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sys/random/sha1prng: rename seed size to state size

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This commit is contained in:
PeterKietzmann 2020-05-11 10:35:58 +02:00
parent 63a4d126e4
commit 3f626e39ab
1 changed files with 8 additions and 8 deletions
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16
sys/random/sha1prng.c
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@ -25,19 +25,19 @@
#include "hashes/sha1.h"
#define SEED_SIZE (20)
#define STATE_SIZE (SHA1_DIGEST_LENGTH)
static sha1_context ctx;
static uint32_t datapos = SEED_SIZE;
static int8_t digestdata[SEED_SIZE];
static int8_t prng_state[SEED_SIZE];
static uint32_t datapos = STATE_SIZE;
static int8_t digestdata[STATE_SIZE];
static int8_t prng_state[STATE_SIZE];
void _updatestate(int8_t *state)
{
signed last = 1;
char zf = 0;
for (int i = 0; i < 20; i++) {
for (int i = 0; i < STATE_SIZE; i++) {
signed v;
char t;
/* add two bytes */
@ -72,14 +72,14 @@ void _random_bytes(uint8_t *bytes, size_t size) /* TODO: use with global API */
{
int copy;
/* find min between remaining out bytes and so far unused seed bytes */
if ( (size-loc) < (SEED_SIZE - datapos) )
if ( (size-loc) < (STATE_SIZE - datapos) )
{
copy = size-loc;
}
else
{
/* in first iteration this will be 0 */
copy = SEED_SIZE - datapos;
copy = STATE_SIZE - datapos;
}
if (copy > 0)
{
@ -125,7 +125,7 @@ void random_init_by_array(uint32_t init_key[], int key_length)
sha1_final(&ctx, digestdata);
/* copy seeded SHA1 state to PRNG state */
memcpy(prng_state, &ctx.state, 20);
memcpy(prng_state, &ctx.state, STATE_SIZE);
}
uint32_t random_uint32(void)