1 /*
2 * Copyright 2006-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/evp.h>
13 #include <openssl/objects.h>
14 #include "crypto/evp.h"
15 #include "internal/provider.h"
16 #include "internal/numbers.h" /* includes SIZE_MAX */
17 #include "evp_local.h"
18
19 #ifndef FIPS_MODULE
update(EVP_MD_CTX * ctx,const void * data,size_t datalen)20 static int update(EVP_MD_CTX *ctx, const void *data, size_t datalen)
21 {
22 ERR_raise(ERR_LIB_EVP, EVP_R_ONLY_ONESHOT_SUPPORTED);
23 return 0;
24 }
25 #endif
26
27 /*
28 * If we get the "NULL" md then the name comes back as "UNDEF". We want to use
29 * NULL for this.
30 */
canon_mdname(const char * mdname)31 static const char *canon_mdname(const char *mdname)
32 {
33 if (mdname != NULL && strcmp(mdname, "UNDEF") == 0)
34 return NULL;
35
36 return mdname;
37 }
38
do_sigver_init(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,const char * mdname,OSSL_LIB_CTX * libctx,const char * props,ENGINE * e,EVP_PKEY * pkey,int ver,const OSSL_PARAM params[])39 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
40 const EVP_MD *type, const char *mdname,
41 OSSL_LIB_CTX *libctx, const char *props,
42 ENGINE *e, EVP_PKEY *pkey, int ver,
43 const OSSL_PARAM params[])
44 {
45 EVP_PKEY_CTX *locpctx = NULL;
46 EVP_SIGNATURE *signature = NULL;
47 EVP_KEYMGMT *tmp_keymgmt = NULL;
48 const OSSL_PROVIDER *tmp_prov = NULL;
49 const char *supported_sig = NULL;
50 char locmdname[80] = ""; /* 80 chars should be enough */
51 void *provkey = NULL;
52 int ret, iter, reinit = 1;
53
54 if (!evp_md_ctx_free_algctx(ctx))
55 return 0;
56
57 if (ctx->pctx == NULL) {
58 reinit = 0;
59 if (e == NULL)
60 ctx->pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, props);
61 #ifndef FIPS_MODULE
62 else
63 ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
64 #endif
65 }
66 if (ctx->pctx == NULL)
67 return 0;
68
69 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_FINALISED);
70
71 locpctx = ctx->pctx;
72 ERR_set_mark();
73
74 if (evp_pkey_ctx_is_legacy(locpctx))
75 goto legacy;
76
77 /* do not reinitialize if pkey is set or operation is different */
78 if (reinit
79 && (pkey != NULL
80 || locpctx->operation != (ver ? EVP_PKEY_OP_VERIFYCTX
81 : EVP_PKEY_OP_SIGNCTX)
82 || (signature = locpctx->op.sig.signature) == NULL
83 || locpctx->op.sig.algctx == NULL))
84 reinit = 0;
85
86 if (props == NULL)
87 props = locpctx->propquery;
88
89 if (locpctx->pkey == NULL) {
90 ERR_clear_last_mark();
91 ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEY_SET);
92 goto err;
93 }
94
95 if (!reinit) {
96 evp_pkey_ctx_free_old_ops(locpctx);
97 } else {
98 if (mdname == NULL && type == NULL)
99 mdname = canon_mdname(EVP_MD_get0_name(ctx->reqdigest));
100 goto reinitialize;
101 }
102
103 /*
104 * Try to derive the supported signature from |locpctx->keymgmt|.
105 */
106 if (!ossl_assert(locpctx->pkey->keymgmt == NULL
107 || locpctx->pkey->keymgmt == locpctx->keymgmt)) {
108 ERR_clear_last_mark();
109 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
110 goto err;
111 }
112 supported_sig = evp_keymgmt_util_query_operation_name(locpctx->keymgmt,
113 OSSL_OP_SIGNATURE);
114 if (supported_sig == NULL) {
115 ERR_clear_last_mark();
116 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
117 goto err;
118 }
119
120 /*
121 * We perform two iterations:
122 *
123 * 1. Do the normal signature fetch, using the fetching data given by
124 * the EVP_PKEY_CTX.
