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synced 2026-06-19 21:49:14 -04:00
a3ed55ff18
Following jrtc27@'s fix of the transcribed code, it seems to work
fine now.
See also: 207f3b2b25
77 lines
3.1 KiB
C
77 lines
3.1 KiB
C
/*-
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* Copyright (c) 2016 The Go Authors. All rights reserved.
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* Copyright (c) 2024 Robert Clausecker <fuz@freebsd.org>
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*
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* Adapted from Go's crypto/sha1/sha1block_amd64.go.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/specialreg.h>
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#include <sha.h>
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#include <x86/ifunc.h>
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extern void _libmd_sha1block_scalar(SHA1_CTX *, const void *, size_t);
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extern void _libmd_sha1block_avx2(SHA1_CTX *, const void *, size_t);
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extern void _libmd_sha1block_shani(SHA1_CTX *, const void *, size_t);
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static void sha1block_avx2_wrapper(SHA1_CTX *, const void *, size_t);
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#define AVX2_STDEXT_NEEDED \
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(CPUID_STDEXT_BMI1 | CPUID_STDEXT_AVX2 | CPUID_STDEXT_BMI2)
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DEFINE_UIFUNC(, void, sha1_block, (SHA1_CTX *, const void *, size_t))
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{
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if (cpu_stdext_feature & CPUID_STDEXT_SHA)
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return (_libmd_sha1block_shani);
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if ((cpu_stdext_feature & AVX2_STDEXT_NEEDED) == AVX2_STDEXT_NEEDED)
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return (sha1block_avx2_wrapper);
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else
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return (_libmd_sha1block_scalar);
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}
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static void
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sha1block_avx2_wrapper(SHA1_CTX *c, const void *data, size_t len)
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{
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if (len >= 256) {
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/*
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* sha1block_avx2 calculates sha1 for 2 block per iteration.
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* It also interleaves the precalculation for next the block.
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* So it may read up-to 192 bytes past the end of p.
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* We may add checks inside sha1block_avx2, but this will
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* just turn it into a copy of sha1block_scalar,
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* so call it directly, instead.
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*/
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size_t safe_len = len - 128;
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if (safe_len % 128 != 0)
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safe_len -= 64;
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_libmd_sha1block_avx2(c, data, safe_len);
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_libmd_sha1block_scalar(c, data + safe_len, len - safe_len);
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} else
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_libmd_sha1block_scalar(c, data, len);
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}
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