虫术
目录

MD5

关于 MD5 信息摘要算法

MD5 信息摘要算法（英语：MD5 Message-Digest Algorithm），一种被广泛使用的密码散列函数，可以产生出一个 128 位（16 字节）的散列值（hash value），用于确保信息传输完整一致。MD5 由美国密码学家罗纳德·李维斯特（Ronald Linn Rivest）设计，于 1992 年公开，用以取代 MD4 算法。这套算法的程序在 RFC 1321 (opens new window) 标准中被加以规范。一个数据的 MD5 值是唯一的，同一个数据不可能计算出多个不同的 MD5 值，但是，不同数据计算出来的 MD5 值是有可能一样的，知道一个 MD5 值，理论上是无法还原出它的原始数据的，但 1996 年后该算法被证实存在弱点，可以被加以破解，对于需要高度安全性的数据，专家一般建议改用其他算法，如 SHA-2。2004 年，证实 MD5 算法无法防止碰撞（collision），因此不适用于安全性认证，如 SSL 公开密钥认证或是数字签名等用途。

MD5 维基百科 (opens new window)

# Python 3.0+

    # 方法一：直接使用 md5 函数

import hashlib


data = "spiderapi.cn - 虫术"

result_lowercase_32bit = hashlib.md5(data.encode()).hexdigest()
result_uppercase_32bit = result_lowercase_32bit.upper()
result_lowercase_16bit = result_lowercase_32bit[8:-8]
result_uppercase_16bit = result_lowercase_16bit.upper()

print("32 位小写值: ", result_lowercase_32bit)
print("32 位大写值: ", result_uppercase_32bit)
print("16 位小写值: ", result_lowercase_16bit)
print("16 位大写值: ", result_uppercase_16bit)
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    # 方法二：使用 new 函数创建 md5 对象

import hashlib


data = "spiderapi.cn - 虫术"

result_lowercase_32bit = hashlib.new("md5", data.encode()).hexdigest()
result_uppercase_32bit = result_lowercase_32bit.upper()
result_lowercase_16bit = result_lowercase_32bit[8:-8]
result_uppercase_16bit = result_lowercase_16bit.upper()

print("32 位小写值: ", result_lowercase_32bit)
print("32 位大写值: ", result_uppercase_32bit)
print("16 位小写值: ", result_lowercase_16bit)
print("16 位大写值: ", result_uppercase_16bit)
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    #  方法三：通过 update 方法更新 md5 对象

import hashlib


data = "spiderapi.cn - 虫术"

hash_object = hashlib.md5()
hash_object.update(data.encode())
result_lowercase_32bit = hash_object.hexdigest()
result_uppercase_32bit = result_lowercase_32bit.upper()
result_lowercase_16bit = result_lowercase_32bit[8:-8]
result_uppercase_16bit = result_lowercase_16bit.upper()

print("32 位小写值: ", result_lowercase_32bit)
print("32 位大写值: ", result_uppercase_32bit)
print("16 位小写值: ", result_lowercase_16bit)
print("16 位大写值: ", result_uppercase_16bit)
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    # encoding 支持多种编码

import hashlib


data = "spiderapi.cn - 虫术"

result_utf8 = hashlib.md5(data.encode(encoding="UTF-8")).hexdigest()
print("encoding utf-8:", result_utf8)

result_gbk = hashlib.md5(data.encode(encoding="GBK")).hexdigest()
print("encoding gbk:", result_gbk)

result_gb2312 = hashlib.md5(data.encode(encoding="GB2312")).hexdigest()
print("encoding gb2312:", result_gb2312)

result_18030 = hashlib.md5(data.encode(encoding="GB18030")).hexdigest()
print("encoding gb18030:", result_18030)
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    # 不借助官方或者第三方库，纯源码实现

import binascii


SV = [0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf,
    0x4787c62a, 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af,
    0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e,
    0x49b40821, 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
    0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8, 0x21e1cde6,
    0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8,
    0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122,
    0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
    0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05, 0xd9d4d039,
    0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, 0xf4292244, 0x432aff97,
    0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d,
    0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
    0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391]


def left_circular_shift(k, bits):
    bits = bits % 32
    k = k % (2 ** 32)
    upper = (k << bits) % (2 ** 32)
    result = upper | (k >> (32 - bits))
    return result


