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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/md5/md5.c,v 1.5 2007/01/27 03:34:17 dashley Exp $
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680     //-------------------------------------------------------------------------------------------------
681     ** --------------------------------------------------------------------------------
682     ** MD5 Message Digest C Calculation Module
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     ** A description of the functionality of this module and the public interface
701     ** definition is contained in the associated .H file.
702     */
703    
704     #define MODULE_MD5
705    
706     #include <assert.h>
707     #include <stddef.h>
708     #include <string.h>
709    
710     #include "../charfunc/charfunc.h"
711     #include "md5.h"
712    
713    
714     //These are macros which are defined for efficiency. These
715     //functions come from RFC 1321.
716     #define MD5_FUNC_F(x,y,z) (((x) & (y)) | ((~x) & (z)))
717     #define MD5_FUNC_G(x,y,z) (((x) & (z)) | ( (y) & (~z)))
718     #define MD5_FUNC_H(x,y,z) ((x) ^ (y) ^ (z))
719     #define MD5_FUNC_I(x,y,z) ((y) ^ ((x) | (~z)))
720    
721     //This is a left rotation macro, again for efficiency. This
722     //macro rotates a 32-bit quantity x left (cyclically) by
723     //n bits.
724     #define MD5_FUNC_ROT_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
725    
726     //These macros do one operation as described in the RFC. These allow
727     //the inlining of code for far more speed.
728     #define MD5_FUNC_FF(a,b,c,d,x,s,ac) { \
729     (a) += MD5_FUNC_F((b),(c),(d)) + (x) + (unsigned)(ac); \
730     (a) = MD5_FUNC_ROT_LEFT((a),(s)); \
731     (a) += (b); \
732     }
733     #define MD5_FUNC_GG(a,b,c,d,x,s,ac) { \
734     (a) += MD5_FUNC_G((b),(c),(d)) + (x) + (unsigned)(ac); \
735     (a) = MD5_FUNC_ROT_LEFT((a),(s)); \
736     (a) += (b); \
737     }
738     #define MD5_FUNC_HH(a,b,c,d,x,s,ac) { \
739     (a) += MD5_FUNC_H((b),(c),(d)) + (x) + (unsigned)(ac); \
740     (a) = MD5_FUNC_ROT_LEFT((a),(s)); \
741     (a) += (b); \
742     }
743     #define MD5_FUNC_II(a,b,c,d,x,s,ac) { \
744     (a) += MD5_FUNC_I((b),(c),(d)) + (x) + (unsigned)(ac); \
745     (a) = MD5_FUNC_ROT_LEFT((a),(s)); \
746     (a) += (b); \
747     }
748    
749    
750     //This is the padding table to append. It is done with
751     //an array for quickness.
752     static unsigned char MD5_pad_table[] =
753     {
754     0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
755     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
756     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
757     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
758     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
759     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
760     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
761     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
762     };
763    
764    
765     void MD5_Md5StateStructOpen(struct MD5_Md5StateStruct *arg)
766     {
767     assert(arg != NULL);
768    
769     memset(arg, 0, sizeof(struct MD5_Md5StateStruct));
770     //Everything to zero, processed bitcount automatically set to zero.
771    
772     arg->A = 0x67452301; //These assignments directly from RFC.
773     arg->B = 0xEFCDAB89;
774     arg->C = 0x98BADCFE;
775     arg->D = 0x10325476;
776     }
777    
778    
779     //Copies the byte buffer to the word buffer within the state block.
780     //This is done in a way which hides big-endian/little-endian concerns.
781    
782     static void MD5_CopyBytesToWords(struct MD5_Md5StateStruct *arg)
783     {
784     int i;
785    
786     assert(arg != NULL);
787    
788     //Copy the buffer contents into the words. We need to be careful
789     //to do this right, because of big-endian/little-endian concerns.
790     for (i=0; i<16; i++)
791     {
792     assert((i * 4 + 3) < 64);
793     arg->X[i] = (((unsigned int)(arg->buf[i*4+3])) << 24)
794     +
795     (((unsigned int)(arg->buf[i*4+2])) << 16)
796     +
797     (((unsigned int)(arg->buf[i*4+1])) << 8)
798     +
799     (((unsigned int)(arg->buf[i*4])) );
800     }
801     }
802    
803    
804     //Does the MD-5 rounds as specified by RFC 1321.
