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