1 files changed, 29 insertions, 0 deletions
diff --git a/comm/third_party/libotr/toolkit/ctrmode.h b/comm/third_party/libotr/toolkit/ctrmode.h
new file mode 100644
index 0000000000..6ef648fd5a
--- /dev/null
+++ b/comm/third_party/libotr/toolkit/ctrmode.h
@@ -0,0 +1,29 @@
+/*
+ *  Off-the-Record Messaging Toolkit
+ *  Copyright (C) 2004-2012  Ian Goldberg, Chris Alexander, Nikita Borisov
+ *                           <otr@cypherpunks.ca>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of version 2 of the GNU General Public License as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __CTRMODE_H__
+#define __CTRMODE_H__
+
+/* Encrypt or decrypt data in AES-CTR mode.  (The operations are the
+ * same.)  We roll our own here just to double-check that the calls
+ * libotr makes to libgcrypt are doing the right thing. */
+void aes_ctr_crypt(unsigned char *out, const unsigned char *in, size_t len,
+	unsigned char key[16], unsigned char ctrtop[8]);
+
+#endif