1 /*
2 * Copyright 1995-2023 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 /* We need to use some engine deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
12
13 #include <stdio.h>
14 #include <openssl/objects.h>
15 #include <openssl/evp.h>
16 #include <openssl/ec.h>
17 #ifndef FIPS_MODULE
18 # include <openssl/engine.h>
19 #endif
20 #include <openssl/params.h>
21 #include <openssl/core_names.h>
22 #include "internal/cryptlib.h"
23 #include "internal/provider.h"
24 #include "internal/core.h"
25 #include "crypto/evp.h"
26 #include "evp_local.h"
27
cleanup_old_md_data(EVP_MD_CTX * ctx,int force)28 static void cleanup_old_md_data(EVP_MD_CTX *ctx, int force)
29 {
30 if (ctx->digest != NULL) {
31 if (ctx->digest->cleanup != NULL
32 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
33 ctx->digest->cleanup(ctx);
34 if (ctx->md_data != NULL && ctx->digest->ctx_size > 0
35 && (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)
36 || force)) {
37 OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
38 ctx->md_data = NULL;
39 }
40 }
41 }
42
evp_md_ctx_clear_digest(EVP_MD_CTX * ctx,int force,int keep_fetched)43 void evp_md_ctx_clear_digest(EVP_MD_CTX *ctx, int force, int keep_fetched)
44 {
45 if (ctx->algctx != NULL) {
46 if (ctx->digest != NULL && ctx->digest->freectx != NULL)
47 ctx->digest->freectx(ctx->algctx);
48 ctx->algctx = NULL;
49 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
50 }
51
52 /* Code below to be removed when legacy support is dropped. */
53
54 /*
55 * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
56 * sometimes only copies of the context are ever finalised.
57 */
58 cleanup_old_md_data(ctx, force);
59 if (force)
60 ctx->digest = NULL;
61
62 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
63 ENGINE_finish(ctx->engine);
64 ctx->engine = NULL;
65 #endif
66
67 /* Non legacy code, this has to be later than the ctx->digest cleaning */
68 if (!keep_fetched) {
69 EVP_MD_free(ctx->fetched_digest);
70 ctx->fetched_digest = NULL;
71 ctx->reqdigest = NULL;
72 }
73 }
74
evp_md_ctx_reset_ex(EVP_MD_CTX * ctx,int keep_fetched)75 static int evp_md_ctx_reset_ex(EVP_MD_CTX *ctx, int keep_fetched)
76 {
77 if (ctx == NULL)
78 return 1;
79
80 #ifndef FIPS_MODULE
81 /*
82 * pctx should be freed by the user of EVP_MD_CTX
83 * if EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set
84 */
85 if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) {
86 EVP_PKEY_CTX_free(ctx->pctx);
87 ctx->pctx = NULL;
88 }
89 #endif
90
91 evp_md_ctx_clear_digest(ctx, 0, keep_fetched);
92 if (!keep_fetched)
93 OPENSSL_cleanse(ctx, sizeof(*ctx));
94
95 return 1;
96 }
97
98 /* This call frees resources associated with the context */
EVP_MD_CTX_reset(EVP_MD_CTX * ctx)99 int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
100 {
101 return evp_md_ctx_reset_ex(ctx, 0);
102 }
103
104 #ifndef FIPS_MODULE
evp_md_ctx_new_ex(EVP_PKEY * pkey,const ASN1_OCTET_STRING * id,OSSL_LIB_CTX * libctx,const char * propq)105 EVP_MD_CTX *evp_md_ctx_new_ex(EVP_PKEY *pkey, const ASN1_OCTET_STRING *id,
106 OSSL_LIB_CTX *libctx, const char *propq)
107 {
108 EVP_MD_CTX *ctx;
109 EVP_PKEY_CTX *pctx = NULL;
110
111 if ((ctx = EVP_MD_CTX_new()) == NULL
112 || (pctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq)) == NULL) {
113 ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
114 goto err;
115 }
116
117 if (id != NULL && EVP_PKEY_CTX_set1_id(pctx, id->data, id->length) <= 0)
118 goto err;
119
120 EVP_MD_CTX_set_pkey_ctx(ctx, pctx);
121 return ctx;
122
123 err:
124 EVP_PKEY_CTX_free(pctx);
125 EVP_MD_CTX_free(ctx);
126 return NULL;
127 }
128 #endif
129
EVP_MD_CTX_new(void)130 EVP_MD_CTX *EVP_MD_CTX_new(void)
131 {
132 return OPENSSL_zalloc(sizeof(EVP_MD_CTX));
133 }
134
EVP_MD_CTX_free(EVP_MD_CTX * ctx)135 void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
136 {
137 if (ctx == NULL)
138 return;
139
140 EVP_MD_CTX_reset(ctx);
141 OPENSSL_free(ctx);
142 }
143
evp_md_ctx_free_algctx(EVP_MD_CTX * ctx)144 int evp_md_ctx_free_algctx(EVP_MD_CTX *ctx)
145 {
146 if (ctx->algctx != NULL) {
147 if (!ossl_assert(ctx->digest != NULL)) {
148 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
149 return 0;
150 }
151 if (ctx->digest->freectx != NULL)
152 ctx->digest->freectx(ctx->algctx);
153 ctx->algctx = NULL;
154 }
155 return 1;
156 }
157
evp_md_init_internal(EVP_MD_CTX * ctx,const EVP_MD * type,const OSSL_PARAM params[],ENGINE * impl)158 static int evp_md_init_internal(EVP_MD_CTX *ctx, const EVP_MD *type,
159 const OSSL_PARAM params[], ENGINE *impl)
160 {
161 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
162 ENGINE *tmpimpl = NULL;
163 #endif
164
165 #if !defined(FIPS_MODULE)
166 if (ctx->pctx != NULL
167 && EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
168 && ctx->pctx->op.sig.algctx != NULL) {
169 /*
170 * Prior to OpenSSL 3.0 calling EVP_DigestInit_ex() on an mdctx
