2 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
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
11 #include <openssl/objects.h>
12 #include <openssl/evp.h>
13 #include <openssl/engine.h>
14 #include <openssl/params.h>
15 #include <openssl/core_names.h>
16 #include "internal/cryptlib.h"
17 #include "internal/evp_int.h"
18 #include "internal/provider.h"
21 /* This call frees resources associated with the context */
22 int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
27 if (ctx->digest == NULL || ctx->digest->prov == NULL)
30 if (ctx->provctx != NULL) {
31 if (ctx->digest->freectx != NULL)
32 ctx->digest->freectx(ctx->provctx);
34 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
37 if (ctx->pctx != NULL)
42 /* TODO(3.0): Remove legacy code below */
46 * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
47 * sometimes only copies of the context are ever finalised.
49 if (ctx->digest && ctx->digest->cleanup
50 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED))
51 ctx->digest->cleanup(ctx);
52 if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
53 && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
54 OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
57 * pctx should be freed by the user of EVP_MD_CTX
58 * if EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set
61 /* TODO(3.0): Temporarily no support for EVP_DigestSign* in FIPS module */
62 if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX))
63 EVP_PKEY_CTX_free(ctx->pctx);
65 # ifndef OPENSSL_NO_ENGINE
66 ENGINE_finish(ctx->engine);
69 OPENSSL_cleanse(ctx, sizeof(*ctx));
74 EVP_MD_CTX *EVP_MD_CTX_new(void)
76 return OPENSSL_zalloc(sizeof(EVP_MD_CTX));
79 void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
84 if (ctx->digest == NULL || ctx->digest->prov == NULL)
87 EVP_MD_CTX_reset(ctx);
89 EVP_MD_free(ctx->fetched_digest);
90 ctx->fetched_digest = NULL;
92 ctx->reqdigest = NULL;
97 /* TODO(3.0): Remove legacy code below */
99 EVP_MD_CTX_reset(ctx);
103 int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
105 EVP_MD_CTX_reset(ctx);
106 return EVP_DigestInit_ex(ctx, type, NULL);
109 int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
111 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
112 ENGINE *tmpimpl = NULL;
115 EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
118 ctx->reqdigest = type;
120 /* TODO(3.0): Legacy work around code below. Remove this */
121 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
123 * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
124 * this context may already have an ENGINE! Try to avoid releasing the
125 * previous handle, re-querying for an ENGINE, and having a
126 * reinitialisation, when it may all be unnecessary.
128 if (ctx->engine && ctx->digest &&
129 (type == NULL || (type->type == ctx->digest->type)))
134 * Ensure an ENGINE left lying around from last time is cleared (the
135 * previous check attempted to avoid this if the same ENGINE and
136 * EVP_MD could be used).
138 ENGINE_finish(ctx->engine);
142 if (type != NULL && impl == NULL)
143 tmpimpl = ENGINE_get_digest_engine(type->type);
147 * If there are engines involved or if we're being used as part of
148 * EVP_DigestSignInit then we should use legacy handling for now.
