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1 | /* | |
2 | * read_bignum(): | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * | |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
11 | * | |
12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
33 | */ | |
34 | #include "includes.h" | |
35 | RCSID("$OpenBSD: key.c,v 1.19 2001/03/11 15:03:15 jakob Exp $"); | |
36 | ||
37 | #include <openssl/evp.h> | |
38 | ||
39 | #include "xmalloc.h" | |
40 | #include "key.h" | |
41 | #include "rsa.h" | |
42 | #include "ssh-dss.h" | |
43 | #include "ssh-rsa.h" | |
44 | #include "uuencode.h" | |
45 | #include "buffer.h" | |
46 | #include "bufaux.h" | |
47 | #include "log.h" | |
48 | ||
49 | Key * | |
50 | key_new(int type) | |
51 | { | |
52 | Key *k; | |
53 | RSA *rsa; | |
54 | DSA *dsa; | |
55 | k = xmalloc(sizeof(*k)); | |
56 | k->type = type; | |
57 | k->dsa = NULL; | |
58 | k->rsa = NULL; | |
59 | switch (k->type) { | |
60 | case KEY_RSA1: | |
61 | case KEY_RSA: | |
62 | rsa = RSA_new(); | |
63 | rsa->n = BN_new(); | |
64 | rsa->e = BN_new(); | |
65 | k->rsa = rsa; | |
66 | break; | |
67 | case KEY_DSA: | |
68 | dsa = DSA_new(); | |
69 | dsa->p = BN_new(); | |
70 | dsa->q = BN_new(); | |
71 | dsa->g = BN_new(); | |
72 | dsa->pub_key = BN_new(); | |
73 | k->dsa = dsa; | |
74 | break; | |
75 | case KEY_UNSPEC: | |
76 | break; | |
77 | default: | |
78 | fatal("key_new: bad key type %d", k->type); | |
79 | break; | |
80 | } | |
81 | return k; | |
82 | } | |
83 | Key * | |
84 | key_new_private(int type) | |
85 | { | |
86 | Key *k = key_new(type); | |
87 | switch (k->type) { | |
88 | case KEY_RSA1: | |
89 | case KEY_RSA: | |
90 | k->rsa->d = BN_new(); | |
91 | k->rsa->iqmp = BN_new(); | |
92 | k->rsa->q = BN_new(); | |
93 | k->rsa->p = BN_new(); | |
94 | k->rsa->dmq1 = BN_new(); | |
95 | k->rsa->dmp1 = BN_new(); | |
96 | break; | |
97 | case KEY_DSA: | |
98 | k->dsa->priv_key = BN_new(); | |
99 | break; | |
100 | case KEY_UNSPEC: | |
101 | break; | |
102 | default: | |
103 | break; | |
104 | } | |
105 | return k; | |
106 | } | |
107 | void | |
108 | key_free(Key *k) | |
109 | { | |
110 | switch (k->type) { | |
111 | case KEY_RSA1: | |
112 | case KEY_RSA: | |
113 | if (k->rsa != NULL) | |
114 | RSA_free(k->rsa); | |
115 | k->rsa = NULL; | |
116 | break; | |
117 | case KEY_DSA: | |
118 | if (k->dsa != NULL) | |
119 | DSA_free(k->dsa); | |
120 | k->dsa = NULL; | |
121 | break; | |
122 | case KEY_UNSPEC: | |
123 | break; | |
124 | default: | |
125 | fatal("key_free: bad key type %d", k->type); | |
126 | break; | |
127 | } | |
128 | xfree(k); | |
129 | } | |
130 | int | |
131 | key_equal(Key *a, Key *b) | |
132 | { | |
133 | if (a == NULL || b == NULL || a->type != b->type) | |
134 | return 0; | |
135 | switch (a->type) { | |
136 | case KEY_RSA1: | |
137 | case KEY_RSA: | |
138 | return a->rsa != NULL && b->rsa != NULL && | |
139 | BN_cmp(a->rsa->e, b->rsa->e) == 0 && | |
140 | BN_cmp(a->rsa->n, b->rsa->n) == 0; | |
141 | break; | |
142 | case KEY_DSA: | |
143 | return a->dsa != NULL && b->dsa != NULL && | |
144 | BN_cmp(a->dsa->p, b->dsa->p) == 0 && | |
145 | BN_cmp(a->dsa->q, b->dsa->q) == 0 && | |
