d03ab969 |
1 | .\" -*-nroff-*- |
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2 | .ie t \{\ |
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3 | . if \n(.g \{\ |
4 | . fam P |
5 | . \} |
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6 | . ds ss \s8\u |
7 | . ds se \d\s0 |
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8 | . ds us \s8\d |
9 | . ds ue \u\s0 |
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10 | . ds *b \(*b |
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11 | .\} |
12 | .el \{\ |
13 | . ds ss ^ |
14 | . ds se |
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15 | . ds us _ |
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16 | . ds ue |
17 | . ds *b \fIbeta\fP |
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18 | .\} |
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19 | .TH key 1 "5 June 1999" "Straylight/Edgeware" "Catacomb cryptographic library" |
d03ab969 |
20 | .SH NAME |
21 | key \- simple key management system |
22 | .SH SYNOPSIS |
23 | .B key |
24 | .RB [ \-k |
25 | .IR keyring ] |
26 | .I command |
27 | .PP |
28 | where |
29 | .I command |
30 | is one of: |
31 | .PP |
32 | .B add |
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33 | .RB [ \-lqrLS ] |
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34 | .RB [ \-a |
35 | .IR alg ] |
36 | .RB [ \-b | \-B |
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37 | .IR bits ] |
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38 | .RB [ \-p |
39 | .IR param ] |
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40 | .RB [ \-R |
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41 | .IR tag ] |
42 | .br |
43 | \h'8n' |
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44 | .RB [ \-e |
45 | .IR expire ] |
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46 | .RB [ \-t |
47 | .IR tag ] |
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48 | .RB [ \-c |
49 | .IR comment ] |
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50 | .RB [ \-C |
51 | .IR curve ] |
52 | .br |
53 | \h'8n' |
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54 | .I type |
55 | .IR attr ... |
56 | .br |
57 | .B expire |
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58 | .IR tag ... |
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59 | .br |
60 | .B delete |
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61 | .IR tag ... |
62 | .br |
63 | .B tag |
64 | .I tag |
65 | .RI [ new-tag ] |
66 | .br |
67 | .B comment |
68 | .I tag |
69 | .RI [ comment ] |
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70 | .br |
71 | .B setattr |
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72 | .I tag |
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73 | .IR attr ... |
74 | .br |
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75 | .B lock |
76 | .I qtag |
77 | .br |
78 | .B unlock |
79 | .I qtag |
80 | .br |
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81 | .B list |
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82 | .RB [ \-uqv ] |
83 | .RB [ \-f |
84 | .IR filter ] |
85 | .RI [ tag ...] |
86 | .br |
87 | .B fingerprint |
88 | .RB [ \-f |
89 | .IR filter ] |
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90 | .RB [ \-a |
91 | .IR hash ] |
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92 | .RI [ tag ...] |
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93 | .br |
94 | .B tidy |
95 | .br |
96 | .B extract |
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97 | .RB [ \-f |
98 | .IR filter ] |
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99 | .I file |
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100 | .RI [ tag ...] |
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101 | .br |
102 | .B merge |
103 | .I file |
104 | .SH DESCRIPTION |
105 | The |
106 | .B key |
107 | command performs useful operations on Catacomb keyring files. It |
108 | provides a number of subcommands, by which the various operations may be |
109 | carried out. |
110 | .SS "Global options" |
111 | Before the command name, |
112 | .I "global options" |
113 | may be given. The following global options are supported: |
114 | .TP |
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115 | .BR "\-h, \-\-help " [ \fIcommand ] |
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116 | Writes a brief summary of |
117 | .BR key 's |
118 | various options to standard output, and |
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119 | returns a successful exit status. With a command name, gives help on |
120 | that command. |
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121 | .TP |
122 | .B "\-v, \-\-version" |
123 | Writes the program's version number to standard output, and returns a |
