md5.java

设备资产管理源代码和 公共的函数

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   MD5.java

package carven;


public class MD5
{

	String hex_chr;

	public MD5()
	{
		hex_chr = "0123456789abcdef";
	}

	private String rhex(int num)
	{
		String str = "";
		for (int j = 0; j <= 3; j++)
			str = String.valueOf(String.valueOf((new StringBuffer(String.valueOf(String.valueOf(str)))).append(hex_chr.charAt(num >> j * 8 + 4 & 0xf)).append(hex_chr.charAt(num >> j * 8 & 0xf))));

		return str;
	}

	private int[] str2blks_MD5(String str)
	{
		int nblk = (str.length() + 8 >> 6) + 1;
		int blks[] = new int[nblk * 16];
		int i = 0;
		for (i = 0; i < nblk * 16; i++)
			blks[i] = 0;

		for (i = 0; i < str.length(); i++)
			blks[i >> 2] |= str.charAt(i) << (i % 4) * 8;

		blks[i >> 2] |= 128 << (i % 4) * 8;
		blks[nblk * 16 - 2] = str.length() * 8;
		return blks;
	}

	private int add(int x, int y)
	{
		return (x & 0x7fffffff) + (y & 0x7fffffff) ^ x & 0x80000000 ^ y & 0x80000000;
	}

	private int rol(int num, int cnt)
	{
		return num << cnt | num >>> 32 - cnt;
	}

	private int cmn(int q, int a, int b, int x, int s, int t)
	{
		return add(rol(add(add(a, q), add(x, t)), s), b);
	}

	private int ff(int a, int b, int c, int d, int x, int s, int t)
	{
		return cmn(b & c | ~b & d, a, b, x, s, t);
	}

	private int gg(int a, int b, int c, int d, int x, int s, int t)
	{
		return cmn(b & d | c & ~d, a, b, x, s, t);
	}

	private int hh(int a, int b, int c, int d, int x, int s, int t)
	{
		return cmn(b ^ c ^ d, a, b, x, s, t);
	}

	private int ii(int a, int b, int c, int d, int x, int s, int t)
	{
		return cmn(c ^ (b | ~d), a, b, x, s, t);
	}

