2003-07-21 13:40:02 +00:00
|
|
|
=pod
|
|
|
|
|
|
|
|
=head1 NAME
|
|
|
|
|
|
|
|
ec - EC key processing
|
|
|
|
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
|
|
|
|
B<openssl> B<ec>
|
|
|
|
[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<-param_out>]
|
|
|
|
[B<-pubin>]
|
|
|
|
[B<-pubout>]
|
|
|
|
[B<-conv_form arg>]
|
|
|
|
[B<-param_enc arg>]
|
|
|
|
[B<-engine id>]
|
|
|
|
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
|
|
|
|
The B<ec> command processes EC keys. They can be converted between various
|
|
|
|
forms and their components printed out. B<Note> OpenSSL uses the
|
|
|
|
private key format specified in 'SEC 1: Elliptic Curve Cryptography'
|
|
|
|
(http://www.secg.org/). To convert a OpenSSL EC private key into the
|
|
|
|
PKCS#8 private key format use the B<pkcs8> command.
|
|
|
|
|
|
|
|
=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 ASN.1 DER encoded SEC1 private key. When used with a public key it
|
|
|
|
uses the SubjectPublicKeyInfo structur as specified in RFC 3280.
|
|
|
|
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, IDEA or
|
|
|
|
any other cipher supported by OpenSSL 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<ec> 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<-conv_form>
|
|
|
|
|
|
|
|
This specifies how the points on the elliptic curve are converted
|
|
|
|
into octet strings. Possible values are: B<compressed> (the default
|
|
|
|
value), B<uncompressed> and B<hybrid>. For more information regarding
|
|
|
|
the point conversion forms please read the X9.62 standard.
|
|
|
|
B<Note> Due to patent issues the B<compressed> option is disabled
|
|
|
|
by default for binary curves and can be enabled by defining
|
|
|
|
the preprocessor macro B<OPENSSL_EC_BIN_PT_COMP> at compile time.
|
|
|
|
|
|
|
|
=item B<-param_enc arg>
|
|
|
|
|
|
|
|
This specifies how the elliptic curve parameters are encoded.
|
|
|
|
Possible value are: B<named_curve>, i.e. the ec parameters are
|
|
|
|
specified by a OID, or B<explicit> where the ec parameters are
|
|
|
|
explicitly given (see RFC 3279 for the definition of the
|
|
|
|
EC parameters structures). The default value is B<named_curve>.
|
|
|
|
B<Note> the B<implicitlyCA> alternative ,as specified in RFC 3279,
|
|
|
|
is currently not implemented in OpenSSL.
|
|
|
|
|
|
|
|
=item B<-engine id>
|
|
|
|
|
2009-04-10 11:25:54 +00:00
|
|
|
specifying an engine (by its unique B<id> string) will cause B<ec>
|
2003-07-21 13:40:02 +00:00
|
|
|
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 EC PRIVATE KEY-----
|
|
|
|
-----END EC PRIVATE KEY-----
|
|
|
|
|
|
|
|
The PEM public key format uses the header and footer lines:
|
|
|
|
|
|
|
|
-----BEGIN PUBLIC KEY-----
|
|
|
|
-----END PUBLIC KEY-----
|
|
|
|
|
|
|
|
=head1 EXAMPLES
|
|
|
|
|
|
|
|
To encrypt a private key using triple DES:
|
|
|
|
|
|
|
|
openssl ec -in key.pem -des3 -out keyout.pem
|
|
|
|
|
|
|
|
To convert a private key from PEM to DER format:
|
|
|
|
|
|
|
|
openssl ec -in key.pem -outform DER -out keyout.der
|
|
|
|
|
|
|
|
To print out the components of a private key to standard output:
|
|
|
|
|
|
|
|
openssl ec -in key.pem -text -noout
|
|
|
|
|
|
|
|
To just output the public part of a private key:
|
|
|
|
|
|
|
|
openssl ec -in key.pem -pubout -out pubkey.pem
|
|
|
|
|
|
|
|
To change the parameters encoding to B<explicit>:
|
|
|
|
|
|
|
|
openssl ec -in key.pem -param_enc explicit -out keyout.pem
|
|
|
|
|
|
|
|
To change the point conversion form to B<compressed>:
|
|
|
|
|
|
|
|
openssl ec -in key.pem -conv_form compressed -out keyout.pem
|
|
|
|
|
|
|
|
=head1 SEE ALSO
|
|
|
|
|
|
|
|
L<ecparam(1)|ecparam(1)>, L<dsa(1)|dsa(1)>, L<rsa(1)|rsa(1)>
|
|
|
|
|
|
|
|
=head1 HISTORY
|
|
|
|
|
|
|
|
The ec command was first introduced in OpenSSL 0.9.8.
|
|
|
|
|
|
|
|
=head1 AUTHOR
|
|
|
|
|
|
|
|
Nils Larsch for the OpenSSL project (http://www.openssl.org).
|
|
|
|
|
|
|
|
=cut
|