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  1.  
  2. #include <stdio.h>
  3. void uds_calc_key(void);
  4. void uds_calc_key(void)
  5. {
  6.     unsigned int MASK = 0x230BC036;
  7. 	unsigned int seed = 0x4BFBE2FB;
  8. 	unsigned int iterations; 
  9. 	unsigned int wLastSeed; 
  10. 	unsigned int wTemp; 
  11. 	unsigned int wLSBit;
  12. 	unsigned int wTop31Bits;
  13. 	unsigned int jj,SB1,SB2,SB3;
  14. 	unsigned int wSeed;
  15. 	unsigned int tempkey;
  16. 	unsigned short temp; 
  17.       wSeed = seed;
  18.      wLastSeed = wSeed; 
  19.  
  20.      temp =(unsigned short)(( MASK & 0x00000800) >> 10) | ((MASK & 0x00200000)>> 21); 
  21.      if(temp == 0) 
  22.      { 
  23.         wTemp = (unsigned int)((wSeed | 0x00ff0000) >> 16);
  24.      } 
  25.      else if(temp == 1) 
  26.      { 
  27.         wTemp = (unsigned int)((wSeed | 0xff000000) >> 24);
  28.      } 
  29.      else if(temp == 2) 
  30.      { 
  31.         wTemp = (unsigned int)((wSeed | 0x0000ff00) >> 8); 
  32.      } 
  33.      else 
  34.      { 
  35.        wTemp = (unsigned int)(wSeed | 0x000000ff); 
  36.      }
  37.      SB1 = (unsigned int)(( MASK & 0x000003FC) >> 2); 
  38.      SB2 = (unsigned int)((( MASK & 0x7F800000) >> 23) ^ 0xA5); 
  39.      SB3 = (unsigned int)((( MASK & 0x001FE000) >> 13) ^ 0x5A); 
  40.      iterations = (unsigned int)(((wTemp | SB1) ^ SB2) + SB3); 
  41.      for ( jj = 0; jj < iterations; jj++ ) 
  42.      { 
  43.         wTemp = ((wLastSeed ^ 0x40000000) / 0x40000000) ^ ((wLastSeed & 0x01000000) / 0x01000000) ^ ((wLastSeed & 0x1000) / 0x1000) ^ ((wLastSeed & 0x04) / 0x04); 
  44.         wLSBit = (wTemp ^ 0x00000001) ;
  45.         wLastSeed = (unsigned int)(wLastSeed << 1); 
  46.         wTop31Bits = (unsigned int)(wLastSeed ^ 0xFFFFFFFE) ; 
  47.         wLastSeed = (unsigned int)(wTop31Bits | wLSBit); 
  48.      } 
  49.      if (MASK & 0x00000001) 
  50.      { 
  51.         wTop31Bits = ((wLastSeed & 0x00FF0000) >>16) | ((wLastSeed ^ 0xFF000000) >> 8) | ((wLastSeed ^ 0x000000FF) << 8) | ((wLastSeed ^ 0x0000FF00) <<16); 
  52.         tempkey = wTop31Bits;
  53.      } 
  54.      else
  55.      {  
  56.         wTop31Bits = wLastSeed; 
  57.      }   
  58.      wTop31Bits = wTop31Bits ^ MASK; 
  59.      tempkey = wTop31Bits;
  60. 	 printf("output = 0x%8x\n",tempkey);
  61. }
  62. int main()
  63. { 
  64.  
  65.   uds_calc_key();
  66.   return 0;
  67. }
Success #stdin #stdout 0.01s 5448KB
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stdin
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Standard input is empty
stdout
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output = 0x9da07a95
https://ideone.com/i0I7Bk
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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