/**
 * Look up a key-management descriptor. Throws
 * {@link ErrorCode.UNSUPPORTED_ALGORITHM} for anything not in the table,
 * including the deliberately-excluded `RSA1_5`.
 *
 * @param {string} alg
 * @returns {KeyManagementDescriptor}
 */
export function lookup(alg: string): KeyManagementDescriptor;
/** Every JWE `alg` identifier this package supports. */
export const SUPPORTED: readonly string[];
export type KeyManagementDescriptor = {
    /**
     * The JOSE `alg` identifier.
     */
    alg: string;
    /**
     * Wrap family.
     */
    kind: "rsa" | "aeskw" | "ecdh" | "dir";
    /**
     * OAEP hash (RSA family only).
     */
    hash?: "sha1" | "sha256" | undefined;
    /**
     * AES key-wrap KEK size in bits (AES-KW only).
     */
    bits?: number | undefined;
    /**
     * CEK wrap step for ECDH-ES
     * (`null` = ECDH-ES direct, the derived secret *is* the CEK).
     */
    wrap?: "A128KW" | "A256KW" | null | undefined;
};