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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, ecparam \- EC parameter manipulation and generation .SH "SYNOPSIS" .IX Header "SYNOPSIS" \&\fBopenssl ecparam\fR [\fB\-help\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...\fR] [\fB\-writerand file\fR] [\fB\-genkey\fR] [\fB\-engine id\fR] .SH "DESCRIPTION" .IX Header "DESCRIPTION" This command is used to manipulate or generate \s-1EC\s0 parameter files. .SH "OPTIONS" .IX Header "OPTIONS" .IP "\fB\-help\fR" 4 .IX Item "-help" Print out a usage message. .IP "\fB\-inform DER|PEM\fR" 4 .IX Item "-inform DER|PEM" 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 "\fB\-outform DER|PEM\fR" 4 .IX Item "-outform DER|PEM" This specifies the output format, the options have the same meaning and default as the \fB\-inform\fR option. .IP "\fB\-in filename\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 filename\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\-name arg\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" If this options is specified \fBecparam\fR will print out a list of all currently implemented \s-1EC\s0 parameters names and exit. .IP "\fB\-conv_form\fR" 4 .IX Item "-conv_form" 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 arg\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 3279\s0 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 3279,\s0 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 3279\s0). .IP "\fB\-genkey\fR" 4 .IX Item "-genkey" This option will generate an \s-1EC\s0 private key using the specified parameters. .IP "\fB\-rand file...\fR" 4 .IX Item "-rand file..." A file or files containing random data used to seed the random number generator. Multiple files can be specified separated by an OS-dependent character. The separator is \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for all others. .IP "[\fB\-writerand file\fR]" 4 .IX Item "[-writerand file]" Writes random data to the specified \fIfile\fR upon exit. This can be used with a subsequent \fB\-rand\fR flag. .IP "\fB\-engine id\fR" 4 .IX Item "-engine id" 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 "NOTES" .IX Header "NOTES" \&\s-1PEM\s0 format \s-1EC\s0 parameters use the header and footer lines: .PP .Vb 2 \& \-\-\-\-\-BEGIN EC PARAMETERS\-\-\-\-\- \& \-\-\-\-\-END EC PARAMETERS\-\-\-\-\- .Ve .PP OpenSSL is currently not able to generate new groups and therefore \&\fBecparam\fR can only create \s-1EC\s0 parameters from known (named) curves. .SH "EXAMPLES" .IX Header "EXAMPLES" 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" \&\fIec\fR\|(1), \fIdsaparam\fR\|(1) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2003\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (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 <https://www.openssl.org/source/license.html>.