150 if (ctx->engine != NULL
152 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
156 || (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0) {
157 if (ctx->digest == ctx->fetched_digest)
159 EVP_MD_free(ctx->fetched_digest);
160 ctx->fetched_digest = NULL;
164 if (ctx->digest != NULL && ctx->digest->ctx_size > 0) {
165 OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
169 /* TODO(3.0): Start of non-legacy code below */
171 if (type->prov == NULL) {
173 /* We only do explict fetches inside the FIPS module */
174 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
177 EVP_MD *provmd = EVP_MD_fetch(NULL, OBJ_nid2sn(type->type), "");
179 if (provmd == NULL) {
180 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
184 EVP_MD_free(ctx->fetched_digest);
185 ctx->fetched_digest = provmd;
189 if (ctx->provctx != NULL && ctx->digest != NULL && ctx->digest != type) {
190 if (ctx->digest->freectx != NULL)
191 ctx->digest->freectx(ctx->provctx);
195 if (ctx->provctx == NULL) {
196 ctx->provctx = ctx->digest->newctx(ossl_provider_ctx(type->prov));
197 if (ctx->provctx == NULL) {
198 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
203 if (ctx->digest->dinit == NULL) {
204 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
208 return ctx->digest->dinit(ctx->provctx);
210 /* TODO(3.0): Remove legacy code below */
213 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
216 if (!ENGINE_init(impl)) {
217 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
221 /* Ask if an ENGINE is reserved for this job */
225 /* There's an ENGINE for this job ... (apparently) */
226 const EVP_MD *d = ENGINE_get_digest(impl, type->type);
229 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
233 /* We'll use the ENGINE's private digest definition */
236 * Store the ENGINE functional reference so we know 'type' came
237 * from an ENGINE and we need to release it when done.
244 EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
250 if (ctx->digest != type) {
251 if (ctx->digest && ctx->digest->ctx_size) {
252 OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
256 if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) {
257 ctx->update = type->update;
258 ctx->md_data = OPENSSL_zalloc(type->ctx_size);
259 if (ctx->md_data == NULL) {
260 EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE);
265 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
270 * TODO(3.0): Temporarily no support for EVP_DigestSign* inside FIPS module
271 * or when using providers.
273 if (ctx->pctx != NULL
274 && (!EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx->pctx)
275 || ctx->pctx->op.sig.signature == NULL)) {
277 r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
278 EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
279 if (r <= 0 && (r != -2))
283 if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT)
285 return ctx->digest->init(ctx);
288 int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
293 if (ctx->digest == NULL || ctx->digest->prov == NULL)
296 if (ctx->digest->dupdate == NULL) {
297 EVPerr(EVP_F_EVP_DIGESTUPDATE, EVP_R_UPDATE_ERROR);
300 return ctx->digest->dupdate(ctx->provctx, data, count);
302 /* TODO(3.0): Remove legacy code below */
304 return ctx->update(ctx, data, count);
307 /* The caller can assume that this removes any secret data from the context */
308 int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size)
311 ret = EVP_DigestFinal_ex(ctx, md, size);
312 EVP_MD_CTX_reset(ctx);
316 /* The caller can assume that this removes any secret data from the context */
317 int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *isize)
