2 * validator/val_secalgo.c - validator security algorithm functions.
4 * Copyright (c) 2012, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
15 * Redistributions in binary form must reproduce the above copyright notice,
16 * this list of conditions and the following disclaimer in the documentation
17 * and/or other materials provided with the distribution.
19 * Neither the name of the NLNET LABS nor the names of its contributors may
20 * be used to endorse or promote products derived from this software without
21 * specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 * This file contains helper functions for the validator module.
40 * These functions take raw data buffers, formatted for crypto verification,
41 * and do the library calls (for the crypto library in use).
44 /* packed_rrset on top to define enum types (forced by c99 standard) */
45 #include "util/data/packed_rrset.h"
46 #include "validator/val_secalgo.h"
47 #include "validator/val_nsec3.h"
49 #include "sldns/rrdef.h"
50 #include "sldns/keyraw.h"
51 #include "sldns/sbuffer.h"
53 #if !defined(HAVE_SSL) && !defined(HAVE_NSS) && !defined(HAVE_NETTLE)
54 #error "Need crypto library to do digital signature cryptography"
57 /* OpenSSL implementation */
59 #ifdef HAVE_OPENSSL_ERR_H
60 #include <openssl/err.h>
63 #ifdef HAVE_OPENSSL_RAND_H
64 #include <openssl/rand.h>
67 #ifdef HAVE_OPENSSL_CONF_H
68 #include <openssl/conf.h>
71 #ifdef HAVE_OPENSSL_ENGINE_H
72 #include <openssl/engine.h>
75 /** fake DSA support for unit tests */
77 /** fake SHA1 support for unit tests */
80 /* return size of digest if supported, or 0 otherwise */
82 nsec3_hash_algo_size_supported(int id)
86 return SHA_DIGEST_LENGTH;
92 /* perform nsec3 hash. return false on failure */
94 secalgo_nsec3_hash(int algo, unsigned char* buf, size_t len,
99 (void)SHA1(buf, len, res);
107 secalgo_hash_sha256(unsigned char* buf, size_t len, unsigned char* res)
109 (void)SHA256(buf, len, res);
113 * Return size of DS digest according to its hash algorithm.
114 * @param algo: DS digest algo.
115 * @return size in bytes of digest, or 0 if not supported.
118 ds_digest_size_supported(int algo)
122 #if defined(HAVE_EVP_SHA1) && defined(USE_SHA1)
123 return SHA_DIGEST_LENGTH;
125 if(fake_sha1) return 20;
128 #ifdef HAVE_EVP_SHA256
130 return SHA256_DIGEST_LENGTH;
134 /* we support GOST if it can be loaded */
135 (void)sldns_key_EVP_load_gost_id();
136 if(EVP_get_digestbyname("md_gost94"))
142 return SHA384_DIGEST_LENGTH;
150 /** Perform GOST hash */
152 do_gost94(unsigned char* data, size_t len, unsigned char* dest)
154 const EVP_MD* md = EVP_get_digestbyname("md_gost94");
157 return sldns_digest_evp(data, (unsigned int)len, dest, md);
162 secalgo_ds_digest(int algo, unsigned char* buf, size_t len,
166 #if defined(HAVE_EVP_SHA1) && defined(USE_SHA1)
168 (void)SHA1(buf, len, res);
171 #ifdef HAVE_EVP_SHA256
173 (void)SHA256(buf, len, res);
178 if(do_gost94(buf, len, res))
184 (void)SHA384(buf, len, res);
188 verbose(VERB_QUERY, "unknown DS digest algorithm %d",
195 /** return true if DNSKEY algorithm id is supported */
197 dnskey_algo_id_is_supported(int id)
201 /* RFC 6725 deprecates RSAMD5 */
205 #if defined(USE_DSA) && defined(USE_SHA1)
208 if(fake_dsa || fake_sha1) return 1;
213 case LDNS_RSASHA1_NSEC3:
217 if(fake_sha1) return 1;
221 #if defined(HAVE_EVP_SHA256) && defined(USE_SHA2)
224 #if defined(HAVE_EVP_SHA512) && defined(USE_SHA2)
228 case LDNS_ECDSAP256SHA256:
229 case LDNS_ECDSAP384SHA384:
237 #if (defined(HAVE_EVP_SHA256) && defined(USE_SHA2)) || (defined(HAVE_EVP_SHA512) && defined(USE_SHA2)) || defined(USE_ECDSA) || defined(USE_ED25519) || defined(USE_ED448)
243 /* we support GOST if it can be loaded */
244 return sldns_key_EVP_load_gost_id();
252 * Output a libcrypto openssl error to the logfile.
253 * @param str: string to add to it.
254 * @param e: the error to output, error number from ERR_get_error().
257 log_crypto_error(const char* str, unsigned long e)
260 /* or use ERR_error_string if ERR_error_string_n is not avail TODO */
261 ERR_error_string_n(e, buf, sizeof(buf));
262 /* buf now contains */
263 /* error:[error code]:[library name]:[function name]:[reason string] */
264 log_err("%s crypto %s", str, buf);
269 * Setup DSA key digest in DER encoding ...
270 * @param sig: input is signature output alloced ptr (unless failure).
271 * caller must free alloced ptr if this routine returns true.
272 * @param len: input is initial siglen, output is output len.
273 * @return false on failure.
276 setup_dsa_sig(unsigned char** sig, unsigned int* len)
278 unsigned char* orig = *sig;
279 unsigned int origlen = *len;
284 /* extract the R and S field from the sig buffer */
285 if(origlen < 1 + 2*SHA_DIGEST_LENGTH)
289 (void) BN_bin2bn(orig + 1, SHA_DIGEST_LENGTH, R);
292 (void) BN_bin2bn(orig + 21, SHA_DIGEST_LENGTH, S);
293 dsasig = DSA_SIG_new();
294 if(!dsasig) return 0;
296 #ifdef HAVE_DSA_SIG_SET0
297 if(!DSA_SIG_set0(dsasig, R, S)) return 0;
303 newlen = i2d_DSA_SIG(dsasig, sig);
305 DSA_SIG_free(dsasig);
309 *len = (unsigned int)newlen;
310 DSA_SIG_free(dsasig);
317 * Setup the ECDSA signature in its encoding that the library wants.
318 * Converts from plain numbers to ASN formatted.
319 * @param sig: input is signature, output alloced ptr (unless failure).
320 * caller must free alloced ptr if this routine returns true.
321 * @param len: input is initial siglen, output is output len.
322 * @return false on failure.
325 setup_ecdsa_sig(unsigned char** sig, unsigned int* len)
327 /* convert from two BIGNUMs in the rdata buffer, to ASN notation.
