3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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".
12 * Copyright (c) 2000 Markus Friedl. All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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.
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.
35 RCSID("$OpenBSD: key.c,v 1.26 2001/06/23 05:26:02 markus Exp $");
37 #include <openssl/evp.h>
55 k = xmalloc(sizeof(*k));
72 dsa->pub_key = BN_new();
78 fatal("key_new: bad key type %d", k->type);
84 key_new_private(int type)
86 Key *k = key_new(type);
91 k->rsa->iqmp = BN_new();
94 k->rsa->dmq1 = BN_new();
95 k->rsa->dmp1 = BN_new();
98 k->dsa->priv_key = BN_new();
125 fatal("key_free: bad key type %d", k->type);
131 key_equal(Key *a, Key *b)
133 if (a == NULL || b == NULL || a->type != b->type)
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;
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;
150 fatal("key_equal: bad key type %d", a->type);
157 key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length)
162 u_char *retval = NULL;
166 *dgst_raw_length = 0;
176 fatal("key_fingerprint_raw: bad digest type %d",
181 nlen = BN_num_bytes(k->rsa->n);
182 elen = BN_num_bytes(k->rsa->e);
185 BN_bn2bin(k->rsa->n, blob);
186 BN_bn2bin(k->rsa->e, blob + nlen);
190 key_to_blob(k, &blob, &len);
196 fatal("key_fingerprint_raw: bad key type %d", k->type);
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);
208 fatal("key_fingerprint_raw: blob is null");
214 key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
219 retval = xmalloc(dgst_raw_len * 3 + 1);
221 for(i = 0; i < dgst_raw_len; i++) {
223 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
224 strlcat(retval, hex, dgst_raw_len * 3);
226 retval[(dgst_raw_len * 3) - 1] = '\0';
231 key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
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;
239 rounds = (dgst_raw_len / 2) + 1;
240 retval = xmalloc(sizeof(char) * (rounds*6));
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) +
247 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
248 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
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];
258 retval[j++] = consonants[idx4];
260 ((((u_int)(dgst_raw[2 * i])) * 7) +
261 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
267 retval[j++] = vowels[idx0];
268 retval[j++] = consonants[idx1];
269 retval[j++] = vowels[idx2];
278 key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
284 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
286 fatal("key_fingerprint: null from key_fingerprint_raw()");
289 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
291 case SSH_FP_BUBBLEBABBLE:
292 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
295 fatal("key_fingerprint_ex: bad digest representation %d",
299 memset(dgst_raw, 0, dgst_raw_len);
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.
312 read_bignum(char **cpp, BIGNUM * value)
317 /* Skip any leading whitespace. */
318 for (; *cp == ' ' || *cp == '\t'; cp++)
321 /* Check that it begins with a decimal digit. */
322 if (*cp < '0' || *cp > '9')
325 /* Save starting position. */
328 /* Move forward until all decimal digits skipped. */
329 for (; *cp >= '0' && *cp <= '9'; cp++)
332 /* Save the old terminating character, and replace it by \0. */
336 /* Parse the number. */
337 if (BN_dec2bn(&value, *cpp) == 0)
340 /* Restore old terminating character. */
343 /* Move beyond the number and return success. */
348 write_bignum(FILE *f, BIGNUM *num)
350 char *buf = BN_bn2dec(num);
352 error("write_bignum: BN_bn2dec() failed");
355 fprintf(f, " %s", buf);
360 /* returns 1 ok, -1 error, 0 type mismatch */
362 key_read(Key *ret, char **cpp)
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';
383 /* Get public exponent, public modulus. */
384 if (!read_bignum(cpp, ret->rsa->e))
386 if (!read_bignum(cpp, ret->rsa->n))
393 space = strchr(cp, ' ');
395 debug3("key_read: no space");
399 type = key_type_from_name(cp);
401 if (type == KEY_UNSPEC) {
