NAME

pkcs7 - PKCS#7 utility

LIBRARY

libcrypto, -lcrypto

SYNOPSIS

openssl pkcs7 [ -inform PEM|DER] [ -outform PEM|DER] [ -in filename] [ -out filename] [ -print_certs] [ -text] [ -noout] [ -engine id]

DESCRIPTION

The pkcs7 command processes PKCS#7 files in DER or PEM format.

COMMAND OPTIONS

-inform DER|PEM: This specifies the input format. DER format is DER encoded PKCS#7 v1.5 structure. PEM (the default) is a base64 encoded version of the DER form with header and footer lines.

-outform DER|PEM: This specifies the output format, the options have the same meaning as the -inform option.

-in filename: This specifies the input filename to read from or standard input if this option is not specified.

-out filename: specifies the output filename to write to or standard output by default.

-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.

-text: prints out certificates details in full rather than just subject and issuer names.

-noout: don't output the encoded version of the PKCS#7 structure (or certificates is -print_certs is set).

-engine id: specifying an engine (by its unique id string) will cause pkcs7 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.

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

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-----

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.