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