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1 dashley 25 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_md5.h,v 1.8 2002/05/15 04:06:04 dtashley Exp $
2     **
3     ** This is the ESRG version of the MD5 message digest algorithm. Please
4     ** see RFC 1321 for all details of the algorithm. This is a fully original
5     ** implementation done directly from the RFC, so it is free of all licensing
6     ** issues. Note that this module is under the GNU GPL, so it may be used
7     ** more-or-less freely.
8     **
9     ** Note that although R. Rivest's documentation and algorithm allow for something
10     ** whose MD5 is formed to not consist of an integral number of bytes,
11     ** this software module does not allow for this. Anything put through
12     ** the implementation in this software module must be an integral number
13     ** of bytes.
14     **
15     ** The fundamental paradigm of this module is that one opens (or initializes
16     ** the MD5 data structure, then puts data through it, then closes the data
17     ** structure and extracts the MD5. Note that multiple extracts are not
18     ** allowed--the close operation is final and data may not be added after
19     ** the close.
20     **
21     ** No dynamic memory is allocated by this module.
22     **
23     ** This module was speed tested against "md5sum -b" that comes with CygWin.
24     ** For a file approximately 550M, CygWin took 48 seconds but the widget
25     ** using this module took 41. So, they are in the same speed ballpark
26     ** but there are probably still possible speed optimizations. However,
27     ** there is no intent to spend a lot of effort to get an extra 20% out of
28     ** this module.
29     */
31     //--------------------------------------------------------------------------------
32     //Copyright 2001 David T. Ashley
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711     //-------------------------------------------------------------------------------------------------
712     //--------------------------------------------------------------------------------
713     #ifndef ESRG_MD5_H_INCLUDED
714     #define ESRG_MD5_H_INCLUDED
716     #ifdef MODULE_ESRG_MD5
717     #define DECMOD_ESRG_MD5
718     #else
719     #define DECMOD_ESRG_MD5 extern
720     #endif
722     //Fundamental state (or RFC 1321 calls it context) for forming
723     //MD5s. Conceptually private to this module.
724     struct ESRG_MD5_Md5StateStruct
725     {
726     unsigned A, B, C, D;
727     //Directly from RFC 1321.
728     unsigned __int64 bit_count;
729     //The count of bits processed thus far. The algorithm here
730     //works in bytes, not bits, so this is advanced by 8 on
731     //each byte processed.
732     unsigned X[16];
733     //These are the words corresponding to the chars. We don't
734     //dare union them because of big-endian/little-endian concerns.
735     //The name "X" comes directly from RFC 1321 nomenclature.
736     unsigned char buf[64];
737     //We can't proceed to execute a round unless we have the
738     //full 512 bits = 16 words = 64 bytes of data. We must
739     //buffer it because we can't count on being called with data
740     //blocks that are a multiple of 64. We may have data hanging
741     //around between calls. We fill up this buffer from the low
742     //end, i.e. [0], then [1], then [2], etc.
743     };
745     //Result structure, used to hold result. Caller is allowed to
746     //pick it apart.
747     struct ESRG_MD5_Md5ResultStruct
748     {
749     unsigned md5_words[4];
750     char md5_chars[33];
751     //Zero terminated string containing MD5 formed.
752     };
754     //Initializes the MD5 calculation structure.
756     void ESRG_MD5_Md5StateStructOpen(struct ESRG_MD5_Md5StateStruct *arg);
758     //Adds data to it. Zero length is OK.
760     void ESRG_MD5_Md5StateStructAddData(struct ESRG_MD5_Md5StateStruct *arg,
761     void *data,
762     unsigned len);
764     //Closes the structure and returns the MD5. This is destructive--one cannot
765     //continue adding characters. All characters returned are lower-case.
767     void ESRG_MD5_Md5StateStructClose(struct ESRG_MD5_Md5StateStruct *state,
768     struct ESRG_MD5_Md5ResultStruct *result);
770     //Returns version control information.
771     DECMOD_ESRG_MD5 const char *ESRG_MD5_cvcinfo(void);
772     DECMOD_ESRG_MD5 const char *ESRG_MD5_hvcinfo(void);
774     //Definition of the version of the H file, used for providing version control
775     //information to external callers.
776     #define ESRG_MD5_H_VERSION ("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_md5.h,v 1.8 2002/05/15 04:06:04 dtashley Exp $")
778     #endif
780     /***************************************************************************
781     ** $Log: esrg_md5.h,v $
782     ** Revision 1.8 2002/05/15 04:06:04 dtashley
783     ** Minor documentation correction.
784     **
785     ** Revision 1.7 2002/05/15 04:02:58 dtashley
786     ** Finished with reviews. Ready for testing.
787     **
788     ** Revision 1.6 2002/05/14 22:17:26 dtashley
789     ** MD5 now has the major speed hurdles taken care of. Had to use
790     ** macros to put everything inline for speed. Need to check in for
791     ** safety before final edits and trimming. MD5 seems to be working
792     ** correctly.
793     **
794     ** Revision 1.5 2002/05/01 21:51:44 dtashley
795     ** Completion of MD5 implementation. Implementation does not work correctly,
796     ** and need to debug. Noticed in MD5 result that first hex digit of MD5 digest
797     ** is always "8"--this is definitely a problem as this can't happen in practice.
798     ** Checking in for baseline to debug.
799     **
800     ** Revision 1.4 2002/05/01 08:15:48 dtashley
801     ** Evening safety checkin.
802     **
803     ** Revision 1.3 2002/05/01 08:01:20 dtashley
804     ** Test of keyword expansion for VC functions.
805     **
806     ** Revision 1.2 2002/04/30 09:14:26 dtashley
807     ** Evening safety checkin.
808     **
809     ** Revision 1.1 2002/04/30 09:05:38 dtashley
810     ** Initial checkin.
811     ****************************************************************************
812     ** End of ESRG_MD5.H. */

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