1 /* crypto/ts/ts_resp_verify.c */
3 * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
61 #include "internal/cryptlib.h"
62 #include <openssl/objects.h>
63 #include <openssl/ts.h>
64 #include <openssl/pkcs7.h>
66 /* Private function declarations. */
68 static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
69 X509 *signer, STACK_OF(X509) **chain);
70 static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
71 STACK_OF(X509) *chain);
72 static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si);
73 static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert);
74 static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo);
75 static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx,
76 PKCS7 *token, TS_TST_INFO *tst_info);
77 static int ts_check_status_info(TS_RESP *response);
78 static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text);
79 static int ts_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info);
80 static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
82 unsigned char **imprint, unsigned *imprint_len);
83 static int ts_check_imprints(X509_ALGOR *algor_a,
84 unsigned char *imprint_a, unsigned len_a,
85 TS_TST_INFO *tst_info);
86 static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info);
87 static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer);
88 static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names,
92 * Local mapping between response codes and descriptions.
93 * Don't forget to change TS_STATUS_BUF_SIZE when modifying
94 * the elements of this array.
96 static const char *ts_status_text[] = { "granted",
101 "revocationNotification"
104 #define TS_STATUS_TEXT_SIZE OSSL_NELEM(ts_status_text)
107 * This must be greater or equal to the sum of the strings in TS_status_text
108 * plus the number of its elements.
110 #define TS_STATUS_BUF_SIZE 256
115 } ts_failure_info[] = {
116 {TS_INFO_BAD_ALG, "badAlg"},
117 {TS_INFO_BAD_REQUEST, "badRequest"},
118 {TS_INFO_BAD_DATA_FORMAT, "badDataFormat"},
119 {TS_INFO_TIME_NOT_AVAILABLE, "timeNotAvailable"},
120 {TS_INFO_UNACCEPTED_POLICY, "unacceptedPolicy"},
121 {TS_INFO_UNACCEPTED_EXTENSION, "unacceptedExtension"},
122 {TS_INFO_ADD_INFO_NOT_AVAILABLE, "addInfoNotAvailable"},
123 {TS_INFO_SYSTEM_FAILURE, "systemFailure"}
126 #define TS_FAILURE_INFO_SIZE OSSL_NELEM(ts_failure_info)
128 /* Functions for verifying a signed TS_TST_INFO structure. */
131 * This function carries out the following tasks:
132 * - Checks if there is one and only one signer.
133 * - Search for the signing certificate in 'certs' and in the response.
134 * - Check the extended key usage and key usage fields of the signer
135 * certificate (done by the path validation).
136 * - Build and validate the certificate path.
137 * - Check if the certificate path meets the requirements of the
138 * SigningCertificate ESS signed attribute.
139 * - Verify the signature value.
140 * - Returns the signer certificate in 'signer', if 'signer' is not NULL.
142 int TS_RESP_verify_signature(PKCS7 *token, STACK_OF(X509) *certs,
143 X509_STORE *store, X509 **signer_out)
145 STACK_OF(PKCS7_SIGNER_INFO) *sinfos = NULL;
146 PKCS7_SIGNER_INFO *si;
147 STACK_OF(X509) *signers = NULL;
149 STACK_OF(X509) *chain = NULL;
151 int i, j = 0, ret = 0;
154 /* Some sanity checks first. */
156 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_INVALID_NULL_POINTER);
160 /* Check for the correct content type */
161 if (!PKCS7_type_is_signed(token)) {
162 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_WRONG_CONTENT_TYPE);
166 /* Check if there is one and only one signer. */
167 sinfos = PKCS7_get_signer_info(token);
168 if (!sinfos || sk_PKCS7_SIGNER_INFO_num(sinfos) != 1) {
169 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_THERE_MUST_BE_ONE_SIGNER);
172 si = sk_PKCS7_SIGNER_INFO_value(sinfos, 0);
174 /* Check for no content: no data to verify signature. */
175 if (PKCS7_get_detached(token)) {
176 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_NO_CONTENT);
181 * Get hold of the signer certificate, search only internal certificates
182 * if it was requested.
