+
+ if (ctx->digest->prov == NULL)
+ goto legacy;
+
+ switch (cmd) {
+ case EVP_MD_CTRL_XOF_LEN:
+ sz = (size_t)p1;
+ params[0] = OSSL_PARAM_construct_size_t(OSSL_DIGEST_PARAM_XOFLEN, &sz);
+ break;
+ case EVP_MD_CTRL_MICALG:
+ set_params = 0;
+ params[0] = OSSL_PARAM_construct_utf8_string(OSSL_DIGEST_PARAM_MICALG,
+ p2, p1 ? p1 : 9999);
+ break;
+ default:
+ return EVP_CTRL_RET_UNSUPPORTED;
+ }
+
+ if (set_params)
+ ret = evp_do_md_ctx_setparams(ctx->digest, ctx->provctx, params);
+ else
+ ret = evp_do_md_ctx_getparams(ctx->digest, ctx->provctx, params);
+ return ret;
+
+
+/* TODO(3.0): Remove legacy code below */
+ legacy:
+ if (ctx->digest->md_ctrl == NULL) {
+ ERR_raise(ERR_LIB_EVP, EVP_R_CTRL_NOT_IMPLEMENTED);
+ return 0;
+ }
+
+ ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2);
+ if (ret <= 0)
+ return 0;
+ return ret;
+}
+
+EVP_MD *evp_md_new(void)
+{
+ EVP_MD *md = OPENSSL_zalloc(sizeof(*md));
+
+ if (md != NULL) {
+ md->lock = CRYPTO_THREAD_lock_new();
+ if (md->lock == NULL) {
+ OPENSSL_free(md);
+ return NULL;
+ }
+ md->refcnt = 1;
+ }
+ return md;
+}
+
+/*
+ * FIPS module note: since internal fetches will be entirely
+ * provider based, we know that none of its code depends on legacy
+ * NIDs or any functionality that use them.
+ */
+#ifndef FIPS_MODE
+/* TODO(3.x) get rid of the need for legacy NIDs */
+static void set_legacy_nid(const char *name, void *vlegacy_nid)
+{
+ int nid;
+ int *legacy_nid = vlegacy_nid;
+
+ if (*legacy_nid == -1) /* We found a clash already */
+ return;
+ if ((nid = OBJ_sn2nid(name)) == NID_undef
+ && (nid = OBJ_ln2nid(name)) == NID_undef)
+ return;
+ if (*legacy_nid != NID_undef && *legacy_nid != nid) {
+ *legacy_nid = -1;
+ return;
+ }
+ *legacy_nid = nid;
+}
+#endif
+
+static void *evp_md_from_dispatch(int name_id,
+ const OSSL_DISPATCH *fns,
+ OSSL_PROVIDER *prov, void *unused)
+{
+ EVP_MD *md = NULL;
+ int fncnt = 0;
+
+ /* EVP_MD_fetch() will set the legacy NID if available */
+ if ((md = evp_md_new()) == NULL) {
+ EVPerr(0, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+#ifndef FIPS_MODE
+ /* TODO(3.x) get rid of the need for legacy NIDs */
+ md->type = NID_undef;
+ evp_doall_names(prov, name_id, set_legacy_nid, &md->type);
+ if (md->type == -1) {
+ ERR_raise(ERR_LIB_EVP, ERR_R_INTERNAL_ERROR);
+ EVP_MD_free(md);
+ return NULL;
+ }
+#endif
+
+ md->name_id = name_id;
+
+ for (; fns->function_id != 0; fns++) {
+ switch (fns->function_id) {
+ case OSSL_FUNC_DIGEST_NEWCTX:
+ if (md->newctx == NULL) {
+ md->newctx = OSSL_get_OP_digest_newctx(fns);
+ fncnt++;
+ }
+ break;
+ case OSSL_FUNC_DIGEST_INIT:
+ if (md->dinit == NULL) {
+ md->dinit = OSSL_get_OP_digest_init(fns);
+ fncnt++;
+ }
+ break;
+ case OSSL_FUNC_DIGEST_UPDATE:
+ if (md->dupdate == NULL) {
+ md->dupdate = OSSL_get_OP_digest_update(fns);
+ fncnt++;
+ }
+ break;
+ case OSSL_FUNC_DIGEST_FINAL:
+ if (md->dfinal == NULL) {