	public byte[] calcMD5(String str)
	{
		int tmp = 0;
		byte ret[] = new byte[16];
		int x[] = str2blks_MD5(str);
		int a = 0x67452301;
		int b = 0xefcdab89;
		int c = 0x98badcfe;
		int d = 0x10325476;
		for (int i = 0; i < x.length; i += 16)
		{
			int olda = a;
			int oldb = b;
			int oldc = c;
			int oldd = d;
			a = ff(a, b, c, d, x[i + 0], 7, 0xd76aa478);
			d = ff(d, a, b, c, x[i + 1], 12, 0xe8c7b756);
			c = ff(c, d, a, b, x[i + 2], 17, 0x242070db);
			b = ff(b, c, d, a, x[i + 3], 22, 0xc1bdceee);
			a = ff(a, b, c, d, x[i + 4], 7, 0xf57c0faf);
			d = ff(d, a, b, c, x[i + 5], 12, 0x4787c62a);
			c = ff(c, d, a, b, x[i + 6], 17, 0xa8304613);
			b = ff(b, c, d, a, x[i + 7], 22, 0xfd469501);
			a = ff(a, b, c, d, x[i + 8], 7, 0x698098d8);
			d = ff(d, a, b, c, x[i + 9], 12, 0x8b44f7af);
			c = ff(c, d, a, b, x[i + 10], 17, -42063);
			b = ff(b, c, d, a, x[i + 11], 22, 0x895cd7be);
			a = ff(a, b, c, d, x[i + 12], 7, 0x6b901122);
			d = ff(d, a, b, c, x[i + 13], 12, 0xfd987193);
			c = ff(c, d, a, b, x[i + 14], 17, 0xa679438e);
			b = ff(b, c, d, a, x[i + 15], 22, 0x49b40821);
			a = gg(a, b, c, d, x[i + 1], 5, 0xf61e2562);
			d = gg(d, a, b, c, x[i + 6], 9, 0xc040b340);
			c = gg(c, d, a, b, x[i + 11], 14, 0x265e5a51);
			b = gg(b, c, d, a, x[i + 0], 20, 0xe9b6c7aa);
			a = gg(a, b, c, d, x[i + 5], 5, 0xd62f105d);
			d = gg(d, a, b, c, x[i + 10], 9, 0x2441453);
			c = gg(c, d, a, b, x[i + 15], 14, 0xd8a1e681);
			b = gg(b, c, d, a, x[i + 4], 20, 0xe7d3fbc8);
			a = gg(a, b, c, d, x[i + 9], 5, 0x21e1cde6);
			d = gg(d, a, b, c, x[i + 14], 9, 0xc33707d6);
			c = gg(c, d, a, b, x[i + 3], 14, 0xf4d50d87);
			b = gg(b, c, d, a, x[i + 8], 20, 0x455a14ed);
			a = gg(a, b, c, d, x[i + 13], 5, 0xa9e3e905);
			d = gg(d, a, b, c, x[i + 2], 9, 0xfcefa3f8);
			c = gg(c, d, a, b, x[i + 7], 14, 0x676f02d9);
			b = gg(b, c, d, a, x[i + 12], 20, 0x8d2a4c8a);
			a = hh(a, b, c, d, x[i + 5], 4, 0xfffa3942);
			d = hh(d, a, b, c, x[i + 8], 11, 0x8771f681);
			c = hh(c, d, a, b, x[i + 11], 16, 0x6d9d6122);
			b = hh(b, c, d, a, x[i + 14], 23, 0xfde5380c);
			a = hh(a, b, c, d, x[i + 1], 4, 0xa4beea44);
			d = hh(d, a, b, c, x[i + 4], 11, 0x4bdecfa9);
			c = hh(c, d, a, b, x[i + 7], 16, 0xf6bb4b60);
			b = hh(b, c, d, a, x[i + 10], 23, 0xbebfbc70);
			a = hh(a, b, c, d, x[i + 13], 4, 0x289b7ec6);
			d = hh(d, a, b, c, x[i + 0], 11, 0xeaa127fa);
			c = hh(c, d, a, b, x[i + 3], 16, 0xd4ef3085);
			b = hh(b, c, d, a, x[i + 6], 23, 0x4881d05);
			a = hh(a, b, c, d, x[i + 9], 4, 0xd9d4d039);
			d = hh(d, a, b, c, x[i + 12], 11, 0xe6db99e5);
			c = hh(c, d, a, b, x[i + 15], 16, 0x1fa27cf8);
			b = hh(b, c, d, a, x[i + 2], 23, 0xc4ac5665);
			a = ii(a, b, c, d, x[i + 0], 6, 0xf4292244);
			d = ii(d, a, b, c, x[i + 7], 10, 0x432aff97);
			c = ii(c, d, a, b, x[i + 14], 15, 0xab9423a7);
			b = ii(b, c, d, a, x[i + 5], 21, 0xfc93a039);
			a = ii(a, b, c, d, x[i + 12], 6, 0x655b59c3);
			d = ii(d, a, b, c, x[i + 3], 10, 0x8f0ccc92);
			c = ii(c, d, a, b, x[i + 10], 15, 0xffeff47d);
			b = ii(b, c, d, a, x[i + 1], 21, 0x85845dd1);
			a = ii(a, b, c, d, x[i + 8], 6, 0x6fa87e4f);
			d = ii(d, a, b, c, x[i + 15], 10, 0xfe2ce6e0);
			c = ii(c, d, a, b, x[i + 6], 15, 0xa3014314);
			b = ii(b, c, d, a, x[i + 13], 21, 0x4e0811a1);
			a = ii(a, b, c, d, x[i + 4], 6, 0xf7537e82);
			d = ii(d, a, b, c, x[i + 11], 10, 0xbd3af235);
			c = ii(c, d, a, b, x[i + 2], 15, 0x2ad7d2bb);
			b = ii(b, c, d, a, x[i + 9], 21, 0xeb86d391);
			a = add(a, olda);
			b = add(b, oldb);
			c = add(c, oldc);
			d = add(d, oldd);
		}

		ret[0] = (byte)(a >> 0 & 0xff);
		ret[1] = (byte)(a >> 8 & 0xff);
		ret[2] = (byte)(a >> 16 & 0xff);
		ret[3] = (byte)(a >> 24 & 0xff);
		ret[4] = (byte)(b >> 0 & 0xff);
		ret[5] = (byte)(b >> 8 & 0xff);
		ret[6] = (byte)(b >> 16 & 0xff);
		ret[7] = (byte)(b >> 24 & 0xff);
		ret[8] = (byte)(c >> 0 & 0xff);
		ret[9] = (byte)(c >> 8 & 0xff);
		ret[10] = (byte)(c >> 16 & 0xff);
		ret[11] = (byte)(c >> 24 & 0xff);
		ret[12] = (byte)(d >> 0 & 0xff);
		ret[13] = (byte)(d >> 8 & 0xff);
		ret[14] = (byte)(d >> 16 & 0xff);
		ret[15] = (byte)(d >> 24 & 0xff);
		return ret;
	}
}