spqr

var (
	// ErrInvalidCtMac is returned when a ciphertext MAC does not verify.
	// Mirrors Error::InvalidCtMac.
	ErrInvalidCtMac = errors.New("spqr: ciphertext MAC is invalid")
	// ErrInvalidHdrMac is returned when an encapsulation-key header MAC does not
	// verify. Mirrors Error::InvalidHdrMac.
	ErrInvalidHdrMac = errors.New("spqr: encapsulation-key header MAC is invalid")
)

var (
	// ErrKeyJump is returned when a requested key index is more than max_jump
	// ahead of the current counter. Mirrors Error::KeyJump.
	ErrKeyJump = errors.New("spqr: requested key too far ahead (max jump)")
	// ErrKeyTrimmed is returned when a requested out-of-order key is older than
	// the retention window. Mirrors Error::KeyTrimmed.
	ErrKeyTrimmed = errors.New("spqr: requested key already trimmed (too old)")
	// ErrKeyAlreadyRequested is returned when a key index was already consumed.
	// Mirrors Error::KeyAlreadyRequested.
	ErrKeyAlreadyRequested = errors.New("spqr: key already requested")
	// ErrEpochOutOfRange is returned for an epoch not in the retained window.
	// Mirrors Error::EpochOutOfRange.
	ErrEpochOutOfRange = errors.New("spqr: epoch out of range")
	// ErrSendKeyEpochDecreased is returned when send_key is asked for an epoch
	// older than the current send epoch. Mirrors Error::SendKeyEpochDecreased.
	ErrSendKeyEpochDecreased = errors.New("spqr: send key epoch decreased")
	// ErrChainDecode is returned when a Chain proto is structurally invalid.
	// Mirrors Error::StateDecode in the chain context.
	ErrChainDecode = errors.New("spqr: invalid chain state")
)

var (
	// ErrVersionMismatch is returned when a peer presents a lower version than
	// ours and we are not allowed to negotiate. Mirrors Error::VersionMismatch.
	ErrVersionMismatch = errors.New("spqr: version mismatch after negotiation")
	// ErrMinimumVersion is returned when a peer's version is below our configured
	// minimum. Mirrors Error::MinimumVersion.
	ErrMinimumVersion = errors.New("spqr: peer version below minimum")
	// ErrChainNotAvailable is returned when a V1 state needs its Chain but none is
	// present and no version-negotiation block can build one. Mirrors
	// Error::ChainNotAvailable.
	ErrChainNotAvailable = errors.New("spqr: chain not available")
)

var (
	// ErrEpochOutOfRangeV1 is returned when a received message's epoch is ahead
	// of the state's. Mirrors Error::EpochOutOfRange in the v1 dispatch.
	ErrEpochOutOfRangeV1 = errors.New("spqr: v1 message epoch out of range")
	// ErrErroneousData is returned when a received ek does not match the header
	// it should correspond to. Mirrors Error::ErroneousDataReceived.
	ErrErroneousData = errors.New("spqr: erroneous data received")
)

var (
	// ErrInvalidState is returned when a serialized state cannot be decoded as a
	// PqRatchetState protobuf.
	ErrInvalidState = errors.New("spqr: invalid serialized state")
)

var ErrMsgDecode = errors.New("spqr: invalid serialized message")

var ErrV1StateDecode = errors.New("spqr: invalid v1 state")