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updating OPENSSH_GSSAPI_Protocol1-branch with latest on the trunk (OpenSSH 3.2.3p1)
[gssapi-openssh.git] / openssh / key.c
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3c0ef626 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, 2001 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"
510132b6 35RCSID("$OpenBSD: key.c,v 1.43 2002/03/19 10:49:35 markus Exp $");
3c0ef626 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
49Key *
50key_new(int type)
51{
52 Key *k;
53 RSA *rsa;
54 DSA *dsa;
55 k = xmalloc(sizeof(*k));
56 k->type = type;
57 k->flags = 0;
58 k->dsa = NULL;
59 k->rsa = NULL;
60 switch (k->type) {
61 case KEY_RSA1:
62 case KEY_RSA:
1e608e42 63 if ((rsa = RSA_new()) == NULL)
64 fatal("key_new: RSA_new failed");
65 if ((rsa->n = BN_new()) == NULL)
66 fatal("key_new: BN_new failed");
67 if ((rsa->e = BN_new()) == NULL)
68 fatal("key_new: BN_new failed");
3c0ef626 69 k->rsa = rsa;
70 break;
71 case KEY_DSA:
1e608e42 72 if ((dsa = DSA_new()) == NULL)
73 fatal("key_new: DSA_new failed");
74 if ((dsa->p = BN_new()) == NULL)
75 fatal("key_new: BN_new failed");
76 if ((dsa->q = BN_new()) == NULL)
77 fatal("key_new: BN_new failed");
78 if ((dsa->g = BN_new()) == NULL)
79 fatal("key_new: BN_new failed");
80 if ((dsa->pub_key = BN_new()) == NULL)
81 fatal("key_new: BN_new failed");
3c0ef626 82 k->dsa = dsa;
83 break;
84 case KEY_UNSPEC:
85 break;
86 default:
87 fatal("key_new: bad key type %d", k->type);
88 break;
89 }
90 return k;
91}
92Key *
93key_new_private(int type)
94{
95 Key *k = key_new(type);
96 switch (k->type) {
97 case KEY_RSA1:
98 case KEY_RSA:
1e608e42 99 if ((k->rsa->d = BN_new()) == NULL)
100 fatal("key_new_private: BN_new failed");
101 if ((k->rsa->iqmp = BN_new()) == NULL)
102 fatal("key_new_private: BN_new failed");
103 if ((k->rsa->q = BN_new()) == NULL)
104 fatal("key_new_private: BN_new failed");
105 if ((k->rsa->p = BN_new()) == NULL)
106 fatal("key_new_private: BN_new failed");
107 if ((k->rsa->dmq1 = BN_new()) == NULL)
108 fatal("key_new_private: BN_new failed");
109 if ((k->rsa->dmp1 = BN_new()) == NULL)
110 fatal("key_new_private: BN_new failed");
3c0ef626 111 break;
112 case KEY_DSA:
1e608e42 113 if ((k->dsa->priv_key = BN_new()) == NULL)
114 fatal("key_new_private: BN_new failed");
3c0ef626 115 break;
116 case KEY_UNSPEC:
117 break;
118 default:
119 break;
120 }
121 return k;
122}
123void
124key_free(Key *k)
125{
126 switch (k->type) {
127 case KEY_RSA1:
128 case KEY_RSA:
129 if (k->rsa != NULL)
130 RSA_free(k->rsa);
131 k->rsa = NULL;
132 break;
133 case KEY_DSA:
134 if (k->dsa != NULL)
135 DSA_free(k->dsa);
136 k->dsa = NULL;
137 break;
138 case KEY_UNSPEC:
139 break;
140 default:
141 fatal("key_free: bad key type %d", k->type);
142 break;
143 }
144 xfree(k);
145}
146int
147key_equal(Key *a, Key *b)
148{
149 if (a == NULL || b == NULL || a->type != b->type)
150 return 0;
151 switch (a->type) {
152 case KEY_RSA1:
153 case KEY_RSA:
154 return a->rsa != NULL && b->rsa != NULL &&
155 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
156 BN_cmp(a->rsa->n, b->rsa->n) == 0;
157 break;
158 case KEY_DSA:
159 return a->dsa != NULL && b->dsa != NULL &&
160 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
161 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
