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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"
35RCSID("$OpenBSD: key.c,v 1.25 2001/04/17 10:53:24 markus 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
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->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}
83Key *
84key_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}
107void
108key_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}
130int
131key_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
156u_char*
157key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length)
158{
159 EVP_MD *md = NULL;
160 EVP_MD_CTX ctx;
161 u_char *blob = NULL;
162 u_char *retval = NULL;
163 int len = 0;
164 int nlen, elen;
165
166 *dgst_raw_length = 0;
167
168 switch (dgst_type) {
169 case SSH_FP_MD5:
170 md = EVP_md5();
171 break;
172 case SSH_FP_SHA1:
173 md = EVP_sha1();
174 break;
175 default:
176 fatal("key_fingerprint_raw: bad digest type %d",
177 dgst_type);
178 }
179 switch (k->type) {
180 case KEY_RSA1:
181 nlen = BN_num_bytes(k->rsa->n);
182 elen = BN_num_bytes(k->rsa->e);
183 len = nlen + elen;
184 blob = xmalloc(len);
185 BN_bn2bin(k->rsa->n, blob);
186 BN_bn2bin(k->rsa->e, blob + nlen);
187 break;
188 case KEY_DSA:
189 case KEY_RSA:
190 key_to_blob(k, &blob, &len);
191 break;
192 case KEY_UNSPEC:
193 return retval;
194 break;
195 default:
196 fatal("key_fingerprint_raw: bad key type %d", k->type);
197 break;
198 }
199 if (blob != NULL) {
200 retval = xmalloc(EVP_MAX_MD_SIZE);
201 EVP_DigestInit(&ctx, md);
202 EVP_DigestUpdate(&ctx, blob, len);
203 EVP_DigestFinal(&ctx, retval, NULL);
204 *dgst_raw_length = md->md_size;
205 memset(blob, 0, len);
206 xfree(blob);
207 } else {
208 fatal("key_fingerprint_raw: blob is null");
209 }
210 return retval;
211}
212
213char*
214key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
215{
216 char *retval;
217 int i;
218
219 retval = xmalloc(dgst_raw_len * 3 + 1);
220 retval[0] = '\0';
221 for(i = 0; i < dgst_raw_len; i++) {
222 char hex[4];
223 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
224 strlcat(retval, hex, dgst_raw_len * 3);
225 }
226 retval[(dgst_raw_len * 3) - 1] = '\0';
227 return retval;
228}
229
230char*
231key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
232{
233 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
234 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
235 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
236 u_int i, j = 0, rounds, seed = 1;
237 char *retval;
238
239 rounds = (dgst_raw_len / 2) + 1;
240 retval = xmalloc(sizeof(char) * (rounds*6));
241 retval[j++] = 'x';
242 for (i = 0; i < rounds; i++) {
243 u_int idx0, idx1, idx2, idx3, idx4;
244 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
245 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
246 seed) % 6;
247 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
248 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
249 (seed / 6)) % 6;
250 retval[j++] = vowels[idx0];
251 retval[j++] = consonants[idx1];
252 retval[j++] = vowels[idx2];
253 if ((i + 1) < rounds) {
254 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
255 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
256 retval[j++] = consonants[idx3];
257 retval[j++] = '-';
258 retval[j++] = consonants[idx4];
259 seed = ((seed * 5) +
260 ((((u_int)(dgst_raw[2 * i])) * 7) +
261 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
262 }
263 } else {
264 idx0 = seed % 6;
265 idx1 = 16;
266 idx2 = seed / 6;
267 retval[j++] = vowels[idx0];
268 retval[j++] = consonants[idx1];
269 retval[j++] = vowels[idx2];
270 }
271 }
272 retval[j++] = 'x';
273 retval[j++] = '\0';
274 return retval;
275}
276
277char*
278key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
279{
280 char *retval = NULL;
281 u_char *dgst_raw;
282 size_t dgst_raw_len;
283
284 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
285 if (!dgst_raw)
286 fatal("key_fingerprint: null from key_fingerprint_raw()");
287 switch(dgst_rep) {
288 case SSH_FP_HEX:
289 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
290 break;
291 case SSH_FP_BUBBLEBABBLE:
292 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
293 break;
294 default:
295 fatal("key_fingerprint_ex: bad digest representation %d",
296 dgst_rep);
297 break;
298 }
299 memset(dgst_raw, 0, dgst_raw_len);
300 xfree(dgst_raw);
301 return retval;
302}
303
304/*
305 * Reads a multiple-precision integer in decimal from the buffer, and advances
306 * the pointer. The integer must already be initialized. This function is
307 * permitted to modify the buffer. This leaves *cpp to point just beyond the
308 * last processed (and maybe modified) character. Note that this may modify
309 * the buffer containing the number.