def block_divide(block, chunks):
    result = []
    size = len(block) // chunks
    for i in range(0, chunks):
        result.append(int.from_bytes(block[i * size:(i + 1) * size], byteorder="little"))
    return result


def F(X, Y, Z):
    return (X & Y) | ((~X) & Z)


def G(X, Y, Z):
    return (X & Z) | (Y & (~Z))


def H(X, Y, Z):
    return X ^ Y ^ Z


def I(X, Y, Z):
    return Y ^ (X | (~Z))


def FF(a, b, c, d, M, s, t):
    result = b + left_circular_shift((a + F(b, c, d) + M + t), s)
    return result


def GG(a, b, c, d, M, s, t):
    result = b + left_circular_shift((a + G(b, c, d) + M + t), s)
    return result


def HH(a, b, c, d, M, s, t):
    result = b + left_circular_shift((a + H(b, c, d) + M + t), s)
    return result


def II(a, b, c, d, M, s, t):
    result = b + left_circular_shift((a + I(b, c, d) + M + t), s)
    return result


def fmt8(num):
    big_hex = "{0:08x}".format(num)
    unhex = binascii.unhexlify(big_hex)
    result = "{0:08x}".format(int.from_bytes(unhex, byteorder='little'))
    return result


def bit_len(bitstring):
    return len(bitstring) * 8


def md5_hash(msg):
    # First, we pad the message
    msg_len = bit_len(msg) % (2 ** 64)
    msg = msg + b'\x80'
    zero_pad = (448 - (msg_len + 8) % 512) % 512
    zero_pad //= 8
    msg = msg + b'\x00' * zero_pad + msg_len.to_bytes(8, byteorder='little')
    msg_len = bit_len(msg)
    iterations = msg_len // 512
    # chaining variables
    A = 0x67452301
    B = 0xefcdab89
    C = 0x98badcfe
    D = 0x10325476
    # main loop
    for i in range(0, iterations):
        a = A
        b = B
        c = C
        d = D
        block = msg[i * 64:(i + 1) * 64]
        M = block_divide(block, 16)
        # Rounds
        a = FF(a, b, c, d, M[0], 7, SV[0])
        d = FF(d, a, b, c, M[1], 12, SV[1])
        c = FF(c, d, a, b, M[2], 17, SV[2])
        b = FF(b, c, d, a, M[3], 22, SV[3])
        a = FF(a, b, c, d, M[4], 7, SV[4])
        d = FF(d, a, b, c, M[5], 12, SV[5])
        c = FF(c, d, a, b, M[6], 17, SV[6])
        b = FF(b, c, d, a, M[7], 22, SV[7])
        a = FF(a, b, c, d, M[8], 7, SV[8])
        d = FF(d, a, b, c, M[9], 12, SV[9])
        c = FF(c, d, a, b, M[10], 17, SV[10])
        b = FF(b, c, d, a, M[11], 22, SV[11])
        a = FF(a, b, c, d, M[12], 7, SV[12])
        d = FF(d, a, b, c, M[13], 12, SV[13])
        c = FF(c, d, a, b, M[14], 17, SV[14])
        b = FF(b, c, d, a, M[15], 22, SV[15])
        a = GG(a, b, c, d, M[1], 5, SV[16])
        d = GG(d, a, b, c, M[6], 9, SV[17])
        c = GG(c, d, a, b, M[11], 14, SV[18])
        b = GG(b, c, d, a, M[0], 20, SV[19])
        a = GG(a, b, c, d, M[5], 5, SV[20])
        d = GG(d, a, b, c, M[10], 9, SV[21])
        c = GG(c, d, a, b, M[15], 14, SV[22])
        b = GG(b, c, d, a, M[4], 20, SV[23])
        a = GG(a, b, c, d, M[9], 5, SV[24])
        d = GG(d, a, b, c, M[14], 9, SV[25])
        c = GG(c, d, a, b, M[3], 14, SV[26])
        b = GG(b, c, d, a, M[8], 20, SV[27])
        a = GG(a, b, c, d, M[13], 5, SV[28])
        d = GG(d, a, b, c, M[2], 9, SV[29])
        c = GG(c, d, a, b, M[7], 14, SV[30])
        b = GG(b, c, d, a, M[12], 20, SV[31])
        a = HH(a, b, c, d, M[5], 4, SV[32])
        d = HH(d, a, b, c, M[8], 11, SV[33])
        c = HH(c, d, a, b, M[11], 16, SV[34])
        b = HH(b, c, d, a, M[14], 23, SV[35])
        a = HH(a, b, c, d, M[1], 4, SV[36])
        d = HH(d, a, b, c, M[4], 11, SV[37])
        c = HH(c, d, a, b, M[7], 16, SV[38])
        b = HH(b, c, d, a, M[10], 23, SV[39])
        a = HH(a, b, c, d, M[13], 4, SV[40])
        d = HH(d, a, b, c, M[0], 11, SV[41])
        c = HH(c, d, a, b, M[3], 16, SV[42])
        b = HH(b, c, d, a, M[6], 23, SV[43])
        a = HH(a, b, c, d, M[9], 4, SV[44])
        d = HH(d, a, b, c, M[12], 11, SV[45])
        c = HH(c, d, a, b, M[15], 16, SV[46])
        b = HH(b, c, d, a, M[2], 23, SV[47])
        a = II(a, b, c, d, M[0], 6, SV[48])
        d = II(d, a, b, c, M[7], 10, SV[49])
        c = II(c, d, a, b, M[14], 15, SV[50])
        b = II(b, c, d, a, M[5], 21, SV[51])
        a = II(a, b, c, d, M[12], 6, SV[52])
        d = II(d, a, b, c, M[3], 10, SV[53])
        c = II(c, d, a, b, M[10], 15, SV[54])
        b = II(b, c, d, a, M[1], 21, SV[55])
        a = II(a, b, c, d, M[8], 6, SV[56])
        d = II(d, a, b, c, M[15], 10, SV[57])
        c = II(c, d, a, b, M[6], 15, SV[58])
        b = II(b, c, d, a, M[13], 21, SV[59])
        a = II(a, b, c, d, M[4], 6, SV[60])
        d = II(d, a, b, c, M[11], 10, SV[61])
        c = II(c, d, a, b, M[2], 15, SV[62])
        b = II(b, c, d, a, M[9], 21, SV[63])
        A = (A + a) % (2 ** 32)
        B = (B + b) % (2 ** 32)
        C = (C + c) % (2 ** 32)
        D = (D + d) % (2 ** 32)
    result = fmt8(A) + fmt8(B) + fmt8(C) + fmt8(D)
    return result


