transmute-industries / hpke.dev

Exploring HPKE for JOSE & COSE.

hpke.dev

Imagine:

{
  "kty": "EC",
  "crv": "P-256",
  "x": "RGuElrDRaOTXHgOEv4ezdSTQaop_Lbb1doFBjcpRFOw",
  "y": "MAa3Kzj9XcF93vMCtUirjwggStYcXXmaCkYLCzZ4st4",
  "alg": "HPKEv1-Base-DHKEM(P256,HKDFSHA256)-HKDFSHA256"
}

Algorithms

See IANA Assignments for HPKE

The following table is used to restrict JSON Web Keys.

jose	cose	mode	kem	kdf	aead
HPKE-B0	1024	base	0x0010	0x0001	0x0001
HPKE-B1	...	base	0x0011	0x0002	0x0002

{
  "kty": "EC",
  "crv": "P-256",
  "alg": "HPKE-B0",
  "x": "RGuElrDRaOTXHgOEv4ezdSTQaop_Lbb1doFBjcpRFOw",
  "y": "MAa3Kzj9XcF93vMCtUirjwggStYcXXmaCkYLCzZ4st4"
}