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, 2001 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 1.55 2003/11/10 16:23:41 jakob Exp $");
37 #include <openssl/evp.h>
53 k = xmalloc(sizeof(*k));
61 if ((rsa = RSA_new()) == NULL)
62 fatal("key_new: RSA_new failed");
63 if ((rsa->n = BN_new()) == NULL)
64 fatal("key_new: BN_new failed");
65 if ((rsa->e = BN_new()) == NULL)
66 fatal("key_new: BN_new failed");
70 if ((dsa = DSA_new()) == NULL)
71 fatal("key_new: DSA_new failed");
72 if ((dsa->p = BN_new()) == NULL)
73 fatal("key_new: BN_new failed");
74 if ((dsa->q = BN_new()) == NULL)
75 fatal("key_new: BN_new failed");
76 if ((dsa->g = BN_new()) == NULL)
77 fatal("key_new: BN_new failed");
78 if ((dsa->pub_key = BN_new()) == NULL)
79 fatal("key_new: BN_new failed");
85 fatal("key_new: bad key type %d", k->type);
92 key_new_private(int type)
94 Key *k = key_new(type);
98 if ((k->rsa->d = BN_new()) == NULL)
99 fatal("key_new_private: BN_new failed");
100 if ((k->rsa->iqmp = BN_new()) == NULL)
101 fatal("key_new_private: BN_new failed");
102 if ((k->rsa->q = BN_new()) == NULL)
103 fatal("key_new_private: BN_new failed");
104 if ((k->rsa->p = BN_new()) == NULL)
105 fatal("key_new_private: BN_new failed");
106 if ((k->rsa->dmq1 = BN_new()) == NULL)
107 fatal("key_new_private: BN_new failed");
108 if ((k->rsa->dmp1 = BN_new()) == NULL)
109 fatal("key_new_private: BN_new failed");
112 if ((k->dsa->priv_key = BN_new()) == NULL)
113 fatal("key_new_private: BN_new failed");
141 fatal("key_free: bad key type %d", k->type);
148 key_equal(const Key *a, const Key *b)
150 if (a == NULL || b == NULL || a->type != b->type)
155 return a->rsa != NULL && b->rsa != NULL &&
156 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
157 BN_cmp(a->rsa->n, b->rsa->n) == 0;
160 return a->dsa != NULL && b->dsa != NULL &&
161 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
162 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
163 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
164 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
167 fatal("key_equal: bad key type %d", a->type);
174 key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
175 u_int *dgst_raw_length)
177 const EVP_MD *md = NULL;
180 u_char *retval = NULL;
184 *dgst_raw_length = 0;
194 fatal("key_fingerprint_raw: bad digest type %d",
199 nlen = BN_num_bytes(k->rsa->n);
200 elen = BN_num_bytes(k->rsa->e);
203 BN_bn2bin(k->rsa->n, blob);
204 BN_bn2bin(k->rsa->e, blob + nlen);
208 key_to_blob(k, &blob, &len);
214 fatal("key_fingerprint_raw: bad key type %d", k->type);
218 retval = xmalloc(EVP_MAX_MD_SIZE);
219 EVP_DigestInit(&ctx, md);
220 EVP_DigestUpdate(&ctx, blob, len);
221 EVP_DigestFinal(&ctx, retval, dgst_raw_length);
222 memset(blob, 0, len);
225 fatal("key_fingerprint_raw: blob is null");
231 key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
236 retval = xmalloc(dgst_raw_len * 3 + 1);
238 for (i = 0; i < dgst_raw_len; i++) {
240 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
241 strlcat(retval, hex, dgst_raw_len * 3 + 1);
244 /* Remove the trailing ':' character */
245 retval[(dgst_raw_len * 3) - 1] = '\0';
250 key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
252 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
253 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
254 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
255 u_int i, j = 0, rounds, seed = 1;
258 rounds = (dgst_raw_len / 2) + 1;
259 retval = xmalloc(sizeof(char) * (rounds*6));
261 for (i = 0; i < rounds; i++) {
262 u_int idx0, idx1, idx2, idx3, idx4;
263 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
264 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
266 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
267 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
269 retval[j++] = vowels[idx0];
270 retval[j++] = consonants[idx1];
271 retval[j++] = vowels[idx2];
272 if ((i + 1) < rounds) {
273 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
274 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
275 retval[j++] = consonants[idx3];
277 retval[j++] = consonants[idx4];
279 ((((u_int)(dgst_raw[2 * i])) * 7) +
280 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
286 retval[j++] = vowels[idx0];
287 retval[j++] = consonants[idx1];
288 retval[j++] = vowels[idx2];
297 key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
303 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
305 fatal("key_fingerprint: null from key_fingerprint_raw()");
308 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
310 case SSH_FP_BUBBLEBABBLE:
311 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
314 fatal("key_fingerprint_ex: bad digest representation %d",
318 memset(dgst_raw, 0, dgst_raw_len);
324 * Reads a multiple-precision integer in decimal from the buffer, and advances
325 * the pointer. The integer must already be initialized. This function is
326 * permitted to modify the buffer. This leaves *cpp to point just beyond the
327 * last processed (and maybe modified) character. Note that this may modify
328 * the buffer containing the number.
