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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <stdint.h>
  4. #include <time.h>
  5.  
  6. typedef uint8_t u8;
  7. typedef uint32_t u32;
  8.  
  9. u8            scr_tbl[64] = {
  10.   0x3d, 0xd6, 0xf4, 6, 0xa3, 0xc9, 0x8d, 0xcd, 0x3a, 0xe6, 0x4e, 0x52,
  11.   0xd9, 0xff, 2, 0x61, 0xb9, 0x42, 0x7a, 0x20, 0x37, 0xc8, 0xb4, 0x1e, 0xe,
  12.   0x8f, 3, 0xc, 0xba, 0x67, 0x62, 0x40, 0x45, 0x38, 0xfc, 0x4c, 0x1a, 0xbc,
  13.   0x6d, 0xc7, 0xdb, 0x12, 0x87, 0xdb, 0x21, 0x90, 0xf6, 0x97, 0xdf, 0x90,
  14.   0xd2, 0x4f, 0xf5, 0x9f, 0xfd, 1, 0xd0, 0x54, 0x13, 0x13, 0xe2, 0xc7,
  15.   0xc5, 0x28 
  16. };
  17.  
  18. u32
  19. auth_code( u32 a1 )
  20. {
  21.   u32           v2, v4;
  22.   u8           *v3;
  23.  
  24.   v2 = a1;
  25.   v3 = scr_tbl;
  26.   do
  27.   {
  28.     v2 ^= *( u32 * ) &scr_tbl[4 * ( ( a1 >> ( ( u8 ) v3 - ( u32 ) scr_tbl ) ) & 0xf )];
  29.     v4 = *( u32 * ) v3;
  30.     v3 += 4;
  31.     a1 ^= v4;
  32.   }
  33.   while( v3 != &scr_tbl[32] );
  34.   return v2;
  35. }
  36.  
  37. int
  38. main( int argc, char *argv[] )
  39. {
  40.   u32 challenge;
  41.  
  42.   printf( "Zaquencer V1.5 Authorization Generator\n" );
  43.   printf( "Usage: %s [challenge]\n\n", argv[0] );
  44.   if( argc > 1 )
  45.     challenge = strtoul( argv[1], NULL, 16 );
  46.   else
  47.   {
  48.     srand( time( NULL ) );
  49.     challenge = rand( );
  50.   }
  51.   printf( "%s %08lX -> %s %08lX\n", 
  52.       (argc > 1) ? "Challenge" : "DemoChal", challenge, 
  53.       (argc > 1) ? "Authorization" : "DemoAuth", auth_code( challenge ) );
  54.   return 0;
  55. }
Success #stdin #stdout 0.01s 5292KB
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Zaquencer V1.5 Authorization Generator
Usage: ./prog [challenge]

DemoChal 03DECA1F -> DemoAuth 071EA8FA
https://ideone.com/CL3cxz
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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