294 lines
9.3 KiB
Groff
294 lines
9.3 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "ECPARAM 1"
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.TH ECPARAM 1 "2007-03-15" "0.9.8e" "OpenSSL"
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.SH "NAME"
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ecparam \- EC parameter manipulation and generation
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl ecparam\fR
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[\fB\-inform DER|PEM\fR]
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[\fB\-outform DER|PEM\fR]
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[\fB\-in filename\fR]
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[\fB\-out filename\fR]
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[\fB\-noout\fR]
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[\fB\-text\fR]
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[\fB\-C\fR]
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[\fB\-check\fR]
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[\fB\-name arg\fR]
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[\fB\-list_curve\fR]
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[\fB\-conv_form arg\fR]
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[\fB\-param_enc arg\fR]
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[\fB\-no_seed\fR]
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[\fB\-rand file(s)\fR]
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[\fB\-genkey\fR]
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[\fB\-engine id\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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This command is used to manipulate or generate \s-1EC\s0 parameter files.
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.IP "\fB\-inform DER|PEM\fR" 4
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.IX Item "-inform DER|PEM"
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This specifies the input format. The \fB\s-1DER\s0\fR option uses an \s-1ASN\s0.1 \s-1DER\s0 encoded
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form compatible with \s-1RFC\s0 3279 EcpkParameters. The \s-1PEM\s0 form is the default
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format: it consists of the \fB\s-1DER\s0\fR format base64 encoded with additional
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header and footer lines.
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.IP "\fB\-outform DER|PEM\fR" 4
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.IX Item "-outform DER|PEM"
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This specifies the output format, the options have the same meaning as the
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\&\fB\-inform\fR option.
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.IP "\fB\-in filename\fR" 4
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.IX Item "-in filename"
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This specifies the input filename to read parameters from or standard input if
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this option is not specified.
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.IP "\fB\-out filename\fR" 4
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.IX Item "-out filename"
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This specifies the output filename parameters to. Standard output is used
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if this option is not present. The output filename should \fBnot\fR be the same
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as the input filename.
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.IP "\fB\-noout\fR" 4
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.IX Item "-noout"
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This option inhibits the output of the encoded version of the parameters.
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.IP "\fB\-text\fR" 4
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.IX Item "-text"
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This option prints out the \s-1EC\s0 parameters in human readable form.
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.IP "\fB\-C\fR" 4
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.IX Item "-C"
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This option converts the \s-1EC\s0 parameters into C code. The parameters can then
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be loaded by calling the \fB\f(BIget_ec_group_XXX()\fB\fR function.
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.IP "\fB\-check\fR" 4
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.IX Item "-check"
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Validate the elliptic curve parameters.
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.IP "\fB\-name arg\fR" 4
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.IX Item "-name arg"
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Use the \s-1EC\s0 parameters with the specified 'short' name. Use \fB\-list_curves\fR
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to get a list of all currently implemented \s-1EC\s0 parameters.
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.IP "\fB\-list_curves\fR" 4
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.IX Item "-list_curves"
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If this options is specified \fBecparam\fR will print out a list of all
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currently implemented \s-1EC\s0 parameters names and exit.
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.IP "\fB\-conv_form\fR" 4
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.IX Item "-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: \fBcompressed\fR (the default
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value), \fBuncompressed\fR and \fBhybrid\fR. For more information regarding
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the point conversion forms please read the X9.62 standard.
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\&\fBNote\fR Due to patent issues the \fBcompressed\fR 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 \fB\s-1OPENSSL_EC_BIN_PT_COMP\s0\fR at compile time.
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.IP "\fB\-param_enc arg\fR" 4
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.IX Item "-param_enc arg"
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This specifies how the elliptic curve parameters are encoded.
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Possible value are: \fBnamed_curve\fR, i.e. the ec parameters are
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specified by a \s-1OID\s0, or \fBexplicit\fR where the ec parameters are
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explicitly given (see \s-1RFC\s0 3279 for the definition of the
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\&\s-1EC\s0 parameters structures). The default value is \fBnamed_curve\fR.
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\&\fBNote\fR the \fBimplicitlyCA\fR alternative ,as specified in \s-1RFC\s0 3279,
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is currently not implemented in OpenSSL.
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.IP "\fB\-no_seed\fR" 4
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.IX Item "-no_seed"
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This option inhibits that the 'seed' for the parameter generation
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is included in the ECParameters structure (see \s-1RFC\s0 3279).
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.IP "\fB\-genkey\fR" 4
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.IX Item "-genkey"
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This option will generate a \s-1EC\s0 private key using the specified parameters.
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.IP "\fB\-rand file(s)\fR" 4
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.IX Item "-rand file(s)"
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a file or files containing random data used to seed the random number
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generator, or an \s-1EGD\s0 socket (see \fIRAND_egd\fR\|(3)).
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Multiple files can be specified separated by a OS-dependent character.
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The separator is \fB;\fR for MS\-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
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all others.
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.IP "\fB\-engine id\fR" 4
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.IX Item "-engine id"
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specifying an engine (by it's unique \fBid\fR string) will cause \fBreq\fR
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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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.SH "NOTES"
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.IX Header "NOTES"
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\&\s-1PEM\s0 format \s-1EC\s0 parameters use the header and footer lines:
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.PP
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.Vb 2
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\& -----BEGIN EC PARAMETERS-----
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\& -----END EC PARAMETERS-----
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.Ve
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.PP
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OpenSSL is currently not able to generate new groups and therefore
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\&\fBecparam\fR can only create \s-1EC\s0 parameters from known (named) curves.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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To create \s-1EC\s0 parameters with the group 'prime192v1':
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.PP
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.Vb 1
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\& openssl ecparam -out ec_param.pem -name prime192v1
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.Ve
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.PP
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To create \s-1EC\s0 parameters with explicit parameters:
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.PP
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.Vb 1
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\& openssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit
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.Ve
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.PP
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To validate given \s-1EC\s0 parameters:
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.PP
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.Vb 1
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\& openssl ecparam -in ec_param.pem -check
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.Ve
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.PP
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To create \s-1EC\s0 parameters and a private key:
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.PP
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.Vb 1
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\& openssl ecparam -out ec_key.pem -name prime192v1 -genkey
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.Ve
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.PP
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To change the point encoding to 'compressed':
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.PP
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.Vb 1
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\& openssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed
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.Ve
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.PP
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To print out the \s-1EC\s0 parameters to standard output:
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.PP
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.Vb 1
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\& openssl ecparam -in ec_param.pem -noout -text
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIec\fR\|(1), \fIdsaparam\fR\|(1)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The ecparam command was first introduced in OpenSSL 0.9.8.
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.SH "AUTHOR"
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.IX Header "AUTHOR"
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Nils Larsch for the OpenSSL project (http://www.openssl.org)
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