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+=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>
+
+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 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