Keycard Crypt is a CLI tool to encrypt / decrypt files using encryption keys generated with Keycard. It uses keys from the EIP-1581 tree. It can process both single files and entire directories recursively. Each file will be encrypted / decrypted with a unique key using the card derivation feature. The Secure IO library is used to handle encryption / decryption of files. The encrypted files have .kef extension and will be stored in the same directory as originals.
Download Keycard Crypt from the release page.
keycard-crypt encrypt paths...
keycard-crypt decrypt paths...
By default the original files are removed once the encryption / decryption process is completed. To keep the original files use keycard-crypt -keep-originals encrypt paths... for encrypt and keycard-crypt -keep-originals decrypt paths... for decrypt.