/*

* OctetString

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#ifndef BOTAN_SYMKEY_H_

#define BOTAN_SYMKEY_H_

#include <botan/secmem.h>

#include <span>

#include <string>

namespace Botan {

class RandomNumberGenerator;

/**

* Octet String

*/

class BOTAN_PUBLIC_API(2, 0) OctetString final {

   public:

      /**

      * @return size of this octet string in bytes

      */

      size_t length() const { return m_data.size(); }

      size_t size() const { return m_data.size(); }

      bool empty() const { return m_data.empty(); }

      /**

      * @return this object as a secure_vector<uint8_t>

      */

      secure_vector<uint8_t> bits_of() const { return m_data; }

      /**

      * @return start of this string

      */

      const uint8_t* begin() const { return m_data.data(); }

      /**

      * @return end of this string

      */

      const uint8_t* end() const { return begin() + m_data.size(); }

      /**

      * @return this encoded as hex

      */

      std::string to_string() const;

      /**

      * XOR the contents of another octet string into this one

      * @param other octet string

      * @return reference to this

      */

      OctetString& operator^=(const OctetString& other);

      /**

      * Force to have odd parity

      *

      * Deprecated. There is no reason to use this outside of interacting with

      * some very old or weird system which requires DES and also which do not

      * automatically ignore the parity bits.

      */

      BOTAN_DEPRECATED("Why would you need to do this")

      void set_odd_parity();

      /**

      * Create a new OctetString

      * @param str is a hex encoded string

      */

      explicit OctetString(std::string_view str = "");

      /**

      * Create a new random OctetString

      * @param rng is a random number generator

      * @param len is the desired length in bytes

      */

      OctetString(RandomNumberGenerator& rng, size_t len);

      /**

      * Create a new OctetString

      * @param in is an array

      * @param len is the length of in in bytes

      */

      OctetString(const uint8_t in[], size_t len);

      /**

      * Create a new OctetString

      * @param in a bytestring

      */

      explicit OctetString(std::span<const uint8_t> in) : m_data(in.begin(), in.end()) {}

      /**

      * Create a new OctetString

      * @param in a bytestring

      */

      explicit OctetString(secure_vector<uint8_t> in) : m_data(std::move(in)) {}

   private:

      secure_vector<uint8_t> m_data;

};

/**

* Compare two strings

* @param x an octet string

* @param y an octet string

* @return if x is equal to y

*/

BOTAN_PUBLIC_API(2, 0) bool operator==(const OctetString& x, const OctetString& y);

/**

* Compare two strings

* @param x an octet string

* @param y an octet string

* @return if x is not equal to y

*/

BOTAN_PUBLIC_API(2, 0) bool operator!=(const OctetString& x, const OctetString& y);

/**

* Concatenate two strings

* @param x an octet string

* @param y an octet string

* @return x concatenated with y

*/

BOTAN_PUBLIC_API(2, 0) OctetString operator+(const OctetString& x, const OctetString& y);

/**

* XOR two strings

* @param x an octet string

* @param y an octet string

* @return x XORed with y

*/

BOTAN_PUBLIC_API(2, 0) OctetString operator^(const OctetString& x, const OctetString& y);

/**

* Alternate name for octet string showing intent to use as a key

*/

using SymmetricKey = OctetString;

/**

* Alternate name for octet string showing intent to use as an IV

*/

using InitializationVector = OctetString;

}  // namespace Botan

#endif