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 1.33 2001/10/04 14:34:16 markus Exp $");
37 #include <openssl/evp.h>
55 k = xmalloc(sizeof(*k));
73 dsa->pub_key = BN_new();
79 fatal("key_new: bad key type %d", k->type);
85 key_new_private(int type)
87 Key *k = key_new(type);
92 k->rsa->iqmp = BN_new();
95 k->rsa->dmq1 = BN_new();
96 k->rsa->dmp1 = BN_new();
99 k->dsa->priv_key = BN_new();
126 fatal("key_free: bad key type %d", k->type);
132 key_equal(Key *a, Key *b)
134 if (a == NULL || b == NULL || a->type != b->type)
139 return a->rsa != NULL && b->rsa != NULL &&
140 BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
141 BN_cmp(a->rsa->n, b->rsa->n) == 0;
144 return a->dsa != NULL && b->dsa != NULL &&
145 BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
146 BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
147 BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
148 BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
151 fatal("key_equal: bad key type %d", a->type);
158 key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length)
163 u_char *retval = NULL;
167 *dgst_raw_length = 0;
177 fatal("key_fingerprint_raw: bad digest type %d",
182 nlen = BN_num_bytes(k->rsa->n);
183 elen = BN_num_bytes(k->rsa->e);
186 BN_bn2bin(k->rsa->n, blob);
187 BN_bn2bin(k->rsa->e, blob + nlen);
191 key_to_blob(k, &blob, &len);
197 fatal("key_fingerprint_raw: bad key type %d", k->type);
201 retval = xmalloc(EVP_MAX_MD_SIZE);
202 EVP_DigestInit(&ctx, md);
203 EVP_DigestUpdate(&ctx, blob, len);
204 EVP_DigestFinal(&ctx, retval, NULL);
205 *dgst_raw_length = md->md_size;
206 memset(blob, 0, len);
209 fatal("key_fingerprint_raw: blob is null");
215 key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
220 retval = xmalloc(dgst_raw_len * 3 + 1);
222 for(i = 0; i < dgst_raw_len; i++) {
224 snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
225 strlcat(retval, hex, dgst_raw_len * 3);
227 retval[(dgst_raw_len * 3) - 1] = '\0';
232 key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
234 char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
235 char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
236 'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
237 u_int i, j = 0, rounds, seed = 1;
240 rounds = (dgst_raw_len / 2) + 1;
241 retval = xmalloc(sizeof(char) * (rounds*6));
243 for (i = 0; i < rounds; i++) {
244 u_int idx0, idx1, idx2, idx3, idx4;
245 if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
246 idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
248 idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
249 idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
251 retval[j++] = vowels[idx0];
252 retval[j++] = consonants[idx1];
253 retval[j++] = vowels[idx2];
254 if ((i + 1) < rounds) {
255 idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
256 idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
257 retval[j++] = consonants[idx3];
259 retval[j++] = consonants[idx4];
261 ((((u_int)(dgst_raw[2 * i])) * 7) +
262 ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
268 retval[j++] = vowels[idx0];
269 retval[j++] = consonants[idx1];
270 retval[j++] = vowels[idx2];
279 key_fingerprint(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
285 dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
287 fatal("key_fingerprint: null from key_fingerprint_raw()");
290 retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
292 case SSH_FP_BUBBLEBABBLE:
293 retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
296 fatal("key_fingerprint_ex: bad digest representation %d",
300 memset(dgst_raw, 0, dgst_raw_len);
306 * Reads a multiple-precision integer in decimal from the buffer, and advances
307 * the pointer. The integer must already be initialized. This function is
308 * permitted to modify the buffer. This leaves *cpp to point just beyond the
309 * last processed (and maybe modified) character. Note that this may modify
310 * the buffer containing the number.