if __name__ == "__main__":
    data = 'spiderapi.cn - 虫术'

    result_lowercase_32bit = md5_hash(data.encode())
    result_uppercase_32bit = result_lowercase_32bit.upper()
    result_lowercase_16bit = result_lowercase_32bit[8:-8]
    result_uppercase_16bit = result_lowercase_16bit.upper()

    print("32 位小写值: ", result_lowercase_32bit)  # 4040361f7f0d278bf2781451e0639619
    print("32 位大写值: ", result_uppercase_32bit)  # 4040361F7F0D278BF2781451E0639619
    print("16 位小写值: ", result_lowercase_16bit)  # 7f0d278bf2781451
    print("16 位大写值: ", result_uppercase_16bit)  # 7F0D278BF2781451
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    // Make sure to add code blocks to your code group

    # JavaScript Node.js ECMAScript 5.1+

      // 安装依赖 npm install crypto-js

var CryptoJS = require("crypto-js");

var data = "spiderapi.cn - 虫术";
var resultLowercase32bit = CryptoJS.MD5(data).toString(CryptoJS.enc.Hex);
var resultUppercase32bit = resultLowercase32bit.toUpperCase();
var resultLowercase16bit = resultLowercase32bit.slice(8, 24);
var resultUppercase16bit = resultLowercase16bit.toUpperCase();

console.log("32 位小写值:", resultLowercase32bit);
console.log("32 位大写值:", resultUppercase32bit);
console.log("16 位小写值:", resultLowercase16bit);
console.log("16 位大写值:", resultUppercase16bit);
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      // 安装依赖 npm install crypto

var crypto = require("crypto");

var data = "spiderapi.cn - 虫术";
var hashObject = crypto.createHash("md5");
hashObject.update(data);
var resultLowercase32bit = hashObject.digest("hex");
var resultUppercase32bit = resultLowercase32bit.toUpperCase();
var resultLowercase16bit = resultLowercase32bit.slice(8, 24);
var resultUppercase16bit = resultLowercase16bit.toUpperCase();