805    
806     static void MD5_DoMd5Rounds(struct MD5_Md5StateStruct *arg)
807     {
808     unsigned AA, BB, CC, DD;
809     //Directly from RFC 1321.
810     unsigned A, B, C, D;
811     //We also want to buffer out the state variables, to eliminate
812     //the risk of repeated pointer dereferences.
813     unsigned X[16];
814     //Buffer to avoid repeated dereferences.
815    
816     assert(arg != NULL);
817    
818     //Copy bytes into words.
819     MD5_CopyBytesToWords(arg);
820    
821     //Copy out the buffer for speed.
822     X[ 0] = arg->X[ 0];
823     X[ 1] = arg->X[ 1];
824     X[ 2] = arg->X[ 2];
825     X[ 3] = arg->X[ 3];
826     X[ 4] = arg->X[ 4];
827     X[ 5] = arg->X[ 5];
828     X[ 6] = arg->X[ 6];
829     X[ 7] = arg->X[ 7];
830     X[ 8] = arg->X[ 8];
831     X[ 9] = arg->X[ 9];
832     X[10] = arg->X[10];
833     X[11] = arg->X[11];
834     X[12] = arg->X[12];
835     X[13] = arg->X[13];
836     X[14] = arg->X[14];
837     X[15] = arg->X[15];
838    
839     //Buffer out the state for speed.
840     A = arg->A;
841     B = arg->B;
842     C = arg->C;
843     D = arg->D;
844    
845     //Make the assignments to temporary variables as described by the RFC.
846     AA = A;
847     BB = B;
848     CC = C;
849     DD = D;
850    
851     //We can now do the MD-5 rounds directly as described in the RFC. The
852     //most effective way to do this is with macros. I tried using a tabulated
853     //approach, but the speed hit was unbelievably bad. This approach is
854     //about the best known.
855     //
856     //Round 1
857     //
858     MD5_FUNC_FF(A,B,C,D,X[ 0], 7,0xd76aa478); /* 1 */
859     MD5_FUNC_FF(D,A,B,C,X[ 1],12,0xe8c7b756); /* 2 */
860     MD5_FUNC_FF(C,D,A,B,X[ 2],17,0x242070db); /* 3 */
861     MD5_FUNC_FF(B,C,D,A,X[ 3],22,0xc1bdceee); /* 4 */
862     MD5_FUNC_FF(A,B,C,D,X[ 4], 7,0xf57c0faf); /* 5 */
863     MD5_FUNC_FF(D,A,B,C,X[ 5],12,0x4787c62a); /* 6 */
864     MD5_FUNC_FF(C,D,A,B,X[ 6],17,0xa8304613); /* 7 */
865     MD5_FUNC_FF(B,C,D,A,X[ 7],22,0xfd469501); /* 8 */
866     MD5_FUNC_FF(A,B,C,D,X[ 8], 7,0x698098d8); /* 9 */
867     MD5_FUNC_FF(D,A,B,C,X[ 9],12,0x8b44f7af); /* 10 */
868     MD5_FUNC_FF(C,D,A,B,X[10],17,0xffff5bb1); /* 11 */
869     MD5_FUNC_FF(B,C,D,A,X[11],22,0x895cd7be); /* 12 */
870     MD5_FUNC_FF(A,B,C,D,X[12], 7,0x6b901122); /* 13 */
871     MD5_FUNC_FF(D,A,B,C,X[13],12,0xfd987193); /* 14 */
872     MD5_FUNC_FF(C,D,A,B,X[14],17,0xa679438e); /* 15 */
873     MD5_FUNC_FF(B,C,D,A,X[15],22,0x49b40821); /* 16 */
874     //
875     //Round 2
876     //
877     MD5_FUNC_GG(A,B,C,D,X[ 1], 5,0xf61e2562); /* 17 */
878     MD5_FUNC_GG(D,A,B,C,X[ 6], 9,0xc040b340); /* 18 */
879     MD5_FUNC_GG(C,D,A,B,X[11],14,0x265e5a51); /* 19 */
