evp_get_digest/cipherbyname_ex(): Try to fetch if not found

If the name is not found in namemap, we need
to try to fetch the algorithm and query the
namemap again.

Fixes openssl#19338

Reviewed-by: Neil Horman <[email protected]>
Reviewed-by: Paul Dale <[email protected]>
Reviewed-by: Shane Lontis <[email protected]>
(Merged from openssl#24940)

(cherry picked from commit 454ca90)

crypto/evp/names.c

@@ -78,6 +78,7 @@ const EVP_CIPHER *evp_get_cipherbyname_ex(OSSL_LIB_CTX *libctx,
     const EVP_CIPHER *cp;
     OSSL_NAMEMAP *namemap;
     int id;
+    int do_retry = 1;
 
     if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS, NULL))
         return NULL;
@@ -94,9 +95,21 @@ const EVP_CIPHER *evp_get_cipherbyname_ex(OSSL_LIB_CTX *libctx,
      */
 
     namemap = ossl_namemap_stored(libctx);
+ retry:
     id = ossl_namemap_name2num(namemap, name);
-    if (id == 0)
-        return NULL;
+    if (id == 0) {
+        EVP_CIPHER *fetched_cipher;
+
+        /* Try to fetch it because the name might not be known yet. */
+        if (!do_retry)
+            return NULL;
+        do_retry = 0;
+        ERR_set_mark();
+        fetched_cipher = EVP_CIPHER_fetch(libctx, name, NULL);
+        EVP_CIPHER_free(fetched_cipher);
+        ERR_pop_to_mark();
+        goto retry;
+    }
 
     if (!ossl_namemap_doall_names(namemap, id, cipher_from_name, &cp))
         return NULL;
@@ -124,6 +137,7 @@ const EVP_MD *evp_get_digestbyname_ex(OSSL_LIB_CTX *libctx, const char *name)
     const EVP_MD *dp;
     OSSL_NAMEMAP *namemap;
     int id;
+    int do_retry = 1;
 
     if (!OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_DIGESTS, NULL))
         return NULL;
@@ -140,9 +154,21 @@ const EVP_MD *evp_get_digestbyname_ex(OSSL_LIB_CTX *libctx, const char *name)
      */
 
     namemap = ossl_namemap_stored(libctx);
+ retry:
     id = ossl_namemap_name2num(namemap, name);
-    if (id == 0)
-        return NULL;
+    if (id == 0) {
+        EVP_MD *fetched_md;
+
+        /* Try to fetch it because the name might not be known yet. */
+        if (!do_retry)
+            return NULL;
+        do_retry = 0;
+        ERR_set_mark();
+        fetched_md = EVP_MD_fetch(libctx, name, NULL);
+        EVP_MD_free(fetched_md);
+        ERR_pop_to_mark();
+        goto retry;
+    }
 
     if (!ossl_namemap_doall_names(namemap, id, digest_from_name, &dp))
         return NULL;

test/build.info

@@ -40,7 +40,7 @@ IF[{- !$disabled{tests} -}]
           exptest pbetest localetest evp_pkey_ctx_new_from_name \
           evp_pkey_provided_test evp_test evp_extra_test evp_extra_test2 \
           evp_fetch_prov_test evp_libctx_test ossl_store_test \
-          v3nametest v3ext punycode_test \
+          v3nametest v3ext punycode_test evp_byname_test \
           crltest danetest bad_dtls_test lhash_test sparse_array_test \
           conf_include_test params_api_test params_conversion_test \
           constant_time_test verify_extra_test clienthellotest \
@@ -305,6 +305,10 @@ IF[{- !$disabled{tests} -}]
   INCLUDE[punycode_test]=../include ../apps/include
   DEPEND[punycode_test]=../libcrypto.a libtestutil.a
 
+  SOURCE[evp_byname_test]=evp_byname_test.c
+  INCLUDE[evp_byname_test]=../include ../apps/include
+  DEPEND[evp_byname_test]=../libcrypto libtestutil.a
+
   SOURCE[stack_test]=stack_test.c
   INCLUDE[stack_test]=../include ../apps/include
   DEPEND[stack_test]=../libcrypto libtestutil.a

test/evp_byname_test.c

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2024 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <openssl/evp.h>
+#include "testutil.h"
+
+static int test_evp_get_digestbyname(void)
+{
+    const EVP_MD *md;
+
+    if (!TEST_ptr(md = EVP_get_digestbyname("SHA2-256")))
+        return 0;
+    return 1;
+}
+
+static int test_evp_get_cipherbyname(void)
+{
+    const EVP_CIPHER *cipher;
+
+    if (!TEST_ptr(cipher = EVP_get_cipherbyname("AES-256-WRAP")))
+        return 0;
+    return 1;
+}
+
+int setup_tests(void)
+{
+    ADD_TEST(test_evp_get_digestbyname);
+    ADD_TEST(test_evp_get_cipherbyname);
+    return 1;
+}

test/recipes/30-test_evp_byname.t

@@ -0,0 +1,16 @@
+#! /usr/bin/env perl
+# Copyright 2024 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the Apache License 2.0 (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+use strict;
+use OpenSSL::Test;
+use OpenSSL::Test::Simple;
+use OpenSSL::Test::Utils;
+
+setup("test_evp_byname");
+
+simple_test("test_evp_byname", "evp_byname_test");