328 * ASN preamble: 30440220 <R 32bytefor256> 0220 <S 32bytefor256>
329 * the '20' is the length of that field (=bnsize).
330 i * the '44' is the total remaining length.
331 * if negative, start with leading zero.
332 * if starts with 00s, remove them from the number.
334 uint8_t pre[] = {0x30, 0x44, 0x02, 0x20};
336 uint8_t mid[] = {0x02, 0x20};
338 int raw_sig_len, r_high, s_high, r_rem=0, s_rem=0;
339 int bnsize = (int)((*len)/2);
340 unsigned char* d = *sig;
342 /* if too short or not even length, fails */
343 if(*len < 16 || bnsize*2 != (int)*len)
346 /* strip leading zeroes from r (but not last one) */
347 while(r_rem < bnsize-1 && d[r_rem] == 0)
349 /* strip leading zeroes from s (but not last one) */
350 while(s_rem < bnsize-1 && d[bnsize+s_rem] == 0)
353 r_high = ((d[0+r_rem]&0x80)?1:0);
354 s_high = ((d[bnsize+s_rem]&0x80)?1:0);
355 raw_sig_len = pre_len + r_high + bnsize - r_rem + mid_len +
356 s_high + bnsize - s_rem;
357 *sig = (unsigned char*)malloc((size_t)raw_sig_len);
362 p[1] = (uint8_t)(raw_sig_len-2);
364 p[3] = (uint8_t)(bnsize + r_high - r_rem);
370 memmove(p, d+r_rem, (size_t)bnsize-r_rem);
372 memmove(p, mid, (size_t)mid_len-1);
374 *p = (uint8_t)(bnsize + s_high - s_rem);
380 memmove(p, d+bnsize+s_rem, (size_t)bnsize-s_rem);
381 *len = (unsigned int)raw_sig_len;
384 #endif /* USE_ECDSA */
386 #ifdef USE_ECDSA_EVP_WORKAROUND
387 static EVP_MD ecdsa_evp_256_md;
388 static EVP_MD ecdsa_evp_384_md;
389 void ecdsa_evp_workaround_init(void)
391 /* openssl before 1.0.0 fixes RSA with the SHA256
392 * hash in EVP. We create one for ecdsa_sha256 */
393 ecdsa_evp_256_md = *EVP_sha256();
394 ecdsa_evp_256_md.required_pkey_type[0] = EVP_PKEY_EC;
395 ecdsa_evp_256_md.verify = (void*)ECDSA_verify;
397 ecdsa_evp_384_md = *EVP_sha384();
398 ecdsa_evp_384_md.required_pkey_type[0] = EVP_PKEY_EC;
399 ecdsa_evp_384_md.verify = (void*)ECDSA_verify;
401 #endif /* USE_ECDSA_EVP_WORKAROUND */
404 * Setup key and digest for verification. Adjust sig if necessary.
406 * @param algo: key algorithm
407 * @param evp_key: EVP PKEY public key to create.
408 * @param digest_type: digest type to use
409 * @param key: key to setup for.
410 * @param keylen: length of key.
411 * @return false on failure.
414 setup_key_digest(int algo, EVP_PKEY** evp_key, const EVP_MD** digest_type,
415 unsigned char* key, size_t keylen)
417 #if defined(USE_DSA) && defined(USE_SHA1)
423 #if defined(USE_DSA) && defined(USE_SHA1)
426 *evp_key = EVP_PKEY_new();
428 log_err("verify: malloc failure in crypto");
431 dsa = sldns_key_buf2dsa_raw(key, keylen);
433 verbose(VERB_QUERY, "verify: "
434 "sldns_key_buf2dsa_raw failed");
437 if(EVP_PKEY_assign_DSA(*evp_key, dsa) == 0) {
438 verbose(VERB_QUERY, "verify: "
439 "EVP_PKEY_assign_DSA failed");
443 *digest_type = EVP_dss1();
445 *digest_type = EVP_sha1();
449 #endif /* USE_DSA && USE_SHA1 */
451 #if defined(USE_SHA1) || (defined(HAVE_EVP_SHA256) && defined(USE_SHA2)) || (defined(HAVE_EVP_SHA512) && defined(USE_SHA2))
454 case LDNS_RSASHA1_NSEC3:
456 #if defined(HAVE_EVP_SHA256) && defined(USE_SHA2)
459 #if defined(HAVE_EVP_SHA512) && defined(USE_SHA2)
462 *evp_key = EVP_PKEY_new();
464 log_err("verify: malloc failure in crypto");
467 rsa = sldns_key_buf2rsa_raw(key, keylen);
469 verbose(VERB_QUERY, "verify: "
470 "sldns_key_buf2rsa_raw SHA failed");
473 if(EVP_PKEY_assign_RSA(*evp_key, rsa) == 0) {
474 verbose(VERB_QUERY, "verify: "
475 "EVP_PKEY_assign_RSA SHA failed");
479 /* select SHA version */
480 #if defined(HAVE_EVP_SHA256) && defined(USE_SHA2)
481 if(algo == LDNS_RSASHA256)
482 *digest_type = EVP_sha256();
485 #if defined(HAVE_EVP_SHA512) && defined(USE_SHA2)
486 if(algo == LDNS_RSASHA512)
487 *digest_type = EVP_sha512();
491 *digest_type = EVP_sha1();
493 { verbose(VERB_QUERY, "no digest available"); return 0; }
496 #endif /* defined(USE_SHA1) || (defined(HAVE_EVP_SHA256) && defined(USE_SHA2)) || (defined(HAVE_EVP_SHA512) && defined(USE_SHA2)) */
499 *evp_key = EVP_PKEY_new();
501 log_err("verify: malloc failure in crypto");
504 rsa = sldns_key_buf2rsa_raw(key, keylen);
506 verbose(VERB_QUERY, "verify: "
507 "sldns_key_buf2rsa_raw MD5 failed");
510 if(EVP_PKEY_assign_RSA(*evp_key, rsa) == 0) {
511 verbose(VERB_QUERY, "verify: "
512 "EVP_PKEY_assign_RSA MD5 failed");
515 *digest_type = EVP_md5();
520 *evp_key = sldns_gost2pkey_raw(key, keylen);
522 verbose(VERB_QUERY, "verify: "
523 "sldns_gost2pkey_raw failed");
526 *digest_type = EVP_get_digestbyname("md_gost94");
528 verbose(VERB_QUERY, "verify: "
529 "EVP_getdigest md_gost94 failed");
535 case LDNS_ECDSAP256SHA256:
536 *evp_key = sldns_ecdsa2pkey_raw(key, keylen,
537 LDNS_ECDSAP256SHA256);
539 verbose(VERB_QUERY, "verify: "
540 "sldns_ecdsa2pkey_raw failed");
543 #ifdef USE_ECDSA_EVP_WORKAROUND
544 *digest_type = &ecdsa_evp_256_md;
546 *digest_type = EVP_sha256();
549 case LDNS_ECDSAP384SHA384:
550 *evp_key = sldns_ecdsa2pkey_raw(key, keylen,
551 LDNS_ECDSAP384SHA384);
553 verbose(VERB_QUERY, "verify: "
554 "sldns_ecdsa2pkey_raw failed");
557 #ifdef USE_ECDSA_EVP_WORKAROUND
558 *digest_type = &ecdsa_evp_384_md;
560 *digest_type = EVP_sha384();
563 #endif /* USE_ECDSA */
566 *evp_key = sldns_ed255192pkey_raw(key, keylen);
568 verbose(VERB_QUERY, "verify: "
569 "sldns_ed255192pkey_raw failed");
574 #endif /* USE_ED25519 */
577 *evp_key = sldns_ed4482pkey_raw(key, keylen);
579 verbose(VERB_QUERY, "verify: "
580 "sldns_ed4482pkey_raw failed");
585 #endif /* USE_ED448 */
587 verbose(VERB_QUERY, "verify: unknown algorithm %d",
595 * Check a canonical sig+rrset and signature against a dnskey
596 * @param buf: buffer with data to verify, the first rrsig part and the
597 * canonicalized rrset.
