md5outputstream.java

JAVA邮件系统

import java.io.IOException;
import java.io.OutputStream;

public class MD5OutputStream extends OutputStream
{
    public String byte2hex(byte data[])
    {
        StringBuffer result = new StringBuffer();
        for(int i = 0; i < data.length; i++)
        {
            char c = (char)(data[i] >> 4 & 0xf);
            if(c > '\t')
                c = (char)((c - 10) + 97);
            else
                c += '0';
            result.append(c);
            c = (char)(data[i] & 0xf);
            if(c > '\t')
                c = (char)((c - 10) + 97);
            else
                c += '0';
            result.append(c);
        }

        return result.toString();
    }
	
    private OutputStream os_;
    private static final int size = 16;
    private int buf[];
    private long i;
    private byte in[];
    private 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
    };
    private static final int S11 = 7;
    private static final int S12 = 12;
    private static final int S13 = 17;
    private static final int S14 = 22;
    private static final int S21 = 5;
    private static final int S22 = 9;
    private static final int S23 = 14;
    private static final int S24 = 20;
    private static final int S31 = 4;
    private static final int S32 = 11;
    private static final int S33 = 16;
    private static final int S34 = 23;
    private static final int S41 = 6;
    private static final int S42 = 10;
    private static final int S43 = 15;
    private static final int S44 = 21;

    public MD5OutputStream()
    {
        os_ = null;
        buf = new int[4];
        in = new byte[64];
        init();
    }

    public MD5OutputStream(OutputStream os)
    {
        os_ = null;
        buf = new int[4];
        in = new byte[64];
        os_ = os;
        init();
    }

    private static final int F(int x, int y, int z)
    {
        return x & y | ~x & z;
    }

    private static final int FF(int a, int b, int c, int d, int x, int s, int ac)
    {
        a += F(b, c, d) + x + ac;
        a = ROTATE_LEFT(a, s);
        a += b;
        return a;
    }

    private static final int G(int x, int y, int z)
    {
        return x & z | y & ~z;
    }

    private static final int GG(int a, int b, int c, int d, int x, int s, int ac)
    {
        a += G(b, c, d) + x + ac;
        a = ROTATE_LEFT(a, s);
        a += b;
        return a;
    }

    private static final int H(int x, int y, int z)
    {
        return x ^ y ^ z;
    }

    private static final int HH(int a, int b, int c, int d, int x, int s, int ac)
    {
        a += H(b, c, d) + x + ac;
        a = ROTATE_LEFT(a, s);
        a += b;
        return a;
    }

    private static final int I(int x, int y, int z)
    {
        return y ^ (x | ~z);
    }

    private static final int II(int a, int b, int c, int d, int x, int s, int ac)
    {
        a += I(b, c, d) + x + ac;
        a = ROTATE_LEFT(a, s);
        a += b;
        return a;
    }

    private static final int ROTATE_LEFT(int x, int n)
    {
        return x << n | x >>> 32 - n;
    }