146 | BN_cmp(a->dsa->g, b->dsa->g) == 0 && | |
147 | BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0; | |
148 | break; | |
149 | default: | |
150 | fatal("key_equal: bad key type %d", a->type); | |
151 | break; | |
152 | } | |
153 | return 0; | |
154 | } | |
155 | ||
156 | u_char* | |
157 | key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length) | |
158 | { | |
159 | u_char *blob = NULL; | |
160 | u_char *retval = NULL; | |
161 | int len = 0; | |
162 | int nlen, elen; | |
163 | ||
164 | *dgst_raw_length = 0; | |
165 | ||
166 | switch (k->type) { | |
167 | case KEY_RSA1: | |
168 | nlen = BN_num_bytes(k->rsa->n); | |
169 | elen = BN_num_bytes(k->rsa->e); | |
170 | len = nlen + elen; | |
171 | blob = xmalloc(len); | |
172 | BN_bn2bin(k->rsa->n, blob); | |
173 | BN_bn2bin(k->rsa->e, blob + nlen); | |
174 | break; | |
175 | case KEY_DSA: | |
176 | case KEY_RSA: | |
177 | key_to_blob(k, &blob, &len); | |
178 | break; | |
179 | case KEY_UNSPEC: | |
180 | return retval; | |
181 | break; | |
182 | default: | |
183 | fatal("key_fingerprint_raw: bad key type %d", k->type); | |
184 | break; | |
185 | } | |
186 | if (blob != NULL) { | |
187 | EVP_MD *md = NULL; | |
188 | EVP_MD_CTX ctx; | |
189 | ||
190 | retval = xmalloc(EVP_MAX_MD_SIZE); | |
191 | ||
192 | switch (dgst_type) { | |
193 | case SSH_FP_MD5: | |
194 | md = EVP_md5(); | |
195 | break; | |
196 | case SSH_FP_SHA1: | |
197 | md = EVP_sha1(); | |
198 | break; | |
199 | default: | |
200 | fatal("key_fingerprint_raw: bad digest type %d", | |
201 | dgst_type); | |
202 | } | |
203 | ||
204 | EVP_DigestInit(&ctx, md); | |
205 | EVP_DigestUpdate(&ctx, blob, len); | |
206 | EVP_DigestFinal(&ctx, retval, NULL); | |
207 | *dgst_raw_length = md->md_size; | |
208 | memset(blob, 0, len); | |
209 | xfree(blob); | |
210 | } else { | |
211 | fatal("key_fingerprint_raw: blob is null"); | |
212 | } | |
213 | return retval; | |
214 | } | |
215 | ||
216 | char* | |
217 | key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len) | |
218 | { | |
219 | char *retval; | |
220 | int i; | |
221 | ||
222 | retval = xmalloc(dgst_raw_len * 3); | |
223 | retval[0] = '\0'; | |
224 | for(i = 0; i < dgst_raw_len; i++) { | |
225 | char hex[4]; | |
226 | snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]); | |
227 | strlcat(retval, hex, dgst_raw_len * 3); | |
228 | } | |
229 | retval[(dgst_raw_len * 3) - 1] = '\0'; | |
230 | return retval; | |
231 | } | |
232 | ||
233 | char* | |
234 | key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len) | |
235 | { | |
236 | char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' }; | |
237 | char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm', | |
238 | 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' }; | |
239 | u_int rounds, idx, retval_idx, seed; | |
240 | char *retval; | |
241 | ||
242 | rounds = (dgst_raw_len / 2) + 1; | |
243 | retval = xmalloc(sizeof(char) * (rounds*6)); | |
244 | seed = 1; | |
245 | retval_idx = 0; | |
246 | retval[retval_idx++] = 'x'; | |
247 | for (idx=0;idx<rounds;idx++) { | |
248 | u_int idx0, idx1, idx2, idx3, idx4; | |