124 | successful exit status. |
125 | .TP |
126 | .B "\-u, \-\-usage" |
127 | Writes a very terse command line summary to standard output, and returns |
128 | a successful exit status. |
129 | .TP |
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130 | .BI "\-k, \-\-keyring " file |
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131 | Names the keyring file which |
132 | .B key |
133 | is to process. The default keyring, used if this option doesn't specify |
134 | one, is the file named |
135 | .B keyring |
136 | in the current directory. The keyring must be stored in a regular file: |
137 | pipes, sockets, devices etc. are not allowed. |
138 | The |
139 | .B key |
140 | program attempts to lock the keyring before accessing it, using |
141 | .BR fcntl (2) |
142 | locking. It will however time out after a short while (10 seconds) and |
143 | report a failure. |
144 | .SS Concepts |
145 | In addition to the actual key data itself, a Catacomb key has a number |
146 | of other pieces of information attached to it: |
147 | .TP |
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148 | .B "keyid" |
149 | Every key has a 32-bit identifying number, written in hexadecimal. |
150 | Keyids are not actually related to the key contents: they're generated |
151 | randomly. Applications use keyids to refer to specific keys; users are |
152 | probably better off with tags and types. A |
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153 | .I deleted |
154 | key cannot be looked up by keyid. |
155 | .TP |
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156 | .B "tag" |
157 | A key's tag is a unique string which can be used by users and |
158 | applications to identify the key. Tag strings may not contain spaces, |
159 | colons or dots. A |
160 | .I deleted |
161 | key cannot be looked up by tag. Whenever a tag name is wanted, a hex |
162 | keyid or key type string can be given instead. |
163 | .TP |
164 | .B "type" |
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165 | A key's type string describes what the key may be used for. The type |
166 | string is arbitrary, except that it may not contain whitespace |
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167 | characters, dots or colons. Applications use key types to obtain an |
168 | arbitrary but suitable key for some purpose. An |
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169 | .I expired |
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170 | key cannot be looked up by type, but may be looked up by keyid or tag. |
171 | .TP |
172 | .B "key encoding" |
173 | There are a number of different ways in which keys can be represented, |
174 | according to the uses to which the key will be put. Most symmetric |
175 | algorithms use |
176 | .I binary |
177 | keys. Keys used with number-theoretic systems (like most common |
178 | public-key systems) use |
179 | .I "multiprecision integer" |
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180 | keys. Elliptic curve systems use |
181 | .I "curve point" |
182 | keys, which are either a pair of integers representing field elements, |
183 | or a `point at infinity'. Algorithms which require several key |
184 | constituents (again, like most public-key systems) use |
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185 | .I structured |
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186 | keys, which consist of a collection of named parts. It's possible to |
187 | store an |
188 | .I "ASCII string" |
189 | as a key, though this is usually done as a component of a structured |
190 | key. Finally, keys (including structured keys) can be encrypted. |
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191 | .TP |
192 | .B "filter" |
193 | Keys and key components may be selected by a filter expression, a |
194 | sequence of flag names separated by commas. Flags are: |
195 | .BR binary , |
196 | .BR integer , |
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197 | .BR struct , |
198 | .BR ec , |
199 | .BR string , |
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200 | or |
201 | .B encrypt |
202 | (describing the key encoding); |
203 | .BR symmetric , |
204 | .BR private , |
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205 | .BR public , |
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206 | or |
207 | .B shared |
208 | (describing the category of key); |
209 | .B burn |
210 | and its negation |
211 | .B \-burn |
212 | (whether the key should be erased from memory after use); and |
213 | .B secret |
214 | and its negation |
215 | .B \-secret |
216 | (whether the key is safe to divulge). |
217 | .TP |
218 | .B "qualified tag" |
219 | A key component may be identified by the key's tag (or keyid, or type). |