162 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
163 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
164 break;
165 default:
166 fatal("key_equal: bad key type %d", a->type);
167 break;
168 }
169 return 0;
170}
171
172static u_char*
1e608e42 173key_fingerprint_raw(Key *k, enum fp_type dgst_type, u_int *dgst_raw_length)
3c0ef626 174{
1e608e42 175 const EVP_MD *md = NULL;
3c0ef626 176 EVP_MD_CTX ctx;
177 u_char *blob = NULL;
178 u_char *retval = NULL;
1e608e42 179 u_int len = 0;
3c0ef626 180 int nlen, elen;
181
182 *dgst_raw_length = 0;
183
184 switch (dgst_type) {
185 case SSH_FP_MD5:
186 md = EVP_md5();
187 break;
188 case SSH_FP_SHA1:
189 md = EVP_sha1();
190 break;
191 default:
192 fatal("key_fingerprint_raw: bad digest type %d",
193 dgst_type);
194 }
195 switch (k->type) {
196 case KEY_RSA1:
197 nlen = BN_num_bytes(k->rsa->n);
198 elen = BN_num_bytes(k->rsa->e);
199 len = nlen + elen;
200 blob = xmalloc(len);
201 BN_bn2bin(k->rsa->n, blob);
202 BN_bn2bin(k->rsa->e, blob + nlen);
203 break;
204 case KEY_DSA:
205 case KEY_RSA:
206 key_to_blob(k, &blob, &len);
207 break;
208 case KEY_UNSPEC:
209 return retval;
210 break;
211 default:
212 fatal("key_fingerprint_raw: bad key type %d", k->type);
213 break;
214 }
215 if (blob != NULL) {
216 retval = xmalloc(EVP_MAX_MD_SIZE);
217 EVP_DigestInit(&ctx, md);
218 EVP_DigestUpdate(&ctx, blob, len);
1e608e42 219 EVP_DigestFinal(&ctx, retval, dgst_raw_length);
3c0ef626 220 memset(blob, 0, len);
221 xfree(blob);
222 } else {
223 fatal("key_fingerprint_raw: blob is null");
224 }
225 return retval;
226}
227
228static char*
1e608e42 229key_fingerprint_hex(u_char* dgst_raw, u_int dgst_raw_len)
3c0ef626 230{
231 char *retval;
232 int i;
233
234 retval = xmalloc(dgst_raw_len * 3 + 1);
235 retval[0] = '\0';
1e608e42 236 for (i = 0; i < dgst_raw_len; i++) {
3c0ef626 237 char hex[4];
238 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
239 strlcat(retval, hex, dgst_raw_len * 3);
240 }
241 retval[(dgst_raw_len * 3) - 1] = '\0';
242 return retval;
243}
244
245static char*
1e608e42 246key_fingerprint_bubblebabble(u_char* dgst_raw, u_int dgst_raw_len)
3c0ef626 247{
248 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
249 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
250 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
251 u_int i, j = 0, rounds, seed = 1;
252 char *retval;
253
254 rounds = (dgst_raw_len / 2) + 1;
255 retval = xmalloc(sizeof(char) * (rounds*6));
256 retval[j++] = 'x';
257 for (i = 0; i < rounds; i++) {
258 u_int idx0, idx1, idx2, idx3, idx4;
259 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
260 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
261 seed) % 6;
262 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
263 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
264 (seed / 6)) % 6;
265 retval[j++] = vowels[idx0];
266 retval[j++] = consonants[idx1];
267 retval[j++] = vowels[idx2];
268 if ((i + 1) < rounds) {
269 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
270 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
271 retval[j++] = consonants[idx3];
272 retval[j++] = '-';
273 retval[j++] = consonants[idx4];
274 seed = ((seed * 5) +
275 ((((u_int)(dgst_raw[2 * i])) * 7) +
276 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
277 }
278 } else {
