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- /* Copyright (c) 2015, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #include <openssl/rand.h>
-
- #include <stdlib.h>
- #include <string.h>
-
- #include <openssl/cpu.h>
-
-
- #if defined(OPENSSL_X86_64)
-
- int CRYPTO_have_hwrand(void) {
- return (OPENSSL_ia32cap_P[1] & (1u << 30)) != 0;
- }
-
- /* CRYPTO_rdrand is defined in asm/rdrand-x86_64.pl */
- extern uint64_t CRYPTO_rdrand(void);
-
- void CRYPTO_hwrand(uint8_t *buf, size_t len) {
- while (len >= 8) {
- uint64_t rand = CRYPTO_rdrand();
- memcpy(buf, &rand, sizeof(rand));
- len -= sizeof(rand);
- buf += sizeof(rand);
- }
-
- if (len > 0) {
- uint64_t rand = CRYPTO_rdrand();
- memcpy(buf, &rand, len);
- }
- }
-
- #else
-
- int CRYPTO_have_hwrand(void) {
- return 0;
- }
-
- void CRYPTO_hwrand(uint8_t *buf, size_t len) {
- abort();
- }
-
- #endif
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