console.log("32 位小写值:", resultLowercase32bit);
console.log("32 位大写值:", resultUppercase32bit);
console.log("16 位小写值:", resultLowercase16bit);
console.log("16 位大写值:", resultUppercase16bit);
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      // 安装依赖 npm install md5

var MD5 = require("md5");

var data = "spiderapi.cn - 虫术";
var resultLowercase32bit = MD5(data);
var resultUppercase32bit = resultLowercase32bit.toUpperCase();
var resultLowercase16bit = resultLowercase32bit.slice(8, 24);
var resultUppercase16bit = resultLowercase16bit.toUpperCase();

console.log("32 位小写值:", resultLowercase32bit);
console.log("32 位大写值:", resultUppercase32bit);
console.log("16 位小写值:", resultLowercase16bit);
console.log("16 位大写值:", resultUppercase16bit);
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      // 不借助官方或者第三方库，纯源码实现

var CryptoJS = CryptoJS || (function (Math, undefined) {
    var crypto;
    if (typeof window !== 'undefined' && window.crypto) {
        crypto = window.crypto;
    }
    if (typeof self !== 'undefined' && self.crypto) {
        crypto = self.crypto;
    }
    if (typeof globalThis !== 'undefined' && globalThis.crypto) {
        crypto = globalThis.crypto;
    }
    if (!crypto && typeof window !== 'undefined' && window.msCrypto) {
        crypto = window.msCrypto;
    }
    if (!crypto && typeof global !== 'undefined' && global.crypto) {
        crypto = global.crypto;
    }
    if (!crypto && typeof require === 'function') {
        try {
            crypto = require('crypto');
        } catch (err) {}
    }
    var cryptoSecureRandomInt = function () {
        if (crypto) {
            if (typeof crypto.getRandomValues === 'function') {
                try {
                    return crypto.getRandomValues(new Uint32Array(1))[0];
                } catch (err) {}
            }
            if (typeof crypto.randomBytes === 'function') {
                try {
                    return crypto.randomBytes(4).readInt32LE();
                } catch (err) {}
            }
        }
        throw new Error('Native crypto module could not be used to get secure random number.');
    };
    var create = Object.create || (function () {
        function F() {}
        return function (obj) {
            var subtype;
            F.prototype = obj;
            subtype = new F();
            F.prototype = null;
            return subtype;
        };
    }());
    var C = {};
    var C_lib = C.lib = {};
    var Base = C_lib.Base = (function () {
        return {
            extend: function (overrides) {
                var subtype = create(this);
                if (overrides) {
                    subtype.mixIn(overrides);
                }
                if (!subtype.hasOwnProperty('init') || this.init === subtype.init) {
                    subtype.init = function () {
                        subtype.$super.init.apply(this, arguments);
                    };
                }
                subtype.init.prototype = subtype;
                subtype.$super = this;
                return subtype;
            }, create: function () {
                var instance = this.extend();
                instance.init.apply(instance, arguments);
                return instance;
            }, init: function () {}, mixIn: function (properties) {
                for (var propertyName in properties) {
                    if (properties.hasOwnProperty(propertyName)) {
                        this[propertyName] = properties[propertyName];
                    }
                }
                if (properties.hasOwnProperty('toString')) {
                    this.toString = properties.toString;
                }
            }, clone: function () {
                return this.init.prototype.extend(this);
            }
        };
    }());
    var WordArray = C_lib.WordArray = Base.extend({
        init: function (words, sigBytes) {
            words = this.words = words || [];
            if (sigBytes != undefined) {
                this.sigBytes = sigBytes;
            } else {
                this.sigBytes = words.length * 4;
            }
        }, toString: function (encoder) {
            return (encoder || Hex).stringify(this);
        }, concat: function (wordArray) {
            var thisWords = this.words;
            var thatWords = wordArray.words;
            var thisSigBytes = this.sigBytes;
            var thatSigBytes = wordArray.sigBytes;
            this.clamp();
            if (thisSigBytes % 4) {
                for (var i = 0; i < thatSigBytes; i++) {
                    var thatByte = (thatWords[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                    thisWords[(thisSigBytes + i) >>> 2] |= thatByte << (24 - ((thisSigBytes + i) % 4) * 8);
                }
            } else {
                for (var j = 0; j < thatSigBytes; j += 4) {
                    thisWords[(thisSigBytes + j) >>> 2] = thatWords[j >>> 2];
                }
            }
            this.sigBytes += thatSigBytes;
            return this;
        }, clamp: function () {
            var words = this.words;
            var sigBytes = this.sigBytes;
            words[sigBytes >>> 2] &= 0xffffffff << (32 - (sigBytes % 4) * 8);
            words.length = Math.ceil(sigBytes / 4);
        }, clone: function () {
            var clone = Base.clone.call(this);
            clone.words = this.words.slice(0);
            return clone;
        }, random: function (nBytes) {
            var words = [];
            var r = (function (m_w) {
                var m_w = m_w;
                var m_z = 0x3ade68b1;
                var mask = 0xffffffff;
                return function () {
                    m_z = (0x9069 * (m_z & 0xFFFF) + (m_z >> 0x10)) & mask;