321 size_t mdsize = EVP_MD_size(ctx->digest);
323 if (ctx->digest == NULL || ctx->digest->prov == NULL)
326 if (ctx->digest->dfinal == NULL) {
327 EVPerr(EVP_F_EVP_DIGESTFINAL_EX, EVP_R_FINAL_ERROR);
331 ret = ctx->digest->dfinal(ctx->provctx, md, &size, mdsize);
334 if (size <= UINT_MAX) {
337 EVPerr(EVP_F_EVP_DIGESTFINAL_EX, EVP_R_FINAL_ERROR);
342 EVP_MD_CTX_reset(ctx);
345 /* TODO(3.0): Remove legacy code below */
347 OPENSSL_assert(mdsize <= EVP_MAX_MD_SIZE);
348 ret = ctx->digest->final(ctx, md);
351 if (ctx->digest->cleanup) {
352 ctx->digest->cleanup(ctx);
353 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
355 OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
359 int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, unsigned char *md, size_t size)
362 OSSL_PARAM params[2];
365 if (ctx->digest == NULL || ctx->digest->prov == NULL)
368 if (ctx->digest->dfinal == NULL) {
369 EVPerr(EVP_F_EVP_DIGESTFINALXOF, EVP_R_FINAL_ERROR);
373 params[i++] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &size);
374 params[i++] = OSSL_PARAM_construct_end();
376 if (EVP_MD_CTX_set_params(ctx, params) > 0)
377 ret = ctx->digest->dfinal(ctx->provctx, md, &size, size);
378 EVP_MD_CTX_reset(ctx);
382 if (ctx->digest->flags & EVP_MD_FLAG_XOF
384 && ctx->digest->md_ctrl(ctx, EVP_MD_CTRL_XOF_LEN, (int)size, NULL)) {
385 ret = ctx->digest->final(ctx, md);
386 if (ctx->digest->cleanup != NULL) {
387 ctx->digest->cleanup(ctx);
388 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
390 OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
392 EVPerr(EVP_F_EVP_DIGESTFINALXOF, EVP_R_NOT_XOF_OR_INVALID_LENGTH);
398 int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
400 EVP_MD_CTX_reset(out);
401 return EVP_MD_CTX_copy_ex(out, in);
404 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
406 unsigned char *tmp_buf;
408 if (in == NULL || in->digest == NULL) {
409 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
413 if (in->digest->prov == NULL)
416 if (in->digest->dupctx == NULL) {
417 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_NOT_ABLE_TO_COPY_CTX);
421 EVP_MD_CTX_reset(out);
422 if (out->fetched_digest != NULL)
423 EVP_MD_free(out->fetched_digest);
425 /* NULL out pointers in case of error */
429 if (in->fetched_digest != NULL)
430 EVP_MD_up_ref(in->fetched_digest);
432 out->provctx = in->digest->dupctx(in->provctx);
433 if (out->provctx == NULL) {
434 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_NOT_ABLE_TO_COPY_CTX);
438 /* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
439 EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
441 /* TODO(3.0): Temporarily no support for EVP_DigestSign* in FIPS module */
442 if (in->pctx != NULL) {
443 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
444 if (out->pctx == NULL) {
445 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_NOT_ABLE_TO_COPY_CTX);
446 EVP_MD_CTX_reset(out);
454 /* TODO(3.0): Remove legacy code below */
456 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
457 /* Make sure it's safe to copy a digest context using an ENGINE */
458 if (in->engine && !ENGINE_init(in->engine)) {
459 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_ENGINE_LIB);
464 if (out->digest == in->digest) {
465 tmp_buf = out->md_data;
466 EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
469 EVP_MD_CTX_reset(out);
470 memcpy(out, in, sizeof(*out));
472 /* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
473 EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
475 /* Null these variables, since they are getting fixed up
476 * properly below. Anything else may cause a memleak and/or
