EVP: Limit the diverse key parameter functions to domain params only

Provider KEYMGMT functions can handle domain parameters as well as
"other" parameters (the cofactor mode flag in ECC keys is one of
those).  The public EVP functions EVP_PKEY_copy_parameters(),
EVP_PKEY_missing_parameters(), EVP_PKEY_cmp_parameters() and
EVP_PKEY_cmp() tried to handle all parameters, but looking back at
EVP_PKEY_ASN1_METHOD code (especially crypto/ec/ec_ameth.c), it turns
out that they only need to concern themselves with domain parameters.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11375)

diff --git a/crypto/evp/p_lib.c b/crypto/evp/p_lib.c
index 92d65d9f437b95fc8037e40c0288fde4413de000..9ed238e3664b0b9a1553a01c7a38f09a99ad6840 100644 (file)
--- a/crypto/evp/p_lib.c
+++ b/crypto/evp/p_lib.c
@@ -41,6 +41,9 @@ static void evp_pkey_free_it(EVP_PKEY *key);
 
 #ifndef FIPS_MODE
 
+/* The type of parameters selected in key parameter functions */
+# define SELECT_PARAMETERS OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
+
 int EVP_PKEY_bits(const EVP_PKEY *pkey)
 {
     if (pkey != NULL) {
@@ -142,8 +145,7 @@ int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 
     /* For purely provided keys, we just call the keymgmt utility */
     if (to->keymgmt != NULL && from->keymgmt != NULL)
-        return evp_keymgmt_util_copy(to, (EVP_PKEY *)from,
-                                     OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
+        return evp_keymgmt_util_copy(to, (EVP_PKEY *)from, SELECT_PARAMETERS);
 
     /*
      * If |to| is provided, we know that |from| is legacy at this point.
@@ -165,7 +167,7 @@ int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
             return 0;
         }
         return evp_keymgmt_copy(to->keymgmt, to->keydata, from_keydata,
-                                OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
+                                SELECT_PARAMETERS);
     }
 
     /* Both keys are legacy */
@@ -179,8 +181,7 @@ int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
 {
     if (pkey != NULL) {
         if (pkey->keymgmt != NULL)
-            return !evp_keymgmt_util_has((EVP_PKEY *)pkey,
-                                         OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
+            return !evp_keymgmt_util_has((EVP_PKEY *)pkey, SELECT_PARAMETERS);
         else if (pkey->ameth != NULL && pkey->ameth->param_missing != NULL)
             return pkey->ameth->param_missing(pkey);
     }
@@ -258,7 +259,7 @@ int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
      */
 
     if (a->keymgmt != NULL || b->keymgmt != NULL)
-        return evp_pkey_cmp_any(a, b, OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
+        return evp_pkey_cmp_any(a, b, SELECT_PARAMETERS);
 
     /* All legacy keys */
     if (a->type != b->type)
@@ -276,9 +277,8 @@ int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
      */
 
     if (a->keymgmt != NULL || b->keymgmt != NULL)
-        return evp_pkey_cmp_any(a, b,
-                                OSSL_KEYMGMT_SELECT_ALL_PARAMETERS
-                                | OSSL_KEYMGMT_SELECT_PUBLIC_KEY);
+        return evp_pkey_cmp_any(a, b, (SELECT_PARAMETERS
+                                       | OSSL_KEYMGMT_SELECT_PUBLIC_KEY));
 
     /* All legacy keys */
     if (a->type != b->type)