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 1.16 2001/01/22 16:55:21 stevesk 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 * Generate key fingerprint in ascii format.
158 * Based on ideas and code from Bjoern Groenvall <bg@sics.se>
161 key_fingerprint(Key *k)
163 static char retval[(EVP_MAX_MD_SIZE+1)*3];
171 nlen = BN_num_bytes(k->rsa->n);
172 elen = BN_num_bytes(k->rsa->e);
175 BN_bn2bin(k->rsa->n, blob);
176 BN_bn2bin(k->rsa->e, blob + nlen);
180 key_to_blob(k, &blob, &len);
186 fatal("key_fingerprint: bad key type %d", k->type);
191 u_char digest[EVP_MAX_MD_SIZE];
192 EVP_MD *md = EVP_md5();
194 EVP_DigestInit(&ctx, md);
195 EVP_DigestUpdate(&ctx, blob, len);
196 EVP_DigestFinal(&ctx, digest, NULL);
197 for(i = 0; i < md->md_size; i++) {
199 snprintf(hex, sizeof(hex), "%02x:", digest[i]);
200 strlcat(retval, hex, sizeof(retval));
202 retval[strlen(retval) - 1] = '\0';
203 memset(blob, 0, len);
210 * Reads a multiple-precision integer in decimal from the buffer, and advances
211 * the pointer. The integer must already be initialized. This function is
212 * permitted to modify the buffer. This leaves *cpp to point just beyond the
213 * last processed (and maybe modified) character. Note that this may modify
214 * the buffer containing the number.
217 read_bignum(char **cpp, BIGNUM * value)
222 /* Skip any leading whitespace. */
223 for (; *cp == ' ' || *cp == '\t'; cp++)
226 /* Check that it begins with a decimal digit. */
227 if (*cp < '0' || *cp > '9')
230 /* Save starting position. */
233 /* Move forward until all decimal digits skipped. */
234 for (; *cp >= '0' && *cp <= '9'; cp++)
237 /* Save the old terminating character, and replace it by \0. */
241 /* Parse the number. */
242 if (BN_dec2bn(&value, *cpp) == 0)
245 /* Restore old terminating character. */
248 /* Move beyond the number and return success. */
253 write_bignum(FILE *f, BIGNUM *num)
255 char *buf = BN_bn2dec(num);
257 error("write_bignum: BN_bn2dec() failed");
260 fprintf(f, " %s", buf);
265 /* returns 1 ok, -1 error, 0 type mismatch */
267 key_read(Key *ret, char **cpp)
280 /* Get number of bits. */
281 if (*cp < '0' || *cp > '9')
282 return -1; /* Bad bit count... */
283 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
284 bits = 10 * bits + *cp - '0';
288 /* Get public exponent, public modulus. */
289 if (!read_bignum(cpp, ret->rsa->e))
291 if (!read_bignum(cpp, ret->rsa->n))
298 space = strchr(cp, ' ');
300 debug3("key_read: no space");
304 type = key_type_from_name(cp);
306 if (type == KEY_UNSPEC) {
307 debug3("key_read: no key found");
312 debug3("key_read: short string");
315 if (ret->type == KEY_UNSPEC) {
317 } else if (ret->type != type) {
318 /* is a key, but different type */
319 debug3("key_read: type mismatch");
324 n = uudecode(cp, blob, len);
326 error("key_read: uudecode %s failed", cp);
329 k = key_from_blob(blob, n);
331 error("key_read: key_from_blob %s failed", cp);
335 if (k->type != type) {
336 error("key_read: type mismatch: encoding error");
341 if (ret->type == KEY_RSA) {
342 if (ret->rsa != NULL)
348 RSA_print_fp(stderr, ret->rsa, 8);
351 if (ret->dsa != NULL)
357 DSA_print_fp(stderr, ret->dsa, 8);
364 /* advance cp: skip whitespace and data */
365 while (*cp == ' ' || *cp == '\t')
367 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
372 fatal("key_read: bad key type: %d", ret->type);
378 key_write(Key *key, FILE *f)
383 if (key->type == KEY_RSA1 && key->rsa != NULL) {
384 /* size of modulus 'n' */
385 bits = BN_num_bits(key->rsa->n);
386 fprintf(f, "%u", bits);
