keepass::ChaCha20Cipher Class Reference

ChaCha20 stream cipher implementation (RFC 8439, 32-bit counter). More...

#include <cipher.hh>

Public Member Functions
	ChaCha20Cipher (const uint8_t *key, const std::array< uint8_t, 12 > &init_vec)
	Constructs a ChaCha20 cipher with the given key and nonce.
	~ChaCha20Cipher ()
	Zeroizes the cipher state holding the key.
void	Process (const std::array< uint8_t, 64 > &src, std::array< uint8_t, 64 > &dst)
	Encrypts or decrypts a single 64-byte block.

Detailed Description

ChaCha20 stream cipher implementation (RFC 8439, 32-bit counter).

Constructor & Destructor Documentation

ChaCha20Cipher()

keepass::ChaCha20Cipher::ChaCha20Cipher	(	const uint8_t *	key,
		const std::array< uint8_t, 12 > &	init_vec
	)

Constructs a ChaCha20 cipher with the given key and nonce.

Parameters

key	The 256-bit (32-byte) encryption key.
init_vec	The 12-byte nonce (initialization vector).

Member Function Documentation

Process()

void keepass::ChaCha20Cipher::Process	(	const std::array< uint8_t, 64 > &	src,
		std::array< uint8_t, 64 > &	dst
	)

Encrypts or decrypts a single 64-byte block.

Because ChaCha20 is a stream cipher, encryption and decryption are the same XOR operation. The internal counter is advanced after each call.

Parameters

src	The 64-byte input block (plaintext or ciphertext).
dst	The 64-byte output block (ciphertext or plaintext).

---

The documentation for this class was generated from the following file:

• cipher.hh