/[dtapublic]/projs/trunk/shared_source/c_datd/esrg_sha512.h
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Move shared source code to commonize.
1 dashley 25 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_sha512.h,v 1.4 2009/11/29 02:16:05 dtashley Exp $
2     */
3    
4     //--------------------------------------------------------------------------------
5     //Copyright 2001 David T. Ashley
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684     //-------------------------------------------------------------------------------------------------
685     //--------------------------------------------------------------------------------
686     #ifndef ESRG_SHA512_H_INCLUDED
687     #define ESRG_SHA512_H_INCLUDED
688    
689     #ifdef MODULE_ESRG_SHA512
690     #define DECMOD_ESRG_SHA512
691     #else
692     #define DECMOD_ESRG_SHA512 extern
693     #endif
694    
695     //Fundamental state for forming
696     //SHA-512s. Conceptually private to this module.
697     struct ESRG_SHA512_Sha512StateStruct
698     {
699     unsigned __int64 H0, H1, H2, H3, H4, H5, H6, H7;
700     //Directly from FIPS 180-3. In retrospect, this might have
701     //been better implemented as an array.
702     unsigned __int64 bit_count;
703     //The count of bits processed thus far. The algorithm here
704     //works in bytes, not bits, so this is advanced by 8 on
705     //each byte processed. FIPS 180-3 calls for processing
706     //messages up to length 2^128, but for obvious reasons
707     //we don't do that. 2^64-1 bits is in excess of 2^61-1
708     //bytes, or somewhere around 2,000 terabytes. This
709     //isn't a practical limit with current computer technology.
710     unsigned __int64 M[16];
711     //These are the words corresponding to the chars (below). We don't
712     //dare union to extract them because of big-endian/little-endian concerns.
713     //The "M" nomenclature is from FIPS 180-3. At the time the
714     //SHA-512 rounds are done, the chars (below) are converted to words
715     //(this field) so that the rounds can be done using the words.
716     unsigned char buf[128];
717     //We can't proceed to execute a round unless we have the
718     //full 1024 bits = 16 words = 128 bytes of data. We must
719     //buffer it because we can't count on being called with data
720     //blocks that are a multiple of 128. We may have data hanging
721     //around between calls. We fill up this buffer from the low
722     //end, i.e. [0], then [1], then [2], etc.
723     };
724    
725    
726     //Result structure, used to hold result. Caller is allowed to
727     //pick it apart.
728     struct ESRG_SHA512_Sha512ResultStruct
729     {
730     unsigned __int64 sha512_words[8];
731     //Hash in binary form, as the 64-bit integers.
732     char sha512_chars[129];
733     //Zero terminated string containing MD5 formed.
734     };
735    
736    
737     //Initializes the SHA512 calculation structure.
738     DECMOD_ESRG_SHA512
739     void ESRG_SHA512_Sha512StateStructOpen(struct ESRG_SHA512_Sha512StateStruct *arg);
740    
741     //Adds data to it. Zero length is OK.
742     DECMOD_ESRG_SHA512
743     void ESRG_SHA512_Sha512StateStructAddData(struct ESRG_SHA512_Sha512StateStruct *arg,
744     void *data,
745     unsigned len);
746    
747     //Closes the structure and returns the SHA512. This is destructive--one cannot
748     //continue adding characters. All characters returned are lower-case.
749     DECMOD_ESRG_SHA512
750     void ESRG_SHA512_Sha512StateStructClose(struct ESRG_SHA512_Sha512StateStruct *state,
751     struct ESRG_SHA512_Sha512ResultStruct *result);
752    
753     //Returns version control information.
754     DECMOD_ESRG_SHA512 const char *ESRG_SHA512_cvcinfo(void);
755     DECMOD_ESRG_SHA512 const char *ESRG_SHA512_hvcinfo(void);
756    
757     //Definition of the version of the H file, used for providing version control
758     //information to external callers.
759     #define ESRG_SHA512_H_VERSION ("$Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/c_datd/esrg_sha512.h,v 1.4 2009/11/29 02:16:05 dtashley Exp $")
760    
761     #endif
762    
763     /***************************************************************************
764     ** $Log: esrg_sha512.h,v $
765     ** Revision 1.4 2009/11/29 02:16:05 dtashley
766     ** Passed final review.
767     **
768     ** Revision 1.3 2009/11/28 19:09:02 dtashley
769     ** Appears to be working. Ready for final review and cleanup.
770     **
771     ** Revision 1.2 2009/11/28 06:56:28 dtashley
772     ** Edits.
773     **
774     ** Revision 1.1 2009/11/28 00:09:15 dtashley
775     ** Initial checkin.
776     ****************************************************************************
777     ** End of ESRG_SHA512.H. */

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