9
// Sign creates a SMIMEA record from an SSL certificate.
10
func (r *SMIMEA) Sign(usage, selector, matchingType int, cert *x509.Certificate) (err error) {
11
r.Hdr.Rrtype = TypeSMIMEA
12
r.Usage = uint8(usage)
13
r.Selector = uint8(selector)
14
r.MatchingType = uint8(matchingType)
16
r.Certificate, err = CertificateToDANE(r.Selector, r.MatchingType, cert)
23
// Verify verifies a SMIMEA record against an SSL certificate. If it is OK
24
// a nil error is returned.
25
func (r *SMIMEA) Verify(cert *x509.Certificate) error {
26
c, err := CertificateToDANE(r.Selector, r.MatchingType, cert)
28
return err // Not also ErrSig?
30
if r.Certificate == c {
33
return ErrSig // ErrSig, really?
36
// SIMEAName returns the ownername of a SMIMEA resource record as per the
37
// format specified in RFC 'draft-ietf-dane-smime-12' Section 2 and 3
38
func SMIMEAName(email_address string, domain_name string) (string, error) {
39
hasher := sha256.New()
40
hasher.Write([]byte(email_address))
42
// RFC Section 3: "The local-part is hashed using the SHA2-256
43
// algorithm with the hash truncated to 28 octets and
44
// represented in its hexadecimal representation to become the
45
// left-most label in the prepared domain name"
46
return hex.EncodeToString(hasher.Sum(nil)[:28]) + "." + "_smimecert." + domain_name, nil