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 1.19 2001/03/11 15:03:15 jakob 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)
160 u_char *retval = NULL;
164 *dgst_raw_length = 0;
168 nlen = BN_num_bytes(k->rsa->n);
169 elen = BN_num_bytes(k->rsa->e);
172 BN_bn2bin(k->rsa->n, blob);
173 BN_bn2bin(k->rsa->e, blob + nlen);
177 key_to_blob(k, &blob, &len);
183 fatal("key_fingerprint_raw: bad key type %d", k->type);
190 retval = xmalloc(EVP_MAX_MD_SIZE);
200 fatal("key_fingerprint_raw: bad digest type %d",
204 EVP_DigestInit(&ctx, md);
205 EVP_DigestUpdate(&ctx, blob, len);
206 EVP_DigestFinal(&ctx, retval, NULL);
207 *dgst_raw_length = md->md_size;
208 memset(blob, 0, len);
211 fatal("key_fingerprint_raw: blob is null");
217 key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
222 retval = xmalloc(dgst_raw_len * 3);
224 for(i = 0; i < dgst_raw_len; i++) {
226 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
227 strlcat(retval, hex, dgst_raw_len * 3);
229 retval[(dgst_raw_len * 3) - 1] = '\0';
234 key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
236 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
237 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
238 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
239 u_int rounds, idx, retval_idx, seed;
242 rounds = (dgst_raw_len / 2) + 1;
243 retval = xmalloc(sizeof(char) * (rounds*6));
246 retval[retval_idx++] = 'x';
247 for (idx=0;idx<rounds;idx++) {
248 u_int idx0, idx1, idx2, idx3, idx4;
249 if ((idx + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
250 idx0 = (((((u_int)(dgst_raw[2 * idx])) >> 6) & 3) +
252 idx1 = (((u_int)(dgst_raw[2 * idx])) >> 2) & 15;
253 idx2 = ((((u_int)(dgst_raw[2 * idx])) & 3) +
255 retval[retval_idx++] = vowels[idx0];
256 retval[retval_idx++] = consonants[idx1];
257 retval[retval_idx++] = vowels[idx2];
258 if ((idx + 1) < rounds) {
259 idx3 = (((u_int)(dgst_raw[(2 * idx) + 1])) >> 4) & 15;
260 idx4 = (((u_int)(dgst_raw[(2 * idx) + 1]))) & 15;
261 retval[retval_idx++] = consonants[idx3];
262 retval[retval_idx++] = '-';
263 retval[retval_idx++] = consonants[idx4];
265 ((((u_int)(dgst_raw[2 * idx])) * 7) +
266 ((u_int)(dgst_raw[(2 * idx) + 1])))) % 36;
272 retval[retval_idx++] = vowels[idx0];
273 retval[retval_idx++] = consonants[idx1];
274 retval[retval_idx++] = vowels[idx2];
277 retval[retval_idx++] = 'x';
278 retval[retval_idx++] = '\0';
283 key_fingerprint_ex(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
289 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
291 fatal("key_fingerprint_ex: null value returned from key_fingerprint_raw()");
294 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
296 case SSH_FP_BUBBLEBABBLE:
297 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
300 fatal("key_fingerprint_ex: bad digest representation %d",
304 memset(dgst_raw, 0, dgst_raw_len);
310 key_fingerprint(Key *k)
312 static char retval[(EVP_MAX_MD_SIZE + 1) * 3];
315 digest = key_fingerprint_ex(k, SSH_FP_MD5, SSH_FP_HEX);
316 strlcpy(retval, digest, sizeof(retval));
322 * Reads a multiple-precision integer in decimal from the buffer, and advances
323 * the pointer. The integer must already be initialized. This function is
324 * permitted to modify the buffer. This leaves *cpp to point just beyond the
325 * last processed (and maybe modified) character. Note that this may modify
326 * the buffer containing the number.
