<h2>File Contents: //opt/alt/openssl/share/man/man1/openssl-ecparam.1ssl</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//opt/alt/openssl/share/man/man1/openssl-ecparam.1ssl'><textarea name='file_content' rows='10' cols='50'>.\&quot; Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35)
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.IX Title &quot;ECPARAM 1&quot;
.TH ECPARAM 1 &quot;2019-12-20&quot; &quot;1.0.2u&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
openssl\-ecparam,
ecparam \- EC parameter manipulation and generation
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
\&amp;\fBopenssl ecparam\fR
[\fB\-inform DER|PEM\fR]
[\fB\-outform DER|PEM\fR]
[\fB\-in filename\fR]
[\fB\-out filename\fR]
[\fB\-noout\fR]
[\fB\-text\fR]
[\fB\-C\fR]
[\fB\-check\fR]
[\fB\-name arg\fR]
[\fB\-list_curves\fR]
[\fB\-conv_form arg\fR]
[\fB\-param_enc arg\fR]
[\fB\-no_seed\fR]
[\fB\-rand file(s)\fR]
[\fB\-genkey\fR]
[\fB\-engine id\fR]
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
This command is used to manipulate or generate \s-1EC\s0 parameter files.
.SH &quot;OPTIONS&quot;
.IX Header &quot;OPTIONS&quot;
.IP &quot;\fB\-inform DER|PEM\fR&quot; 4
.IX Item &quot;-inform DER|PEM&quot;
This specifies the input format. The \fB\s-1DER\s0\fR option uses an \s-1ASN.1 DER\s0 encoded
form compatible with \s-1RFC 3279\s0 EcpkParameters. The \s-1PEM\s0 form is the default
format: it consists of the \fB\s-1DER\s0\fR format base64 encoded with additional 
header and footer lines.
.IP &quot;\fB\-outform DER|PEM\fR&quot; 4
.IX Item &quot;-outform DER|PEM&quot;
This specifies the output format, the options have the same meaning as the 
\&amp;\fB\-inform\fR option.
.IP &quot;\fB\-in filename\fR&quot; 4
.IX Item &quot;-in filename&quot;
This specifies the input filename to read parameters from or standard input if
this option is not specified.
.IP &quot;\fB\-out filename\fR&quot; 4
.IX Item &quot;-out filename&quot;
This specifies the output filename parameters to. Standard output is used
if this option is not present. The output filename should \fBnot\fR be the same
as the input filename.
.IP &quot;\fB\-noout\fR&quot; 4
.IX Item &quot;-noout&quot;
This option inhibits the output of the encoded version of the parameters.
.IP &quot;\fB\-text\fR&quot; 4
.IX Item &quot;-text&quot;
This option prints out the \s-1EC\s0 parameters in human readable form.
.IP &quot;\fB\-C\fR&quot; 4
.IX Item &quot;-C&quot;
This option converts the \s-1EC\s0 parameters into C code. The parameters can then
be loaded by calling the \fB\fBget_ec_group_XXX()\fB\fR function.
.IP &quot;\fB\-check\fR&quot; 4
.IX Item &quot;-check&quot;
Validate the elliptic curve parameters.
.IP &quot;\fB\-name arg\fR&quot; 4
.IX Item &quot;-name arg&quot;
Use the \s-1EC\s0 parameters with the specified 'short' name. Use \fB\-list_curves\fR
to get a list of all currently implemented \s-1EC\s0 parameters.
.IP &quot;\fB\-list_curves\fR&quot; 4
.IX Item &quot;-list_curves&quot;
If this options is specified \fBecparam\fR will print out a list of all
currently implemented \s-1EC\s0 parameters names and exit.
.IP &quot;\fB\-conv_form\fR&quot; 4
.IX Item &quot;-conv_form&quot;
This specifies how the points on the elliptic curve are converted
into octet strings. Possible values are: \fBcompressed\fR, \fBuncompressed\fR (the
default value) and \fBhybrid\fR. For more information regarding
the point conversion forms please read the X9.62 standard.
