2 * Portions Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
3 * Portions Copyright (C) 1999-2002 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
12 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
15 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * Portions Copyright (C) 1995-2000 by Network Associates, Inc.
19 * Permission to use, copy, modify, and/or distribute this software for any
20 * purpose with or without fee is hereby granted, provided that the above
21 * copyright notice and this permission notice appear in all copies.
23 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
24 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
25 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE
26 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
27 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
28 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
29 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
33 * Principal Author: Brian Wellington
34 * $Id: openssldh_link.c,v 1.14 2008/04/01 23:47:10 tbox Exp $
44 #include <isc/string.h>
47 #include <dst/result.h>
49 #include "dst_internal.h"
50 #include "dst_openssl.h"
51 #include "dst_parse.h"
53 #define PRIME768 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088" \
54 "A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25" \
55 "F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A63A3620FFFFFFFFFFFFFFFF"
57 #define PRIME1024 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08" \
58 "8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF2" \
59 "5F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406" \
60 "B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF"
62 #define PRIME1536 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
63 "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
64 "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
65 "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
66 "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
67 "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
68 "83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
69 "670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF"
72 static isc_result_t openssldh_todns(const dst_key_t *key, isc_buffer_t *data);
74 static BIGNUM bn2, bn768, bn1024, bn1536;
77 openssldh_computesecret(const dst_key_t *pub, const dst_key_t *priv,
85 REQUIRE(pub->keydata.dh != NULL);
86 REQUIRE(priv->keydata.dh != NULL);
88 dhpub = pub->keydata.dh;
89 dhpriv = priv->keydata.dh;
91 len = DH_size(dhpriv);
92 isc_buffer_availableregion(secret, &r);
94 return (ISC_R_NOSPACE);
95 ret = DH_compute_key(r.base, dhpub->pub_key, dhpriv);
97 return (dst__openssl_toresult(DST_R_COMPUTESECRETFAILURE));
98 isc_buffer_add(secret, len);
99 return (ISC_R_SUCCESS);
103 openssldh_compare(const dst_key_t *key1, const dst_key_t *key2) {
107 dh1 = key1->keydata.dh;
108 dh2 = key2->keydata.dh;
110 if (dh1 == NULL && dh2 == NULL)
112 else if (dh1 == NULL || dh2 == NULL)
115 status = BN_cmp(dh1->p, dh2->p) ||
116 BN_cmp(dh1->g, dh2->g) ||
117 BN_cmp(dh1->pub_key, dh2->pub_key);
122 if (dh1->priv_key != NULL || dh2->priv_key != NULL) {
123 if (dh1->priv_key == NULL || dh2->priv_key == NULL)
125 if (BN_cmp(dh1->priv_key, dh2->priv_key) != 0)
132 openssldh_paramcompare(const dst_key_t *key1, const dst_key_t *key2) {
136 dh1 = key1->keydata.dh;
137 dh2 = key2->keydata.dh;
139 if (dh1 == NULL && dh2 == NULL)
141 else if (dh1 == NULL || dh2 == NULL)
144 status = BN_cmp(dh1->p, dh2->p) ||
145 BN_cmp(dh1->g, dh2->g);
153 openssldh_generate(dst_key_t *key, int generator) {
154 #if OPENSSL_VERSION_NUMBER > 0x00908000L
