mirror of https://gogs.blitter.com/RLabs/xs
61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
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// Copyright (c) 2016 Andreas Auernhammer. All rights reserved.
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// Use of this source code is governed by a license that can be
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// found in the LICENSE file.
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// +build 386,!gccgo,!appengine,!nacl
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package chacha
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import (
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"encoding/binary"
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"golang.org/x/sys/cpu"
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)
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func init() {
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useSSE2 = cpu.X86.HasSSE2
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useSSSE3 = cpu.X86.HasSSSE3
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useAVX = false
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useAVX2 = false
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}
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func initialize(state *[64]byte, key []byte, nonce *[16]byte) {
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binary.LittleEndian.PutUint32(state[0:], sigma[0])
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binary.LittleEndian.PutUint32(state[4:], sigma[1])
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binary.LittleEndian.PutUint32(state[8:], sigma[2])
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binary.LittleEndian.PutUint32(state[12:], sigma[3])
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copy(state[16:], key[:])
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copy(state[48:], nonce[:])
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}
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// This function is implemented in chacha_386.s
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//go:noescape
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func hChaCha20SSE2(out *[32]byte, nonce *[16]byte, key *[32]byte)
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// This function is implemented in chacha_386.s
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//go:noescape
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func hChaCha20SSSE3(out *[32]byte, nonce *[16]byte, key *[32]byte)
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// This function is implemented in chacha_386.s
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//go:noescape
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func xorKeyStreamSSE2(dst, src []byte, block, state *[64]byte, rounds int) int
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func hChaCha20(out *[32]byte, nonce *[16]byte, key *[32]byte) {
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switch {
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case useSSSE3:
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hChaCha20SSSE3(out, nonce, key)
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case useSSE2:
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hChaCha20SSE2(out, nonce, key)
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default:
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hChaCha20Generic(out, nonce, key)
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}
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}
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func xorKeyStream(dst, src []byte, block, state *[64]byte, rounds int) int {
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if useSSE2 {
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return xorKeyStreamSSE2(dst, src, block, state, rounds)
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} else {
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return xorKeyStreamGeneric(dst, src, block, state, rounds)
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}
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}
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