NAME
openssl-passphrase-options - Pass phrase options
SYNOPSIS
openssl command [ options ... ] [ parameters ... ]
DESCRIPTION
Several OpenSSL commands accept password arguments, typically using -passin and -passout for input and output passwords respectively. These allow the password to be obtained from a variety of sources. Both of these options take a single argument whose format is described below. If no password argument is given and a password is required then the user is prompted to enter one: this will typically be read from the current terminal with echoing turned off.
Note that character encoding may be relevant, please see passphrase-encoding(7).
OPTIONS
Pass Phrase
Option Arguments
Pass phrase arguments can be formatted as follows.
pass:password
The actual password is password. Since the password is visible to utilities (like ’ps’ under Unix) this form should only be used where security is not important.
env:var
Obtain the password from the environment variable var. Since the environment of other processes is visible on certain platforms (e.g. ps under certain Unix OSes) this option should be used with caution.
file:pathname
The first line of pathname is the password. If the same pathname argument is supplied to -passin and -passout arguments then the first line will be used for the input password and the next line for the output password. pathname need not refer to a regular file: it could for example refer to a device or named pipe.
fd:number
Read the password from the file descriptor number. This can be used to send the data via a pipe for example.
stdin
Read the password from standard input.
COPYRIGHT
Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>;.