mirror of
https://github.com/wneessen/go-mail.git
synced 2024-09-19 18:52:47 +02:00
Winni Neessen
8559e8c301
The following changes make use of methods that are not available in Go 1.17/Go 1.18. To guarantee at least 4 versions of backwards compatibility, versioned copies of those changes have been back-ported: -4d8db00641 (diff-4f6f6bdb9891d4dd271f9f31430420a2e44018fe4ee539576faf458bebb3cee4)-58158e990f (diff-772fc9f5d0c86f26e35158fb3e7a71a4967d18b4ec23a5dbb60781ab0babf426)
50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
// SPDX-FileCopyrightText: Copyright 2010 The Go Authors. All rights reserved.
|
|
// SPDX-FileCopyrightText: Copyright (c) 2022-2023 The go-mail Authors
|
|
//
|
|
// Original net/smtp code from the Go stdlib by the Go Authors.
|
|
// Use of this source code is governed by a BSD-style
|
|
// LICENSE file that can be found in this directory.
|
|
//
|
|
// go-mail specific modifications by the go-mail Authors.
|
|
// Licensed under the MIT License.
|
|
// See [PROJECT ROOT]/LICENSES directory for more information.
|
|
//
|
|
// SPDX-License-Identifier: BSD-3-Clause AND MIT
|
|
|
|
//go:build go1.19
|
|
// +build go1.19
|
|
|
|
package smtp
|
|
|
|
import (
|
|
"crypto/hmac"
|
|
"crypto/md5"
|
|
"fmt"
|
|
)
|
|
|
|
// cramMD5Auth is the type that satisfies the Auth interface for the "SMTP CRAM_MD5" auth
|
|
type cramMD5Auth struct {
|
|
username, secret string
|
|
}
|
|
|
|
// CRAMMD5Auth returns an Auth that implements the CRAM-MD5 authentication
|
|
// mechanism as defined in RFC 2195.
|
|
// The returned Auth uses the given username and secret to authenticate
|
|
// to the server using the challenge-response mechanism.
|
|
func CRAMMD5Auth(username, secret string) Auth {
|
|
return &cramMD5Auth{username, secret}
|
|
}
|
|
|
|
func (a *cramMD5Auth) Start(_ *ServerInfo) (string, []byte, error) {
|
|
return "CRAM-MD5", nil, nil
|
|
}
|
|
|
|
func (a *cramMD5Auth) Next(fromServer []byte, more bool) ([]byte, error) {
|
|
if more {
|
|
d := hmac.New(md5.New, []byte(a.secret))
|
|
d.Write(fromServer)
|
|
s := make([]byte, 0, d.Size())
|
|
return fmt.Appendf(nil, "%s %x", a.username, d.Sum(s)), nil
|
|
}
|
|
return nil, nil
|
|
}
|