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.
36 #include <openssl/evp.h>
52 k = xcalloc(1, sizeof(*k));
59 if ((rsa = RSA_new()) == NULL)
60 fatal("key_new: RSA_new failed");
61 if ((rsa->n = BN_new()) == NULL)
62 fatal("key_new: BN_new failed");
63 if ((rsa->e = BN_new()) == NULL)
64 fatal("key_new: BN_new failed");
68 if ((dsa = DSA_new()) == NULL)
69 fatal("key_new: DSA_new failed");
70 if ((dsa->p = BN_new()) == NULL)
71 fatal("key_new: BN_new failed");
72 if ((dsa->q = BN_new()) == NULL)
73 fatal("key_new: BN_new failed");
74 if ((dsa->g = BN_new()) == NULL)
75 fatal("key_new: BN_new failed");
76 if ((dsa->pub_key = BN_new()) == NULL)
77 fatal("key_new: BN_new failed");
83 fatal("key_new: bad key type %d", k->type);
90 key_new_private(int type)
92 Key *k = key_new(type);
96 if ((k->rsa->d = BN_new()) == NULL)
97 fatal("key_new_private: BN_new failed");
98 if ((k->rsa->iqmp = BN_new()) == NULL)
99 fatal("key_new_private: BN_new failed");
100 if ((k->rsa->q = BN_new()) == NULL)
101 fatal("key_new_private: BN_new failed");
102 if ((k->rsa->p = BN_new()) == NULL)
103 fatal("key_new_private: BN_new failed");
104 if ((k->rsa->dmq1 = BN_new()) == NULL)
105 fatal("key_new_private: BN_new failed");
106 if ((k->rsa->dmp1 = BN_new()) == NULL)
107 fatal("key_new_private: BN_new failed");
110 if ((k->dsa->priv_key = BN_new()) == NULL)
111 fatal("key_new_private: BN_new failed");
125 fatal("key_free: key is NULL");
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;
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;
165 fatal("key_equal: bad key type %d", a->type);
172 key_fingerprint_raw(const Key *k, enum fp_type dgst_type,
173 u_int *dgst_raw_length)
175 const EVP_MD *md = NULL;
178 u_char *retval = NULL;
182 *dgst_raw_length = 0;
192 fatal("key_fingerprint_raw: bad digest type %d",
197 nlen = BN_num_bytes(k->rsa->n);
198 elen = BN_num_bytes(k->rsa->e);
201 BN_bn2bin(k->rsa->n, blob);
202 BN_bn2bin(k->rsa->e, blob + nlen);
206 key_to_blob(k, &blob, &len);
211 fatal("key_fingerprint_raw: bad key type %d", k->type);
215 retval = xmalloc(EVP_MAX_MD_SIZE);
216 EVP_DigestInit(&ctx, md);
217 EVP_DigestUpdate(&ctx, blob, len);
218 EVP_DigestFinal(&ctx, retval, dgst_raw_length);
219 memset(blob, 0, len);
222 fatal("key_fingerprint_raw: blob is null");
228 key_fingerprint_hex(u_char *dgst_raw, u_int dgst_raw_len)
233 retval = xcalloc(1, dgst_raw_len * 3 + 1);
234 for (i = 0; i < dgst_raw_len; i++) {
236 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
237 strlcat(retval, hex, dgst_raw_len * 3 + 1);
240 /* Remove the trailing ':' character */
241 retval[(dgst_raw_len * 3) - 1] = '\0';
246 key_fingerprint_bubblebabble(u_char *dgst_raw, u_int dgst_raw_len)
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;
254 rounds = (dgst_raw_len / 2) + 1;
255 retval = xcalloc((rounds * 6), sizeof(char));
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) +
262 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
263 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
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];
273 retval[j++] = consonants[idx4];
275 ((((u_int)(dgst_raw[2 * i])) * 7) +
276 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
282 retval[j++] = vowels[idx0];
283 retval[j++] = consonants[idx1];
284 retval[j++] = vowels[idx2];
293 key_fingerprint(const Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
299 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
301 fatal("key_fingerprint: null from key_fingerprint_raw()");
304 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
306 case SSH_FP_BUBBLEBABBLE:
307 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
310 fatal("key_fingerprint_ex: bad digest representation %d",
314 memset(dgst_raw, 0, dgst_raw_len);
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.
