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diff --git a/lib/libutee/include/tee_arith_internal.h b/lib/libutee/include/tee_arith_internal.h
new file mode 100644
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+++ b/lib/libutee/include/tee_arith_internal.h
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+/*
+ * Copyright (c) 2014, STMicroelectronics International N.V.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef GUARD_TEE_MATHAPI_H
+#define GUARD_TEE_MATHAPI_H
+
+#include <stddef.h>		/* for size_t */
+#include <stdint.h>		/* for uint32_t and friends */
+#include <stdbool.h>		/* for bool (!) */
+
+/*************************************************************
+ *
+ *  MACRO DEFINITIONS
+ *
+ *************************************************************/
+
+/*------------------------------------------------------------
+ *
+ *  How functions are exported
+ *
+ */
+#define TEE_MATHAPI_EXPORT
+
+/*
+ * The modes for String Conversion
+ */
+#define TEE_STRING_MODE_HEX_UC MPA_STRING_MODE_HEX_UC
+#define TEE_STRING_MODE_HEX_LC MPA_STRING_MODE_HEX_UC
+
+/*------------------------------------------------------------
+ *
+ *  Define IN, OUT, INBUF and OUTBUF to keep format from the spec.
+ *
+ */
+#define IN const
+#define OUT
+#define INOUT
+#define INBUF const
+#define OUTBUF
+
+/*************************************************************
+ *
+ *  MEMORY ALLOCATION AND SIZE
+ *
+ *************************************************************/
+
+/*
+ * THIS IS THE MAXIMUM NUMBER OF BITS THAT THE LIBRARY SUPPORTS.
+ * It defines the size of the scratch memory pool for the underlying
+ * mpa library.
+ */
+#define TEE_MAX_NUMBER_OF_SUPPORTED_BITS 2048
+
+/*************************************************************
+ *
+ * INITIALIZATION FUNCTIONS
+ *
+ *************************************************************/
+
+/*
+ * !!! This function must be called before you do anything else !!!
+ *  NOTE: Not part of the spec
+ */
+TEE_MATHAPI_EXPORT void _TEE_MathAPI_Init(void);
+
+/* this function generate a syscall to teecore for random number
+ * generation, this is supplied to libmpa. Thus libmpa linked with user
+ * TA can use this function to get random number.
+ */
+TEE_Result get_rng_array(void *buf, size_t blen);
+
+#endif