598 * @param algo: DNSKEY algorithm.
599 * @param sigblock: signature rdata field from RRSIG
600 * @param sigblock_len: length of sigblock data.
601 * @param key: public key data from DNSKEY RR.
602 * @param keylen: length of keydata.
603 * @param reason: bogus reason in more detail.
604 * @return secure if verification succeeded, bogus on crypto failure,
605 * unchecked on format errors and alloc failures.
608 verify_canonrrset(sldns_buffer* buf, int algo, unsigned char* sigblock,
609 unsigned int sigblock_len, unsigned char* key, unsigned int keylen,
612 const EVP_MD *digest_type;
614 int res, dofree = 0, docrypto_free = 0;
615 EVP_PKEY *evp_key = NULL;
618 if((algo == LDNS_DSA || algo == LDNS_DSA_NSEC3) &&(fake_dsa||fake_sha1))
619 return sec_status_secure;
622 if(fake_sha1 && (algo == LDNS_DSA || algo == LDNS_DSA_NSEC3 || algo == LDNS_RSASHA1 || algo == LDNS_RSASHA1_NSEC3))
623 return sec_status_secure;
626 if(!setup_key_digest(algo, &evp_key, &digest_type, key, keylen)) {
627 verbose(VERB_QUERY, "verify: failed to setup key");
628 *reason = "use of key for crypto failed";
629 EVP_PKEY_free(evp_key);
630 return sec_status_bogus;
633 /* if it is a DSA signature in bind format, convert to DER format */
634 if((algo == LDNS_DSA || algo == LDNS_DSA_NSEC3) &&
635 sigblock_len == 1+2*SHA_DIGEST_LENGTH) {
636 if(!setup_dsa_sig(&sigblock, &sigblock_len)) {
637 verbose(VERB_QUERY, "verify: failed to setup DSA sig");
638 *reason = "use of key for DSA crypto failed";
639 EVP_PKEY_free(evp_key);
640 return sec_status_bogus;
645 #if defined(USE_ECDSA) && defined(USE_DSA)
649 if(algo == LDNS_ECDSAP256SHA256 || algo == LDNS_ECDSAP384SHA384) {
650 /* EVP uses ASN prefix on sig, which is not in the wire data */
651 if(!setup_ecdsa_sig(&sigblock, &sigblock_len)) {
652 verbose(VERB_QUERY, "verify: failed to setup ECDSA sig");
653 *reason = "use of signature for ECDSA crypto failed";
654 EVP_PKEY_free(evp_key);
655 return sec_status_bogus;
659 #endif /* USE_ECDSA */
661 /* do the signature cryptography work */
662 #ifdef HAVE_EVP_MD_CTX_NEW
663 ctx = EVP_MD_CTX_new();
665 ctx = (EVP_MD_CTX*)malloc(sizeof(*ctx));
666 if(ctx) EVP_MD_CTX_init(ctx);
669 log_err("EVP_MD_CTX_new: malloc failure");
670 EVP_PKEY_free(evp_key);
671 if(dofree) free(sigblock);
672 else if(docrypto_free) OPENSSL_free(sigblock);
673 return sec_status_unchecked;
675 #ifndef HAVE_EVP_DIGESTVERIFY
676 if(EVP_DigestInit(ctx, digest_type) == 0) {
677 verbose(VERB_QUERY, "verify: EVP_DigestInit failed");
678 #ifdef HAVE_EVP_MD_CTX_NEW
679 EVP_MD_CTX_destroy(ctx);
681 EVP_MD_CTX_cleanup(ctx);
684 EVP_PKEY_free(evp_key);
685 if(dofree) free(sigblock);
686 else if(docrypto_free) OPENSSL_free(sigblock);
687 return sec_status_unchecked;
689 if(EVP_DigestUpdate(ctx, (unsigned char*)sldns_buffer_begin(buf),
690 (unsigned int)sldns_buffer_limit(buf)) == 0) {
691 verbose(VERB_QUERY, "verify: EVP_DigestUpdate failed");
692 #ifdef HAVE_EVP_MD_CTX_NEW
693 EVP_MD_CTX_destroy(ctx);
695 EVP_MD_CTX_cleanup(ctx);
698 EVP_PKEY_free(evp_key);
699 if(dofree) free(sigblock);
700 else if(docrypto_free) OPENSSL_free(sigblock);
701 return sec_status_unchecked;
704 res = EVP_VerifyFinal(ctx, sigblock, sigblock_len, evp_key);
705 #else /* HAVE_EVP_DIGESTVERIFY */
706 if(EVP_DigestVerifyInit(ctx, NULL, digest_type, NULL, evp_key) == 0) {
707 verbose(VERB_QUERY, "verify: EVP_DigestVerifyInit failed");
708 #ifdef HAVE_EVP_MD_CTX_NEW
709 EVP_MD_CTX_destroy(ctx);
711 EVP_MD_CTX_cleanup(ctx);
714 EVP_PKEY_free(evp_key);
715 if(dofree) free(sigblock);
716 else if(docrypto_free) OPENSSL_free(sigblock);
717 return sec_status_unchecked;
719 res = EVP_DigestVerify(ctx, sigblock, sigblock_len,
720 (unsigned char*)sldns_buffer_begin(buf),
721 sldns_buffer_limit(buf));
723 #ifdef HAVE_EVP_MD_CTX_NEW
724 EVP_MD_CTX_destroy(ctx);
726 EVP_MD_CTX_cleanup(ctx);
729 EVP_PKEY_free(evp_key);
731 if(dofree) free(sigblock);
732 else if(docrypto_free) OPENSSL_free(sigblock);
735 return sec_status_secure;
736 } else if(res == 0) {
737 verbose(VERB_QUERY, "verify: signature mismatch");
738 *reason = "signature crypto failed";
739 return sec_status_bogus;
742 log_crypto_error("verify:", ERR_get_error());
743 return sec_status_unchecked;
746 /**************************************************/
747 #elif defined(HAVE_NSS)
748 /* libnss implementation */
754 #include "cryptohi.h"
758 /* return size of digest if supported, or 0 otherwise */
760 nsec3_hash_algo_size_supported(int id)
763 case NSEC3_HASH_SHA1:
770 /* perform nsec3 hash. return false on failure */
772 secalgo_nsec3_hash(int algo, unsigned char* buf, size_t len,
776 case NSEC3_HASH_SHA1:
777 (void)HASH_HashBuf(HASH_AlgSHA1, res, buf, (unsigned long)len);
785 secalgo_hash_sha256(unsigned char* buf, size_t len, unsigned char* res)
787 (void)HASH_HashBuf(HASH_AlgSHA256, res, buf, (unsigned long)len);
791 ds_digest_size_supported(int algo)
801 return SHA256_LENGTH;
805 return SHA384_LENGTH;
807 /* GOST not supported in NSS */
815 secalgo_ds_digest(int algo, unsigned char* buf, size_t len,
822 return HASH_HashBuf(HASH_AlgSHA1, res, buf, len)
825 #if defined(USE_SHA2)
827 return HASH_HashBuf(HASH_AlgSHA256, res, buf, len)
832 return HASH_HashBuf(HASH_AlgSHA384, res, buf, len)
837 verbose(VERB_QUERY, "unknown DS digest algorithm %d",
845 dnskey_algo_id_is_supported(int id)
850 /* RFC 6725 deprecates RSAMD5 */
852 #if defined(USE_SHA1) || defined(USE_SHA2)
853 #if defined(USE_DSA) && defined(USE_SHA1)
859 case LDNS_RSASHA1_NSEC3:
868 #endif /* SHA1 or SHA2 */
871 case LDNS_ECDSAP256SHA256:
872 case LDNS_ECDSAP384SHA384:
873 return PK11_TokenExists(CKM_ECDSA);
881 /* return a new public key for NSS */
882 static SECKEYPublicKey* nss_key_create(KeyType ktype)
884 SECKEYPublicKey* key;
885 PLArenaPool* arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
887 log_err("out of memory, PORT_NewArena failed");
890 key = PORT_ArenaZNew(arena, SECKEYPublicKey);
892 log_err("out of memory, PORT_ArenaZNew failed");
893 PORT_FreeArena(arena, PR_FALSE);
897 key->keyType = ktype;
898 key->pkcs11Slot = NULL;
899 key->pkcs11ID = CK_INVALID_HANDLE;
903 static SECKEYPublicKey* nss_buf2ecdsa(unsigned char* key, size_t len, int algo)
906 SECItem pub = {siBuffer, NULL, 0};
907 SECItem params = {siBuffer, NULL, 0};
908 static unsigned char param256[] = {
909 /* OBJECTIDENTIFIER 1.2.840.10045.3.1.7 (P-256)
910 * {iso(1) member-body(2) us(840) ansi-x962(10045) curves(3) prime(1) prime256v1(7)} */
911 0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07
913 static unsigned char param384[] = {
914 /* OBJECTIDENTIFIER 1.3.132.0.34 (P-384)
915 * {iso(1) identified-organization(3) certicom(132) curve(0) ansip384r1(34)} */
916 0x06, 0x05, 0x2b, 0x81, 0x04, 0x00, 0x22
918 unsigned char buf[256+2]; /* sufficient for 2*384/8+1 */
920 /* check length, which uncompressed must be 2 bignums */
921 if(algo == LDNS_ECDSAP256SHA256) {
922 if(len != 2*256/8) return NULL;
923 /* ECCurve_X9_62_PRIME_256V1 */
924 } else if(algo == LDNS_ECDSAP384SHA384) {
925 if(len != 2*384/8) return NULL;
926 /* ECCurve_X9_62_PRIME_384R1 */
929 buf[0] = 0x04; /* POINT_FORM_UNCOMPRESSED */
930 memmove(buf+1, key, len);
933 if(algo == LDNS_ECDSAP256SHA256) {
934 params.data = param256;
935 params.len = sizeof(param256);
937 params.data = param384;
938 params.len = sizeof(param384);
941 pk = nss_key_create(ecKey);
944 pk->u.ec.size = (len/2)*8;
945 if(SECITEM_CopyItem(pk->arena, &pk->u.ec.publicValue, &pub)) {
946 SECKEY_DestroyPublicKey(pk);
949 if(SECITEM_CopyItem(pk->arena, &pk->u.ec.DEREncodedParams, ¶ms)) {
950 SECKEY_DestroyPublicKey(pk);
957 static SECKEYPublicKey* nss_buf2dsa(unsigned char* key, size_t len)
963 SECItem Q = {siBuffer, NULL, 0};
964 SECItem P = {siBuffer, NULL, 0};
965 SECItem G = {siBuffer, NULL, 0};
966 SECItem Y = {siBuffer, NULL, 0};
971 length = (64 + T * 8);
977 if(len < (size_t)1 + SHA1_LENGTH + 3*length)
982 offset += SHA1_LENGTH;
996 pk = nss_key_create(dsaKey);
999 if(SECITEM_CopyItem(pk->arena, &pk->u.dsa.params.prime, &P)) {
1000 SECKEY_DestroyPublicKey(pk);
1003 if(SECITEM_CopyItem(pk->arena, &pk->u.dsa.params.subPrime, &Q)) {
1004 SECKEY_DestroyPublicKey(pk);
1007 if(SECITEM_CopyItem(pk->arena, &pk->u.dsa.params.base, &G)) {
1008 SECKEY_DestroyPublicKey(pk);
1011 if(SECITEM_CopyItem(pk->arena, &pk->u.dsa.publicValue, &Y)) {
1012 SECKEY_DestroyPublicKey(pk);
1018 static SECKEYPublicKey* nss_buf2rsa(unsigned char* key, size_t len)
1020 SECKEYPublicKey* pk;
1024 SECItem modulus = {siBuffer, NULL, 0};
1025 SECItem exponent = {siBuffer, NULL, 0};
1031 /* the exponent is too large so it's places further */
1032 memmove(&int16, key+1, 2);
1040 /* key length at least one */
1041 if(len < (size_t)offset + exp + 1)
1044 exponent.data = key+offset;
1047 modulus.data = key+offset;
1048 modulus.len = (len - offset);
1050 pk = nss_key_create(rsaKey);
1053 if(SECITEM_CopyItem(pk->arena, &pk->u.rsa.modulus, &modulus)) {
1054 SECKEY_DestroyPublicKey(pk);
1057 if(SECITEM_CopyItem(pk->arena, &pk->u.rsa.publicExponent, &exponent)) {
1058 SECKEY_DestroyPublicKey(pk);
1065 * Setup key and digest for verification. Adjust sig if necessary.
