[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 #3 from Tomoki Imai <tomoki.imai at sony.com> ---
(In reply to Jiewen Tan from comment #2)
> Not sure why this is needed? You have to implement PKCS#7 yourself?

I think we need this to validate all the padding is done as expected, and our usage of underlying libraries like CommonCrypt, GCrypt, OpenSSL are correct.

For OpenSSL backend, we don't have to implement PKCS#7 by ourselves, but we need to setup enough memory for encrypted/decrypted data, which may contains PKCS#7 padding.

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

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