\&amp;\fBNote\fR Due to patent issues the \fBcompressed\fR option is disabled
by default for binary curves and can be enabled by defining
the preprocessor macro \fB\s-1OPENSSL_EC_BIN_PT_COMP\s0\fR at compile time.
.IP &quot;\fB\-param_enc arg\fR&quot; 4
.IX Item &quot;-param_enc arg&quot;
This specifies how the elliptic curve parameters are encoded.
Possible value are: \fBnamed_curve\fR, i.e. the ec parameters are
specified by a \s-1OID,\s0 or \fBexplicit\fR where the ec parameters are
explicitly given (see \s-1RFC 3279\s0 for the definition of the 
\&amp;\s-1EC\s0 parameters structures). The default value is \fBnamed_curve\fR.
\&amp;\fBNote\fR the \fBimplicitlyCA\fR alternative ,as specified in \s-1RFC 3279,\s0
is currently not implemented in OpenSSL.
.IP &quot;\fB\-no_seed\fR&quot; 4
.IX Item &quot;-no_seed&quot;
This option inhibits that the 'seed' for the parameter generation
is included in the ECParameters structure (see \s-1RFC 3279\s0).
.IP &quot;\fB\-genkey\fR&quot; 4
.IX Item &quot;-genkey&quot;
This option will generate a \s-1EC\s0 private key using the specified parameters.
.IP &quot;\fB\-rand file(s)\fR&quot; 4
.IX Item &quot;-rand file(s)&quot;
a file or files containing random data used to seed the random number
generator, or an \s-1EGD\s0 socket (see \fBRAND_egd\fR\|(3)).
Multiple files can be specified separated by a OS-dependent character.
The separator is \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
all others.
.IP &quot;\fB\-engine id\fR&quot; 4
.IX Item &quot;-engine id&quot;
specifying an engine (by its unique \fBid\fR string) will cause \fBecparam\fR
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.
.SH &quot;NOTES&quot;
.IX Header &quot;NOTES&quot;
\&amp;\s-1PEM\s0 format \s-1EC\s0 parameters use the header and footer lines:
.PP
.Vb 2
\&amp; \-\-\-\-\-BEGIN EC PARAMETERS\-\-\-\-\-
\&amp; \-\-\-\-\-END EC PARAMETERS\-\-\-\-\-
.Ve
.PP
OpenSSL is currently not able to generate new groups and therefore
\&amp;\fBecparam\fR can only create \s-1EC\s0 parameters from known (named) curves.
.SH &quot;EXAMPLES&quot;
.IX Header &quot;EXAMPLES&quot;
To create \s-1EC\s0 parameters with the group 'prime192v1':
.PP
.Vb 1
\&amp;  openssl ecparam \-out ec_param.pem \-name prime192v1
.Ve
.PP
To create \s-1EC\s0 parameters with explicit parameters:
.PP
.Vb 1
\&amp;  openssl ecparam \-out ec_param.pem \-name prime192v1 \-param_enc explicit
.Ve
.PP
To validate given \s-1EC\s0 parameters:
.PP
.Vb 1
\&amp;  openssl ecparam \-in ec_param.pem \-check
.Ve
.PP
To create \s-1EC\s0 parameters and a private key:
.PP
.Vb 1
\&amp;  openssl ecparam \-out ec_key.pem \-name prime192v1 \-genkey
.Ve
.PP
To change the point encoding to 'compressed':
.PP
.Vb 1
\&amp;  openssl ecparam \-in ec_in.pem \-out ec_out.pem \-conv_form compressed
.Ve
.PP
To print out the \s-1EC\s0 parameters to standard output:
.PP
.Vb 1
\&amp;  openssl ecparam \-in ec_param.pem \-noout \-text
.Ve
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBec\fR\|(1), \fBdsaparam\fR\|(1)
.SH &quot;HISTORY&quot;
.IX Header &quot;HISTORY&quot;
The ecparam command was first introduced in OpenSSL 0.9.8.
.SH &quot;AUTHOR&quot;
.IX Header &quot;AUTHOR&quot;
Nils Larsch for the OpenSSL project (http://www.openssl.org)
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