import { JOSENotSupported } from '../util/errors.js';
import random from '../runtime/random.js';
export function bitLength(alg) {
    switch (alg) {
        case 'A128GCM':
        case 'A128GCMKW':
        case 'A192GCM':
        case 'A192GCMKW':
        case 'A256GCM':
        case 'A256GCMKW':
            return 96;
        case 'A128CBC-HS256':
        case 'A192CBC-HS384':
        case 'A256CBC-HS512':
            return 128;
        default:
            throw new JOSENotSupported(`Unsupported JWE Algorithm: ${alg}`);
    }
}
export default (alg) => random(new Uint8Array(bitLength(alg) >> 3));