Diff: targets/TARGET_Maxim/TARGET_MAX32625/mxc/prng.h

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/prng.h	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,110 @@
+/*******************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *
+ * $Date: 2016-03-11 11:46:37 -0600 (Fri, 11 Mar 2016) $
+ * $Revision: 21839 $
+ *
+ ******************************************************************************/
+
+/**
+ * @file    prng.h
+ * @brief   Pseudo-random number generator(PRNG) driver header file.
+ * @note  The PRNG hardware does not produce true random numbers. The output
+ *        should be used as a seed to an approved random-number algorithm, per
+ *        a certifying authority such as NIST or PCI. The approved algorithm
+ *        will output random numbers which are cerfitied for use in encryption
+ *        and authentication algorithms.
+ */
+
+#ifndef _PRNG_H_
+#define _PRNG_H_
+
+/***** Includes *****/
+#include "prng_regs.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/***** Definitions *****/
+
+/***** Globals *****/
+
+/***** Function Prototypes *****/
+
+/**
+ * @brief Initialize required clocks and enable PRNG module
+ * @note  Function will set divisors to /1 if they are found disabled.
+ *        Otherwise, it will not change the divisor.
+ */
+void PRNG_Init(void);
+
+/**
+ * @brief   Returns ready bit to indicates that the PRNG_GetSeed can be called without
+ *          being held off. Only needs to be called after POR.
+ *
+ * @return  0 - PRNG not ready, non-zero = PRNG ready to read
+ */
+__STATIC_INLINE uint16_t PRNG_Ready(void)
+{
+    return (MXC_PRNG->user_entropy & MXC_F_PRNG_USER_ENTROPY_RND_NUM_READY);
+}
+
+/**
+ * @brief Retrieve a seed value from the PRNG
+ * @note  The PRNG hardware does not produce true random numbers. The output
+ *        should be used as a seed to an approved random-number algorithm, per
+ *        a certifying authority such as NIST or PCI. The approved algorithm
+ *        will output random numbers which are cerfitied for use in encryption
+ *        and authentication algorithms.
+ *
+ * @return This function returns a 16-bit seed value
+ */
+__STATIC_INLINE uint16_t PRNG_GetSeed(void)
+{
+    return MXC_PRNG->rnd_num;
+}
+
+/**
+ * @brief Add user entropy to the PRNG entropy source
+ *
+ * @param entropy    This value will be mixed into the PRNG entropy source
+ */
+__STATIC_INLINE void PRNG_AddUserEntropy(uint8_t entropy)
+{
+    MXC_PRNG->user_entropy = (uint32_t)entropy;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _PRNG_H_ */