diff --git a/jni/libzrtp/sources/srtp/crypto/sha1.h b/jni/libzrtp/sources/srtp/crypto/sha1.h
new file mode 100644
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+++ b/jni/libzrtp/sources/srtp/crypto/sha1.h
@@ -0,0 +1,73 @@
+/*
+ ---------------------------------------------------------------------------
+ Copyright (c) 2002, Dr Brian Gladman, Worcester, UK.   All rights reserved.
+
+ LICENSE TERMS
+
+ The free distribution and use of this software in both source and binary
+ form is allowed (with or without changes) provided that:
+
+   1. distributions of this source code include the above copyright
+      notice, this list of conditions and the following disclaimer;
+
+   2. distributions in binary form include the above copyright
+      notice, this list of conditions and the following disclaimer
+      in the documentation and/or other associated materials;
+
+   3. the copyright holder's name is not used to endorse products
+      built using this software without specific written permission.
+
+ ALTERNATIVELY, provided that this notice is retained in full, this product
+ may be distributed under the terms of the GNU General Public License (GPL),
+ in which case the provisions of the GPL apply INSTEAD OF those given above.
+
+ DISCLAIMER
+
+ This software is provided 'as is' with no explicit or implied warranties
+ in respect of its properties, including, but not limited to, correctness
+ and/or fitness for purpose.
+ ---------------------------------------------------------------------------
+ Issue Date: 01/08/2005
+*/
+
+#ifndef _SHA1_H
+#define _SHA1_H
+
+#include <stdlib.h>
+#include <cryptcommon/brg_types.h>
+
+#define SHA1_BLOCK_SIZE  64
+#define SHA1_DIGEST_SIZE 20
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+/* type to hold the SHA256 context  */
+
+typedef struct
+{   uint_32t count[2];
+    uint_32t hash[5];
+    uint_32t wbuf[16];
+} sha1_ctx;
+
+/* Note that these prototypes are the same for both bit and */
+/* byte oriented implementations. However the length fields */
+/* are in bytes or bits as appropriate for the version used */
+/* and bit sequences are input as arrays of bytes in which  */
+/* bit sequences run from the most to the least significant */
+/* end of each byte                                         */
+
+VOID_RETURN sha1_compile(sha1_ctx ctx[1]);
+
+VOID_RETURN sha1_begin(sha1_ctx ctx[1]);
+VOID_RETURN sha1_hash(const unsigned char data[], unsigned long len, sha1_ctx ctx[1]);
+VOID_RETURN sha1_end(unsigned char hval[], sha1_ctx ctx[1]);
+VOID_RETURN sha1(unsigned char hval[], const unsigned char data[], unsigned long len);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif