/**
 * Copyright (c) 2014 Baidu.com, Inc. All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * @file src/crypto.ts
 * @author leeight
 */
import { Readable } from 'stream';
/** 支持的字符编码类型 */
export type BufferEncoding = 'ascii' | 'utf8' | 'utf-8' | 'utf16le' | 'ucs2' | 'ucs-2' | 'base64' | 'base64url' | 'latin1' | 'binary' | 'hex';
/** 支持的摘要输出格式 */
export type DigestEncoding = 'base64' | 'base64url' | 'hex' | 'binary';
/**
 * 计算数据的 MD5 哈希值
 * @param data 要计算哈希的数据
 * @param enc 输入数据的编码方式
 * @param digest 输出摘要的格式
 * @returns MD5 哈希值
 */
export declare function md5sum(data: string | Buffer, enc?: BufferEncoding, digest?: DigestEncoding): string;
/**
 * 计算流的 MD5 哈希值
 * @param stream 可读流
 * @param digest 输出摘要的格式
 * @returns Promise，解析为 MD5 哈希值
 */
export declare function md5stream(stream: Readable, digest?: DigestEncoding): Promise<string>;
/**
 * 计算文件的 MD5 哈希值
 * @param filename 文件路径
 * @param digest 输出摘要的格式
 * @returns Promise，解析为 MD5 哈希值
 */
export declare function md5file(filename: string, digest?: DigestEncoding): Promise<string>;
/**
 * 计算 Blob 对象的 MD5 哈希值（仅在浏览器环境中可用）
 * @param blob Blob 对象
 * @param digest 输出摘要的格式
 * @returns Promise，解析为 MD5 哈希值
 */
export declare function md5blob(blob: Blob, digest?: DigestEncoding): Promise<string>;
/**
 * 创建 HMAC 签名
 * @param algorithm 哈希算法
 * @param key 密钥
 * @param data 要签名的数据
 * @param encoding 输出编码
 * @returns HMAC 签名
 */
export declare function hmac(algorithm: string, key: string | Buffer, data: string | Buffer, encoding?: DigestEncoding): string;
/**
 * 创建 SHA256 哈希
 * @param data 要哈希的数据
 * @param encoding 输出编码
 * @returns SHA256 哈希值
 */
export declare function sha256(data: string | Buffer, encoding?: DigestEncoding): string;
/**
 * 生成随机字符串
 * @param length 字符串长度
 * @param encoding 输出编码
 * @returns 随机字符串
 */
export declare function randomString(length?: number, encoding?: DigestEncoding): string;
declare const _default: {
    md5sum: typeof md5sum;
    md5stream: typeof md5stream;
    md5file: typeof md5file;
    md5blob: typeof md5blob;
    hmac: typeof hmac;
    sha256: typeof sha256;
    randomString: typeof randomString;
};
export default _default;
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