PKCS7

pkcs7 − PKCS#7 utility

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

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

−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.

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

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−−−−−

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 .

crl2pkcs7(1)