Topic: Exercício pessoal: Private Keys e Addresses Bitcoin em Python (Read 578 times)

#include 
#include 
#include 
#include 
#include 
#include 

int main(void) {
    uint8_t bytes = ceil(log2(pow(2, 256) - 1) + 1) / 8;
    // uint8_t bytes = 2;
    FILE* fpointer = NULL;
    unsigned char* data = NULL;
    mpz_t imp_val;

    mpz_init(imp_val);

    if( (data = (unsigned char*) malloc(bytes)) == NULL) {
        printf("Memory error!\n");
        exit(-1);
    }

    printf("bytes: %d\n", bytes); 

    if( (fpointer = fopen("/dev/urandom", "rb")) == NULL )
        return -1;

    fread(data, bytes, 1, fpointer);

    printf("0x");
    for(uint8_t i = 0; i < bytes; i++){
        printf("%02hhx", data[i]);
    }
    printf("\n");
    mpz_import(imp_val, 1, 1, 32, 1, 0, data);
    gmp_printf("0x%Zx\n", imp_val);
    mpz_clear(imp_val);
    free(data);
    fclose(fpointer);
    return 0;
}

#include 
#include 
#include 
#include 
#include 
#include 

int main(void) {
    uint8_t bytes = ceil(log2(pow(2, 256) - 1) + 1) / 8;
    FILE* fpointer = NULL;
    char* data = NULL;
    mpz_t imp_val;

    mpz_init(imp_val);

    if( (data = (char*) malloc(bytes)) == NULL) {
        printf("Memory error!\n");
        exit(-1);
    }

    printf("bytes: %d\n", bytes); 

    if( (fpointer = fopen("/dev/urandom", "rb")) == NULL )
        return -1;
    // rewind(fpointer);

    for(uint8_t i = 0; i < bytes; i++){
        fread(&data[i], 1, 1, fpointer);
        printf("%x", data[i]);
    }
    printf("\n");
    printf("Len: %ld\n", strlen(data));
    printf("Sizeof: %lu\n", sizeof(data[0]));
    mpz_import(imp_val, 32, 1, sizeof(data[0]), 0, 0, data);
    gmp_printf("Data: %Zb\n", imp_val);
    mpz_clear(imp_val);
    free(data);
    fclose(fpointer);
    return 0;
}

$ ./randoma
bytes: 32
07 4b fffffffe ffffffd6 60 03 ffffffa0 ffffff85 ffffffdb ffffffed 24 fffffff3 58 10 48 03 60 ffffff81 33 6d fffffff1 66 59 ffffff80 ffffffb0 ffffffdc fffffff6 ffffffee 5d 3f 07 ffffffad 
Len: 32
Sizeof: 1
Data: 11111111111110011101000100000111001010101110000

2 ** 256 - 2 ** 32 - 2 ** 9 - 2 ** 8 - 2 ** 7 - 2 ** 6 - 2 ** 4 - 1
=
115792089237316195423570985008687907853269984665640564039457584007908834671663
=
0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f

0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffc2f