249 | if ((idx + 1 < rounds) || (dgst_raw_len % 2 != 0)) { | |
250 | idx0 = (((((u_int)(dgst_raw[2 * idx])) >> 6) & 3) + | |
251 | seed) % 6; | |
252 | idx1 = (((u_int)(dgst_raw[2 * idx])) >> 2) & 15; | |
253 | idx2 = ((((u_int)(dgst_raw[2 * idx])) & 3) + | |
254 | (seed / 6)) % 6; | |
255 | retval[retval_idx++] = vowels[idx0]; | |
256 | retval[retval_idx++] = consonants[idx1]; | |
257 | retval[retval_idx++] = vowels[idx2]; | |
258 | if ((idx + 1) < rounds) { | |
259 | idx3 = (((u_int)(dgst_raw[(2 * idx) + 1])) >> 4) & 15; | |
260 | idx4 = (((u_int)(dgst_raw[(2 * idx) + 1]))) & 15; | |
261 | retval[retval_idx++] = consonants[idx3]; | |
262 | retval[retval_idx++] = '-'; | |
263 | retval[retval_idx++] = consonants[idx4]; | |
264 | seed = ((seed * 5) + | |
265 | ((((u_int)(dgst_raw[2 * idx])) * 7) + | |
266 | ((u_int)(dgst_raw[(2 * idx) + 1])))) % 36; | |
267 | } | |
268 | } else { | |
269 | idx0 = seed % 6; | |
270 | idx1 = 16; | |
271 | idx2 = seed / 6; | |
272 | retval[retval_idx++] = vowels[idx0]; | |
273 | retval[retval_idx++] = consonants[idx1]; | |
274 | retval[retval_idx++] = vowels[idx2]; | |
275 | } | |
276 | } | |
277 | retval[retval_idx++] = 'x'; | |
278 | retval[retval_idx++] = '\0'; | |
279 | return retval; | |
280 | } | |
281 | ||
282 | char* | |
283 | key_fingerprint_ex(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep) | |
284 | { | |
285 | char *retval = NULL; | |
286 | u_char *dgst_raw; | |
287 | size_t dgst_raw_len; | |
288 | ||
289 | dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len); | |
290 | if (!dgst_raw) | |
291 | fatal("key_fingerprint_ex: null value returned from key_fingerprint_raw()"); | |
292 | switch(dgst_rep) { | |
293 | case SSH_FP_HEX: | |
294 | retval = key_fingerprint_hex(dgst_raw, dgst_raw_len); | |
295 | break; | |
296 | case SSH_FP_BUBBLEBABBLE: | |
297 | retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len); | |
298 | break; | |
299 | default: | |
300 | fatal("key_fingerprint_ex: bad digest representation %d", | |
301 | dgst_rep); | |
302 | break; | |
303 | } | |
304 | memset(dgst_raw, 0, dgst_raw_len); | |
305 | xfree(dgst_raw); | |
306 | return retval; | |
307 | } | |
308 | ||
309 | char * | |
310 | key_fingerprint(Key *k) | |
311 | { | |
312 | static char retval[(EVP_MAX_MD_SIZE + 1) * 3]; | |
313 | char *digest; | |
314 | ||
315 | digest = key_fingerprint_ex(k, SSH_FP_MD5, SSH_FP_HEX); | |
316 | strlcpy(retval, digest, sizeof(retval)); | |
317 | xfree(digest); | |
318 | return retval; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Reads a multiple-precision integer in decimal from the buffer, and advances | |
323 | * the pointer. The integer must already be initialized. This function is | |
324 | * permitted to modify the buffer. This leaves *cpp to point just beyond the | |
325 | * last processed (and maybe modified) character. Note that this may modify | |
326 | * the buffer containing the number. | |
327 | */ | |
328 | int | |
329 | read_bignum(char **cpp, BIGNUM * value) | |
330 | { | |
331 | char *cp = *cpp; | |
332 | int old; | |
333 | ||
334 | /* Skip any leading whitespace. */ | |
335 | for (; *cp == ' ' || *cp == '\t'; cp++) | |
336 | ; | |
