Add EVP_MD_CTX_legacy_clear()

This is analogous to EVP_CIPHER_CTX_legacy_clear() and will serve as an
internal replacement for EVP_MD_CTX_init() until the conversion to heap
allocated ctx is completed. This way EVP_MD_CTX_init() can be changed to
match the OpenSSL 1.1 API.

ok jsing

2 files changed, 9 insertions, 2 deletions

diff --git a/src/lib/libcrypto/evp/evp_digest.c b/src/lib/libcrypto/evp/evp_digest.c
index 9d8d94afb1..33ba923e72 100644
--- a/src/lib/libcrypto/evp/evp_digest.c
+++ b/src/lib/libcrypto/evp/evp_digest.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: evp_digest.c,v 1.8 2024/01/30 17:41:01 tb Exp $ */
+/* $OpenBSD: evp_digest.c,v 1.9 2024/02/18 15:43:21 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -252,6 +252,12 @@ EVP_MD_CTX_init(EVP_MD_CTX *ctx)
         memset(ctx, 0, sizeof(*ctx));
 }
 
+void
+EVP_MD_CTX_legacy_clear(EVP_MD_CTX *ctx)
+{
+        memset(ctx, 0, sizeof(*ctx));
+}
+
 int
 EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
 {
diff --git a/src/lib/libcrypto/evp/evp_local.h b/src/lib/libcrypto/evp/evp_local.h
index 8b24be6039..65d23547bc 100644
--- a/src/lib/libcrypto/evp/evp_local.h
+++ b/src/lib/libcrypto/evp/evp_local.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: evp_local.h,v 1.15 2024/02/18 15:41:50 tb Exp $ */
+/* $OpenBSD: evp_local.h,v 1.16 2024/02/18 15:43:21 tb Exp $ */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 2000.
  */
@@ -378,6 +378,7 @@ int EVP_PKEY_CTX_hex2ctrl(EVP_PKEY_CTX *ctx, int cmd, const char *hex);
 int EVP_PKEY_CTX_md(EVP_PKEY_CTX *ctx, int optype, int cmd, const char *md_name);
 
 void EVP_CIPHER_CTX_legacy_clear(EVP_CIPHER_CTX *ctx);
+void EVP_MD_CTX_legacy_clear(EVP_MD_CTX *ctx);
 
 __END_HIDDEN_DECLS