331 read_bignum(char **cpp, BIGNUM * value)
336 /* Skip any leading whitespace. */
337 for (; *cp == ' ' || *cp == '\t'; cp++)
340 /* Check that it begins with a decimal digit. */
341 if (*cp < '0' || *cp > '9')
344 /* Save starting position. */
347 /* Move forward until all decimal digits skipped. */
348 for (; *cp >= '0' && *cp <= '9'; cp++)
351 /* Save the old terminating character, and replace it by \0. */
355 /* Parse the number. */
356 if (BN_dec2bn(&value, *cpp) == 0)
359 /* Restore old terminating character. */
362 /* Move beyond the number and return success. */
368 write_bignum(FILE *f, BIGNUM *num)
370 char *buf = BN_bn2dec(num);
372 error("write_bignum: BN_bn2dec() failed");
375 fprintf(f, " %s", buf);
380 /* returns 1 ok, -1 error */
382 key_read(Key *ret, char **cpp)
395 /* Get number of bits. */
396 if (*cp < '0' || *cp > '9')
397 return -1; /* Bad bit count... */
398 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
399 bits = 10 * bits + *cp - '0';
403 /* Get public exponent, public modulus. */
404 if (!read_bignum(cpp, ret->rsa->e))
406 if (!read_bignum(cpp, ret->rsa->n))
413 space = strchr(cp, ' ');
415 debug3("key_read: missing whitespace");
419 type = key_type_from_name(cp);
421 if (type == KEY_UNSPEC) {
422 debug3("key_read: missing keytype");
427 debug3("key_read: short string");
430 if (ret->type == KEY_UNSPEC) {
432 } else if (ret->type != type) {
433 /* is a key, but different type */
434 debug3("key_read: type mismatch");
439 n = uudecode(cp, blob, len);
441 error("key_read: uudecode %s failed", cp);
445 k = key_from_blob(blob, (u_int)n);
448 error("key_read: key_from_blob %s failed", cp);
451 if (k->type != type) {
452 error("key_read: type mismatch: encoding error");
457 if (ret->type == KEY_RSA) {
458 if (ret->rsa != NULL)
464 RSA_print_fp(stderr, ret->rsa, 8);
467 if (ret->dsa != NULL)
473 DSA_print_fp(stderr, ret->dsa, 8);
480 /* advance cp: skip whitespace and data */
481 while (*cp == ' ' || *cp == '\t')
483 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
488 fatal("key_read: bad key type: %d", ret->type);
495 key_write(const Key *key, FILE *f)
502 if (key->type == KEY_RSA1 && key->rsa != NULL) {
503 /* size of modulus 'n' */
504 bits = BN_num_bits(key->rsa->n);
505 fprintf(f, "%u", bits);
506 if (write_bignum(f, key->rsa->e) &&
507 write_bignum(f, key->rsa->n)) {
510 error("key_write: failed for RSA key");
512 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
513 (key->type == KEY_RSA && key->rsa != NULL)) {
514 key_to_blob(key, &blob, &len);
516 n = uuencode(blob, len, uu, 2*len);
518 fprintf(f, "%s %s", key_ssh_name(key), uu);
528 key_type(const Key *k)
545 key_ssh_name(const Key *k)
555 return "ssh-unknown";
559 key_size(const Key *k)
564 return BN_num_bits(k->rsa->n);
567 return BN_num_bits(k->dsa->p);
574 rsa_generate_private_key(u_int bits)
577 private = RSA_generate_key(bits, 35, NULL, NULL);
579 fatal("rsa_generate_private_key: key generation failed.");
584 dsa_generate_private_key(u_int bits)
586 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
588 fatal("dsa_generate_private_key: DSA_generate_parameters failed");
589 if (!DSA_generate_key(private))
590 fatal("dsa_generate_private_key: DSA_generate_key failed.");
592 fatal("dsa_generate_private_key: NULL.");
597 key_generate(int type, u_int bits)
599 Key *k = key_new(KEY_UNSPEC);
602 k->dsa = dsa_generate_private_key(bits);
606 k->rsa = rsa_generate_private_key(bits);
609 fatal("key_generate: unknown type %d", type);
616 key_from_private(const Key *k)
621 n = key_new(k->type);
622 BN_copy(n->dsa->p, k->dsa->p);
623 BN_copy(n->dsa->q, k->dsa->q);
624 BN_copy(n->dsa->g, k->dsa->g);
