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