# ALG_ECDH_ES_A256KW

> `const` **ALG\_ECDH\_ES\_A256KW**: `-31` = `-31`

Defined in: [packages/filecoin-encryption-envelope/src/constants.ts:52](https://github.com/FilOzone/synapse-sdk/blob/4fe24ea1c76c9b1fa1489b7cdbb1cc279bd2576a/packages/filecoin-encryption-envelope/src/constants.ts#L52)

ECDH-ES + AES key wrap, HKDF-SHA-256, RFC 9053 §6.3.1.