184 signers = PKCS7_get0_signers(token, certs, 0);
185 if (!signers || sk_X509_num(signers) != 1)
187 signer = sk_X509_value(signers, 0);
189 /* Now verify the certificate. */
190 if (!ts_verify_cert(store, certs, signer, &chain))
194 * Check if the signer certificate is consistent with the ESS extension.
196 if (!ts_check_signing_certs(si, chain))
199 /* Creating the message digest. */
200 p7bio = PKCS7_dataInit(token, NULL);
202 /* We now have to 'read' from p7bio to calculate digests etc. */
203 while ((i = BIO_read(p7bio, buf, sizeof(buf))) > 0) ;
205 /* Verifying the signature. */
206 j = PKCS7_signatureVerify(p7bio, token, si, signer);
208 TSerr(TS_F_TS_RESP_VERIFY_SIGNATURE, TS_R_SIGNATURE_FAILURE);
212 /* Return the signer certificate if needed. */
214 *signer_out = signer;
215 CRYPTO_add(&signer->references, 1, CRYPTO_LOCK_X509);
222 sk_X509_pop_free(chain, X509_free);
223 sk_X509_free(signers);
229 * The certificate chain is returned in chain. Caller is responsible for
230 * freeing the vector.
232 static int ts_verify_cert(X509_STORE *store, STACK_OF(X509) *untrusted,
233 X509 *signer, STACK_OF(X509) **chain)
235 X509_STORE_CTX cert_ctx;
239 /* chain is an out argument. */
241 X509_STORE_CTX_init(&cert_ctx, store, signer, untrusted);
242 X509_STORE_CTX_set_purpose(&cert_ctx, X509_PURPOSE_TIMESTAMP_SIGN);
243 i = X509_verify_cert(&cert_ctx);
245 int j = X509_STORE_CTX_get_error(&cert_ctx);
246 TSerr(TS_F_TS_VERIFY_CERT, TS_R_CERTIFICATE_VERIFY_ERROR);
247 ERR_add_error_data(2, "Verify error:",
248 X509_verify_cert_error_string(j));
251 /* Get a copy of the certificate chain. */
252 *chain = X509_STORE_CTX_get1_chain(&cert_ctx);
255 X509_STORE_CTX_cleanup(&cert_ctx);
260 static int ts_check_signing_certs(PKCS7_SIGNER_INFO *si,
261 STACK_OF(X509) *chain)
263 ESS_SIGNING_CERT *ss = ess_get_signing_cert(si);
264 STACK_OF(ESS_CERT_ID) *cert_ids = NULL;
271 cert_ids = ss->cert_ids;
272 /* The signer certificate must be the first in cert_ids. */
273 cert = sk_X509_value(chain, 0);
274 if (ts_find_cert(cert_ids, cert) != 0)
278 * Check the other certificates of the chain if there are more than one
279 * certificate ids in cert_ids.
281 if (sk_ESS_CERT_ID_num(cert_ids) > 1) {
282 /* All the certificates of the chain must be in cert_ids. */
283 for (i = 1; i < sk_X509_num(chain); ++i) {
284 cert = sk_X509_value(chain, i);
285 if (ts_find_cert(cert_ids, cert) < 0)
292 TSerr(TS_F_TS_CHECK_SIGNING_CERTS,
293 TS_R_ESS_SIGNING_CERTIFICATE_ERROR);
294 ESS_SIGNING_CERT_free(ss);
298 static ESS_SIGNING_CERT *ess_get_signing_cert(PKCS7_SIGNER_INFO *si)
301 const unsigned char *p;
302 attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate);
305 p = attr->value.sequence->data;
306 return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length);
309 /* Returns < 0 if certificate is not found, certificate index otherwise. */
310 static int ts_find_cert(STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
314 if (!cert_ids || !cert)
317 /* Recompute SHA1 hash of certificate if necessary (side effect). */
318 X509_check_purpose(cert, -1, 0);
320 /* Look for cert in the cert_ids vector. */
321 for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
322 ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
324 /* Check the SHA-1 hash first. */
325 if (cid->hash->length == sizeof(cert->sha1_hash)
326 && !memcmp(cid->hash->data, cert->sha1_hash,
327 sizeof(cert->sha1_hash))) {
328 /* Check the issuer/serial as well if specified. */
329 ESS_ISSUER_SERIAL *is = cid->issuer_serial;
330 if (!is || !ts_issuer_serial_cmp(is, cert->cert_info))
338 static int ts_issuer_serial_cmp(ESS_ISSUER_SERIAL *is, X509_CINF *cinfo)
340 GENERAL_NAME *issuer;
342 if (!is || !cinfo || sk_GENERAL_NAME_num(is->issuer) != 1)
345 /* Check the issuer first. It must be a directory name. */
346 issuer = sk_GENERAL_NAME_value(is->issuer, 0);
347 if (issuer->type != GEN_DIRNAME
348 || X509_NAME_cmp(issuer->d.dirn, cinfo->issuer))
351 /* Check the serial number, too. */
352 if (ASN1_INTEGER_cmp(is->serial, cinfo->serialNumber))
359 * Verifies whether 'response' contains a valid response with regards
360 * to the settings of the context:
361 * - Gives an error message if the TS_TST_INFO is not present.
