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rdrand.c
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/*
* Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
*
* http://www.apache.org/licenses/LICENSE-2.0
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <gmssl/error.h>
#include <immintrin.h>
int rdrand_bytes(uint8_t *buf, size_t buflen)
{
unsigned long long val;
uint8_t *p = (uint8_t *)&val;
while (buflen) {
size_t len = buflen >= sizeof(val) ? sizeof(val) : buflen;
if (_rdrand64_step(&val) != 1) {
error_print();
return -1;
}
memcpy(buf, p, len);
buf += len;
buflen -= len;
}
return 1;
}
int rdseed_bytes(uint8_t *buf, size_t buflen)
{
unsigned long long val;
uint8_t *p = (uint8_t *)&val;
while (buflen) {
size_t len = buflen >= sizeof(val) ? sizeof(val) : buflen;
if (_rdseed64_step(&val) != 1) {
error_print();
return -1;
}
memcpy(buf, p, len);
buf += len;
buflen -= len;
}
return 1;
}