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+/*
+ * 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 __SHA1HMAC_H__
+#define __SHA1HMAC_H__
+
+/* Implementation of SHA1-HMAC. We're rolling our own just to
+ * double-check that the calls libotr makes to libgcrypt are in fact
+ * doing the right thing. */
+void sha1hmac(unsigned char digest[20], unsigned char key[20],
+ unsigned char *data, size_t datalen);
+
+#endif