OpenPGP breaks for newline in html-formatted signature
Environment: Thunderbird for Android: 24.0 OpenKeychain: 6.0.4 (60400) Android Version: 17 Andorid Build: CP3A.261005.002.A1 When sending a PGP/MIME-signed message from T… (lees meer)
Environment:
Thunderbird for Android: 24.0 OpenKeychain: 6.0.4 (60400) Android Version: 17 Andorid Build: CP3A.261005.002.A1
When sending a PGP/MIME-signed message from Thunderbird for Android, the OpenPGP signature becomes invalid when an HTML-formatted signature contains markup that enforces line breaks.
A plain newline in the HTML source does not create a visible line break, as expected because HTML collapses whitespace.
However, adding any of the following causes the signature to become invalid:
The first and second are used to create a normal line break and the third is used to create an empty spacing line.
Inline HTML formatting, such as or <a>, does not cause the problem.
Expected result:
HTML line-break elements should be included in the content covered by the OpenPGP signature, and the signature should remain valid.
Actual result:
The message is sent successfully, but the received OpenPGP signature cannot be verified whenever the HTML signature contains markup for a line break or empty spacing line.
The issue does not occur when the signature contains only text and inline formatting. Raw .eml samples can be provided if needed.