Class Aes_ctr_encryptor

crypto.hpp:68–91

};

class Aes_ctr_encryptor {
public:
	enum {
		NONCE_LEN	= 12,
		KEY_LEN		= AES_KEY_LEN,
		BLOCK_LEN	= 16,
		MAX_CRYPT_BYTES	= (1ULL<<32)*16 // Don't encrypt more than this or the CTR value will repeat itself
	};

private:
	Aes_ecb_encryptor	ecb;
	unsigned char		ctr_value[BLOCK_LEN];	// Current CTR value (used as input to AES to derive pad)
	unsigned char		pad[BLOCK_LEN];		// Current encryption pad (output of AES)
	uint32_t		byte_counter;		// How many bytes processed so far?

public:
	Aes_ctr_encryptor (const unsigned char* key, const unsigned char* nonce);
	~Aes_ctr_encryptor ();

	void process (const unsigned char* in, unsigned char* out, size_t len);

	// Encrypt/decrypt an entire input stream, writing to the given output stream
	static void process_stream (std::istream& in, std::ostream& out, const unsigned char* key, const unsigned char* nonce);
};

typedef Aes_ctr_encryptor Aes_ctr_decryptor;