import { isCloudflareWorkers, isNodeJs } from './env.js';
import { JOSENotSupported } from '../util/errors.js';
export default function subtleDsa(alg, namedCurve) {
    const length = parseInt(alg.substr(-3), 10);
    switch (alg) {
        case 'HS256':
        case 'HS384':
        case 'HS512':
            return { hash: `SHA-${length}`, name: 'HMAC' };
        case 'PS256':
        case 'PS384':
        case 'PS512':
            return { hash: `SHA-${length}`, name: 'RSA-PSS', saltLength: length >> 3 };
        case 'RS256':
        case 'RS384':
        case 'RS512':
            return { hash: `SHA-${length}`, name: 'RSASSA-PKCS1-v1_5' };
        case 'ES256':
        case 'ES384':
        case 'ES512':
            return { hash: `SHA-${length}`, name: 'ECDSA', namedCurve };
        case (isCloudflareWorkers() || isNodeJs()) && 'EdDSA':
            return { name: namedCurve, namedCurve };
        default:
            throw new JOSENotSupported(`alg ${alg} is not supported either by JOSE or your javascript runtime`);
    }
}