279 idx0 = seed % 6;
280 idx1 = 16;
281 idx2 = seed / 6;
282 retval[j++] = vowels[idx0];
283 retval[j++] = consonants[idx1];
284 retval[j++] = vowels[idx2];
285 }
286 }
287 retval[j++] = 'x';
288 retval[j++] = '\0';
289 return retval;
290}
291
292char*
293key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
294{
295 char *retval = NULL;
296 u_char *dgst_raw;
1e608e42 297 u_int dgst_raw_len;
298
3c0ef626 299 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
300 if (!dgst_raw)
301 fatal("key_fingerprint: null from key_fingerprint_raw()");
1e608e42 302 switch (dgst_rep) {
3c0ef626 303 case SSH_FP_HEX:
304 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
305 break;
306 case SSH_FP_BUBBLEBABBLE:
307 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
308 break;
309 default:
310 fatal("key_fingerprint_ex: bad digest representation %d",
311 dgst_rep);
312 break;
313 }
314 memset(dgst_raw, 0, dgst_raw_len);
315 xfree(dgst_raw);
316 return retval;
317}
318
319/*
320 * Reads a multiple-precision integer in decimal from the buffer, and advances
321 * the pointer. The integer must already be initialized. This function is
322 * permitted to modify the buffer. This leaves *cpp to point just beyond the
323 * last processed (and maybe modified) character. Note that this may modify
324 * the buffer containing the number.
325 */
326static int
327read_bignum(char **cpp, BIGNUM * value)
328{
329 char *cp = *cpp;
330 int old;
331
332 /* Skip any leading whitespace. */
333 for (; *cp == ' ' || *cp == '\t'; cp++)
334 ;
335
336 /* Check that it begins with a decimal digit. */
337 if (*cp < '0' || *cp > '9')
338 return 0;
339
340 /* Save starting position. */
341 *cpp = cp;
342
343 /* Move forward until all decimal digits skipped. */
344 for (; *cp >= '0' && *cp <= '9'; cp++)
345 ;
346
347 /* Save the old terminating character, and replace it by \0. */
348 old = *cp;
349 *cp = 0;
350
351 /* Parse the number. */
352 if (BN_dec2bn(&value, *cpp) == 0)
353 return 0;
354
355 /* Restore old terminating character. */
356 *cp = old;
357
358 /* Move beyond the number and return success. */
359 *cpp = cp;
360 return 1;
361}
362static int
363write_bignum(FILE *f, BIGNUM *num)
364{
365 char *buf = BN_bn2dec(num);
366 if (buf == NULL) {
367 error("write_bignum: BN_bn2dec() failed");
368 return 0;
369 }
370 fprintf(f, " %s", buf);
371 OPENSSL_free(buf);
372 return 1;
373}
374
375/* returns 1 ok, -1 error */
376int
377key_read(Key *ret, char **cpp)
378{
379 Key *k;
380 int success = -1;
381 char *cp, *space;
382 int len, n, type;
383 u_int bits;
384 u_char *blob;
385
386 cp = *cpp;
387
1e608e42 388 switch (ret->type) {
3c0ef626 389 case KEY_RSA1:
390 /* Get number of bits. */
391 if (*cp < '0' || *cp > '9')
392 return -1; /* Bad bit count... */
393 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
394 bits = 10 * bits + *cp - '0';
395 if (bits == 0)
396 return -1;
397 *cpp = cp;
398 /* Get public exponent, public modulus. */
399 if (!read_bignum(cpp, ret->rsa->e))
400 return -1;
401 if (!read_bignum(cpp, ret->rsa->n))
402 return -1;
403 success = 1;
404 break;
405 case KEY_UNSPEC:
406 case KEY_RSA:
407 case KEY_DSA:
408 space = strchr(cp, ' ');
409 if (space == NULL) {
410 debug3("key_read: no space");
411 return -1;
412 }
413 *space = '\0';
414 type = key_type_from_name(cp);
415 *space = ' ';
