sha1.h

// Copyright (c) 2017 IIS (The Internet Foundation in Sweden)
// Based on public domain code.
// Modified by Göran Andersson <goran@init.se>
 
#pragma once
 
#include <iostream>
#include <string>
#include <cstdint>
 
void base64_encode(const unsigned char *src, size_t len, char *destination);
 
class SHA1 {
public:
    // You provide a buffer, at least 27 bytes large.
    SHA1(char *buf);
 
    // Result (base64 encoded) will be stored in buf, no nul termination.
    void update(const char *key);
 
private:
    static bool is_big_endian;
    char *the_res;
 
    static const uint32_t 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];
    uint64_t transforms;
 
    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, int max);
};