[Webkit-unassigned] [Bug 165835] New: Handle key generation with empty challenge string

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165835

            Bug ID: 165835
           Summary: Handle key generation with empty challenge string
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wilander at apple.com

https://bugs.webkit.org/show_bug.cgi?id=160945 introduced an ASSERT(challenge.data()) that didn't catch empty challenge strings. Also, empty challenge strings are allowed:

"If the element has a challenge attribute, then let challenge be that attribute's value. Otherwise, let challenge be the empty string."
https://www.w3.org/TR/html5/forms.html#the-keygen-element

Email certificate generation at https://www.comodo.com/home/email-security/free-email-certificate.php broke because of https://bugs.webkit.org/show_bug.cgi?id=160945.

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