[Webkit-unassigned] [Bug 207174] Add WebCrypto LayoutTests to check if PKCS#7 padding is correctly implemented in AES-CBC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207174

--- Comment #4 from Tomoki Imai <tomoki.imai at sony.com> ---
(In reply to Tomoki Imai from comment #3)

> Actually we had a bug in calculating the encrypted data length when the
> length % 8 == 0, and the case was not covered by the current LayoutTest. bug
> 207176

Correction: length % 16 == 0.
When the length % 16 == 0, we need to add 16 bytes for padding, but our first implementation didn't add any padding, but passed all the LayoutTest.
https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS%235_and_PKCS%237

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