416 if (type == KEY_UNSPEC) {
417 debug3("key_read: no key found");
418 return -1;
419 }
420 cp = space+1;
421 if (*cp == '\0') {
422 debug3("key_read: short string");
423 return -1;
424 }
425 if (ret->type == KEY_UNSPEC) {
426 ret->type = type;
427 } else if (ret->type != type) {
428 /* is a key, but different type */
429 debug3("key_read: type mismatch");
430 return -1;
431 }
432 len = 2*strlen(cp);
433 blob = xmalloc(len);
434 n = uudecode(cp, blob, len);
435 if (n < 0) {
436 error("key_read: uudecode %s failed", cp);
1e608e42 437 xfree(blob);
3c0ef626 438 return -1;
439 }
440 k = key_from_blob(blob, n);
1e608e42 441 xfree(blob);
3c0ef626 442 if (k == NULL) {
443 error("key_read: key_from_blob %s failed", cp);
444 return -1;
445 }
3c0ef626 446 if (k->type != type) {
447 error("key_read: type mismatch: encoding error");
448 key_free(k);
449 return -1;
450 }
451/*XXXX*/
452 if (ret->type == KEY_RSA) {
453 if (ret->rsa != NULL)
454 RSA_free(ret->rsa);
455 ret->rsa = k->rsa;
456 k->rsa = NULL;
457 success = 1;
458#ifdef DEBUG_PK
459 RSA_print_fp(stderr, ret->rsa, 8);
460#endif
461 } else {
462 if (ret->dsa != NULL)
463 DSA_free(ret->dsa);
464 ret->dsa = k->dsa;
465 k->dsa = NULL;
466 success = 1;
467#ifdef DEBUG_PK
468 DSA_print_fp(stderr, ret->dsa, 8);
469#endif
470 }
471/*XXXX*/
1e608e42 472 key_free(k);
3c0ef626 473 if (success != 1)
474 break;
3c0ef626 475 /* advance cp: skip whitespace and data */
476 while (*cp == ' ' || *cp == '\t')
477 cp++;
478 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
479 cp++;
480 *cpp = cp;
481 break;
482 default:
483 fatal("key_read: bad key type: %d", ret->type);
484 break;
485 }
486 return success;
487}
488int
489key_write(Key *key, FILE *f)
490{
1e608e42 491 int n, success = 0;
492 u_int len, bits = 0;
493 u_char *blob, *uu;
3c0ef626 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)) {
3c0ef626 507 key_to_blob(key, &blob, &len);
508 uu = xmalloc(2*len);
509 n = uuencode(blob, len, uu, 2*len);
510 if (n > 0) {
511 fprintf(f, "%s %s", key_ssh_name(key), uu);
512 success = 1;
513 }
514 xfree(blob);
515 xfree(uu);
516 }
517 return success;
518}
519char *
520key_type(Key *k)
521{
522 switch (k->type) {
523 case KEY_RSA1:
524 return "RSA1";
525 break;
526 case KEY_RSA:
527 return "RSA";
528 break;
529 case KEY_DSA:
530 return "DSA";
531 break;
532 }
533 return "unknown";
534}
535char *
536key_ssh_name(Key *k)
537{
538 switch (k->type) {
539 case KEY_RSA:
540 return "ssh-rsa";
541 break;
542 case KEY_DSA:
543 return "ssh-dss";
544 break;
545 }
546 return "ssh-unknown";
547}
548u_int
1e608e42 549key_size(Key *k)
550{
3c0ef626 551 switch (k->type) {
552 case KEY_RSA1:
553 case KEY_RSA:
554 return BN_num_bits(k->rsa->n);
555 break;
556 case KEY_DSA:
557 return BN_num_bits(k->dsa->p);
558 break;
559 }
560 return 0;
561}
562
563static RSA *
564rsa_generate_private_key(u_int bits)
565{
566 RSA *private;
567 private = RSA_generate_key(bits, 35, NULL, NULL);
568 if (private == NULL)
569 fatal("rsa_generate_private_key: key generation failed.");
570 return private;
571}
572
573static DSA*
574dsa_generate_private_key(u_int bits)
575{
576 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
577 if (private == NULL)
578 fatal("dsa_generate_private_key: DSA_generate_parameters failed");
579 if (!DSA_generate_key(private))