125 * 2. Do the provider specific signature fetch, from the same provider
126 * as |ctx->keymgmt|
127 *
128 * We then try to fetch the keymgmt from the same provider as the
129 * signature, and try to export |ctx->pkey| to that keymgmt (when
130 * this keymgmt happens to be the same as |ctx->keymgmt|, the export
131 * is a no-op, but we call it anyway to not complicate the code even
132 * more).
133 * If the export call succeeds (returns a non-NULL provider key pointer),
134 * we're done and can perform the operation itself. If not, we perform
135 * the second iteration, or jump to legacy.
136 */
137 for (iter = 1, provkey = NULL; iter < 3 && provkey == NULL; iter++) {
138 EVP_KEYMGMT *tmp_keymgmt_tofree = NULL;
139
140 /*
141 * If we're on the second iteration, free the results from the first.
142 * They are NULL on the first iteration, so no need to check what
143 * iteration we're on.
144 */
145 EVP_SIGNATURE_free(signature);
146 EVP_KEYMGMT_free(tmp_keymgmt);
147
148 switch (iter) {
149 case 1:
150 signature = EVP_SIGNATURE_fetch(locpctx->libctx, supported_sig,
151 locpctx->propquery);
152 if (signature != NULL)
153 tmp_prov = EVP_SIGNATURE_get0_provider(signature);
154 break;
155 case 2:
156 tmp_prov = EVP_KEYMGMT_get0_provider(locpctx->keymgmt);
157 signature =
158 evp_signature_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
159 supported_sig, locpctx->propquery);
160 if (signature == NULL)
161 goto legacy;
162 break;
163 }
164 if (signature == NULL)
165 continue;
166
167 /*
168 * Ensure that the key is provided, either natively, or as a cached
169 * export. We start by fetching the keymgmt with the same name as
170 * |locpctx->pkey|, but from the provider of the signature method, using
171 * the same property query as when fetching the signature method.
172 * With the keymgmt we found (if we did), we try to export |locpctx->pkey|
173 * to it (evp_pkey_export_to_provider() is smart enough to only actually
174
175 * export it if |tmp_keymgmt| is different from |locpctx->pkey|'s keymgmt)
176 */
177 tmp_keymgmt_tofree = tmp_keymgmt =
178 evp_keymgmt_fetch_from_prov((OSSL_PROVIDER *)tmp_prov,
179 EVP_KEYMGMT_get0_name(locpctx->keymgmt),
180 locpctx->propquery);
181 if (tmp_keymgmt != NULL)
182 provkey = evp_pkey_export_to_provider(locpctx->pkey, locpctx->libctx,
183 &tmp_keymgmt, locpctx->propquery);
184 if (tmp_keymgmt == NULL)
185 EVP_KEYMGMT_free(tmp_keymgmt_tofree);
186 }
187
188 if (provkey == NULL) {
189 EVP_SIGNATURE_free(signature);
190 ERR_clear_last_mark();
191 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
192 goto err;
193 }
194
195 ERR_pop_to_mark();
196
197 /* No more legacy from here down to legacy: */
198
199 locpctx->op.sig.signature = signature;
200 locpctx->operation = ver ? EVP_PKEY_OP_VERIFYCTX
201 : EVP_PKEY_OP_SIGNCTX;
202 locpctx->op.sig.algctx
203 = signature->newctx(ossl_provider_ctx(signature->prov), props);
204 if (locpctx->op.sig.algctx == NULL) {
205 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
206 goto err;
207 }
208
209 reinitialize:
210 if (pctx != NULL)
211 *pctx = locpctx;
212
213 if (type != NULL) {
214 ctx->reqdigest = type;
215 if (mdname == NULL)
216 mdname = canon_mdname(EVP_MD_get0_name(type));
217 } else {
218 if (mdname == NULL && !reinit) {
219 if (evp_keymgmt_util_get_deflt_digest_name(tmp_keymgmt, provkey,
220 locmdname,
221 sizeof(locmdname)) > 0) {
222 mdname = canon_mdname(locmdname);
223 }
224 }
225
226 if (mdname != NULL) {
227 /*
228 * We're about to get a new digest so clear anything associated with
229 * an old digest.
230 */
231 evp_md_ctx_clear_digest(ctx, 1, 0);
232
233 /* legacy code support for engines */
234 ERR_set_mark();
235 /*
236 * This might be requested by a later call to EVP_MD_CTX_get0_md().
