1
0
mirror of https://github.com/trezor/trezor-firmware.git synced 2024-11-12 18:49:07 +00:00

use /dev/urandom in example

This commit is contained in:
Pavol Rusnak 2013-08-21 20:23:43 +02:00
parent 0f7c3be5dd
commit 4593b3f636
3 changed files with 11 additions and 12 deletions

9
README
View File

@ -10,17 +10,12 @@ Notes
a) the signer only understands secp256k1 elliptic curve
b) random generator in rand.c is using stdlib's rand() function.
you should replace this code with one that uses a hardware random
generator of your microcontroller in production.
(see speed-stm32/rand.c for such example)
c) there are executables:
b) there are executables:
* test-speed
- check signing speed (sign 100x and compute speed from duration)
* test-verify
- generate random messages and private keys
- check signature validity against OpenSSL (call verify method)
d) directory speed-stm32 contains project for deploying the code
c) directory speed-stm32 contains project for deploying the code
on STM32 microcontroller and checking signing speed there

12
rand.c
View File

@ -21,16 +21,18 @@
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <time.h>
#include <stdio.h>
#include "rand.h"
static FILE *f;
void init_rand(void) {
srand(time(NULL));
f = fopen("/dev/urandom", "r");
}
uint32_t random32(void) {
return (rand() & 0xFF) + ((rand() & 0xFF) << 8) + ((rand() & 0xFF) << 16) + ((rand() & 0xFF) << 24);
uint32_t r;
fread(&r, 1, sizeof(r), f);
return r;
}

2
rand.h
View File

@ -24,6 +24,8 @@
#ifndef __RAND_H__
#define __RAND_H__
#include <stdint.h>
void init_rand(void);
uint32_t random32(void);