package com.jgqz.jgutil;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class MD5 {  
    /* ������ЩS11-S44ʵ������һ��4*4�ľ�����ԭʼ��Cʵ��������#define ʵ�ֵģ� 
    ���������ʵ�ֳ�Ϊstatic final�Ǳ�ʾ��ֻ����������ͬһ����̿ռ��ڵĶ�� 
    Instance�乲��*/  
    static final int S11 = 7;  
    static final int S12 = 12;  
    static final int S13 = 17;  
    static final int S14 = 22;  
  
    static final int S21 = 5;  
    static final int S22 = 9;  
    static final int S23 = 14;  
    static final int S24 = 20;  
  
    static final int S31 = 4;  
    static final int S32 = 11;  
    static final int S33 = 16;  
    static final int S34 = 23;  
  
    static final int S41 = 6;  
    static final int S42 = 10;  
    static final int S43 = 15;  
    static final int S44 = 21;  
  
    static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,  
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };  
    /* ����������Ա��MD5���������õ���3��������ݣ���ԭʼ��Cʵ���� 
    �����嵽MD5_CTX�ṹ�� 
 
    */  
    private long[] state = new long[4];  // state (ABCD)  
    private long[] count = new long[2];  // number of bits, modulo 2^64 (lsb first)  
    private byte[] buffer = new byte[64]; // input buffer  
  
    /* digestHexStr��MD5��Ψһһ��������Ա��������һ�μ������ 
    �� 16����ASCII��ʾ. 
    */  
    public String digestHexStr;  
  
    /* digest,������һ�μ������2�����ڲ���ʾ����ʾ128bit��MD5ֵ. 
    */  
    private byte[] digest = new byte[16];  
  
    /* 
    ��MD5����Ҫ�Ĺ�����������ڲ���������Ҫ����MD5�任���ַ� 
    ���ص��Ǳ任��Ľ���������Ǵӹ�����ԱdigestHexStrȡ�õģ� 
    */  
    public String md5(String inbuf) {  
        md5Init();  
        md5Update(inbuf.getBytes(), inbuf.length());  
        md5Final();  
        digestHexStr = "";  
        for (int i = 0; i < 16; i++) {  
            digestHexStr += byteHEX(digest[i]);  
        }  
        //return digestHexStr.substring(8,24);   //16λmd5  
        return digestHexStr;                    //32λmd5  
    }  
  
    public MD5() {  
        md5Init();  
  
        return;  
    }  
    /* md5Init��һ����ʼ�������ʼ�����ı�����װ���׼�Ļ��� */  
    private void md5Init() {  
        count[0] = 0L;  
        count[1] = 0L;  
  
  
        state[0] = 0x67452301L;  
        state[1] = 0xefcdab89L;  
        state[2] = 0x98badcfeL;  
        state[3] = 0x10325476L;  
  
        return;  
    }  
    /* F, G, H ,I ��4�����MD5���� */  
  
    private long F(long x, long y, long z) {  
        return (x & y) | ((~x) & z);  
  
    }  
    private long G(long x, long y, long z) {  
        return (x & z) | (y & (~z));  
  
    }  
    private long H(long x, long y, long z) {  
        return x ^ y ^ z;  
    }  
  
    private long I(long x, long y, long z) {  
        return y ^ (x | (~z));  
    }  
  
    /* 
    FF,GG,HH��II������F,G,H,I���н�һ���任 
    FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 
    Rotation is separate from addition to prevent recomputation. 
    */  
  
    private long FF(long a, long b, long c, long d, long x, long s, long ac) {  
        a += F (b, c, d) + x + ac;  
        a = ((int) a << s) | ((int) a >>> (32 - s));  
        a += b;  
        return a;  
    }  
  
    private long GG(long a, long b, long c, long d, long x, long s, long ac) {  
        a += G (b, c, d) + x + ac;  
        a = ((int) a << s) | ((int) a >>> (32 - s));  
        a += b;  
        return a;  
    }  
    private long HH(long a, long b, long c, long d, long x, long s, long ac) {  
        a += H (b, c, d) + x + ac;  
        a = ((int) a << s) | ((int) a >>> (32 - s));  
        a += b;  
        return a;  
    }  
    private long II(long a, long b, long c, long d, long x, long s, long ac) {  
        a += I (b, c, d) + x + ac;  
        a = ((int) a << s) | ((int) a >>> (32 - s));  
        a += b;  
        return a;  
    }  
    /* 
    md5Update��MD5���������̣�inbuf��Ҫ�任���ֽڴ���inputlen�ǳ��ȣ���� 
    ������md5���ã�����֮ǰ��Ҫ����md5init����˰�����Ƴ�private�� 
    */  
    private void md5Update(byte[] inbuf, int inputLen) {  
  
        int i, index, partLen;  
        byte[] block = new byte[64];  
        index = (int)(count[0] >>> 3) & 0x3F;  
        // /* Update number of bits */  
        if ((count[0] += (inputLen << 3)) < (inputLen << 3))  
            count[1]++;  
        count[1] += (inputLen >>> 29);  
  
        partLen = 64 - index;  
        // Transform as many times as possible.  
        if (inputLen >= partLen) {  
            md5Memcpy(buffer, inbuf, index, 0, partLen);  
            md5Transform(buffer);  
            for (i = partLen; i + 63 < inputLen; i += 64) {  
                md5Memcpy(block, inbuf, 0, i, 64);  
                md5Transform (block);  
            }  
            index = 0;  
        }  
        else  
            i = 0;  
        ///* Buffer remaining input */  
        md5Memcpy(buffer, inbuf, index, i, inputLen - i);  
  
