part1.cpp

#include <stdio.h>


int main() {
    unsigned int expected[8] = {0};
    expected[0] = 0x95cb8dbd;
    expected[1] = 0xf84cc79;
    expected[2] = 0xb899a876;
    expected[3] = 0xa5dab55;
    expected[4] = 0x9a8b3bba;
    expected[5] = 0x70b238a7;
    expected[6] = 0x72b53cf1;
    expected[7] = 0xd47c0209;
    int xxx=0;
    int i = 0;
    while (i < 4)
    {
        //printf("i=%d\n",i);
label:
        int res;
        for(unsigned int A=0x0; A<=0xff; ++A) {
            for(unsigned int B=0x0; B<=0xff; ++B) {
                //printf(".");
                res = 1;
                unsigned int v1 = A; //(unsigned __int8)flag[i];
                unsigned int v2 = B; //(unsigned __int8)flag[i + 4];
                unsigned int k = 0;
                unsigned int key[4] = {0};
                key[0] = 0x43;
                key[1] = 0x30;
                key[2] = 0x52;
                key[3] = 0x33;
                for (int j = 0; j <= 31; ++j )
                {
                    xxx++;
                    v1 = v1 + (k + key[k & 3] ^ ((v2 << 4) ^ (v2 >> 5)) + v2);
                    k += 0x1337dead;
                    v2 = v2 + (k + key[k >> 11 & 3] ^ ((v1 * 0x10) ^ (v1 >> 5)) + v1);
                }

                if ( v1 != expected[2 * i] )
                {
                    //printf("v1 = %x, expected = %x\n", v1, expected[2*i]);
                    res = 0;
                }
                if ( v2 != expected[2 * i + 1] )
                {
                    //printf("v2 = %x\n", v2);
                    res = 0;
                }
                if (res == 1) {
                    printf("i=%d, A=%c, B=%c\n", i, A, B);
                    res = 0;
                    i++;
                    //return 0;
                    goto label;
                }
            }
        }
    }
    printf("xxx=%d\n", xxx);
}