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1 dashley 15 /* $Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/lib_c++_c_asm_non_uc/src_os_unix_win/c___app_common/sha1/sha1.h,v 1.5 2007/01/28 07:07:47 dashley Exp $
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681     //-------------------------------------------------------------------------------------------------
682     ** SHA1 Secure Hash C Calculation Module Header File
683     ** Copyright (C)2007 David T. Ashley
684     **
685     ** This program is free software; you can redistribute it and/or
686     ** modify it under the terms of the GNU General Public License
687     ** as published by the Free Software Foundation; either version 2
688     ** of the License, or (at your option) any later version.
689     **
690     ** This program is distributed in the hope that it will be useful,
691     ** but WITHOUT ANY WARRANTY; without even the implied warranty of
692     ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
693     ** GNU General Public License for more details.
694     **
695     ** You should have received a copy of the GNU General Public License
696     ** along with this program; if not, write to the Free Software
697     ** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA,
698     ** 02110-1301, USA.
699     ** --------------------------------------------------------------------------------
700     ** This is an implementation of the SHA1 secure hash algorithm. Please
701     ** see RFC 3174 for all details of the algorithm. This implementation
702     ** is nearly verbatim from the RFC.
703     **
704     ** Note that although the RFC and algorithm allow for something
705     ** whose SHA1 is formed to not consist of an integral number of bytes,
706     ** this software module does not allow for this. Anything put through
707     ** the implementation in this software module must be an integral number
708     ** of bytes.
709     **
710     ** The fundamental paradigm of this module is that one opens (or initializes
711     ** the SHA1 data structure, then puts data through it, then closes the data
712     ** structure and extracts the SHA1. Note that multiple extracts are not
713     ** allowed--the close operation is final and data may not be added after
714     ** the close.
715     **
716     ** No dynamic memory is allocated by this module.
717     **
718     ** This module has not been speed benchmarked.
719     */
720     #ifndef SHA1_H_INCLUDED
721     #define SHA1_H_INCLUDED
722    
723     #include <stdint.h>
724    
725     #ifdef MODULE_SHA1
726     #define DECMOD_SHA1
727     #else
728     #define DECMOD_SHA1 extern
729     #endif
730    
731     //Fundamental state (or RFC 3174 calls it context) for forming
732     //SHA1s. Conceptually private to this module.
733     struct SHA1_Sha1StateStruct
734     {
735     uint32_t A, B, C, D, E;
736     //State of the SHA1 algorithm. In the RFC, this is called
737     //the context. These are H0 through H4, respectively, in
738     //the RFC.
739     uint64_t bit_count;
740     //The count of bits processed thus far. The algorithm here
741     //works in bytes, not bits, so this is advanced by 8 on
742     //each byte processed.
743     uint32_t X[16];
744     //These are the words corresponding to chars below (processing
745     //is done in blocks of 512 bits). We don't union them with the
746     //chars because of endian concerns.
747     unsigned char buf[64];
748     //We can't proceed to execute a round unless we have the
749     //full 512 bits = 16 words = 64 bytes of data. We must
750     //buffer it because we can't count on being called with data
751     //blocks that are a multiple of 64. We may have data hanging
752     //around between calls. We fill up this buffer from the low
753     //end, i.e. [0], then [1], then [2], etc.
754     };
755    
756    
757     //Result structure, used to hold result. Caller is allowed to
758     //pick it apart.
759     struct SHA1_Sha1ResultStruct
760     {
761     unsigned sha1_words[5];
762     //SHA1 value as a set of words. 5 * 32 = 160 bits.
763     char sha1_chars[41];
764     //Zero terminated string containing SHA1 formed, with lower-case
765     //letters.
766     };
767    
768     //Initializes the SHA1 calculation structure.
769     DECMOD_SHA1
770     void SHA1_Sha1StateStructOpen(struct SHA1_Sha1StateStruct *arg);
771    
772     //Adds data to it. Zero length is OK.
773     DECMOD_SHA1
774     void SHA1_Sha1StateStructAddData(struct SHA1_Sha1StateStruct *arg,
775     void *data,
776     size_t len);
777    
778     //Closes the structure and returns the SHA1. This is destructive--one cannot
779     //continue adding characters. All characters returned are lower-case.
780     DECMOD_SHA1
781     void SHA1_Sha1StateStructClose(struct SHA1_Sha1StateStruct *state,
782     struct SHA1_Sha1ResultStruct *result);
783    
784     //Returns version control information.
785     DECMOD_SHA1 const char *SHA1_cvcinfo(void);
786     DECMOD_SHA1 const char *SHA1_hvcinfo(void);
787    
788     //Definition of the version of the H file, used for providing version control
789     //information to external callers.
790     #define SHA1_H_VERSION ("$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/lib_c++_c_asm_non_uc/src_os_unix_win/c___app_common/sha1/sha1.h,v 1.5 2007/01/28 07:07:47 dashley Exp $")
791    
792     #endif
793    
794     //**************************************************************************
795     // $Log: sha1.h,v $
796     // Revision 1.5 2007/01/28 07:07:47 dashley
797     // Minor edits.
798     //
799     // Revision 1.4 2007/01/28 04:57:14 dashley
800     // Edits.
801     //
802     // Revision 1.3 2007/01/28 04:21:40 dashley
803     // Documentation changes.
804     //
805     // Revision 1.2 2007/01/28 01:54:47 dashley
806     // Integration of SHA1 functionality from RFC. Does not pass unit testing,
807     // and will need massaging.
808     //
809     // Revision 1.1 2007/01/27 06:05:51 dashley
810     // Initial checkin.
811     //**************************************************************************
812     // End of $RCSfile: sha1.h,v $.

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