* #35924 (zrtp): switch to libzrtpcpp
diff --git a/jni/libzrtp/sources/zrtp/crypto/skeinMac256.h b/jni/libzrtp/sources/zrtp/crypto/skeinMac256.h
new file mode 100644
index 0000000..e87a1e1
--- /dev/null
+++ b/jni/libzrtp/sources/zrtp/crypto/skeinMac256.h
@@ -0,0 +1,91 @@
+/*
+ Copyright (C) 2013 Werner Dittmann
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+*/
+
+/**
+ * Methods to compute a Skein256 HMAC.
+ *
+ * @author Werner Dittmann <Werner.Dittmann@t-online.de>
+ */
+
+#ifndef HMAC_SKEIN256_H
+#define HMAC_SKEIN256_H
+
+/**
+ * @file skeinMac256.h
+ * @brief Function that provide Skein256 HMAC support
+ *
+ * @ingroup GNU_ZRTP
+ * @{
+ */
+
+#include <stdint.h>
+
+#ifndef SKEIN256_DIGEST_LENGTH
+#define SKEIN256_DIGEST_LENGTH 32
+#endif
+
+#define SKEIN_SIZE Skein512
+
+/**
+ * Compute Skein256 HMAC.
+ *
+ * This functions takes one data chunk and computes its Skein256 HMAC.
+ *
+ * @param key
+ * The MAC key.
+ * @param key_length
+ * Lneght of the MAC key in bytes
+ * @param data
+ * Points to the data chunk.
+ * @param data_length
+ * Length of the data in bytes
+ * @param mac
+ * Points to a buffer that receives the computed digest. This
+ * buffer must have a size of at least 32 bytes (SKEIN256_DIGEST_LENGTH).
+ * @param mac_length
+ * Point to an integer that receives the length of the computed HMAC.
+ */
+void macSkein256( uint8_t* key, uint32_t key_length, uint8_t* data, int32_t data_length, uint8_t* mac, uint32_t* mac_length );
+
+/**
+ * Compute Skein256 HMAC over several data cunks.
+ *
+ * This functions takes several data chunk and computes the Skein256 HAMAC.
+ *
+ * @param key
+ * The MAC key.
+ * @param key_length
+ * Lneght of the MAC key in bytes
+ * @param data
+ * Points to an array of pointers that point to the data chunks. A NULL
+ * pointer in an array element terminates the data chunks.
+ * @param data_length
+ * Points to an array of integers that hold the length of each data chunk.
+ * @param mac
+ * Points to a buffer that receives the computed digest. This
+ * buffer must have a size of at least 32 bytes (SKEIN256_DIGEST_LENGTH).
+ * @param mac_length
+ * Point to an integer that receives the length of the computed HMAC.
+ */
+
+void macSkein256( uint8_t* key, uint32_t key_length, uint8_t* data[], uint32_t data_length[], uint8_t* mac, uint32_t* mac_length );
+/**
+ * @}
+ */
+#endif