ChaCha20Poly1305AEAD Class Reference

#include <chacha_poly_aead.h>

Collaboration diagram for ChaCha20Poly1305AEAD:

Public Member Functions
	ChaCha20Poly1305AEAD (const uint8_t *K_1, size_t K_1_len, const uint8_t *K_2, size_t K_2_len)
	ChaCha20Poly1305AEAD (const ChaCha20Poly1305AEAD &)=delete
bool	Crypt (uint64_t seqnr_payload, uint64_t seqnr_aad, int aad_pos, uint8_t *dest, size_t dest_len, const uint8_t *src, size_t src_len, bool is_encrypt)
	Encrypts/decrypts a packet.
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

Private Attributes
ChaCha20	m_chacha_main
ChaCha20	m_chacha_header
uint8_t	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 uint8_t *	K_1,
		size_t	K_1_len,
		const uint8_t *	K_2,
		size_t	K_2_len
	)

Definition at line 30 of file chacha_poly_aead.cpp.

Here is the call graph for this function:

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,
		uint8_t *	dest,
		size_t	dest_len,
		const uint8_t *	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 than 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.

Here is the call graph for this function:

Here is the caller graph for this function:

GetLength()

bool ChaCha20Poly1305AEAD::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

Definition at line 121 of file chacha_poly_aead.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

Member Data Documentation

m_aad_keystream_buffer

uint8_t ChaCha20Poly1305AEAD::m_aad_keystream_buffer[CHACHA20_ROUND_OUTPUT]

private

Definition at line 124 of file chacha_poly_aead.h.

m_cached_aad_seqnr

uint64_t ChaCha20Poly1305AEAD::m_cached_aad_seqnr

private

Definition at line 126 of file chacha_poly_aead.h.

m_chacha_header

ChaCha20 ChaCha20Poly1305AEAD::m_chacha_header

private

Definition at line 122 of file chacha_poly_aead.h.

m_chacha_main

ChaCha20 ChaCha20Poly1305AEAD::m_chacha_main

private

Definition at line 120 of file chacha_poly_aead.h.

---

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

• src/crypto/chacha_poly_aead.h
• src/crypto/chacha_poly_aead.cpp