blob

const (
	// NonceSize is the length of a chacha20poly1305 nonce, 24 bytes.
	NonceSize = chacha20poly1305.NonceSizeX

	// KeySize is the length of a chacha20poly1305 key, 32 bytes.
	KeySize = chacha20poly1305.KeySize

	// CiphertextExpansion is the number of bytes padded to a plaintext
	// encrypted with chacha20poly1305, which comes from a 16-byte MAC.
	CiphertextExpansion = 16

	// V0PlaintextSize is the plaintext size of a version 0 encoded blob.
	//    sweep address length:            1 byte
	//    padded sweep address:           42 bytes
	//    revocation pubkey:              33 bytes
	//    local delay pubkey:             33 bytes
	//    csv delay:                       4 bytes
	//    commit to-local revocation sig: 64 bytes
	//    commit to-remote pubkey:        33 bytes, maybe blank
	//    commit to-remote sig:           64 bytes, maybe blank
	V0PlaintextSize = 274

	// V1PlaintextSize is the plaintext size of a version 1 encoded blob.
	//    sweep address length:            1 byte
	//    padded sweep address:           42 bytes
	//    revocation pubkey:              32 bytes
	//    local delay pubkey:             32 bytes
	//    commit to-local revocation sig: 64 bytes
	//    hash of to-local delay script:  32 bytes
	//    commit to-remote pubkey:        33 bytes, maybe blank
	//    commit to-remote sig:           64 bytes, maybe blank
	V1PlaintextSize = 300

	// MaxSweepAddrSize defines the maximum sweep address size that can be
	// encoded in a blob.
	MaxSweepAddrSize = 42
)

const (
	// TypeAltruistCommit sweeps only commitment outputs to a sweep address
	// controlled by the user, and does not give the tower a reward.
	TypeAltruistCommit = Type(FlagCommitOutputs)

	// TypeAltruistAnchorCommit sweeps only commitment outputs from an
	// anchor commitment to a sweep address controlled by the user, and does
	// not give the tower a reward.
	TypeAltruistAnchorCommit = Type(FlagCommitOutputs | FlagAnchorChannel)

	// TypeRewardCommit sweeps only commitment outputs to a sweep address
	// controlled by the user, and pays a negotiated reward to the tower.
	TypeRewardCommit = Type(FlagCommitOutputs | FlagReward)

	// TypeAltruistTaprootCommit sweeps only the commitment outputs from a
	// taproot channel commitment to a sweep address controlled by the user,
	// and does not give the tower a reward.
	TypeAltruistTaprootCommit = Type(FlagCommitOutputs | FlagTaprootChannel)
)

const BreachHintSize = 16