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DGST(1SSL)                                   OpenSSL                                   DGST(1SSL)

       dgst, sha, sha1, mdc2, ripemd160, sha224, sha256, sha384, sha512, md2, md4, md5, dss1 -
       message digests

       openssl dgst
       [-sha|-sha1|-mdc2|-ripemd160|-sha224|-sha256|-sha384|-sha512|-md2|-md4|-md5|-dss1] [-c]
       [-d] [-hex] [-binary] [-r] [-non-fips-allow] [-out filename] [-sign filename] [-keyform
       arg] [-passin arg] [-verify filename] [-prverify filename] [-signature filename] [-hmac
       key] [-non-fips-allow] [-fips-fingerprint] [file...]

       openssl [digest] [...]

       The digest functions output the message digest of a supplied file or files in hexadecimal.
       The digest functions also generate and verify digital signatures using message digests.

       -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.

           digest is to be output as a hex dump. This is the default case for a "normal" digest
           as opposed to a digital signature.  See NOTES below for digital signatures using -hex.

           output the digest or signature in binary form.

       -r  output the digest in the "coreutils" format used by programs like sha1sum.

           Allow use of non FIPS digest when in FIPS mode.  This has no effect when not in FIPS

       -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. The DER, PEM, P12, and ENGINE formats
           are supported.

       -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

       -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:

                   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.

                   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

           enable use of non-FIPS algorithms such as MD5 even in FIPS mode.

           compute HMAC using a specific key for certain OpenSSL-FIPS operations.

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

       To create a hex-encoded message digest of a file:
        openssl dgst -md5 -hex file.txt

       To sign a file using SHA-256 with binary file output:
        openssl dgst -sha256 -sign privatekey.pem -out signature.sign file.txt

       To verify a signature:
        openssl dgst -sha256 -verify publickey.pem \
        -signature signature.sign \

       The digest of choice for all new applications is SHA1. Other digests are however still
       widely used.

       When signing a file, dgst will automatically determine the algorithm (RSA, ECC, etc) to
       use for signing based on the private key's ASN.1 info.  When verifying signatures, it only
       handles the RSA, DSA, or ECDSA signature itself, not the related data to identify the
       signer and algorithm used in formats such as x.509, CMS, and S/MIME.

       A source of random numbers is required for certain signing algorithms, in particular ECDSA
       and DSA.

       The signing and verify options should only be used if a single file is being signed or

       Hex signatures cannot be verified using openssl.  Instead, use "xxd -r" or similar program
       to transform the hex signature into a binary signature prior to verification.

1.0.1t                                      2016-05-03                                 DGST(1SSL)

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