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+/**
+ ********************************************************************
+ * @file    util_md5.h
+ * @brief   This is the header file for "util_md5.c", defining the structure and
+ * (exported) function prototypes.
+ *
+ * @copyright (c) 2021 DJI. All rights reserved.
+ *
+ * All information contained herein is, and remains, the property of DJI.
+ * The intellectual and technical concepts contained herein are proprietary
+ * to DJI and may be covered by U.S. and foreign patents, patents in process,
+ * and protected by trade secret or copyright law.  Dissemination of this
+ * information, including but not limited to data and other proprietary
+ * material(s) incorporated within the information, in any form, is strictly
+ * prohibited without the express written consent of DJI.
+ *
+ * If you receive this source code without DJI’s authorization, you may not
+ * further disseminate the information, and you must immediately remove the
+ * source code and notify DJI of its removal. DJI reserves the right to pursue
+ * legal actions against you for any loss(es) or damage(s) caused by your
+ * failure to do so.
+ *
+ * crypto-algorithms
+ * =================
+ *
+ * About
+ * ---
+ * These are basic implementations of standard cryptography algorithms, written by Brad Conte (brad@bradconte.com) from
+ * scratch and without any cross-licensing. They exist to provide publically accessible, restriction-free implementations
+ * of popular cryptographic algorithms, like AES and SHA-1. These are primarily intended for educational and pragmatic
+ * purposes (such as comparing a specification to actual implementation code, or for building an internal application
+ * that computes test vectors for a product). The algorithms have been tested against standard test vectors.
+ * This code is released into the public domain free of any restrictions. The author requests acknowledgement if the code
+ * is used, but does not require it. This code is provided free of any liability and without any quality claims by the
+ * author.
+ * Note that these are *not* cryptographically secure implementations. They have no resistence to side-channel attacks
+ * and should not be used in contexts that need cryptographically secure implementations.
+ * These algorithms are not optimized for speed or space. They are primarily designed to be easy to read, although some
+ * basic optimization techniques have been employed.
+ * Building
+ * ---
+ * The source code for each algorithm will come in a pair of a source code file and a header file. There should be no
+ * inter-header file dependencies, no additional libraries, no platform-specific header files, or any other complicating
+ * matters. Compiling them should be as easy as adding the relevent source code to the project.
+ *
+ * @statement DJI has modified some symbols' name.
+ *
+ *********************************************************************
+ */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef UTIL_MD5_H
+#define UTIL_MD5_H
+
+/* Includes ------------------------------------------------------------------*/
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Exported constants --------------------------------------------------------*/
+#define MD5_BLOCK_SIZE 16               // MD5 outputs a 16 byte digest
+
+/* Exported types ------------------------------------------------------------*/
+typedef unsigned char BYTE;             // 8-bit byte
+typedef unsigned int WORD;              // 32-bit word, change to "long" for 16-bit machines
+
+typedef struct {
+    BYTE data[64];
+    WORD datalen;
+    unsigned long long bitlen;
+    WORD state[4];
+} MD5_CTX;
+
+/* Exported functions --------------------------------------------------------*/
+void UtilMd5_Init(MD5_CTX *ctx);
+void UtilMd5_Update(MD5_CTX *ctx, const BYTE *data, size_t len);
+void UtilMd5_Final(MD5_CTX *ctx, BYTE *hash);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // UTIL_MD5_H
+/************************ (C) COPYRIGHT DJI Innovations *******END OF FILE******/