313 read_bignum(char **cpp, BIGNUM * value)
318 /* Skip any leading whitespace. */
319 for (; *cp == ' ' || *cp == '\t'; cp++)
322 /* Check that it begins with a decimal digit. */
323 if (*cp < '0' || *cp > '9')
326 /* Save starting position. */
329 /* Move forward until all decimal digits skipped. */
330 for (; *cp >= '0' && *cp <= '9'; cp++)
333 /* Save the old terminating character, and replace it by \0. */
337 /* Parse the number. */
338 if (BN_dec2bn(&value, *cpp) == 0)
341 /* Restore old terminating character. */
344 /* Move beyond the number and return success. */
349 write_bignum(FILE *f, BIGNUM *num)
351 char *buf = BN_bn2dec(num);
353 error("write_bignum: BN_bn2dec() failed");
356 fprintf(f, " %s", buf);
361 /* returns 1 ok, -1 error */
363 key_read(Key *ret, char **cpp)
376 /* Get number of bits. */
377 if (*cp < '0' || *cp > '9')
378 return -1; /* Bad bit count... */
379 for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
380 bits = 10 * bits + *cp - '0';
384 /* Get public exponent, public modulus. */
385 if (!read_bignum(cpp, ret->rsa->e))
387 if (!read_bignum(cpp, ret->rsa->n))
394 space = strchr(cp, ' ');
396 debug3("key_read: no space");
400 type = key_type_from_name(cp);
402 if (type == KEY_UNSPEC) {
403 debug3("key_read: no key found");
408 debug3("key_read: short string");
411 if (ret->type == KEY_UNSPEC) {
413 } else if (ret->type != type) {
414 /* is a key, but different type */
415 debug3("key_read: type mismatch");
420 n = uudecode(cp, blob, len);
422 error("key_read: uudecode %s failed", cp);
425 k = key_from_blob(blob, n);
427 error("key_read: key_from_blob %s failed", cp);
431 if (k->type != type) {
432 error("key_read: type mismatch: encoding error");
437 if (ret->type == KEY_RSA) {
438 if (ret->rsa != NULL)
444 RSA_print_fp(stderr, ret->rsa, 8);
447 if (ret->dsa != NULL)
453 DSA_print_fp(stderr, ret->dsa, 8);
460 /* advance cp: skip whitespace and data */
461 while (*cp == ' ' || *cp == '\t')
463 while (*cp != '\0' && *cp != ' ' && *cp != '\t')
468 fatal("key_read: bad key type: %d", ret->type);
474 key_write(Key *key, FILE *f)
479 if (key->type == KEY_RSA1 && key->rsa != NULL) {
480 /* size of modulus 'n' */
481 bits = BN_num_bits(key->rsa->n);
482 fprintf(f, "%u", bits);
483 if (write_bignum(f, key->rsa->e) &&
484 write_bignum(f, key->rsa->n)) {
487 error("key_write: failed for RSA key");
489 } else if ((key->type == KEY_DSA && key->dsa != NULL) ||
490 (key->type == KEY_RSA && key->rsa != NULL)) {
493 key_to_blob(key, &blob, &len);
495 n = uuencode(blob, len, uu, 2*len);
497 fprintf(f, "%s %s", key_ssh_name(key), uu);
532 return "ssh-unknown";
539 return BN_num_bits(k->rsa->n);
542 return BN_num_bits(k->dsa->p);
549 rsa_generate_private_key(u_int bits)
552 private = RSA_generate_key(bits, 35, NULL, NULL);
554 fatal("rsa_generate_private_key: key generation failed.");
559 dsa_generate_private_key(u_int bits)
561 DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
563 fatal("dsa_generate_private_key: DSA_generate_parameters failed");
564 if (!DSA_generate_key(private))