                    m_w = (0x4650 * (m_w & 0xFFFF) + (m_w >> 0x10)) & mask;
                    var result = ((m_z << 0x10) + m_w) & mask;
                    result /= 0x100000000;
                    result += 0.5;
                    return result * (Math.random() > .5 ? 1 : -1);
                }
            });
            var RANDOM = false, _r;
            try {
                cryptoSecureRandomInt();
                RANDOM = true;
            } catch (err) {}
            for (var i = 0, rcache; i < nBytes; i += 4) {
                if (!RANDOM) {
                    _r = r((rcache || Math.random()) * 0x100000000);
                    rcache = _r() * 0x3ade67b7;
                    words.push((_r() * 0x100000000) | 0);
                    continue;
                }
                words.push(cryptoSecureRandomInt());
            }
            return new WordArray.init(words, nBytes);
        }
    });
    var C_enc = C.enc = {};
    var Hex = C_enc.Hex = {
        stringify: function (wordArray) {
            var words = wordArray.words;
            var sigBytes = wordArray.sigBytes;
            var hexChars = [];
            for (var i = 0; i < sigBytes; i++) {
                var bite = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                hexChars.push((bite >>> 4).toString(16));
                hexChars.push((bite & 0x0f).toString(16));
            }
            return hexChars.join('');
        }, parse: function (hexStr) {
            var hexStrLength = hexStr.length;
            var words = [];
            for (var i = 0; i < hexStrLength; i += 2) {
                words[i >>> 3] |= parseInt(hexStr.substr(i, 2), 16) << (24 - (i % 8) * 4);
            }
            return new WordArray.init(words, hexStrLength / 2);
        }
    };
    var Latin1 = C_enc.Latin1 = {
        stringify: function (wordArray) {
            var words = wordArray.words;
            var sigBytes = wordArray.sigBytes;
            var latin1Chars = [];
            for (var i = 0; i < sigBytes; i++) {
                var bite = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
                latin1Chars.push(String.fromCharCode(bite));
            }
            return latin1Chars.join('');
        }, parse: function (latin1Str) {
            var latin1StrLength = latin1Str.length;
            var words = [];
            for (var i = 0; i < latin1StrLength; i++) {
                words[i >>> 2] |= (latin1Str.charCodeAt(i) & 0xff) << (24 - (i % 4) * 8);
            }
            return new WordArray.init(words, latin1StrLength);
        }
    };
    var Utf8 = C_enc.Utf8 = {
        stringify: function (wordArray) {
            try {
                return decodeURIComponent(escape(Latin1.stringify(wordArray)));
            } catch (e) {
                throw new Error('Malformed UTF-8 data');
            }
        }, parse: function (utf8Str) {
            return Latin1.parse(unescape(encodeURIComponent(utf8Str)));
        }
    };
    var BufferedBlockAlgorithm = C_lib.BufferedBlockAlgorithm = Base.extend({
        reset: function () {
            this._data = new WordArray.init();
            this._nDataBytes = 0;
        }, _append: function (data) {
            if (typeof data == 'string') {
                data = Utf8.parse(data);
            }
            this._data.concat(data);
            this._nDataBytes += data.sigBytes;
        }, _process: function (doFlush) {
            var processedWords;
            var data = this._data;
            var dataWords = data.words;
            var dataSigBytes = data.sigBytes;
            var blockSize = this.blockSize;
            var blockSizeBytes = blockSize * 4;
            var nBlocksReady = dataSigBytes / blockSizeBytes;
            if (doFlush) {
                nBlocksReady = Math.ceil(nBlocksReady);
            } else {
                nBlocksReady = Math.max((nBlocksReady | 0) - this._minBufferSize, 0);
            }
            var nWordsReady = nBlocksReady * blockSize;
            var nBytesReady = Math.min(nWordsReady * 4, dataSigBytes);
            if (nWordsReady) {
                for (var offset = 0; offset < nWordsReady; offset += blockSize) {
                    this._doProcessBlock(dataWords, offset);
                }
                processedWords = dataWords.splice(0, nWordsReady);
                data.sigBytes -= nBytesReady;
            }
            return new WordArray.init(processedWords, nBytesReady);
        }, clone: function () {
            var clone = Base.clone.call(this);
            clone._data = this._data.clone();
            return clone;
        }, _minBufferSize: 0
    });
    var Hasher = C_lib.Hasher = BufferedBlockAlgorithm.extend({
        cfg: Base.extend(),
        init: function (cfg) {
            this.cfg = this.cfg.extend(cfg);
            this.reset();
        }, reset: function () {
            BufferedBlockAlgorithm.reset.call(this);
            this._doReset();
        }, update: function (messageUpdate) {
            this._append(messageUpdate);
            this._process();
            return this;
        }, finalize: function (messageUpdate) {
            if (messageUpdate) {
                this._append(messageUpdate);
            }
            var hash = this._doFinalize();
            return hash;
        }, blockSize: 512 / 32,
        _createHelper: function (hasher) {
            return function (message, cfg) {
                return new hasher.init(cfg).finalize(message);
            };
        }, _createHmacHelper: function (hasher) {
            return function (message, key) {
                return new C_algo.HMAC.init(hasher, key).finalize(message);
            };
        }
    });
    var C_algo = C.algo = {};
    return C;
}(Math));