580 fatal("dsa_generate_private_key: DSA_generate_key failed.");
581 if (private == NULL)
582 fatal("dsa_generate_private_key: NULL.");
583 return private;
584}
585
586Key *
587key_generate(int type, u_int bits)
588{
589 Key *k = key_new(KEY_UNSPEC);
590 switch (type) {
591 case KEY_DSA:
592 k->dsa = dsa_generate_private_key(bits);
593 break;
594 case KEY_RSA:
595 case KEY_RSA1:
596 k->rsa = rsa_generate_private_key(bits);
597 break;
598 default:
599 fatal("key_generate: unknown type %d", type);
600 }
601 k->type = type;
602 return k;
603}
604
605Key *
606key_from_private(Key *k)
607{
608 Key *n = NULL;
609 switch (k->type) {
610 case KEY_DSA:
611 n = key_new(k->type);
612 BN_copy(n->dsa->p, k->dsa->p);
613 BN_copy(n->dsa->q, k->dsa->q);
614 BN_copy(n->dsa->g, k->dsa->g);
615 BN_copy(n->dsa->pub_key, k->dsa->pub_key);
616 break;
617 case KEY_RSA:
618 case KEY_RSA1:
619 n = key_new(k->type);
620 BN_copy(n->rsa->n, k->rsa->n);
621 BN_copy(n->rsa->e, k->rsa->e);
622 break;
623 default:
624 fatal("key_from_private: unknown type %d", k->type);
625 break;
626 }
627 return n;
628}
629
630int
631key_type_from_name(char *name)
632{
1e608e42 633 if (strcmp(name, "rsa1") == 0) {
3c0ef626 634 return KEY_RSA1;
1e608e42 635 } else if (strcmp(name, "rsa") == 0) {
3c0ef626 636 return KEY_RSA;
1e608e42 637 } else if (strcmp(name, "dsa") == 0) {
3c0ef626 638 return KEY_DSA;
1e608e42 639 } else if (strcmp(name, "ssh-rsa") == 0) {
3c0ef626 640 return KEY_RSA;
1e608e42 641 } else if (strcmp(name, "ssh-dss") == 0) {
3c0ef626 642 return KEY_DSA;
5598e598 643 } else if (strcmp(name, "null") == 0){
644 return KEY_NULL;
3c0ef626 645 }
646 debug2("key_type_from_name: unknown key type '%s'", name);
647 return KEY_UNSPEC;
648}
649
650int
651key_names_valid2(const char *names)
652{
653 char *s, *cp, *p;
654
655 if (names == NULL || strcmp(names, "") == 0)
656 return 0;
657 s = cp = xstrdup(names);
658 for ((p = strsep(&cp, ",")); p && *p != '\0';
1e608e42 659 (p = strsep(&cp, ","))) {
3c0ef626 660 switch (key_type_from_name(p)) {
661 case KEY_RSA1:
662 case KEY_UNSPEC:
663 xfree(s);
664 return 0;
665 }
666 }
667 debug3("key names ok: [%s]", names);
668 xfree(s);
669 return 1;
670}
671
672Key *
673key_from_blob(u_char *blob, int blen)
674{
675 Buffer b;
676 char *ktype;
677 int rlen, type;
678 Key *key = NULL;
679
680#ifdef DEBUG_PK
681 dump_base64(stderr, blob, blen);
682#endif
683 buffer_init(&b);
684 buffer_append(&b, blob, blen);
685 ktype = buffer_get_string(&b, NULL);
686 type = key_type_from_name(ktype);
687
1e608e42 688 switch (type) {
3c0ef626 689 case KEY_RSA:
690 key = key_new(type);
691 buffer_get_bignum2(&b, key->rsa->e);
692 buffer_get_bignum2(&b, key->rsa->n);
693#ifdef DEBUG_PK
694 RSA_print_fp(stderr, key->rsa, 8);
695#endif
696 break;
697 case KEY_DSA:
698 key = key_new(type);
699 buffer_get_bignum2(&b, key->dsa->p);
700 buffer_get_bignum2(&b, key->dsa->q);
701 buffer_get_bignum2(&b, key->dsa->g);
702 buffer_get_bignum2(&b, key->dsa->pub_key);
703#ifdef DEBUG_PK
704 DSA_print_fp(stderr, key->dsa, 8);
705#endif
706 break;
707 case KEY_UNSPEC:
708 key = key_new(type);
709 break;
710 default:
711 error("key_from_blob: cannot handle type %s", ktype);
712 break;
713 }
714 rlen = buffer_len(&b);
715 if (key != NULL && rlen != 0)
716 error("key_from_blob: remaining bytes in key blob %d", rlen);