171 * previously initialised with EVP_DigestSignInit() would retain
172 * information about the key, and re-initialise for another sign
173 * operation. So in that case we redirect to EVP_DigestSignInit()
174 */
175 if (ctx->pctx->operation == EVP_PKEY_OP_SIGNCTX)
176 return EVP_DigestSignInit(ctx, NULL, type, impl, NULL);
177 if (ctx->pctx->operation == EVP_PKEY_OP_VERIFYCTX)
178 return EVP_DigestVerifyInit(ctx, NULL, type, impl, NULL);
179 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
180 return 0;
181 }
182 #endif
183
184 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED
185 | EVP_MD_CTX_FLAG_FINALISED);
186
187 if (type != NULL) {
188 ctx->reqdigest = type;
189 } else {
190 if (ctx->digest == NULL) {
191 ERR_raise(ERR_LIB_EVP, EVP_R_NO_DIGEST_SET);
192 return 0;
193 }
194 type = ctx->digest;
195 }
196
197 /* Code below to be removed when legacy support is dropped. */
198 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
199 /*
200 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
201 * this context may already have an ENGINE! Try to avoid releasing the
202 * previous handle, re-querying for an ENGINE, and having a
203 * reinitialisation, when it may all be unnecessary.
204 */
205 if (ctx->engine != NULL
206 && ctx->digest != NULL
207 && type->type == ctx->digest->type)
208 goto skip_to_init;
209
210 /*
211 * Ensure an ENGINE left lying around from last time is cleared (the
212 * previous check attempted to avoid this if the same ENGINE and
213 * EVP_MD could be used).
214 */
215 ENGINE_finish(ctx->engine);
216 ctx->engine = NULL;
217
218 if (impl == NULL)
219 tmpimpl = ENGINE_get_digest_engine(type->type);
220 #endif
221
222 /*
223 * If there are engines involved or EVP_MD_CTX_FLAG_NO_INIT is set then we
224 * should use legacy handling for now.
225 */
226 if (impl != NULL
227 #if !defined(OPENSSL_NO_ENGINE)
228 || ctx->engine != NULL
229 # if !defined(FIPS_MODULE)
230 || tmpimpl != NULL
231 # endif
232 #endif
233 || (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0
234 || (type != NULL && type->origin == EVP_ORIG_METH)
235 || (type == NULL && ctx->digest != NULL
236 && ctx->digest->origin == EVP_ORIG_METH)) {
237 /* If we were using provided hash before, cleanup algctx */
238 if (!evp_md_ctx_free_algctx(ctx))
239 return 0;
240 if (ctx->digest == ctx->fetched_digest)
241 ctx->digest = NULL;
242 EVP_MD_free(ctx->fetched_digest);
243 ctx->fetched_digest = NULL;
244 goto legacy;
245 }
246
247 cleanup_old_md_data(ctx, 1);
248
249 /* Start of non-legacy code below */
250 if (ctx->digest == type) {
251 if (!ossl_assert(type->prov != NULL)) {
252 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
253 return 0;
254 }
255 } else {
256 if (!evp_md_ctx_free_algctx(ctx))
257 return 0;
258 }
259
260 if (type->prov == NULL) {
261 #ifdef FIPS_MODULE
262 /* We only do explicit fetches inside the FIPS module */
263 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
264 return 0;
265 #else
266 /* The NULL digest is a special case */
267 EVP_MD *provmd = EVP_MD_fetch(NULL,
268 type->type != NID_undef ? OBJ_nid2sn(type->type)
269 : "NULL", "");
270
271 if (provmd == NULL) {
272 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
273 return 0;
274 }
275 type = provmd;
276 EVP_MD_free(ctx->fetched_digest);
277 ctx->fetched_digest = provmd;
278 #endif
279 }
280
281 if (type->prov != NULL && ctx->fetched_digest != type) {
282 if (!EVP_MD_up_ref((EVP_MD *)type)) {
283 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
284 return 0;
285 }
286 EVP_MD_free(ctx->fetched_digest);
287 ctx->fetched_digest = (EVP_MD *)type;
288 }
289 ctx->digest = type;
290 if (ctx->algctx == NULL) {
291 ctx->algctx = ctx->digest->newctx(ossl_provider_ctx(type->prov));
292 if (ctx->algctx == NULL) {
293 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
294 return 0;
295 }
296 }
297
298 if (ctx->digest->dinit == NULL) {
299 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
300 return 0;
301 }
302
303 return ctx->digest->dinit(ctx->algctx, params);
304
305 /* Code below to be removed when legacy support is dropped. */
306 legacy:
307
308 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
309 if (type) {
310 if (impl != NULL) {
311 if (!ENGINE_init(impl)) {
312 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
313 return 0;
314 }
315 } else {
316 /* Ask if an ENGINE is reserved for this job */
317 impl = tmpimpl;
318 }
319 if (impl != NULL) {
320 /* There's an ENGINE for this job ... (apparently) */
321 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
322
323 if (d == NULL) {
324 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
325 ENGINE_finish(impl);
326 return 0;
327 }
328 /* We'll use the ENGINE's private digest definition */
329 type = d;
330 /*
331 * Store the ENGINE functional reference so we know 'type' came
332 * from an ENGINE and we need to release it when done.