880     MD5_FUNC_GG(B,C,D,A,X[ 0],20,0xe9b6c7aa); /* 20 */
881     MD5_FUNC_GG(A,B,C,D,X[ 5], 5,0xd62f105d); /* 21 */
882     MD5_FUNC_GG(D,A,B,C,X[10], 9,0x02441453); /* 22 */
883     MD5_FUNC_GG(C,D,A,B,X[15],14,0xd8a1e681); /* 23 */
884     MD5_FUNC_GG(B,C,D,A,X[ 4],20,0xe7d3fbc8); /* 24 */
885     MD5_FUNC_GG(A,B,C,D,X[ 9], 5,0x21e1cde6); /* 25 */
886     MD5_FUNC_GG(D,A,B,C,X[14], 9,0xc33707d6); /* 26 */
887     MD5_FUNC_GG(C,D,A,B,X[ 3],14,0xf4d50d87); /* 27 */
888     MD5_FUNC_GG(B,C,D,A,X[ 8],20,0x455a14ed); /* 28 */
889     MD5_FUNC_GG(A,B,C,D,X[13], 5,0xa9e3e905); /* 29 */
890     MD5_FUNC_GG(D,A,B,C,X[ 2], 9,0xfcefa3f8); /* 30 */
891     MD5_FUNC_GG(C,D,A,B,X[ 7],14,0x676f02d9); /* 31 */
892     MD5_FUNC_GG(B,C,D,A,X[12],20,0x8d2a4c8a); /* 32 */
893     //
894     //Round 3
895     //
896     MD5_FUNC_HH(A,B,C,D,X[ 5], 4,0xfffa3942); /* 33 */
897     MD5_FUNC_HH(D,A,B,C,X[ 8],11,0x8771f681); /* 34 */
898     MD5_FUNC_HH(C,D,A,B,X[11],16,0x6d9d6122); /* 35 */
899     MD5_FUNC_HH(B,C,D,A,X[14],23,0xfde5380c); /* 36 */
900     MD5_FUNC_HH(A,B,C,D,X[ 1], 4,0xa4beea44); /* 37 */
901     MD5_FUNC_HH(D,A,B,C,X[ 4],11,0x4bdecfa9); /* 38 */
902     MD5_FUNC_HH(C,D,A,B,X[ 7],16,0xf6bb4b60); /* 39 */
903     MD5_FUNC_HH(B,C,D,A,X[10],23,0xbebfbc70); /* 40 */
904     MD5_FUNC_HH(A,B,C,D,X[13], 4,0x289b7ec6); /* 41 */
905     MD5_FUNC_HH(D,A,B,C,X[ 0],11,0xeaa127fa); /* 42 */
906     MD5_FUNC_HH(C,D,A,B,X[ 3],16,0xd4ef3085); /* 43 */
907     MD5_FUNC_HH(B,C,D,A,X[ 6],23,0x04881d05); /* 44 */
908     MD5_FUNC_HH(A,B,C,D,X[ 9], 4,0xd9d4d039); /* 45 */
909     MD5_FUNC_HH(D,A,B,C,X[12],11,0xe6db99e5); /* 46 */
910     MD5_FUNC_HH(C,D,A,B,X[15],16,0x1fa27cf8); /* 47 */
911     MD5_FUNC_HH(B,C,D,A,X[ 2],23,0xc4ac5665); /* 48 */
912     //
913     //Round 4
914     //
915     MD5_FUNC_II(A,B,C,D,X[ 0], 6,0xf4292244); /* 49 */
916     MD5_FUNC_II(D,A,B,C,X[ 7],10,0x432aff97); /* 50 */
917     MD5_FUNC_II(C,D,A,B,X[14],15,0xab9423a7); /* 51 */
918     MD5_FUNC_II(B,C,D,A,X[ 5],21,0xfc93a039); /* 52 */
919     MD5_FUNC_II(A,B,C,D,X[12], 6,0x655b59c3); /* 53 */
920     MD5_FUNC_II(D,A,B,C,X[ 3],10,0x8f0ccc92); /* 54 */
921     MD5_FUNC_II(C,D,A,B,X[10],15,0xffeff47d); /* 55 */
922     MD5_FUNC_II(B,C,D,A,X[ 1],21,0x85845dd1); /* 56 */
923     MD5_FUNC_II(A,B,C,D,X[ 8], 6,0x6fa87e4f); /* 57 */
924     MD5_FUNC_II(D,A,B,C,X[15],10,0xfe2ce6e0); /* 58 */
925     MD5_FUNC_II(C,D,A,B,X[ 6],15,0xa3014314); /* 59 */
926     MD5_FUNC_II(B,C,D,A,X[13],21,0x4e0811a1); /* 60 */
927     MD5_FUNC_II(A,B,C,D,X[ 4], 6,0xf7537e82); /* 61 */
928     MD5_FUNC_II(D,A,B,C,X[11],10,0xbd3af235); /* 62 */
929     MD5_FUNC_II(C,D,A,B,X[ 2],15,0x2ad7d2bb); /* 63 */
930     MD5_FUNC_II(B,C,D,A,X[ 9],21,0xeb86d391); /* 64 */
931     //End of Round 4.
