diff --git a/src/sk-api.h b/src/sk-api.h
index 2bd5939..2445438 100644
--- a/src/sk-api.h
+++ b/src/sk-api.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: sk-api.h,v 1.11 2020/09/09 03:08:01 djm Exp $ */
+/* $OpenBSD: sk-api.h,v 1.14 2021/11/02 22:56:40 djm Exp $ */
 /*
  * Copyright (c) 2019 Google LLC
  *
@@ -39,6 +39,7 @@
 #define SSH_SK_ERR_DEVICE_NOT_FOUND	-4
 
 struct sk_enroll_response {
+	uint8_t flags;
 	uint8_t *public_key;
 	size_t public_key_len;
 	uint8_t *key_handle;
@@ -66,6 +67,8 @@ struct sk_resident_key {
 	char *application;
 	struct sk_enroll_response key;
 	uint8_t flags;
+	uint8_t *user_id;
+	size_t user_id_len;
 };
 
 struct sk_option {
@@ -86,7 +89,7 @@ int sk_enroll(uint32_t alg, const uint8_t *challenge, size_t challenge_len,
     struct sk_option **options, struct sk_enroll_response **enroll_response);
 
 /* Sign a challenge */
-int sk_sign(uint32_t alg, const uint8_t *message, size_t message_len,
+int sk_sign(uint32_t alg, const uint8_t *data, size_t data_len,
     const char *application, const uint8_t *key_handle, size_t key_handle_len,
     uint8_t flags, const char *pin, struct sk_option **options,
     struct sk_sign_response **sign_response);
@@ -95,4 +98,4 @@ int sk_sign(uint32_t alg, const uint8_t *message, size_t message_len,
 int sk_load_resident_keys(const char *pin, struct sk_option **options,
     struct sk_resident_key ***rks, size_t *nrks);
 
-#endif /* _SK_API_H */
+#endif /* _SK_API_H */
\ No newline at end of file
diff --git a/src/winhello.c b/src/winhello.c
index 6de1a62..4c01377 100644
--- a/src/winhello.c
+++ b/src/winhello.c
@@ -477,7 +477,7 @@ static int pack_sig(uint32_t alg, BYTE *sign, size_t len, struct sk_sign_respons
 }
 
 /* Sign a challenge */
-int sk_sign(uint32_t alg, const uint8_t *message, size_t message_len, const char *application, const uint8_t *key_handle, size_t key_handle_len, uint8_t flags, const char *pin, struct sk_option **options, struct sk_sign_response **sign_response)
+int sk_sign(uint32_t alg, const uint8_t *data, size_t data_len, const char *application, const uint8_t *key_handle, size_t key_handle_len, uint8_t flags, const char *pin, struct sk_option **options, struct sk_sign_response **sign_response)
 {
 	struct sk_sign_response *response = NULL;
 	int ret = SSH_SK_ERR_GENERAL;
@@ -515,7 +515,7 @@ int sk_sign(uint32_t alg, const uint8_t *message, size_t message_len, const char
 		goto out;
 	}
 
-	WEBAUTHN_CLIENT_DATA WebAuthNClientData = {WEBAUTHN_CLIENT_DATA_CURRENT_VERSION, message_len, (uint8_t *)message, WEBAUTHN_HASH_ALGORITHM_SHA_256};
+	WEBAUTHN_CLIENT_DATA WebAuthNClientData = {WEBAUTHN_CLIENT_DATA_CURRENT_VERSION, data_len, (uint8_t *)data, WEBAUTHN_HASH_ALGORITHM_SHA_256};
 
 	BOOL pbU2fAppId = FALSE;
 	WEBAUTHN_CREDENTIAL credential = {WEBAUTHN_CREDENTIAL_CURRENT_VERSION, key_handle_len, (uint8_t *)key_handle, WEBAUTHN_CREDENTIAL_TYPE_PUBLIC_KEY};