Backport fix for behavior change for EVP_get_{cipher,digest}byname()
https://github.com/openbsd/src/commit/ace1aaedae16f4098783ed4a8c5602142650126c

--- crypto/evp/evp_names.c.orig	Mon Mar 25 17:27:41 2024
+++ crypto/evp/evp_names.c	Mon Mar 25 17:30:27 2024
@@ -1852,6 +1852,9 @@ EVP_get_cipherbyname(const char *name)
 	if (!OPENSSL_init_crypto(0, NULL))
 		return NULL;
 
+	if (name == NULL)
+		return NULL;
+
 	if ((cipher = bsearch(name, cipher_names, N_CIPHER_NAMES,
 	    sizeof(*cipher), cipher_cmp)) == NULL)
 		return NULL;
@@ -1871,6 +1874,9 @@ EVP_get_digestbyname(const char *name)
 	const struct digest_name *digest;
 
 	if (!OPENSSL_init_crypto(0, NULL))
+		return NULL;
+
+	if (name == NULL)
 		return NULL;
 
 	if ((digest = bsearch(name, digest_names, N_DIGEST_NAMES,
--- tests/evp_test.c.orig	Mon Mar 25 17:27:41 2024
+++ tests/evp_test.c	Mon Mar 25 17:31:32 2024
@@ -737,6 +737,28 @@ obj_name_do_all_test(void)
 	return failure;
 }
 
+static int
+evp_get_cipherbyname_test(void)
+{
+	int failure = 0;
+
+	/* Should handle NULL gracefully */
+	failure |= EVP_get_cipherbyname(NULL) != NULL;
+
+	return failure;
+}
+
+static int
+evp_get_digestbyname_test(void)
+{
+	int failure = 0;
+
+	/* Should handle NULL gracefully */
+	failure |= EVP_get_digestbyname(NULL) != NULL;
+
+	return failure;
+}
+
 int
 main(int argc, char **argv)
 {
@@ -748,6 +770,8 @@ main(int argc, char **argv)
 	failed |= evp_do_all_test();
 	failed |= evp_aliases_test();
 	failed |= obj_name_do_all_test();
+	failed |= evp_get_cipherbyname_test();
+	failed |= evp_get_digestbyname_test();
 
 	OPENSSL_cleanup();