(function (Math) {
    var C = CryptoJS;
    var C_lib = C.lib;
    var WordArray = C_lib.WordArray;
    var Hasher = C_lib.Hasher;
    var C_algo = C.algo;
    var T = [];
    (function () {
        for (var i = 0; i < 64; i++) {
            T[i] = (Math.abs(Math.sin(i + 1)) * 0x100000000) | 0;
        }
    }());
    var MD5 = C_algo.MD5 = Hasher.extend({
        _doReset: function () {
            this._hash = new WordArray.init([0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476]);
        }, _doProcessBlock: function (M, offset) {
            for (var i = 0; i < 16; i++) {
                var offset_i = offset + i;
                var M_offset_i = M[offset_i];
                M[offset_i] = ((((M_offset_i << 8) | (M_offset_i >>> 24)) & 0x00ff00ff) | (((M_offset_i << 24) | (M_offset_i >>> 8)) & 0xff00ff00));
            }
            var H = this._hash.words;
            var M_offset_0 = M[offset + 0];
            var M_offset_1 = M[offset + 1];
            var M_offset_2 = M[offset + 2];
            var M_offset_3 = M[offset + 3];
            var M_offset_4 = M[offset + 4];
            var M_offset_5 = M[offset + 5];
            var M_offset_6 = M[offset + 6];
            var M_offset_7 = M[offset + 7];
            var M_offset_8 = M[offset + 8];
            var M_offset_9 = M[offset + 9];
            var M_offset_10 = M[offset + 10];
            var M_offset_11 = M[offset + 11];
            var M_offset_12 = M[offset + 12];
            var M_offset_13 = M[offset + 13];
            var M_offset_14 = M[offset + 14];
            var M_offset_15 = M[offset + 15];
            var a = H[0];
            var b = H[1];
            var c = H[2];
            var d = H[3];
            a = FF(a, b, c, d, M_offset_0, 7, T[0]);
            d = FF(d, a, b, c, M_offset_1, 12, T[1]);
            c = FF(c, d, a, b, M_offset_2, 17, T[2]);
            b = FF(b, c, d, a, M_offset_3, 22, T[3]);
            a = FF(a, b, c, d, M_offset_4, 7, T[4]);
            d = FF(d, a, b, c, M_offset_5, 12, T[5]);
            c = FF(c, d, a, b, M_offset_6, 17, T[6]);
            b = FF(b, c, d, a, M_offset_7, 22, T[7]);
            a = FF(a, b, c, d, M_offset_8, 7, T[8]);
            d = FF(d, a, b, c, M_offset_9, 12, T[9]);
            c = FF(c, d, a, b, M_offset_10, 17, T[10]);
            b = FF(b, c, d, a, M_offset_11, 22, T[11]);
            a = FF(a, b, c, d, M_offset_12, 7, T[12]);
            d = FF(d, a, b, c, M_offset_13, 12, T[13]);
            c = FF(c, d, a, b, M_offset_14, 17, T[14]);
            b = FF(b, c, d, a, M_offset_15, 22, T[15]);
            a = GG(a, b, c, d, M_offset_1, 5, T[16]);
            d = GG(d, a, b, c, M_offset_6, 9, T[17]);
            c = GG(c, d, a, b, M_offset_11, 14, T[18]);
            b = GG(b, c, d, a, M_offset_0, 20, T[19]);
            a = GG(a, b, c, d, M_offset_5, 5, T[20]);
            d = GG(d, a, b, c, M_offset_10, 9, T[21]);
            c = GG(c, d, a, b, M_offset_15, 14, T[22]);
            b = GG(b, c, d, a, M_offset_4, 20, T[23]);
            a = GG(a, b, c, d, M_offset_9, 5, T[24]);
            d = GG(d, a, b, c, M_offset_14, 9, T[25]);
            c = GG(c, d, a, b, M_offset_3, 14, T[26]);
            b = GG(b, c, d, a, M_offset_8, 20, T[27]);
            a = GG(a, b, c, d, M_offset_13, 5, T[28]);
            d = GG(d, a, b, c, M_offset_2, 9, T[29]);
            c = GG(c, d, a, b, M_offset_7, 14, T[30]);
            b = GG(b, c, d, a, M_offset_12, 20, T[31]);
            a = HH(a, b, c, d, M_offset_5, 4, T[32]);
            d = HH(d, a, b, c, M_offset_8, 11, T[33]);
            c = HH(c, d, a, b, M_offset_11, 16, T[34]);
            b = HH(b, c, d, a, M_offset_14, 23, T[35]);
