DGST(1)				    OpenSSL			       DGST(1)



NAME
       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
	   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 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.

       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.



1.0.2k				  2017-01-26			       DGST(1)