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| import java.security.MessageDigest; import java.util.Arrays; public class MD5Test{ private static final int A=0x67452301; private static final int B=0xefcdab89; private static final int C=0x98badcfe; private static final int D=0x10325476;
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 static final int GROUP_LEN = 64; public byte[] digest(byte[] input){ byte [] paddingData = getPaddingData(input); return process(paddingData); } private int[] getGroupData(byte[] data,int index){ int [] groupData=new int[16]; for(int i=0;i<16;i++){ groupData[i] = (data[4*i+index]&0xFF)| (data[4*i+1+index]&0xFF)<<8| (data[4*i+2+index]&0xFF)<<16| (data[4*i+3+index]&0xFF)<<24; } return groupData; } private int[] getConstTable() { int[] T = new int[64]; for(int i=1;i<65;i++) { T[i-1] = (int)((long)(Math.abs(Math.sin(i))*4294967296l)); } return T; } private byte[] getPaddingData(byte[] input) { int length = input.length; long bitLength = length << 3; int rest = length % 64; int paddingLength = 0; if(rest < 56) { paddingLength = 64-rest; }else { paddingLength = 128 - rest; } byte[] paddingData = new byte[length+paddingLength]; for(int i=0;i<length;i++) { paddingData[i] = input[i]; } paddingData[length] = (byte)(1<<7); for(int i=1;i<paddingLength-8;i++) { paddingData[length+i] = 0; } for(int i=0;i<8;i++){ paddingData[length+paddingLength-8+i]=(byte)(bitLength&0xFF); bitLength = bitLength >>> 8; } return paddingData; } private byte[] process(byte[] data) { int [] result = {A,B,C,D}; int length = data.length; int groupCount = length/64; int[] T = getConstTable(); for(int groupIndex=0;groupIndex<groupCount;groupIndex++){ int[] x=getGroupData(data,groupIndex*GROUP_LEN); int a = result[0]; int b = result[1]; int c = result[2]; int d = result[3]; a = FF(a, b, c, d, x[0], S11, T[0]); d = FF(d, a, b, c, x[1], S12, T[1]); c = FF(c, d, a, b, x[2], S13, T[2]); b = FF(b, c, d, a, x[3], S14, T[3]); a = FF(a, b, c, d, x[4], S11, T[4]); d = FF(d, a, b, c, x[5], S12, T[5]); c = FF(c, d, a, b, x[6], S13, T[6]); b = FF(b, c, d, a, x[7], S14, T[7]); a = FF(a, b, c, d, x[8], S11, T[8]); d = FF(d, a, b, c, x[9], S12, T[9]); c = FF(c, d, a, b, x[10], S13, T[10]); b = FF(b, c, d, a, x[11], S14, T[11]); a = FF(a, b, c, d, x[12], S11, T[12]); d = FF(d, a, b, c, x[13], S12, T[13]); c = FF(c, d, a, b, x[14], S13, T[14]); b = FF(b, c, d, a, x[15], S14, T[15]); a = GG(a, b, c, d, x[1], S21, T[16]); d = GG(d, a, b, c, x[6], S22, T[17]); c = GG(c, d, a, b, x[11], S23, T[18]); b = GG(b, c, d, a, x[0], S24, T[19]); a = GG(a, b, c, d, x[5], S21, T[20]); d = GG(d, a, b, c, x[10], S22, T[21]); c = GG(c, d, a, b, x[15], S23, T[22]); b = GG(b, c, d, a, x[4], S24, T[23]); a = GG(a, b, c, d, x[9], S21, T[24]); d = GG(d, a, b, c, x[14], S22, T[25]); c = GG(c, d, a, b, x[3], S23, T[26]); b = GG(b, c, d, a, x[8], S24, T[27]); a = GG(a, b, c, d, x[13], S21, T[28]); d = GG(d, a, b, c, x[2], S22, T[29]); c = GG(c, d, a, b, x[7], S23, T[30]); b = GG(b, c, d, a, x[12], S24, T[31]); a = HH(a, b, c, d, x[5], S31, T[32]); d = HH(d, a, b, c, x[8], S32, T[33]); c = HH(c, d, a, b, x[11], S33, T[34]); b = HH(b, c, d, a, x[14], S34, T[35]); a = HH(a, b, c, d, x[1], S31, T[36]); d = HH(d, a, b, c, x[4], S32, T[37]); c = HH(c, d, a, b, x[7], S33, T[38]); b = HH(b, c, d, a, x[10], S34, T[39]); a = HH(a, b, c, d, x[13], S31, T[40]); d = HH(d, a, b, c, x[0], S32, T[41]); c = HH(c, d, a, b, x[3], S33, T[42]); b = HH(b, c, d, a, x[6], S34, T[43]); a = HH(a, b, c, d, x[9], S31, T[44]); d = HH(d, a, b, c, x[12], S32, T[45]); c = HH(c, d, a, b, x[15], S33, T[46]); b = HH(b, c, d, a, x[2], S34, T[47]); a = II(a, b, c, d, x[0], S41, T[48]); d = II(d, a, b, c, x[7], S42, T[49]); c = II(c, d, a, b, x[14], S43, T[50]); b = II(b, c, d, a, x[5], S44, T[51]); a = II(a, b, c, d, x[12], S41, T[52]); d = II(d, a, b, c, x[3], S42, T[53]); c = II(c, d, a, b, x[10], S43, T[54]); b = II(b, c, d, a, x[1], S44, T[55]); a = II(a, b, c, d, x[8], S41, T[56]); d = II(d, a, b, c, x[15], S42, T[57]); c = II(c, d, a, b, x[6], S43, T[58]); b = II(b, c, d, a, x[13], S44, T[59]); a = II(a, b, c, d, x[4], S41, T[60]); d = II(d, a, b, c, x[11], S42, T[61]); c = II(c, d, a, b, x[2], S43, T[62]); b = II(b, c, d, a, x[9], S44, T[63]); result[0] += a; result[1] += b; result[2] += c; result[3] += d; } byte[] resultByte = new byte[16]; for(int i = 0;i<4;i++) { for(int j = 0; j < 4; j++) { resultByte[i*4+j] = (byte) (result[i] & 0xff); result[i]=result[i]>>8; } } return resultByte; } private static int F(int x, int y, int z) { return (x & y) | ((~x) & z); } private static int G(int x, int y, int z) { return (x & z) | (y & (~z)); } 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 x, int s, int t) { a += (F(b, c, d)&0xFFFFFFFF) + x + t; a = ((a&0xFFFFFFFF)<< s) | ((a&0xFFFFFFFF) >>> (32 - s)); a += b; return (a&0xFFFFFFFF); } private static int GG(int a, int b, int c, int d, int x, int s, int t) { a += (G(b, c, d)&0xFFFFFFFF) + x + t; a = ((a&0xFFFFFFFF) << s) | ((a&0xFFFFFFFF) >>> (32 - s)); a += b; return (a&0xFFFFFFFF); } private static int HH(int a, int b, int c, int d, int x, int s, int t) { a += (H(b, c, d)&0xFFFFFFFF) + x + t; a = ((a&0xFFFFFFFF) << s) | ((a&0xFFFFFFFF) >>> (32 - s)); a += b; return (a&0xFFFFFFFF); } private static int II(int a, int b, int c, int d, int x, int s,int t) { a += (I(b, c, d)&0xFFFFFFFF) + x + t; a = ((a&0xFFFFFFFF) << s) | ((a&0xFFFFFFFF) >>> (32 - s)); a += b; return (a&0xFFFFFFFF); } public static void main(String []args){ MD5Test myMd5=new MD5Test(); String testData = "hello,world"; System.out.println("--------My MD5--------"); byte[] myResult = myMd5.digest(testData.getBytes()); System.out.println(Arrays.toString(myResult)); System.out.println("--------Java MD5--------"); try { MessageDigest javaMd5 = MessageDigest.getInstance("MD5"); byte[] javaResult = javaMd5.digest(testData.getBytes()); System.out.println(Arrays.toString(javaResult)); } catch (Exception e) { e.printStackTrace(); } } }
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