310 */
311int
312read_bignum(char **cpp, BIGNUM * value)
313{
314 char *cp = *cpp;
315 int old;
316
317 /* Skip any leading whitespace. */
318 for (; *cp == ' ' || *cp == '\t'; cp++)
319 ;
320
321 /* Check that it begins with a decimal digit. */
322 if (*cp < '0' || *cp > '9')
323 return 0;
324
325 /* Save starting position. */
326 *cpp = cp;
327
328 /* Move forward until all decimal digits skipped. */
329 for (; *cp >= '0' && *cp <= '9'; cp++)
330 ;
331
332 /* Save the old terminating character, and replace it by \0. */
333 old = *cp;
334 *cp = 0;
335
336 /* Parse the number. */
337 if (BN_dec2bn(&value, *cpp) == 0)
338 return 0;
339
340 /* Restore old terminating character. */
341 *cp = old;
342
343 /* Move beyond the number and return success. */
344 *cpp = cp;
345 return 1;
346}
347int
348write_bignum(FILE *f, BIGNUM *num)
349{
350 char *buf = BN_bn2dec(num);
351 if (buf == NULL) {
352 error("write_bignum: BN_bn2dec() failed");
353 return 0;
354 }
355 fprintf(f, " %s", buf);
356 xfree(buf);
357 return 1;
358}
359
360/* returns 1 ok, -1 error, 0 type mismatch */
361int
362key_read(Key *ret, char **cpp)
363{
364 Key *k;
365 int success = -1;
366 char *cp, *space;
367 int len, n, type;
368 u_int bits;
369 u_char *blob;
370
371 cp = *cpp;
372
373 switch(ret->type) {
374 case KEY_RSA1:
375 /* Get number of bits. */
376 if (*cp < '0' || *cp > '9')
377 return -1; /* Bad bit count... */
378 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
379 bits = 10 * bits + *cp - '0';
380 if (bits == 0)
381 return -1;
382 *cpp = cp;
383 /* Get public exponent, public modulus. */
384 if (!read_bignum(cpp, ret->rsa->e))
385 return -1;
386 if (!read_bignum(cpp, ret->rsa->n))
387 return -1;
388 success = 1;
389 break;
390 case KEY_UNSPEC:
391 case KEY_RSA:
392 case KEY_DSA:
393 space = strchr(cp, ' ');
394 if (space == NULL) {
395 debug3("key_read: no space");
396 return -1;
397 }
398 *space = '\0';
399 type = key_type_from_name(cp);
400 *space = ' ';
401 if (type == KEY_UNSPEC) {
402 debug3("key_read: no key found");
403 return -1;
404 }
405 cp = space+1;
406 if (*cp == '\0') {
407 debug3("key_read: short string");
408 return -1;
409 }
410 if (ret->type == KEY_UNSPEC) {
411 ret->type = type;
412 } else if (ret->type != type) {
413 /* is a key, but different type */
414 debug3("key_read: type mismatch");
415 return 0;
416 }
417 len = 2*strlen(cp);
418 blob = xmalloc(len);
419 n = uudecode(cp, blob, len);
420 if (n < 0) {
421 error("key_read: uudecode %s failed", cp);
422 return -1;
423 }
424 k = key_from_blob(blob, n);
425 if (k == NULL) {
426 error("key_read: key_from_blob %s failed", cp);
427 return -1;
428 }
429 xfree(blob);
430 if (k->type != type) {
431 error("key_read: type mismatch: encoding error");
432 key_free(k);
433 return -1;
434 }
435/*XXXX*/
436 if (ret->type == KEY_RSA) {
437 if (ret->rsa != NULL)
438 RSA_free(ret->rsa);
439 ret->rsa = k->rsa;
440 k->rsa = NULL;
441 success = 1;
442#ifdef DEBUG_PK
443 RSA_print_fp(stderr, ret->rsa, 8);
444#endif
445 } else {
446 if (ret->dsa != NULL)
447 DSA_free(ret->dsa);
448 ret->dsa = k->dsa;
449 k->dsa = NULL;
450 success = 1;
451#ifdef DEBUG_PK
452 DSA_print_fp(stderr, ret->dsa, 8);
453#endif
454 }
455/*XXXX*/
456 if (success != 1)
457 break;
458 key_free(k);
459 /* advance cp: skip whitespace and data */
460 while (*cp == ' ' || *cp == '\t')
461 cp++;
462 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
463 cp++;
464 *cpp = cp;
465 break;
466 default:
467 fatal("key_read: bad key type: %d", ret->type);
