The pkcs7 command processes PKCS#7 files in DER or PEM format.
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.
This specifies the output format, the options have the same meaning as the
This specifies the input filename to read from or standard input if this
option is not specified.
specifies the output filename to write to or standard output by
prints out any certificates or CRLs contained in the file. They are
preceded by their subject and issuer names in one line format.
prints out certificates details in full rather than just subject and
don't output the encoded version of the PKCS#7 structure (or certificates
is -print_certs is set).
specifying an engine (by it's unique id string) will cause 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.
Convert a PKCS#7 file from PEM to DER:
openssl pkcs7 -in file.pem -outform DER -out file.der