PKI: Add support for signature_bits param to the intermediate/generate api #17388
+131
−84
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Mainly to work properly with GCP backed managed keys, we need to issue signatures that would match the GCP key algorithm.
At this time due to crypto/x509: can't verify signature on RSA-PSS certificate requests it created golang/go#45990 we can't issue PSS signed CSRs, as the libraries in Go always request a PKCS1v15.
Add an extra check in intermediate/generate that validates the CSR's signature before providing it back to the client in case we generated a bad signature such as if an end-user used a GCP backed managed key with a RSA PSS algorithm.