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