190 lines
5.4 KiB
Text
190 lines
5.4 KiB
Text
=pod
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=head1 NAME
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ec - EC key processing
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=head1 SYNOPSIS
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B<openssl> B<ec>
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[B<-inform PEM|DER>]
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[B<-outform PEM|DER>]
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[B<-in filename>]
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[B<-passin arg>]
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[B<-out filename>]
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[B<-passout arg>]
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[B<-des>]
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[B<-des3>]
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[B<-idea>]
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[B<-text>]
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[B<-noout>]
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[B<-param_out>]
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[B<-pubin>]
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[B<-pubout>]
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[B<-conv_form arg>]
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[B<-param_enc arg>]
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[B<-engine id>]
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=head1 DESCRIPTION
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The B<ec> command processes EC keys. They can be converted between various
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forms and their components printed out. B<Note> OpenSSL uses the
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private key format specified in 'SEC 1: Elliptic Curve Cryptography'
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(http://www.secg.org/). To convert a OpenSSL EC private key into the
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PKCS#8 private key format use the B<pkcs8> command.
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=head1 COMMAND OPTIONS
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=over 4
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=item B<-inform DER|PEM>
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This specifies the input format. The B<DER> option with a private key uses
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an ASN.1 DER encoded SEC1 private key. When used with a public key it
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uses the SubjectPublicKeyInfo structur as specified in RFC 3280.
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The B<PEM> form is the default format: it consists of the B<DER> format base64
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encoded with additional header and footer lines. In the case of a private key
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PKCS#8 format is also accepted.
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=item B<-outform DER|PEM>
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This specifies the output format, the options have the same meaning as the
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B<-inform> option.
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=item B<-in filename>
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This specifies the input filename to read a key from or standard input if this
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option is not specified. If the key is encrypted a pass phrase will be
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prompted for.
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=item B<-passin arg>
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the input file password source. For more information about the format of B<arg>
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see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
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=item B<-out filename>
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This specifies the output filename to write a key to or standard output by
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is not specified. If any encryption options are set then a pass phrase will be
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prompted for. The output filename should B<not> be the same as the input
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filename.
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=item B<-passout arg>
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the output file password source. For more information about the format of B<arg>
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see the B<PASS PHRASE ARGUMENTS> section in L<openssl(1)|openssl(1)>.
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=item B<-des|-des3|-idea>
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These options encrypt the private key with the DES, triple DES, IDEA or
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any other cipher supported by OpenSSL before outputting it. A pass phrase is
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prompted for.
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If none of these options is specified the key is written in plain text. This
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means that using the B<ec> utility to read in an encrypted key with no
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encryption option can be used to remove the pass phrase from a key, or by
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setting the encryption options it can be use to add or change the pass phrase.
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These options can only be used with PEM format output files.
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=item B<-text>
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prints out the public, private key components and parameters.
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=item B<-noout>
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this option prevents output of the encoded version of the key.
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=item B<-modulus>
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this option prints out the value of the public key component of the key.
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=item B<-pubin>
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by default a private key is read from the input file: with this option a
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public key is read instead.
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=item B<-pubout>
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by default a private key is output. With this option a public
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key will be output instead. This option is automatically set if the input is
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a public key.
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=item B<-conv_form>
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This specifies how the points on the elliptic curve are converted
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into octet strings. Possible values are: B<compressed> (the default
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value), B<uncompressed> and B<hybrid>. For more information regarding
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the point conversion forms please read the X9.62 standard.
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B<Note> Due to patent issues the B<compressed> option is disabled
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by default for binary curves and can be enabled by defining
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the preprocessor macro B<OPENSSL_EC_BIN_PT_COMP> at compile time.
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=item B<-param_enc arg>
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This specifies how the elliptic curve parameters are encoded.
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Possible value are: B<named_curve>, i.e. the ec parameters are
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specified by a OID, or B<explicit> where the ec parameters are
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explicitly given (see RFC 3279 for the definition of the
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EC parameters structures). The default value is B<named_curve>.
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B<Note> the B<implicitlyCA> alternative ,as specified in RFC 3279,
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is currently not implemented in OpenSSL.
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=item B<-engine id>
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specifying an engine (by it's unique B<id> string) will cause B<req>
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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=back
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=head1 NOTES
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The PEM private key format uses the header and footer lines:
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-----BEGIN EC PRIVATE KEY-----
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-----END EC PRIVATE KEY-----
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The PEM public key format uses the header and footer lines:
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-----BEGIN PUBLIC KEY-----
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-----END PUBLIC KEY-----
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=head1 EXAMPLES
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To encrypt a private key using triple DES:
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openssl ec -in key.pem -des3 -out keyout.pem
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To convert a private key from PEM to DER format:
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openssl ec -in key.pem -outform DER -out keyout.der
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To print out the components of a private key to standard output:
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openssl ec -in key.pem -text -noout
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To just output the public part of a private key:
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openssl ec -in key.pem -pubout -out pubkey.pem
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To change the parameters encoding to B<explicit>:
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openssl ec -in key.pem -param_enc explicit -out keyout.pem
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To change the point conversion form to B<compressed>:
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openssl ec -in key.pem -conv_form compressed -out keyout.pem
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=head1 SEE ALSO
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L<ecparam(1)|ecparam(1)>, L<dsa(1)|dsa(1)>, L<rsa(1)|rsa(1)>
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=head1 HISTORY
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The ec command was first introduced in OpenSSL 0.9.8.
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=head1 AUTHOR
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Nils Larsch for the OpenSSL project (http://www.openssl.org).
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=cut
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