333 */
334 ctx->engine = impl;
335 } else
336 ctx->engine = NULL;
337 }
338 #endif
339 if (ctx->digest != type) {
340 cleanup_old_md_data(ctx, 1);
341
342 ctx->digest = type;
343 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
344 ctx->update = type->update;
345 ctx->md_data = OPENSSL_zalloc(type->ctx_size);
346 if (ctx->md_data == NULL)
347 return 0;
348 }
349 }
350 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
351 skip_to_init:
352 #endif
353 #ifndef FIPS_MODULE
354 if (ctx->pctx != NULL
355 && (!EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
356 || ctx->pctx->op.sig.signature == NULL)) {
357 int r;
358 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
359 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
360 if (r <= 0 && (r != -2))
361 return 0;
362 }
363 #endif
364 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
365 return 1;
366 return ctx->digest->init(ctx);
367 }
368
EVP_DigestInit_ex2(EVP_MD_CTX * ctx,const EVP_MD * type,const OSSL_PARAM params[])369 int EVP_DigestInit_ex2(EVP_MD_CTX *ctx, const EVP_MD *type,
370 const OSSL_PARAM params[])
371 {
372 return evp_md_init_internal(ctx, type, params, NULL);
373 }
374
EVP_DigestInit(EVP_MD_CTX * ctx,const EVP_MD * type)375 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
376 {
377 EVP_MD_CTX_reset(ctx);
378 return evp_md_init_internal(ctx, type, NULL, NULL);
379 }
380
EVP_DigestInit_ex(EVP_MD_CTX * ctx,const EVP_MD * type,ENGINE * impl)381 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
382 {
383 return evp_md_init_internal(ctx, type, NULL, impl);
384 }
385
EVP_DigestUpdate(EVP_MD_CTX * ctx,const void * data,size_t count)386 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
387 {
388 if (count == 0)
389 return 1;
390
391 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
392 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
393 return 0;
394 }
395
396 if (ctx->pctx != NULL
397 && EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
398 && ctx->pctx->op.sig.algctx != NULL) {
399 /*
400 * Prior to OpenSSL 3.0 EVP_DigestSignUpdate() and
401 * EVP_DigestVerifyUpdate() were just macros for EVP_DigestUpdate().
402 * Some code calls EVP_DigestUpdate() directly even when initialised
403 * with EVP_DigestSignInit_ex() or
404 * EVP_DigestVerifyInit_ex(), so we detect that and redirect to
405 * the correct EVP_Digest*Update() function
406 */
407 if (ctx->pctx->operation == EVP_PKEY_OP_SIGNCTX)
408 return EVP_DigestSignUpdate(ctx, data, count);
409 if (ctx->pctx->operation == EVP_PKEY_OP_VERIFYCTX)
410 return EVP_DigestVerifyUpdate(ctx, data, count);
411 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
412 return 0;
413 }
414
415 if (ctx->digest == NULL
416 || ctx->digest->prov == NULL
417 || (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0)
418 goto legacy;
419
420 if (ctx->digest->dupdate == NULL) {
421 ERR_raise(ERR_LIB_EVP, EVP_R_UPDATE_ERROR);
422 return 0;
423 }
424 return ctx->digest->dupdate(ctx->algctx, data, count);
425
426 /* Code below to be removed when legacy support is dropped. */
427 legacy:
428 return ctx->update(ctx, data, count);
429 }
430
431 /* The caller can assume that this removes any secret data from the context */
EVP_DigestFinal(EVP_MD_CTX * ctx,unsigned char * md,unsigned int * size)432 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
433 {
434 int ret;
435 ret = EVP_DigestFinal_ex(ctx, md, size);
436 EVP_MD_CTX_reset(ctx);
437 return ret;
438 }
439
440 /* The caller can assume that this removes any secret data from the context */
EVP_DigestFinal_ex(EVP_MD_CTX * ctx,unsigned char * md,unsigned int * isize)441 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *isize)
442 {
443 int ret, sz;
444 size_t size = 0;
445 size_t mdsize = 0;
446
447 if (ctx->digest == NULL)
448 return 0;
449
450 sz = EVP_MD_get_size(ctx->digest);
451 if (sz < 0)
452 return 0;
453 mdsize = sz;
454 if (ctx->digest->prov == NULL)
455 goto legacy;
456
457 if (sz == 0) /* Assuming a xoflen must have been set. */
458 mdsize = SIZE_MAX;
459 if (ctx->digest->gettable_ctx_params != NULL) {
460 OSSL_PARAM params[] = { OSSL_PARAM_END, OSSL_PARAM_END };
461
462 params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_SIZE,
463 &mdsize);
464 if (!EVP_MD_CTX_get_params(ctx, params))
465 return 0;
466 }
467
468 if (ctx->digest->dfinal == NULL) {
469 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
470 return 0;
471 }
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 ret = ctx->digest->dfinal(ctx->algctx, md, &size, mdsize);
479
480 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
481
482 if (isize != NULL) {
483 if (size <= UINT_MAX) {
484 *isize = (unsigned int)size;
