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/* $OpenBSD: crypto_cpu_caps.c,v 1.2 2024/11/12 13:52:31 jsing Exp $ */
/*
* Copyright (c) 2025 Brent Cook <bcook@openbsd.org>
*
* Permission to use, copy, modify, and 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 <sys/sysctl.h>
#include "crypto_arch.h"
/* Machine dependent CPU capabilities. */
uint64_t crypto_cpu_caps_aarch64;
static uint64_t
check_cpu_cap(const char *cap_name, uint64_t cap_flag)
{
int has_cap = 0;
size_t len = sizeof(has_cap);
sysctlbyname(cap_name, &has_cap, &len, NULL, 0);
return has_cap ? cap_flag : 0;
}
void
crypto_cpu_caps_init(void)
{
crypto_cpu_caps_aarch64 = 0;
/* from https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics#3918855 */
crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_AES",
CRYPTO_CPU_CAPS_AARCH64_AES);
crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_PMULL",
CRYPTO_CPU_CAPS_AARCH64_PMULL);
crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA1",
CRYPTO_CPU_CAPS_AARCH64_SHA1);
crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA256",
CRYPTO_CPU_CAPS_AARCH64_SHA2);
crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA512",
CRYPTO_CPU_CAPS_AARCH64_SHA512);
crypto_cpu_caps_aarch64 |= check_cpu_cap("hw.optional.arm.FEAT_SHA3",
CRYPTO_CPU_CAPS_AARCH64_SHA3);
}
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