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1 | =pod |
2 | ||
3 | =head1 NAME | |
4 | ||
3f2181e6 | 5 | openssl-ecparam, |
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6 | ecparam - EC parameter manipulation and generation |
7 | ||
8 | =head1 SYNOPSIS | |
9 | ||
10 | B<openssl ecparam> | |
169394d4 | 11 | [B<-help>] |
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12 | [B<-inform DER|PEM>] |
13 | [B<-outform DER|PEM>] | |
14 | [B<-in filename>] | |
15 | [B<-out filename>] | |
16 | [B<-noout>] | |
17 | [B<-text>] | |
18 | [B<-C>] | |
19 | [B<-check>] | |
20 | [B<-name arg>] | |
fc1d88f0 | 21 | [B<-list_curves>] |
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22 | [B<-conv_form arg>] |
23 | [B<-param_enc arg>] | |
24 | [B<-no_seed>] | |
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25 | [B<-rand file...>] |
26 | [B<-writerand file>] | |
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27 | [B<-genkey>] |
28 | [B<-engine id>] | |
29 | ||
30 | =head1 DESCRIPTION | |
31 | ||
32 | This command is used to manipulate or generate EC parameter files. | |
33 | ||
34 | =head1 OPTIONS | |
35 | ||
36 | =over 4 | |
37 | ||
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38 | =item B<-help> |
39 | ||
40 | Print out a usage message. | |
41 | ||
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42 | =item B<-inform DER|PEM> |
43 | ||
44 | This specifies the input format. The B<DER> option uses an ASN.1 DER encoded | |
45 | form compatible with RFC 3279 EcpkParameters. The PEM form is the default | |
1bc74519 | 46 | format: it consists of the B<DER> format base64 encoded with additional |
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47 | header and footer lines. |
48 | ||
49 | =item B<-outform DER|PEM> | |
50 | ||
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51 | This specifies the output format, the options have the same meaning and default |
52 | as the B<-inform> option. | |
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53 | |
54 | =item B<-in filename> | |
55 | ||
56 | This specifies the input filename to read parameters from or standard input if | |
57 | this option is not specified. | |
58 | ||
59 | =item B<-out filename> | |
60 | ||
61 | This specifies the output filename parameters to. Standard output is used | |
62 | if this option is not present. The output filename should B<not> be the same | |
63 | as the input filename. | |
64 | ||
65 | =item B<-noout> | |
66 | ||
67 | This option inhibits the output of the encoded version of the parameters. | |
68 | ||
69 | =item B<-text> | |
70 | ||
71 | This option prints out the EC parameters in human readable form. | |
72 | ||
73 | =item B<-C> | |
74 | ||
75 | This option converts the EC parameters into C code. The parameters can then | |
35cb565a | 76 | be loaded by calling the get_ec_group_XXX() function. |
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77 | |
78 | =item B<-check> | |
79 | ||
80 | Validate the elliptic curve parameters. | |
81 | ||
82 | =item B<-name arg> | |
83 | ||
84 | Use the EC parameters with the specified 'short' name. Use B<-list_curves> | |
85 | to get a list of all currently implemented EC parameters. | |
86 | ||
87 | =item B<-list_curves> | |
88 | ||
89 | If this options is specified B<ecparam> will print out a list of all | |
90 | currently implemented EC parameters names and exit. | |
91 | ||
92 | =item B<-conv_form> | |
93 | ||
94 | This specifies how the points on the elliptic curve are converted | |
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95 | into octet strings. Possible values are: B<compressed>, B<uncompressed> (the |
96 | default value) and B<hybrid>. For more information regarding | |
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97 | the point conversion forms please read the X9.62 standard. |
98 | B<Note> Due to patent issues the B<compressed> option is disabled | |
99 | by default for binary curves and can be enabled by defining | |
100 | the preprocessor macro B<OPENSSL_EC_BIN_PT_COMP> at compile time. | |
101 | ||
102 | =item B<-param_enc arg> | |
103 | ||
104 | This specifies how the elliptic curve parameters are encoded. | |
105 | Possible value are: B<named_curve>, i.e. the ec parameters are | |
