const hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase        */
const chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode      */

// ---------- md5码

/*
 *  * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 *   * Digest Algorithm, as defined in RFC 1321.
 *    * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
 *     * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 *      * Distributed under the BSD License
 *       * See http://pajhome.org.uk/crypt/md5 for more info.
 *        */

/*
 *  * Configurable letiables. You may need to tweak these to be compatible with
 *   * the server-side, but the defaults work in most cases.
 *    */

/*
 *  * These are the functions you'll usually want to call
 *   * They take string arguments and return either hex or base-64 encoded strings
 *    */
export function hex_md5(s: string) {
    return binl2hex(core_md5(str2binl(s), s.length * chrsz));
}

/*
 *  * Calculate the MD5 of an array of little-endian words, and a bit length
 *   */
function core_md5(x: any[], len: number) {
    /* append padding */
    x[len >> 5] |= 0x80 << len % 32;
    x[(((len + 64) >>> 9) << 4) + 14] = len;

    let a = 1732584193;
    let b = -271733879;
    let c = -1732584194;
    let d = 271733878;

    for (let i = 0; i < x.length; i += 16) {
        const olda = a;
        const oldb = b;
        const oldc = c;
        const oldd = d;

        a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
        d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
        c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
        b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
        a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
        d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
        c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
        b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
        a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
        d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
        c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
        b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
        a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
        d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
        c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
        b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);

        a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
        d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
        c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
        b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
        a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
        d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
        c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
        b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
        a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
        d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
        c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
        b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
        a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
        d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
        c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
        b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);

        a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
        d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
        c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
        b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
        a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
        d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
        c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
        b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
        a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
        d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
        c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
        b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
        a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
        d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
        c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
        b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);

        a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
        d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
        c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
        b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
        a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
        d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
        c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
        b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
        a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
        d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
        c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
        b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
        a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
        d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
        c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
        b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);

        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd);
    }
    return Array(a, b, c, d);
}

/*
 *  * These functions implement the four basic operations the algorithm uses.
 *   */
function md5_cmn(q: number, a: any, b: any, x: any, s: any, t: any) {
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
}
function md5_ff(
    a: number,
    b: number,
    c: number,
    d: number,
    x: any,
    s: number,
    t: number
) {
    return md5_cmn((b & c) | (~b & d), a, b, x, s, t);
}
function md5_gg(
    a: number,
    b: number,
    c: number,
    d: number,
    x: any,
    s: number,
    t: number
) {
    return md5_cmn((b & d) | (c & ~d), a, b, x, s, t);
}
function md5_hh(
    a: number,
    b: number,
    c: number,
    d: number,
    x: any,
    s: number,
    t: number
) {
    return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(
    a: number,
    b: number,
    c: number,
    d: number,
    x: any,
    s: number,
    t: number
) {
    return md5_cmn(c ^ (b | ~d), a, b, x, s, t);
}

/*
 *  * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 *   * to work around bugs in some JS interpreters.
 *    */
function safe_add(x: number, y: number) {
    const lsw = (x & 0xffff) + (y & 0xffff);
    const msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xffff);
}

/*
 *  * Bitwise rotate a 32-bit number to the left.
 *   */
function bit_rol(num: number, cnt: number) {
    return (num << cnt) | (num >>> (32 - cnt));
}

/*
 *  * Convert a string to an array of little-endian words
 *   * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 *    */
function str2binl(str: string) {
    let bin = Array();
    let mask = (1 << chrsz) - 1;
    for (let i = 0; i < str.length * chrsz; i += chrsz)
        bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << i % 32;
    return bin;
}

/*
 *  * Convert an array of little-endian words to a hex string.
 *   */
function binl2hex(binarray: string | any[]) {
    let hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef';
    let str = '';
    for (let i = 0; i < binarray.length * 4; i++) {
        str +=
            hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xf) +
            hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xf);
    }
    return str;
}