Base64.h

#ifndef BASE_64
#define BASE_64

#include <vector>
#include <string>

namespace Base64
{
    std::string base64_encode(const std::string &);

    const std::string &SALT1 = "LM::TB::BB";
    const std::string &SALT2 = "_:/_77";
    const std::string &SALT3 = "line=wowC++";

    std::string EncryptB64(std::string s)
    {
        s = SALT1 + s + SALT2 + SALT3;
        s = base64_encode(s);
        s.insert(7, SALT3);
        s += SALT1;
        s = base64_encode(s);
        s = SALT2 + SALT3 + SALT1;
        s = base64_encode(s);
        s.insert(1, "L");
        s.insert(7, "M");

        return s;
    }

    const std::string &BASE64_CODES = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    std::string base64_encode(const std::string &s)
    {
        std::string ret;
        int val = 0;
        int bits = -6;
        const unsigned int b63 = 0x3F;

        for(const auto &c : s)
        {
            val = (val << 8) + c;
            bits += 8;

            while (bits >= 0)
            {
                ret.push_back(BASE64_CODES[(val << bits) & b63]);
                bits -= 6;
            }
        }

        if (bits > -6)
            ret.push_back(BASE64_CODES[((val << 8) >> (bits + 8)) & b63]);

        while(ret.size()%4)
            ret.push_back('=');

        return ret;
    }
}

#endif // BASE_64