625 BN_copy(n->dsa->pub_key, k->dsa->pub_key);
629 n = key_new(k->type);
630 BN_copy(n->rsa->n, k->rsa->n);
631 BN_copy(n->rsa->e, k->rsa->e);
634 fatal("key_from_private: unknown type %d", k->type);
641 key_type_from_name(char *name)
643 if (strcmp(name, "rsa1") == 0) {
645 } else if (strcmp(name, "rsa") == 0) {
647 } else if (strcmp(name, "dsa") == 0) {
649 } else if (strcmp(name, "ssh-rsa") == 0) {
651 } else if (strcmp(name, "ssh-dss") == 0) {
654 debug2("key_type_from_name: unknown key type '%s'", name);
659 key_names_valid2(const char *names)
663 if (names == NULL || strcmp(names, "") == 0)
665 s = cp = xstrdup(names);
666 for ((p = strsep(&cp, ",")); p && *p != '\0';
667 (p = strsep(&cp, ","))) {
668 switch (key_type_from_name(p)) {
675 debug3("key names ok: [%s]", names);
681 key_from_blob(const u_char *blob, u_int blen)
689 dump_base64(stderr, blob, blen);
692 buffer_append(&b, blob, blen);
693 ktype = buffer_get_string(&b, NULL);
694 type = key_type_from_name(ktype);
699 buffer_get_bignum2(&b, key->rsa->e);
700 buffer_get_bignum2(&b, key->rsa->n);
702 RSA_print_fp(stderr, key->rsa, 8);
707 buffer_get_bignum2(&b, key->dsa->p);
708 buffer_get_bignum2(&b, key->dsa->q);
709 buffer_get_bignum2(&b, key->dsa->g);
710 buffer_get_bignum2(&b, key->dsa->pub_key);
712 DSA_print_fp(stderr, key->dsa, 8);
719 error("key_from_blob: cannot handle type %s", ktype);
722 rlen = buffer_len(&b);
723 if (key != NULL && rlen != 0)
724 error("key_from_blob: remaining bytes in key blob %d", rlen);
731 key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
737 error("key_to_blob: key == NULL");
743 buffer_put_cstring(&b, key_ssh_name(key));
744 buffer_put_bignum2(&b, key->dsa->p);
745 buffer_put_bignum2(&b, key->dsa->q);
746 buffer_put_bignum2(&b, key->dsa->g);
747 buffer_put_bignum2(&b, key->dsa->pub_key);
750 buffer_put_cstring(&b, key_ssh_name(key));
751 buffer_put_bignum2(&b, key->rsa->e);
752 buffer_put_bignum2(&b, key->rsa->n);
755 error("key_to_blob: unsupported key type %d", key->type);
759 len = buffer_len(&b);
763 *blobp = xmalloc(len);
764 memcpy(*blobp, buffer_ptr(&b), len);
766 memset(buffer_ptr(&b), 0, len);
774 u_char **sigp, u_int *lenp,
775 const u_char *data, u_int datalen)
779 return ssh_dss_sign(key, sigp, lenp, data, datalen);
782 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
785 error("key_sign: illegal key type %d", key->type);
792 * key_verify returns 1 for a correct signature, 0 for an incorrect signature
798 const u_char *signature, u_int signaturelen,
799 const u_char *data, u_int datalen)
801 if (signaturelen == 0)
806 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
809 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
812 error("key_verify: illegal key type %d", key->type);
818 /* Converts a private to a public key */
820 key_demote(const Key *k)
824 pk = xmalloc(sizeof(*pk));
826 pk->flags = k->flags;
833 if ((pk->rsa = RSA_new()) == NULL)
834 fatal("key_demote: RSA_new failed");
835 if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
836 fatal("key_demote: BN_dup failed");
837 if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
838 fatal("key_demote: BN_dup failed");
841 if ((pk->dsa = DSA_new()) == NULL)
842 fatal("key_demote: DSA_new failed");
843 if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
844 fatal("key_demote: BN_dup failed");
845 if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
846 fatal("key_demote: BN_dup failed");
847 if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
848 fatal("key_demote: BN_dup failed");
849 if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
850 fatal("key_demote: BN_dup failed");
853 fatal("key_free: bad key type %d", k->type);