485 } else {
486 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
487 ret = 0;
488 }
489 }
490
491 return ret;
492
493 /* Code below to be removed when legacy support is dropped. */
494 legacy:
495 OPENSSL_assert(mdsize <= EVP_MAX_MD_SIZE);
496 ret = ctx->digest->final(ctx, md);
497 if (isize != NULL)
498 *isize = mdsize;
499 if (ctx->digest->cleanup) {
500 ctx->digest->cleanup(ctx);
501 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
502 }
503 OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
504 return ret;
505 }
506
507 /* This is a one shot operation */
EVP_DigestFinalXOF(EVP_MD_CTX * ctx,unsigned char * md,size_t size)508 int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, unsigned char *md, size_t size)
509 {
510 int ret = 0;
511 OSSL_PARAM params[2];
512 size_t i = 0;
513
514 if (ctx->digest == NULL) {
515 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
516 return 0;
517 }
518
519 if (ctx->digest->prov == NULL)
520 goto legacy;
521
522 if (ctx->digest->dfinal == NULL) {
523 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
524 return 0;
525 }
526
527 if ((ctx->flags & EVP_MD_CTX_FLAG_FINALISED) != 0) {
528 ERR_raise(ERR_LIB_EVP, EVP_R_FINAL_ERROR);
529 return 0;
530 }
531
532 /*
533 * For backward compatibility we pass the XOFLEN via a param here so that
534 * older providers can use the supplied value. Ideally we should have just
535 * used the size passed into ctx->digest->dfinal().
536 */
537 params[i++] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &size);
538 params[i++] = OSSL_PARAM_construct_end();
539
540 if (EVP_MD_CTX_set_params(ctx, params) >= 0)
541 ret = ctx->digest->dfinal(ctx->algctx, md, &size, size);
542
543 ctx->flags |= EVP_MD_CTX_FLAG_FINALISED;
544
545 return ret;
546
547 legacy:
548 if (ctx->digest->flags & EVP_MD_FLAG_XOF
549 && size <= INT_MAX
550 && ctx->digest->md_ctrl(ctx, EVP_MD_CTRL_XOF_LEN, (int)size, NULL)) {
551 ret = ctx->digest->final(ctx, md);
552 if (ctx->digest->cleanup != NULL) {
553 ctx->digest->cleanup(ctx);
554 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
555 }
556 OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
557 } else {
558 ERR_raise(ERR_LIB_EVP, EVP_R_NOT_XOF_OR_INVALID_LENGTH);
559 }
560
561 return ret;
562 }
563
564 /* EVP_DigestSqueeze() can be called multiple times */
EVP_DigestSqueeze(EVP_MD_CTX * ctx,unsigned char * md,size_t size)565 int EVP_DigestSqueeze(EVP_MD_CTX *ctx, unsigned char *md, size_t size)
566 {
567 if (ctx->digest == NULL) {
568 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_NULL_ALGORITHM);
569 return 0;
570 }
571
572 if (ctx->digest->prov == NULL) {
573 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_OPERATION);
574 return 0;
575 }
576
577 if (ctx->digest->dsqueeze == NULL) {
578 ERR_raise(ERR_LIB_EVP, EVP_R_METHOD_NOT_SUPPORTED);
579 return 0;
580 }
581
582 return ctx->digest->dsqueeze(ctx->algctx, md, &size, size);
583 }
584
EVP_MD_CTX_dup(const EVP_MD_CTX * in)585 EVP_MD_CTX *EVP_MD_CTX_dup(const EVP_MD_CTX *in)
586 {
587 EVP_MD_CTX *out = EVP_MD_CTX_new();
588
589 if (out != NULL && !EVP_MD_CTX_copy_ex(out, in)) {
590 EVP_MD_CTX_free(out);
591 out = NULL;
592 }
593 return out;
594 }
595
EVP_MD_CTX_copy(EVP_MD_CTX * out,const EVP_MD_CTX * in)596 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
597 {
598 EVP_MD_CTX_reset(out);
599 return EVP_MD_CTX_copy_ex(out, in);
600 }
601
EVP_MD_CTX_copy_ex(EVP_MD_CTX * out,const EVP_MD_CTX * in)602 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
603 {
604 int digest_change = 0;
605 unsigned char *tmp_buf;
606
607 if (in == NULL) {
608 ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
609 return 0;
610 }
611
612 if (in->digest == NULL) {
613 /* copying uninitialized digest context */
614 EVP_MD_CTX_reset(out);
615 if (out->fetched_digest != NULL)
616 EVP_MD_free(out->fetched_digest);
617 *out = *in;
618 goto clone_pkey;
619 }
620
621 if (in->digest->prov == NULL
622 || (in->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0)
623 goto legacy;
624
625 if (in->digest->dupctx == NULL) {
626 ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
627 return 0;
628 }
629
630 evp_md_ctx_reset_ex(out, 1);
631 digest_change = (out->fetched_digest != in->fetched_digest);
632 if (digest_change && out->fetched_digest != NULL)
633 EVP_MD_free(out->fetched_digest);
634 *out = *in;
635 /* NULL out pointers in case of error */
636 out->pctx = NULL;
637 out->algctx = NULL;
638
639 if (digest_change && in->fetched_digest != NULL)
640 EVP_MD_up_ref(in->fetched_digest);
641
642 if (in->algctx != NULL) {
643 out->algctx = in->digest->dupctx(in->algctx);
644 if (out->algctx == NULL) {
645 ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