159 if (generator == 0) {
160 if (key->key_size == 768 ||
161 key->key_size == 1024 ||
162 key->key_size == 1536)
166 return (dst__openssl_toresult(ISC_R_NOMEMORY));
167 if (key->key_size == 768)
169 else if (key->key_size == 1024)
178 if (generator != 0) {
179 #if OPENSSL_VERSION_NUMBER > 0x00908000L
182 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
184 BN_GENCB_set_old(&cb, NULL, NULL);
186 if (!DH_generate_parameters_ex(dh, key->key_size, generator,
189 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
192 dh = DH_generate_parameters(key->key_size, generator,
198 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
200 if (DH_generate_key(dh) == 0) {
202 return (dst__openssl_toresult(DST_R_OPENSSLFAILURE));
204 dh->flags &= ~DH_FLAG_CACHE_MONT_P;
206 key->keydata.dh = dh;
208 return (ISC_R_SUCCESS);
212 openssldh_isprivate(const dst_key_t *key) {
213 DH *dh = key->keydata.dh;
214 return (ISC_TF(dh != NULL && dh->priv_key != NULL));
218 openssldh_destroy(dst_key_t *key) {
219 DH *dh = key->keydata.dh;
224 if (dh->p == &bn768 || dh->p == &bn1024 || dh->p == &bn1536)
229 key->keydata.dh = NULL;
233 uint16_toregion(isc_uint16_t val, isc_region_t *region) {
234 *region->base++ = (val & 0xff00) >> 8;
235 *region->base++ = (val & 0x00ff);
239 uint16_fromregion(isc_region_t *region) {
241 unsigned char *cp = region->base;
243 val = ((unsigned int)(cp[0])) << 8;
244 val |= ((unsigned int)(cp[1]));
251 openssldh_todns(const dst_key_t *key, isc_buffer_t *data) {
254 isc_uint16_t dnslen, plen, glen, publen;
256 REQUIRE(key->keydata.dh != NULL);
258 dh = key->keydata.dh;
260 isc_buffer_availableregion(data, &r);
263 (dh->p == &bn768 || dh->p == &bn1024 || dh->p == &bn1536)) {
268 plen = BN_num_bytes(dh->p);
269 glen = BN_num_bytes(dh->g);
271 publen = BN_num_bytes(dh->pub_key);
272 dnslen = plen + glen + publen + 6;
273 if (r.length < (unsigned int) dnslen)
274 return (ISC_R_NOSPACE);
276 uint16_toregion(plen, &r);
280 else if (dh->p == &bn1024)
286 BN_bn2bin(dh->p, r.base);
289 uint16_toregion(glen, &r);
291 BN_bn2bin(dh->g, r.base);
294 uint16_toregion(publen, &r);
295 BN_bn2bin(dh->pub_key, r.base);
298 isc_buffer_add(data, dnslen);
300 return (ISC_R_SUCCESS);
304 openssldh_fromdns(dst_key_t *key, isc_buffer_t *data) {
307 isc_uint16_t plen, glen, publen;
310 isc_buffer_remainingregion(data, &r);
312 return (ISC_R_SUCCESS);
316 return (dst__openssl_toresult(ISC_R_NOMEMORY));
317 dh->flags &= ~DH_FLAG_CACHE_MONT_P;
320 * Read the prime length. 1 & 2 are table entries, > 16 means a
321 * prime follows, otherwise an error.
325 return (DST_R_INVALIDPUBLICKEY);
327 plen = uint16_fromregion(&r);
328 if (plen < 16 && plen != 1 && plen != 2) {
330 return (DST_R_INVALIDPUBLICKEY);
332 if (r.length < plen) {
334 return (DST_R_INVALIDPUBLICKEY);
336 if (plen == 1 || plen == 2) {
340 special = uint16_fromregion(&r);
353 return (DST_R_INVALIDPUBLICKEY);
357 dh->p = BN_bin2bn(r.base, plen, NULL);
362 * Read the generator length. This should be 0 if the prime was
363 * special, but it might not be. If it's 0 and the prime is not
364 * special, we have a problem.
368 return (DST_R_INVALIDPUBLICKEY);
370 glen = uint16_fromregion(&r);
371 if (r.length < glen) {
373 return (DST_R_INVALIDPUBLICKEY);
379 dh->g = BN_bin2bn(r.base, glen, NULL);
380 if (BN_cmp(dh->g, &bn2) == 0) {
386 return (DST_R_INVALIDPUBLICKEY);
393 return (DST_R_INVALIDPUBLICKEY);
395 dh->g = BN_bin2bn(r.base, glen, NULL);
401 return (DST_R_INVALIDPUBLICKEY);
403 publen = uint16_fromregion(&r);
404 if (r.length < publen) {
406 return (DST_R_INVALIDPUBLICKEY);
408 dh->pub_key = BN_bin2bn(r.base, publen, NULL);
