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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "blapi.h"
#include "blapit.h"
#include "chacha20.h"
#include "nssilock.h"
#include "seccomon.h"
#include "secerr.h"
static unsigned long globalNumCalls = 0;
SECStatus
prng_ResetForFuzzing(PZLock *rng_lock)
{
/* Check for a valid RNG lock. */
PORT_Assert(rng_lock != NULL);
if (rng_lock == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
/* --- LOCKED --- */
PZ_Lock(rng_lock);
globalNumCalls = 0;
PZ_Unlock(rng_lock);
/* --- UNLOCKED --- */
return SECSuccess;
}
SECStatus
prng_GenerateDeterministicRandomBytes(PZLock *rng_lock, void *dest, size_t len)
{
static const uint8_t key[32];
uint8_t nonce[12] = { 0 };
/* Check for a valid RNG lock. */
PORT_Assert(rng_lock != NULL);
if (rng_lock == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
/* --- LOCKED --- */
PZ_Lock(rng_lock);
memcpy(nonce, &globalNumCalls, sizeof(globalNumCalls));
globalNumCalls++;
ChaCha20Poly1305Context *cx =
ChaCha20Poly1305_CreateContext(key, sizeof(key), 16);
if (!cx) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
PZ_Unlock(rng_lock);
return SECFailure;
}
memset(dest, 0, len);
ChaCha20XOR(dest, dest, len, key, nonce, 0);
ChaCha20Poly1305_DestroyContext(cx, PR_TRUE);
PZ_Unlock(rng_lock);
/* --- UNLOCKED --- */
return SECSuccess;
}
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