646 return 0;
647 }
648 }
649
650 clone_pkey:
651 /* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
652 EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
653 #ifndef FIPS_MODULE
654 if (in->pctx != NULL) {
655 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
656 if (out->pctx == NULL) {
657 ERR_raise(ERR_LIB_EVP, EVP_R_NOT_ABLE_TO_COPY_CTX);
658 EVP_MD_CTX_reset(out);
659 return 0;
660 }
661 }
662 #endif
663
664 return 1;
665
666 /* Code below to be removed when legacy support is dropped. */
667 legacy:
668 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
669 /* Make sure it's safe to copy a digest context using an ENGINE */
670 if (in->engine && !ENGINE_init(in->engine)) {
671 ERR_raise(ERR_LIB_EVP, ERR_R_ENGINE_LIB);
672 return 0;
673 }
674 #endif
675
676 if (out->digest == in->digest) {
677 tmp_buf = out->md_data;
678 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
679 } else
680 tmp_buf = NULL;
681 EVP_MD_CTX_reset(out);
682 memcpy(out, in, sizeof(*out));
683
684 /* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
685 EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
686
687 /* Null these variables, since they are getting fixed up
688 * properly below. Anything else may cause a memleak and/or
689 * double free if any of the memory allocations below fail
690 */
691 out->md_data = NULL;
692 out->pctx = NULL;
693
694 if (in->md_data && out->digest->ctx_size) {
695 if (tmp_buf)
696 out->md_data = tmp_buf;
697 else {
698 out->md_data = OPENSSL_malloc(out->digest->ctx_size);
699 if (out->md_data == NULL)
700 return 0;
701 }
702 memcpy(out->md_data, in->md_data, out->digest->ctx_size);
703 }
704
705 out->update = in->update;
706
707 #ifndef FIPS_MODULE
708 if (in->pctx) {
709 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
710 if (!out->pctx) {
711 EVP_MD_CTX_reset(out);
712 return 0;
713 }
714 }
715 #endif
716
717 if (out->digest->copy)
718 return out->digest->copy(out, in);
719
720 return 1;
721 }
722
EVP_Digest(const void * data,size_t count,unsigned char * md,unsigned int * size,const EVP_MD * type,ENGINE * impl)723 int EVP_Digest(const void *data, size_t count,
724 unsigned char *md, unsigned int *size, const EVP_MD *type,
725 ENGINE *impl)
726 {
727 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
728 int ret;
729
730 if (ctx == NULL)
731 return 0;
732 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT);
733 ret = EVP_DigestInit_ex(ctx, type, impl)
734 && EVP_DigestUpdate(ctx, data, count)
735 && EVP_DigestFinal_ex(ctx, md, size);
736 EVP_MD_CTX_free(ctx);
737
738 return ret;
739 }
740
EVP_Q_digest(OSSL_LIB_CTX * libctx,const char * name,const char * propq,const void * data,size_t datalen,unsigned char * md,size_t * mdlen)741 int EVP_Q_digest(OSSL_LIB_CTX *libctx, const char *name, const char *propq,
742 const void *data, size_t datalen,
743 unsigned char *md, size_t *mdlen)
744 {
745 EVP_MD *digest = EVP_MD_fetch(libctx, name, propq);
746 unsigned int temp = 0;
747 int ret = 0;
748
749 if (digest != NULL) {
750 ret = EVP_Digest(data, datalen, md, &temp, digest, NULL);
751 EVP_MD_free(digest);
752 }
753 if (mdlen != NULL)
754 *mdlen = temp;
755 return ret;
756 }
757
EVP_MD_get_params(const EVP_MD * digest,OSSL_PARAM params[])758 int EVP_MD_get_params(const EVP_MD *digest, OSSL_PARAM params[])
759 {
760 if (digest != NULL && digest->get_params != NULL)
761 return digest->get_params(params);
762 return 0;
763 }
764
EVP_MD_gettable_params(const EVP_MD * digest)765 const OSSL_PARAM *EVP_MD_gettable_params(const EVP_MD *digest)
766 {
767 if (digest != NULL && digest->gettable_params != NULL)
768 return digest->gettable_params(
769 ossl_provider_ctx(EVP_MD_get0_provider(digest)));
770 return NULL;
771 }
772
EVP_MD_CTX_set_params(EVP_MD_CTX * ctx,const OSSL_PARAM params[])773 int EVP_MD_CTX_set_params(EVP_MD_CTX *ctx, const OSSL_PARAM params[])
774 {
775 EVP_PKEY_CTX *pctx = ctx->pctx;
776
777 /* If we have a pctx then we should try that first */
778 if (pctx != NULL
779 && (pctx->operation == EVP_PKEY_OP_VERIFYCTX
780 || pctx->operation == EVP_PKEY_OP_SIGNCTX)
781 && pctx->op.sig.algctx != NULL
782 && pctx->op.sig.signature->set_ctx_md_params != NULL)
783 return pctx->op.sig.signature->set_ctx_md_params(pctx->op.sig.algctx,
784 params);
785
786 if (ctx->digest != NULL && ctx->digest->set_ctx_params != NULL)
787 return ctx->digest->set_ctx_params(ctx->algctx, params);
788
789 return 0;
790 }
791
EVP_MD_settable_ctx_params(const EVP_MD * md)792 const OSSL_PARAM *EVP_MD_settable_ctx_params(const EVP_MD *md)
793 {
794 void *provctx;
795
796 if (md != NULL && md->settable_ctx_params != NULL) {
797 provctx = ossl_provider_ctx(EVP_MD_get0_provider(md));
