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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" openssl\-ecparam \- EC parameter manipulation and generation .SH "SYNOPSIS" .IX Header "SYNOPSIS" \&\fBopenssl ecparam\fR [\fB\-help\fR] [\fB\-inform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR] [\fB\-outform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR] [\fB\-in\fR \fIfilename\fR] [\fB\-out\fR \fIfilename\fR] [\fB\-noout\fR] [\fB\-text\fR] [\fB\-C\fR] [\fB\-check\fR] [\fB\-check_named\fR] [\fB\-name\fR \fIarg\fR] [\fB\-list_curves\fR] [\fB\-conv_form\fR \fIarg\fR] [\fB\-param_enc\fR \fIarg\fR] [\fB\-no_seed\fR] [\fB\-genkey\fR] [\fB\-engine\fR \fIid\fR] [\fB\-rand\fR \fIfiles\fR] [\fB\-writerand\fR \fIfile\fR] .SH "DESCRIPTION" .IX Header "DESCRIPTION" This command has been deprecated. The \fIopenssl\-genpkey\fR\|(1) and \fIopenssl\-pkeyparam\fR\|(1) commands should be used instead. .PP This command is used to manipulate or generate \s-1EC\s0 parameter files. .PP OpenSSL is currently not able to generate new groups and therefore this command can only create \s-1EC\s0 parameters from known (named) curves. .SH "OPTIONS" .IX Header "OPTIONS" .IP "\fB\-help\fR" 4 .IX Item "-help" Print out a usage message. .IP "\fB\-inform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR, \fB\-outform\fR \fB\s-1DER\s0\fR|\fB\s-1PEM\s0\fR" 4 .IX Item "-inform DER|PEM, -outform DER|PEM" The input and formats; the default is \fB\s-1PEM\s0\fR. See \*(L"Format Options\*(R" in \fIopenssl\fR\|(1) for details. .Sp Parameters are encoded as \fBEcpkParameters\fR as specified in \s-1IETF\s0 \s-1RFC\s0 3279. .IP "\fB\-in\fR \fIfilename\fR" 4 .IX Item "-in filename" This specifies the input filename to read parameters from or standard input if this option is not specified. .IP "\fB\-out\fR \fIfilename\fR" 4 .IX Item "-out filename" 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 "\fB\-noout\fR" 4 .IX Item "-noout" This option inhibits the output of the encoded version of the parameters. .IP "\fB\-text\fR" 4 .IX Item "-text" This option prints out the \s-1EC\s0 parameters in human readable form. .IP "\fB\-C\fR" 4 .IX Item "-C" This option converts the \s-1EC\s0 parameters into C code. The parameters can then be loaded by calling the \fIget_ec_group_XXX()\fR function. .IP "\fB\-check\fR" 4 .IX Item "-check" Validate the elliptic curve parameters. .IP "\fB\-check_named\fR" 4 .IX Item "-check_named" Validate the elliptic name curve parameters by checking if the curve parameters match any built-in curves. .IP "\fB\-name\fR \fIarg\fR" 4 .IX Item "-name arg" 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 "\fB\-list_curves\fR" 4 .IX Item "-list_curves" Print out a list of all currently implemented \s-1EC\s0 parameters names and exit. .IP "\fB\-conv_form\fR \fIarg\fR" 4 .IX Item "-conv_form arg" 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. \&\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 "\fB\-param_enc\fR \fIarg\fR" 4 .IX Item "-param_enc arg" This specifies how the elliptic curve parameters are encoded. Possible value are: \fBnamed_curve\fR, i.e. the ec parameters are specified by an \s-1OID\s0, or \fBexplicit\fR where the ec parameters are explicitly given (see \s-1RFC\s0 3279 for the definition of the \&\s-1EC\s0 parameters structures). The default value is \fBnamed_curve\fR. \&\fBNote\fR the \fBimplicitlyCA\fR alternative, as specified in \s-1RFC\s0 3279, is currently not implemented in OpenSSL. .IP "\fB\-no_seed\fR" 4 .IX Item "-no_seed" This option inhibits that the 'seed' for the parameter generation is included in the ECParameters structure (see \s-1RFC\s0 3279). .IP "\fB\-genkey\fR" 4 .IX Item "-genkey" This option will generate an \s-1EC\s0 private key using the specified parameters. .IP "\fB\-engine\fR \fIid\fR" 4 .IX Item "-engine id" See \*(L"Engine Options\*(R" in \fIopenssl\fR\|(1). .IP "\fB\-rand\fR \fIfiles\fR, \fB\-writerand\fR \fIfile\fR" 4 .IX Item "-rand files, -writerand file" See \*(L"Random State Options\*(R" in \fIopenssl\fR\|(1) for details. .SH "EXAMPLES" .IX Header "EXAMPLES" Examples equivalent to these can be found in the documentation for the non-deprecated \fIopenssl\-genpkey\fR\|(1) and \fIopenssl\-pkeyparam\fR\|(1) commands. .PP To create \s-1EC\s0 parameters with the group 'prime192v1': .PP .Vb 1 \& openssl ecparam \-out ec_param.pem \-name prime192v1 .Ve .PP To create \s-1EC\s0 parameters with explicit parameters: .PP .Vb 1 \& openssl ecparam \-out ec_param.pem \-name prime192v1 \-param_enc explicit .Ve .PP To validate given \s-1EC\s0 parameters: .PP .Vb 1 \& openssl ecparam \-in ec_param.pem \-check .Ve .PP To create \s-1EC\s0 parameters and a private key: .PP .Vb 1 \& openssl ecparam \-out ec_key.pem \-name prime192v1 \-genkey .Ve .PP To change the point encoding to 'compressed': .PP .Vb 1 \& 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 \& openssl ecparam \-in ec_param.pem \-noout \-text .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIopenssl\fR\|(1), \&\fIopenssl\-pkeyparam\fR\|(1), \&\fIopenssl\-genpkey\fR\|(1), \&\fIopenssl\-ec\fR\|(1), \&\fIopenssl\-dsaparam\fR\|(1) .SH "HISTORY" .IX Header "HISTORY" This command was deprecated in OpenSSL 3.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2003\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at .