237 * In that case the "explicit fetch" rules apply for that
238 * function (as per man pages), i.e. the ref count is not updated
239 * so the EVP_MD should not be used beyond the lifetime of the
240 * EVP_MD_CTX.
241 */
242 ctx->fetched_digest = EVP_MD_fetch(locpctx->libctx, mdname, props);
243 if (ctx->fetched_digest != NULL) {
244 ctx->digest = ctx->reqdigest = ctx->fetched_digest;
245 } else {
246 #ifdef FIPS_MODULE
247 (void)ERR_clear_last_mark();
248 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
249 goto err;
250 #else
251 /* legacy engine support : remove the mark when this is deleted */
252 ctx->reqdigest = ctx->digest = EVP_get_digestbyname(mdname);
253 if (ctx->digest == NULL) {
254 (void)ERR_clear_last_mark();
255 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
256 goto err;
257 }
258 #endif
259 }
260 (void)ERR_pop_to_mark();
261 }
262 }
263
264 if (ver) {
265 if (signature->digest_verify_init == NULL) {
266 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
267 goto err;
268 }
269 ret = signature->digest_verify_init(locpctx->op.sig.algctx,
270 mdname, provkey, params);
271 } else {
272 if (signature->digest_sign_init == NULL) {
273 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
274 goto err;
275 }
276 ret = signature->digest_sign_init(locpctx->op.sig.algctx,
277 mdname, provkey, params);
278 }
279
280 /*
281 * If the operation was not a success and no digest was found, an error
282 * needs to be raised.
283 */
284 if (ret > 0 || mdname != NULL)
285 goto end;
286 if (type == NULL) /* This check is redundant but clarifies matters */
287 ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
288
289 err:
290 evp_pkey_ctx_free_old_ops(locpctx);
291 locpctx->operation = EVP_PKEY_OP_UNDEFINED;
292 EVP_KEYMGMT_free(tmp_keymgmt);
293 return 0;
294
295 legacy:
296 /*
297 * If we don't have the full support we need with provided methods,
298 * let's go see if legacy does.
299 */
300 ERR_pop_to_mark();
301 EVP_KEYMGMT_free(tmp_keymgmt);
302 tmp_keymgmt = NULL;
303
304 #ifdef FIPS_MODULE
305 return 0;
306 #else
307 if (type == NULL && mdname != NULL)
308 type = evp_get_digestbyname_ex(locpctx->libctx, mdname);
309
310 if (ctx->pctx->pmeth == NULL) {
311 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
312 return 0;
313 }
314
315 if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
316
317 if (type == NULL) {
318 int def_nid;
319 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
320 type = EVP_get_digestbynid(def_nid);
321 }
322
323 if (type == NULL) {
324 ERR_raise(ERR_LIB_EVP, EVP_R_NO_DEFAULT_DIGEST);
325 return 0;
326 }
327 }
328
329 if (ver) {
330 if (ctx->pctx->pmeth->verifyctx_init) {
331 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
332 return 0;
333 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
334 } else if (ctx->pctx->pmeth->digestverify != 0) {
335 ctx->pctx->operation = EVP_PKEY_OP_VERIFY;
336 ctx->update = update;
337 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) {
338 return 0;
339 }
340 } else {
341 if (ctx->pctx->pmeth->signctx_init) {
342 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
343 return 0;
344 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
345 } else if (ctx->pctx->pmeth->digestsign != 0) {
346 ctx->pctx->operation = EVP_PKEY_OP_SIGN;
347 ctx->update = update;
348 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) {
349 return 0;
350 }
351 }
352 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
353 return 0;
354 if (pctx)
355 *pctx = ctx->pctx;
356 if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
357 return 1;
358 if (!EVP_DigestInit_ex(ctx, type, e))
359 return 0;
360 /*
361 * This indicates the current algorithm requires
362 * special treatment before hashing the tbs-message.
