import type { CryptoSecretKey, CryptoPublicKey, OutputOptions } from "./types.js";
/**
 * Sign a message.
 *
 * The signature can be encoded
 *
 * * as plain string, with the value encoded, by default, in base64 or, on request, in base58
 * * as a Multibase string, with the value encoded, by default, in base58 or, on request, in base64
 *
 * Default for Multikeys is multibase with base58; plain string with base64 otherwise.
 *
 * @param message
 * @param userKeys - the private/public key pair
 * @param options - choice between signature result in multibase or plain, and between base64 or base58 encoding
 * @returns - signature in plain or multibase encoded format
 */
export declare function sign(message: string, userKeys: CryptoSecretKey, options?: OutputOptions): Promise<string>;
/**
 * Verify a signature.
 *
 * The option should be identical to the value used (if any) for signature, except that,
 * if the signature option refers to multibase, the values of encoding is ignored (and is deduced from the
 * multibase itself).
 *
 * @param message
 * @param signature
 * @param userKey
 * @param options - choice between signature result in multibase or plain, and between base64 or base58 encoding.
 */
export declare function verify(message: string, signature: string, userKey: CryptoPublicKey, options?: OutputOptions): Promise<boolean>;
/**
 * Encrypt a message.
 *
 * The generated ciphertext can be encoded
 *
 * * as plain string, with the value encoded, by default, in base64 or, on request, in base58.
 * * as a Multibase string, with the value encoded, by default, in base58 or, on request, in base64.
 *
 * Default is plain string with base64.
 *
 * @param message
 * @param userKey
 * @param options - choice between signature result in multibase or plain, and between base64 or base58 encoding
 * @return - ciphertext in plain or multibase encoded format
 */
export declare function encrypt(message: string, userKey: CryptoPublicKey, options?: OutputOptions): Promise<string>;
/**
 * Decrypt a ciphertext.
 *
 * The option should be identical to the value used (if any) for signature, except that,
 * if the signature option refers to multibase, the values of encoding is ignored (and is deduced from the
 * multibase itself).
 *
 * @param ciphertext
 * @param userKey
 * @param options - choice between signature result in multibase or plain, and between base64 or base58 encoding.
 */
export declare function decrypt(ciphertext: string, userKey: CryptoSecretKey, options?: OutputOptions): Promise<string>;
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