mirror of https://gogs.blitter.com/RLabs/xs
89 lines
2.4 KiB
Go
89 lines
2.4 KiB
Go
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// Copryright (C) 2019 Yawning Angel
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// +build amd64,!noasm
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package hardware
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import (
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"golang.org/x/sys/cpu"
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"blitter.com/go/chacha20/internal/api"
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)
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//go:noescape
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func blocksAVX2(s *[api.StateSize]uint32, in, out []byte)
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//go:noescape
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func hChaChaAVX2(key, nonce []byte, dst *byte)
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//go:noescape
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func blocksSSSE3(s *[api.StateSize]uint32, in, out []byte)
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//go:noescape
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func hChaChaSSSE3(key, nonce []byte, dst *byte)
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type implAmd64 struct {
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name string
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blocksFn func(*[api.StateSize]uint32, []byte, []byte, int)
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hChaChaFn func([]byte, []byte, *byte)
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}
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func (impl *implAmd64) Name() string {
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return impl.name
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}
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func (impl *implAmd64) Blocks(x *[api.StateSize]uint32, dst, src []byte, nrBlocks int) {
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impl.blocksFn(x, dst, src, nrBlocks)
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}
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func (impl *implAmd64) HChaCha(key, nonce []byte, dst []byte) {
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impl.hChaChaFn(key, nonce, &dst[0])
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}
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func blockWrapper(fn func(*[api.StateSize]uint32, []byte, []byte)) func(*[api.StateSize]uint32, []byte, []byte, int) {
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return func(x *[api.StateSize]uint32, dst, src []byte, nrBlocks int) {
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sz := nrBlocks * api.BlockSize
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if src != nil {
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fn(x, src[:sz], dst[:sz])
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} else {
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// Sub-optimal, but the compiler special cases this to an assembly
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// optimized runtime.memclrNoHeapPointers, so it's not terrible.
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for i := range dst[:sz] {
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dst[i] = 0
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}
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fn(x, dst[:sz], dst[:sz])
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}
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}
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}
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func init() {
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if cpu.X86.HasAVX2 {
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hardwareImpls = append(hardwareImpls, &implAmd64{
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name: "amd64_avx2",
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blocksFn: blockWrapper(blocksAVX2),
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hChaChaFn: hChaChaAVX2,
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})
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}
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if cpu.X86.HasSSE3 {
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hardwareImpls = append(hardwareImpls, &implAmd64{
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name: "amd64_ssse3",
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blocksFn: blockWrapper(blocksSSSE3),
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hChaChaFn: hChaChaSSSE3,
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})
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}
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}
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