565 fatal("dsa_generate_private_key: DSA_generate_key failed.");
567 fatal("dsa_generate_private_key: NULL.");
572 key_generate(int type, u_int bits)
574 Key *k = key_new(KEY_UNSPEC);
577 k->dsa = dsa_generate_private_key(bits);
581 k->rsa = rsa_generate_private_key(bits);
584 fatal("key_generate: unknown type %d", type);
591 key_from_private(Key *k)
596 n = key_new(k->type);
597 BN_copy(n->dsa->p, k->dsa->p);
598 BN_copy(n->dsa->q, k->dsa->q);
599 BN_copy(n->dsa->g, k->dsa->g);
600 BN_copy(n->dsa->pub_key, k->dsa->pub_key);
604 n = key_new(k->type);
605 BN_copy(n->rsa->n, k->rsa->n);
606 BN_copy(n->rsa->e, k->rsa->e);
609 fatal("key_from_private: unknown type %d", k->type);
616 key_type_from_name(char *name)
618 if (strcmp(name, "rsa1") == 0){
620 } else if (strcmp(name, "rsa") == 0){
622 } else if (strcmp(name, "dsa") == 0){
624 } else if (strcmp(name, "ssh-rsa") == 0){
626 } else if (strcmp(name, "ssh-dss") == 0){
629 debug2("key_type_from_name: unknown key type '%s'", name);
634 key_names_valid2(const char *names)
638 if (names == NULL || strcmp(names, "") == 0)
640 s = cp = xstrdup(names);
641 for ((p = strsep(&cp, ",")); p && *p != '\0';
642 (p = strsep(&cp, ","))) {
643 switch (key_type_from_name(p)) {
650 debug3("key names ok: [%s]", names);
656 key_from_blob(u_char *blob, int blen)
664 dump_base64(stderr, blob, blen);
667 buffer_append(&b, blob, blen);
668 ktype = buffer_get_string(&b, NULL);
669 type = key_type_from_name(ktype);
674 buffer_get_bignum2(&b, key->rsa->e);
675 buffer_get_bignum2(&b, key->rsa->n);
677 RSA_print_fp(stderr, key->rsa, 8);
682 buffer_get_bignum2(&b, key->dsa->p);
683 buffer_get_bignum2(&b, key->dsa->q);
684 buffer_get_bignum2(&b, key->dsa->g);
685 buffer_get_bignum2(&b, key->dsa->pub_key);
687 DSA_print_fp(stderr, key->dsa, 8);
694 error("key_from_blob: cannot handle type %s", ktype);
697 rlen = buffer_len(&b);
698 if (key != NULL && rlen != 0)
699 error("key_from_blob: remaining bytes in key blob %d", rlen);
706 key_to_blob(Key *key, u_char **blobp, u_int *lenp)
713 error("key_to_blob: key == NULL");
719 buffer_put_cstring(&b, key_ssh_name(key));
720 buffer_put_bignum2(&b, key->dsa->p);
721 buffer_put_bignum2(&b, key->dsa->q);
722 buffer_put_bignum2(&b, key->dsa->g);
723 buffer_put_bignum2(&b, key->dsa->pub_key);
726 buffer_put_cstring(&b, key_ssh_name(key));
727 buffer_put_bignum2(&b, key->rsa->e);
728 buffer_put_bignum2(&b, key->rsa->n);
731 error("key_to_blob: unsupported key type %d", key->type);
735 len = buffer_len(&b);
737 memcpy(buf, buffer_ptr(&b), len);
738 memset(buffer_ptr(&b), 0, len);
750 u_char **sigp, int *lenp,
751 u_char *data, int datalen)
755 return ssh_dss_sign(key, sigp, lenp, data, datalen);
758 return ssh_rsa_sign(key, sigp, lenp, data, datalen);
761 error("key_sign: illegal key type %d", key->type);
770 u_char *signature, int signaturelen,
771 u_char *data, int datalen)
773 if (signaturelen == 0)
778 return ssh_dss_verify(key, signature, signaturelen, data, datalen);
781 return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
784 error("key_verify: illegal key type %d", key->type);