932    
933     //Perform the four additions as mandated by the RFC.
934     A += AA;
935     B += BB;
936     C += CC;
937     D += DD;
938    
939     //Buffer the state vector back.
940     arg->A = A;
941     arg->B = B;
942     arg->C = C;
943     arg->D = D;
944     }
945    
946    
947     void MD5_Md5StateStructAddData(struct MD5_Md5StateStruct *arg,
948     void *pointer_in,
949     size_t len)
950     {
951     unsigned int low_32;
952     unsigned int byte_offset;
953     unsigned char *data;
954    
955     assert(arg != NULL);
956     assert(pointer_in != NULL);
957    
958     data = (unsigned char *)pointer_in;
959     //It is easier to do it this way, rather than cast all the time.
960    
961     low_32 = (unsigned int)arg->bit_count;
962     //Copy off the least significant bits. Easier to do once.
963    
964     byte_offset = low_32 >> 3;
965     //This gives our byte offset, up to 500+Mb or so.
966     //This wraps modulo 64 (i.e. even if the data item overflows, we should be OK.
967    
968     while(len--)
969     {
970     //We process rounds AFTER a byte is added to the buffer. So
971     //it is always safe to add a byte first.
972     arg->buf[byte_offset & 0x3F] = *data;
973    
974     //Nothing to do unless this was the final byte of the buffer.
975     if ((byte_offset & 0x3F) == 63)
976     {
977     MD5_DoMd5Rounds(arg);
978     }
979    
980     //Increment.
981     data++;
982     byte_offset++;
983     arg->bit_count += 8;
984     }
985     }
986    
987    
988     void MD5_Md5StateStructClose(struct MD5_Md5StateStruct *state,
989     struct MD5_Md5ResultStruct *result)
990     {
991     unsigned int low_32, high_32, high_32_copy, low_32_copy;
992     unsigned int byte_offset;
993     unsigned int buffer_offset;
994     unsigned char length_buf[8];
995     //int i;
996    
997     assert(state != NULL);
998     assert(result != NULL);
999    
1000     //Obtain easier-to-use indices. These provide a snapshot of the
1001     //length before padding is done.
1002     low_32 = (unsigned int)state->bit_count;
1003     high_32 = (unsigned int)(state->bit_count >> 32);
1004     byte_offset = low_32 >> 3;
1005     buffer_offset = byte_offset & 0x3F;
1006    
1007     //We need to pad the buffer out to 8 bytes short of a multiple,
1008     //per RFC 1321.
1009     MD5_Md5StateStructAddData(state,
1010     MD5_pad_table,
1011     (buffer_offset==56) ? (64) : ((56 - buffer_offset) & 0x3F));
1012    
1013     //At this point we are fully prepped to stuff in the length in bits.
1014     //Prepare the length in a buffer.
