企业政府JSP科技企业信息管理系统Eclipse版

package MD5; import java.lang.reflect.*; public class MD5 { /* ������ЩS11-S44ʵ������һ��4*4�ľ�����ԭʼ��Cʵ��������#define ʵ�ֵģ� ���������ʵ�ֳ�Ϊstatic final�DZ�ʾ��ֻ�c�������ͬ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]; /* getMD5ofStr����MD5����Ҫ�Ĺ�����������ڲ���������Ҫ����MD5�任���ַ� ���ص��DZ任��Ľ��������Ǵӹ�����ԱdigestHexStrȡ�õģ� */ public String getMD5ofStr(String inbuf) { md5Init(); md5Update(inbuf.getBytes(), inbuf.length()); md5Final(); digestHexStr = ""; for (int i = 0; i < 16; i++) { digestHexStr += byteHEX(digest[i]); } return digestHexStr; } // ����MD5�����ı�׼���캯��JavaBeanҪ����һ��public�IJ���û�в���Ĺ��캯�� public MD5() { md5Init(); return; } /* md5Init��һ���ʼ�������ʼ�����ı���װ���׼�Ļ��� */ private void md5Init() { count[0] = 0L; count[1] = 0L; ///* Load magic initialization constants. state[0] = 0x67452301L; state[1] = 0xefcdab89L; state[2] = 0x98badcfeL; state[3] = 0x10325476L; return; } /* F, G, H ,I ��4����MD5������ԭʼ��MD5��Cʵ���У����������� �򵥵�λ���㣬���ܳ���Ч�ʵĿ��ǰ�����ʵ�ֳ��˺꣬��java�У����ǰ����� ����ʵ�ֳ���private���������ֱ�����ԭ4C�еġ� */ 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���� ������getMD5ofStr���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