468 break;
469 }
470 return success;
471}
472int
473key_write(Key *key, FILE *f)
474{
475 int success = 0;
476 u_int bits = 0;
477
478 if (key->type == KEY_RSA1 && key->rsa != NULL) {
479 /* size of modulus 'n' */
480 bits = BN_num_bits(key->rsa->n);
481 fprintf(f, "%u", bits);
482 if (write_bignum(f, key->rsa->e) &&
483 write_bignum(f, key->rsa->n)) {
484 success = 1;
485 } else {
486 error("key_write: failed for RSA key");
487 }
488 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
489 (key->type == KEY_RSA && key->rsa != NULL)) {
490 int len, n;
491 u_char *blob, *uu;
492 key_to_blob(key, &blob, &len);
493 uu = xmalloc(2*len);
494 n = uuencode(blob, len, uu, 2*len);
495 if (n > 0) {
496 fprintf(f, "%s %s", key_ssh_name(key), uu);
497 success = 1;
498 }
499 xfree(blob);
500 xfree(uu);
501 }
502 return success;
503}
504char *
505key_type(Key *k)
506{
507 switch (k->type) {
508 case KEY_RSA1:
509 return "RSA1";
510 break;
511 case KEY_RSA:
512 return "RSA";
513 break;
514 case KEY_DSA:
515 return "DSA";
516 break;
517 }
518 return "unknown";
519}
520char *
521key_ssh_name(Key *k)
522{
523 switch (k->type) {
524 case KEY_RSA:
525 return "ssh-rsa";
526 break;
527 case KEY_DSA:
528 return "ssh-dss";
529 break;
530 }
531 return "ssh-unknown";
532}
533u_int
534key_size(Key *k){
535 switch (k->type) {
536 case KEY_RSA1:
537 case KEY_RSA:
538 return BN_num_bits(k->rsa->n);
539 break;
540 case KEY_DSA:
541 return BN_num_bits(k->dsa->p);
542 break;
543 }
544 return 0;
545}
546
547RSA *
548rsa_generate_private_key(u_int bits)
549{
550 RSA *private;
551 private = RSA_generate_key(bits, 35, NULL, NULL);
552 if (private == NULL)
553 fatal("rsa_generate_private_key: key generation failed.");
554 return private;
555}
556
557DSA*
558dsa_generate_private_key(u_int bits)
559{
560 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
561 if (private == NULL)
562 fatal("dsa_generate_private_key: DSA_generate_parameters failed");
563 if (!DSA_generate_key(private))
564 fatal("dsa_generate_private_key: DSA_generate_key failed.");
565 if (private == NULL)
566 fatal("dsa_generate_private_key: NULL.");
567 return private;
568}
569
570Key *
571key_generate(int type, u_int bits)
572{
573 Key *k = key_new(KEY_UNSPEC);
574 switch (type) {
575 case KEY_DSA:
576 k->dsa = dsa_generate_private_key(bits);
577 break;
578 case KEY_RSA:
579 case KEY_RSA1:
580 k->rsa = rsa_generate_private_key(bits);
581 break;
582 default:
583 fatal("key_generate: unknown type %d", type);
584 }
585 k->type = type;
586 return k;
587}
588
589Key *
590key_from_private(Key *k)
591{
592 Key *n = NULL;
593 switch (k->type) {
594 case KEY_DSA:
595 n = key_new(k->type);
596 BN_copy(n->dsa->p, k->dsa->p);
597 BN_copy(n->dsa->q, k->dsa->q);
598 BN_copy(n->dsa->g, k->dsa->g);
599 BN_copy(n->dsa->pub_key, k->dsa->pub_key);
600 break;
601 case KEY_RSA:
602 case KEY_RSA1:
603 n = key_new(k->type);
604 BN_copy(n->rsa->n, k->rsa->n);
605 BN_copy(n->rsa->e, k->rsa->e);
606 break;
607 default:
608 fatal("key_from_private: unknown type %d", k->type);
609 break;
610 }
611 return n;
612}
613
614int
615key_type_from_name(char *name)
616{
617 if (strcmp(name, "rsa1") == 0){
618 return KEY_RSA1;
619 } else if (strcmp(name, "rsa") == 0){
620 return KEY_RSA;
621 } else if (strcmp(name, "dsa") == 0){
622 return KEY_DSA;
623 } else if (strcmp(name, "ssh-rsa") == 0){
624 return KEY_RSA;
625 } else if (strcmp(name, "ssh-dss") == 0){
626 return KEY_DSA;
627 }
628 debug2("key_type_from_name: unknown key type '%s'", name);
