pbkdf2.c

#include <stdio.h>
#include <CommonCrypto/CommonKeyDerivation.h>
#include <CommonCrypto/CommonCryptor.h>
#include <assert.h>
#include <dispatch/dispatch.h>
 
int main (int argc, char *argv[]) {
    uint64_t salt = 0;
 
    dispatch_group_t group = dispatch_group_create();
    for (int i = 0; i <= 9999; i++) {
        char *pass;
        asprintf(&pass, "%d", i);
 
        dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
            uint8_t result[1024];
            int ret = CCKeyDerivationPBKDF(kCCPBKDF2, pass, strlen(pass), (const uint8_t *) &salt, sizeof(salt), kCCPRFHmacAlgSHA256, 10000, result, sizeof(result));
            assert(ret == kCCSuccess);
            free(pass);
 
            if (i > 0 && i % 1000 == 0) {
                printf(": Derived first %d keys\n", i);
            } else if (i > 0 && i % 100 == 0) {
                printf(".");
                fflush(stdout);
            }
        });
    }
 
    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        printf(": Completed PBKDF2-HMAC-SHA256 (10K rounds) for all pins (0 - 9999)\n");
        exit(1);
    });
 
    dispatch_main();
    return 0;
}