1015     high_32_copy = high_32;
1016     low_32_copy = low_32;
1017     length_buf[0] = (unsigned char)(low_32_copy);
1018     length_buf[1] = (unsigned char)(low_32_copy >> 8);
1019     length_buf[2] = (unsigned char)(low_32_copy >> 16);
1020     length_buf[3] = (unsigned char)(low_32_copy >> 24);
1021     length_buf[4] = (unsigned char)(high_32_copy);
1022     length_buf[5] = (unsigned char)(high_32_copy >> 8);
1023     length_buf[6] = (unsigned char)(high_32_copy >> 16);
1024     length_buf[7] = (unsigned char)(high_32_copy >> 24);
1025    
1026     //Tack on the length. This is guaranteed to generate end up with
1027     //the last thing being done the compute plus the index being zero.
1028     //
1029     MD5_Md5StateStructAddData(state,
1030     length_buf,
1031     8);
1032    
1033     //Be absolutely sure we are rolled over to zero.
1034     assert((((int)state->bit_count) & 0x1FF) == 0);
1035    
1036     //Zero out the return state, just to be sure.
1037     memset(result, 0, sizeof(struct MD5_Md5ResultStruct));
1038    
1039     //Give caller the binary version.
1040     result->md5_words[0] = state->A;
1041     result->md5_words[1] = state->B;
1042     result->md5_words[2] = state->C;
1043     result->md5_words[3] = state->D;
1044    
1045     //Convert to string for caller.
1046     CHARFUNC_int_to_lc_hex_rev(state->A, result->md5_chars + 0);
1047     CHARFUNC_int_to_lc_hex_rev(state->B, result->md5_chars + 8);
1048     CHARFUNC_int_to_lc_hex_rev(state->C, result->md5_chars + 16);
1049     CHARFUNC_int_to_lc_hex_rev(state->D, result->md5_chars + 24);
1050    
1051     //Because of the way the CHARFUNC_int_to_lc_hex_rev() function
1052     //works, it produces the mirror image of the sequence of nibbles.
1053     //This is not quite what we want. What we want (least significant
1054     //byte first, but within each byte most significant nibble first)
1055     //from each integer is this:
1056     //
1057     // n1 n0 n3 n2 n5 n4 n7 n6
1058     //
1059     //but what we get from that function is this:
1060     //
1061     // n0 n1 n2 n3 n4 n5 n6 n6,
1062     //
1063     //so we have to swap nibbles in each byte.
1064     //
1065     {
1066     int i;
1067     char temp;
1068    
1069     for (i=0; i<16; i++)
1070     {
1071     temp = result->md5_chars[i*2];
1072     result->md5_chars[i*2] = result->md5_chars[i*2+1];
1073     result->md5_chars[i*2+1] = temp;
1074     }
1075     }
1076    
1077     result->md5_chars[32] = 0; //Terminator.
1078    
1079     //Destroy the state, which may contain sensitive information.
1080     //This idea came from Rivest's sample code.
1081     memset(state, 0, sizeof(struct MD5_Md5StateStruct));
1082     }
1083    
1084    
1085     //Returns version control string for file.
1086     //
1087     const char *MD5_cvcinfo(void)
1088     {
1089     return ("$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/lib_c++_c_asm_non_uc/src_os_unix_win/c___app_common/md5/md5.c,v 1.5 2007/01/27 03:34:17 dashley Exp $");
1090     }
1091    
1092    
1093     //Returns version control string for associated .H file.
1094     //
1095     const char *MD5_hvcinfo(void)
1096     {
1097     return (MD5_H_VERSION);
1098     }
1099    
1100    
1101     //*****************************************************************************
1102     // $Log: md5.c,v $
1103     // Revision 1.5 2007/01/27 03:34:17 dashley
1104     // a)Block data operation changed to take length argument of type size_t.
1105     // b)Unit-testing has been completed.
1106     //
1107     // Revision 1.4 2007/01/27 03:16:44 dashley
1108     // Edits.
1109     //
1110     // Revision 1.3 2007/01/27 01:40:51 dashley
1111     // GPL license statements added and enhanced.
1112     //
1113     // Revision 1.2 2007/01/13 06:16:27 dashley
1114     // Edits for compilation under Linux.
1115     //
1116     // Revision 1.1 2007/01/13 04:45:42 dashley
1117     // Initial checkin.
1118     //*****************************************************************************
1119     // End of $RCSfile: md5.c,v $.

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