362 * - Calls _TS_RESP_verify_token to verify the token content.
364 int TS_RESP_verify_response(TS_VERIFY_CTX *ctx, TS_RESP *response)
366 PKCS7 *token = TS_RESP_get_token(response);
367 TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);
370 /* Check if we have a successful TS_TST_INFO object in place. */
371 if (!ts_check_status_info(response))
374 /* Check the contents of the time stamp token. */
375 if (!int_ts_RESP_verify_token(ctx, token, tst_info))
384 * Tries to extract a TS_TST_INFO structure from the PKCS7 token and
385 * calls the internal int_TS_RESP_verify_token function for verifying it.
387 int TS_RESP_verify_token(TS_VERIFY_CTX *ctx, PKCS7 *token)
389 TS_TST_INFO *tst_info = PKCS7_to_TS_TST_INFO(token);
392 ret = int_ts_RESP_verify_token(ctx, token, tst_info);
393 TS_TST_INFO_free(tst_info);
399 * Verifies whether the 'token' contains a valid time stamp token
400 * with regards to the settings of the context. Only those checks are
401 * carried out that are specified in the context:
402 * - Verifies the signature of the TS_TST_INFO.
403 * - Checks the version number of the response.
404 * - Check if the requested and returned policies math.
405 * - Check if the message imprints are the same.
406 * - Check if the nonces are the same.
407 * - Check if the TSA name matches the signer.
408 * - Check if the TSA name is the expected TSA.
410 static int int_ts_RESP_verify_token(TS_VERIFY_CTX *ctx,
411 PKCS7 *token, TS_TST_INFO *tst_info)
414 GENERAL_NAME *tsa_name = TS_TST_INFO_get_tsa(tst_info);
415 X509_ALGOR *md_alg = NULL;
416 unsigned char *imprint = NULL;
417 unsigned imprint_len = 0;
420 /* Verify the signature. */
421 if ((ctx->flags & TS_VFY_SIGNATURE)
422 && !TS_RESP_verify_signature(token, ctx->certs, ctx->store, &signer))
425 /* Check version number of response. */
426 if ((ctx->flags & TS_VFY_VERSION)
427 && TS_TST_INFO_get_version(tst_info) != 1) {
428 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_UNSUPPORTED_VERSION);
432 /* Check policies. */
433 if ((ctx->flags & TS_VFY_POLICY)
434 && !ts_check_policy(ctx->policy, tst_info))
437 /* Check message imprints. */
438 if ((ctx->flags & TS_VFY_IMPRINT)
439 && !ts_check_imprints(ctx->md_alg, ctx->imprint, ctx->imprint_len,
443 /* Compute and check message imprints. */
444 if ((ctx->flags & TS_VFY_DATA)
445 && (!ts_compute_imprint(ctx->data, tst_info,
446 &md_alg, &imprint, &imprint_len)
447 || !ts_check_imprints(md_alg, imprint, imprint_len, tst_info)))
451 if ((ctx->flags & TS_VFY_NONCE)
452 && !ts_check_nonces(ctx->nonce, tst_info))
455 /* Check whether TSA name and signer certificate match. */
456 if ((ctx->flags & TS_VFY_SIGNER)
457 && tsa_name && !ts_check_signer_name(tsa_name, signer)) {
458 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_NAME_MISMATCH);
462 /* Check whether the TSA is the expected one. */
463 if ((ctx->flags & TS_VFY_TSA_NAME)
464 && !ts_check_signer_name(ctx->tsa_name, signer)) {
465 TSerr(TS_F_INT_TS_RESP_VERIFY_TOKEN, TS_R_TSA_UNTRUSTED);
