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allow reading arbitrary number of bytes from xmpp_rand_bytes()

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If we expose the API it shouldn't be limited.

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
This commit is contained in:
Steffen Jaeckel
2022-02-04 13:35:13 +01:00
parent 9c7b8580d8
commit 69550f9be9
1 changed files with 12 additions and 6 deletions
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18
src/rand.c
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@@ -284,12 +284,18 @@ void xmpp_rand_free(xmpp_ctx_t *ctx, xmpp_rand_t *rand)
void xmpp_rand_bytes(xmpp_rand_t *rand, unsigned char *output, size_t len) void xmpp_rand_bytes(xmpp_rand_t *rand, unsigned char *output, size_t len)
{ {
int rc; int rc;
size_t gen, tot = 0;
rc = Hash_DRBG_Generate(&rand->ctx, (uint8_t *)output, len); while (tot < len) {
if (rc == RESEED_NEEDED) { gen = len - tot;
xmpp_rand_reseed(rand); if (gen > GENERATE_MAX)
rc = Hash_DRBG_Generate(&rand->ctx, (uint8_t *)output, len); gen = GENERATE_MAX;
assert(rc == 0); rc = Hash_DRBG_Generate(&rand->ctx, (uint8_t *)output + tot, gen);
if (rc == RESEED_NEEDED) {
xmpp_rand_reseed(rand);
rc = Hash_DRBG_Generate(&rand->ctx, (uint8_t *)output + tot, gen);
assert(rc == 0);
}
tot += gen;
} }
} }