337 | ||
338 | /* Check that it begins with a decimal digit. */ | |
339 | if (*cp < '0' || *cp > '9') | |
340 | return 0; | |
341 | ||
342 | /* Save starting position. */ | |
343 | *cpp = cp; | |
344 | ||
345 | /* Move forward until all decimal digits skipped. */ | |
346 | for (; *cp >= '0' && *cp <= '9'; cp++) | |
347 | ; | |
348 | ||
349 | /* Save the old terminating character, and replace it by \0. */ | |
350 | old = *cp; | |
351 | *cp = 0; | |
352 | ||
353 | /* Parse the number. */ | |
354 | if (BN_dec2bn(&value, *cpp) == 0) | |
355 | return 0; | |
356 | ||
357 | /* Restore old terminating character. */ | |
358 | *cp = old; | |
359 | ||
360 | /* Move beyond the number and return success. */ | |
361 | *cpp = cp; | |
362 | return 1; | |
363 | } | |
364 | int | |
365 | write_bignum(FILE *f, BIGNUM *num) | |
366 | { | |
367 | char *buf = BN_bn2dec(num); | |
368 | if (buf == NULL) { | |
369 | error("write_bignum: BN_bn2dec() failed"); | |
370 | return 0; | |
371 | } | |
372 | fprintf(f, " %s", buf); | |
373 | xfree(buf); | |
374 | return 1; | |
375 | } | |
376 | ||
377 | /* returns 1 ok, -1 error, 0 type mismatch */ | |
378 | int | |
379 | key_read(Key *ret, char **cpp) | |
380 | { | |
381 | Key *k; | |
382 | int success = -1; | |
383 | char *cp, *space; | |
384 | int len, n, type; | |
385 | u_int bits; | |
386 | u_char *blob; | |
387 | ||
388 | cp = *cpp; | |
389 | ||
390 | switch(ret->type) { | |
391 | case KEY_RSA1: | |
392 | /* Get number of bits. */ | |
393 | if (*cp < '0' || *cp > '9') | |
394 | return -1; /* Bad bit count... */ | |
395 | for (bits = 0; *cp >= '0' && *cp <= '9'; cp++) | |
396 | bits = 10 * bits + *cp - '0'; | |
397 | if (bits == 0) | |
398 | return -1; | |
399 | *cpp = cp; | |
400 | /* Get public exponent, public modulus. */ | |
401 | if (!read_bignum(cpp, ret->rsa->e)) | |
402 | return -1; | |
403 | if (!read_bignum(cpp, ret->rsa->n)) | |
404 | return -1; | |
405 | success = 1; | |
406 | break; | |
407 | case KEY_UNSPEC: | |
408 | case KEY_RSA: | |
409 | case KEY_DSA: | |
410 | space = strchr(cp, ' '); | |
411 | if (space == NULL) { | |
412 | debug3("key_read: no space"); | |
413 | return -1; | |
414 | } | |
415 | *space = '\0'; | |
416 | type = key_type_from_name(cp); | |
417 | *space = ' '; | |
418 | if (type == KEY_UNSPEC) { | |
419 | debug3("key_read: no key found"); | |
420 | return -1; | |
421 | } | |
422 | cp = space+1; | |
423 | if (*cp == '\0') { | |
424 | debug3("key_read: short string"); | |
425 | return -1; | |
426 | } | |
427 | if (ret->type == KEY_UNSPEC) { | |
428 | ret->type = type; | |
429 | } else if (ret->type != type) { | |
430 | /* is a key, but different type */ | |
431 | debug3("key_read: type mismatch"); | |
432 | return 0; | |
433 | } | |
434 | len = 2*strlen(cp); | |
435 | blob = xmalloc(len); | |
436 | n = uudecode(cp, blob, len); | |
437 | if (n < 0) { | |
438 | error("key_read: uudecode %s failed", cp); | |
439 | return -1; | |
440 | } | |
441 | k = key_from_blob(blob, n); | |
442 | if (k == NULL) { | |
443 | error("key_read: key_from_blob %s failed", cp); | |
444 | return -1; | |
445 | } | |
446 | xfree(blob); | |
447 | if (k->type != type) { | |