+ md->dfinal = OSSL_get_OP_digest_final(fns);
+ fncnt++;
+ }
+ break;
+ case OSSL_FUNC_DIGEST_DIGEST:
+ if (md->digest == NULL)
+ md->digest = OSSL_get_OP_digest_digest(fns);
+ /* We don't increment fnct for this as it is stand alone */
+ break;
+ case OSSL_FUNC_DIGEST_FREECTX:
+ if (md->freectx == NULL) {
+ md->freectx = OSSL_get_OP_digest_freectx(fns);
+ fncnt++;
+ }
+ break;
+ case OSSL_FUNC_DIGEST_DUPCTX:
+ if (md->dupctx == NULL)
+ md->dupctx = OSSL_get_OP_digest_dupctx(fns);
+ break;
+ case OSSL_FUNC_DIGEST_GET_PARAMS:
+ if (md->get_params == NULL)
+ md->get_params = OSSL_get_OP_digest_get_params(fns);
+ break;
+ case OSSL_FUNC_DIGEST_SET_CTX_PARAMS:
+ if (md->set_ctx_params == NULL)
+ md->set_ctx_params = OSSL_get_OP_digest_set_ctx_params(fns);
+ break;
+ case OSSL_FUNC_DIGEST_GET_CTX_PARAMS:
+ if (md->get_ctx_params == NULL)
+ md->get_ctx_params = OSSL_get_OP_digest_get_ctx_params(fns);
+ break;
+ case OSSL_FUNC_DIGEST_GETTABLE_PARAMS:
+ if (md->gettable_params == NULL)
+ md->gettable_params = OSSL_get_OP_digest_gettable_params(fns);
+ break;
+ case OSSL_FUNC_DIGEST_SETTABLE_CTX_PARAMS:
+ if (md->settable_ctx_params == NULL)
+ md->settable_ctx_params =
+ OSSL_get_OP_digest_settable_ctx_params(fns);
+ break;
+ case OSSL_FUNC_DIGEST_GETTABLE_CTX_PARAMS:
+ if (md->gettable_ctx_params == NULL)
+ md->gettable_ctx_params =
+ OSSL_get_OP_digest_gettable_ctx_params(fns);
+ break;
+ }
+ }
+ if ((fncnt != 0 && fncnt != 5)
+ || (fncnt == 0 && md->digest == NULL)) {
+ /*
+ * In order to be a consistent set of functions we either need the
+ * whole set of init/update/final etc functions or none of them.
+ * The "digest" function can standalone. We at least need one way to
+ * generate digests.
+ */
+ EVP_MD_free(md);
+ ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
+ return NULL;
+ }
+ md->prov = prov;
+ if (prov != NULL)
+ ossl_provider_up_ref(prov);
+
+ return md;
+}
+
+static int evp_md_up_ref(void *md)
+{
+ return EVP_MD_up_ref(md);
+}
+
+static void evp_md_free(void *md)
+{
+ EVP_MD_free(md);
+}
+
+EVP_MD *EVP_MD_fetch(OPENSSL_CTX *ctx, const char *algorithm,
+ const char *properties)
+{
+ EVP_MD *md =
+ evp_generic_fetch(ctx, OSSL_OP_DIGEST, algorithm, properties,
+ evp_md_from_dispatch, NULL, evp_md_up_ref,
+ evp_md_free);
+
+ return md;
+}
+
+int EVP_MD_up_ref(EVP_MD *md)
+{
+ int ref = 0;
+
+ CRYPTO_UP_REF(&md->refcnt, &ref, md->lock);
+ return 1;
+}
+
+void EVP_MD_free(EVP_MD *md)
+{
+ int i;
+
+ if (md == NULL)
+ return;
+
+ CRYPTO_DOWN_REF(&md->refcnt, &i, md->lock);
+ if (i > 0)
+ return;
+ ossl_provider_free(md->prov);
+ CRYPTO_THREAD_lock_free(md->lock);
+ OPENSSL_free(md);
+}
+
+void EVP_MD_do_all_ex(OPENSSL_CTX *libctx,
+ void (*fn)(EVP_MD *mac, void *arg),
+ void *arg)
+{
+ evp_generic_do_all(libctx, OSSL_OP_DIGEST,
+ (void (*)(void *, void *))fn, arg,
+ evp_md_from_dispatch, NULL, evp_md_free);