798 return md->settable_ctx_params(NULL, provctx);
799 }
800 return NULL;
801 }
802
EVP_MD_CTX_settable_params(EVP_MD_CTX * ctx)803 const OSSL_PARAM *EVP_MD_CTX_settable_params(EVP_MD_CTX *ctx)
804 {
805 EVP_PKEY_CTX *pctx;
806 void *alg;
807
808 if (ctx == NULL)
809 return NULL;
810
811 /* If we have a pctx then we should try that first */
812 pctx = ctx->pctx;
813 if (pctx != NULL
814 && (pctx->operation == EVP_PKEY_OP_VERIFYCTX
815 || pctx->operation == EVP_PKEY_OP_SIGNCTX)
816 && pctx->op.sig.algctx != NULL
817 && pctx->op.sig.signature->settable_ctx_md_params != NULL)
818 return pctx->op.sig.signature->settable_ctx_md_params(
819 pctx->op.sig.algctx);
820
821 if (ctx->digest != NULL && ctx->digest->settable_ctx_params != NULL) {
822 alg = ossl_provider_ctx(EVP_MD_get0_provider(ctx->digest));
823 return ctx->digest->settable_ctx_params(ctx->algctx, alg);
824 }
825
826 return NULL;
827 }
828
EVP_MD_CTX_get_params(EVP_MD_CTX * ctx,OSSL_PARAM params[])829 int EVP_MD_CTX_get_params(EVP_MD_CTX *ctx, OSSL_PARAM params[])
830 {
831 EVP_PKEY_CTX *pctx = ctx->pctx;
832
833 /* If we have a pctx then we should try that first */
834 if (pctx != NULL
835 && (pctx->operation == EVP_PKEY_OP_VERIFYCTX
836 || pctx->operation == EVP_PKEY_OP_SIGNCTX)
837 && pctx->op.sig.algctx != NULL
838 && pctx->op.sig.signature->get_ctx_md_params != NULL)
839 return pctx->op.sig.signature->get_ctx_md_params(pctx->op.sig.algctx,
840 params);
841
842 if (ctx->digest != NULL && ctx->digest->get_ctx_params != NULL)
843 return ctx->digest->get_ctx_params(ctx->algctx, params);
844
845 return 0;
846 }
847
EVP_MD_gettable_ctx_params(const EVP_MD * md)848 const OSSL_PARAM *EVP_MD_gettable_ctx_params(const EVP_MD *md)
849 {
850 void *provctx;
851
852 if (md != NULL && md->gettable_ctx_params != NULL) {
853 provctx = ossl_provider_ctx(EVP_MD_get0_provider(md));
854 return md->gettable_ctx_params(NULL, provctx);
855 }
856 return NULL;
857 }
858
EVP_MD_CTX_gettable_params(EVP_MD_CTX * ctx)859 const OSSL_PARAM *EVP_MD_CTX_gettable_params(EVP_MD_CTX *ctx)
860 {
861 EVP_PKEY_CTX *pctx;
862 void *provctx;
863
864 if (ctx == NULL)
865 return NULL;
866
867 /* If we have a pctx then we should try that first */
868 pctx = ctx->pctx;
869 if (pctx != NULL
870 && (pctx->operation == EVP_PKEY_OP_VERIFYCTX
871 || pctx->operation == EVP_PKEY_OP_SIGNCTX)
872 && pctx->op.sig.algctx != NULL
873 && pctx->op.sig.signature->gettable_ctx_md_params != NULL)
874 return pctx->op.sig.signature->gettable_ctx_md_params(
875 pctx->op.sig.algctx);
876
877 if (ctx->digest != NULL && ctx->digest->gettable_ctx_params != NULL) {
878 provctx = ossl_provider_ctx(EVP_MD_get0_provider(ctx->digest));
879 return ctx->digest->gettable_ctx_params(ctx->algctx, provctx);
880 }
881 return NULL;
882 }
883
EVP_MD_CTX_ctrl(EVP_MD_CTX * ctx,int cmd,int p1,void * p2)884 int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)
885 {
886 int ret = EVP_CTRL_RET_UNSUPPORTED;
887 int set_params = 1;
888 size_t sz;
889 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
890
891 if (ctx == NULL) {
892 ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_NULL_PARAMETER);
893 return 0;
894 }
895
896 if (ctx->digest != NULL && ctx->digest->prov == NULL)
897 goto legacy;
898
899 switch (cmd) {
900 case EVP_MD_CTRL_XOF_LEN:
901 sz = (size_t)p1;
902 params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &sz);
903 break;
904 case EVP_MD_CTRL_MICALG:
905 set_params = 0;
906 params[0] = OSSL_PARAM_construct_utf8_string(OSSL_DIGEST_PARAM_MICALG,
907 p2, p1 ? p1 : 9999);
908 break;
909 case EVP_CTRL_SSL3_MASTER_SECRET:
910 params[0] = OSSL_PARAM_construct_octet_string(OSSL_DIGEST_PARAM_SSL3_MS,
911 p2, p1);
912 break;
913 default:
914 goto conclude;
915 }
916
917 if (set_params)
918 ret = EVP_MD_CTX_set_params(ctx, params);
919 else
920 ret = EVP_MD_CTX_get_params(ctx, params);
921 goto conclude;
922
923
924 /* Code below to be removed when legacy support is dropped. */
925 legacy:
926 if (ctx->digest->md_ctrl == NULL) {
927 ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_NOT_IMPLEMENTED);
928 return 0;
929 }
930
931 ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2);
932 conclude:
933 if (ret <= 0)
934 return 0;
935 return ret;
936 }
937
evp_md_new(void)938 EVP_MD *evp_md_new(void)
939 {
940 EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
941
942 if (md != NULL && !CRYPTO_NEW_REF(&md->refcnt, 1)) {
943 OPENSSL_free(md);
944 return NULL;
945 }
946 return md;
947 }
948
949 /*
950 * FIPS module note: since internal fetches will be entirely
951 * provider based, we know that none of its code depends on legacy
952 * NIDs or any functionality that use them.
