mirror of
https://github.com/Llewellynvdm/Tomb.git
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60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <gcrypt.h>
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static long bench(int ic) {
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char *pass = "mypass";
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unsigned char *salt = "abcdefghijklmno";
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int salt_len = strlen(salt);
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int result_len = 64;
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unsigned char *result = calloc(result_len, sizeof(char));
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struct timeval start, end;
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long microtime;
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gettimeofday(&start, NULL);
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gcry_kdf_derive( pass, strlen(pass), GCRY_KDF_PBKDF2, GCRY_MD_SHA1, salt, salt_len, ic, result_len, result);
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gettimeofday(&end, NULL);
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microtime = 1000000*end.tv_sec+end.tv_usec - (1000000*start.tv_sec+start.tv_usec);
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return (long)microtime;
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}
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int main(int argc, char *argv[])
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{
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long desired_time = 1000000;
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long microtime;
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int ic=100;
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int tries=0;
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if(argc >= 2)
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sscanf(argv[1], "%ld", &desired_time);
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if (!gcry_check_version ("1.5.0")) {
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fputs ("libgcrypt version mismatch\n", stderr);
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exit (2);
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}
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/* Allocate a pool of 16k secure memory. This make the secure memory
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available and also drops privileges where needed. */
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gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
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/* It is now okay to let Libgcrypt complain when there was/is
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a problem with the secure memory. */
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gcry_control (GCRYCTL_RESUME_SECMEM_WARN);
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/* Tell Libgcrypt that initialization has completed. */
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gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
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microtime = bench(ic);
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while( abs(desired_time-microtime) > (desired_time/10) /*little difference */
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&& tries++ <= 5) {
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float ratio = (float)desired_time/microtime;
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if(ratio > 1000) ratio=1000.0;
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ic*=ratio;
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if(ic<1) ic=1;
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microtime = bench(ic);
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}
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printf("%d\n", ic);
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return 0;
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}
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