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use /dev/urandom in example
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9
README
9
README
@ -10,17 +10,12 @@ Notes
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a) the signer only understands secp256k1 elliptic curve
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b) random generator in rand.c is using stdlib's rand() function.
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you should replace this code with one that uses a hardware random
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generator of your microcontroller in production.
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(see speed-stm32/rand.c for such example)
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c) there are executables:
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b) there are executables:
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* test-speed
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- check signing speed (sign 100x and compute speed from duration)
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* test-verify
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- generate random messages and private keys
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- check signature validity against OpenSSL (call verify method)
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d) directory speed-stm32 contains project for deploying the code
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c) directory speed-stm32 contains project for deploying the code
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on STM32 microcontroller and checking signing speed there
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12
rand.c
12
rand.c
@ -21,16 +21,18 @@
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <time.h>
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#include <stdio.h>
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#include "rand.h"
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static FILE *f;
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void init_rand(void) {
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srand(time(NULL));
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f = fopen("/dev/urandom", "r");
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}
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uint32_t random32(void) {
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return (rand() & 0xFF) + ((rand() & 0xFF) << 8) + ((rand() & 0xFF) << 16) + ((rand() & 0xFF) << 24);
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uint32_t r;
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fread(&r, 1, sizeof(r), f);
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return r;
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}
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