lymd5.java

JAVA开发的

package ly.util;

import java.io.*;

public class lyMD5 {

	public static final char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6',
			'7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };

	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;

	private long count;

	/** 4 32-bit words (interim result) */
	private int[] context = new int[4];

	/** 512 bits work buffer = 16 x 32-bit words */
	private int[] x = new int[16];

	private byte digestBits[];

	private byte buffer[];

	/**
	 * Constructor RichMD5
	 * 
	 * 
	 */
	public lyMD5() {
		MD5Init();
	}

	protected void MD5Init() {

		// initial values of MD5 i.e. A, B, C, D
		context[0] = 0x67452301;
		context[1] = 0xEFCDAB89;
		context[2] = 0x98BADCFE;
		context[3] = 0x10325476;
		buffer = new byte[64];
		count = 0L;
		digestBits = new byte[16];

		for (int i = 0; i < digestBits.length; i++) {
			digestBits[i] = 0;
		}
	}

	public void MD5Update(byte[] input, int inputLen) {

		int k = 0;
		int j = inputLen;

		while (j > 0) {
			int l = (int) (count >>> 3 & 63L);

			if ((l == 0) && (j > 64)) {
				count += 512L;

				MD5Transform(input, k);

				j -= 64;
				k += 64;
			} else {
				count += 8L;
				buffer[l] = input[k];

				if (l >= 63) {
					MD5Transform(buffer, 0);
				}

				k++;
				j--;
			}
		}
	}

	/**
	 * Method MD5Final
	 * 
	 * 
	 * @return
	 * 
	 */
	public byte[] MD5Final() {

		byte abyte0[] = new byte[8];

		for (int i = 0; i < 8; i++) {
			abyte0[i] = (byte) (int) (count >>> i * 8 & 255L);
		}

		/* Pad out to 56 mod 64. */
		int index = (int) (count >> 3) & 0x3f;

		/*
		 * Apply the padding
		 */
		int padLen = (index >= 56) ? 120 - index : 56 - index;
		byte abyte1[] = new byte[padLen];

		abyte1[0] = -128;

		MD5Update(abyte1, abyte1.length);
		MD5Update(abyte0, abyte0.length);

		for (int j = 0; j < 4; j++) {
			for (int i1 = 0; i1 < 4; i1++) {
				digestBits[j * 4 + i1] = (byte) (context[j] >>> i1 * 8 & 0xff);
			}
		}

		/* Store state in digest */
		byte abyte2[] = new byte[16];

		System.arraycopy(digestBits, 0, abyte2, 0, 16);
		MD5Init();

		return abyte2;
	}

	protected void MD5Transform(byte[] block, int offset) {

		/*
		 * Decodes 64 bytes from input block into an array of 16 32-bit
		 * entities. Decode function in reference
		 */
		for (int i = 0; i < 16; i++) {
			x[i] = (block[offset++] & 0xFF) | (block[offset++] & 0xFF) << 8
					| (block[offset++] & 0xFF) << 16
					| (block[offset++] & 0xFF) << 24;
		}

		int a = context[0];
		int b = context[1];
		int c = context[2];
		int d = context[3];

		/* Round 1 */
		a = FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */
		d = FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */
		c = FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */
		b = FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
		a = FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
		d = FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
		c = FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
		b = FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */
		a = FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */
		d = FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */
		c = FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
		b = FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
		a = FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
		d = FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
		c = FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
		b = FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */

		/* Round 2 */
		a = GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */
		d = GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */
		c = GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
		b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
		a = GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */
		d = GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */
		c = GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
		b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */
		a = GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */
		d = GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
		c = GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
		b = GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */
		a = GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
		d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */
		c = GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */
		b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */

		/* Round 3 */
		a = HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */
		d = HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */
		c = HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
		b = HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
		a = HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */
		d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */
		c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */
		b = HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
		a = HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
		d = HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */
		c = HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */
		b = HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */
		a = HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */
		d = HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
		c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
		b = HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */

		/* Round 4 */
		a = II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */
		d = II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */
		c = II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
		b = II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */
		a = II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
		d = II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */
		c = II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
		b = II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */
		a = II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */
		d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
		c = II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */
		b = II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
		a = II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */
		d = II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
		c = II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */
		b = II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */
		context[0] += a;
		context[1] += b;
		context[2] += c;
		context[3] += d;
	}

	private static int F(int x, int y, int z) {
		return (z ^ (x & (y ^ z)));
	}

	private static int G(int x, int y, int z) {
		return (y ^ (z & (x ^ y)));
	}

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

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

	private static int FF(int a, int b, int c, int d, int k, int s, int t) {

		a += k + t + F(b, c, d);
		a = (a << s | a >>> -s);

		return a + b;
	}

	private static int GG(int a, int b, int c, int d, int k, int s, int t) {

		a += k + t + G(b, c, d);
		a = (a << s | a >>> -s);

		return a + b;
	}

	private static int HH(int a, int b, int c, int d, int k, int s, int t) {

		a += k + t + H(b, c, d);
		a = (a << s | a >>> -s);

		return a + b;
	}

	private int II(int a, int b, int c, int d, int k, int s, int t) {

		a += k + t + I(b, c, d);
		a = (a << s | a >>> -s);

		return a + b;
	}

	public String getMD5Digest(String msg) throws Exception// 返回指定String的Digest
	{

		byte[] testBytes = msg.getBytes();

		/*
		 * Update the digest with data normally the data can be updated at
		 * different times
		 */
		this.MD5Update(testBytes, testBytes.length);
		byte[] digest = this.MD5Final();
		byte[] testDigest = msg.getBytes();
		char[] buf = new char[digest.length * 2];
		int j = 0;
		int k;
		for (int i = 0; i < digest.length; i++) {
			k = digest[i];
			buf[j++] = hexDigits[(k >>> 4) & 0x0F];
			buf[j++] = hexDigits[k & 0x0F];
		}
		String buffer = new String(buf);

		return buffer;

	}

	public String getMD5Digest(java.io.File f) throws Exception// 返回指定File的Digest
	{
		InputStream in = new FileInputStream(f);
		ByteArrayOutputStream bout = new ByteArrayOutputStream();
		byte[] tmpbuf = new byte[1024];
		int count = 0;
		while ((count = in.read(tmpbuf)) != -1) {
			bout.write(tmpbuf, 0, count);
			tmpbuf = new byte[1024];
		}
		in.close();
		byte[] testBytes = bout.toByteArray();
		this.MD5Update(testBytes, testBytes.length);
		byte[] digest = this.MD5Final();
		byte[] testDigest = testBytes;
		char[] buf = new char[digest.length * 2];
		int j = 0;
		int k;
		for (int i = 0; i < digest.length; i++) {
			k = digest[i];
			buf[j++] = hexDigits[(k >>> 4) & 0x0F];
			buf[j++] = hexDigits[k & 0x0F];
		}
		String buffer = new String(buf);

		return buffer;

	}
	/*
	 * 实例化 lyMD5 调用lyMD5.getMD5Digest() public static void main(String[] args){
	 * lyMD5 ly=new lyMD5();
	 * 
	 * if(args.length!=1) { System.out.println("Useage: lyMD5 Message "); }else{
	 * try{ System.out.println("Digest : "+ly.getMD5Digest(new File(args[0])));
	 * 
	 * }catch(Exception e){ System.out.println(e); } }
	 *  }
	 */

}