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hpke: relax seed size check in DeriveKeyPair #487

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hpke: relax seed size check in DeriveKeyPair #487

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Commits on Mar 13, 2024

  1. hpke: relax seed size check in DeriveKeyPair 

    RFC 9180 section 7.1.3 says:

> For a given KEM, the ikm parameter given to DeriveKeyPair()
> SHOULD have length at least Nsk, and SHOULD have at least Nsk
> bytes of entropy.

Thus, it is not a requirement for HPKE to pass a seed with a fixed
size. Protocols such as MLS rely on this.

Closes: cloudflare#486
    @emersion
    emersion committed Mar 13, 2024
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