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| 129 | .\" ======================================================================== |
| 130 | .\" |
| 131 | .IX Title "ECPARAM 1" |
| 132 | .TH ECPARAM 1 "2008-09-06" "0.9.8h" "OpenSSL" |
| 133 | .SH "NAME" |
| 134 | ecparam \- EC parameter manipulation and generation |
| 135 | .SH "SYNOPSIS" |
| 136 | .IX Header "SYNOPSIS" |
| 137 | \&\fBopenssl ecparam\fR |
| 138 | [\fB\-inform DER|PEM\fR] |
| 139 | [\fB\-outform DER|PEM\fR] |
| 140 | [\fB\-in filename\fR] |
| 141 | [\fB\-out filename\fR] |
| 142 | [\fB\-noout\fR] |
| 143 | [\fB\-text\fR] |
| 144 | [\fB\-C\fR] |
| 145 | [\fB\-check\fR] |
| 146 | [\fB\-name arg\fR] |
| 147 | [\fB\-list_curve\fR] |
| 148 | [\fB\-conv_form arg\fR] |
| 149 | [\fB\-param_enc arg\fR] |
| 150 | [\fB\-no_seed\fR] |
| 151 | [\fB\-rand file(s)\fR] |
| 152 | [\fB\-genkey\fR] |
| 153 | [\fB\-engine id\fR] |
| 154 | .SH "DESCRIPTION" |
| 155 | .IX Header "DESCRIPTION" |
| 156 | This command is used to manipulate or generate \s-1EC\s0 parameter files. |
| 157 | .SH "OPTIONS" |
| 158 | .IX Header "OPTIONS" |
| 159 | .IP "\fB\-inform DER|PEM\fR" 4 |
| 160 | .IX Item "-inform DER|PEM" |
| 161 | This specifies the input format. The \fB\s-1DER\s0\fR option uses an \s-1ASN\s0.1 \s-1DER\s0 encoded |
| 162 | form compatible with \s-1RFC\s0 3279 EcpkParameters. The \s-1PEM\s0 form is the default |
| 163 | format: it consists of the \fB\s-1DER\s0\fR format base64 encoded with additional |
| 164 | header and footer lines. |
| 165 | .IP "\fB\-outform DER|PEM\fR" 4 |
| 166 | .IX Item "-outform DER|PEM" |
| 167 | This specifies the output format, the options have the same meaning as the |
| 168 | \&\fB\-inform\fR option. |
| 169 | .IP "\fB\-in filename\fR" 4 |
| 170 | .IX Item "-in filename" |
| 171 | This specifies the input filename to read parameters from or standard input if |
| 172 | this option is not specified. |
| 173 | .IP "\fB\-out filename\fR" 4 |
| 174 | .IX Item "-out filename" |
| 175 | This specifies the output filename parameters to. Standard output is used |
| 176 | if this option is not present. The output filename should \fBnot\fR be the same |
| 177 | as the input filename. |
| 178 | .IP "\fB\-noout\fR" 4 |
| 179 | .IX Item "-noout" |
| 180 | This option inhibits the output of the encoded version of the parameters. |
| 181 | .IP "\fB\-text\fR" 4 |
| 182 | .IX Item "-text" |
| 183 | This option prints out the \s-1EC\s0 parameters in human readable form. |
| 184 | .IP "\fB\-C\fR" 4 |
| 185 | .IX Item "-C" |
| 186 | This option converts the \s-1EC\s0 parameters into C code. The parameters can then |
| 187 | be loaded by calling the \fB\f(BIget_ec_group_XXX()\fB\fR function. |
| 188 | .IP "\fB\-check\fR" 4 |
| 189 | .IX Item "-check" |
| 190 | Validate the elliptic curve parameters. |
| 191 | .IP "\fB\-name arg\fR" 4 |
| 192 | .IX Item "-name arg" |
| 193 | Use the \s-1EC\s0 parameters with the specified 'short' name. Use \fB\-list_curves\fR |
| 194 | to get a list of all currently implemented \s-1EC\s0 parameters. |
| 195 | .IP "\fB\-list_curves\fR" 4 |
| 196 | .IX Item "-list_curves" |
| 197 | If this options is specified \fBecparam\fR will print out a list of all |
| 198 | currently implemented \s-1EC\s0 parameters names and exit. |
| 199 | .IP "\fB\-conv_form\fR" 4 |
| 200 | .IX Item "-conv_form" |
| 201 | This specifies how the points on the elliptic curve are converted |
| 202 | into octet strings. Possible values are: \fBcompressed\fR (the default |
| 203 | value), \fBuncompressed\fR and \fBhybrid\fR. For more information regarding |
| 204 | the point conversion forms please read the X9.62 standard. |
| 205 | \&\fBNote\fR Due to patent issues the \fBcompressed\fR option is disabled |
| 206 | by default for binary curves and can be enabled by defining |
