ALG_ECDH_ES_A256KW

const ALG_ECDH_ES_A256KW: -31 = -31

Defined in: packages/filecoin-encryption-envelope/src/cose/constants.ts:88

ECDH-ES + AES key wrap. Deferred — defined here so recipients using it can be recognised and skipped, not unwrapped.

When that profile is written, the reference is RFC 9053 §6.4 (key agreement with key wrap), not §6.3 (direct key agreement).