sha1.hpp

/*
    sha1.hpp - header of
 
    ============
    SHA-1 in C++
    ============
 
    100% Public Domain.
 
    Original C Code
        -- Steve Reid <steve@edmweb.com>
    Small changes to fit into bglibs
        -- Bruce Guenter <bruce@untroubled.org>
    Translation to simpler C++ Code
        -- Volker Grabsch <vog@notjusthosting.com>
    Safety fixes
        -- Eugene Hopkinson <slowriot at voxelstorm dot com>
*/

#ifndef SHA1_HPP
#define SHA1_HPP


#include <iostream>
#include <string>


class SHA1
{
public:
    SHA1();
    void update(const std::string &s);
    void update(std::istream &is);
    std::string final();
    static std::string from_file(const std::string &filename);

private:
    typedef unsigned long int uint32;   /* just needs to be at least 32bit */
    typedef unsigned long long uint64;  /* just needs to be at least 64bit */

    static const uint DIGEST_INTS = 5;  /* number of 32bit integers per SHA1 digest */
    static const uint BLOCK_INTS = 16;  /* number of 32bit integers per SHA1 block */
    static const uint BLOCK_BYTES = BLOCK_INTS * 4;

    uint32 digest[DIGEST_INTS];
    std::string buffer;
    uint64 transforms;

    void reset();
    void transform(uint32 block[BLOCK_BYTES]);

    static void buffer_to_block(const std::string &buffer, uint32 block[BLOCK_INTS]);
    static void read(std::istream &is, std::string &s, size_t max);
};


#endif /* SHA1_HPP */