From 11e3552c9f0ee3c64408c083794c310d3d2c5640 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@samba.org>
Date: Mon, 4 Mar 2019 16:53:39 +0100
Subject: [PATCH] libcli:smb: Introduce a structure for the smb2_singing_key

This also adds a new function to validate the structure.

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
---
 libcli/smb/smb2_signing.c | 13 +++++++++++++
 libcli/smb/smb2_signing.h | 10 ++++++++++
 2 files changed, 23 insertions(+)

diff --git a/libcli/smb/smb2_signing.c b/libcli/smb/smb2_signing.c
index 11168170a5b..c2a86b850e0 100644
--- a/libcli/smb/smb2_signing.c
+++ b/libcli/smb/smb2_signing.c
@@ -27,6 +27,19 @@
 #include <gnutls/gnutls.h>
 #include <gnutls/crypto.h>
 
+bool smb2_signing_key_valid(const struct smb2_signing_key *key)
+{
+	if (key == NULL) {
+		return false;
+	}
+
+	if (key->blob.length == 0 || key->blob.data == NULL) {
+		return false;
+	}
+
+	return true;
+}
+
 NTSTATUS smb2_signing_sign_pdu(DATA_BLOB signing_key,
 			       enum protocol_types protocol,
 			       struct iovec *vector,
diff --git a/libcli/smb/smb2_signing.h b/libcli/smb/smb2_signing.h
index 107af5bac1e..668e48ae124 100644
--- a/libcli/smb/smb2_signing.h
+++ b/libcli/smb/smb2_signing.h
@@ -21,8 +21,18 @@
 #ifndef _LIBCLI_SMB_SMB2_SIGNING_H_
 #define _LIBCLI_SMB_SMB2_SIGNING_H_
 
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
 struct iovec;
 
+struct smb2_signing_key {
+	gnutls_hmac_hd_t hmac_hnd;
+	DATA_BLOB blob;
+};
+
+bool smb2_signing_key_valid(const struct smb2_signing_key *key);
+
 NTSTATUS smb2_signing_sign_pdu(DATA_BLOB signing_key,
 			       enum protocol_types protocol,
 			       struct iovec *vector,