/*
 * Simple MD5 implementation
 *
 * Compile with: gcc -o md5 -O3 -lm md5.c
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

void md5(uint8_t *initial_msg, size_t initial_len) {

    // Message (to prepare)
    uint8_t *msg = NULL;

    // Note: All variables are unsigned 32 bit and wrap modulo 2^32 when calculating

  int new_len;
    for(new_len = initial_len*8 + 1; new_len%512!=448; new_len++);
    new_len /= 8;

    msg = calloc(new_len + 64, 1); // also appends "0" bits
                                   // (we alloc also 64 extra bytes...)
    memcpy(msg, initial_msg, initial_len);
    msg[initial_len] = 128; // write the "1" bit

    uint32_t bits_len = 8*initial_len; // note, we append the len
memcpy(msg + new_len, &bits_len, 4);

int main(int argc, char **argv) {

    if (argc < 2) {
        printf("usage: %s 'string'\n", argv[0]);
        return 1;
    }

    char *msg = argv[1];
    size_t len = strlen(msg);

    // benchmark
     int i;
    for (i = 0; i < 1000000; i++) {
        md5(msg, len);
    }

    //var char digest[16] := h0 append h1 append h2 append h3 //(Output is in little-endian)
    uint8_t *p;

    // display result

    //p=(uint8_t *)&h0;
    printf("%2.2x%2.2x%2.2x%2.2x", *msg);



    return 0;
}