ConstantRetriever returns a new Retriever which will return a constant string as a passphrase.

GetPassphrase get the passphrase from bufio.Reader or from terminal.

PromptRetriever returns a new Retriever which will provide a prompt on stdin and stdout to retrieve a passphrase.

PromptRetrieverWithInOut returns a new Retriever which will provide a prompt using the given in and out readers.

ErrDontMatch is returned if the two entered passphrases don't match.

ErrNoInput is returned if we do not have a valid input method for passphrases.

ErrTooManyAttempts is returned if the maximum number of passphrase entry attempts is reached.

ErrTooShort is returned if the passphrase entered for a new key is below the minimum length.