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gitea/vendor/golang.org/x/crypto/poly1305/sum_amd64.go

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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build !gccgo,!purego
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package poly1305
//go:noescape
func update(state *macState, msg []byte)
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func sum(out *[16]byte, m []byte, key *[32]byte) {
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h := newMAC(key)
h.Write(m)
h.Sum(out)
}
func newMAC(key *[32]byte) (h mac) {
initialize(key, &h.r, &h.s)
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return
}
// mac is a wrapper for macGeneric that redirects calls that would have gone to
// updateGeneric to update.
//
// Its Write and Sum methods are otherwise identical to the macGeneric ones, but
// using function pointers would carry a major performance cost.
type mac struct{ macGeneric }
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func (h *mac) Write(p []byte) (int, error) {
nn := len(p)
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if h.offset > 0 {
n := copy(h.buffer[h.offset:], p)
if h.offset+n < TagSize {
h.offset += n
return nn, nil
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}
p = p[n:]
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h.offset = 0
update(&h.macState, h.buffer[:])
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}
if n := len(p) - (len(p) % TagSize); n > 0 {
update(&h.macState, p[:n])
p = p[n:]
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}
if len(p) > 0 {
h.offset += copy(h.buffer[h.offset:], p)
}
return nn, nil
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}
func (h *mac) Sum(out *[16]byte) {
state := h.macState
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if h.offset > 0 {
update(&state, h.buffer[:h.offset])
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}
finalize(out, &state.h, &state.s)
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}