validator: reject multi-sig JWS to ensure alg check matches verified signature #343
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…signature Signed-off-by: Joshua Rogers <MegaManSec@users.noreply.github.com>
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This is a no-brainer patch that disallows multiple keys, of which one may contain a disallowed Algorithm (which will pass the
validateSigningMethodcall), from being validated. JSON serialization can carry multiple signatures with different headers/algorithms, which this validator does not intend to support.