448 | error("key_read: type mismatch: encoding error"); | |
449 | key_free(k); | |
450 | return -1; | |
451 | } | |
452 | /*XXXX*/ | |
453 | if (ret->type == KEY_RSA) { | |
454 | if (ret->rsa != NULL) | |
455 | RSA_free(ret->rsa); | |
456 | ret->rsa = k->rsa; | |
457 | k->rsa = NULL; | |
458 | success = 1; | |
459 | #ifdef DEBUG_PK | |
460 | RSA_print_fp(stderr, ret->rsa, 8); | |
461 | #endif | |
462 | } else { | |
463 | if (ret->dsa != NULL) | |
464 | DSA_free(ret->dsa); | |
465 | ret->dsa = k->dsa; | |
466 | k->dsa = NULL; | |
467 | success = 1; | |
468 | #ifdef DEBUG_PK | |
469 | DSA_print_fp(stderr, ret->dsa, 8); | |
470 | #endif | |
471 | } | |
472 | /*XXXX*/ | |
473 | if (success != 1) | |
474 | break; | |
475 | key_free(k); | |
476 | /* advance cp: skip whitespace and data */ | |
477 | while (*cp == ' ' || *cp == '\t') | |
478 | cp++; | |
479 | while (*cp != '\0' && *cp != ' ' && *cp != '\t') | |
480 | cp++; | |
481 | *cpp = cp; | |
482 | break; | |
483 | default: | |
484 | fatal("key_read: bad key type: %d", ret->type); | |
485 | break; | |
486 | } | |
487 | return success; | |
488 | } | |
489 | int | |
490 | key_write(Key *key, FILE *f) | |
491 | { | |
492 | int success = 0; | |
493 | u_int bits = 0; | |
494 | ||
495 | if (key->type == KEY_RSA1 && key->rsa != NULL) { | |
496 | /* size of modulus 'n' */ | |
497 | bits = BN_num_bits(key->rsa->n); | |
498 | fprintf(f, "%u", bits); | |
499 | if (write_bignum(f, key->rsa->e) && | |
500 | write_bignum(f, key->rsa->n)) { | |
501 | success = 1; | |
502 | } else { | |
503 | error("key_write: failed for RSA key"); | |
504 | } | |
505 | } else if ((key->type == KEY_DSA && key->dsa != NULL) || | |
506 | (key->type == KEY_RSA && key->rsa != NULL)) { | |
507 | int len, n; | |
508 | u_char *blob, *uu; | |
509 | key_to_blob(key, &blob, &len); | |
510 | uu = xmalloc(2*len); | |
511 | n = uuencode(blob, len, uu, 2*len); | |
512 | if (n > 0) { | |
513 | fprintf(f, "%s %s", key_ssh_name(key), uu); | |
514 | success = 1; | |
515 | } | |
516 | xfree(blob); | |
517 | xfree(uu); | |
518 | } | |
519 | return success; | |
520 | } | |
521 | char * | |
522 | key_type(Key *k) | |
523 | { | |
524 | switch (k->type) { | |
525 | case KEY_RSA1: | |
526 | return "RSA1"; | |
527 | break; | |
528 | case KEY_RSA: | |
529 | return "RSA"; | |
530 | break; | |
531 | case KEY_DSA: | |
532 | return "DSA"; | |
533 | break; | |
534 | } | |
535 | return "unknown"; | |
536 | } | |
537 | char * | |
538 | key_ssh_name(Key *k) | |
539 | { | |
540 | switch (k->type) { | |
541 | case KEY_RSA: | |
542 | return "ssh-rsa"; | |
543 | break; | |
544 | case KEY_DSA: | |
545 | return "ssh-dss"; | |
546 | break; | |
547 | } | |
548 | return "ssh-unknown"; | |
549 | } | |
550 | u_int | |
551 | key_size(Key *k){ | |
552 | switch (k->type) { | |
553 | case KEY_RSA1: | |
554 | case KEY_RSA: | |
555 | return BN_num_bits(k->rsa->n); | |
556 | break; | |
557 | case KEY_DSA: | |
558 | return BN_num_bits(k->dsa->p); | |
559 | break; | |
560 | } | |
561 | return 0; | |
562 | } | |
563 | ||
564 | RSA * | |
565 | rsa_generate_private_key(u_int bits) | |
566 | { | |
567 | RSA *private; | |
