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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.

       -rand file(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.



1.0.1e                            2013-02-11                           DGST(1)

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