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diff --git a/lib/crypto-algorithms/md5.h b/lib/crypto-algorithms/md5.h
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+/*********************************************************************
+* Filename:   md5.h
+* Author:     Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details:    Defines the API for the corresponding MD5 implementation.
+*********************************************************************/
+
+#ifndef MD5_H
+#define MD5_H
+
+/*************************** HEADER FILES ***************************/
+#include <stddef.h>
+
+/****************************** MACROS ******************************/
+#define MD5_BLOCK_SIZE 16               // MD5 outputs a 16 byte digest
+
+/**************************** DATA 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;
+
+/*********************** FUNCTION DECLARATIONS **********************/
+void md5_init(MD5_CTX *ctx);
+void md5_update(MD5_CTX *ctx, const BYTE data[], size_t len);
+void md5_final(MD5_CTX *ctx, BYTE hash[]);
+
+#endif   // MD5_H