1067 * @param algo: key algorithm
1068 * @param evp_key: EVP PKEY public key to create.
1069 * @param digest_type: digest type to use
1070 * @param key: key to setup for.
1071 * @param keylen: length of key.
1072 * @param prefix: if returned, the ASN prefix for the hashblob.
1073 * @param prefixlen: length of the prefix.
1074 * @return false on failure.
1077 nss_setup_key_digest(int algo, SECKEYPublicKey** pubkey, HASH_HashType* htype,
1078 unsigned char* key, size_t keylen, unsigned char** prefix,
1083 /* hash prefix for md5, RFC2537 */
1084 static unsigned char p_md5[] = {0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a,
1085 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10};
1086 /* hash prefix to prepend to hash output, from RFC3110 */
1087 static unsigned char p_sha1[] = {0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B,
1088 0x0E, 0x03, 0x02, 0x1A, 0x05, 0x00, 0x04, 0x14};
1090 static unsigned char p_sha256[] = {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60,
1091 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20};
1092 static unsigned char p_sha512[] = {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60,
1093 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40};
1095 /* for future RSASHA384 ..
1096 static unsigned char p_sha384[] = {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60,
1097 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30};
1102 #if defined(USE_SHA1) || defined(USE_SHA2)
1103 #if defined(USE_DSA) && defined(USE_SHA1)
1105 case LDNS_DSA_NSEC3:
1106 *pubkey = nss_buf2dsa(key, keylen);
1108 log_err("verify: malloc failure in crypto");
1111 *htype = HASH_AlgSHA1;
1112 /* no prefix for DSA verification */
1117 case LDNS_RSASHA1_NSEC3:
1120 case LDNS_RSASHA256:
1123 case LDNS_RSASHA512:
1125 *pubkey = nss_buf2rsa(key, keylen);
1127 log_err("verify: malloc failure in crypto");
1130 /* select SHA version */
1132 if(algo == LDNS_RSASHA256) {
1133 *htype = HASH_AlgSHA256;
1135 *prefixlen = sizeof(p_sha256);
1139 if(algo == LDNS_RSASHA512) {
1140 *htype = HASH_AlgSHA512;
1142 *prefixlen = sizeof(p_sha512);
1147 *htype = HASH_AlgSHA1;
1149 *prefixlen = sizeof(p_sha1);
1153 verbose(VERB_QUERY, "verify: no digest algo");
1159 #endif /* SHA1 or SHA2 */
1162 *pubkey = nss_buf2rsa(key, keylen);
1164 log_err("verify: malloc failure in crypto");
1167 *htype = HASH_AlgMD5;
1169 *prefixlen = sizeof(p_md5);
1173 case LDNS_ECDSAP256SHA256:
1174 *pubkey = nss_buf2ecdsa(key, keylen,
1175 LDNS_ECDSAP256SHA256);
1177 log_err("verify: malloc failure in crypto");
1180 *htype = HASH_AlgSHA256;
1181 /* no prefix for DSA verification */
1183 case LDNS_ECDSAP384SHA384:
1184 *pubkey = nss_buf2ecdsa(key, keylen,
1185 LDNS_ECDSAP384SHA384);
1187 log_err("verify: malloc failure in crypto");
1190 *htype = HASH_AlgSHA384;
1191 /* no prefix for DSA verification */
1193 #endif /* USE_ECDSA */
1196 verbose(VERB_QUERY, "verify: unknown algorithm %d",
1204 * Check a canonical sig+rrset and signature against a dnskey
1205 * @param buf: buffer with data to verify, the first rrsig part and the
1206 * canonicalized rrset.
1207 * @param algo: DNSKEY algorithm.
1208 * @param sigblock: signature rdata field from RRSIG
1209 * @param sigblock_len: length of sigblock data.
1210 * @param key: public key data from DNSKEY RR.
1211 * @param keylen: length of keydata.
1212 * @param reason: bogus reason in more detail.
1213 * @return secure if verification succeeded, bogus on crypto failure,
1214 * unchecked on format errors and alloc failures.
