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 poly1305_amd64.s
10
11//go:noescape
12
13func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]byte)
14
15// Sum generates an authenticator for m using a one-time key and puts the
16// 16-byte result into out. Authenticating two different messages with the same
17// key allows an attacker to forge messages at will.
18func Sum(out *[16]byte, m []byte, key *[32]byte) {
19	var mPtr *byte
20	if len(m) > 0 {
21		mPtr = &m[0]
22	}
23	poly1305(out, mPtr, uint64(len(m)), key)
24}
25