/**
 * @file crc32c.ts
 * @description CRC-32C (Castagnoli) checksum for SCTP packets (RFC 4960 App. B,
 * polynomial 0x1EDC6F41), reflected input/output, used with the SCTP-specific
 * byte ordering described in RFC 4960 §6.8 / RFC 3309.
 * @module sctp/crc32c
 */
/**
 * Compute the raw reflected CRC-32C over a buffer.
 * @returns unsigned 32-bit
 */
export declare function crc32c(buf: Buffer): number;
/**
 * Insert the SCTP checksum into a packet. The checksum field (bytes 8..11 of
 * the common header) is zeroed, the CRC computed over the whole packet, then
 * written back in little-endian byte order (RFC 4960 §6.8, RFC 3309).
 * @param packet - full SCTP packet (header + chunks)
 * @returns the same packet, checksum filled in
 */
export declare function applyChecksum(packet: Buffer): Buffer;
/**
 * Validate the checksum of a received SCTP packet.
 */
export declare function verifyChecksum(packet: Buffer): boolean;