            a = HH(a, b, c, d, M_offset_1, 4, T[36]);
            d = HH(d, a, b, c, M_offset_4, 11, T[37]);
            c = HH(c, d, a, b, M_offset_7, 16, T[38]);
            b = HH(b, c, d, a, M_offset_10, 23, T[39]);
            a = HH(a, b, c, d, M_offset_13, 4, T[40]);
            d = HH(d, a, b, c, M_offset_0, 11, T[41]);
            c = HH(c, d, a, b, M_offset_3, 16, T[42]);
            b = HH(b, c, d, a, M_offset_6, 23, T[43]);
            a = HH(a, b, c, d, M_offset_9, 4, T[44]);
            d = HH(d, a, b, c, M_offset_12, 11, T[45]);
            c = HH(c, d, a, b, M_offset_15, 16, T[46]);
            b = HH(b, c, d, a, M_offset_2, 23, T[47]);
            a = II(a, b, c, d, M_offset_0, 6, T[48]);
            d = II(d, a, b, c, M_offset_7, 10, T[49]);
            c = II(c, d, a, b, M_offset_14, 15, T[50]);
            b = II(b, c, d, a, M_offset_5, 21, T[51]);
            a = II(a, b, c, d, M_offset_12, 6, T[52]);
            d = II(d, a, b, c, M_offset_3, 10, T[53]);
            c = II(c, d, a, b, M_offset_10, 15, T[54]);
            b = II(b, c, d, a, M_offset_1, 21, T[55]);
            a = II(a, b, c, d, M_offset_8, 6, T[56]);
            d = II(d, a, b, c, M_offset_15, 10, T[57]);
            c = II(c, d, a, b, M_offset_6, 15, T[58]);
            b = II(b, c, d, a, M_offset_13, 21, T[59]);
            a = II(a, b, c, d, M_offset_4, 6, T[60]);
            d = II(d, a, b, c, M_offset_11, 10, T[61]);
            c = II(c, d, a, b, M_offset_2, 15, T[62]);
            b = II(b, c, d, a, M_offset_9, 21, T[63]);
            H[0] = (H[0] + a) | 0;
            H[1] = (H[1] + b) | 0;
            H[2] = (H[2] + c) | 0;
            H[3] = (H[3] + d) | 0;
        }, _doFinalize: function () {
            var data = this._data;
            var dataWords = data.words;
            var nBitsTotal = this._nDataBytes * 8;
            var nBitsLeft = data.sigBytes * 8;
            dataWords[nBitsLeft >>> 5] |= 0x80 << (24 - nBitsLeft % 32);
            var nBitsTotalH = Math.floor(nBitsTotal / 0x100000000);
            var nBitsTotalL = nBitsTotal;
            dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 15] = ((((nBitsTotalH << 8) | (nBitsTotalH >>> 24)) & 0x00ff00ff) | (((nBitsTotalH << 24) | (nBitsTotalH >>> 8)) & 0xff00ff00));
            dataWords[(((nBitsLeft + 64) >>> 9) << 4) + 14] = ((((nBitsTotalL << 8) | (nBitsTotalL >>> 24)) & 0x00ff00ff) | (((nBitsTotalL << 24) | (nBitsTotalL >>> 8)) & 0xff00ff00));
            data.sigBytes = (dataWords.length + 1) * 4;
            this._process();
            var hash = this._hash;
            var H = hash.words;
            for (var i = 0; i < 4; i++) {
                var H_i = H[i];
                H[i] = (((H_i << 8) | (H_i >>> 24)) & 0x00ff00ff) | (((H_i << 24) | (H_i >>> 8)) & 0xff00ff00);
            }
            return hash;
        }, clone: function () {
            var clone = Hasher.clone.call(this);
            clone._hash = this._hash.clone();
            return clone;
        }
    });
    function FF(a, b, c, d, x, s, t) {
        var n = a + ((b & c) | (~b & d)) + x + t;
        return ((n << s) | (n >>> (32 - s))) + b;
    }
    function GG(a, b, c, d, x, s, t) {
        var n = a + ((b & d) | (c & ~d)) + x + t;
        return ((n << s) | (n >>> (32 - s))) + b;
    }
    function HH(a, b, c, d, x, s, t) {
        var n = a + (b ^ c ^ d) + x + t;
        return ((n << s) | (n >>> (32 - s))) + b;
    }
    function II(a, b, c, d, x, s, t) {
        var n = a + (c ^ (b | ~d)) + x + t;
        return ((n << s) | (n >>> (32 - s))) + b;
    }
    C.MD5 = Hasher._createHelper(MD5);
    C.HmacMD5 = Hasher._createHmacHelper(MD5);
}(Math));


