The DES block cipher and the parity helper come from mbedtls, which is
already a submodule; DES_set_key follows LibreSSL with DES_check_key
off and stores the key in the schedule.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FzhWRMauD3ouc8kSxT2NnT
