1 files changed, 81 insertions, 0 deletions

diff --git a/src/md5.h b/src/md5.h
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+#ifndef MD5_H
+#define MD5_H
+
+/**
+ * Used to store an MD5 sum in a handy container.
+ */
+typedef struct
+{
+        /** The actual data-storage for an MD5 sum. */
+        long data[4];
+} md5sum;
+
+/**
+ * Class for easily calculating MD5 sums of just about any data.
+ *@author Mike Buland
+ */
+class md5
+{
+public:
+        /** Build an MD5 sum builder. */
+        md5();
+
+        /** Deconstruct */
+        ~md5();
+
+        /**
+         * Create a sum of a standard c string, null terminated.  This is probably
+         * the easiest function to use.
+         *@param pSum The MD5 sum structure to fill up.
+         *@param sStr The null-terminated string to turn into an MD5 sum.
+         */
+        void sumString( md5sum *pSum, const char *sStr );
+
+        /**
+         * Create a sum of an array of arbitrary data.  This is the most handy for
+         * dealing with files and so on.
+         *@param pSum The MD5 sum structure to fill up.
+         *@param aData A pointer to the base of the data to sum.
+         *@param nLen The number of bytes to use in the sum.
+         */
+        void sumData( md5sum *pSum, const char *aData, long nLen );
+
+        /**
+         * Convert an md5sum to standard hex representation.  Make sure that sHex
+         * contains at least 17 characters of space.
+         *@param pSum The sum structure to convert to hex.
+         *@param sHex The string to store the hex value in.
+         */
+        void sumToHex( md5sum *pSum, char *sHex );
+
+private:
+        /**
+         * Do the bulk of the work of the md5 algorithm.
+         *@param x I'm not sure.  I'll need to look it up.
+         *@param len The length of the data.
+         *@param output The sum structure to put the output in.
+         */
+        void core_md5( long *x, long len, md5sum *output );
+
+        /**
+         * Convert an array of charaters to an array of longs in a very crafty way.
+         * This also applies standard MD5 obfuscation to the resulting array, and
+         * makes it fit within MD5 size constraints.
+         *@param str The data to convert.
+         *@param len The length of the data.
+         *@param nNewLen A pointer to a variable that will hold the new length of
+         * the resulting array of longs.
+         *@returns The newly obfuscated and resized long array.
+         */
+        long *c2l( const char *str, long len, long *nNewLen );
+
+        /**
+         * Backend helper to convert an array of longs into a hex string.
+         *@param binarray The binary data to convert.
+         *@param str The string to store the hex string in.
+         */
+        void l2hexstr( long *binarray, char *str );
+        
+};
+
+#endif