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1 /* $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 $
2 //-------------------------------------------------------------------------------------------------
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5 //-------------------------------------------------------------------------------------------------
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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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