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MD5.cpp
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#include <string.h> //for memcpy
#include <iostream>
#include <string>
using namespace std;
typedef unsigned int uint;
typedef unsigned char uchar;
class MD5 {
public:
MD5(){};
string encode(const string &input) {
count[0] = 0, count[1] = 0;
state[0] = 0x67452301; // A
state[1] = 0xEFCDAB89; // B
state[2] = 0x98BADCFE; // C
state[3] = 0x10325476; // D
update((uchar *)input.c_str(), input.length());
uchar digest[16], bits[8], PADDING[64] = {0x80} /*第0个为0x80即10000000，后面剩下的默认为0*/;
uint index = (count[0] >> 3) & 0x3F, padlen = (index < 56) ? (56 - index) : (120 - index);
encode(bits, count, 8);
update(PADDING, padlen);
update(bits, 8);
encode(digest, state, 16);
string result;
for (int i = 0; i < 16; i++) {
char temp[3] = {0};
sprintf(temp, "%02x", digest[i]);
result += temp;
}
return result;
}
private:
static void encode(uchar *output, uint *input, uint len) {
for (uint i = 0, j = 0; j < len; i++, j += 4) {
output[j] = input[i] & 0xFF;
output[j + 1] = (input[i] >> 8) & 0xFF;
output[j + 2] = (input[i] >> 16) & 0xFF;
output[j + 3] = (input[i] >> 24) & 0xFF;
}
}
void process(uchar m[64]) {
uint a = state[0], b = state[1], c = state[2], d = state[3], x[16]; // step2
for (int i = 0, j = 0; i < 16; ++i, j += 4) // step1
x[i] = (m[j]) | (m[j + 1] << 8) | (m[j + 2] << 16) | (m[j + 3] << 24);
// step3
round1_fuction(a, b, c, d, x[0], 7, 0xd76aa478);
round1_fuction(d, a, b, c, x[1], 12, 0xe8c7b756);
round1_fuction(c, d, a, b, x[2], 17, 0x242070db);
round1_fuction(b, c, d, a, x[3], 22, 0xc1bdceee);
round1_fuction(a, b, c, d, x[4], 7, 0xf57c0faf);
round1_fuction(d, a, b, c, x[5], 12, 0x4787c62a);
round1_fuction(c, d, a, b, x[6], 17, 0xa8304613);
round1_fuction(b, c, d, a, x[7], 22, 0xfd469501);
round1_fuction(a, b, c, d, x[8], 7, 0x698098d8);
round1_fuction(d, a, b, c, x[9], 12, 0x8b44f7af);
round1_fuction(c, d, a, b, x[10], 17, 0xffff5bb1);
round1_fuction(b, c, d, a, x[11], 22, 0x895cd7be);
round1_fuction(a, b, c, d, x[12], 7, 0x6b901122);
round1_fuction(d, a, b, c, x[13], 12, 0xfd987193);
round1_fuction(c, d, a, b, x[14], 17, 0xa679438e);
round1_fuction(b, c, d, a, x[15], 22, 0x49b40821);
// step4
round2_fuction(a, b, c, d, x[1], 5, 0xf61e2562);
round2_fuction(d, a, b, c, x[6], 9, 0xc040b340);
round2_fuction(c, d, a, b, x[11], 14, 0x265e5a51);
round2_fuction(b, c, d, a, x[0], 20, 0xe9b6c7aa);
round2_fuction(a, b, c, d, x[5], 5, 0xd62f105d);
round2_fuction(d, a, b, c, x[10], 9, 0x02441453);
round2_fuction(c, d, a, b, x[15], 14, 0xd8a1e681);
round2_fuction(b, c, d, a, x[4], 20, 0xe7d3fbc8);
round2_fuction(a, b, c, d, x[9], 5, 0x21e1cde6);
round2_fuction(d, a, b, c, x[14], 9, 0xc33707d6);
round2_fuction(c, d, a, b, x[3], 14, 0xf4d50d87);
round2_fuction(b, c, d, a, x[8], 20, 0x455a14ed);
round2_fuction(a, b, c, d, x[13], 5, 0xa9e3e905);
round2_fuction(d, a, b, c, x[2], 9, 0xfcefa3f8);
round2_fuction(c, d, a, b, x[7], 14, 0x676f02d9);
round2_fuction(b, c, d, a, x[12], 20, 0x8d2a4c8a);
// step5
round3_fuction(a, b, c, d, x[5], 4, 0xfffa3942);
round3_fuction(d, a, b, c, x[8], 11, 0x8771f681);
round3_fuction(c, d, a, b, x[11], 16, 0x6d9d6122);