477 * double free if any of the memory allocations below fail
482 if (in->md_data && out->digest->ctx_size) {
484 out->md_data = tmp_buf;
486 out->md_data = OPENSSL_malloc(out->digest->ctx_size);
487 if (out->md_data == NULL) {
488 EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE);
492 memcpy(out->md_data, in->md_data, out->digest->ctx_size);
495 out->update = in->update;
498 /* TODO(3.0): Temporarily no support for EVP_DigestSign* in FIPS module */
500 out->pctx = EVP_PKEY_CTX_dup(in->pctx);
502 EVP_MD_CTX_reset(out);
508 if (out->digest->copy)
509 return out->digest->copy(out, in);
514 int EVP_Digest(const void *data, size_t count,
515 unsigned char *md, unsigned int *size, const EVP_MD *type,
518 EVP_MD_CTX *ctx = EVP_MD_CTX_new();
523 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_ONESHOT);
524 ret = EVP_DigestInit_ex(ctx, type, impl)
525 && EVP_DigestUpdate(ctx, data, count)
526 && EVP_DigestFinal_ex(ctx, md, size);
527 EVP_MD_CTX_free(ctx);
532 int EVP_MD_get_params(const EVP_MD *digest, OSSL_PARAM params[])
534 if (digest != NULL && digest->get_params != NULL)
535 return digest->get_params(params);
539 const OSSL_PARAM *EVP_MD_gettable_params(const EVP_MD *digest)
541 if (digest != NULL && digest->gettable_params != NULL)
542 return digest->gettable_params();
546 int EVP_MD_CTX_set_params(EVP_MD_CTX *ctx, const OSSL_PARAM params[])
548 if (ctx->digest != NULL && ctx->digest->set_ctx_params != NULL)
549 return ctx->digest->set_ctx_params(ctx->provctx, params);
553 const OSSL_PARAM *EVP_MD_CTX_settable_params(const EVP_MD *digest)
555 if (digest != NULL && digest->settable_ctx_params != NULL)
556 return digest->settable_ctx_params();
560 int EVP_MD_CTX_get_params(EVP_MD_CTX *ctx, OSSL_PARAM params[])
562 if (ctx->digest != NULL && ctx->digest->get_params != NULL)
563 return ctx->digest->get_ctx_params(ctx->provctx, params);
567 const OSSL_PARAM *EVP_MD_CTX_gettable_params(const EVP_MD *digest)
569 if (digest != NULL && digest->gettable_ctx_params != NULL)
570 return digest->gettable_ctx_params();
574 /* TODO(3.0): Remove legacy code below - only used by engines & DigestSign */
575 int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)
577 int ret = EVP_CTRL_RET_UNSUPPORTED;
580 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
582 if (ctx == NULL || ctx->digest == NULL) {
583 ERR_raise(ERR_LIB_EVP, EVP_R_MESSAGE_DIGEST_IS_NULL);
587 if (ctx->digest->prov == NULL)
591 case EVP_MD_CTRL_XOF_LEN:
593 params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &sz);
595 case EVP_MD_CTRL_MICALG:
597 params[0] = OSSL_PARAM_construct_utf8_string(OSSL_DIGEST_PARAM_MICALG,
601 return EVP_CTRL_RET_UNSUPPORTED;
605 ret = evp_do_md_ctx_setparams(ctx->digest, ctx->provctx, params);
607 ret = evp_do_md_ctx_getparams(ctx->digest, ctx->provctx, params);
611 /* TODO(3.0): Remove legacy code below */
613 if (ctx->digest->md_ctrl == NULL) {
614 ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_NOT_IMPLEMENTED);
618 ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2);
624 EVP_MD *evp_md_new(void)
626 EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
629 md->lock = CRYPTO_THREAD_lock_new();
630 if (md->lock == NULL) {
640 * FIPS module note: since internal fetches will be entirely
641 * provider based, we know that none of its code depends on legacy
642 * NIDs or any functionality that use them.
645 /* TODO(3.x) get rid of the need for legacy NIDs */
646 static void set_legacy_nid(const char *name, void *vlegacy_nid)
649 int *legacy_nid = vlegacy_nid;
651 if (*legacy_nid == -1) /* We found a clash already */