363 */
364 ctx->pctx->flag_call_digest_custom = 0;
365 if (ctx->pctx->pmeth->digest_custom != NULL)
366 ctx->pctx->flag_call_digest_custom = 1;
367
368 ret = 1;
369 #endif
370 end:
371 #ifndef FIPS_MODULE
372 if (ret > 0)
373 ret = evp_pkey_ctx_use_cached_data(locpctx);
374 #endif
375
376 EVP_KEYMGMT_free(tmp_keymgmt);
377 return ret > 0 ? 1 : 0;
378 }
379
EVP_DigestSignInit_ex(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const char * mdname,OSSL_LIB_CTX * libctx,const char * props,EVP_PKEY * pkey,const OSSL_PARAM params[])380 int EVP_DigestSignInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
381 const char *mdname, OSSL_LIB_CTX *libctx,
382 const char *props, EVP_PKEY *pkey,
383 const OSSL_PARAM params[])
384 {
385 return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 0,
386 params);
387 }
388
389 #ifndef FIPS_MODULE
EVP_DigestSignInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)390 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
391 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
392 {
393 return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 0,
394 NULL);
395 }
396 #endif
397
EVP_DigestVerifyInit_ex(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const char * mdname,OSSL_LIB_CTX * libctx,const char * props,EVP_PKEY * pkey,const OSSL_PARAM params[])398 int EVP_DigestVerifyInit_ex(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
399 const char *mdname, OSSL_LIB_CTX *libctx,
400 const char *props, EVP_PKEY *pkey,
401 const OSSL_PARAM params[])
402 {
403 return do_sigver_init(ctx, pctx, NULL, mdname, libctx, props, NULL, pkey, 1,
404 params);
405 }
406
407 #ifndef FIPS_MODULE
EVP_DigestVerifyInit(EVP_MD_CTX * ctx,EVP_PKEY_CTX ** pctx,const EVP_MD * type,ENGINE * e,EVP_PKEY * pkey)408 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
409 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
410 {
411 return do_sigver_init(ctx, pctx, type, NULL, NULL, NULL, e, pkey, 1,
412 NULL);
413 }
414 #endif /* FIPS_MODULE */
415
EVP_DigestSignUpdate(EVP_MD_CTX * ctx,const void * data,size_t dsize)416 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
417 {
418 EVP_PKEY_CTX *pctx = ctx->pctx;
419
420 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
421 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
422 return 0;
423 }
424
425 if (pctx == NULL
426 || pctx->operation != EVP_PKEY_OP_SIGNCTX
427 || pctx->op.sig.algctx == NULL
428 || pctx->op.sig.signature == NULL)
429 goto legacy;
430
431 if (pctx->op.sig.signature->digest_sign_update == NULL) {
432 ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
433 return 0;
434 }
435
436 return pctx->op.sig.signature->digest_sign_update(pctx->op.sig.algctx,
437 data, dsize);
438
439 legacy:
440 #ifdef FIPS_MODULE
441 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
442 return 0;
443 #else
444 if (pctx != NULL) {
445 /* do_sigver_init() checked that |digest_custom| is non-NULL */
446 if (pctx->flag_call_digest_custom
447 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
448 return 0;
449 pctx->flag_call_digest_custom = 0;
450 }
451
452 return EVP_DigestUpdate(ctx, data, dsize);
453 #endif
454 }
455
EVP_DigestVerifyUpdate(EVP_MD_CTX * ctx,const void * data,size_t dsize)456 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t dsize)
457 {
458 EVP_PKEY_CTX *pctx = ctx->pctx;
459
460 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
461 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
462 return 0;
463 }
464
465 if (pctx == NULL
466 || pctx->operation != EVP_PKEY_OP_VERIFYCTX
467 || pctx->op.sig.algctx == NULL
468 || pctx->op.sig.signature == NULL)
469 goto legacy;
470
471 if (pctx->op.sig.signature->digest_verify_update == NULL) {
472 ERR_raise(ERR_LIB_EVP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
473 return 0;
474 }
475
476 return pctx->op.sig.signature->digest_verify_update(pctx->op.sig.algctx,
477 data, dsize);
478
479 legacy:
480 #ifdef FIPS_MODULE
481 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
482 return 0;
483 #else
484 if (pctx != NULL) {
485 /* do_sigver_init() checked that |digest_custom| is non-NULL */
486 if (pctx->flag_call_digest_custom
487 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
