cipher.h

Go to the documentation of this file.

 
#ifndef CPPSECURITY_CIPHER_H
#define CPPSECURITY_CIPHER_H
 
#include "password.h"
 
#include <memory>
 
#include <openssl/evp.h>
 
namespace CppSecurity {
 
enum class CipherAlgorithm
{
    AES128,
    AES192,
    AES256,
    ARIA128,
    ARIA192,
    ARIA256,
    Camellia128,
    Camellia192,
    Camellia256
};
 
 
class Cipher
{
public:
 
    Cipher(CipherAlgorithm algorithm = CipherAlgorithm::AES256, size_t iterations = 1000);
 
    Cipher(std::string_view secret, CipherAlgorithm algorithm = CipherAlgorithm::AES256, size_t iterations = 1000) : Cipher(algorithm, iterations) { Initialize(secret); }
 
    Cipher(std::string_view secret, std::string_view salt, CipherAlgorithm algorithm = CipherAlgorithm::AES256, size_t iterations = 1000) : Cipher(algorithm, iterations) { Initialize(secret, salt); }
    Cipher(const Cipher&) = delete;
    Cipher(Cipher&&) = default;
    ~Cipher() = default;
 
    Cipher& operator=(const Cipher&) = delete;
    Cipher& operator=(Cipher&&) = default;
 
    CipherAlgorithm algorithm() const noexcept { return _algorithm; }
    const std::string& name() const noexcept { return _name; }
    size_t iterations() const noexcept { return _iterations; }
 
 
    static std::string GenerateSalt();
 
 
    void Initialize(std::string_view secret);
 
    void Initialize(std::string_view secret, std::string_view salt);
 
 
    std::string Encrypt(std::string_view str);
 
 
    std::string Decrypt(std::string_view str);
 
private:
    CipherAlgorithm _algorithm;
    std::string _name{"<unknown>"};
    const EVP_CIPHER* _cipher{nullptr};
    size_t _iterations;
    uint8_t _key[EVP_MAX_KEY_LENGTH];
    uint8_t _iv[EVP_MAX_IV_LENGTH];
    std::unique_ptr<EVP_CIPHER_CTX, void (*)(EVP_CIPHER_CTX *)> _encrypt;
    std::unique_ptr<EVP_CIPHER_CTX, void (*)(EVP_CIPHER_CTX *)> _decrypt;
 
    void InitializeContext();
};
 
} // namespace CppSecurity
 
#endif // CPPSECURITY_CIPHER_H