Fix HPKE/KEM exact-length key unmarshaling#627
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Reject oversized public and private key buffers instead of silently truncating, preventing slice-bounds panics in HPKE. Fixes cloudflare#488.
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Summary
shortKEMandxKEMUnmarshalBinaryPublicKey/UnmarshalBinaryPrivateKeyinstead of accepting oversized inputs that were silently truncatedkem.ErrPubKeySize/kem.ErrPrivKeySizeon length mismatchhpke/kem_test.goand extendkem/schemes/schemes_test.gowithTestExactLengthUnmarshalacross all registered KEM schemesTest plan
go test ./hpke/... ./kem/schemes/...Fixes #488