mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-12-27 11:15:39 +00:00
59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
// 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 amd64,!gccgo,!appengine
|
|
|
|
package poly1305
|
|
|
|
//go:noescape
|
|
func update(state *macState, msg []byte)
|
|
|
|
func sum(out *[16]byte, m []byte, key *[32]byte) {
|
|
h := newMAC(key)
|
|
h.Write(m)
|
|
h.Sum(out)
|
|
}
|
|
|
|
func newMAC(key *[32]byte) (h mac) {
|
|
initialize(key, &h.r, &h.s)
|
|
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 }
|
|
|
|
func (h *mac) Write(p []byte) (int, error) {
|
|
nn := len(p)
|
|
if h.offset > 0 {
|
|
n := copy(h.buffer[h.offset:], p)
|
|
if h.offset+n < TagSize {
|
|
h.offset += n
|
|
return nn, nil
|
|
}
|
|
p = p[n:]
|
|
h.offset = 0
|
|
update(&h.macState, h.buffer[:])
|
|
}
|
|
if n := len(p) - (len(p) % TagSize); n > 0 {
|
|
update(&h.macState, p[:n])
|
|
p = p[n:]
|
|
}
|
|
if len(p) > 0 {
|
|
h.offset += copy(h.buffer[h.offset:], p)
|
|
}
|
|
return nn, nil
|
|
}
|
|
|
|
func (h *mac) Sum(out *[16]byte) {
|
|
state := h.macState
|
|
if h.offset > 0 {
|
|
update(&state, h.buffer[:h.offset])
|
|
}
|
|
finalize(out, &state.h, &state.s)
|
|
}
|