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Viewing file:     get_named_curve.js (3.19 KB)      -rw-r--r--

import { Buffer } from 'buffer';
import { createPublicKey, KeyObject } from 'crypto';
import { JOSENotSupported } from '../util/errors.js';
import { isCryptoKey } from './webcrypto.js';
import isKeyObject from './is_key_object.js';
import invalidKeyInput from '../lib/invalid_key_input.js';
import { types } from './is_key_like.js';
const p256 = Buffer.from([42, 134, 72, 206, 61, 3, 1, 7]);
const p384 = Buffer.from([43, 129, 4, 0, 34]);
const p521 = Buffer.from([43, 129, 4, 0, 35]);
const secp256k1 = Buffer.from([43, 129, 4, 0, 10]);
export const weakMap = new WeakMap();
const namedCurveToJOSE = (namedCurve) => {
    switch (namedCurve) {
        case 'prime256v1':
            return 'P-256';
        case 'secp384r1':
            return 'P-384';
        case 'secp521r1':
            return 'P-521';
        case 'secp256k1':
            return 'secp256k1';
        default:
            throw new JOSENotSupported('Unsupported key curve for this operation');
    }
};
const getNamedCurve = (kee, raw) => {
    var _a;
    let key;
    if (isCryptoKey(kee)) {
        key = KeyObject.from(kee);
    }
    else if (isKeyObject(kee)) {
        key = kee;
    }
    else {
        throw new TypeError(invalidKeyInput(kee, ...types));
    }
    if (key.type === 'secret') {
        throw new TypeError('only "private" or "public" type keys can be used for this operation');
    }
    switch (key.asymmetricKeyType) {
        case 'ed25519':
        case 'ed448':
            return `Ed${key.asymmetricKeyType.slice(2)}`;
        case 'x25519':
        case 'x448':
            return `X${key.asymmetricKeyType.slice(1)}`;
        case 'ec': {
            if (weakMap.has(key)) {
                return weakMap.get(key);
            }
            let namedCurve = (_a = key.asymmetricKeyDetails) === null || _a === void 0 ? void 0 : _a.namedCurve;
            if (!namedCurve && key.type === 'private') {
                namedCurve = getNamedCurve(createPublicKey(key), true);
            }
            else if (!namedCurve) {
                const buf = key.export({ format: 'der', type: 'spki' });
                const i = buf[1] < 128 ? 14 : 15;
                const len = buf[i];
                const curveOid = buf.slice(i + 1, i + 1 + len);
                if (curveOid.equals(p256)) {
                    namedCurve = 'prime256v1';
                }
                else if (curveOid.equals(p384)) {
                    namedCurve = 'secp384r1';
                }
                else if (curveOid.equals(p521)) {
                    namedCurve = 'secp521r1';
                }
                else if (curveOid.equals(secp256k1)) {
                    namedCurve = 'secp256k1';
                }
                else {
                    throw new JOSENotSupported('Unsupported key curve for this operation');
                }
            }
            if (raw)
                return namedCurve;
            const curve = namedCurveToJOSE(namedCurve);
            weakMap.set(key, curve);
            return curve;
        }
        default:
            throw new TypeError('Invalid asymmetric key type for this operation');
    }
};
export function setCurve(keyObject, curve) {
    weakMap.set(keyObject, curve);
}
export default getNamedCurve;