libs/sha1/sha1.h

   1 /*
   2     sha1.h - header of
   3
   4     ============
   5     SHA-1 in C++
   6     ============
   7
   8     100% Public Domain.
   9
  10     Original C Code
  11         -- Steve Reid <steve@edmweb.com>
  12     Small changes to fit into bglibs
  13         -- Bruce Guenter <bruce@untroubled.org>
  14     Translation to simpler C++ Code
  15         -- Volker Grabsch <vog@notjusthosting.com>
  16     Fixing bugs and improving style
  17         -- Eugene Hopkinson <slowriot at voxelstorm dot com>
  18 */
  19
  20 #ifndef SHA1_HPP
  21 #define SHA1_HPP
  22
  23
  24 #include <iostream>
  25 #include <string>
  26 #include <stdint.h>
  27
  28 class SHA1
  29 {
  30 public:
  31     SHA1();
  32     void update(const std::string &s);
  33     void update(std::istream &is);
  34     std::string final();
  35     static std::string from_file(const std::string &filename);
  36
  37 private:
  38     static constexpr unsigned int DIGEST_INTS = 5;  /* number of 32bit integers per SHA1 digest */
  39     static constexpr unsigned int BLOCK_INTS = 16;  /* number of 32bit integers per SHA1 block */
  40     static constexpr unsigned int BLOCK_BYTES = BLOCK_INTS * 4;
  41
  42     uint32_t digest[DIGEST_INTS];
  43     std::string buffer;
  44     uint64_t transforms;
  45
  46     void reset();
  47     void transform(uint32_t block[BLOCK_BYTES]);
  48
  49     static void read(std::istream &is, std::string &s, size_t max);
  50     static void buffer_to_block(const std::string &buffer, uint32_t block[BLOCK_INTS]);
  51 };
  52
  53 std::string sha1(const std::string &string);
  54
  55
  56
  57 #endif /* SHA1_HPP */