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… (читать ещё)

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.

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