Ask user for a key with confirmation. Repeats until two keys are the same and are not empty. Keyword arguments can be given to configure behavior: prompt (message displayed when asking for first key), confirm-prompt (message displayed when asking for the same key again), not-match-msg (message displayed when keys do not match), empty-msg (message displayed when the entered key is empty), retries (number of retries before quitting the loop; when set to nil or not given, it will continue indefinitely), confirmation? (requires key to be re-entered for confirmation, defaults to true), allow-empty? (allows the entered key to be an empty string; defaults to false), empty-nil? (returns nil instead of an empty string when on empty key; defaults to false), empty-quits? (short-circuits on any empty key and returns nil; defaults to false), empty-quits-nil? (returns nil when quitting on empty key; defaults to true). Returns the entered key or nil.

Ask user for a password with confirmation. Repeats until two passwords are the same and are not empty. Keyword arguments can be given to configure behavior: prompt (message displayed when asking for first password), confirm-prompt (message displayed when asking for the same password again), not-match-msg (message displayed when passwords do not match), empty-msg (message displayed when the entered password is empty), retries (number of retries before quitting the loop; when set to nil or not given, it will continue indefinitely), confirmation? (requires password to be re-entered for confirmation, defaults to true), allow-empty? (allows the entered password to be an empty string; defaults to false), empty-nil? (returns nil instead of an empty string when on empty password; defaults to false), empty-quits? (short-circuits on any empty password and returns nil; defaults to false), empty-quits-nil? (returns nil when quitting on empty password; defaults to true). Returns the entered password or nil.

Encrypts private key using random IV and the given password. Returns base64-encoded map of two keys.