472 X509_ALGOR_free(md_alg);
473 OPENSSL_free(imprint);
477 static int ts_check_status_info(TS_RESP *response)
479 TS_STATUS_INFO *info = TS_RESP_get_status_info(response);
480 long status = ASN1_INTEGER_get(info->status);
481 const char *status_text = NULL;
482 char *embedded_status_text = NULL;
483 char failure_text[TS_STATUS_BUF_SIZE] = "";
485 /* Check if everything went fine. */
486 if (status == 0 || status == 1)
489 /* There was an error, get the description in status_text. */
490 if (0 <= status && status < (long)TS_STATUS_TEXT_SIZE)
491 status_text = ts_status_text[status];
493 status_text = "unknown code";
495 /* Set the embedded_status_text to the returned description. */
496 if (sk_ASN1_UTF8STRING_num(info->text) > 0
497 && (embedded_status_text = ts_get_status_text(info->text)) == NULL)
500 /* Filling in failure_text with the failure information. */
501 if (info->failure_info) {
504 for (i = 0; i < (int)TS_FAILURE_INFO_SIZE; ++i) {
505 if (ASN1_BIT_STRING_get_bit(info->failure_info,
506 ts_failure_info[i].code)) {
508 strcpy(failure_text, ",");
511 strcat(failure_text, ts_failure_info[i].text);
515 if (failure_text[0] == '\0')
516 strcpy(failure_text, "unspecified");
518 /* Making up the error string. */
519 TSerr(TS_F_TS_CHECK_STATUS_INFO, TS_R_NO_TIME_STAMP_TOKEN);
520 ERR_add_error_data(6,
521 "status code: ", status_text,
522 ", status text: ", embedded_status_text ?
523 embedded_status_text : "unspecified",
524 ", failure codes: ", failure_text);
525 OPENSSL_free(embedded_status_text);
530 static char *ts_get_status_text(STACK_OF(ASN1_UTF8STRING) *text)
533 unsigned int length = 0;
537 /* Determine length first. */
538 for (i = 0; i < sk_ASN1_UTF8STRING_num(text); ++i) {
539 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
540 length += ASN1_STRING_length(current);
541 length += 1; /* separator character */
543 /* Allocate memory (closing '\0' included). */
544 if ((result = OPENSSL_malloc(length)) == NULL) {
545 TSerr(TS_F_TS_GET_STATUS_TEXT, ERR_R_MALLOC_FAILURE);
548 /* Concatenate the descriptions. */
549 for (i = 0, p = result; i < sk_ASN1_UTF8STRING_num(text); ++i) {
550 ASN1_UTF8STRING *current = sk_ASN1_UTF8STRING_value(text, i);
551 length = ASN1_STRING_length(current);
554 strncpy(p, (const char *)ASN1_STRING_data(current), length);
557 /* We do have space for this, too. */
563 static int ts_check_policy(ASN1_OBJECT *req_oid, TS_TST_INFO *tst_info)
565 ASN1_OBJECT *resp_oid = TS_TST_INFO_get_policy_id(tst_info);
567 if (OBJ_cmp(req_oid, resp_oid) != 0) {
568 TSerr(TS_F_TS_CHECK_POLICY, TS_R_POLICY_MISMATCH);
575 static int ts_compute_imprint(BIO *data, TS_TST_INFO *tst_info,
577 unsigned char **imprint, unsigned *imprint_len)
579 TS_MSG_IMPRINT *msg_imprint = TS_TST_INFO_get_msg_imprint(tst_info);
580 X509_ALGOR *md_alg_resp = TS_MSG_IMPRINT_get_algo(msg_imprint);
583 unsigned char buffer[4096];
589 /* Return the MD algorithm of the response. */
590 if ((*md_alg = X509_ALGOR_dup(md_alg_resp)) == NULL)
593 /* Getting the MD object. */