220 | Subcomponents of structured keys are identified by following the tag by |
221 | a dot and the name of the subcomponent. |
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222 | .TP |
223 | .B "expiry time" |
224 | Most keys expire after a certain amount of time. Once a key has |
225 | expired, it will no longer be chosen as a result of a lookup by key |
226 | type. However, it is not deleted until its deletion time is also |
227 | reached. |
228 | .TP |
229 | .B "deletion time" |
230 | A key's deletion time is the latest expiry time of any of the objects |
231 | which require that key. For example, a key used for authenticating |
232 | cryptographic cookies should have its deletion time set to the longest |
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233 | expiry time of any of the cookies it can authenticate. Once a key's |
234 | deletion time is passed, it can no longer be referred to by |
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235 | applications, and will be removed from the keyring next time it's |
236 | written to disk. |
237 | .TP |
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238 | .B "comment" |
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239 | A key may be given a comment when it's created. The comment is for the |
240 | benefit of users, and isn't interpreted by applications at all. |
241 | (Hopefully.) |
242 | .TP |
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243 | .B "attributes" |
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244 | A key as zero or more name/value pairs. The names and values are |
245 | arbitrary strings, except they may not contain null bytes. Some |
246 | attributes may have meaning for particular applications or key types; |
247 | others may be assigned global meanings in future. |
248 | .SH "COMMAND REFERENCE" |
249 | .SS add |
250 | The |
251 | .B add |
252 | command creates a new key and adds it to the keyring. The command |
253 | accepts the following options: |
254 | .TP |
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255 | .BI "\-a, \-\-algorithm " alg |
256 | Selects a key generation algorithm. The default algorithm is |
257 | .BR binary ; |
258 | the different algorithms are described below. |
259 | .TP |
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260 | .BI "\-b, \-\-bits " bits |
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261 | The length of the key to generate, in bits. The default, if this option |
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262 | is not supplied, depends on the key-generation algorithm. |
263 | .TP |
264 | .BI "\-B, \-\-qbits " bits |
265 | The length of the subsidiary key or parameter, in bits. Not all |
266 | key-generation algorithms have a subsidiary key size. |
267 | .TP |
268 | .BI "\-p, \-\-parameters " tag |
269 | Selects a key containing parameter values to copy. Not all |
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270 | key-generation algorithms allow the use of shared parameters. A new key |
271 | also inherits attributes from its parameter key. |
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272 | .TP |
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273 | .BI "\-e, \-\-expire " expire |
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274 | The expiry date for the generated key. This may be the string |
275 | .RB ` forever ' |
276 | if the key should never expire automatically, or any date acceptable to |
277 | the |
278 | .BR getdate (3) |
279 | library function. Briefly, |
280 | .B getdate |
281 | understands absolute dates such as |
282 | .RB ` 1999-08-02 ' |
283 | or |
284 | .RB ` "August 2nd, 1999" ', |
285 | and (perhaps more usefully) relative dates such as |
286 | .RB ` "+2 weeks" '. |
287 | The default is to allow a 2 week expiry, which isn't useful. |
288 | .TP |
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289 | .BI "\-c, \-\-comment " comment |
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290 | Sets a comment for the key. The default is not to attach a comment. |
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291 | .TP |
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292 | .BI "\-C, \-\-curve " curve-spec |
293 | Use the elliptic curve described by |
294 | .I curve-spec |
295 | when generating elliptic curve parameters. |
296 | .TP |
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297 | .BI "\-t, \-\-tag " tag |
298 | Selects a tag string for the key. The default is not to set a tag. It |
299 | is an error to select a tag which already exists. |
300 | .TP |
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301 | .BI "\-r, \-\-retag" |
302 | If a |
303 | .B \-t |
304 | option is given, remove this tag from any key which already has it. |
