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Increasing random buffer and checks.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-03-10 00:13:13 +01:00
parent 213b675b9f
commit f1c0b12f5c
2 changed files with 8 additions and 2 deletions
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5
src/hsm/sc_hsm.c
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@@ -420,7 +420,10 @@ static int cmd_reset_retry() {
} }
static int cmd_challenge() { static int cmd_challenge() {
res_APDU = (uint8_t *)random_bytes_get(apdu.expected_res_size); uint8_t *rb = (uint8_t *)random_bytes_get(apdu.expected_res_size);
if (!rb)
return SW_WRONG_LENGTH();
res_APDU = rb;
res_APDU_size = apdu.expected_res_size; res_APDU_size = apdu.expected_res_size;
return SW_OK(); return SW_OK();
} }

5
src/rng/random.c
View File

@@ -49,9 +49,12 @@ void random_fini (void)
* Return pointer to random 32-byte * Return pointer to random 32-byte
*/ */
void random_bytes_free (const uint8_t *p); void random_bytes_free (const uint8_t *p);
#define MAX_RANDOM_BUFFER 1024
const uint8_t * random_bytes_get (size_t len) const uint8_t * random_bytes_get (size_t len)
{ {
static uint32_t return_word[512/sizeof(uint32_t)]; if (len > MAX_RANDOM_BUFFER)
return NULL;
static uint32_t return_word[MAX_RANDOM_BUFFER/sizeof(uint32_t)];
for (int ix = 0; ix < len; ix += RANDOM_BYTES_LENGTH) { for (int ix = 0; ix < len; ix += RANDOM_BYTES_LENGTH) {
neug_wait_full (); neug_wait_full ();
memcpy(return_word+ix/sizeof(uint32_t), random_word, RANDOM_BYTES_LENGTH); memcpy(return_word+ix/sizeof(uint32_t), random_word, RANDOM_BYTES_LENGTH);