Fix proof-purpose selection to scan all presentation proofs. - #10
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Signed-off-by: Dmitri Zagidulin <dzagidulin@gmail.com>
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Presentation verification now derives the proof purpose by scanning every
proof in the proof set instead of reading
proof[0]alone. A presentationcarrying an
assertionMethodproof ahead of itsauthenticationproof wasverified under
AssertionProofPurpose, which skips non-matching proofs andaggregates with "any verified" -- so the authentication proof binding the
response to the request's challenge and domain was never signature-checked.
If any proof declares
authentication(orauthenticationMethod),AuthenticationProofPurposeis used.