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diff --git a/test/monniaux/crypto-algorithms/base64.h b/test/monniaux/crypto-algorithms/base64.h
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+++ b/test/monniaux/crypto-algorithms/base64.h
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+/*********************************************************************
+* Filename:   base64.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 Base64 implementation.
+*********************************************************************/
+
+#ifndef BASE64_H
+#define BASE64_H
+
+/*************************** HEADER FILES ***************************/
+#include <stddef.h>
+
+/**************************** DATA TYPES ****************************/
+typedef unsigned char BYTE;             // 8-bit byte
+
+/*********************** FUNCTION DECLARATIONS **********************/
+// Returns the size of the output. If called with out = NULL, will just return
+// the size of what the output would have been (without a terminating NULL).
+size_t base64_encode(const BYTE in[], BYTE out[], size_t len, int newline_flag);
+
+// Returns the size of the output. If called with out = NULL, will just return
+// the size of what the output would have been (without a terminating NULL).
+size_t base64_decode(const BYTE in[], BYTE out[], size_t len);
+
+#endif   // BASE64_H