1// Copyright 2012 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// +build amd64,!gccgo,!appengine
6
7package poly1305
8
9// This function is implemented in sum_amd64.s
10//go:noescape
11func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
12
13// Sum generates an authenticator for m using a one-time key and puts the
14// 16-byte result into out. Authenticating two different messages with the same
15// key allows an attacker to forge messages at will.
16func Sum(out *[16]byte, m []byte, key *[32]byte) {
17	var mPtr *byte
18	if len(m) > 0 {
19		mPtr = &m[0]
20	}
21	poly1305(out, mPtr, uint64(len(m)), key)
22}
23