/usr/man/cat.1/mdc2.1

DGST(1)                      OpenSSL                      DGST(1)

NAME

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

SYNOPSIS

     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] [...]

DESCRIPTION

     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.

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.  See NOTES below for digital
         signatures using -hex.

     -binary
         output the digest or signature in binary form.

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

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

     -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

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DGST(1)                      OpenSSL                      DGST(1)

         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 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

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DGST(1)                      OpenSSL                      DGST(1)

                 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.

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

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

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

EXAMPLES

     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 \
      file.txt

NOTES

     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.

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DGST(1)                      OpenSSL                      DGST(1)

     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 verified.

     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.

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See also dgst(1)
See also dss1(1)
See also md2(1)
See also md4(1)
See also md5(1)
See also openssl-dgst(1)
See also ripemd160(1)
See also sha(1)
See also sha1(1)
See also sha224(1)
See also sha256(1)
See also sha384(1)
See also sha512(1)