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#include "crypto.h"
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
static const uint32_t K[] = {0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf,
0x4787c62a, 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340, 0x265e5a51,
0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, 0x21e1cde6, 0xc33707d6,
0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, 0xfffa3942,
0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8,
0xc4ac5665, 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92,
0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391};
static const uint32_t s[] = {7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21};
int l_md5(lua_State* L){
uint32_t a0 = 0x67452301;
uint32_t b0 = 0xefcdab89;
uint32_t c0 = 0x98badcfe;
uint32_t d0 = 0x10325476;
int len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, NULL);
for(int i = 0; a[i]!='\0'; i++) len++;
int tlen = ((((len + 8) /64) + 1) * 64) - 8;
uint8_t* b = NULL;
//set the rest to 0x00 for padding
b = calloc(tlen + 64, 1);
//add padding (0x80 to the end)
memcpy(b, a, len);
b[len] = 0x80;
//add length to end
uint32_t lhhh = 8*len;
memcpy(b + tlen, &lhhh, 1);
for(int z = 0; z < tlen; z+=(512/8)){
uint32_t* M = (uint32_t *) (b + z);
uint32_t A = a0;
uint32_t B = b0;
uint32_t C = c0;
uint32_t D = d0;
for(int i = 0; i < 64; i++){
uint32_t F, g;
if(i < 16){
F = (B & C) | ((~B) & D);
g = i;
} else if(i < 32){
F = (D & B) | ((~D) & C);
g = (5*i + 1) % 16;
} else if(i < 48){
F = B ^ C ^ D;
g = (3*i + 5) % 16;
} else {
F = C ^ (B | (~D));
g = (7*i) % 16;
}
F = F + A + K[i] + M[g];
uint32_t temp = D;
D = C;
C = B;
B = B + (F << s[i] | (F >> (32 - s[i])));
A = temp;
}
a0 += A;
b0 += B;
c0 += C;
d0 += D;
}
char ou[64];
sprintf(ou,"%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x%2.2x",
((uint8_t*)&a0)[0], ((uint8_t*)&a0)[1], ((uint8_t*)&a0)[2], ((uint8_t*)&a0)[3],
((uint8_t*)&b0)[0], ((uint8_t*)&b0)[1], ((uint8_t*)&b0)[2], ((uint8_t*)&b0)[3],
((uint8_t*)&c0)[0], ((uint8_t*)&c0)[1], ((uint8_t*)&c0)[2], ((uint8_t*)&c0)[3],
((uint8_t*)&d0)[0], ((uint8_t*)&d0)[1], ((uint8_t*)&d0)[2], ((uint8_t*)&d0)[3]);
lua_pushstring(L, ou);
free(b);
return 1;
};
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