329 read_bignum(char **cpp, BIGNUM * value)
334 /* Skip any leading whitespace. */
335 for (; *cp == ' ' || *cp == '\t'; cp++)
338 /* Check that it begins with a decimal digit. */
339 if (*cp < '0' || *cp > '9')
342 /* Save starting position. */
345 /* Move forward until all decimal digits skipped. */
346 for (; *cp >= '0' && *cp <= '9'; cp++)
349 /* Save the old terminating character, and replace it by \0. */
353 /* Parse the number. */
354 if (BN_dec2bn(&value, *cpp) == 0)
357 /* Restore old terminating character. */
360 /* Move beyond the number and return success. */
365 write_bignum(FILE *f, BIGNUM *num)
367 char *buf = BN_bn2dec(num);
369 error("write_bignum: BN_bn2dec() failed");
372 fprintf(f, " %s", buf);
377 /* returns 1 ok, -1 error, 0 type mismatch */
379 key_read(Key *ret, char **cpp)
392 /* Get number of bits. */
393 if (*cp < '0' || *cp > '9')
394 return -1; /* Bad bit count... */
395 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
396 bits = 10 * bits + *cp - '0';
400 /* Get public exponent, public modulus. */
401 if (!read_bignum(cpp, ret->rsa->e))
403 if (!read_bignum(cpp, ret->rsa->n))
410 space = strchr(cp, ' ');
412 debug3("key_read: no space");
416 type = key_type_from_name(cp);
418 if (type == KEY_UNSPEC) {
419 debug3("key_read: no key found");
424 debug3("key_read: short string");
427 if (ret->type == KEY_UNSPEC) {
429 } else if (ret->type != type) {
430 /* is a key, but different type */
431 debug3("key_read: type mismatch");
436 n = uudecode(cp, blob, len);
438 error("key_read: uudecode %s failed", cp);
441 k = key_from_blob(blob, n);
443 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);
490 key_write(Key *key, FILE *f)
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)) {
503 error("key_write: failed for RSA key");
505 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
506 (key->type == KEY_RSA && key->rsa != NULL)) {
509 key_to_blob(key, &blob, &len);
511 n = uuencode(blob, len, uu, 2*len);
513 fprintf(f, "%s %s", key_ssh_name(key), uu);
548 return "ssh-unknown";
555 return BN_num_bits(k->rsa->n);
558 return BN_num_bits(k->dsa->p);
565 rsa_generate_private_key(u_int bits)
568 private = RSA_generate_key(bits, 35, NULL, NULL);
570 fatal("rsa_generate_private_key: key generation failed.");
575 dsa_generate_private_key(u_int bits)
577 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(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_from_blob(char *blob, int blen)
658 dump_base64(stderr, blob, blen);
661 buffer_append(&b, blob, blen);
662 ktype = buffer_get_string(&b, NULL);
663 type = key_type_from_name(ktype);
668 buffer_get_bignum2(&b, key->rsa->e);
669 buffer_get_bignum2(&b, key->rsa->n);
671 RSA_print_fp(stderr, key->rsa, 8);
676 buffer_get_bignum2(&b, key->dsa->p);
677 buffer_get_bignum2(&b, key->dsa->q);
678 buffer_get_bignum2(&b, key->dsa->g);
679 buffer_get_bignum2(&b, key->dsa->pub_key);
681 DSA_print_fp(stderr, key->dsa, 8);
688 error("key_from_blob: cannot handle type %s", ktype);
691 rlen = buffer_len(&b);
692 if (key != NULL && rlen != 0)
693 error("key_from_blob: remaining bytes in key blob %d", rlen);
700 key_to_blob(Key *key, u_char **blobp, u_int *lenp)
707 error("key_to_blob: key == NULL");
713 buffer_put_cstring(&b, key_ssh_name(key));
714 buffer_put_bignum2(&b, key->dsa->p);
715 buffer_put_bignum2(&b, key->dsa->q);
716 buffer_put_bignum2(&b, key->dsa->g);
717 buffer_put_bignum2(&b, key->dsa->pub_key);
720 buffer_put_cstring(&b, key_ssh_name(key));
721 buffer_put_bignum2(&b, key->rsa->e);
722 buffer_put_bignum2(&b, key->rsa->n);
725 error("key_to_blob: illegal key type %d", key->type);
728 len = buffer_len(&b);
730 memcpy(buf, buffer_ptr(&b), len);
731 memset(buffer_ptr(&b), 0, len);
743 u_char **sigp, int *lenp,
744 u_char *data, int datalen)
748 return ssh_dss_sign(key, sigp, lenp, data, datalen);
751 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
754 error("key_sign: illegal key type %d", key->type);
763 u_char *signature, int signaturelen,
764 u_char *data, int datalen)
768 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
771 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
774 error("key_verify: illegal key type %d", key->type);