Add files via upload

source/par1j/phmd5.h

@@ -0,0 +1,59 @@
+/*----------------------------------------------------------------------------
+;
+; MD5 hash generator -- Paul Houle (paulhoule.com) 11/13/2017
+;
+; This code is in the public domain.  Please attribute the author.
+;
+; There are a lot of MD5 generators; here's another.  This one targets a
+; little-endian memory architecture only (eg X86).  The benefit of this
+; is speed -- bytes within larger elements never need to be reversed,
+; which means the source data can be processed in-place.
+;
+; Though other compilers might be usable, this was developed using
+; Microsoft 32/64-bit C 12.0 [Version 18.00.30723].  Vendor specific
+; definitions (eg. _rotl, __int32, __int64) are used.
+; Build commands:
+;
+;	cl /c /Ox phmd5.c
+;	cl /c /Ox phmd5a.c
+;
+; Link the resulting .obj's into your executable and #include "phmd5.h"
+;
+; How to call the routines to generate a hash:
+;
+;	(1) Allocate a PHMD5 type struct -- it's small, can be static or local.
+;		A pointer to this struct is the first argument to all functions.
+;
+;	(2) Call Phmd5Begin() once -- this initializes the PHMD5 struct.
+;
+;	(3) Call Phmd5Process() as many times as necessary for all data
+;		to be included in the MD5 hash.
+;
+;	(4) Call Phmd5End() once.  The final 16-byte MD5 hash will then be
+;		available in PHMD5->hash.  Note the finished hash is a simple array
+;		of bytes, and must be treated/displayed/copied/etc that way.
+;
+; For best performance the Phmd5Process() "pdata" pointer should be 32-bit
+; aligned (a multiple of 4) and "bytecnt" should be a multiple of 64.
+; As long as both of these conditions continue to be met the input data is
+; processed in-place; otherwise, some speed (10-15%) is lost as the data
+; is copied to an internal blocking buffer before being proceessed.
+;
+;---------------------------------------------------------------------------*/
+
+#ifndef _PHMD5_DEFINED					// include guard
+#define _PHMD5_DEFINED
+
+#include <stddef.h>
+typedef struct {
+	unsigned char hash[16];				// final 16-byte hash winds up here
+	unsigned __int64 totbyt;			// processed byte count
+	char buf[64];						// input blocking buffer
+} PHMD5;
+
+void Phmd5Begin(PHMD5 *pmd5);
+void Phmd5Process(PHMD5 *pmd5, char *pdata, size_t bytecnt);
+void Phmd5End(PHMD5 *pmd5);
+void Phmd5DoBlocks(unsigned char *hash, char *pdata, size_t bytecnt);
+
+#endif