/**
 * Protocol constants for Sideband Relay Protocol (SBRP).
 */
/** Domain separation context for handshake signature payload */
export declare const SBRP_HANDSHAKE_CONTEXT = "sbrp-v1-handshake";
/** Domain separation context for transcript hash (HKDF salt) */
export declare const SBRP_TRANSCRIPT_CONTEXT = "sbrp-v1-transcript";
/** HKDF info string for session key derivation */
export declare const SBRP_SESSION_KEYS_INFO = "sbrp-session-keys";
/** Length of session keys in bytes (clientToDaemon + daemonToClient) */
export declare const SESSION_KEYS_LENGTH = 64;
/** Length of a single symmetric key in bytes */
export declare const SYMMETRIC_KEY_LENGTH = 32;
/** Length of Ed25519 public key in bytes */
export declare const ED25519_PUBLIC_KEY_LENGTH = 32;
/** Length of Ed25519 private key seed in bytes */
export declare const ED25519_PRIVATE_KEY_LENGTH = 32;
/** Length of Ed25519 signature in bytes */
export declare const ED25519_SIGNATURE_LENGTH = 64;
/** Length of X25519 public key in bytes */
export declare const X25519_PUBLIC_KEY_LENGTH = 32;
/** Length of X25519 private key in bytes */
export declare const X25519_PRIVATE_KEY_LENGTH = 32;
/** Length of ChaCha20-Poly1305 nonce in bytes */
export declare const NONCE_LENGTH = 12;
/** Length of Poly1305 auth tag in bytes */
export declare const AUTH_TAG_LENGTH = 16;
/** Default replay window size (bits). Spec requires ≥64, recommends ≥128. */
export declare const DEFAULT_REPLAY_WINDOW_SIZE = 128n;
/** Direction bytes in nonce (4 bytes, big-endian) */
export declare const DIRECTION_CLIENT_TO_DAEMON: Uint8Array<ArrayBuffer>;
export declare const DIRECTION_DAEMON_TO_CLIENT: Uint8Array<ArrayBuffer>;
/** Frame header size: type (1) + length (4) + sessionId (8) */
export declare const FRAME_HEADER_SIZE = 13;
/** Maximum payload size in bytes (64 KB) */
export declare const MAX_PAYLOAD_SIZE = 65536;
/** HandshakeInit payload: X25519 ephemeral public key */
export declare const HANDSHAKE_INIT_PAYLOAD_SIZE = 32;
/** HandshakeAccept payload: Ed25519 identity key (32) + X25519 ephemeral (32) + Ed25519 signature (64) */
export declare const HANDSHAKE_ACCEPT_PAYLOAD_SIZE = 128;
/** Minimum encrypted payload: nonce (12) + authTag (16), no plaintext */
export declare const MIN_ENCRYPTED_PAYLOAD_SIZE: number;
/** Control payload minimum: code (2 bytes) */
export declare const MIN_CONTROL_PAYLOAD_SIZE = 2;
/** Signal payload size: signal (1) + reason (1) */
export declare const SIGNAL_PAYLOAD_SIZE = 2;
/** Maximum Ping/Pong payload size (0-8 bytes for RTT nonce) */
export declare const MAX_PING_PAYLOAD_SIZE = 8;
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