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/**
* Fundamental values that are needed to discern the more specific COSE public key types below.
*
* The use of `Maps` here is due to CBOR encoding being used with public keys, and the CBOR "Map"
* type is being decoded to JavaScript's `Map` type instead of, say, a basic Object as us JS
* developers might prefer.
*
* These types are an unorthodox way of saying "these Maps should involve these discrete lists of
* keys", but it works.
*/
export type COSEPublicKey = {
// Getters
get(key: COSEKEYS.kty): COSEKTY | undefined;
get(key: COSEKEYS.alg): COSEALG | undefined;
// Setters
set(key: COSEKEYS.kty, value: COSEKTY): void;
set(key: COSEKEYS.alg, value: COSEALG): void;
};
export type COSEPublicKeyOKP = COSEPublicKey & {
// Getters
get(key: COSEKEYS.crv): number | undefined;
get(key: COSEKEYS.x): Uint8Array | undefined;
// Setters
set(key: COSEKEYS.crv, value: number): void;
set(key: COSEKEYS.x, value: Uint8Array): void;
};
export type COSEPublicKeyEC2 = COSEPublicKey & {
// Getters
get(key: COSEKEYS.crv): number | undefined;
get(key: COSEKEYS.x): Uint8Array | undefined;
get(key: COSEKEYS.y): Uint8Array | undefined;
// Setters
set(key: COSEKEYS.crv, value: number): void;
set(key: COSEKEYS.x, value: Uint8Array): void;
set(key: COSEKEYS.y, value: Uint8Array): void;
};
export type COSEPublicKeyRSA = COSEPublicKey & {
// Getters
get(key: COSEKEYS.n): Uint8Array | undefined;
get(key: COSEKEYS.e): Uint8Array | undefined;
// Setters
set(key: COSEKEYS.n, value: Uint8Array): void;
set(key: COSEKEYS.e, value: Uint8Array): void;
};
export function isCOSEPublicKeyOKP(
cosePublicKey: COSEPublicKey,
): cosePublicKey is COSEPublicKeyOKP {
const kty = cosePublicKey.get(COSEKEYS.kty);
return isCOSEKty(kty) && kty === COSEKTY.OKP;
}
export function isCOSEPublicKeyEC2(
cosePublicKey: COSEPublicKey,
): cosePublicKey is COSEPublicKeyEC2 {
const kty = cosePublicKey.get(COSEKEYS.kty);
return isCOSEKty(kty) && kty === COSEKTY.EC2;
}
export function isCOSEPublicKeyRSA(
cosePublicKey: COSEPublicKey,
): cosePublicKey is COSEPublicKeyRSA {
const kty = cosePublicKey.get(COSEKEYS.kty);
return isCOSEKty(kty) && kty === COSEKTY.RSA;
}
/**
* COSE Keys
*
* https://www.iana.org/assignments/cose/cose.xhtml#key-common-parameters
* https://www.iana.org/assignments/cose/cose.xhtml#key-type-parameters
*/
export enum COSEKEYS {
kty = 1,
alg = 3,
crv = -1,
x = -2,
y = -3,
n = -1,
e = -2,
}
/**
* COSE Key Types
*
* https://www.iana.org/assignments/cose/cose.xhtml#key-type
*/
export enum COSEKTY {
OKP = 1,
EC2 = 2,
RSA = 3,
}
export function isCOSEKty(kty: number | undefined): kty is COSEKTY {
return Object.values(COSEKTY).indexOf(kty as COSEKTY) >= 0;
}
/**
* COSE Curves
*
* https://www.iana.org/assignments/cose/cose.xhtml#elliptic-curves
*/
export enum COSECRV {
P256 = 1,
P384 = 2,
P521 = 3,
ED25519 = 6,
SECP256K1 = 8,
}
export function isCOSECrv(crv: number | undefined): crv is COSECRV {
return Object.values(COSECRV).indexOf(crv as COSECRV) >= 0;
}
/**
* COSE Algorithms
*
* https://www.iana.org/assignments/cose/cose.xhtml#algorithms
*/
export enum COSEALG {
ES256 = -7,
EdDSA = -8,
ES384 = -35,
ES512 = -36,
PS256 = -37,
PS384 = -38,
PS512 = -39,
ES256K = -47,
RS256 = -257,
RS384 = -258,
RS512 = -259,
RS1 = -65535,
}
export function isCOSEAlg(alg: number | undefined): alg is COSEALG {
return Object.values(COSEALG).indexOf(alg as COSEALG) >= 0;
}
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