594 if ((md = EVP_get_digestbyobj((*md_alg)->algorithm)) == NULL) {
595 TSerr(TS_F_TS_COMPUTE_IMPRINT, TS_R_UNSUPPORTED_MD_ALGORITHM);
599 /* Compute message digest. */
600 length = EVP_MD_size(md);
603 *imprint_len = length;
604 if ((*imprint = OPENSSL_malloc(*imprint_len)) == NULL) {
605 TSerr(TS_F_TS_COMPUTE_IMPRINT, ERR_R_MALLOC_FAILURE);
609 if (!EVP_DigestInit(&md_ctx, md))
611 while ((length = BIO_read(data, buffer, sizeof(buffer))) > 0) {
612 if (!EVP_DigestUpdate(&md_ctx, buffer, length))
615 if (!EVP_DigestFinal(&md_ctx, *imprint, NULL))
620 X509_ALGOR_free(*md_alg);
621 OPENSSL_free(*imprint);
627 static int ts_check_imprints(X509_ALGOR *algor_a,
628 unsigned char *imprint_a, unsigned len_a,
629 TS_TST_INFO *tst_info)
631 TS_MSG_IMPRINT *b = TS_TST_INFO_get_msg_imprint(tst_info);
632 X509_ALGOR *algor_b = TS_MSG_IMPRINT_get_algo(b);
635 /* algor_a is optional. */
637 /* Compare algorithm OIDs. */
638 if (OBJ_cmp(algor_a->algorithm, algor_b->algorithm))
641 /* The parameter must be NULL in both. */
642 if ((algor_a->parameter
643 && ASN1_TYPE_get(algor_a->parameter) != V_ASN1_NULL)
644 || (algor_b->parameter
645 && ASN1_TYPE_get(algor_b->parameter) != V_ASN1_NULL))
649 /* Compare octet strings. */
650 ret = len_a == (unsigned)ASN1_STRING_length(b->hashed_msg) &&
651 memcmp(imprint_a, ASN1_STRING_data(b->hashed_msg), len_a) == 0;
654 TSerr(TS_F_TS_CHECK_IMPRINTS, TS_R_MESSAGE_IMPRINT_MISMATCH);
658 static int ts_check_nonces(const ASN1_INTEGER *a, TS_TST_INFO *tst_info)
660 const ASN1_INTEGER *b = TS_TST_INFO_get_nonce(tst_info);
662 /* Error if nonce is missing. */
664 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_NOT_RETURNED);
668 /* No error if a nonce is returned without being requested. */
669 if (ASN1_INTEGER_cmp(a, b) != 0) {
670 TSerr(TS_F_TS_CHECK_NONCES, TS_R_NONCE_MISMATCH);
678 * Check if the specified TSA name matches either the subject or one of the
679 * subject alternative names of the TSA certificate.
681 static int ts_check_signer_name(GENERAL_NAME *tsa_name, X509 *signer)
683 STACK_OF(GENERAL_NAME) *gen_names = NULL;
687 /* Check the subject name first. */
688 if (tsa_name->type == GEN_DIRNAME
689 && X509_name_cmp(tsa_name->d.dirn, signer->cert_info->subject) == 0)
692 /* Check all the alternative names. */
693 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
694 while (gen_names != NULL) {
695 found = ts_find_name(gen_names, tsa_name) >= 0;
699 * Get the next subject alternative name, although there should be no
702 GENERAL_NAMES_free(gen_names);
703 gen_names = X509_get_ext_d2i(signer, NID_subject_alt_name, NULL, &idx);
705 GENERAL_NAMES_free(gen_names);
710 /* Returns 1 if name is in gen_names, 0 otherwise. */
711 static int ts_find_name(STACK_OF(GENERAL_NAME) *gen_names, GENERAL_NAME *name)
714 for (i = 0, found = 0; !found && i < sk_GENERAL_NAME_num(gen_names); ++i) {
715 GENERAL_NAME *current = sk_GENERAL_NAME_value(gen_names, i);
716 found = GENERAL_NAME_cmp(current, name) == 0;
718 return found ? i - 1 : -1;