webcrypto: Throw exception on `saltLength: 0` for RSA PSS sign/verify
#4265 aperta il 30 ott 2024
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Descrizione
What?
While implementing support of RSA grafana/xk6-webcrypto#85 we've found that standard Golang's SDK doesn't provide support of the saltLength: 0, instead it always tries to generate salt with the maximum length.
This led us for the patch to WebPlatfrom tests: https://github.com/grafana/xk6-webcrypto/blob/main/webcrypto/tests/wpt-patches/WebCryptoAPI__sign_verify__rsa.js.patch
Since some use cases could actually try to use the lengths of salt 0 we need to issue a log warning user that the actual behavior of our implementation is different.
edit(@mstoykov): After some discussion the idea is currently to throw an exception instead of just log a warning.
Why?
It improves UX and makes implementation predictable.