You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
164 lines
4.4 KiB
164 lines
4.4 KiB
=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<-aes128>] |
|
[B<-aes192>] |
|
[B<-aes256>] |
|
[B<-camellia128>] |
|
[B<-camellia192>] |
|
[B<-camellia256>] |
|
[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<-aes128|-aes192|-aes256|-camellia128|-camellia192|-camellia256|-des|-des3|-idea> |
|
|
|
These options encrypt the private key with the specified |
|
cipher 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 its unique B<id> string) will cause B<dsa> |
|
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
|
|
|