MD5算法的java实现

//MD5值计算工具 public class MD5Tool { private int A = 0x67452301; private int B = 0xefcdab89; private int C = 0x98badcfe; private int D = 0x10325476; private static int S11 = 7; private static int S12 = 12; private static int S13 = 17; private static int S14 = 22; private static int S21 = 5; private static int S22 = 9; private static int S23 = 14; private static int S24 = 20; private static int S31 = 4; private static int S32 = 11; private static int S33 = 16; private static int S34 = 23; private static int S41 = 6; private static int S42 = 10; private static int S43 = 15; private static int S44 = 21; public int F(int x, int y ,int z){ return (((x) & (y)) | ((~x) & (z))); } public int G(int x, int y ,int z){ return (((x) & (z)) | ((y) & (~z))); } public int H(int x, int y ,int z){ return ((x) ^ (y) ^ (z)); } public int I(int x, int y ,int z){ return ((y) ^ ((x) | (~z))); } public int RL(int x, int y){ return (((x) << (y)) | ((x) >> (32 - (y)))); } public int FF(int a, int b, int c, int d, int x, int s, int ac){ return b + (RL((a + F(b,c,d) + x + ac),s)); } public int GG(int a, int b, int c, int d, int x, int s, int ac){ return b + (RL((a + G(b,c,d) + x + ac),s)); } public int HH(int a, int b, int c, int d, int x, int s, int ac){ return b + (RL((a + H(b,c,d) + x + ac),s)); } public int II(int a, int b, int c, int d, int x, int s, int ac){ return b + (RL((a + I(b,c,d) + x + ac),s)); } public int PP(int x){ return (x<<24)|((x<<8)&0xff0000)|((x>>8)&0xff00)|(x>>24); } public void MD5Rounds(int[] x){ int a = A; int b = B; int c = C; int d = D; /* 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 */ A += a; B += b; C += c; D += d; } //根据字符串生成MD5值 public String GenerateMD5FromString(String message){ byte[] bytes = message.getBytes(); int len = bytes.length; byte[] intByte = new byte[4]; int[] x = new int[16]; byte [] fillByte; int modValue = len%64; if(modValue > 56){ fillByte = new byte[64+modValue]; byte[] tem = new byte[len+64+modValue]; for(int i = 0; i<len; i++){ tem[i] = bytes[i]; } tem[len] = (byte)128; for(int i = len+1; i<len+64+modValue-8;i++){ tem[i] = 0; } byte[] lenByte = int2byteArray(len); int j = 0; for(int i = len+64+modValue-8; i < len+64+modValue; i++){ tem[i] = lenByte[j]; j++; } bytes = tem; }else{ fillByte = new byte[64-modValue]; byte[] tem = new byte[len+64-modValue]; for(int i = 0; i<len; i++){ tem[i] = bytes[i]; } if(modValue != 56){ tem[len] = (byte)128; } byte[] lenByte = int2byteArray(len); int j = 0; for(int i = len+64+modValue-8; i < len+64-modValue; i++){ tem[i] = lenByte[j]; j++; } bytes = tem; } for(int i = 0; i<bytes.length/64; i ++){ for(int j = 0; j<16; j++){ for(int k = 0; k < 4; k++){ intByte[k] = bytes[i*64+j*4+k]; } x[j] = byteArray2int(intByte); } MD5Rounds(x); } return Integer.toHexString(A)+" "+Integer.toHexString(B)+" "+Integer.toHexString(C)+" "+Integer.toHexString(D); } public byte[] int2byteArray(int i){ byte[] result = new byte[8]; result[0] = 0; result[1] = 0; result[2] = 0; result[3] = 0; result[4] = (byte)((i>>24)&0xff); result[5] = (byte)((i>>16)&0xff); result[6] = (byte)((i>>8)&0xff); result[7] = (byte)((i)&0xff); return result; } public int byteArray2int(byte[] byteArray){ int num = 0; for (int i = 0; i < 4; i++) { num <<= 8; num |= (byteArray[i] & 0xff); } return num; } public String GenerateMD5FromFile(String filePath){ return "MD5"; } }