35ed393e | 106 | specified by an OID, or B<explicit> where the ec parameters are |
1bc74519 | 107 | explicitly given (see RFC 3279 for the definition of the |
2c789c82 | 108 | EC parameters structures). The default value is B<named_curve>. |
aebb9aac | 109 | B<Note> the B<implicitlyCA> alternative, as specified in RFC 3279, |
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110 | is currently not implemented in OpenSSL. |
111 | ||
112 | =item B<-no_seed> | |
113 | ||
114 | This option inhibits that the 'seed' for the parameter generation | |
115 | is included in the ECParameters structure (see RFC 3279). | |
116 | ||
117 | =item B<-genkey> | |
118 | ||
35ed393e | 119 | This option will generate an EC private key using the specified parameters. |
2c789c82 | 120 | |
3ee1eac2 | 121 | =item B<-rand file...> |
2c789c82 | 122 | |
c4de074e | 123 | A file or files containing random data used to seed the random number |
3ee1eac2 | 124 | generator. |
35ed393e | 125 | Multiple files can be specified separated by an OS-dependent character. |
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126 | The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for |
127 | all others. | |
128 | ||
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129 | =item [B<-writerand file>] |
130 | ||
131 | Writes random data to the specified I<file> upon exit. | |
132 | This can be used with a subsequent B<-rand> flag. | |
133 | ||
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134 | =item B<-engine id> |
135 | ||
c4de074e | 136 | Specifying an engine (by its unique B<id> string) will cause B<ecparam> |
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137 | to attempt to obtain a functional reference to the specified engine, |
138 | thus initialising it if needed. The engine will then be set as the default | |
139 | for all available algorithms. | |
140 | ||
141 | =back | |
142 | ||
143 | =head1 NOTES | |
144 | ||
145 | PEM format EC parameters use the header and footer lines: | |
146 | ||
147 | -----BEGIN EC PARAMETERS----- | |
148 | -----END EC PARAMETERS----- | |
149 | ||
150 | OpenSSL is currently not able to generate new groups and therefore | |
1bc74519 | 151 | B<ecparam> can only create EC parameters from known (named) curves. |
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152 | |
153 | =head1 EXAMPLES | |
154 | ||
155 | To create EC parameters with the group 'prime192v1': | |
156 | ||
627bd670 | 157 | openssl ecparam -out ec_param.pem -name prime192v1 |
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158 | |
159 | To create EC parameters with explicit parameters: | |
160 | ||
627bd670 | 161 | openssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit |
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162 | |
163 | To validate given EC parameters: | |
164 | ||
627bd670 | 165 | openssl ecparam -in ec_param.pem -check |
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166 | |
167 | To create EC parameters and a private key: | |
168 | ||
627bd670 | 169 | openssl ecparam -out ec_key.pem -name prime192v1 -genkey |
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170 | |
171 | To change the point encoding to 'compressed': | |
172 | ||
627bd670 | 173 | openssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed |
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174 | |
175 | To print out the EC parameters to standard output: | |
176 | ||
627bd670 | 177 | openssl ecparam -in ec_param.pem -noout -text |
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178 | |
179 | =head1 SEE ALSO | |
180 | ||
9b86974e | 181 | L<ec(1)>, L<dsaparam(1)> |
2c789c82 | 182 | |
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183 | =head1 COPYRIGHT |
184 | ||
c4d3c19b | 185 | Copyright 2003-2018 The OpenSSL Project Authors. All Rights Reserved. |
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186 | |
187 | Licensed under the OpenSSL license (the "License"). You may not use | |
188 | this file except in compliance with the License. You can obtain a copy | |
189 | in the file LICENSE in the source distribution or at | |
190 | L<https://www.openssl.org/source/license.html>. | |
191 | ||
192 | =cut |