Crate challenge 

Reusable helpers for the challenge ALTCHA CLI.

The binary in src/main.rs is intentionally thin; most validation and JSON shaping lives here so it can be unit-tested without spawning the CLI.

Structs

CreateConfig

Runtime options used to create an ALTCHA challenge.

SolveConfig

Runtime options used to solve an ALTCHA challenge.

VerifyOutput

Stable JSON output for challenge verify and challenge verify-payload.

VerifyServerOutput

Stable JSON output for challenge verify-server.

Functions

create

Create a challenge from a validated config.

parse_data_args

Parse repeated --data key=value flags into signed challenge metadata.

parse_server_payload

Decode an ALTCHA Sentinel payload from JSON or base64-encoded JSON.

print_json

Print any serializable value as pretty or compact JSON.

read_input

Read a UTF-8 input file or stdin when path is -.

read_json

Read and deserialize a JSON file or stdin when path is -.

solve

Solve a challenge. Returns an error when the configured timeout elapses.

unix_now

Return Unix time in seconds.

verify_pair

Verify a submitted solution against the original challenge.

verify_register_payload

Verify a /register request body containing either:

verify_server_payload

Verify an ALTCHA Sentinel server-signature payload.