# HEADER_CHUNK_SIZE

> `const` **HEADER\_CHUNK\_SIZE**: `-1` = `-1`

Defined in: [packages/filecoin-encryption-envelope/src/cose/constants.ts:60](https://github.com/FilOzone/synapse-sdk/blob/9ad84d812e1dd635b76420a7d9388555a04f31b6/packages/filecoin-encryption-envelope/src/cose/constants.ts#L60)

`chunk_size`, algorithm-specific label per RFC 9052 §3.1. Required for the
chunked scheme, must not appear when `alg` is ALG\_AES\_256\_GCM (3) —
whole-object AEAD has no chunk layout.