PKCS7

pkcs7 − PKCS#7 utility

openssl pkcs7 [−inform PEM│DER] [−outform PEM│DER] [−in filename] [−out filename] [−print_certs] [−text] [−noout]

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).

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 compatability 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)