327 read_bignum(char **cpp, BIGNUM * value)
332 /* Skip any leading whitespace. */
333 for (; *cp == ' ' || *cp == '\t'; cp++)
336 /* Check that it begins with a decimal digit. */
337 if (*cp < '0' || *cp > '9')
340 /* Save starting position. */
343 /* Move forward until all decimal digits skipped. */
344 for (; *cp >= '0' && *cp <= '9'; cp++)
347 /* Save the old terminating character, and replace it by \0. */
351 /* Parse the number. */
352 if (BN_dec2bn(&value, *cpp) == 0)
355 /* Restore old terminating character. */
358 /* Move beyond the number and return success. */
364 write_bignum(FILE *f, BIGNUM *num)
366 char *buf = BN_bn2dec(num);
368 error("write_bignum: BN_bn2dec() failed");
371 fprintf(f, " %s", buf);
376 /* returns 1 ok, -1 error */
378 key_read(Key *ret, char **cpp)
391 /* Get number of bits. */
392 if (*cp < '0' || *cp > '9')
393 return -1; /* Bad bit count... */
394 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
395 bits = 10 * bits + *cp - '0';
399 /* Get public exponent, public modulus. */
400 if (!read_bignum(cpp, ret->rsa->e))
402 if (!read_bignum(cpp, ret->rsa->n))
409 space = strchr(cp, ' ');
411 debug3("key_read: missing whitespace");
415 type = key_type_from_name(cp);
417 if (type == KEY_UNSPEC) {
418 debug3("key_read: missing keytype");
423 debug3("key_read: short string");
426 if (ret->type == KEY_UNSPEC) {
428 } else if (ret->type != type) {
429 /* is a key, but different type */
430 debug3("key_read: type mismatch");
435 n = uudecode(cp, blob, len);
437 error("key_read: uudecode %s failed", cp);
441 k = key_from_blob(blob, (u_int)n);
444 error("key_read: key_from_blob %s failed", cp);
447 if (k->type != type) {
448 error("key_read: type mismatch: encoding error");
453 if (ret->type == KEY_RSA) {
454 if (ret->rsa != NULL)
460 RSA_print_fp(stderr, ret->rsa, 8);
463 if (ret->dsa != NULL)
469 DSA_print_fp(stderr, ret->dsa, 8);
476 /* advance cp: skip whitespace and data */
477 while (*cp == ' ' || *cp == '\t')
479 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
484 fatal("key_read: bad key type: %d", ret->type);
491 key_write(const Key *key, FILE *f)
498 if (key->type == KEY_RSA1 && key->rsa != NULL) {
499 /* size of modulus 'n' */
500 bits = BN_num_bits(key->rsa->n);
501 fprintf(f, "%u", bits);
502 if (write_bignum(f, key->rsa->e) &&
503 write_bignum(f, key->rsa->n)) {
506 error("key_write: failed for RSA key");
508 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
509 (key->type == KEY_RSA && key->rsa != NULL)) {
510 key_to_blob(key, &blob, &len);
512 n = uuencode(blob, len, uu, 2*len);
514 fprintf(f, "%s %s", key_ssh_name(key), uu);
524 key_type(const Key *k)
538 key_ssh_name(const Key *k)
546 return "ssh-unknown";
550 key_size(const Key *k)
555 return BN_num_bits(k->rsa->n);
557 return BN_num_bits(k->dsa->p);
563 rsa_generate_private_key(u_int bits)
567 private = RSA_generate_key(bits, 35, NULL, NULL);
569 fatal("rsa_generate_private_key: key generation failed.");
574 dsa_generate_private_key(u_int bits)
576 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, 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.");
583 fatal("dsa_generate_private_key: NULL.");
588 key_generate(int type, u_int bits)
590 Key *k = key_new(KEY_UNSPEC);
593 k->dsa = dsa_generate_private_key(bits);
597 k->rsa = rsa_generate_private_key(bits);
600 fatal("key_generate: unknown type %d", type);
607 key_from_private(const Key *k)
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);
620 n = key_new(k->type);
621 BN_copy(n->rsa->n, k->rsa->n);
622 BN_copy(n->rsa->e, k->rsa->e);
625 fatal("key_from_private: unknown type %d", k->type);
632 key_type_from_name(char *name)
