crypto-common: add KeyExport trait
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newpavlov
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Please do not forget to update the changelog.
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Adds a companion trait to `KeyInit*` for exporting a key to a byte array sized according to `KeySizeUser`. This is needed when generating e.g. asymmetric secret keys types using the `Generate` trait and it returns an actual key type (e.g. `SigningKey`, `DecryptionKey`, `DecapsulationKey`) as opposed to its serialized byte representation.
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Adds a companion trait to
KeyInit*for exporting a key to a byte array sized according toKeySizeUser.This is needed when generating e.g. asymmetric secret keys types using the
Generatetrait and it returns an actual key type (e.g.SigningKey,DecryptionKey,DecapsulationKey) as opposed to its serialized byte representation.This PR also shows another use case for it: there's currently a gap in the
kemcrate around serialization where you can generically go fromDecapsulate::encapsulatorto the associated encapsulation key for a KEM, but there is currently no generic way to serialize it.It adds
TryKeyInitandKeyExportbounds tokem::Encapsulate, because as the public key component we should always be able to serialize/deserialize it.(NOTE: happy to split the
kemchanges out, that would probably be for the best, but I thought it would help illustrate the use case)