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diff --git a/lib/crypto-algorithms/arcfour.h b/lib/crypto-algorithms/arcfour.h
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+++ b/lib/crypto-algorithms/arcfour.h
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+/*********************************************************************
+* Filename:   arcfour.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 ARCFOUR implementation.
+*********************************************************************/
+
+#ifndef ARCFOUR_H
+#define ARCFOUR_H
+
+/*************************** HEADER FILES ***************************/
+#include <stddef.h>
+
+/**************************** DATA TYPES ****************************/
+typedef unsigned char BYTE;             // 8-bit byte
+
+/*********************** FUNCTION DECLARATIONS **********************/
+// Input: state - the state used to generate the keystream
+//        key - Key to use to initialize the state
+//        len - length of key in bytes (valid lenth is 1 to 256)
+void arcfour_key_setup(BYTE state[], const BYTE key[], int len);
+
+// Pseudo-Random Generator Algorithm
+// Input: state - the state used to generate the keystream
+//        out - Must be allocated to be of at least "len" length
+//        len - number of bytes to generate
+void arcfour_generate_stream(BYTE state[], BYTE out[], size_t len);
+
+#endif   // ARCFOUR_H