diff --git a/client/src/cipurse/cipursecrypto.c b/client/src/cipurse/cipursecrypto.c
new file mode 100644
index 000000000..0f928ea1e
--- /dev/null
+++ b/client/src/cipurse/cipursecrypto.c
@@ -0,0 +1,23 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2021 Merlok
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// CIPURSE crypto primitives
+//-----------------------------------------------------------------------------
+
+#include "cipursecore.h"
+
+#include "commonutil.h"  // ARRAYLEN
+#include "comms.h"       // DropField
+#include "util_posix.h"  // msleep
+
+#include "cmdhf14a.h"
+#include "emv/emvcore.h"
+#include "emv/emvjson.h"
+#include "ui.h"
+#include "util.h"
+
+
diff --git a/client/src/cipurse/cipursecrypto.h b/client/src/cipurse/cipursecrypto.h
new file mode 100644
index 000000000..f2e0dbfa2
--- /dev/null
+++ b/client/src/cipurse/cipursecrypto.h
@@ -0,0 +1,42 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2021 Merlok
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// CIPURSE crypto primitives
+//-----------------------------------------------------------------------------
+
+#ifndef __CIPURSECRYPTO_H__
+#define __CIPURSECRYPTO_H__
+
+#include "common.h"
+
+enum CipurseChannelSecurityLevel {
+    CPSNone,
+    CPSPlain,
+    CPSMACed,
+    CPSEncrypted
+}
+
+struct CipurseSession {
+    uint8_t keyId,
+    uint8_t[16] key,
+    
+    uint8_t[16] RP,
+    uint8_t[6]  rP,
+    uint8_t[16] RT,
+    uint8_t[6]  rT,
+    
+    uint8_t[16] k0,
+    uint8_t[16] cP,
+    
+    uint8_t[16] frameKey,
+    uint8_t[16] frameKey1
+}
+
+
+
+
+#endif /* __CIPURSECRYPTO_H__ */