653 if ((nid = OBJ_sn2nid(name)) == NID_undef
654 && (nid = OBJ_ln2nid(name)) == NID_undef)
656 if (*legacy_nid != NID_undef && *legacy_nid != nid) {
664 static void *evp_md_from_dispatch(int name_id,
665 const OSSL_DISPATCH *fns,
666 OSSL_PROVIDER *prov, void *unused)
671 /* EVP_MD_fetch() will set the legacy NID if available */
672 if ((md = evp_md_new()) == NULL) {
673 EVPerr(0, ERR_R_MALLOC_FAILURE);
678 /* TODO(3.x) get rid of the need for legacy NIDs */
679 md->type = NID_undef;
680 evp_doall_names(prov, name_id, set_legacy_nid, &md->type);
681 if (md->type == -1) {
682 ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
688 md->name_id = name_id;
690 for (; fns->function_id != 0; fns++) {
691 switch (fns->function_id) {
692 case OSSL_FUNC_DIGEST_NEWCTX:
693 if (md->newctx == NULL) {
694 md->newctx = OSSL_get_OP_digest_newctx(fns);
698 case OSSL_FUNC_DIGEST_INIT:
699 if (md->dinit == NULL) {
700 md->dinit = OSSL_get_OP_digest_init(fns);
704 case OSSL_FUNC_DIGEST_UPDATE:
705 if (md->dupdate == NULL) {
706 md->dupdate = OSSL_get_OP_digest_update(fns);
710 case OSSL_FUNC_DIGEST_FINAL:
711 if (md->dfinal == NULL) {
712 md->dfinal = OSSL_get_OP_digest_final(fns);
716 case OSSL_FUNC_DIGEST_DIGEST:
717 if (md->digest == NULL)
718 md->digest = OSSL_get_OP_digest_digest(fns);
719 /* We don't increment fnct for this as it is stand alone */
721 case OSSL_FUNC_DIGEST_FREECTX:
722 if (md->freectx == NULL) {
723 md->freectx = OSSL_get_OP_digest_freectx(fns);
727 case OSSL_FUNC_DIGEST_DUPCTX:
728 if (md->dupctx == NULL)
729 md->dupctx = OSSL_get_OP_digest_dupctx(fns);
731 case OSSL_FUNC_DIGEST_GET_PARAMS:
732 if (md->get_params == NULL)
733 md->get_params = OSSL_get_OP_digest_get_params(fns);
735 case OSSL_FUNC_DIGEST_SET_CTX_PARAMS:
736 if (md->set_ctx_params == NULL)
737 md->set_ctx_params = OSSL_get_OP_digest_set_ctx_params(fns);
739 case OSSL_FUNC_DIGEST_GET_CTX_PARAMS:
740 if (md->get_ctx_params == NULL)
741 md->get_ctx_params = OSSL_get_OP_digest_get_ctx_params(fns);
743 case OSSL_FUNC_DIGEST_GETTABLE_PARAMS:
744 if (md->gettable_params == NULL)
745 md->gettable_params = OSSL_get_OP_digest_gettable_params(fns);
747 case OSSL_FUNC_DIGEST_SETTABLE_CTX_PARAMS:
748 if (md->settable_ctx_params == NULL)
749 md->settable_ctx_params =
750 OSSL_get_OP_digest_settable_ctx_params(fns);
752 case OSSL_FUNC_DIGEST_GETTABLE_CTX_PARAMS:
753 if (md->gettable_ctx_params == NULL)
754 md->gettable_ctx_params =
755 OSSL_get_OP_digest_gettable_ctx_params(fns);
759 if ((fncnt != 0 && fncnt != 5)
760 || (fncnt == 0 && md->digest == NULL)) {
762 * In order to be a consistent set of functions we either need the
763 * whole set of init/update/final etc functions or none of them.
764 * The "digest" function can standalone. We at least need one way to
768 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
773 ossl_provider_up_ref(prov);
778 static int evp_md_up_ref(void *md)
780 return EVP_MD_up_ref(md);
783 static void evp_md_free(void *md)
788 EVP_MD *EVP_MD_fetch(OPENSSL_CTX *ctx, const char *algorithm,
789 const char *properties)
792 evp_generic_fetch(ctx, OSSL_OP_DIGEST, algorithm, properties,
793 evp_md_from_dispatch, NULL, evp_md_up_ref,
799 int EVP_MD_up_ref(EVP_MD *md)
803 CRYPTO_UP_REF(&md->refcnt, &ref, md->lock);
807 void EVP_MD_free(EVP_MD *md)
814 CRYPTO_DOWN_REF(&md->refcnt, &i, md->lock);
817 ossl_provider_free(md->prov);
818 CRYPTO_THREAD_lock_free(md->lock);
822 void EVP_MD_do_all_ex(OPENSSL_CTX *libctx,
823 void (*fn)(EVP_MD *mac, void *arg),
826 evp_generic_do_all(libctx, OSSL_OP_DIGEST,
827 (void (*)(void *, void *))fn, arg,
828 evp_md_from_dispatch, NULL, evp_md_free);