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RedHat 9 (Linux i386) - man page for md2 (redhat section 1)

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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] [-verify filename] [-prverify filename] [-signature file-
       name] [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".

       -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.

       -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

0.9.7a					    2000-09-04					  DGST(1)
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