953 */
954 #ifndef FIPS_MODULE
set_legacy_nid(const char * name,void * vlegacy_nid)955 static void set_legacy_nid(const char *name, void *vlegacy_nid)
956 {
957 int nid;
958 int *legacy_nid = vlegacy_nid;
959 /*
960 * We use lowest level function to get the associated method, because
961 * higher level functions such as EVP_get_digestbyname() have changed
962 * to look at providers too.
963 */
964 const void *legacy_method = OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);
965
966 if (*legacy_nid == -1) /* We found a clash already */
967 return;
968
969 if (legacy_method == NULL)
970 return;
971 nid = EVP_MD_nid(legacy_method);
972 if (*legacy_nid != NID_undef && *legacy_nid != nid) {
973 *legacy_nid = -1;
974 return;
975 }
976 *legacy_nid = nid;
977 }
978 #endif
979
evp_md_cache_constants(EVP_MD * md)980 static int evp_md_cache_constants(EVP_MD *md)
981 {
982 int ok, xof = 0, algid_absent = 0;
983 size_t blksz = 0;
984 size_t mdsize = 0;
985 OSSL_PARAM params[5];
986
987 params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_BLOCK_SIZE, &blksz);
988 params[1] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_SIZE, &mdsize);
989 params[2] = OSSL_PARAM_construct_int(OSSL_DIGEST_PARAM_XOF, &xof);
990 params[3] = OSSL_PARAM_construct_int(OSSL_DIGEST_PARAM_ALGID_ABSENT,
991 &algid_absent);
992 params[4] = OSSL_PARAM_construct_end();
993 ok = evp_do_md_getparams(md, params) > 0;
994 if (mdsize > INT_MAX || blksz > INT_MAX)
995 ok = 0;
996 if (ok) {
997 md->block_size = (int)blksz;
998 md->md_size = (int)mdsize;
999 if (xof)
1000 md->flags |= EVP_MD_FLAG_XOF;
1001 if (algid_absent)
1002 md->flags |= EVP_MD_FLAG_DIGALGID_ABSENT;
1003 }
1004 return ok;
1005 }
1006
evp_md_from_algorithm(int name_id,const OSSL_ALGORITHM * algodef,OSSL_PROVIDER * prov)1007 static void *evp_md_from_algorithm(int name_id,
1008 const OSSL_ALGORITHM *algodef,
1009 OSSL_PROVIDER *prov)
1010 {
1011 const OSSL_DISPATCH *fns = algodef->implementation;
1012 EVP_MD *md = NULL;
1013 int fncnt = 0;
1014
1015 /* EVP_MD_fetch() will set the legacy NID if available */
1016 if ((md = evp_md_new()) == NULL) {
1017 ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
1018 return NULL;
1019 }
1020
1021 #ifndef FIPS_MODULE
1022 md->type = NID_undef;
1023 if (!evp_names_do_all(prov, name_id, set_legacy_nid, &md->type)
1024 || md->type == -1) {
1025 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
1026 EVP_MD_free(md);
1027 return NULL;
1028 }
1029 #endif
1030
1031 md->name_id = name_id;
1032 if ((md->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
1033 EVP_MD_free(md);
1034 return NULL;
1035 }
1036 md->description = algodef->algorithm_description;
1037
1038 for (; fns->function_id != 0; fns++) {
1039 switch (fns->function_id) {
1040 case OSSL_FUNC_DIGEST_NEWCTX:
1041 if (md->newctx == NULL) {
1042 md->newctx = OSSL_FUNC_digest_newctx(fns);
1043 fncnt++;
1044 }
1045 break;
1046 case OSSL_FUNC_DIGEST_INIT:
1047 if (md->dinit == NULL) {
1048 md->dinit = OSSL_FUNC_digest_init(fns);
1049 fncnt++;
1050 }
1051 break;
1052 case OSSL_FUNC_DIGEST_UPDATE:
1053 if (md->dupdate == NULL) {
1054 md->dupdate = OSSL_FUNC_digest_update(fns);
1055 fncnt++;
1056 }
1057 break;
1058 case OSSL_FUNC_DIGEST_FINAL:
1059 if (md->dfinal == NULL) {
1060 md->dfinal = OSSL_FUNC_digest_final(fns);
1061 fncnt++;
1062 }
1063 break;
1064 case OSSL_FUNC_DIGEST_SQUEEZE:
1065 if (md->dsqueeze == NULL) {
1066 md->dsqueeze = OSSL_FUNC_digest_squeeze(fns);
1067 fncnt++;
1068 }
1069 break;
1070 case OSSL_FUNC_DIGEST_DIGEST:
