openssl-passphrase-options - Pass phrase options
openssl command [
options ... ] [
parameters ... ]
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).
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.
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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>.