recaptcha_password_check_helpers_ex
Copyright 2026 Net Health

This product is a port to Elixir of the following work by Google LLC, licensed under the Apache License, Version 2.0:

  - com.google.cloud:recaptcha-password-check-helpers (github.com/GoogleCloudPlatform/java-recaptcha-password-check-helpers)

Portions of the protocol constants, the username canonicalization rules, and the elliptic curve commutative cipher construction are derived from that implementation. Test vectors under test/fixtures and the expected values in `test/recaptcha_password_check/crypto_helper_test.exs` and `test/recaptcha_password_check/crypto_helper/bit_prefix_test.exs` originate from its test suite.

Copyright 2021 Google LLC
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