717 xfree(ktype);
718 buffer_free(&b);
719 return key;
720}
721
722int
723key_to_blob(Key *key, u_char **blobp, u_int *lenp)
724{
725 Buffer b;
726 int len;
727 u_char *buf;
728
729 if (key == NULL) {
730 error("key_to_blob: key == NULL");
731 return 0;
732 }
733 buffer_init(&b);
1e608e42 734 switch (key->type) {
3c0ef626 735 case KEY_DSA:
736 buffer_put_cstring(&b, key_ssh_name(key));
737 buffer_put_bignum2(&b, key->dsa->p);
738 buffer_put_bignum2(&b, key->dsa->q);
739 buffer_put_bignum2(&b, key->dsa->g);
740 buffer_put_bignum2(&b, key->dsa->pub_key);
741 break;
742 case KEY_RSA:
743 buffer_put_cstring(&b, key_ssh_name(key));
744 buffer_put_bignum2(&b, key->rsa->e);
745 buffer_put_bignum2(&b, key->rsa->n);
746 break;
747 default:
748 error("key_to_blob: unsupported key type %d", key->type);
749 buffer_free(&b);
750 return 0;
751 }
752 len = buffer_len(&b);
753 buf = xmalloc(len);
754 memcpy(buf, buffer_ptr(&b), len);
755 memset(buffer_ptr(&b), 0, len);
756 buffer_free(&b);
757 if (lenp != NULL)
758 *lenp = len;
759 if (blobp != NULL)
760 *blobp = buf;
761 return len;
762}
763
764int
765key_sign(
766 Key *key,
1e608e42 767 u_char **sigp, u_int *lenp,
768 u_char *data, u_int datalen)
3c0ef626 769{
1e608e42 770 switch (key->type) {
3c0ef626 771 case KEY_DSA:
772 return ssh_dss_sign(key, sigp, lenp, data, datalen);
773 break;
774 case KEY_RSA:
775 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
776 break;
777 default:
778 error("key_sign: illegal key type %d", key->type);
779 return -1;
780 break;
781 }
782}
783
784int
785key_verify(
786 Key *key,
1e608e42 787 u_char *signature, u_int signaturelen,
788 u_char *data, u_int datalen)
3c0ef626 789{
790 if (signaturelen == 0)
791 return -1;
792
1e608e42 793 switch (key->type) {
3c0ef626 794 case KEY_DSA:
795 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
796 break;
797 case KEY_RSA:
798 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
799 break;
800 default:
801 error("key_verify: illegal key type %d", key->type);
802 return -1;
803 break;
804 }
805}
510132b6 806
807/* Converts a private to a public key */
808
809Key *
810key_demote(Key *k)
811{
812 Key *pk;
813
814 pk = xmalloc(sizeof(*pk));
815 pk->type = k->type;
816 pk->flags = k->flags;
817 pk->dsa = NULL;
818 pk->rsa = NULL;
819
820 switch (k->type) {
821 case KEY_RSA1:
822 case KEY_RSA:
823 if ((pk->rsa = RSA_new()) == NULL)
824 fatal("key_demote: RSA_new failed");
825 if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
826 fatal("key_demote: BN_dup failed");
827 if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
828 fatal("key_demote: BN_dup failed");
829 break;
830 case KEY_DSA:
831 if ((pk->dsa = DSA_new()) == NULL)
832 fatal("key_demote: DSA_new failed");
833 if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
834 fatal("key_demote: BN_dup failed");
835 if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
836 fatal("key_demote: BN_dup failed");
837 if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
838 fatal("key_demote: BN_dup failed");
839 if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
840 fatal("key_demote: BN_dup failed");
841 break;
842 default:
843 fatal("key_free: bad key type %d", k->type);
844 break;
845 }
846
847 return (pk);
848}
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