488 return 0;
489 pctx->flag_call_digest_custom = 0;
490 }
491
492 return EVP_DigestUpdate(ctx, data, dsize);
493 #endif
494 }
495
EVP_DigestSignFinal(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen)496 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
497 size_t *siglen)
498 {
499 #ifndef FIPS_MODULE
500 int sctx = 0;
501 #endif
502 int r = 0;
503 EVP_PKEY_CTX *dctx = NULL, *pctx = ctx->pctx;
504
505 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
506 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
507 return 0;
508 }
509
510 if (pctx == NULL
511 || pctx->operation != EVP_PKEY_OP_SIGNCTX
512 || pctx->op.sig.algctx == NULL
513 || pctx->op.sig.signature == NULL)
514 goto legacy;
515
516 #ifndef FIPS_MODULE
517 if (sigret != NULL && (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) == 0) {
518 /* try dup */
519 dctx = EVP_PKEY_CTX_dup(pctx);
520 if (dctx != NULL)
521 pctx = dctx;
522 }
523 #endif
524 r = pctx->op.sig.signature->digest_sign_final(pctx->op.sig.algctx,
525 sigret, siglen,
526 sigret == NULL ? 0 : *siglen);
527 if (dctx == NULL && sigret != NULL)
528 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
529 else
530 EVP_PKEY_CTX_free(dctx);
531 return r;
532
533 legacy:
534 #ifdef FIPS_MODULE
535 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
536 return 0;
537 #else
538 if (pctx == NULL || pctx->pmeth == NULL) {
539 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
540 return 0;
541 }
542
543 /* do_sigver_init() checked that |digest_custom| is non-NULL */
544 if (pctx->flag_call_digest_custom
545 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
546 return 0;
547 pctx->flag_call_digest_custom = 0;
548
549 if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
550 if (sigret == NULL)
551 return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
552 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISE) != 0) {
553 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
554 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
555 } else {
556 dctx = EVP_PKEY_CTX_dup(pctx);
557 if (dctx == NULL)
558 return 0;
559 r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
560 EVP_PKEY_CTX_free(dctx);
561 }
562 return r;
563 }
564 if (pctx->pmeth->signctx != NULL)
565 sctx = 1;
566 else
567 sctx = 0;
568 if (sigret != NULL) {
569 unsigned char md[EVP_MAX_MD_SIZE];
570 unsigned int mdlen = 0;
571
572 if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
573 if (sctx)
574 r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
575 else
576 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
577 } else {
578 EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
579
580 if (tmp_ctx == NULL)
581 return 0;
582 if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
583 EVP_MD_CTX_free(tmp_ctx);
584 return 0;
585 }
586 if (sctx)
587 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
588 sigret, siglen, tmp_ctx);
589 else
590 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
591 EVP_MD_CTX_free(tmp_ctx);
592 }
593 if (sctx || !r)
594 return r;
595 if (EVP_PKEY_sign(pctx, sigret, siglen, md, mdlen) <= 0)
596 return 0;
597 } else {
598 if (sctx) {
599 if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
600 return 0;
601 } else {
602 int s = EVP_MD_get_size(ctx->digest);
603
604 if (s <= 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
605 return 0;
606 }
607 }
608 return 1;
609 #endif
610 }
611
EVP_DigestSign(EVP_MD_CTX * ctx,unsigned char * sigret,size_t * siglen,const unsigned char * tbs,size_t tbslen)612 int EVP_DigestSign(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen,
613 const unsigned char *tbs, size_t tbslen)
614 {
615 EVP_PKEY_CTX *pctx = ctx->pctx;
616
617 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
618 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
619 return 0;
620 }
621
622 if (pctx != NULL
623 && pctx->operation == EVP_PKEY_OP_SIGNCTX
624 && pctx->op.sig.algctx != NULL
625 && pctx->op.sig.signature != NULL) {
626 if (pctx->op.sig.signature->digest_sign != NULL) {
627 if (sigret != NULL)
628 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
629 return pctx->op.sig.signature->digest_sign(pctx->op.sig.algctx,
