72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
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/* Copyright (c) 2014, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <openssl/rand.h>
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#include <openssl/thread.h>
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#if defined(OPENSSL_WINDOWS)
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#include <stdlib.h>
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#include <Windows.h>
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#include <Wincrypt.h>
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static char global_provider_init;
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static HCRYPTPROV global_provider;
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void RAND_cleanup(void) {
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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CryptReleaseContext(global_provider, 0);
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global_provider_init = 0;
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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}
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int RAND_bytes(uint8_t *out, size_t requested) {
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HCRYPTPROV provider = 0;
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int ok;
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CRYPTO_r_lock(CRYPTO_LOCK_RAND);
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if (!global_provider_init) {
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CRYPTO_r_unlock(CRYPTO_LOCK_RAND);
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CRYPTO_w_lock(CRYPTO_LOCK_RAND);
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if (!global_provider_init) {
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if (CryptAcquireContext(&global_provider, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
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global_provider_init = 1;
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}
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}
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CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
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CRYPTO_r_lock(CRYPTO_LOCK_RAND);
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}
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ok = global_provider_init;
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provider = global_provider;
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CRYPTO_r_unlock(CRYPTO_LOCK_RAND);
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if (!ok) {
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abort();
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return ok;
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}
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if (TRUE != CryptGenRandom(provider, requested, out)) {
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abort();
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return 0;
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}
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return 1;
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}
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#endif /* OPENSSL_WINDOWS */
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