305 | .TP |
306 | .BI "\-R, \-\-rand-id " tag |
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307 | Selects the key to use for the random number generator. Catacomb's |
308 | random number generator can be |
309 | .IR keyed , |
310 | so that, even if the inputs to the generator are compromised, knowledge |
311 | of the key is also necessary to be able to predict the output. By |
312 | default, the latest-expiring key with type |
313 | .B catacomb-rand |
314 | is used, if present; if not, no key is used. |
315 | .TP |
316 | .BI "\-l, \-\-lock" |
317 | Requests that the secret parts of the newly-generated key be encrypted |
318 | using a passphrase. |
319 | .TP |
320 | .BI "\-q, \-\-quiet" |
321 | Suppresses the progress indication which is usually generated while |
322 | time-consuming key generation tasks are being performed. |
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323 | .TP |
324 | .BI "\-L, --lim-lee" |
325 | When generating Diffie-Hellman parameters, generate a Lim-Lee prime |
326 | rather than a random (or safe) prime. See the details on Diffie-Hellman |
327 | key generation below. |
328 | .TP |
329 | .BI "\-S, --subgroup" |
330 | When generating Diffie-Hellman parameters with a Lim-Lee prime, choose a |
331 | generator of a prime-order subgroup rather than a subgroup of order |
332 | .RI ( p "- 1)/2." |
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333 | .PP |
334 | The key's type is given by the required |
335 | .I type |
336 | argument. Following the type are zero or more attributes, which are |
337 | attached to the key in the same way as for the |
338 | .B setattr |
339 | command. |
340 | .PP |
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341 | The key-generation algorithms supported are as follows: |
342 | .TP |
343 | .B "binary" |
344 | Generates a plain binary key of the requested length. If the requested |
345 | key length is not a multiple of eight, the high-order bits of the first |
346 | octet of the key are zeroed. The default key length is 128 bits. |
347 | .TP |
348 | .B "des" |
349 | Generates a DES key, with parity bits. The key length must be 56, 112 |
350 | or 168; the default is 56. The low-order bit of each octet is ignored by |
351 | the DES algorithm; it is used to give each octet odd parity. |
352 | .TP |
353 | .B "rsa" |
354 | Generates a public/private key pair for use with the RSA algorithm. |
355 | .IP |
356 | The key components are |
357 | .I p |
358 | and |
359 | .IR q , |
360 | a pair of prime numbers; |
361 | .IR n , |
362 | the product of |
363 | .I p |
364 | and |
365 | .IR q ; |
366 | .IR e , |
367 | the public exponent; |
368 | .IR d , |
369 | the private exponent, chosen such that |
370 | .IR ed \ \(==\ 1 |
371 | (mod |
372 | .RI ( p \ \-\ 1)( q \ \-\ 1)); |
373 | and some other values useful for optimizing private-key operations: |
374 | .IR q \*(ss\-1\*(se\ mod\ p , |
375 | .IR d \ mod\ p \ \-\ 1, |
376 | and |
377 | .IR d \ mod\ q \ \-\ 1. |
378 | The values |
379 | .I n |
380 | and |
381 | .I e |
382 | constitute the public key; the rest must be kept secret. The key size |
383 | requested by the |
384 | .B \-b |
385 | option determines the size of the modulus |
386 | .IR n ; |
387 | the default is 1024 bits. |
388 | .IP |
389 | The key generation algorithm chooses |
390 | .I p |
391 | and |
392 | .I q |
393 | to be |
394 | .I strong |
395 | primes: both |
396 | .IR p \ \-\ 1 |
397 | and |
398 | .IR p \ +\ 1 |
399 | have large prime factors \- call them |
400 | .I r |
401 | and |
402 | .I s |
403 | respectively \- and |
404 | .IR r \ \-\ 1 |
405 | also has a large prime factor; |
406 | .I q |
407 | has similar properties. |
408 | .IP |
409 | The modulus |
410 | .I n |
411 | cannot be sensibly used as a shared parameter, since knowledge of |
412 | corrssponding public and private exponents is sufficient to be able to |
413 | factor the modulus and recover other users' private keys. |
414 | .TP |
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415 | .B "dh-param" |
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416 | Generates parameters for use with the Diffie-Hellman key exchange |
417 | protocol, and many related systems, such as ElGamal encryption and |
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418 | signatures, and even DSA. (The separate DSA algorithm uses the |
419 | generator described in FIPS186-1.) |
420 | .IP |
421 | The Diffie-Hellman parameters are a prime modulus |
422 | .I p |
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423 | and a generator |
424 | .I g |
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425 | of a subgroup of |
426 | .BR Z / \c |
427 | .IB p Z |
428 | of order |
429 | .IR q . |
430 | The |
