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1 /* $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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