sha1.h

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#ifndef UTILS_SHA1_H
#define UTILS_SHA1_H
 
/*
    sha1.h - 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>
    Transform digest to binary
        -- Volker Christian <me@vchrist.at>
*/
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#include <cstddef>
#include <cstdint>
#include <iostream>
#include <string>
#include <vector>
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
namespace utils {
 
    class SHA1 {
    public:
        SHA1();
        void update(const std::string& s);
        void update(std::istream& is);
        std::string final();
 
    private:
        static const unsigned int DIGEST_INTS = 5; /* number of 32bit integers per SHA1 digest */
        static const unsigned int BLOCK_INTS = 16; /* number of 32bit integers per SHA1 block */
        static const unsigned int BLOCK_BYTES = BLOCK_INTS * 4;
 
        uint32_t digest[DIGEST_INTS]{};
        std::string buffer;
        uint64_t transforms = 0;
 
        void reset();
        void transform(uint32_t block[BLOCK_BYTES]);
 
        static void buffer_to_block(const std::string& buffer, uint32_t block[BLOCK_BYTES]);
        static void read(std::istream& is, std::string& s, std::size_t max);
    };
 
    std::vector<unsigned char> sha1(const std::string& string);
 
} // namespace utils
 
#endif // UTILS_SHA1_H