Allow user to prevent wc_PKCS7_EcdsaVerify from erroring out due to extentions we do not know about

Author: anhu

wolfcrypt/src/pkcs7.c

@@ -4174,6 +4174,14 @@ static int wc_PKCS7_EcdsaVerify(wc_PKCS7* pkcs7, byte* sig, int sigSz,
         }
 
         InitDecodedCert(dCert, pkcs7->cert[i], pkcs7->certSz[i], pkcs7->heap);
+
+        /* This allows the user to not error out in the case of extensions that
+         * we are not aware of. */
+#ifdef WC_ASN_UNKNOWN_EXT_CB
+        if (pkcs7->unknownExtCallback != NULL)
+            wc_SetUnknownExtCallback(dCert, pkcs7->unknownExtCallback);
+#endif
+
         /* not verifying, only using this to extract public key */
         ret = ParseCert(dCert, CA_TYPE, NO_VERIFY, 0);
         if (ret < 0) {