#include <chacha_poly_aead.h>

Collaboration diagram for ChaCha20Poly1305AEAD:

Public Member Functions
	ChaCha20Poly1305AEAD (const unsigned char K_1, size_t K_1_len, const unsigned char K_2, size_t K_2_len)

	ChaCha20Poly1305AEAD (const ChaCha20Poly1305AEAD &)=delete

bool	Crypt (uint64_t seqnr_payload, uint64_t seqnr_aad, int aad_pos, unsigned char dest, size_t dest_len, const unsigned char src, size_t src_len, bool is_encrypt)
	Encrypts/decrypts a packet seqnr_payload, the message sequence number seqnr_aad, the messages AAD sequence number which allows reuse of the AAD keystream aad_pos, position to use in the AAD keystream to encrypt the AAD dest, output buffer, must be of a size equal or larger then CHACHA20_POLY1305_AEAD_AAD_LEN + payload (+ POLY1305_TAG_LEN in encryption) bytes destlen, length of the destination buffer src, the AAD+payload to encrypt or the AAD+payload+MAC to decrypt src_len, the length of the source buffer is_encrypt, set to true if we encrypt (creates and appends the MAC instead of verifying it) More...

bool	GetLength (uint32_t len24_out, uint64_t seqnr_aad, int aad_pos, const uint8_t ciphertext)
	decrypts the 3 bytes AAD data and decodes it into a uint32_t field More...

Private Attributes
ChaCha20	m_chacha_main

ChaCha20	m_chacha_header

unsigned char	m_aad_keystream_buffer [CHACHA20_ROUND_OUTPUT]

uint64_t	m_cached_aad_seqnr

Detailed Description

Definition at line 117 of file chacha_poly_aead.h.

Constructor & Destructor Documentation

◆ ChaCha20Poly1305AEAD() [1/2]

ChaCha20Poly1305AEAD::ChaCha20Poly1305AEAD	(	const unsigned char *	K_1,
		size_t	K_1_len,
		const unsigned char *	K_2,
		size_t	K_2_len
	)

Definition at line 31 of file chacha_poly_aead.cpp.

References CHACHA20_POLY1305_AEAD_KEY_LEN, m_cached_aad_seqnr, m_chacha_header, m_chacha_main, and ChaCha20::SetKey().

◆ ChaCha20Poly1305AEAD() [2/2]

ChaCha20Poly1305AEAD::ChaCha20Poly1305AEAD ( const ChaCha20Poly1305AEAD & )

explicitdelete

Member Function Documentation

◆ Crypt()

bool ChaCha20Poly1305AEAD::Crypt	(	uint64_t	seqnr_payload,
		uint64_t	seqnr_aad,
		int	aad_pos,
		unsigned char *	dest,
		size_t	dest_len,
		const unsigned char *	src,
		size_t	src_len,
		bool	is_encrypt
	)

Encrypts/decrypts a packet seqnr_payload, the message sequence number seqnr_aad, the messages AAD sequence number which allows reuse of the AAD keystream aad_pos, position to use in the AAD keystream to encrypt the AAD dest, output buffer, must be of a size equal or larger then CHACHA20_POLY1305_AEAD_AAD_LEN + payload (+ POLY1305_TAG_LEN in encryption) bytes destlen, length of the destination buffer src, the AAD+payload to encrypt or the AAD+payload+MAC to decrypt src_len, the length of the source buffer is_encrypt, set to true if we encrypt (creates and appends the MAC instead of verifying it)

Definition at line 43 of file chacha_poly_aead.cpp.

References CHACHA20_POLY1305_AEAD_AAD_LEN, CHACHA20_ROUND_OUTPUT, ChaCha20::Crypt(), ChaCha20::Keystream(), m_aad_keystream_buffer, m_cached_aad_seqnr, m_chacha_header, m_chacha_main, memory_cleanse(), poly1305_auth(), POLY1305_KEYLEN, POLY1305_TAGLEN, ChaCha20::Seek(), ChaCha20::SetIV(), and timingsafe_bcmp().