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/*-
* Copyright (c) 2016 The Go Authors. All rights reserved.
* Copyright (c) 2024 Robert Clausecker <fuz@FreeBSD.org>
*
* Adapted from Go's crypto/sha1/sha1block_amd64.go.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/specialreg.h>
#include <sha.h>
#include <x86/ifunc.h>
extern void _libmd_sha1block_scalar(SHA1_CTX *, const void *, size_t);
extern void _libmd_sha1block_avx2(SHA1_CTX *, const void *, size_t);
extern void _libmd_sha1block_shani(SHA1_CTX *, const void *, size_t);
static void sha1block_avx2_wrapper(SHA1_CTX *, const void *, size_t);
#define AVX2_STDEXT_NEEDED \
(CPUID_STDEXT_BMI1 | CPUID_STDEXT_AVX2 | CPUID_STDEXT_BMI2)
DEFINE_UIFUNC(, void, sha1_block, (SHA1_CTX *, const void *, size_t))
{
if (cpu_stdext_feature & CPUID_STDEXT_SHA)
return (_libmd_sha1block_shani);
if ((cpu_stdext_feature & AVX2_STDEXT_NEEDED) == AVX2_STDEXT_NEEDED)
return (sha1block_avx2_wrapper);
else
return (_libmd_sha1block_scalar);
}
static void
sha1block_avx2_wrapper(SHA1_CTX *c, const void *data, size_t len)
{
if (len >= 256) {
/*
* sha1block_avx2 calculates sha1 for 2 block per iteration.
* It also interleaves the precalculation for next the block.
* So it may read up-to 192 bytes past the end of p.
* We may add checks inside sha1block_avx2, but this will
* just turn it into a copy of sha1block_scalar,
* so call it directly, instead.
*/
size_t safe_len = len - 128;
if (safe_len % 128 != 0)
safe_len -= 64;
_libmd_sha1block_avx2(c, data, safe_len);
_libmd_sha1block_scalar(c, data + safe_len, len - safe_len);
} else
_libmd_sha1block_scalar(c, data, len);
}
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