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1 /* $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 */
30
31 //--------------------------------------------------------------------------------
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711 //-------------------------------------------------------------------------------------------------
712 //--------------------------------------------------------------------------------
713 #ifndef ESRG_MD5_H_INCLUDED
714 #define ESRG_MD5_H_INCLUDED
715
716 #ifdef MODULE_ESRG_MD5
717 #define DECMOD_ESRG_MD5
718 #else
719 #define DECMOD_ESRG_MD5 extern
720 #endif
721
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 };
744
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 };
753
754 //Initializes the MD5 calculation structure.
755 DECMOD_ESRG_MD5
756 void ESRG_MD5_Md5StateStructOpen(struct ESRG_MD5_Md5StateStruct *arg);
757
758 //Adds data to it. Zero length is OK.
759 DECMOD_ESRG_MD5
760 void ESRG_MD5_Md5StateStructAddData(struct ESRG_MD5_Md5StateStruct *arg,
761 void *data,
762 unsigned len);
763
764 //Closes the structure and returns the MD5. This is destructive--one cannot
765 //continue adding characters. All characters returned are lower-case.
766 DECMOD_ESRG_MD5
767 void ESRG_MD5_Md5StateStructClose(struct ESRG_MD5_Md5StateStruct *state,
768 struct ESRG_MD5_Md5ResultStruct *result);
769
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);
773
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 $")
777
778 #endif
779
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. */

dashley@gmail.com
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