HEADER_IV

const HEADER_IV: 5 = 5

Defined in: packages/filecoin-encryption-envelope/src/cose/constants.ts:37

iv, RFC 9052 §3.1: a 12-byte nonce (scheme 1) or a 7-byte base nonce (chunked).

COSE permits either bucket. This profile requires the protected one so the IV is covered by the content AAD, and rejects the label in the unprotected map (FIP amendment 3).