// 主MD5哈希函数，接收字符串输入并返回其MD5哈希值
function r(r) {
    // 将输入字符串转换为字节数组，并计算MD5哈希值
    return i(t(a(r), 8 * r.length))
}

// MD5核心处理函数，执行MD5算法的主要计算过程
function t(r, t) {
    // 添加填充位（1位'1'和若干位'0'）
    r[t >> 5] |= 128 << t % 32,
    // 添加原始消息长度（以位为单位）
    r[14 + (t + 64 >>> 9 << 4)] = t;

    // 初始化MD5缓冲区的四个32位字
    for (var n = 1732584193, a = -271733879, i = -1732584194, l = 271733878, v = 0; v < r.length; v += 16) {
        // 保存当前缓冲区值
        var d = n, h = a, s = i, A = l;

        // 第一轮运算（16步）
        n = e(n, a, i, l, r[v + 0], 7, -680876936),
        l = e(l, n, a, i, r[v + 1], 12, -389564586),
        i = e(i, l, n, a, r[v + 2], 17, 606105819),
        a = e(a, i, l, n, r[v + 3], 22, -1044525330),
        n = e(n, a, i, l, r[v + 4], 7, -176418897),
        l = e(l, n, a, i, r[v + 5], 12, 1200080426),
        i = e(i, l, n, a, r[v + 6], 17, -1473231341),
        a = e(a, i, l, n, r[v + 7], 22, -45705983),
        n = e(n, a, i, l, r[v + 8], 7, 1770035416),
        l = e(l, n, a, i, r[v + 9], 12, -1958414417),
        i = e(i, l, n, a, r[v + 10], 17, -42063),
        a = e(a, i, l, n, r[v + 11], 22, -1990404162),
        n = e(n, a, i, l, r[v + 12], 7, 1804603682),
        l = e(l, n, a, i, r[v + 13], 12, -40341101),
        i = e(i, l, n, a, r[v + 14], 17, -1502002290),
        n = u(n, a = e(a, i, l, n, r[v + 15], 22, 1236535329), i, l, r[v + 1], 5, -165796510),

        // 第二轮运算（16步）
        l = u(l, n, a, i, r[v + 6], 9, -1069501632),
        i = u(i, l, n, a, r[v + 11], 14, 643717713),
        a = u(a, i, l, n, r[v + 0], 20, -373897302),
        n = u(n, a, i, l, r[v + 5], 5, -701558691),
        l = u(l, n, a, i, r[v + 10], 9, 38016083),
        i = u(i, l, n, a, r[v + 15], 14, -660478335),
        a = u(a, i, l, n, r[v + 4], 20, -405537848),
        n = u(n, a, i, l, r[v + 9], 5, 568446438),
        l = u(l, n, a, i, r[v + 14], 9, -1019803690),
        i = u(i, l, n, a, r[v + 3], 14, -187363961),
        a = u(a, i, l, n, r[v + 8], 20, 1163531501),
        n = u(n, a, i, l, r[v + 13], 5, -1444681467),
        l = u(l, n, a, i, r[v + 2], 9, -51403784),
        i = u(i, l, n, a, r[v + 7], 14, 1735328473),
        n = o(n, a = u(a, i, l, n, r[v + 12], 20, -1926607734), i, l, r[v + 5], 4, -378558),

        // 第三轮运算（16步）
        l = o(l, n, a, i, r[v + 8], 11, -2022574463),
        i = o(i, l, n, a, r[v + 11], 16, 1839030562),
        a = o(a, i, l, n, r[v + 14], 23, -35309556),
        n = o(n, a, i, l, r[v + 1], 4, -1530992060),
        l = o(l, n, a, i, r[v + 4], 11, 1272893353),
        i = o(i, l, n, a, r[v + 7], 16, -155497632),
        a = o(a, i, l, n, r[v + 10], 23, -1094730640),
        n = o(n, a, i, l, r[v + 13], 4, 681279174),
        l = o(l, n, a, i, r[v + 0], 11, -358537222),
        i = o(i, l, n, a, r[v + 3], 16, -722521979),
        a = o(a, i, l, n, r[v + 6], 23, 76029189),
        n = o(n, a, i, l, r[v + 9], 4, -640364487),
        l = o(l, n, a, i, r[v + 12], 11, -421815835),
        i = o(i, l, n, a, r[v + 15], 16, 530742520),
        n = f(n, a = o(a, i, l, n, r[v + 2], 23, -995338651), i, l, r[v + 0], 6, -198630844),

        // 第四轮运算（16步）
        l = f(l, n, a, i, r[v + 7], 10, 1126891415),
        i = f(i, l, n, a, r[v + 14], 15, -1416354905),
        a = f(a, i, l, n, r[v + 5], 21, -57434055),
        n = f(n, a, i, l, r[v + 12], 6, 1700485571),
        l = f(l, n, a, i, r[v + 3], 10, -1894986606),
        i = f(i, l, n, a, r[v + 10], 15, -1051523),
        a = f(a, i, l, n, r[v + 1], 21, -2054922799),
        n = f(n, a, i, l, r[v + 8], 6, 1873313359),
        l = f(l, n, a, i, r[v + 15], 10, -30611744),
        i = f(i, l, n, a, r[v + 6], 15, -1560198380),
        a = f(a, i, l, n, r[v + 13], 21, 1309151649),
        n = f(n, a, i, l, r[v + 4], 6, -145523070),
        l = f(l, n, a, i, r[v + 11], 10, -1120210379),
        i = f(i, l, n, a, r[v + 2], 15, 718787259),
        a = f(a, i, l, n, r[v + 9], 21, -343485551),

        // 更新缓冲区
        n = c(n, d),
        a = c(a, h),
        i = c(i, s),
        l = c(l, A)
    }
    // 返回最终的哈希值
    return Array(n, a, i, l)
}

// 基本MD5操作函数 - 执行循环左移和加法操作
function n(r, t, n, e, u, o) {
    // 执行循环左移和加法运算
    return c((f = c(c(t, r), c(e, o))) << (a = u) | f >>> 32 - a, n);
    var f, a
}

// 第一轮函数 F(b,c,d) = (b & c) | (~b & d)
function e(r, t, e, u, o, f, c) {
    return n(t & e | ~t & u, r, t, o, f, c)
}

// 第二轮函数 G(b,c,d) = (b & d) | (c & ~d)
function u(r, t, e, u, o, f, c) {
    return n(t & u | e & ~u, r, t, o, f, c)
}

// 第三轮函数 H(b,c,d) = b ^ c ^ d
function o(r, t, e, u, o, f, c) {
    return n(t ^ e ^ u, r, t, o, f, c)
}

// 第四轮函数 I(b,c,d) = c ^ (b | ~d)
function f(r, t, e, u, o, f, c) {
    return n(e ^ (t | ~u), r, t, o, f, c)
}

// 32位加法运算（模2^32）
function c(r, t) {
    var n = (65535 & r) + (65535 & t);
    return (r >> 16) + (t >> 16) + (n >> 16) << 16 | 65535 & n
}

// 将字符串转换为32位字数组
function a(r) {
    for (var t = Array(), n = 0; n < 8 * r.length; n += 8)
        t[n >> 5] |= (255 & r.charCodeAt(n / 8)) << n % 32;
    return t
}

// 将32位字数组转换为十六进制字符串
function i(r) {
    for (var t = "0123456789abcdef", n = "", e = 0; e < 4 * r.length; e++)
        n += t.charAt(r[e >> 2] >> e % 4 * 8 + 4 & 15) + t.charAt(r[e >> 2] >> e % 4 * 8 & 15);
    return n
}