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-=pod
-
-=head1 NAME
-
-dsa - DSA key processing
-
-=head1 SYNOPSIS
-
-B<openssl> B<dsa>
-[B<-inform PEM|DER>]
-[B<-outform PEM|DER>]
-[B<-in filename>]
-[B<-passin arg>]
-[B<-out filename>]
-[B<-passout arg>]
-[B<-des>]
-[B<-des3>]
-[B<-idea>]
-[B<-text>]
-[B<-noout>]
-[B<-modulus>]
-[B<-pubin>]
-[B<-pubout>]
-[B<-engine id>]
-
-=head1 DESCRIPTION
-
-The B<dsa> command processes DSA keys. They can be converted between various
-forms and their components printed out. B<Note> This command uses the
-traditional SSLeay compatible format for private key encryption: newer
-applications should use the more secure PKCS#8 format using the B<pkcs8>
-
-=head1 COMMAND OPTIONS
-
-=over 4
-
-=item B<-inform DER|PEM>
-
-This specifies the input format. The B<DER> option with a private key uses
-an ASN1 DER encoded form of an ASN.1 SEQUENCE consisting of the values of
-version (currently zero), p, q, g, the public and private key components
-respectively as ASN.1 INTEGERs. When used with a public key it uses a
-SubjectPublicKeyInfo structure: it is an error if the key is not DSA.
-
-The B<PEM> form is the default format: it consists of the B<DER> format base64
-encoded with additional header and footer lines. In the case of a private key
-PKCS#8 format is also accepted.
-
-=item B<-outform DER|PEM>
-
-This specifies the output format, the options have the same meaning as the
-B<-inform> option.
-
-=item B<-in filename>
-
-This specifies the input filename to read a key from or standard input if this
-option is not specified. If the key is encrypted a pass phrase will be
-prompted for.
-
-=item B<-passin arg>
-
-the input file 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<-out filename>
-
-This specifies the output filename to write a key to or standard output by
-is not specified. If any encryption options are set then a pass phrase will be
-prompted for. The output filename should B<not> be the same as the input
-filename.
-
-=item B<-passout arg>
-
-the output file 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<-des|-des3|-idea>
-
-These options encrypt the private key with the DES, triple DES, or the
-IDEA ciphers respectively before outputting it. A pass phrase is prompted for.
-If none of these options is specified the key is written in plain text. This
-means that using the B<dsa> utility to read in an encrypted key with no
-encryption option can be used to remove the pass phrase from a key, or by
-setting the encryption options it can be use to add or change the pass phrase.
-These options can only be used with PEM format output files.
-
-=item B<-text>
-
-prints out the public, private key components and parameters.
-
-=item B<-noout>
-
-this option prevents output of the encoded version of the key.
-
-=item B<-modulus>
-
-this option prints out the value of the public key component of the key.
-
-=item B<-pubin>
-
-by default a private key is read from the input file: with this option a
-public key is read instead.
-
-=item B<-pubout>
-
-by default a private key is output. With this option a public
-key will be output instead. This option is automatically set if the input is
-a public key.
-
-=item B<-engine id>
-
-specifying an engine (by it's unique B<id> string) will cause B<req>
-to attempt to obtain a functional reference to the specified engine,
-thus initialising it if needed. The engine will then be set as the default
-for all available algorithms.
-
-=back
-
-=head1 NOTES
-
-The PEM private key format uses the header and footer lines:
-
- -----BEGIN DSA PRIVATE KEY-----
- -----END DSA PRIVATE KEY-----
-
-The PEM public key format uses the header and footer lines:
-
- -----BEGIN PUBLIC KEY-----
- -----END PUBLIC KEY-----
-
-=head1 EXAMPLES
-
-To remove the pass phrase on a DSA private key:
-
- openssl dsa -in key.pem -out keyout.pem
-
-To encrypt a private key using triple DES:
-
- openssl dsa -in key.pem -des3 -out keyout.pem
-
-To convert a private key from PEM to DER format:
-
- openssl dsa -in key.pem -outform DER -out keyout.der
-
-To print out the components of a private key to standard output:
-
- openssl dsa -in key.pem -text -noout
-
-To just output the public part of a private key:
-
- openssl dsa -in key.pem -pubout -out pubkey.pem
-
-=head1 SEE ALSO
-
-L<dsaparam(1)|dsaparam(1)>, L<gendsa(1)|gendsa(1)>, L<rsa(1)|rsa(1)>,
-L<genrsa(1)|genrsa(1)>
-
-=cut
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