387 if (write_bignum(f, key->rsa->e) &&
388 write_bignum(f, key->rsa->n)) {
391 error("key_write: failed for RSA key");
393 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
394 (key->type == KEY_RSA && key->rsa != NULL)) {
397 key_to_blob(key, &blob, &len);
399 n = uuencode(blob, len, uu, 2*len);
401 fprintf(f, "%s %s", key_ssh_name(key), uu);
436 return "ssh-unknown";
443 return BN_num_bits(k->rsa->n);
446 return BN_num_bits(k->dsa->p);
453 rsa_generate_private_key(u_int bits)
456 private = RSA_generate_key(bits, 35, NULL, NULL);
458 fatal("rsa_generate_private_key: key generation failed.");
463 dsa_generate_private_key(u_int bits)
465 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
467 fatal("dsa_generate_private_key: DSA_generate_parameters failed");
468 if (!DSA_generate_key(private))
469 fatal("dsa_generate_private_key: DSA_generate_key failed.");
471 fatal("dsa_generate_private_key: NULL.");
476 key_generate(int type, u_int bits)
478 Key *k = key_new(KEY_UNSPEC);
481 k->dsa = dsa_generate_private_key(bits);
485 k->rsa = rsa_generate_private_key(bits);
488 fatal("key_generate: unknown type %d", type);
495 key_from_private(Key *k)
500 n = key_new(k->type);
501 BN_copy(n->dsa->p, k->dsa->p);
502 BN_copy(n->dsa->q, k->dsa->q);
503 BN_copy(n->dsa->g, k->dsa->g);
504 BN_copy(n->dsa->pub_key, k->dsa->pub_key);
508 n = key_new(k->type);
509 BN_copy(n->rsa->n, k->rsa->n);
510 BN_copy(n->rsa->e, k->rsa->e);
513 fatal("key_from_private: unknown type %d", k->type);
520 key_type_from_name(char *name)
522 if (strcmp(name, "rsa1") == 0){
524 } else if (strcmp(name, "rsa") == 0){
526 } else if (strcmp(name, "dsa") == 0){
528 } else if (strcmp(name, "ssh-rsa") == 0){
530 } else if (strcmp(name, "ssh-dss") == 0){
533 debug("key_type_from_name: unknown key type '%s'", name);
538 key_from_blob(char *blob, int blen)
546 dump_base64(stderr, blob, blen);
549 buffer_append(&b, blob, blen);
550 ktype = buffer_get_string(&b, NULL);
551 type = key_type_from_name(ktype);
556 buffer_get_bignum2(&b, key->rsa->e);
557 buffer_get_bignum2(&b, key->rsa->n);
559 RSA_print_fp(stderr, key->rsa, 8);
564 buffer_get_bignum2(&b, key->dsa->p);
565 buffer_get_bignum2(&b, key->dsa->q);
566 buffer_get_bignum2(&b, key->dsa->g);
567 buffer_get_bignum2(&b, key->dsa->pub_key);
569 DSA_print_fp(stderr, key->dsa, 8);
576 error("key_from_blob: cannot handle type %s", ktype);
579 rlen = buffer_len(&b);
580 if (key != NULL && rlen != 0)
581 error("key_from_blob: remaining bytes in key blob %d", rlen);
588 key_to_blob(Key *key, u_char **blobp, u_int *lenp)
595 error("key_to_blob: key == NULL");
601 buffer_put_cstring(&b, key_ssh_name(key));
602 buffer_put_bignum2(&b, key->dsa->p);
603 buffer_put_bignum2(&b, key->dsa->q);
604 buffer_put_bignum2(&b, key->dsa->g);
605 buffer_put_bignum2(&b, key->dsa->pub_key);
608 buffer_put_cstring(&b, key_ssh_name(key));
609 buffer_put_bignum2(&b, key->rsa->e);
610 buffer_put_bignum2(&b, key->rsa->n);
613 error("key_to_blob: illegal key type %d", key->type);
616 len = buffer_len(&b);
618 memcpy(buf, buffer_ptr(&b), len);
619 memset(buffer_ptr(&b), 0, len);
631 u_char **sigp, int *lenp,
632 u_char *data, int datalen)
636 return ssh_dss_sign(key, sigp, lenp, data, datalen);
639 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
642 error("key_sign: illegal key type %d", key->type);
651 u_char *signature, int signaturelen,
652 u_char *data, int datalen)
656 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
659 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
662 error("key_verify: illegal key type %d", key->type);