1=pod
2
3=head1 NAME
4
5dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message digests
6
7=head1 SYNOPSIS
8
9B<openssl> B<dgst> 
10[B<-md5|-md4|-md2|-sha1|-sha|-mdc2|-ripemd160|-dss1>]
11[B<-c>]
12[B<-d>]
13[B<-hex>]
14[B<-binary>]
15[B<-out filename>]
16[B<-sign filename>]
17[B<-passin arg>]
18[B<-verify filename>]
19[B<-prverify filename>]
20[B<-signature filename>]
21[B<-hmac key>]
22[B<file...>]
23
24[B<md5|md4|md2|sha1|sha|mdc2|ripemd160>]
25[B<-c>]
26[B<-d>]
27[B<file...>]
28
29=head1 DESCRIPTION
30
31The digest functions output the message digest of a supplied file or files
32in hexadecimal form. They can also be used for digital signing and verification.
33
34=head1 OPTIONS
35
36=over 4
37
38=item B<-c>
39
40print out the digest in two digit groups separated by colons, only relevant if
41B<hex> format output is used.
42
43=item B<-d>
44
45print out BIO debugging information.
46
47=item B<-hex>
48
49digest is to be output as a hex dump. This is the default case for a "normal"
50digest as opposed to a digital signature.
51
52=item B<-binary>
53
54output the digest or signature in binary form.
55
56=item B<-out filename>
57
58filename to output to, or standard output by default.
59
60=item B<-sign filename>
61
62digitally sign the digest using the private key in "filename".
63
64=item B<-passin arg>
65
66the private key password source. For more information about the format of B<arg>
67see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
68
69=item B<-verify filename>
70
71verify the signature using the the public key in "filename".
72The output is either "Verification OK" or "Verification Failure".
73
74=item B<-prverify filename>
75
76verify the signature using the  the private key in "filename".
77
78=item B<-signature filename>
79
80the actual signature to verify.
81
82=item B<-hmac key>
83
84create a hashed MAC using "key".
85
86=item B<-rand file(s)>
87
88a file or files containing random data used to seed the random number
89generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>).
90Multiple files can be specified separated by a OS-dependent character.
91The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
92all others. 
93
94=item B<file...>
95
96file or files to digest. If no files are specified then standard input is
97used.
98
99=back
100
101=head1 NOTES
102
103The digest of choice for all new applications is SHA1. Other digests are
104however still widely used.
105
106If you wish to sign or verify data using the DSA algorithm then the dss1
107digest must be used.
108
109A source of random numbers is required for certain signing algorithms, in
110particular DSA.
111
112The signing and verify options should only be used if a single file is
113being signed or verified.
114
115=cut
116