fork download
copy 
  1. #include <string>
  2. #include <algorithm>
  3. #include <iostream>
  4. #include <iomanip>
  5. #include <sstream>
  6. #include <stdio.h>
  7.  
  8. static const size_t DIGEST_SIZE = 32;
  9.  
  10. template< typename T >
  11. std::string int_to_hex( T i )
  12. {
  13.     char buffer [3];
  14.     buffer[2] = 0;
  15.     sprintf(buffer, "%02x", i);
  16.     return std::string(buffer);
  17. }
  18.  
  19. std::string antiDigest(const std::string& a)
  20. {
  21.     if(a.empty())
  22.     {
  23.         throw "cannot digest empty string";
  24.     }
  25.     char r[DIGEST_SIZE ] = {0};
  26.     int block_size = std::min(DIGEST_SIZE, a.length());
  27.     int block_count = 1 + DIGEST_SIZE / a.length();
  28.     for(int i=0; i<block_size; i++)
  29.     {
  30.         int hlp = 0;
  31.         int bc = 0;
  32.  
  33.         while(bc < block_count)
  34.         {
  35.             int idx = i + bc * block_size;
  36.             if(idx >= a.length()) break;
  37.             hlp += a[idx];
  38.             bc ++;
  39.         }
  40.         hlp = (int)(hlp << 3) + hlp;
  41.         unsigned int hlp2 = 0;
  42.         while(hlp)
  43.         {
  44.             int t = hlp - ((hlp/10) * 10);
  45.             hlp2 += t;
  46.             hlp /= 10;
  47.         }
  48.         bc = 0;
  49.         while(bc < block_count)
  50.         {
  51.             int idx = i + bc * block_size;
  52.             if(idx >= DIGEST_SIZE) break;
  53.             r[idx] = ( (hlp2 / 10) + (hlp2-(hlp2/10)*10)) ;    
  54.             bc++;
  55.         }
  56.  
  57.     }
  58.  
  59.     std::stringstream result; 
  60.     for(int i=0; i<DIGEST_SIZE; i++)
  61.     {
  62.         result << int_to_hex(r[i]) ;
  63.     }
  64.     return result.str();
  65. }
  66.  
  67. int main()
  68. {
  69.     std::string a = "the little brown fox jump over the lazy gardener", b = "the whale swims in the shallow waters of prince caspian sea", c = "blue";
  70.     std::string adigest = antiDigest(a);
  71.     std::string bdigest = antiDigest(b);
  72.     std::string cdigest = antiDigest(c);
  73.     std::cout << "adigest=" << adigest << " bdigest=" << bdigest << " cdigest=" << cdigest << std::endl;
  74. }
  75.  
Success #stdin #stdout 0s 3432KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
adigest=0909090909090909090909090909090909090909090909090909090909090909 bdigest=0909090909090909090909090909090909090909090909090909090909090909 cdigest=0909090909090909090909090909090909090909090909090909090909090909
https://ideone.com/t4dibL
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!