    }  
  
    /* 
    md5Final�������д������ 
    */  
    private void md5Final () {  
        byte[] bits = new byte[8];  
        int index, padLen;  
        ///* Save number of bits */  
        Encode (bits, count, 8);  
        ///* Pad out to 56 mod 64.  
        index = (int)(count[0] >>> 3) & 0x3f;  
        padLen = (index < 56) ? (56 - index) : (120 - index);  
        md5Update (PADDING, padLen);  
        ///* Append length (before padding) */  
        md5Update(bits, 8);  
        ///* Store state in digest */  
        Encode (digest, state, 16);  
    }  
  
    /* md5Memcpy��һ���ڲ�ʹ�õ�byte����Ŀ鿽�������input��inpos��ʼ��len���ȵ� 
    �ֽڿ�����output��outposλ�ÿ�ʼ 
    */  
  
    private void md5Memcpy (byte[] output, byte[] input, int outpos, int inpos, int len) {  
        int i;  
        for (i = 0; i < len; i++)  
            output[outpos + i] = input[inpos + i];  
    }  
  
    /* 
    md5Transform��MD5���ı任������md5Update���ã�block�Ƿֿ��ԭʼ�ֽ� 
    */  
    private void md5Transform (byte block[]) {  
        long a = state[0], b = state[1], c = state[2], d = state[3];  
        long[] x = new long[16];  
        Decode (x, block, 64);  
  
        /* Round 1 */  
        a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */  
        d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */  
        c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */  
        b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */  
        a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */  
        d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */  
        c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */  
        b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */  
        a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */  
        d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */  
        c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */  
        b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */  
        a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */  
        d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */  
        c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */  
        b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */  
        /* Round 2 */  
        a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */  
        d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */  
        c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */  
        b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */  
        a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */  
        d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */  
        c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */  
        b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */  
        a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */  
        d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */  
        c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */  
        b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */  
        a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */  
        d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */  
        c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */  
        b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */  
        /* Round 3 */  
        a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */  
        d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */  
        c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */  
        b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */  
        a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */  
        d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */  
        c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */  
        b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */  
        a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */  
        d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */  
        c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */  
        b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */  
        a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */  
        d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */  
        c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */  
        b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */  
        /* Round 4 */  
        a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */  
        d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */  
        c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */  
        b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */  
        a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */  
        d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */  
        c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */  
        b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */  
        a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */  
        d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */  
        c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */  
        b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */  
        a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */  
        d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */  
        c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */  
        b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */  
        state[0] += a;  
        state[1] += b;  
        state[2] += c;  
        state[3] += d;  
  
    }  
  
    /*Encode��long���鰴˳����byte���飬��Ϊjava��long������64bit�ģ�ֻ���32bit 
    */  
    private void Encode (byte[] output, long[] input, int len) {  
        int i, j;  
        for (i = 0, j = 0; j < len; i++, j += 4) {  
            output[j] = (byte)(input[i] & 0xffL);  
            output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);  
            output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);  
            output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);  
        }  
    }  
  
    /*Decode��byte���鰴˳��ϳɳ�long���飬��Ϊjava��long������64bit�ģ� 
    ֻ�ϳɵ�32bit����32bit���� 
    */  
    private void Decode (long[] output, byte[] input, int len) {  
        int i, j;  
        for (i = 0, j = 0; j < len; i++, j += 4)  
            output[i] = b2iu(input[j]) | (b2iu(input[j + 1]) << 8) |(b2iu(input[j + 2]) << 16) | (b2iu(input[j + 3]) << 24);  
        return;  
    }  
  
    /* 
    b2iu��һ����byte���ղ�������ŵ�ԭ��ģ���λ��������Ϊjavaû��unsigned���� 
    */  
    public static long b2iu(byte b) {  
        return b < 0 ? b & 0x7F + 128 : b;  
    }  
  
    /*byteHEX()��������һ��byte���͵���ת����ʮ����Ƶ�ASCII��ʾ�� 
    ����Ϊjava�е�byte��toString�޷�ʵ����һ�� 
    */  
    public static String byteHEX(byte ib) {  
        char[] Digit = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };  
        char [] ob = new char[2];  
        ob[0] = Digit[(ib >>> 4) & 0X0F];  
        ob[1] = Digit[ib & 0X0F];  
        String s = new String(ob);  
        return s;  
    }  
  
    public static String toMD5(String source){  
            MD5 md5 = new MD5();
            return md5.md5(source);  
    }  
    


    public static String getMD5(File file) {
        String md5 = null;
        try {
            md5 = DigestUtils.md5Hex(IOUtils.toString(new FileReader(file)));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return md5;
    }
}  