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431 | .B \-b |
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432 | option controls the size of the modulus |
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433 | .IR p ; |
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434 | the default size is 1024 bits. |
435 | .IP |
436 | If no |
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437 | .I q |
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438 | size is selected using the |
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439 | .B \-B |
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440 | option and the Lim-Lee prime option is disabled, then |
441 | .I p |
442 | is chosen to be a `safe' prime (i.e., |
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443 | .IR p \ =\ 2 q \ +\ 1, |
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444 | with |
445 | .I q |
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446 | prime). Finding safe primes takes a very long time. In this case, the |
447 | value of |
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448 | .I g |
449 | is fixed as 4. |
450 | .IP |
451 | If a size is chosen for |
452 | .I q |
453 | and Lim-Lee primes are not selected then the prime |
454 | .I q |
455 | is generated and |
456 | .I p |
457 | is chosen so that |
458 | .IR p \ \-\ 1 |
459 | is a multiple of |
460 | .IR q . |
461 | .IP |
462 | If the |
463 | .B \-L |
464 | option was given Lim-Lee primes are selected: the parameters are chosen |
465 | such that |
466 | .IR p \ =\ 2\ q \*(us0\*(ue\ q \*(us1\*(ue\ q \*(us2\*(ue\ ...\ +\ 1, |
467 | where the |
468 | .IR q \*(us i\*(ue |
469 | are primes at least as large as the setting given by the |
470 | .B \-B |
471 | option (or 256 bits, if no setting was given). |
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472 | .IP |
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473 | If the |
474 | .B \-S |
475 | option was given, the generator |
476 | .I g |
477 | is chosen to generate the subgroup of order |
478 | .IR q \*(us0\*(ue; |
479 | otherwise, |
480 | .I g |
481 | will generate the group of order |
482 | .RI ( p \ \-\ 1)/2\ =\ q \*(us0\*(ue\ q \*(us1\*(ue\ q \*(us2\*(ue\ ... |
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483 | .IP |
484 | Finally, the |
485 | .B \-C |
486 | option can be given, in which case the parameters are taken directly |
487 | from the provided group specification, which may either be the the name |
488 | of one of the built-in groups (say |
489 | .B "key add \-a dh\-param \-C list 42" |
490 | for a list) or a triple |
491 | .RI ( p ,\ q ,\ g ). |
492 | separated by commas. No random generation is done in this case: the |
493 | given parameters are simply stored. |
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494 | .TP |
495 | .B "dh" |
496 | Generates a public/private key pair for use with offline Diffie-Hellman, |
497 | ElGamal, DSA or similar discrete-logarithm-based systems. It selects a |
498 | private key |
499 | .IR x \ <\ q , |
500 | and computes the public key |
501 | .IR y \ =\ g\*(ssx\*(se \ mod\ p . |
502 | .TP |
503 | .B "dsa-param" |
504 | Generates parameters for the DSA algorithm. DSA parameters are also |
505 | suitable for use with Diffie-Hellman and ElGamal system. |
506 | .IP |
507 | The main difference between DSA and Diffie-Hellman parameter generation |
508 | is thatthe DSA parameter generation |
509 | algorithm creates a |
510 | .I seed |
511 | from which the parameters are derived, and, assuming that the SHA-1 hash |
512 | function is strong, it's not feasible to construct a seed from which |
513 | deliberately weak parameters are derived. The algorithm used is the one |
514 | described in the DSA standard, FIPS\ 186, extended only to allow |
515 | sequential search for a prime |
516 | .I q |
517 | and to allow arbitrary parameter sizes. The seed is stored, |
518 | Base64-encoded, as the value of the attribute |
519 | .BR seed . |
520 | .IP |
521 | The default lengths for |
522 | .I p |
523 | and |
524 | .I q |
525 | are 768 and 160 bits respectively, since the DSA standard specifies that |
526 | .I q |
527 | be 160 bits, and the choice of 768 bits for |
528 | .I p |
529 | gives commensurate security. |
530 | .TP |
531 | .B "dsa" |
532 | Generates a public/private key pair for DSA. As for Diffie-Hellman |
533 | keys, it selects a |
534 | private key |
535 | .IR x \ <\ q , |
536 | and computes the public key |
537 | .IR y \ =\ g\*(ssx\*(se \ mod\ p . |
538 | .TP |
539 | .B "bbs" |
540 | Generates a public/private key pair for the Blum-Blum-Shub random-number |
541 | generator, and the Blum-Goldwasser semantically-secure public-key |
542 | encryption system. |
543 | .IP |