| 207 | the preprocessor macro \fB\s-1OPENSSL_EC_BIN_PT_COMP\s0\fR at compile time. |
| 208 | .IP "\fB\-param_enc arg\fR" 4 |
| 209 | .IX Item "-param_enc arg" |
| 210 | This specifies how the elliptic curve parameters are encoded. |
| 211 | Possible value are: \fBnamed_curve\fR, i.e. the ec parameters are |
| 212 | specified by a \s-1OID\s0, or \fBexplicit\fR where the ec parameters are |
| 213 | explicitly given (see \s-1RFC\s0 3279 for the definition of the |
| 214 | \&\s-1EC\s0 parameters structures). The default value is \fBnamed_curve\fR. |
| 215 | \&\fBNote\fR the \fBimplicitlyCA\fR alternative ,as specified in \s-1RFC\s0 3279, |
| 216 | is currently not implemented in OpenSSL. |
| 217 | .IP "\fB\-no_seed\fR" 4 |
| 218 | .IX Item "-no_seed" |
| 219 | This option inhibits that the 'seed' for the parameter generation |
| 220 | is included in the ECParameters structure (see \s-1RFC\s0 3279). |
| 221 | .IP "\fB\-genkey\fR" 4 |
| 222 | .IX Item "-genkey" |
| 223 | This option will generate a \s-1EC\s0 private key using the specified parameters. |
| 224 | .IP "\fB\-rand file(s)\fR" 4 |
| 225 | .IX Item "-rand file(s)" |
| 226 | a file or files containing random data used to seed the random number |
| 227 | generator, or an \s-1EGD\s0 socket (see \fIRAND_egd\fR\|(3)). |
| 228 | Multiple files can be specified separated by a OS-dependent character. |
| 229 | The separator is \fB;\fR for MS\-Windows, \fB,\fR for OpenVMS, and \fB:\fR for |
| 230 | all others. |
| 231 | .IP "\fB\-engine id\fR" 4 |
| 232 | .IX Item "-engine id" |
| 233 | specifying an engine (by it's unique \fBid\fR string) will cause \fBreq\fR |
| 234 | to attempt to obtain a functional reference to the specified engine, |
| 235 | thus initialising it if needed. The engine will then be set as the default |
| 236 | for all available algorithms. |
| 237 | .SH "NOTES" |
| 238 | .IX Header "NOTES" |
| 239 | \&\s-1PEM\s0 format \s-1EC\s0 parameters use the header and footer lines: |
| 240 | .PP |
| 241 | .Vb 2 |
| 242 | \& -----BEGIN EC PARAMETERS----- |
| 243 | \& -----END EC PARAMETERS----- |
| 244 | .Ve |
| 245 | .PP |
| 246 | OpenSSL is currently not able to generate new groups and therefore |
| 247 | \&\fBecparam\fR can only create \s-1EC\s0 parameters from known (named) curves. |
| 248 | .SH "EXAMPLES" |
| 249 | .IX Header "EXAMPLES" |
| 250 | To create \s-1EC\s0 parameters with the group 'prime192v1': |
| 251 | .PP |
| 252 | .Vb 1 |
| 253 | \& openssl ecparam -out ec_param.pem -name prime192v1 |
| 254 | .Ve |
| 255 | .PP |
| 256 | To create \s-1EC\s0 parameters with explicit parameters: |
| 257 | .PP |
| 258 | .Vb 1 |
| 259 | \& openssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit |
| 260 | .Ve |
| 261 | .PP |
| 262 | To validate given \s-1EC\s0 parameters: |
| 263 | .PP |
| 264 | .Vb 1 |
| 265 | \& openssl ecparam -in ec_param.pem -check |
| 266 | .Ve |
| 267 | .PP |
| 268 | To create \s-1EC\s0 parameters and a private key: |
| 269 | .PP |
| 270 | .Vb 1 |
| 271 | \& openssl ecparam -out ec_key.pem -name prime192v1 -genkey |
| 272 | .Ve |
| 273 | .PP |
| 274 | To change the point encoding to 'compressed': |
| 275 | .PP |
| 276 | .Vb 1 |
| 277 | \& openssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed |
| 278 | .Ve |
| 279 | .PP |
| 280 | To print out the \s-1EC\s0 parameters to standard output: |
| 281 | .PP |
| 282 | .Vb 1 |
| 283 | \& openssl ecparam -in ec_param.pem -noout -text |
| 284 | .Ve |
| 285 | .SH "SEE ALSO" |
| 286 | .IX Header "SEE ALSO" |
| 287 | \&\fIec\fR\|(1), \fIdsaparam\fR\|(1) |
| 288 | .SH "HISTORY" |
| 289 | .IX Header "HISTORY" |
| 290 | The ecparam command was first introduced in OpenSSL 0.9.8. |
| 291 | .SH "AUTHOR" |
| 292 | .IX Header "AUTHOR" |
| 293 | Nils Larsch for the OpenSSL project (http://www.openssl.org) |