1217 verify_canonrrset(sldns_buffer* buf, int algo, unsigned char* sigblock,
1218 unsigned int sigblock_len, unsigned char* key, unsigned int keylen,
1222 /* large enough for the different hashes */
1223 unsigned char hash[HASH_LENGTH_MAX];
1224 unsigned char hash2[HASH_LENGTH_MAX*2];
1225 HASH_HashType htype = 0;
1226 SECKEYPublicKey* pubkey = NULL;
1227 SECItem secsig = {siBuffer, sigblock, sigblock_len};
1228 SECItem sechash = {siBuffer, hash, 0};
1230 unsigned char* prefix = NULL; /* prefix for hash, RFC3110, RFC5702 */
1231 size_t prefixlen = 0;
1234 if(!nss_setup_key_digest(algo, &pubkey, &htype, key, keylen,
1235 &prefix, &prefixlen)) {
1236 verbose(VERB_QUERY, "verify: failed to setup key");
1237 *reason = "use of key for crypto failed";
1238 SECKEY_DestroyPublicKey(pubkey);
1239 return sec_status_bogus;
1242 #if defined(USE_DSA) && defined(USE_SHA1)
1243 /* need to convert DSA, ECDSA signatures? */
1244 if((algo == LDNS_DSA || algo == LDNS_DSA_NSEC3)) {
1245 if(sigblock_len == 1+2*SHA1_LENGTH) {
1249 SECItem* p = DSAU_DecodeDerSig(&secsig);
1251 verbose(VERB_QUERY, "verify: failed DER decode");
1252 *reason = "signature DER decode failed";
1253 SECKEY_DestroyPublicKey(pubkey);
1254 return sec_status_bogus;
1256 if(SECITEM_CopyItem(pubkey->arena, &secsig, p)) {
1257 log_err("alloc failure in DER decode");
1258 SECKEY_DestroyPublicKey(pubkey);
1259 SECITEM_FreeItem(p, PR_TRUE);
1260 return sec_status_unchecked;
1262 SECITEM_FreeItem(p, PR_TRUE);
1265 #endif /* USE_DSA */
1267 /* do the signature cryptography work */
1269 sechash.len = HASH_ResultLen(htype);
1270 if(sechash.len > sizeof(hash)) {
1271 verbose(VERB_QUERY, "verify: hash too large for buffer");
1272 SECKEY_DestroyPublicKey(pubkey);
1273 return sec_status_unchecked;
1275 if(HASH_HashBuf(htype, hash, (unsigned char*)sldns_buffer_begin(buf),
1276 (unsigned int)sldns_buffer_limit(buf)) != SECSuccess) {
1277 verbose(VERB_QUERY, "verify: HASH_HashBuf failed");
1278 SECKEY_DestroyPublicKey(pubkey);
1279 return sec_status_unchecked;
1282 int hashlen = sechash.len;
1283 if(prefixlen+hashlen > sizeof(hash2)) {
1284 verbose(VERB_QUERY, "verify: hashprefix too large");
1285 SECKEY_DestroyPublicKey(pubkey);
1286 return sec_status_unchecked;
1288 sechash.data = hash2;
1289 sechash.len = prefixlen+hashlen;
1290 memcpy(sechash.data, prefix, prefixlen);
1291 memmove(sechash.data+prefixlen, hash, hashlen);
1294 /* verify the signature */
1295 res = PK11_Verify(pubkey, &secsig, &sechash, NULL /*wincx*/);
1296 SECKEY_DestroyPublicKey(pubkey);
1298 if(res == SECSuccess) {
1299 return sec_status_secure;
1301 err = PORT_GetError();
1302 if(err != SEC_ERROR_BAD_SIGNATURE) {
1303 /* failed to verify */
1304 verbose(VERB_QUERY, "verify: PK11_Verify failed: %s",
1305 PORT_ErrorToString(err));
1306 /* if it is not supported, like ECC is removed, we get,
1307 * SEC_ERROR_NO_MODULE */
1308 if(err == SEC_ERROR_NO_MODULE)
1309 return sec_status_unchecked;
1310 /* but other errors are commonly returned
1311 * for a bad signature from NSS. Thus we return bogus,
1313 *reason = "signature crypto failed";
1314 return sec_status_bogus;
1316 verbose(VERB_QUERY, "verify: signature mismatch: %s",
1317 PORT_ErrorToString(err));
1318 *reason = "signature crypto failed";
1319 return sec_status_bogus;
1322 #elif defined(HAVE_NETTLE)
1329 #ifdef HAVE_NETTLE_DSA_COMPAT_H
1330 #include "dsa-compat.h"
1335 #include "ecc-curve.h"
1337 #ifdef HAVE_NETTLE_EDDSA_H
1342 _digest_nettle(int algo, uint8_t* buf, size_t len,
1346 case SHA1_DIGEST_SIZE:
1348 struct sha1_ctx ctx;
1350 sha1_update(&ctx, len, buf);
1351 sha1_digest(&ctx, SHA1_DIGEST_SIZE, res);
1354 case SHA256_DIGEST_SIZE:
1356 struct sha256_ctx ctx;
1358 sha256_update(&ctx, len, buf);
1359 sha256_digest(&ctx, SHA256_DIGEST_SIZE, res);
1362 case SHA384_DIGEST_SIZE:
1364 struct sha384_ctx ctx;
1366 sha384_update(&ctx, len, buf);
1367 sha384_digest(&ctx, SHA384_DIGEST_SIZE, res);
1370 case SHA512_DIGEST_SIZE:
1372 struct sha512_ctx ctx;
1374 sha512_update(&ctx, len, buf);
1375 sha512_digest(&ctx, SHA512_DIGEST_SIZE, res);
1384 /* return size of digest if supported, or 0 otherwise */
1386 nsec3_hash_algo_size_supported(int id)
1389 case NSEC3_HASH_SHA1:
1390 return SHA1_DIGEST_SIZE;
1396 /* perform nsec3 hash. return false on failure */
1398 secalgo_nsec3_hash(int algo, unsigned char* buf, size_t len,
1402 case NSEC3_HASH_SHA1:
1403 return _digest_nettle(SHA1_DIGEST_SIZE, (uint8_t*)buf, len,
1411 secalgo_hash_sha256(unsigned char* buf, size_t len, unsigned char* res)
1413 _digest_nettle(SHA256_DIGEST_SIZE, (uint8_t*)buf, len, res);
1417 * Return size of DS digest according to its hash algorithm.
1418 * @param algo: DS digest algo.
1419 * @return size in bytes of digest, or 0 if not supported.