411 key->key_size = BN_num_bits(dh->p);
413 isc_buffer_forward(data, plen + glen + publen + 6);
415 key->keydata.dh = dh;
417 return (ISC_R_SUCCESS);
421 openssldh_tofile(const dst_key_t *key, const char *directory) {
425 unsigned char *bufs[4];
428 if (key->keydata.dh == NULL)
429 return (DST_R_NULLKEY);
431 dh = key->keydata.dh;
433 for (i = 0; i < 4; i++) {
434 bufs[i] = isc_mem_get(key->mctx, BN_num_bytes(dh->p));
435 if (bufs[i] == NULL) {
436 result = ISC_R_NOMEMORY;
443 priv.elements[i].tag = TAG_DH_PRIME;
444 priv.elements[i].length = BN_num_bytes(dh->p);
445 BN_bn2bin(dh->p, bufs[i]);
446 priv.elements[i].data = bufs[i];
449 priv.elements[i].tag = TAG_DH_GENERATOR;
450 priv.elements[i].length = BN_num_bytes(dh->g);
451 BN_bn2bin(dh->g, bufs[i]);
452 priv.elements[i].data = bufs[i];
455 priv.elements[i].tag = TAG_DH_PRIVATE;
456 priv.elements[i].length = BN_num_bytes(dh->priv_key);
457 BN_bn2bin(dh->priv_key, bufs[i]);
458 priv.elements[i].data = bufs[i];
461 priv.elements[i].tag = TAG_DH_PUBLIC;
462 priv.elements[i].length = BN_num_bytes(dh->pub_key);
463 BN_bn2bin(dh->pub_key, bufs[i]);
464 priv.elements[i].data = bufs[i];
468 result = dst__privstruct_writefile(key, &priv, directory);
470 for (i = 0; i < 4; i++) {
473 isc_mem_put(key->mctx, bufs[i], BN_num_bytes(dh->p));
479 openssldh_parse(dst_key_t *key, isc_lex_t *lexer) {
485 #define DST_RET(a) {ret = a; goto err;}
489 /* read private key file */
490 ret = dst__privstruct_parse(key, DST_ALG_DH, lexer, mctx, &priv);
491 if (ret != ISC_R_SUCCESS)
496 DST_RET(ISC_R_NOMEMORY);
497 dh->flags &= ~DH_FLAG_CACHE_MONT_P;
498 key->keydata.dh = dh;
500 for (i = 0; i < priv.nelements; i++) {
502 bn = BN_bin2bn(priv.elements[i].data,
503 priv.elements[i].length, NULL);
505 DST_RET(ISC_R_NOMEMORY);
507 switch (priv.elements[i].tag) {
511 case TAG_DH_GENERATOR:
522 dst__privstruct_free(&priv, mctx);
524 key->key_size = BN_num_bits(dh->p);
526 if ((key->key_size == 768 ||
527 key->key_size == 1024 ||
528 key->key_size == 1536) &&
529 BN_cmp(dh->g, &bn2) == 0)
531 if (key->key_size == 768 && BN_cmp(dh->p, &bn768) == 0) {
536 } else if (key->key_size == 1024 &&
537 BN_cmp(dh->p, &bn1024) == 0) {
542 } else if (key->key_size == 1536 &&
543 BN_cmp(dh->p, &bn1536) == 0) {
551 return (ISC_R_SUCCESS);
554 openssldh_destroy(key);
555 dst__privstruct_free(&priv, mctx);
556 memset(&priv, 0, sizeof(priv));
561 BN_fromhex(BIGNUM *b, const char *str) {
562 static const char hexdigits[] = "0123456789abcdef";
563 unsigned char data[512];
567 RUNTIME_CHECK(strlen(str) < 1024U && strlen(str) % 2 == 0U);
568 for (i = 0; i < strlen(str); i += 2) {
570 unsigned int high, low;
572 s = strchr(hexdigits, tolower((unsigned char)str[i]));
573 RUNTIME_CHECK(s != NULL);
574 high = s - hexdigits;
576 s = strchr(hexdigits, tolower((unsigned char)str[i + 1]));
577 RUNTIME_CHECK(s != NULL);
580 data[i/2] = (unsigned char)((high << 4) + low);
582 out = BN_bin2bn(data, strlen(str)/2, b);
583 RUNTIME_CHECK(out != NULL);
587 openssldh_cleanup(void) {
594 static dst_func_t openssldh_functions = {
595 NULL, /*%< createctx */
596 NULL, /*%< destroyctx */
597 NULL, /*%< adddata */
598 NULL, /*%< openssldh_sign */
599 NULL, /*%< openssldh_verify */
600 openssldh_computesecret,
602 openssldh_paramcompare,
611 NULL, /*%< fromlabel */
615 dst__openssldh_init(dst_func_t **funcp) {
616 REQUIRE(funcp != NULL);
617 if (*funcp == NULL) {
622 BN_set_word(&bn2, 2);
623 BN_fromhex(&bn768, PRIME768);
624 BN_fromhex(&bn1024, PRIME1024);
625 BN_fromhex(&bn1536, PRIME1536);
626 *funcp = &openssldh_functions;
628 return (ISC_R_SUCCESS);
633 #include <isc/util.h>
635 EMPTY_TRANSLATION_UNIT