402 debug3("key_read: no key found");
407 debug3("key_read: short string");
410 if (ret->type == KEY_UNSPEC) {
412 } else if (ret->type != type) {
413 /* is a key, but different type */
414 debug3("key_read: type mismatch");
419 n = uudecode(cp, blob, len);
421 error("key_read: uudecode %s failed", cp);
424 k = key_from_blob(blob, n);
426 error("key_read: key_from_blob %s failed", cp);
430 if (k->type != type) {
431 error("key_read: type mismatch: encoding error");
436 if (ret->type == KEY_RSA) {
437 if (ret->rsa != NULL)
443 RSA_print_fp(stderr, ret->rsa, 8);
446 if (ret->dsa != NULL)
452 DSA_print_fp(stderr, ret->dsa, 8);
459 /* advance cp: skip whitespace and data */
460 while (*cp == ' ' || *cp == '\t')
462 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
467 fatal("key_read: bad key type: %d", ret->type);
473 key_write(Key *key, FILE *f)
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)) {
486 error("key_write: failed for RSA key");
488 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
489 (key->type == KEY_RSA && key->rsa != NULL)) {
492 key_to_blob(key, &blob, &len);
494 n = uuencode(blob, len, uu, 2*len);
496 fprintf(f, "%s %s", key_ssh_name(key), uu);
531 return "ssh-unknown";
538 return BN_num_bits(k->rsa->n);
541 return BN_num_bits(k->dsa->p);
548 rsa_generate_private_key(u_int bits)
551 private = RSA_generate_key(bits, 35, NULL, NULL);
553 fatal("rsa_generate_private_key: key generation failed.");
558 dsa_generate_private_key(u_int bits)
560 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, 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.");
566 fatal("dsa_generate_private_key: NULL.");
571 key_generate(int type, u_int bits)
573 Key *k = key_new(KEY_UNSPEC);
576 k->dsa = dsa_generate_private_key(bits);
580 k->rsa = rsa_generate_private_key(bits);
583 fatal("key_generate: unknown type %d", type);
590 key_from_private(Key *k)
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);
603 n = key_new(k->type);
604 BN_copy(n->rsa->n, k->rsa->n);
605 BN_copy(n->rsa->e, k->rsa->e);
608 fatal("key_from_private: unknown type %d", k->type);
615 key_type_from_name(char *name)
617 if (strcmp(name, "rsa1") == 0){
619 } else if (strcmp(name, "rsa") == 0){
621 } else if (strcmp(name, "dsa") == 0){
623 } else if (strcmp(name, "ssh-rsa") == 0){
625 } else if (strcmp(name, "ssh-dss") == 0){
628 debug2("key_type_from_name: unknown key type '%s'", name);
633 key_names_valid2(const char *names)
637 if (names == NULL || strcmp(names, "") == 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)) {
649 debug3("key names ok: [%s]", names);
655 key_from_blob(char *blob, int blen)
663 dump_base64(stderr, blob, blen);
666 buffer_append(&b, blob, blen);
667 ktype = buffer_get_string(&b, NULL);
668 type = key_type_from_name(ktype);
673 buffer_get_bignum2(&b, key->rsa->e);
674 buffer_get_bignum2(&b, key->rsa->n);
676 RSA_print_fp(stderr, key->rsa, 8);
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);
686 DSA_print_fp(stderr, key->dsa, 8);
693 error("key_from_blob: cannot handle type %s", ktype);
696 rlen = buffer_len(&b);
697 if (key != NULL && rlen != 0)
698 error("key_from_blob: remaining bytes in key blob %d", rlen);
705 key_to_blob(Key *key, u_char **blobp, u_int *lenp)
712 error("key_to_blob: key == NULL");
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);
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);
730 error("key_to_blob: illegal key type %d", key->type);
733 len = buffer_len(&b);
735 memcpy(buf, buffer_ptr(&b), len);
736 memset(buffer_ptr(&b), 0, len);
748 u_char **sigp, int *lenp,
749 u_char *data, int datalen)
753 return ssh_dss_sign(key, sigp, lenp, data, datalen);
756 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
759 error("key_sign: illegal key type %d", key->type);
768 u_char *signature, int signaturelen,
769 u_char *data, int datalen)
771 if (signaturelen == 0)
776 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
779 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
782 error("key_verify: illegal key type %d", key->type);