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diff --git a/src/stlink-lib/lib_md5.h b/src/stlink-lib/lib_md5.h
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+/*
+ * WjCryptLib_Md5 (https://github.com/WaterJuice/WjCryptLib)
+ * Implementation of MD5 hash function. Originally written by Alexander Peslyak.
+ * Modified by WaterJuice retaining Public Domain license.
+ * This is free and unencumbered software released into the public domain - June 2013 - waterjuice.org
+ */
+
+#ifndef LIB_MD5_H
+#define LIB_MD5_H
+
+#pragma once
+
+/* TYPES */
+
+/* Md5Context
+ * This must be initialised using Md5Initialised.
+ * Do not modify the contents of this structure directly.
+ */
+typedef struct {
+    uint32_t lo;
+    uint32_t hi;
+    uint32_t a;
+    uint32_t b;
+    uint32_t c;
+    uint32_t d;
+    uint8_t buffer[64];
+    uint32_t block[16];
+} Md5Context;
+
+#define MD5_HASH_SIZE (128 / 8)
+
+typedef struct {
+    uint8_t bytes [MD5_HASH_SIZE];
+} MD5_HASH;
+
+/* PUBLIC FUNCTIONS */
+
+/* Md5Initialise
+ * Initialises an MD5 Context.
+ * Use this to initialise/reset a context.
+ */
+void Md5Initialise(Md5Context* Context /* [out] */);
+
+/* Md5Update
+ * Adds data to the MD5 context.
+ * This will process the data and update the internal state of the context.
+ * Keep on calling this function until all the data has been added.
+ * Then call Md5Finalise to calculate the hash.
+ */
+void Md5Update(Md5Context* Context /* [in out] */, void const* Buffer /* [in] */, uint32_t BufferSize /* [in] */);
+
+/* Md5Finalise
+ * Performs the final calculation of the hash and returns the digest
+ * (16 byte buffer containing 128bit hash).
+ * After calling this, Md5Initialised must be used to reuse the context.
+ */
+void Md5Finalise(Md5Context* Context /* [in out] */, MD5_HASH* Digest /* [in] */);
+
+/* Md5Calculate
+ * Combines Md5Initialise, Md5Update, and Md5Finalise into one function.
+ * Calculates the MD5 hash of the buffer.
+ */
+void Md5Calculate(void const* Buffer /* [in] */, uint32_t BufferSize /* [in] */, MD5_HASH* Digest /* [in] */);
+
+#endif // LIB_MD5_H
+\ No newline at end of file