dgst.pod 2.5 KB
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=pod
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=head1 NAME

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dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message digests
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=head1 SYNOPSIS

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B<openssl> B<dgst> 
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[B<-md5|-md4|-md2|-sha1|-sha|-mdc2|-ripemd160|-dss1>]
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[B<-c>]
[B<-d>]
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[B<-hex>]
[B<-binary>]
[B<-out filename>]
[B<-sign filename>]
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[B<-passin arg>]
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[B<-verify filename>]
[B<-prverify filename>]
[B<-signature filename>]
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[B<-hmac key>]
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[B<file...>]

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[B<md5|md4|md2|sha1|sha|mdc2|ripemd160>]
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[B<-c>]
[B<-d>]
[B<file...>]

=head1 DESCRIPTION

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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.
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=head1 OPTIONS

=over 4

=item B<-c>

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print out the digest in two digit groups separated by colons, only relevant if
B<hex> format output is used.
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=item B<-d>

print out BIO debugging information.

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=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".

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=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)>.

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=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.

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=item B<-hmac key>

create a hashed MAC using "key".

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=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. 

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=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.

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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.

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=cut