round3_fuction(b, c, d, a, x[14], 23, 0xfde5380c);
round3_fuction(a, b, c, d, x[1], 4, 0xa4beea44);
round3_fuction(d, a, b, c, x[4], 11, 0x4bdecfa9);
round3_fuction(c, d, a, b, x[7], 16, 0xf6bb4b60);
round3_fuction(b, c, d, a, x[10], 23, 0xbebfbc70);
round3_fuction(a, b, c, d, x[13], 4, 0x289b7ec6);
round3_fuction(d, a, b, c, x[0], 11, 0xeaa127fa);
round3_fuction(c, d, a, b, x[3], 16, 0xd4ef3085);
round3_fuction(b, c, d, a, x[6], 23, 0x04881d05);
round3_fuction(a, b, c, d, x[9], 4, 0xd9d4d039);
round3_fuction(d, a, b, c, x[12], 11, 0xe6db99e5);
round3_fuction(c, d, a, b, x[15], 16, 0x1fa27cf8);
round3_fuction(b, c, d, a, x[2], 23, 0xc4ac5665);
// step6
round4_fuction(a, b, c, d, x[0], 6, 0xf4292244);
round4_fuction(d, a, b, c, x[7], 10, 0x432aff97);
round4_fuction(c, d, a, b, x[14], 15, 0xab9423a7);
round4_fuction(b, c, d, a, x[5], 21, 0xfc93a039);
round4_fuction(a, b, c, d, x[12], 6, 0x655b59c3);
round4_fuction(d, a, b, c, x[3], 10, 0x8f0ccc92);
round4_fuction(c, d, a, b, x[10], 15, 0xffeff47d);
round4_fuction(b, c, d, a, x[1], 21, 0x85845dd1);
round4_fuction(a, b, c, d, x[8], 6, 0x6fa87e4f);
round4_fuction(d, a, b, c, x[15], 10, 0xfe2ce6e0);
round4_fuction(c, d, a, b, x[6], 15, 0xa3014314);
round4_fuction(b, c, d, a, x[13], 21, 0x4e0811a1);
round4_fuction(a, b, c, d, x[4], 6, 0xf7537e82);
round4_fuction(d, a, b, c, x[11], 10, 0xbd3af235);
round4_fuction(c, d, a, b, x[2], 15, 0x2ad7d2bb);
round4_fuction(b, c, d, a, x[9], 21, 0xeb86d391);
state[0] += a, state[1] += b, state[2] += c, state[3] += d; // step7，注: unsigned int 的加法相当于模2^32的加法
}
void update(uchar *input, uint input_length) {
uint index = count[0] / 8 % 64, part_length = 64 - index, i = 0;
if ((count[0] += (input_length << 3)) < (input_length << 3))
count[1]++;
count[1] += (input_length >> 29);
if (input_length >= part_length) {
memcpy(&buffer[index], input, part_length);
process(buffer);
for (i = part_length; i + 63 < input_length; i += 64)
process(&input[i]);
index = 0;
}
memcpy(&buffer[index], &input[i], input_length - i);
}
static uint F(uint x, uint y, uint z) {
return ((x & y) | (~x & z));
}
static uint G(uint x, uint y, uint z) {
return ((x & z) | (y & ~z));
}
static uint H(uint x, uint y, uint z) {
return (x ^ y ^ z);
}
static uint I(uint x, uint y, uint z) {
return (y ^ (x | ~z));
}
static uint rotate_left(uint x, uint n) { // 将x循环左移n位
return ((x << n) | (x >> (32 - n)));
}
static void round1_fuction(uint &a, uint b, uint c, uint d, uint i, uint s, uint t) {
a += F(b, c, d) + i + t;
a = rotate_left(a, s);
a += b;
}
static void round2_fuction(uint &a, uint b, uint c, uint d, uint i, uint s, uint t) {
a += G(b, c, d) + i + t;
a = rotate_left(a, s);
a += b;
}
static void round3_fuction(uint &a, uint b, uint c, uint d, uint i, uint s, uint t) {
a += H(b, c, d) + i + t;
a = rotate_left(a, s);
a += b;
}
static void round4_fuction(uint &a, uint b, uint c, uint d, uint i, uint s, uint t) {
a += I(b, c, d) + i + t;
a = rotate_left(a, s);
a += b;
}
uint count[2];
uint state[4]; // A,B,C,D
uchar buffer[64];
};
int main() {
MD5 md5;
string str = "HelloWorld"; // 68e109f0f40ca72a15e05cc22786f8e6
cout << md5.encode(str) << endl; // 68e109f0f40ca72a15e05cc22786f8e6
return 0;
}