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+=pod
+
+=head1 NAME
+
+dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message digests
+
+=head1 SYNOPSIS
+
+B<openssl> B<dgst> 
+[B<-md5|-md4|-md2|-sha1|-sha|-mdc2|-ripemd160|-dss1>]
+[B<-c>]
+[B<-d>]
+[B<-hex>]
+[B<-binary>]
+[B<-out filename>]
+[B<-sign filename>]
+[B<-passin arg>]
+[B<-verify filename>]
+[B<-prverify filename>]
+[B<-signature filename>]
+[B<-hmac key>]
+[B<file...>]
+
+[B<md5|md4|md2|sha1|sha|mdc2|ripemd160>]
+[B<-c>]
+[B<-d>]
+[B<file...>]
+
+=head1 DESCRIPTION
+
+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.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-c>
+
+print out the digest in two digit groups separated by colons, only relevant if
+B<hex> format output is used.
+
+=item B<-d>
+
+print out BIO debugging information.
+
+=item B<-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.
+
+=item B<-binary>
+
+output the digest or signature in binary form.
+
+=item B<-out filename>
+
+filename to output to, or standard output by default.
+
+=item B<-sign filename>
+
+digitally sign the digest using the private key in "filename".
+
+=item B<-passin arg>
+
+the private key password source. For more information about the format of B<arg>
+see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
+
+=item B<-verify filename>
+
+verify the signature using the the public key in "filename".
+The output is either "Verification OK" or "Verification Failure".
+
+=item B<-prverify filename>
+
+verify the signature using the  the private key in "filename".
+
+=item B<-signature filename>
+
+the actual signature to verify.
+
+=item B<-hmac key>
+
+create a hashed MAC using "key".
+
+=item B<-rand file(s)>
+
+a file or files containing random data used to seed the random number
+generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>).
+Multiple files can be specified separated by a OS-dependent character.
+The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
+all others. 
+
+=item B<file...>
+
+file or files to digest. If no files are specified then standard input is
+used.
+
+=back
+
+=head1 NOTES
+
+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 used.
+
+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 verified.
+
+=cut