629 return KEY_UNSPEC;
630}
631
632int
633key_names_valid2(const char *names)
634{
635 char *s, *cp, *p;
636
637 if (names == NULL || strcmp(names, "") == 0)
638 return 0;
639 s = cp = xstrdup(names);
640 for ((p = strsep(&cp, ",")); p && *p != '\0';
641 (p = strsep(&cp, ","))) {
642 switch (key_type_from_name(p)) {
643 case KEY_RSA1:
644 case KEY_UNSPEC:
645 xfree(s);
646 return 0;
647 }
648 }
649 debug3("key names ok: [%s]", names);
650 xfree(s);
651 return 1;
652}
653
654Key *
655key_from_blob(char *blob, int blen)
656{
657 Buffer b;
658 char *ktype;
659 int rlen, type;
660 Key *key = NULL;
661
662#ifdef DEBUG_PK
663 dump_base64(stderr, blob, blen);
664#endif
665 buffer_init(&b);
666 buffer_append(&b, blob, blen);
667 ktype = buffer_get_string(&b, NULL);
668 type = key_type_from_name(ktype);
669
670 switch(type){
671 case KEY_RSA:
672 key = key_new(type);
673 buffer_get_bignum2(&b, key->rsa->e);
674 buffer_get_bignum2(&b, key->rsa->n);
675#ifdef DEBUG_PK
676 RSA_print_fp(stderr, key->rsa, 8);
677#endif
678 break;
679 case KEY_DSA:
680 key = key_new(type);
681 buffer_get_bignum2(&b, key->dsa->p);
682 buffer_get_bignum2(&b, key->dsa->q);
683 buffer_get_bignum2(&b, key->dsa->g);
684 buffer_get_bignum2(&b, key->dsa->pub_key);
685#ifdef DEBUG_PK
686 DSA_print_fp(stderr, key->dsa, 8);
687#endif
688 break;
689 case KEY_UNSPEC:
690 key = key_new(type);
691 break;
692 default:
693 error("key_from_blob: cannot handle type %s", ktype);
694 break;
695 }
696 rlen = buffer_len(&b);
697 if (key != NULL && rlen != 0)
698 error("key_from_blob: remaining bytes in key blob %d", rlen);
699 xfree(ktype);
700 buffer_free(&b);
701 return key;
702}
703
704int
705key_to_blob(Key *key, u_char **blobp, u_int *lenp)
706{
707 Buffer b;
708 int len;
709 u_char *buf;
710
711 if (key == NULL) {
712 error("key_to_blob: key == NULL");
713 return 0;
714 }
715 buffer_init(&b);
716 switch(key->type){
717 case KEY_DSA:
718 buffer_put_cstring(&b, key_ssh_name(key));
719 buffer_put_bignum2(&b, key->dsa->p);
720 buffer_put_bignum2(&b, key->dsa->q);
721 buffer_put_bignum2(&b, key->dsa->g);
722 buffer_put_bignum2(&b, key->dsa->pub_key);
723 break;
724 case KEY_RSA:
725 buffer_put_cstring(&b, key_ssh_name(key));
726 buffer_put_bignum2(&b, key->rsa->e);
727 buffer_put_bignum2(&b, key->rsa->n);
728 break;
729 default:
730 error("key_to_blob: illegal key type %d", key->type);
731 break;
732 }
733 len = buffer_len(&b);
734 buf = xmalloc(len);
735 memcpy(buf, buffer_ptr(&b), len);
736 memset(buffer_ptr(&b), 0, len);
737 buffer_free(&b);
738 if (lenp != NULL)
739 *lenp = len;
740 if (blobp != NULL)
741 *blobp = buf;
742 return len;
743}
744
745int
746key_sign(
747 Key *key,
748 u_char **sigp, int *lenp,
749 u_char *data, int datalen)
750{
751 switch(key->type){
752 case KEY_DSA:
753 return ssh_dss_sign(key, sigp, lenp, data, datalen);
754 break;
755 case KEY_RSA:
756 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
757 break;
758 default:
759 error("key_sign: illegal key type %d", key->type);
760 return -1;
761 break;
762 }
763}
764
765int
766key_verify(
767 Key *key,
768 u_char *signature, int signaturelen,
769 u_char *data, int datalen)
770{
771 switch(key->type){
772 case KEY_DSA:
773 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
774 break;
775 case KEY_RSA:
776 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
777 break;
778 default:
779 error("key_verify: illegal key type %d", key->type);
780 return -1;
781 break;
782 }
783}