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Notation Blob Verification
Option 1 (Preferred as disccussed)
The idea here was that in
BlobVerifier
implementation we will compare the descriptor returned byBlobDescriptorGenerator
with the descriptor in the signature. However, this approach doesn't work because we cannot create the correct descriptor from the blob (io.reader
) since we don't know the blob's media type and user defined metadata. The blob media type and user metadata are optional parameters in Notation, and users can choose not to pass them during verification.Selectively comparing descriptor fields is not accurate because the BlobVerifier's
VerifyBlob
method gives the impression that we are comparing the complete descriptor.Option 2
The idea here is that
BlobVerifier
implementation will calculate hash out of blob and compare the hash with the hash stored in signature descriptor. And yes, we will also support comparing on mediatype and user defined metata if user choose to pass them in verify command.Option 3 (by Patrick)
An improvement based on option 1. Added TrustPolicyName field to BlobVerifierVerifyOptions.