Replace struct SignEnclaveInfo with trait PcrSigner
#30
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Issue #, if available:
Description of changes:
This PR is required by aws-nitro-enclaves-cli/pull/639
Replacing
struct SignEnclaveInfowithtrait PcrSignerallows us to support new signing methods by extendingtrait PcrSignerwithout changing the existing code.Add
struct PrivateKeyPcrSignerfor signingPcrInfowithPrivateKeyAdd
fn get_measurements,struct PcrCoseSign1andstruct SignaturePcrSigner. For security reasons, the private key is usually in a separated environment, so it may not be possible to build an enclave with private key in a single step from the building pipeline. Inspired by Digest Signing in oesign,fn get_measurementsis used to generate measurements without writing output enclave image file.struct PcrCoseSign1is exported to public and provide function to signPcrInfostruct SignaturePcrSigneris used to accept the signature, verify it, and directly write it to the enclave image file.By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.