derive CA from pre-shared key #3815
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Summary
Creates new certificate authority using a pre-shared key. This certificate authority is generated on the fly and would yield the same private key every time for the given PSK.
This PR creates an utility package
pkg/derivecertthat allows services that have a certain pre-shared key (i.e. Pomeriumshared_secret) to get automatic TLS without need to share and distribute certs, and provides a better alternative to plaintext (or with disabled TLS cert chain validation) communication, but is not intended to be a replacement for proper mTLS setup.Certs are intentionally created with very large validity, so that services that start (or restart) would be able to trust them.
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improvement/bug/ etc)