {  
        String temp = "";  
        for (int i = 0; i < maxLength - str.length(); i++) {  
            temp = "0" + temp;  
        }  
        str = (temp + str).substring(0, maxLength);  
        return str;  
    }  
      
    /** 
     * 将一个字符串转换为int 
     *  
     * @param s 
     *            String 要转换的字符串 
     * @param defaultInt 
     *            int 如果出现异常,默认返回的数字 
     * @param radix 
     *            int 要转换的字符串是什么进制的,如16 8 10. 
     * @return int 转换后的数字 
     */  
    public static int parseToInt(String s, int defaultInt, int radix) {  
        int i = 0;  
        try {  
            i = Integer.parseInt(s, radix);  
        } catch (NumberFormatException ex) {  
            i = defaultInt;  
        }  
        return i;  
    }  
      
    /** 
     * 将一个十进制形式的数字字符串转换为int 
     *  
     * @param s 
     *            String 要转换的字符串 
     * @param defaultInt 
     *            int 如果出现异常,默认返回的数字 
     * @return int 转换后的数字 
     */  
    public static int parseToInt(String s, int defaultInt) {  
        int i = 0;  
        try {  
            i = Integer.parseInt(s);  
        } catch (NumberFormatException ex) {  
            i = defaultInt;  
        }  
        return i;  
    }  
      
    /** 
     * 十六进制串转化为byte数组 
     *  
     * @return the array of byte 
     */  
    public static byte[] hexToByte(String hex)  
            throws IllegalArgumentException {  
        if (hex.length() % 2 != 0) {  
            throw new IllegalArgumentException();  
        }  
        char[] arr = hex.toCharArray();  
        byte[] b = new byte[hex.length() / 2];  
        for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {  
            String swap = "" + arr[i++] + arr[i];  
            int byteint = Integer.parseInt(swap, 16) & 0xFF;  
            b[j] = new Integer(byteint).byteValue();  
        }  
        return b;  
    }  
      
    /** 
     * 字节数组转换为十六进制字符串 
     *  
     * @param b 
     *            byte[] 需要转换的字节数组 
     * @return String 十六进制字符串 
     */  
    public static String byteToHex(byte b[]) {  
        if (b == null) {  
            throw new IllegalArgumentException(  
                    "Argument b ( byte array ) is null! ");  
        }  
        String hs = "";  
        String stmp = "";  
        for (int n = 0; n < b.length; n++) {  
            stmp = Integer.toHexString(b[n] & 0xff);  
            if (stmp.length() == 1) {  
                hs = hs + "0" + stmp;  
            } else {  
                hs = hs + stmp;  
            }  
        }  
        return hs.toUpperCase();  
    }  
      
    public static byte[] subByte(byte[] input, int startIndex, int length) {  
        byte[] bt = new byte[length];  
        for (int i = 0; i < length; i++) {  
            bt[i] = input[i + startIndex];  
        }  
        return bt;  
    }  
}