fix(webauthn): accept PRF evalByCredential JSON key#277
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…er-credential salts The per-credential member deserialized as eval_by_credential instead of the spec name evalByCredential, so conformant JSON callers lost their per-credential salts and the spec validations never ran. Rename it via camelCase, and validate every key in prf_to_hmac_input so a later empty or non-base64url key is still rejected.
AlfioEmanueleFresta
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JSON callers scope PRF salts per credential under the member name evalByCredential, but the deserializer only accepted a snake_case key, so the per-credential map was dropped before it could be used. This accepts the spec member name so those salts reach the assertion request.
Closes #251.