[md5|md4|md2|sha1|sha|mdc2|ripemd160] [-c] [-d] [file...]

-c

print out the digest in two digit groups separated by colons, only relevant if hex format output is used.

-d

print out BIO debugging information.

-hex

digest is to be output as a hex dump. This is the default case for a ``normal'' digest as opposed to a digital signature.

-binary

output the digest or signature in binary form.

-out filename

filename to output to, or standard output by default.

-sign filename

digitally sign the digest using the private key in ``filename''.

-passin arg

the private key password source. For more information about the format of arg see the PASS PHRASE ARGUMENTS section in openssl(1).

-verify filename

verify the signature using the the public key in ``filename''. The output is either ``Verification OK'' or ``Verification Failure''.

-prverify filename

verify the signature using the the private key in ``filename''.

-signature filename

the actual signature to verify.

-rand file(s)

a file or files containing random data used to seed the random number generator, or an EGD socket (see (3)). Multiple files can be specified separated by a OS-dependent character. The separator is ; for MS-Windows, , for OpenVMS, and : for all others.

file...

file or files to digest. If no files are specified then standard input is used.