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+=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