Release v0.3.0

vendor/github.com/aead/chacha20/chacha/chacha_386.go

@@ -0,0 +1,60 @@
+// 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)
+	}
+}