1=pod 2 3=head1 NAME 4 5openssl-passphrase-options - Pass phrase options 6 7=head1 SYNOPSIS 8 9B<openssl> 10I<command> 11[ I<options> ... ] 12[ I<parameters> ... ] 13 14=head1 DESCRIPTION 15 16Several OpenSSL commands accept password arguments, typically using B<-passin> 17and B<-passout> for input and output passwords respectively. These allow 18the password to be obtained from a variety of sources. Both of these 19options take a single argument whose format is described below. If no 20password argument is given and a password is required then the user is 21prompted to enter one: this will typically be read from the current 22terminal with echoing turned off. 23 24Note that character encoding may be relevant, please see 25L<passphrase-encoding(7)>. 26 27=head1 OPTIONS 28 29=head2 Pass Phrase Option Arguments 30 31Pass phrase arguments can be formatted as follows. 32 33=over 4 34 35=item B<pass:>I<password> 36 37The actual password is I<password>. Since the password is visible 38to utilities (like 'ps' under Unix) this form should only be used 39where security is not important. 40 41=item B<env:>I<var> 42 43Obtain the password from the environment variable I<var>. Since 44the environment of other processes is visible on certain platforms 45(e.g. ps under certain Unix OSes) this option should be used with caution. 46 47=item B<file:>I<pathname> 48 49The first line of I<pathname> is the password. If the same I<pathname> 50argument is supplied to B<-passin> and B<-passout> arguments then the first 51line will be used for the input password and the next line for the output 52password. I<pathname> need not refer to a regular file: it could for example 53refer to a device or named pipe. 54 55=item B<fd:>I<number> 56 57Read the password from the file descriptor I<number>. This can be used to 58send the data via a pipe for example. 59 60=item B<stdin> 61 62Read the password from standard input. 63 64=back 65 66=head1 COPYRIGHT 67 68Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. 69 70Licensed under the Apache License 2.0 (the "License"). You may not use 71this file except in compliance with the License. You can obtain a copy 72in the file LICENSE in the source distribution or at 73L<https://www.openssl.org/source/license.html>. 74 75=cut 76