container.hpp

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#ifndef CONTAINER_HPP
#define CONTAINER_HPP
 
#include "cipher.hpp"
#include "mac.hpp"
#include "util.hpp"
#include <cstdint>
#include <stdexcept>
#include <string>


enum class Mode : uint8_t {
    ECB = 1,
    CBC = 2,
    CFB = 3,
    OFB = 4,
    CTR = 5
};

constexpr size_t CONTAINER_HEADER_SIZE = 22;
constexpr size_t CONTAINER_MIN_SIZE = CONTAINER_HEADER_SIZE + MAC_TAG_SIZE;

Mode parse_mode(const std::string& str);

std::string mode_name(Mode mode);

class AuthenticationError : public std::runtime_error {
    using std::runtime_error::runtime_error;
};

class FormatError : public std::runtime_error {
    using std::runtime_error::runtime_error;
};

class SecureEnvelope {
public:
    explicit SecureEnvelope(const uint8_t master_key[KEY_SIZE]);

    util::Bytes seal(const util::Bytes& plaintext, Mode mode, const uint8_t* custom_iv = nullptr) const;

    util::Bytes open(const util::Bytes& blob) const;
 
private:
    explicit SecureEnvelope(DerivedKeys keys);
 
    CustomCipher enc_cipher_;
    CustomCipher mac_cipher_;
};
 
#endif // CONTAINER_HPP