634 if (strcmp(name, "rsa1") == 0) {
636 } else if (strcmp(name, "rsa") == 0) {
638 } else if (strcmp(name, "dsa") == 0) {
640 } else if (strcmp(name, "ssh-rsa") == 0) {
642 } else if (strcmp(name, "ssh-dss") == 0) {
645 debug2("key_type_from_name: unknown key type '%s'", name);
650 key_names_valid2(const char *names)
654 if (names == NULL || strcmp(names, "") == 0)
656 s = cp = xstrdup(names);
657 for ((p = strsep(&cp, ",")); p && *p != '\0';
658 (p = strsep(&cp, ","))) {
659 switch (key_type_from_name(p)) {
666 debug3("key names ok: [%s]", names);
672 key_from_blob(const u_char *blob, u_int blen)
680 dump_base64(stderr, blob, blen);
683 buffer_append(&b, blob, blen);
684 if ((ktype = buffer_get_string_ret(&b, NULL)) == NULL) {
685 error("key_from_blob: can't read key type");
689 type = key_type_from_name(ktype);
694 if (buffer_get_bignum2_ret(&b, key->rsa->e) == -1 ||
695 buffer_get_bignum2_ret(&b, key->rsa->n) == -1) {
696 error("key_from_blob: can't read rsa key");
702 RSA_print_fp(stderr, key->rsa, 8);
707 if (buffer_get_bignum2_ret(&b, key->dsa->p) == -1 ||
708 buffer_get_bignum2_ret(&b, key->dsa->q) == -1 ||
709 buffer_get_bignum2_ret(&b, key->dsa->g) == -1 ||
710 buffer_get_bignum2_ret(&b, key->dsa->pub_key) == -1) {
711 error("key_from_blob: can't read dsa key");
717 DSA_print_fp(stderr, key->dsa, 8);
724 error("key_from_blob: cannot handle type %s", ktype);
727 rlen = buffer_len(&b);
728 if (key != NULL && rlen != 0)
729 error("key_from_blob: remaining bytes in key blob %d", rlen);
738 key_to_blob(const Key *key, u_char **blobp, u_int *lenp)
744 error("key_to_blob: key == NULL");
750 buffer_put_cstring(&b, key_ssh_name(key));
751 buffer_put_bignum2(&b, key->dsa->p);
752 buffer_put_bignum2(&b, key->dsa->q);
753 buffer_put_bignum2(&b, key->dsa->g);
754 buffer_put_bignum2(&b, key->dsa->pub_key);
757 buffer_put_cstring(&b, key_ssh_name(key));
758 buffer_put_bignum2(&b, key->rsa->e);
759 buffer_put_bignum2(&b, key->rsa->n);
762 error("key_to_blob: unsupported key type %d", key->type);
766 len = buffer_len(&b);
770 *blobp = xmalloc(len);
771 memcpy(*blobp, buffer_ptr(&b), len);
773 memset(buffer_ptr(&b), 0, len);
781 u_char **sigp, u_int *lenp,
782 const u_char *data, u_int datalen)
786 return ssh_dss_sign(key, sigp, lenp, data, datalen);
788 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
790 error("key_sign: invalid key type %d", key->type);
796 * key_verify returns 1 for a correct signature, 0 for an incorrect signature
802 const u_char *signature, u_int signaturelen,
803 const u_char *data, u_int datalen)
805 if (signaturelen == 0)
810 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
812 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
814 error("key_verify: invalid key type %d", key->type);
819 /* Converts a private to a public key */
821 key_demote(const Key *k)
825 pk = xcalloc(1, sizeof(*pk));
827 pk->flags = k->flags;
834 if ((pk->rsa = RSA_new()) == NULL)
835 fatal("key_demote: RSA_new failed");
836 if ((pk->rsa->e = BN_dup(k->rsa->e)) == NULL)
837 fatal("key_demote: BN_dup failed");
838 if ((pk->rsa->n = BN_dup(k->rsa->n)) == NULL)
839 fatal("key_demote: BN_dup failed");
842 if ((pk->dsa = DSA_new()) == NULL)
843 fatal("key_demote: DSA_new failed");
844 if ((pk->dsa->p = BN_dup(k->dsa->p)) == NULL)
845 fatal("key_demote: BN_dup failed");
846 if ((pk->dsa->q = BN_dup(k->dsa->q)) == NULL)
847 fatal("key_demote: BN_dup failed");
848 if ((pk->dsa->g = BN_dup(k->dsa->g)) == NULL)
849 fatal("key_demote: BN_dup failed");
850 if ((pk->dsa->pub_key = BN_dup(k->dsa->pub_key)) == NULL)
851 fatal("key_demote: BN_dup failed");
854 fatal("key_free: bad key type %d", k->type);