Verify a downloaded submission's integrity hash — verify

Checks a JSON file downloaded via download_answers_button() against its embedded SHA-256 hash, to detect whether it was edited after being downloaded (e.g. a wrong answer quietly changed to a right one before being turned in). This is tamper-evidence, not proof of identity: the hash is computed entirely in the reader's own browser with no server-held secret, so a technical reader could in principle reproduce it themselves – this is a deterrent and a check against casual editing, not real cryptographic security.

Usage

verify_submission(path)

Arguments

path: Path to a JSON file downloaded via download_answers_button().

Value

Invisibly, a list with ok (logical) and the parsed submission content. Also prints a human-readable summary.

Examples

if (FALSE) { # \dontrun{
verify_submission("class-101-2026-01-15T12-00-00-000Z.json")
} # }