544 | The key components are prime numbers |
545 | .I p |
546 | and |
547 | .IR q , |
548 | both congruent to 3 (mod\ 4), and their product |
549 | .IR n . |
550 | The public key is simply the modulus |
551 | .IR n ; |
552 | the factors |
553 | .I p |
554 | and |
555 | .I q |
556 | are the private key. |
557 | .IP |
558 | The key-generation algorithm ensures that the two primes |
559 | .I p |
560 | and |
561 | .I q |
562 | are |
563 | .I strong |
564 | (see the discussion of strong primes above, in the section on RSA keys), |
565 | and that |
566 | .RI ( p \ \-\ 1)/2 |
567 | and |
568 | .RI ( q \ \-\ 1)/2 |
569 | are relatively prime, giving a maximum possible period length. |
570 | .IP |
571 | The key size requested by the |
572 | .B \-b |
573 | option determines the length of the modulus |
574 | .IR n ; |
575 | the default length is 1024 bits. |
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576 | .TP |
577 | .B "ec-param" |
578 | Store an elliptic curve specification. If no explicit |
579 | .I curve-spec |
580 | is given (the |
581 | .RB ` \-C ' |
582 | option) then a curve is chosen whose order is about the size given by the |
583 | .RB ` \-b ' |
584 | option (default is 256 bits). |
585 | .IP |
586 | A |
587 | .I curve-spec |
588 | can be given explicitly (in which case |
589 | .RB ` \-b ' |
590 | is ignored). It can either be the name of a built-in curve (say |
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591 | .B "key add \-a ec\-param \-C list 42" |
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592 | for a list of curve names) or a full specification. The curve is |
593 | checked for correctness and security according to the SEC1 |
594 | specification: failed checks cause a warning to be issued to standard |
595 | error (though the program continues anyway). The check can be |
596 | suppressed using the |
597 | .RB ` \-q ' |
598 | option. |
599 | .IP |
600 | A curve specification consists of the following elements optionally |
601 | separated by whitespace: a |
602 | .IR "field type" , |
603 | which is one of |
604 | .BR "prime" , |
605 | .BR "niceprime" , |
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606 | .BR "binpoly" , |
607 | .or |
608 | .BR "binnorm" ; |
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609 | an optional |
610 | .RB ` : '; |
611 | the field modulus |
612 | .IR p ; |
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613 | if the field type is |
614 | .B binnorm |
615 | then an optional |
616 | .RB ` , ' |
617 | and the representation of the normal element \*(*b; an optional |
eb31b00e |
618 | .RB ` / '; |
619 | a |
620 | .IR "curve type" , |
621 | which is one of |
622 | .BR "prime" , |
623 | .BR "primeproj" , |
624 | .BR "bin" , |
625 | and |
626 | .BR "binproj" |
627 | (the `proj' types currently have much better performance); |
628 | an optional |
629 | .RB ` : '; |
630 | the two field-element parameters |
631 | .I a |
632 | and |
633 | .IR b |
634 | which define the elliptic curve |
635 | .IR E , |
636 | separated by an optional |
637 | .RB ` , '; |
638 | an optional |
639 | .RB ` / '; |
640 | the |
641 | .IR x - |
642 | and |
643 | .IR y -coordinates |
644 | of the generator point |
645 | .IR G , |
646 | separated by an optional |
647 | .RB ` , '; |
648 | an optional |
649 | .RB ` : '; |
650 | the order |
651 | .I r |
652 | of the group generated by |
653 | .IR G ; |
654 | an optional |
655 | .RB ` * '; |
656 | and the |
657 | .I cofactor |
658 | .I h |
659 | = |
660 | .RI # E / r . |
661 | .TP |
662 | .B "ec" |
663 | Generate a private scalar and a corresponding public point on an |
664 | elliptic curve. See |
665 | .B ec-param |
666 | above for how to specify elliptic curve parameter sets. The scalar |
667 | .I x |
668 | is chosen unformly between 0 and the curve order |
669 | .IR r ; |
670 | the public point is then |
671 | .I x |
672 | \(mu |
673 | .IR G . |
052b36d0 |
674 | .SS "expire" |
d03ab969 |
675 | Forces keys to immediately expire. An expired key is not chosen when a |
676 | program requests a key by its type. The keys to expire are listed by |
677 | their |
052b36d0 |
678 | .IR tag s. |
679 | .SS "delete" |
d03ab969 |
680 | Deletes keys immediately. The keys to delete are listed by their |
052b36d0 |
681 | .IR tag s. |
d03ab969 |
682 | Be careful when deleting keys. It might be a better idea |
683 | to expire keys rather than deleting them. |
052b36d0 |
684 | .SS "tag" |
685 | Sets, deletes or changes the tag attached to a key. The first tag or |
686 | keyid names the key to be modified; the second, if present specifies the |
687 | new tag to be set. If no second argument is given, the existing tag, if |
d07dfe80 |
688 | any, is removed and no new tag is set. It is an error to set a tag |
