base64 Namespace Reference

Functions
std::string	serverWebSocketKey (const std::string &clientWebSocketKey)
static bool	is_base64 (char c)
std::string	base64_encode (const unsigned char *bytes_to_encode, std::size_t length)
std::string	base64_decode (const std::string &encoded_string)

Function Documentation

base64_decode()

std::string base64::base64_decode

(

const std::string &

encoded_string

)

Definition at line 115 of file base64.cpp.

                                                             {
        static const std::string base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                                                "abcdefghijklmnopqrstuvwxyz"
                                                "0123456789+/";
        std::string::size_type in_len = encoded_string.size();
        std::string::size_type i = 0;
        std::string::size_type in_ = 0;
        char char_array_4[4];
        char char_array_3[3];
        std::string ret;
 
        while (in_len-- > 0 && (encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
            char_array_4[i++] = encoded_string[in_];
            in_++;
            if (i == 4) {
                for (i = 0; i < 4; i++) {
                    char_array_4[i] = static_cast<char>(base64_chars.find(char_array_4[i]));
                }
 
                char_array_3[0] = static_cast<char>((char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4));
                char_array_3[1] = static_cast<char>(((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2));
                char_array_3[2] = static_cast<char>(((char_array_4[2] & 0x3) << 6) + char_array_4[3]);
 
                for (i = 0; (i < 3); i++) {
                    ret += char_array_3[i];
                }
                i = 0;
            }
        }
 
        if (i != 0) {
            for (std::string::size_type j = i; j < 4; j++) {
                char_array_4[j] = 0;
            }
 
            for (std::string::size_type j = 0; j < 4; j++) {
                char_array_4[j] = static_cast<char>(base64_chars.find(char_array_4[j]));
            }
 
            char_array_3[0] = static_cast<char>((char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4));
            char_array_3[1] = static_cast<char>(((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2));
            char_array_3[2] = static_cast<char>(((char_array_4[2] & 0x3) << 6) + char_array_4[3]);
 
            for (std::string::size_type j = 0; j < i - 1; j++) {
                ret += char_array_3[j];
            }
        }
 
        return ret;
    }

References is_base64().

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base64_encode()

std::string base64::base64_encode	(	const unsigned char *	bytes_to_encode,
		std::size_t	length
	)

Definition at line 69 of file base64.cpp.

                                                                                    {
        static const std::string base64_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                                                "abcdefghijklmnopqrstuvwxyz"
                                                "0123456789+/";
        std::string ret;
        int i = 0;
        unsigned char char_array_3[3];
        unsigned char char_array_4[4];
 
        while (length-- > 0) {
            char_array_3[i++] = *(bytes_to_encode++);
            if (i == 3) {
                char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
                char_array_4[1] = static_cast<unsigned char>(((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4));
                char_array_4[2] = static_cast<unsigned char>(((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6));
                char_array_4[3] = char_array_3[2] & 0x3f;
 
                for (i = 0; i < 4; i++) {
                    ret += base64_chars[char_array_4[i]];
                }
                i = 0;
            }
        }
 
        if (i != 0) {
            for (int j = i; j < 3; j++) {
                char_array_3[j] = '\0';
            }
 
            char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
            char_array_4[1] = static_cast<unsigned char>(((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4));
            char_array_4[2] = static_cast<unsigned char>(((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6));
            char_array_4[3] = char_array_3[2] & 0x3f;
 
            for (int j = 0; j < i + 1; j++) {
                ret += base64_chars[char_array_4[j]];
            }
 
            while (i++ < 3) {
                ret += '=';
            }
        }
 
        return ret;
    }

Referenced by express::middleware::BasicAuthentication::BasicAuthentication(), web::websocket::client::SocketContextUpgradeFactory::prepare(), and serverWebSocketKey().

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is_base64()

static bool base64::is_base64 ( char  c )

static

Definition at line 65 of file base64.cpp.

                                  {
        return ((isalnum(c) != 0) || (c == '+') || (c == '/'));
    }

Referenced by base64_decode().

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serverWebSocketKey()

std::string base64::serverWebSocketKey

(

const std::string &

clientWebSocketKey

)

Definition at line 56 of file base64.cpp.

                                                                      {
        const std::string GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
        const std::string serverWebSocketKey(clientWebSocketKey + GUID);
        std::vector<unsigned char> digest = utils::sha1(serverWebSocketKey);
 
        return base64_encode(digest.data(), digest.size());
    }

References base64_encode().

Referenced by web::websocket::client::SocketContextUpgradeFactory::create(), and web::websocket::server::SocketContextUpgradeFactory::create().

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