    private void Transform(int in[])
    {
        int a = buf[0];
        int b = buf[1];
        int c = buf[2];
        int d = buf[3];
        a = FF(a, b, c, d, in[0], 7, 0xd76aa478);
        d = FF(d, a, b, c, in[1], 12, 0xe8c7b756);
        c = FF(c, d, a, b, in[2], 17, 0x242070db);
        b = FF(b, c, d, a, in[3], 22, 0xc1bdceee);
        a = FF(a, b, c, d, in[4], 7, 0xf57c0faf);
        d = FF(d, a, b, c, in[5], 12, 0x4787c62a);
        c = FF(c, d, a, b, in[6], 17, 0xa8304613);
        b = FF(b, c, d, a, in[7], 22, 0xfd469501);
        a = FF(a, b, c, d, in[8], 7, 0x698098d8);
        d = FF(d, a, b, c, in[9], 12, 0x8b44f7af);
        c = FF(c, d, a, b, in[10], 17, -42063);
        b = FF(b, c, d, a, in[11], 22, 0x895cd7be);
        a = FF(a, b, c, d, in[12], 7, 0x6b901122);
        d = FF(d, a, b, c, in[13], 12, 0xfd987193);
        c = FF(c, d, a, b, in[14], 17, 0xa679438e);
        b = FF(b, c, d, a, in[15], 22, 0x49b40821);
        a = GG(a, b, c, d, in[1], 5, 0xf61e2562);
        d = GG(d, a, b, c, in[6], 9, 0xc040b340);
        c = GG(c, d, a, b, in[11], 14, 0x265e5a51);
        b = GG(b, c, d, a, in[0], 20, 0xe9b6c7aa);
        a = GG(a, b, c, d, in[5], 5, 0xd62f105d);
        d = GG(d, a, b, c, in[10], 9, 0x2441453);
        c = GG(c, d, a, b, in[15], 14, 0xd8a1e681);
        b = GG(b, c, d, a, in[4], 20, 0xe7d3fbc8);
        a = GG(a, b, c, d, in[9], 5, 0x21e1cde6);
        d = GG(d, a, b, c, in[14], 9, 0xc33707d6);
        c = GG(c, d, a, b, in[3], 14, 0xf4d50d87);
        b = GG(b, c, d, a, in[8], 20, 0x455a14ed);
        a = GG(a, b, c, d, in[13], 5, 0xa9e3e905);
        d = GG(d, a, b, c, in[2], 9, 0xfcefa3f8);
        c = GG(c, d, a, b, in[7], 14, 0x676f02d9);
        b = GG(b, c, d, a, in[12], 20, 0x8d2a4c8a);
        a = HH(a, b, c, d, in[5], 4, 0xfffa3942);
        d = HH(d, a, b, c, in[8], 11, 0x8771f681);
        c = HH(c, d, a, b, in[11], 16, 0x6d9d6122);
        b = HH(b, c, d, a, in[14], 23, 0xfde5380c);
        a = HH(a, b, c, d, in[1], 4, 0xa4beea44);
        d = HH(d, a, b, c, in[4], 11, 0x4bdecfa9);
        c = HH(c, d, a, b, in[7], 16, 0xf6bb4b60);
        b = HH(b, c, d, a, in[10], 23, 0xbebfbc70);
        a = HH(a, b, c, d, in[13], 4, 0x289b7ec6);
        d = HH(d, a, b, c, in[0], 11, 0xeaa127fa);
        c = HH(c, d, a, b, in[3], 16, 0xd4ef3085);
        b = HH(b, c, d, a, in[6], 23, 0x4881d05);
        a = HH(a, b, c, d, in[9], 4, 0xd9d4d039);
        d = HH(d, a, b, c, in[12], 11, 0xe6db99e5);
        c = HH(c, d, a, b, in[15], 16, 0x1fa27cf8);
        b = HH(b, c, d, a, in[2], 23, 0xc4ac5665);
        a = II(a, b, c, d, in[0], 6, 0xf4292244);
        d = II(d, a, b, c, in[7], 10, 0x432aff97);
        c = II(c, d, a, b, in[14], 15, 0xab9423a7);
        b = II(b, c, d, a, in[5], 21, 0xfc93a039);
        a = II(a, b, c, d, in[12], 6, 0x655b59c3);
        d = II(d, a, b, c, in[3], 10, 0x8f0ccc92);
        c = II(c, d, a, b, in[10], 15, 0xffeff47d);
        b = II(b, c, d, a, in[1], 21, 0x85845dd1);
        a = II(a, b, c, d, in[8], 6, 0x6fa87e4f);
        d = II(d, a, b, c, in[15], 10, 0xfe2ce6e0);
        c = II(c, d, a, b, in[6], 15, 0xa3014314);
        b = II(b, c, d, a, in[13], 21, 0x4e0811a1);
        a = II(a, b, c, d, in[4], 6, 0xf7537e82);
        d = II(d, a, b, c, in[11], 10, 0xbd3af235);
        c = II(c, d, a, b, in[2], 15, 0x2ad7d2bb);
        b = II(b, c, d, a, in[9], 21, 0xeb86d391);
        buf[0] += a;
        buf[1] += b;
        buf[2] += c;
        buf[3] += d;
    }

    public byte[] digest()
    {
        byte buffer[] = new byte[16];
        finish();
        System.arraycopy(in, 0, buffer, 0, 16);
        init();
        return buffer;
    }

    private void finish()
    {
        int in2[] = new int[16];
        in2[14] = (int)(this.i & -1L);
        in2[15] = (int)(this.i >>> 32 & -1L);
        int mdi = (int)(this.i >> 3 & 63L);
        int padLen = mdi >= 56 ? 120 - mdi : 56 - mdi;
        update(PADDING, 0, padLen);
        int i = 0;
        for(int ii = 0; i < 14; ii += 4)
        {
            in2[i] = (in[ii + 3] & 0xff) << 24 | (in[ii + 2] & 0xff) << 16 | (in[ii + 1] & 0xff) << 8 | in[ii] & 0xff;
            i++;
        }

        Transform(in2);
        i = 0;
        for(int ii = 0; i < 4; ii += 4)
        {
            in[ii] = (byte)(buf[i] & 0xff);
            in[ii + 1] = (byte)(buf[i] >> 8 & 0xff);
            in[ii + 2] = (byte)(buf[i] >> 16 & 0xff);
            in[ii + 3] = (byte)(buf[i] >> 24 & 0xff);
            i++;
        }

    }

    public OutputStream getOutputStream()
    {
        return os_;
    }

    private void init()
    {
        i = 0L;
        buf[0] = 0x67452301;
        buf[1] = 0xefcdab89;
        buf[2] = 0x98badcfe;
        buf[3] = 0x10325476;
        for(int l = 0; l < 64; l++)
            in[l] = 0;

    }

    public void setOutputStream(OutputStream os)
    {
        os_ = os;
    }

    protected void update(byte data)
    {
        byte temp[] = {
            data
        };
        update(temp, 0, temp.length);
    }

    public void update(byte buffer[], int start, int length)
    {
        int mdi = (int)(this.i >> 3 & 63L);
        this.i += length << 3;
        while(length-- != 0) 
        {
            in[mdi++] = buffer[start++];
            if(mdi == 64)
            {
                int in2[] = new int[16];
                int i = 0;
                for(int ii = 0; i < 16; ii += 4)
                {
                    in2[i] = (in[ii + 3] & 0xff) << 24 | (in[ii + 2] & 0xff) << 16 | (in[ii + 1] & 0xff) << 8 | in[ii] & 0xff;
                    i++;
                }

                Transform(in2);
                mdi = 0;
            }
        }
    }

    public void write(int b)
        throws IOException
    {
        if(os_ != null)
            os_.write(b);
        update((byte)b);
    }

    public void write(byte b[], int off, int len)
        throws IOException
    {
        if(os_ != null)
            os_.write(b, off, len);
        update(b, off, len);
    }

}