689 | which already exists on another key, unless you give the |
690 | .B \-r |
691 | option, which removes the tag first. |
052b36d0 |
692 | .SS "setattr" |
d03ab969 |
693 | Attaches attributes to a key. The key to which the attributes should be |
694 | attached is given by its |
052b36d0 |
695 | .IR tag . |
d03ab969 |
696 | Each attribute has the form |
697 | .IB name = value\fR. |
698 | An attribute can be deleted by assigning it an empty value. Although |
699 | the keyring file format is capable of representing an attribute with an |
700 | empty value as distinct from a nonexistant attribute, this interface |
701 | does not allow empty attributes to be set. |
052b36d0 |
702 | .SS "comment" |
703 | Sets, deletes or changes the comment attached to a key. The first |
704 | argument is a key tag or keyid which names the key to be modified; the |
705 | second, if present, is the new comment. If no second argument is given, |
706 | the existing comment, if any, is removed, and no new comment is set. |
707 | .SS "lock" |
708 | Locks a key or key component using a passphrase. If the key is already |
709 | locked, the existing passphrase is requested, and a new passphrase is |
710 | set. |
711 | .SS "unlock" |
712 | Unlocks a passphrase-locked key or key component. If the key is not |
713 | locked, an error is reported. |
714 | .SS "list" |
d03ab969 |
715 | Lists the keys in the keyring. A couple of options are supported: |
716 | .TP |
717 | .B "\-v, \-\-verbose" |
718 | Increases the amount of information displayed for each key. Repeat for |
719 | a greater effect. |
720 | .TP |
721 | .B "\-q, \-\-quiet" |
722 | Decreases the amount of information displayed for each key. Each use |
723 | cancels a |
724 | .RB ` \-v ' |
725 | option. |
c9e31e42 |
726 | .TP |
727 | .B "\-u, \-\-utc" |
728 | Display key expiry times as UTC rather than using the local time zone. |
052b36d0 |
729 | .TP |
730 | .BI "\-f, \-\-filter " filter |
731 | Specifies a filter. Only keys and key components which match the filter |
732 | are listed. |
d03ab969 |
733 | .PP |
734 | By default, a single line of output is generated for each, showing |
735 | keyids, types, expiry and deletion dates, and comments. Additional |
736 | .RB ` \-v ' |
737 | options show more information, such as the exact time of day for expiry |
052b36d0 |
738 | and deletion, key attributes, and a dump of the actual key data. If the |
739 | verbosity level is sufficiently high, passphrases are requested to |
740 | decrypt locked keys. Make sure nobody is looking over your shoulder |
741 | when you do this! |
742 | .SS "fingerprint" |
743 | Reports a fingerprint (secure hash) on components of requested keys. |
744 | The following option is supported: |
745 | .TP |
746 | .BI "\-f, \-\-filter " filter |
747 | Specifies a filter. Only keys and key components which match the filter |
748 | are fingerprinted. The default is to only fingerprint nonsecret |
749 | components. |
b817bfc6 |
750 | .TP |
751 | .BI "\-a, \-\-algorithm " hash |
752 | Names the hashing algorithm. Run |
753 | .B hashsum -a list |
754 | for a list of hashing algorithms. The default is |
755 | .BR rmd160 . |
052b36d0 |
756 | .PP |
757 | The keys to be fingerprinted are named by their tags or keyids given as |
758 | command line arguments. If no key tags are given, all keys which match |
b817bfc6 |
759 | the filter are fingerprinted. See |
760 | .BR keyring (5) |
761 | for a description of how key fingerprints are computed. |
052b36d0 |
762 | .SS "tidy" |
d03ab969 |
763 | Simply reads the keyring from file and writes it back again. This has |
764 | the effect of removing any deleted keys from the file. |
052b36d0 |
765 | .SS "extract" |
766 | Writes a selection of keys to a file. An option is supported: |
767 | .TP |
768 | .BI "\-f, \-\-filter " filter |
769 | Specifies a filter. Only keys and key components which match the filter |
770 | are written. |
771 | .PP |
772 | Keys extracted are written to the file named by the first argument, |
d03ab969 |
773 | which may be |
774 | .RB ` \- ' |
775 | to designate standard output. The keys to extract are listed by their |
052b36d0 |
776 | tags; if no tags are given, all keys which match the filter are |
777 | extracted. The output is a valid keyring file. |
778 | .SS "merge" |
d03ab969 |
779 | Merges the keys from the named |
780 | .IR file , |
781 | which may be |
782 | .RB ` \- ' |
783 | to designate standard input, with the keyring. Keys already in the |
784 | keyring are not overwritten: you must explicitly remove them first if |
785 | you want them to be replaced during the merge. |
d03ab969 |
786 | .SH "SEE ALSO" |
787 | .BR keyring (5). |
788 | .SH AUTHOR |
789 | Mark Wooding, <mdw@nsict.org> |
790 | |