568 | private = RSA_generate_key(bits, 35, NULL, NULL); | |
569 | if (private == NULL) | |
570 | fatal("rsa_generate_private_key: key generation failed."); | |
571 | return private; | |
572 | } | |
573 | ||
574 | DSA* | |
575 | dsa_generate_private_key(u_int bits) | |
576 | { | |
577 | DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL); | |
578 | if (private == NULL) | |
579 | fatal("dsa_generate_private_key: DSA_generate_parameters failed"); | |
580 | if (!DSA_generate_key(private)) | |
581 | fatal("dsa_generate_private_key: DSA_generate_key failed."); | |
582 | if (private == NULL) | |
583 | fatal("dsa_generate_private_key: NULL."); | |
584 | return private; | |
585 | } | |
586 | ||
587 | Key * | |
588 | key_generate(int type, u_int bits) | |
589 | { | |
590 | Key *k = key_new(KEY_UNSPEC); | |
591 | switch (type) { | |
592 | case KEY_DSA: | |
593 | k->dsa = dsa_generate_private_key(bits); | |
594 | break; | |
595 | case KEY_RSA: | |
596 | case KEY_RSA1: | |
597 | k->rsa = rsa_generate_private_key(bits); | |
598 | break; | |
599 | default: | |
600 | fatal("key_generate: unknown type %d", type); | |
601 | } | |
602 | k->type = type; | |
603 | return k; | |
604 | } | |
605 | ||
606 | Key * | |
607 | key_from_private(Key *k) | |
608 | { | |
609 | Key *n = NULL; | |
610 | switch (k->type) { | |
611 | case KEY_DSA: | |
612 | n = key_new(k->type); | |
613 | BN_copy(n->dsa->p, k->dsa->p); | |
614 | BN_copy(n->dsa->q, k->dsa->q); | |
615 | BN_copy(n->dsa->g, k->dsa->g); | |
616 | BN_copy(n->dsa->pub_key, k->dsa->pub_key); | |
617 | break; | |
618 | case KEY_RSA: | |
619 | case KEY_RSA1: | |
620 | n = key_new(k->type); | |
621 | BN_copy(n->rsa->n, k->rsa->n); | |
622 | BN_copy(n->rsa->e, k->rsa->e); | |
623 | break; | |
624 | default: | |
625 | fatal("key_from_private: unknown type %d", k->type); | |
626 | break; | |
627 | } | |
628 | return n; | |
629 | } | |
630 | ||
631 | int | |
632 | key_type_from_name(char *name) | |
633 | { | |
634 | if (strcmp(name, "rsa1") == 0){ | |
635 | return KEY_RSA1; | |
636 | } else if (strcmp(name, "rsa") == 0){ | |
637 | return KEY_RSA; | |
638 | } else if (strcmp(name, "dsa") == 0){ | |
639 | return KEY_DSA; | |
640 | } else if (strcmp(name, "ssh-rsa") == 0){ | |
641 | return KEY_RSA; | |
642 | } else if (strcmp(name, "ssh-dss") == 0){ | |
643 | return KEY_DSA; | |
644 | } | |
645 | debug2("key_type_from_name: unknown key type '%s'", name); | |
646 | return KEY_UNSPEC; | |
647 | } | |
648 | ||
649 | Key * | |
650 | key_from_blob(char *blob, int blen) | |
651 | { | |
652 | Buffer b; | |
653 | char *ktype; | |
654 | int rlen, type; | |
655 | Key *key = NULL; | |
656 | ||
657 | #ifdef DEBUG_PK | |
658 | dump_base64(stderr, blob, blen); | |
659 | #endif | |
660 | buffer_init(&b); | |
661 | buffer_append(&b, blob, blen); | |
662 | ktype = buffer_get_string(&b, NULL); | |
663 | type = key_type_from_name(ktype); | |
664 | ||
665 | switch(type){ | |
666 | case KEY_RSA: | |
667 | key = key_new(type); | |
668 | buffer_get_bignum2(&b, key->rsa->e); | |
669 | buffer_get_bignum2(&b, key->rsa->n); | |
670 | #ifdef DEBUG_PK | |
671 | RSA_print_fp(stderr, key->rsa, 8); | |
