Password Pwned Check

version: "0.1"
name: password-pwned-check
description: |
  Privacy-preserving password compromise check. Computes SHA-1 of a password locally,
  sends only the first 5 hex characters to the free Pwned Passwords range API, and
  returns a boolean plus exposure count if matched.
inputs:
  - name: password_sha1
    type: string
    required: true
    description: Uppercase SHA-1 of the candidate password.
    pattern: "^[A-F0-9]{40}$"
  - name: padding
    type: boolean
    default: true
local_steps:
  - id: split-hash
    expression:
      prefix: "{{ password_sha1[0:5] }}"
      suffix: "{{ password_sha1[5:40] }}"
steps:
  - id: range-lookup
    capability: pwned-passwords.range
    with:
      hashPrefix: "{{ steps.split-hash.prefix }}"
    headers:
      Add-Padding: "{{ padding }}"
post_process:
  - id: parse-matches
    expression: |
      parse_range_response(
        response: steps.range-lookup.body,
        suffix: steps.split-hash.suffix
      )
outputs:
  - name: pwned
    value: "{{ steps.parse-matches.matched }}"
  - name: count
    value: "{{ steps.parse-matches.count }}"