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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) && !defined(OPENSSL_NO_ASM)
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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