=pod
=head1 NAME
pkcs7 - PKCS#7 utility
=head1 SYNOPSIS
B<openssl> B<pkcs7>
[B<-inform PEM|DER>]
[B<-outform PEM|DER>]
[B<-in filename>]
[B<-out filename>]
[B<-print_certs>]
[B<-text>]
[B<-noout>]
[B<-engine id>]
=head1 DESCRIPTION
The B<pkcs7> command processes PKCS#7 files in DER or PEM format.
=head1 COMMAND OPTIONS
=over 4
=item B<-inform DER|PEM>
This specifies the input format. B<DER> format is DER encoded PKCS#7
v1.5 structure.B<PEM> (the default) is a base64 encoded version of
the DER form with header and footer lines.
=item B<-outform DER|PEM>
This specifies the output format, the options have the same meaning as the
B<-inform> option.
=item B<-in filename>
This specifies the input filename to read from or standard input if this
option is not specified.
=item B<-out filename>
specifies the output filename to write to or standard output by
default.
=item B<-print_certs>
prints out any certificates or CRLs contained in the file. They are
preceded by their subject and issuer names in one line format.
=item B<-text>
prints out certificates details in full rather than just subject and
issuer names.
=item B<-noout>
don't output the encoded version of the PKCS#7 structure (or certificates
is B<-print_certs> is set).
=item B<-engine id>
specifying an engine (by it's unique B<id> string) will cause B<req>
to attempt to obtain a functional reference to the specified engine,
thus initialising it if needed. The engine will then be set as the default
for all available algorithms.
=back
=head1 EXAMPLES
Convert a PKCS#7 file from PEM to DER:
openssl pkcs7 -in file.pem -outform DER -out file.der
Output all certificates in a file:
openssl pkcs7 -in file.pem -print_certs -out certs.pem
=head1 NOTES
The PEM PKCS#7 format uses the header and footer lines:
-----BEGIN PKCS7-----
-----END PKCS7-----
For compatibility with some CAs it will also accept:
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
=head1 RESTRICTIONS
There is no option to print out all the fields of a PKCS#7 file.
This PKCS#7 routines only understand PKCS#7 v 1.5 as specified in RFC2315 they
cannot currently parse, for example, the new CMS as described in RFC2630.
=head1 SEE ALSO
L<crl2pkcs7(1)|crl2pkcs7(1)>
=cut
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