630 sigret, siglen,
631 sigret == NULL ? 0 : *siglen,
632 tbs, tbslen);
633 }
634 #ifdef FIPS_MODULE
635 }
636 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
637 return 0;
638 #else
639 } else {
640 /* legacy */
641 if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestsign != NULL)
642 return ctx->pctx->pmeth->digestsign(ctx, sigret, siglen, tbs, tbslen);
643 }
644
645 if (sigret != NULL && EVP_DigestSignUpdate(ctx, tbs, tbslen) <= 0)
646 return 0;
647 return EVP_DigestSignFinal(ctx, sigret, siglen);
648 #endif
649 }
650
EVP_DigestVerifyFinal(EVP_MD_CTX * ctx,const unsigned char * sig,size_t siglen)651 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
652 size_t siglen)
653 {
654 #ifndef FIPS_MODULE
655 int vctx = 0;
656 unsigned int mdlen = 0;
657 unsigned char md[EVP_MAX_MD_SIZE];
658 #endif
659 int r = 0;
660 EVP_PKEY_CTX *dctx = NULL, *pctx = ctx->pctx;
661
662 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
663 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
664 return 0;
665 }
666
667 if (pctx == NULL
668 || pctx->operation != EVP_PKEY_OP_VERIFYCTX
669 || pctx->op.sig.algctx == NULL
670 || pctx->op.sig.signature == NULL)
671 goto legacy;
672
673 #ifndef FIPS_MODULE
674 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISE) == 0) {
675 /* try dup */
676 dctx = EVP_PKEY_CTX_dup(pctx);
677 if (dctx != NULL)
678 pctx = dctx;
679 }
680 #endif
681 r = pctx->op.sig.signature->digest_verify_final(pctx->op.sig.algctx,
682 sig, siglen);
683 if (dctx == NULL)
684 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
685 else
686 EVP_PKEY_CTX_free(dctx);
687 return r;
688
689 legacy:
690 #ifdef FIPS_MODULE
691 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
692 return 0;
693 #else
694 if (pctx == NULL || pctx->pmeth == NULL) {
695 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
696 return 0;
697 }
698
699 /* do_sigver_init() checked that |digest_custom| is non-NULL */
700 if (pctx->flag_call_digest_custom
701 && !ctx->pctx->pmeth->digest_custom(ctx->pctx, ctx))
702 return 0;
703 pctx->flag_call_digest_custom = 0;
704
705 if (pctx->pmeth->verifyctx != NULL)
706 vctx = 1;
707 else
708 vctx = 0;
709 if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE) {
710 if (vctx) {
711 r = pctx->pmeth->verifyctx(pctx, sig, siglen, ctx);
712 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
713 } else
714 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
715 } else {
716 EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
717 if (tmp_ctx == NULL)
718 return -1;
719 if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
720 EVP_MD_CTX_free(tmp_ctx);
721 return -1;
722 }
723 if (vctx)
724 r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
725 sig, siglen, tmp_ctx);
726 else
727 r = EVP_DigestFinal_ex(tmp_ctx, md, &mdlen);
728 EVP_MD_CTX_free(tmp_ctx);
729 }
730 if (vctx || !r)
731 return r;
732 return EVP_PKEY_verify(pctx, sig, siglen, md, mdlen);
733 #endif
734 }
735
EVP_DigestVerify(EVP_MD_CTX * ctx,const unsigned char * sigret,size_t siglen,const unsigned char * tbs,size_t tbslen)736 int EVP_DigestVerify(EVP_MD_CTX *ctx, const unsigned char *sigret,
737 size_t siglen, const unsigned char *tbs, size_t tbslen)
738 {
739 EVP_PKEY_CTX *pctx = ctx->pctx;
740
741 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
742 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
743 return 0;
744 }
745
746 if (pctx != NULL
747 && pctx->operation == EVP_PKEY_OP_VERIFYCTX
748 && pctx->op.sig.algctx != NULL
749 && pctx->op.sig.signature != NULL) {
750 if (pctx->op.sig.signature->digest_verify != NULL) {
751 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
752 return pctx->op.sig.signature->digest_verify(pctx->op.sig.algctx,
753 sigret, siglen,
754 tbs, tbslen);
755 }
756 #ifdef FIPS_MODULE
757 }
758 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
759 return 0;
760 #else
761 } else {
762 /* legacy */
763 if (ctx->pctx->pmeth != NULL && ctx->pctx->pmeth->digestverify != NULL)
764 return ctx->pctx->pmeth->digestverify(ctx, sigret, siglen, tbs, tbslen);
765 }
766 if (EVP_DigestVerifyUpdate(ctx, tbs, tbslen) <= 0)
767 return -1;
768 return EVP_DigestVerifyFinal(ctx, sigret, siglen);
769 #endif
770 }
771
