The BIP324 packet cipher, encapsulating its key derivation, stream cipher, and AEAD. More...

#include <bip324.h>

Collaboration diagram for BIP324Cipher:

Public Member Functions
	BIP324Cipher ()=delete
	No default constructor; keys must be provided to create a BIP324Cipher. More...

	BIP324Cipher (const CKey &key, std::span< const std::byte > ent32) noexcept
	Initialize a BIP324 cipher with specified key and encoding entropy (testing only). More...

	BIP324Cipher (const CKey &key, const EllSwiftPubKey &pubkey) noexcept
	Initialize a BIP324 cipher with specified key (testing only). More...

const EllSwiftPubKey &	GetOurPubKey () const noexcept
	Retrieve our public key. More...

void	Initialize (const EllSwiftPubKey &their_pubkey, bool initiator, bool self_decrypt=false) noexcept
	Initialize when the other side's public key is received. More...

	operator bool () const noexcept
	Determine whether this cipher is fully initialized. More...

void	Encrypt (std::span< const std::byte > contents, std::span< const std::byte > aad, bool ignore, std::span< std::byte > output) noexcept
	Encrypt a packet. More...

unsigned	DecryptLength (std::span< const std::byte > input) noexcept
	Decrypt the length of a packet. More...

bool	Decrypt (std::span< const std::byte > input, std::span< const std::byte > aad, bool &ignore, std::span< std::byte > contents) noexcept
	Decrypt a packet. More...

std::span< const std::byte >	GetSessionID () const noexcept
	Get the Session ID. More...

std::span< const std::byte >	GetSendGarbageTerminator () const noexcept
	Get the Garbage Terminator to send. More...

std::span< const std::byte >	GetReceiveGarbageTerminator () const noexcept
	Get the expected Garbage Terminator to receive. More...

Static Public Attributes
static constexpr unsigned	SESSION_ID_LEN {32}

static constexpr unsigned	GARBAGE_TERMINATOR_LEN {16}

static constexpr unsigned	REKEY_INTERVAL {224}

static constexpr unsigned	LENGTH_LEN {3}

static constexpr unsigned	HEADER_LEN {1}

static constexpr unsigned	EXPANSION = LENGTH_LEN + HEADER_LEN + FSChaCha20Poly1305::EXPANSION

static constexpr std::byte	IGNORE_BIT {0x80}

Private Attributes
std::optional< FSChaCha20 >	m_send_l_cipher

std::optional< FSChaCha20 >	m_recv_l_cipher

std::optional< FSChaCha20Poly1305 >	m_send_p_cipher

std::optional< FSChaCha20Poly1305 >	m_recv_p_cipher

CKey	m_key

EllSwiftPubKey	m_our_pubkey

std::array< std::byte, SESSION_ID_LEN >	m_session_id

std::array< std::byte, GARBAGE_TERMINATOR_LEN >	m_send_garbage_terminator

std::array< std::byte, GARBAGE_TERMINATOR_LEN >	m_recv_garbage_terminator

Detailed Description

The BIP324 packet cipher, encapsulating its key derivation, stream cipher, and AEAD.

Definition at line 19 of file bip324.h.

Constructor & Destructor Documentation

◆ BIP324Cipher() [1/3]

BIP324Cipher::BIP324Cipher ( )

delete

No default constructor; keys must be provided to create a BIP324Cipher.

◆ BIP324Cipher() [2/3]

BIP324Cipher::BIP324Cipher	(	const CKey &	key,
		std::span< const std::byte >	ent32
	)

noexcept

Initialize a BIP324 cipher with specified key and encoding entropy (testing only).

Definition at line 25 of file bip324.cpp.

◆ BIP324Cipher() [3/3]

BIP324Cipher::BIP324Cipher	(	const CKey &	key,
		const EllSwiftPubKey &	pubkey
	)

noexcept

Initialize a BIP324 cipher with specified key (testing only).

Definition at line 31 of file bip324.cpp.

Member Function Documentation

◆ Decrypt()

bool BIP324Cipher::Decrypt	(	std::span< const std::byte >	input,
		std::span< const std::byte >	aad,
		bool &	ignore,
		std::span< std::byte >	contents
	)

noexcept

Decrypt a packet.

Only after Initialize().

It must hold that input.size() + LENGTH_LEN == contents.size() + EXPANSION. Contents.size() must equal the length returned by DecryptLength.

Definition at line 100 of file bip324.cpp.

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◆ DecryptLength()

uint32_t BIP324Cipher::DecryptLength ( std::span< const std::byte > input )

noexcept

Decrypt the length of a packet.

Only after Initialize().

It must hold that input.size() == LENGTH_LEN.

Definition at line 89 of file bip324.cpp.

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◆ Encrypt()

void BIP324Cipher::Encrypt	(	std::span< const std::byte >	contents,
		std::span< const std::byte >	aad,
		bool	ignore,
		std::span< std::byte >	output
	)

noexcept

Encrypt a packet.

Only after Initialize().

It must hold that output.size() == contents.size() + EXPANSION.

Definition at line 73 of file bip324.cpp.

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◆ GetOurPubKey()

const EllSwiftPubKey & BIP324Cipher::GetOurPubKey ( ) const

inlinenoexcept

Retrieve our public key.

Definition at line 54 of file bip324.h.