1071 if (md->digest == NULL)
1072 md->digest = OSSL_FUNC_digest_digest(fns);
1073 /* We don't increment fnct for this as it is stand alone */
1074 break;
1075 case OSSL_FUNC_DIGEST_FREECTX:
1076 if (md->freectx == NULL) {
1077 md->freectx = OSSL_FUNC_digest_freectx(fns);
1078 fncnt++;
1079 }
1080 break;
1081 case OSSL_FUNC_DIGEST_DUPCTX:
1082 if (md->dupctx == NULL)
1083 md->dupctx = OSSL_FUNC_digest_dupctx(fns);
1084 break;
1085 case OSSL_FUNC_DIGEST_GET_PARAMS:
1086 if (md->get_params == NULL)
1087 md->get_params = OSSL_FUNC_digest_get_params(fns);
1088 break;
1089 case OSSL_FUNC_DIGEST_SET_CTX_PARAMS:
1090 if (md->set_ctx_params == NULL)
1091 md->set_ctx_params = OSSL_FUNC_digest_set_ctx_params(fns);
1092 break;
1093 case OSSL_FUNC_DIGEST_GET_CTX_PARAMS:
1094 if (md->get_ctx_params == NULL)
1095 md->get_ctx_params = OSSL_FUNC_digest_get_ctx_params(fns);
1096 break;
1097 case OSSL_FUNC_DIGEST_GETTABLE_PARAMS:
1098 if (md->gettable_params == NULL)
1099 md->gettable_params = OSSL_FUNC_digest_gettable_params(fns);
1100 break;
1101 case OSSL_FUNC_DIGEST_SETTABLE_CTX_PARAMS:
1102 if (md->settable_ctx_params == NULL)
1103 md->settable_ctx_params =
1104 OSSL_FUNC_digest_settable_ctx_params(fns);
1105 break;
1106 case OSSL_FUNC_DIGEST_GETTABLE_CTX_PARAMS:
1107 if (md->gettable_ctx_params == NULL)
1108 md->gettable_ctx_params =
1109 OSSL_FUNC_digest_gettable_ctx_params(fns);
1110 break;
1111 }
1112 }
1113 if ((fncnt != 0 && fncnt != 5 && fncnt != 6)
1114 || (fncnt == 0 && md->digest == NULL)) {
1115 /*
1116 * In order to be a consistent set of functions we either need the
1117 * whole set of init/update/final etc functions or none of them.
1118 * The "digest" function can standalone. We at least need one way to
1119 * generate digests.
1120 */
1121 EVP_MD_free(md);
1122 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
1123 return NULL;
1124 }
1125 md->prov = prov;
1126 if (prov != NULL)
1127 ossl_provider_up_ref(prov);
1128
1129 if (!evp_md_cache_constants(md)) {
1130 EVP_MD_free(md);
1131 ERR_raise(ERR_LIB_EVP, EVP_R_CACHE_CONSTANTS_FAILED);
1132 md = NULL;
1133 }
1134
1135 return md;
1136 }
1137
evp_md_up_ref(void * md)1138 static int evp_md_up_ref(void *md)
1139 {
1140 return EVP_MD_up_ref(md);
1141 }
1142
evp_md_free(void * md)1143 static void evp_md_free(void *md)
1144 {
1145 EVP_MD_free(md);
1146 }
1147
EVP_MD_fetch(OSSL_LIB_CTX * ctx,const char * algorithm,const char * properties)1148 EVP_MD *EVP_MD_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
1149 const char *properties)
1150 {
1151 EVP_MD *md =
1152 evp_generic_fetch(ctx, OSSL_OP_DIGEST, algorithm, properties,
1153 evp_md_from_algorithm, evp_md_up_ref, evp_md_free);
1154
1155 return md;
1156 }
1157
EVP_MD_up_ref(EVP_MD * md)1158 int EVP_MD_up_ref(EVP_MD *md)
1159 {
1160 int ref = 0;
1161
1162 if (md->origin == EVP_ORIG_DYNAMIC)
1163 CRYPTO_UP_REF(&md->refcnt, &ref);
1164 return 1;
1165 }
1166
EVP_MD_free(EVP_MD * md)1167 void EVP_MD_free(EVP_MD *md)
1168 {
1169 int i;
1170
1171 if (md == NULL || md->origin != EVP_ORIG_DYNAMIC)
1172 return;
1173
1174 CRYPTO_DOWN_REF(&md->refcnt, &i);
1175 if (i > 0)
1176 return;
1177 evp_md_free_int(md);
1178 }
1179
EVP_MD_do_all_provided(OSSL_LIB_CTX * libctx,void (* fn)(EVP_MD * mac,void * arg),void * arg)1180 void EVP_MD_do_all_provided(OSSL_LIB_CTX *libctx,
1181 void (*fn)(EVP_MD *mac, void *arg),
1182 void *arg)
1183 {
1184 evp_generic_do_all(libctx, OSSL_OP_DIGEST,
1185 (void (*)(void *, void *))fn, arg,
1186 evp_md_from_algorithm, evp_md_up_ref, evp_md_free);
1187 }
1188
