104 lines
2.2 KiB
Text
104 lines
2.2 KiB
Text
=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>]
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[B<-d>]
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[B<-hex>]
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[B<-binary>]
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[B<-out filename>]
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[B<-sign filename>]
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[B<-verify filename>]
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[B<-prverify filename>]
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[B<-signature filename>]
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[B<file...>]
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[B<md5|md4|md2|sha1|sha|mdc2|ripemd160>]
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[B<-c>]
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[B<-d>]
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[B<file...>]
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=head1 DESCRIPTION
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The digest functions output the message digest of a supplied file or files
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in hexadecimal form. They can also be used for digital signing and verification.
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=head1 OPTIONS
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=over 4
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=item B<-c>
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print out the digest in two digit groups separated by colons, only relevant if
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B<hex> format output is used.
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=item B<-d>
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print out BIO debugging information.
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=item B<-hex>
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digest is to be output as a hex dump. This is the default case for a "normal"
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digest as opposed to a digital signature.
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=item B<-binary>
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output the digest or signature in binary form.
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=item B<-out filename>
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filename to output to, or standard output by default.
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=item B<-sign filename>
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digitally sign the digest using the private key in "filename".
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=item B<-verify filename>
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verify the signature using the the public key in "filename".
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The output is either "Verification OK" or "Verification Failure".
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=item B<-prverify filename>
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verify the signature using the the private key in "filename".
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=item B<-signature filename>
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the actual signature to verify.
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=item B<-rand file(s)>
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a file or files containing random data used to seed the random number
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generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>).
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Multiple files can be specified separated by a OS-dependent character.
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The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
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all others.
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=item B<file...>
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file or files to digest. If no files are specified then standard input is
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used.
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=back
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=head1 NOTES
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The digest of choice for all new applications is SHA1. Other digests are
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however still widely used.
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If you wish to sign or verify data using the DSA algorithm then the dss1
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digest must be used.
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A source of random numbers is required for certain signing algorithms, in
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particular DSA.
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The signing and verify options should only be used if a single file is
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being signed or verified.
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=cut
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