DGST(1) OpenSSL DGST(1)NAME
dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message digests
SYNOPSIS
openssl dgst [-md5|-md4|-md2|-sha1|-sha|-mdc2|-ripemd160|-dss1] [-c]
[-d] [-hex] [-binary] [-out filename] [-sign filename] [-keyform arg]
[-passin arg] [-verify filename] [-prverify filename] [-signature
filename] [-hmac key] [file...]
[md5|md4|md2|sha1|sha|mdc2|ripemd160] [-c] [-d] [file...]
DESCRIPTION
The digest functions output the message digest of a supplied file or
files in hexadecimal form. They can also be used for digital signing
and verification.
OPTIONS-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".
-keyform arg
Specifies the key format to sign digest with. Only PEM and ENGINE
formats are supported by the dgst command.
-engine id
Use engine id for operations (including private key storage). This
engine is not used as source for digest algorithms, unless it is
also specified in the configuration file.
-sigopt nm:v
Pass options to the signature algorithm during sign or verify
operations. Names and values of these options are algorithm-
specific.
-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.
-hmac key
create a hashed MAC using "key".
-mac alg
create MAC (keyed Message Authentication Code). The most popular
MAC algorithm is HMAC (hash-based MAC), but there are other MAC
algorithms which are not based on hash, for instance gost-mac
algorithm, supported by ccgost engine. MAC keys and other options
should be set via -macopt parameter.
-macopt nm:v
Passes options to MAC algorithm, specified by -mac key. Following
options are supported by both by HMAC and gost-mac:
key:string
Specifies MAC key as alphnumeric string (use if key contain
printable characters only). String length must conform to
any restrictions of the MAC algorithm for example exactly
32 chars for gost-mac.
hexkey:string
Specifies MAC key in hexadecimal form (two hex digits per
byte). Key length must conform to any restrictions of the
MAC algorithm for example exactly 32 chars for gost-mac.
-randfile(s)
a file or files containing random data used to seed the random
number generator, or an EGD socket (see RAND_egd(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.
NOTES
The digest of choice for all new applications is SHA1. Other digests
are however still widely used.
If you wish to sign or verify data using the DSA algorithm then the
dss1 digest must be used.
A source of random numbers is required for certain signing algorithms,
in particular DSA.
The signing and verify options should only be used if a single file is
being signed or verified.
1.0.0k 2013-02-05 DGST(1)
