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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 <assert.h>
- #include <stdlib.h>
- #include <string.h>
-
- #include <openssl/cpu.h>
-
-
- #if defined(OPENSSL_X86_64) && !defined(OPENSSL_NO_ASM)
-
- int CRYPTO_have_hwrand(void) {
- return (OPENSSL_ia32cap_P[1] & (1u << 30)) != 0;
- }
-
- /* These functions are defined in asm/rdrand-x86_64.pl */
- extern int CRYPTO_rdrand(uint8_t out[8]);
- extern int CRYPTO_rdrand_multiple8_buf(uint8_t *buf, size_t len);
-
- int CRYPTO_hwrand(uint8_t *buf, size_t len) {
- const size_t len_multiple8 = len & ~7;
- if (!CRYPTO_rdrand_multiple8_buf(buf, len_multiple8)) {
- return 0;
- }
- len -= len_multiple8;
-
- if (len != 0) {
- assert(len < 8);
-
- uint8_t rand_buf[8];
- if (!CRYPTO_rdrand(rand_buf)) {
- return 0;
- }
- memcpy(buf + len_multiple8, rand_buf, len);
- }
-
- return 1;
- }
-
- #else
-
- int CRYPTO_have_hwrand(void) {
- return 0;
- }
-
- void CRYPTO_hwrand(uint8_t *buf, size_t len) {
- abort();
- }
-
- #endif
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