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◆ GetReceiveGarbageTerminator()

std::span< const std::byte > BIP324Cipher::GetReceiveGarbageTerminator ( ) const

inlinenoexcept

Get the expected Garbage Terminator to receive.

Only after Initialize().

Definition at line 93 of file bip324.h.

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◆ GetSendGarbageTerminator()

std::span< const std::byte > BIP324Cipher::GetSendGarbageTerminator ( ) const

inlinenoexcept

Get the Garbage Terminator to send.

Only after Initialize().

Definition at line 90 of file bip324.h.

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◆ GetSessionID()

std::span< const std::byte > BIP324Cipher::GetSessionID ( ) const

inlinenoexcept

Get the Session ID.

Only after Initialize().

Definition at line 87 of file bip324.h.

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◆ Initialize()

void BIP324Cipher::Initialize	(	const EllSwiftPubKey &	their_pubkey,
		bool	initiator,
		bool	self_decrypt = `false`
	)

noexcept

Initialize when the other side's public key is received.

Can only be called once.

initiator is set to true if we are the initiator establishing the v2 P2P connection. self_decrypt is only for testing, and swaps encryption/decryption keys, so that encryption and decryption can be tested without knowing the other side's private key.

Definition at line 34 of file bip324.cpp.

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◆ operator bool()

BIP324Cipher::operator bool ( ) const

inlineexplicitnoexcept

Determine whether this cipher is fully initialized.

Definition at line 65 of file bip324.h.

Member Data Documentation

◆ EXPANSION

constexpr unsigned BIP324Cipher::EXPANSION = LENGTH_LEN + HEADER_LEN + FSChaCha20Poly1305::EXPANSION

staticconstexpr

Definition at line 27 of file bip324.h.

◆ GARBAGE_TERMINATOR_LEN

constexpr unsigned BIP324Cipher::GARBAGE_TERMINATOR_LEN {16}

staticconstexpr

Definition at line 23 of file bip324.h.

◆ HEADER_LEN

constexpr unsigned BIP324Cipher::HEADER_LEN {1}

staticconstexpr

Definition at line 26 of file bip324.h.

◆ IGNORE_BIT

constexpr std::byte BIP324Cipher::IGNORE_BIT {0x80}

staticconstexpr

Definition at line 28 of file bip324.h.

◆ LENGTH_LEN

constexpr unsigned BIP324Cipher::LENGTH_LEN {3}

staticconstexpr

Definition at line 25 of file bip324.h.

◆ m_key

CKey BIP324Cipher::m_key

private

Definition at line 36 of file bip324.h.

◆ m_our_pubkey

EllSwiftPubKey BIP324Cipher::m_our_pubkey

private

Definition at line 37 of file bip324.h.

◆ m_recv_garbage_terminator

std::array<std::byte, GARBAGE_TERMINATOR_LEN> BIP324Cipher::m_recv_garbage_terminator

private

Definition at line 41 of file bip324.h.

◆ m_recv_l_cipher

std::optional<FSChaCha20> BIP324Cipher::m_recv_l_cipher

private

Definition at line 32 of file bip324.h.

◆ m_recv_p_cipher

std::optional<FSChaCha20Poly1305> BIP324Cipher::m_recv_p_cipher

private

Definition at line 34 of file bip324.h.

◆ m_send_garbage_terminator

std::array<std::byte, GARBAGE_TERMINATOR_LEN> BIP324Cipher::m_send_garbage_terminator

private

Definition at line 40 of file bip324.h.

◆ m_send_l_cipher

std::optional<FSChaCha20> BIP324Cipher::m_send_l_cipher

private

Definition at line 31 of file bip324.h.

◆ m_send_p_cipher

std::optional<FSChaCha20Poly1305> BIP324Cipher::m_send_p_cipher

private

Definition at line 33 of file bip324.h.

◆ m_session_id

std::array<std::byte, SESSION_ID_LEN> BIP324Cipher::m_session_id

private

Definition at line 39 of file bip324.h.

◆ REKEY_INTERVAL

constexpr unsigned BIP324Cipher::REKEY_INTERVAL {224}

staticconstexpr

Definition at line 24 of file bip324.h.

◆ SESSION_ID_LEN

constexpr unsigned BIP324Cipher::SESSION_ID_LEN {32}

staticconstexpr

Definition at line 22 of file bip324.h.

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

src/bip324.h
src/bip324.cpp

Public Member Functions

Static Public Attributes

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ BIP324Cipher() [1/3]

◆ BIP324Cipher() [2/3]

◆ BIP324Cipher() [3/3]

Member Function Documentation

◆ Decrypt()

◆ DecryptLength()

◆ Encrypt()

◆ GetOurPubKey()

◆ GetReceiveGarbageTerminator()

◆ GetSendGarbageTerminator()

◆ GetSessionID()

◆ Initialize()

◆ operator bool()

Member Data Documentation

◆ EXPANSION

◆ GARBAGE_TERMINATOR_LEN

◆ HEADER_LEN

◆ IGNORE_BIT

◆ LENGTH_LEN

◆ m_key

◆ m_our_pubkey

◆ m_recv_garbage_terminator

◆ m_recv_l_cipher

◆ m_recv_p_cipher

◆ m_send_garbage_terminator

◆ m_send_l_cipher

◆ m_send_p_cipher

◆ m_session_id

◆ REKEY_INTERVAL

◆ SESSION_ID_LEN