Fix EVP_PKEY_{asn1,meth}_copy once and for all

It is very easy to forget to copy over newly added methods. Everyone
working in this corner has run into this. Instead, preserve what needs
preserving and use a struct copy, so all methods get copied from src
to dest.

tweak/ok jsing

1 files changed, 16 insertions, 29 deletions

diff --git a/lib/libcrypto/asn1/ameth_lib.c b/lib/libcrypto/asn1/ameth_lib.c
index 8be82060ef5..545ba8f1a17 100644
--- a/lib/libcrypto/asn1/ameth_lib.c
+++ b/lib/libcrypto/asn1/ameth_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ameth_lib.c,v 1.21 2019/11/02 16:06:25 inoguchi Exp $ */
+/* $OpenBSD: ameth_lib.c,v 1.22 2021/12/03 14:18:06 tb Exp $ */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 2006.
  */
@@ -340,34 +340,21 @@ EVP_PKEY_asn1_new(int id, int flags, const char *pem_str, const char *info)
 void
 EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst, const EVP_PKEY_ASN1_METHOD *src)
 {
-	dst->pub_decode = src->pub_decode;
-	dst->pub_encode = src->pub_encode;
-	dst->pub_cmp = src->pub_cmp;
-	dst->pub_print = src->pub_print;
-
-	dst->priv_decode = src->priv_decode;
-	dst->priv_encode = src->priv_encode;
-	dst->priv_print = src->priv_print;
-
-	dst->old_priv_encode = src->old_priv_encode;
-	dst->old_priv_decode = src->old_priv_decode;
-
-	dst->pkey_size = src->pkey_size;
-	dst->pkey_bits = src->pkey_bits;
-
-	dst->param_decode = src->param_decode;
-	dst->param_encode = src->param_encode;
-	dst->param_missing = src->param_missing;
-	dst->param_copy = src->param_copy;
-	dst->param_cmp = src->param_cmp;
-	dst->param_print = src->param_print;
-	dst->sig_print = src->sig_print;
-
-	dst->pkey_free = src->pkey_free;
-	dst->pkey_ctrl = src->pkey_ctrl;
-
-	dst->item_sign = src->item_sign;
-	dst->item_verify = src->item_verify;
+	EVP_PKEY_ASN1_METHOD preserve;
+
+	preserve.pkey_id = dst->pkey_id;
+	preserve.pkey_base_id = dst->pkey_base_id;
+	preserve.pkey_flags = dst->pkey_flags;
+	preserve.pem_str = dst->pem_str;
+	preserve.info = dst->info;
+
+	*dst = *src;
+
+	dst->pkey_id = preserve.pkey_id;
+	dst->pkey_base_id = preserve.pkey_base_id;
+	dst->pkey_flags = preserve.pkey_flags;
+	dst->pem_str = preserve.pem_str;
+	dst->info = preserve.info;
 }
 
 void