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module Mail
module Gpg
class SignPart < Mail::Part
def initialize(cleartext_mail, options = {})
signature = GpgmeHelper.sign(cleartext_mail.encoded, options)
super() do
body signature.to_s
content_type "application/pgp-signature; name=\"signature.asc\""
content_disposition 'attachment; filename="signature.asc"'
content_description 'OpenPGP digital signature'
end
end
# true if all signatures are valid
def self.signature_valid?(plain_part, signature_part, options = {})
verify_signature(plain_part, signature_part, options)[0]
end
# will return [success(boolean), verify_result(as returned by gpgme)]
def self.verify_signature(plain_part, signature_part, options = {})
if !(signature_part.has_content_type? &&
('application/pgp-signature' == signature_part.mime_type))
return false
end
signature = signature_part.body.encoded
GpgmeHelper.sign_verify(plain_part.encoded, signature, options)
end
end
end
end
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