Correct minor spelling error.

[openssl.git] / doc / apps / dgst.pod

diff --git a/doc/apps/dgst.pod b/doc/apps/dgst.pod
index cbf2cc529aa304eb3422c7530b13973ea0736b9b..1648742bcfe188647539f55978ac7d48bbb6d505 100644 (file)
--- a/doc/apps/dgst.pod
+++ b/doc/apps/dgst.pod
@@ -2,25 +2,32 @@
 
 =head1 NAME
 
-dgst, md5, md2, sha1, sha, mdc2, ripemd160 - message digests
+dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message digests
 
 =head1 SYNOPSIS
 
-[B<dgst>]
-[B<-md5|-md2|-sha1|-sha|mdc2|-ripemd160>]
+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<-verify filename>]
+[B<-prverify filename>]
+[B<-signature filename>]
 [B<file...>]
 
-[B<md5|md2|sha1|sha|mdc2|ripemd160>]
+[B<md5|md4|md2|sha1|sha|mdc2|ripemd160>]
 [B<-c>]
 [B<-d>]
 [B<file...>]
 
 =head1 DESCRIPTION
 
-The digest functions print out the message digest of a supplied file or files
-in hexadecimal form.
+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
 
@@ -28,12 +35,51 @@ in hexadecimal form.
 
 =item B<-c>
 
-print out the digest in two digit groups separated by colons.
+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<-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<-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
@@ -46,4 +92,13 @@ 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 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