Reimplement EVP_get_{cipher,digest}byname()

Instead of a hashtable lookup do a bsearch() over the static table.
This needs about the same number of strcmp and is a lot simpler.

ok jsing

2 files changed, 47 insertions, 20 deletions

diff --git a/lib/libcrypto/evp/evp_names.c b/lib/libcrypto/evp/evp_names.c
index b5d3b95b453..660e23f66e5 100644
--- a/lib/libcrypto/evp/evp_names.c
+++ b/lib/libcrypto/evp/evp_names.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: evp_names.c,v 1.3 2024/01/13 11:08:39 tb Exp $ */
+/*	$OpenBSD: evp_names.c,v 1.4 2024/01/13 11:12:32 tb Exp $ */
 /*
  * Copyright (c) 2023 Theo Buehler <tb@openbsd.org>
  *
@@ -18,6 +18,9 @@
 #include <openssl/evp.h>
 #include <openssl/objects.h>
 
+#include <stdlib.h>
+#include <string.h>
+
 /*
  * In the following two structs, .name is the lookup name that is used
  * for EVP_get_cipherbyname() and EVP_get_digestbyname(), while .alias
@@ -1715,3 +1718,45 @@ OBJ_NAME_do_all(int type, void (*fn)(const OBJ_NAME *, void *), void *arg)
 	OBJ_NAME_do_all_sorted(type, fn, arg);
 }
 LCRYPTO_ALIAS(OBJ_NAME_do_all);
+
+static int
+cipher_cmp(const void *a, const void *b)
+{
+	return strcmp(a, ((const struct cipher_name *)b)->name);
+}
+
+const EVP_CIPHER *
+EVP_get_cipherbyname(const char *name)
+{
+	const struct cipher_name *cipher;
+
+	if (!OPENSSL_init_crypto(0, NULL))
+		return NULL;
+
+	if ((cipher = bsearch(name, cipher_names, N_CIPHER_NAMES,
+	    sizeof(*cipher), cipher_cmp)) == NULL)
+		return NULL;
+
+	return cipher->cipher();
+}
+
+static int
+digest_cmp(const void *a, const void *b)
+{
+	return strcmp(a, ((const struct digest_name *)b)->name);
+}
+
+const EVP_MD *
+EVP_get_digestbyname(const char *name)
+{
+	const struct digest_name *digest;
+
+	if (!OPENSSL_init_crypto(0, NULL))
+		return NULL;
+
+	if ((digest = bsearch(name, digest_names, N_DIGEST_NAMES,
+	    sizeof(*digest), digest_cmp)) == NULL)
+		return NULL;
+
+	return digest->digest();
+}
diff --git a/lib/libcrypto/evp/names.c b/lib/libcrypto/evp/names.c
index 7f5b4550885..8cc6d04ce38 100644
--- a/lib/libcrypto/evp/names.c
+++ b/lib/libcrypto/evp/names.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: names.c,v 1.23 2024/01/13 11:08:39 tb Exp $ */
+/* $OpenBSD: names.c,v 1.24 2024/01/13 11:12:32 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -113,24 +113,6 @@ EVP_add_digest(const EVP_MD *md)
 	return (r);
 }
 
-const EVP_CIPHER *
-EVP_get_cipherbyname(const char *name)
-{
-	if (!OPENSSL_init_crypto(0, NULL))
-		return NULL;
-
-	return (const EVP_CIPHER *)OBJ_NAME_get(name, OBJ_NAME_TYPE_CIPHER_METH);
-}
-
-const EVP_MD *
-EVP_get_digestbyname(const char *name)
-{
-	if (!OPENSSL_init_crypto(0, NULL))
-		return NULL;
-
-	return (const EVP_MD *)OBJ_NAME_get(name, OBJ_NAME_TYPE_MD_METH);
-}
-
 void
 EVP_cleanup(void)
 {