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35 lines
912 B
Go
35 lines
912 B
Go
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package smtp
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import (
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"crypto/hmac"
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"crypto/md5"
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"fmt"
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)
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// cramMD5Auth is the type that satisfies the Auth interface for the "SMTP CRAM_MD5" auth
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type cramMD5Auth struct {
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username, secret string
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}
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// CRAMMD5Auth returns an Auth that implements the CRAM-MD5 authentication
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// mechanism as defined in RFC 2195.
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// The returned Auth uses the given username and secret to authenticate
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// to the server using the challenge-response mechanism.
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func CRAMMD5Auth(username, secret string) Auth {
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return &cramMD5Auth{username, secret}
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}
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func (a *cramMD5Auth) Start(server *ServerInfo) (string, []byte, error) {
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return "CRAM-MD5", nil, nil
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}
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func (a *cramMD5Auth) Next(fromServer []byte, more bool) ([]byte, error) {
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if more {
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d := hmac.New(md5.New, []byte(a.secret))
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d.Write(fromServer)
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s := make([]byte, 0, d.Size())
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return fmt.Appendf(nil, "%s %x", a.username, d.Sum(s)), nil
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}
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return nil, nil
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}
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