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CentOS 7.0 - man page for md5 (centos section 1)

DGST(1) 				     OpenSSL					  DGST(1)

       dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message digests

       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...]

       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.

       -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.

	   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

       -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

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

       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

       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

1.0.1e					    2013-02-11					  DGST(1)

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