672 | #endif | |
673 | break; | |
674 | case KEY_DSA: | |
675 | key = key_new(type); | |
676 | buffer_get_bignum2(&b, key->dsa->p); | |
677 | buffer_get_bignum2(&b, key->dsa->q); | |
678 | buffer_get_bignum2(&b, key->dsa->g); | |
679 | buffer_get_bignum2(&b, key->dsa->pub_key); | |
680 | #ifdef DEBUG_PK | |
681 | DSA_print_fp(stderr, key->dsa, 8); | |
682 | #endif | |
683 | break; | |
684 | case KEY_UNSPEC: | |
685 | key = key_new(type); | |
686 | break; | |
687 | default: | |
688 | error("key_from_blob: cannot handle type %s", ktype); | |
689 | break; | |
690 | } | |
691 | rlen = buffer_len(&b); | |
692 | if (key != NULL && rlen != 0) | |
693 | error("key_from_blob: remaining bytes in key blob %d", rlen); | |
694 | xfree(ktype); | |
695 | buffer_free(&b); | |
696 | return key; | |
697 | } | |
698 | ||
699 | int | |
700 | key_to_blob(Key *key, u_char **blobp, u_int *lenp) | |
701 | { | |
702 | Buffer b; | |
703 | int len; | |
704 | u_char *buf; | |
705 | ||
706 | if (key == NULL) { | |
707 | error("key_to_blob: key == NULL"); | |
708 | return 0; | |
709 | } | |
710 | buffer_init(&b); | |
711 | switch(key->type){ | |
712 | case KEY_DSA: | |
713 | buffer_put_cstring(&b, key_ssh_name(key)); | |
714 | buffer_put_bignum2(&b, key->dsa->p); | |
715 | buffer_put_bignum2(&b, key->dsa->q); | |
716 | buffer_put_bignum2(&b, key->dsa->g); | |
717 | buffer_put_bignum2(&b, key->dsa->pub_key); | |
718 | break; | |
719 | case KEY_RSA: | |
720 | buffer_put_cstring(&b, key_ssh_name(key)); | |
721 | buffer_put_bignum2(&b, key->rsa->e); | |
722 | buffer_put_bignum2(&b, key->rsa->n); | |
723 | break; | |
724 | default: | |
725 | error("key_to_blob: illegal key type %d", key->type); | |
726 | break; | |
727 | } | |
728 | len = buffer_len(&b); | |
729 | buf = xmalloc(len); | |
730 | memcpy(buf, buffer_ptr(&b), len); | |
731 | memset(buffer_ptr(&b), 0, len); | |
732 | buffer_free(&b); | |
733 | if (lenp != NULL) | |
734 | *lenp = len; | |
735 | if (blobp != NULL) | |
736 | *blobp = buf; | |
737 | return len; | |
738 | } | |
739 | ||
740 | int | |
741 | key_sign( | |
742 | Key *key, | |
743 | u_char **sigp, int *lenp, | |
744 | u_char *data, int datalen) | |
745 | { | |
746 | switch(key->type){ | |
747 | case KEY_DSA: | |
748 | return ssh_dss_sign(key, sigp, lenp, data, datalen); | |
749 | break; | |
750 | case KEY_RSA: | |
751 | return ssh_rsa_sign(key, sigp, lenp, data, datalen); | |
752 | break; | |
753 | default: | |
754 | error("key_sign: illegal key type %d", key->type); | |
755 | return -1; | |
756 | break; | |
757 | } | |
758 | } | |
759 | ||
760 | int | |
761 | key_verify( | |
762 | Key *key, | |
763 | u_char *signature, int signaturelen, | |
764 | u_char *data, int datalen) | |
765 | { | |
766 | switch(key->type){ | |
767 | case KEY_DSA: | |
768 | return ssh_dss_verify(key, signature, signaturelen, data, datalen); | |
769 | break; | |
770 | case KEY_RSA: | |
771 | return ssh_rsa_verify(key, signature, signaturelen, data, datalen); | |
772 | break; | |
773 | default: | |
774 | error("key_verify: illegal key type %d", key->type); | |
775 | return -1; | |
776 | break; | |
777 | } | |
778 | } |