1422 ds_digest_size_supported(int algo)
1427 return SHA1_DIGEST_SIZE;
1429 if(fake_sha1) return 20;
1434 return SHA256_DIGEST_SIZE;
1438 return SHA384_DIGEST_SIZE;
1440 /* GOST not supported */
1441 case LDNS_HASH_GOST:
1449 secalgo_ds_digest(int algo, unsigned char* buf, size_t len,
1455 return _digest_nettle(SHA1_DIGEST_SIZE, buf, len, res);
1457 #if defined(USE_SHA2)
1459 return _digest_nettle(SHA256_DIGEST_SIZE, buf, len, res);
1463 return _digest_nettle(SHA384_DIGEST_SIZE, buf, len, res);
1466 case LDNS_HASH_GOST:
1468 verbose(VERB_QUERY, "unknown DS digest algorithm %d",
1476 dnskey_algo_id_is_supported(int id)
1478 /* uses libnettle */
1480 #if defined(USE_DSA) && defined(USE_SHA1)
1482 case LDNS_DSA_NSEC3:
1486 case LDNS_RSASHA1_NSEC3:
1489 case LDNS_RSASHA256:
1490 case LDNS_RSASHA512:
1493 case LDNS_ECDSAP256SHA256:
1494 case LDNS_ECDSAP384SHA384:
1501 case LDNS_RSAMD5: /* RFC 6725 deprecates RSAMD5 */
1508 #if defined(USE_DSA) && defined(USE_SHA1)
1510 _verify_nettle_dsa(sldns_buffer* buf, unsigned char* sigblock,
1511 unsigned int sigblock_len, unsigned char* key, unsigned int keylen)
1513 uint8_t digest[SHA1_DIGEST_SIZE];
1514 uint8_t key_t_value;
1517 struct dsa_public_key pubkey;
1518 struct dsa_signature signature;
1519 unsigned int expected_len;
1521 /* Extract DSA signature from the record */
1522 nettle_dsa_signature_init(&signature);
1523 /* Signature length: 41 bytes - RFC 2536 sec. 3 */
1524 if(sigblock_len == 41) {
1525 if(key[0] != sigblock[0])
1526 return "invalid T value in DSA signature or pubkey";
1527 nettle_mpz_set_str_256_u(signature.r, 20, sigblock+1);
1528 nettle_mpz_set_str_256_u(signature.s, 20, sigblock+1+20);
1530 /* DER encoded, decode the ASN1 notated R and S bignums */
1531 /* SEQUENCE { r INTEGER, s INTEGER } */
1532 struct asn1_der_iterator i, seq;
1533 if(asn1_der_iterator_first(&i, sigblock_len,
1534 (uint8_t*)sigblock) != ASN1_ITERATOR_CONSTRUCTED
1535 || i.type != ASN1_SEQUENCE)
1536 return "malformed DER encoded DSA signature";
1537 /* decode this element of i using the seq iterator */
1538 if(asn1_der_decode_constructed(&i, &seq) !=
1539 ASN1_ITERATOR_PRIMITIVE || seq.type != ASN1_INTEGER)
1540 return "malformed DER encoded DSA signature";
1541 if(!asn1_der_get_bignum(&seq, signature.r, 20*8))
1542 return "malformed DER encoded DSA signature";
1543 if(asn1_der_iterator_next(&seq) != ASN1_ITERATOR_PRIMITIVE
1544 || seq.type != ASN1_INTEGER)
1545 return "malformed DER encoded DSA signature";
1546 if(!asn1_der_get_bignum(&seq, signature.s, 20*8))
1547 return "malformed DER encoded DSA signature";
1548 if(asn1_der_iterator_next(&i) != ASN1_ITERATOR_END)
1549 return "malformed DER encoded DSA signature";
1552 /* Validate T values constraints - RFC 2536 sec. 2 & sec. 3 */
1553 key_t_value = key[0];
1554 if (key_t_value > 8) {
1555 return "invalid T value in DSA pubkey";
1558 /* Pubkey minimum length: 21 bytes - RFC 2536 sec. 2 */
1560 return "DSA pubkey too short";
1563 expected_len = 1 + /* T */
1565 (64 + key_t_value*8) + /* P */
1566 (64 + key_t_value*8) + /* G */
1567 (64 + key_t_value*8); /* Y */
1568 if (keylen != expected_len ) {
1569 return "invalid DSA pubkey length";
1572 /* Extract DSA pubkey from the record */
1573 nettle_dsa_public_key_init(&pubkey);
1575 nettle_mpz_set_str_256_u(pubkey.q, 20, key+offset);
1577 nettle_mpz_set_str_256_u(pubkey.p, (64 + key_t_value*8), key+offset);
1578 offset += (64 + key_t_value*8);
1579 nettle_mpz_set_str_256_u(pubkey.g, (64 + key_t_value*8), key+offset);
1580 offset += (64 + key_t_value*8);
1581 nettle_mpz_set_str_256_u(pubkey.y, (64 + key_t_value*8), key+offset);
1583 /* Digest content of "buf" and verify its DSA signature in "sigblock"*/
1584 res = _digest_nettle(SHA1_DIGEST_SIZE, (unsigned char*)sldns_buffer_begin(buf),
1585 (unsigned int)sldns_buffer_limit(buf), (unsigned char*)digest);
1586 res &= dsa_sha1_verify_digest(&pubkey, digest, &signature);
1588 /* Clear and return */
1589 nettle_dsa_signature_clear(&signature);
1590 nettle_dsa_public_key_clear(&pubkey);
1592 return "DSA signature verification failed";
1596 #endif /* USE_DSA */
1599 _verify_nettle_rsa(sldns_buffer* buf, unsigned int digest_size, char* sigblock,
1600 unsigned int sigblock_len, uint8_t* key, unsigned int keylen)
1602 uint16_t exp_len = 0;
1603 size_t exp_offset = 0, mod_offset = 0;
1604 struct rsa_public_key pubkey;
1608 /* RSA pubkey parsing as per RFC 3110 sec. 2 */
1610 return "null RSA key";
1617 /* 1-byte NUL + 2-bytes exponent length */
1619 return "incorrect RSA key length";
1621 exp_len = READ_UINT16(key+1);
1623 return "null RSA exponent length";
1626 /* Check that we are not over-running input length */
1627 if (keylen < exp_offset + exp_len + 1) {
1628 return "RSA key content shorter than expected";
1630 mod_offset = exp_offset + exp_len;
1631 nettle_rsa_public_key_init(&pubkey);
1632 pubkey.size = keylen - mod_offset;
1633 nettle_mpz_set_str_256_u(pubkey.e, exp_len, &key[exp_offset]);
1634 nettle_mpz_set_str_256_u(pubkey.n, pubkey.size, &key[mod_offset]);
1636 /* Digest content of "buf" and verify its RSA signature in "sigblock"*/
1637 nettle_mpz_init_set_str_256_u(signature, sigblock_len, (uint8_t*)sigblock);
1638 switch (digest_size) {
1639 case SHA1_DIGEST_SIZE:
1641 uint8_t digest[SHA1_DIGEST_SIZE];
1642 res = _digest_nettle(SHA1_DIGEST_SIZE, (unsigned char*)sldns_buffer_begin(buf),
1643 (unsigned int)sldns_buffer_limit(buf), (unsigned char*)digest);
1644 res &= rsa_sha1_verify_digest(&pubkey, digest, signature);
1647 case SHA256_DIGEST_SIZE:
1649 uint8_t digest[SHA256_DIGEST_SIZE];
1650 res = _digest_nettle(SHA256_DIGEST_SIZE, (unsigned char*)sldns_buffer_begin(buf),
