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=pod
=head1 NAME
openssl-format-options - OpenSSL command input and output format options
=head1 SYNOPSIS
B<openssl>
I<command>
[ I<options> ... ]
[ I<parameters> ... ]
=head1 DESCRIPTION
Several OpenSSL commands can take input or generate output in a variety
of formats.
Since OpenSSL 3.0 keys, single certificates, and CRLs can be read from
files in any of the B<DER>, B<PEM> or B<P12> formats,
while specifying their input format is no more needed.
In order to access a key via an engine the input format B<ENGINE> may be used;
alternatively the key identifier in the <uri> argument of the respective key
option may be preceded by C<org.openssl.engine:>.
See L<openssl(1)/Engine Options> for an example usage of the latter.
=head1 OPTIONS
=head2 Format Options
The options to specify the format are as follows.
Refer to the individual man page to see which options are accepted.
=over 4
=item B<-inform> I<format>, B<-outform> I<format>
The format of the input or output streams.
=item B<-keyform> I<format>
Format of a private key input source.
The only value with effect is B<ENGINE>; all others have become obsolete.
See L<openssl(1)/Format Options> for details.
=item B<-CRLform> I<format>
Format of a CRL input source.
=back
=head2 Format Option Arguments
The possible format arguments are described below.
Both uppercase and lowercase are accepted.
The list of acceptable format arguments, and the default,
is described in each command documentation.
=over 4
=item B<DER>
A binary format, encoded or parsed according to Distinguished Encoding Rules
(DER) of the ASN.1 data language.
=item B<ENGINE>
Used to specify that the cryptographic material is in an OpenSSL B<engine>.
An engine must be configured or specified using the B<-engine> option.
A password or PIN may be supplied to the engine using the B<-passin> option.
=item B<P12>
A DER-encoded file containing a PKCS#12 object.
It might be necessary to provide a decryption password to retrieve
the private key.
=item B<PEM>
A text format defined in IETF RFC 1421 and IETF RFC 7468. Briefly, this is
a block of base-64 encoding (defined in IETF RFC 4648), with specific
lines used to mark the start and end:
Text before the BEGIN line is ignored.
----- BEGIN object-type -----
OT43gQKBgQC/2OHZoko6iRlNOAQ/tMVFNq7fL81GivoQ9F1U0Qr+DH3ZfaH8eIkX
xT0ToMPJUzWAn8pZv0snA0um6SIgvkCuxO84OkANCVbttzXImIsL7pFzfcwV/ERK
UM6j0ZuSMFOCr/lGPAoOQU0fskidGEHi1/kW+suSr28TqsyYZpwBDQ==
----- END object-type -----
Text after the END line is also ignored
The I<object-type> must match the type of object that is expected.
For example a C<BEGIN X509 CERTIFICATE> will not match if the command
is trying to read a private key. The types supported include:
ANY PRIVATE KEY
CERTIFICATE
CERTIFICATE REQUEST
CMS
DH PARAMETERS
DSA PARAMETERS
DSA PUBLIC KEY
EC PARAMETERS
EC PRIVATE KEY
ECDSA PUBLIC KEY
ENCRYPTED PRIVATE KEY
PARAMETERS
PKCS #7 SIGNED DATA
PKCS7
PRIVATE KEY
PUBLIC KEY
RSA PRIVATE KEY
SSL SESSION PARAMETERS
TRUSTED CERTIFICATE
X509 CRL
X9.42 DH PARAMETERS
The following legacy I<object-type>'s are also supported for compatibility
with earlier releases:
DSA PRIVATE KEY
NEW CERTIFICATE REQUEST
RSA PUBLIC KEY
X509 CERTIFICATE
=item B<SMIME>
An S/MIME object as described in IETF RFC 8551.
Earlier versions were known as CMS and are compatible.
Note that the parsing is simple and might fail to parse some legal data.
=back
=head1 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
L<https://www.openssl.org/source/license.html>.
=cut
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