/**
 * Look up a content-encryption descriptor. Throws
 * {@link ErrorCode.UNSUPPORTED_ENCRYPTION} for anything not in the table.
 *
 * @param {string} enc
 * @returns {ContentEncryptionDescriptor}
 */
export function lookup(enc: string): ContentEncryptionDescriptor;
/** Every JWE `enc` identifier this package supports. */
export const SUPPORTED: readonly string[];
export type ContentEncryptionDescriptor = {
    /**
     * The JOSE `enc` identifier.
     */
    enc: string;
    /**
     * AEAD construction.
     */
    kind: "gcm" | "cbc-hs";
    /**
     * Total Content Encryption Key length in bytes.
     */
    cekBytes: number;
    /**
     * Initialization Vector length in bytes.
     */
    ivBytes: number;
    /**
     * Authentication Tag length in bytes.
     */
    tagBytes: number;
    /**
     * node:crypto cipher name for the AES step.
     */
    cipher: string;
    /**
     * HMAC hash (AES-CBC-HMAC only).
     */
    hash?: "sha256" | "sha512" | undefined;
};