1651 (unsigned int)sldns_buffer_limit(buf), (unsigned char*)digest);
1652 res &= rsa_sha256_verify_digest(&pubkey, digest, signature);
1655 case SHA512_DIGEST_SIZE:
1657 uint8_t digest[SHA512_DIGEST_SIZE];
1658 res = _digest_nettle(SHA512_DIGEST_SIZE, (unsigned char*)sldns_buffer_begin(buf),
1659 (unsigned int)sldns_buffer_limit(buf), (unsigned char*)digest);
1660 res &= rsa_sha512_verify_digest(&pubkey, digest, signature);
1667 /* Clear and return */
1668 nettle_rsa_public_key_clear(&pubkey);
1669 mpz_clear(signature);
1671 return "RSA signature verification failed";
1679 _verify_nettle_ecdsa(sldns_buffer* buf, unsigned int digest_size, unsigned char* sigblock,
1680 unsigned int sigblock_len, unsigned char* key, unsigned int keylen)
1683 struct ecc_point pubkey;
1684 struct dsa_signature signature;
1686 /* Always matched strength, as per RFC 6605 sec. 1 */
1687 if (sigblock_len != 2*digest_size || keylen != 2*digest_size) {
1688 return "wrong ECDSA signature length";
1691 /* Parse ECDSA signature as per RFC 6605 sec. 4 */
1692 nettle_dsa_signature_init(&signature);
1693 switch (digest_size) {
1694 case SHA256_DIGEST_SIZE:
1696 uint8_t digest[SHA256_DIGEST_SIZE];
1698 nettle_ecc_point_init(&pubkey, &nettle_secp_256r1);
1699 nettle_mpz_init_set_str_256_u(x, SHA256_DIGEST_SIZE, key);
1700 nettle_mpz_init_set_str_256_u(y, SHA256_DIGEST_SIZE, key+SHA256_DIGEST_SIZE);
1701 nettle_mpz_set_str_256_u(signature.r, SHA256_DIGEST_SIZE, sigblock);
1702 nettle_mpz_set_str_256_u(signature.s, SHA256_DIGEST_SIZE, sigblock+SHA256_DIGEST_SIZE);
1703 res = _digest_nettle(SHA256_DIGEST_SIZE, (unsigned char*)sldns_buffer_begin(buf),
1704 (unsigned int)sldns_buffer_limit(buf), (unsigned char*)digest);
1705 res &= nettle_ecc_point_set(&pubkey, x, y);
1706 res &= nettle_ecdsa_verify (&pubkey, SHA256_DIGEST_SIZE, digest, &signature);
1711 case SHA384_DIGEST_SIZE:
1713 uint8_t digest[SHA384_DIGEST_SIZE];
1715 nettle_ecc_point_init(&pubkey, &nettle_secp_384r1);
1716 nettle_mpz_init_set_str_256_u(x, SHA384_DIGEST_SIZE, key);
1717 nettle_mpz_init_set_str_256_u(y, SHA384_DIGEST_SIZE, key+SHA384_DIGEST_SIZE);
1718 nettle_mpz_set_str_256_u(signature.r, SHA384_DIGEST_SIZE, sigblock);
1719 nettle_mpz_set_str_256_u(signature.s, SHA384_DIGEST_SIZE, sigblock+SHA384_DIGEST_SIZE);
1720 res = _digest_nettle(SHA384_DIGEST_SIZE, (unsigned char*)sldns_buffer_begin(buf),
1721 (unsigned int)sldns_buffer_limit(buf), (unsigned char*)digest);
1722 res &= nettle_ecc_point_set(&pubkey, x, y);
1723 res &= nettle_ecdsa_verify (&pubkey, SHA384_DIGEST_SIZE, digest, &signature);
1726 nettle_ecc_point_clear(&pubkey);
1730 return "unknown ECDSA algorithm";
1733 /* Clear and return */
1734 nettle_dsa_signature_clear(&signature);
1736 return "ECDSA signature verification failed";
1744 _verify_nettle_ed25519(sldns_buffer* buf, unsigned char* sigblock,
1745 unsigned int sigblock_len, unsigned char* key, unsigned int keylen)
1749 if(sigblock_len != ED25519_SIGNATURE_SIZE) {
1750 return "wrong ED25519 signature length";
1752 if(keylen != ED25519_KEY_SIZE) {
1753 return "wrong ED25519 key length";
1756 res = ed25519_sha512_verify((uint8_t*)key, sldns_buffer_limit(buf),
1757 sldns_buffer_begin(buf), (uint8_t*)sigblock);
1760 return "ED25519 signature verification failed";
1767 * Check a canonical sig+rrset and signature against a dnskey
1768 * @param buf: buffer with data to verify, the first rrsig part and the
1769 * canonicalized rrset.
1770 * @param algo: DNSKEY algorithm.
1771 * @param sigblock: signature rdata field from RRSIG
1772 * @param sigblock_len: length of sigblock data.
1773 * @param key: public key data from DNSKEY RR.
1774 * @param keylen: length of keydata.
1775 * @param reason: bogus reason in more detail.
1776 * @return secure if verification succeeded, bogus on crypto failure,
1777 * unchecked on format errors and alloc failures.
1780 verify_canonrrset(sldns_buffer* buf, int algo, unsigned char* sigblock,
1781 unsigned int sigblock_len, unsigned char* key, unsigned int keylen,
1784 unsigned int digest_size = 0;
1786 if (sigblock_len == 0 || keylen == 0) {
1787 *reason = "null signature";
1788 return sec_status_bogus;
1792 #if defined(USE_DSA) && defined(USE_SHA1)
1794 case LDNS_DSA_NSEC3:
1795 *reason = _verify_nettle_dsa(buf, sigblock, sigblock_len, key, keylen);
1796 if (*reason != NULL)
1797 return sec_status_bogus;
1799 return sec_status_secure;
1800 #endif /* USE_DSA */
1804 case LDNS_RSASHA1_NSEC3:
1805 digest_size = (digest_size ? digest_size : SHA1_DIGEST_SIZE);
1807 /* double fallthrough annotation to please gcc parser */
1811 case LDNS_RSASHA256:
1812 digest_size = (digest_size ? digest_size : SHA256_DIGEST_SIZE);
1814 case LDNS_RSASHA512:
1815 digest_size = (digest_size ? digest_size : SHA512_DIGEST_SIZE);
1818 *reason = _verify_nettle_rsa(buf, digest_size, (char*)sigblock,
1819 sigblock_len, key, keylen);
1820 if (*reason != NULL)
1821 return sec_status_bogus;
1823 return sec_status_secure;
1826 case LDNS_ECDSAP256SHA256:
1827 digest_size = (digest_size ? digest_size : SHA256_DIGEST_SIZE);
1829 case LDNS_ECDSAP384SHA384:
1830 digest_size = (digest_size ? digest_size : SHA384_DIGEST_SIZE);
1831 *reason = _verify_nettle_ecdsa(buf, digest_size, sigblock,
1832 sigblock_len, key, keylen);
1833 if (*reason != NULL)
1834 return sec_status_bogus;
1836 return sec_status_secure;
1840 *reason = _verify_nettle_ed25519(buf, sigblock, sigblock_len,
1842 if (*reason != NULL)
1843 return sec_status_bogus;
1845 return sec_status_secure;
1850 *reason = "unable to verify signature, unknown algorithm";
1851 return sec_status_bogus;
1855 #endif /* HAVE_SSL or HAVE_NSS or HAVE_NETTLE */