var data = "spiderapi.cn - 虫术";
var resultLowercase32bit = CryptoJS.MD5(data).toString(CryptoJS.enc.Hex);
var resultUppercase32bit = resultLowercase32bit.toUpperCase();
var resultLowercase16bit = resultLowercase32bit.slice(8, 24);
var resultUppercase16bit = resultLowercase16bit.toUpperCase();

console.log("32 位小写值:", resultLowercase32bit);
console.log("32 位大写值:", resultUppercase32bit);
console.log("16 位小写值:", resultLowercase16bit);
console.log("16 位大写值:", resultUppercase16bit);
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      // 不借助官方或者第三方库，纯源码实现

function md5Hash(instring) {
    var hexcase = 0;   /* hex output format. 0 - lowercase; 1 - uppercase        */
    var b64pad = "";  /* base-64 pad character. "=" for strict RFC compliance   */

    /*
     * These are the functions you'll usually want to call
     * They take string arguments and return either hex or base-64 encoded strings
     */
    function hex_md5(s) {
        return rstr2hex(rstr_md5(str2rstr_utf8(s)));
    }

    function b64_md5(s) {
        return rstr2b64(rstr_md5(str2rstr_utf8(s)));
    }

    function any_md5(s, e) {
        return rstr2any(rstr_md5(str2rstr_utf8(s)), e);
    }

    function hex_hmac_md5(k, d) {
        return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)));
    }

    function b64_hmac_md5(k, d) {
        return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)));
    }

    function any_hmac_md5(k, d, e) {
        return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e);
    }

    /*
     * Calculate the MD5 of a raw string
     */
    function rstr_md5(s) {
        return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
    }

    /*
     * Calculate the HMAC-MD5, of a key and some data (raw strings)
     */
    function rstr_hmac_md5(key, data) {
        var bkey = rstr2binl(key);
        if (bkey.length > 16) bkey = binl_md5(bkey, key.length * 8);

        var ipad = Array(16), opad = Array(16);
        for (var i = 0; i < 16; i++) {
            ipad[i] = bkey[i] ^ 0x36363636;
            opad[i] = bkey[i] ^ 0x5C5C5C5C;
        }

        var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
        return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
    }

    /*
     * Convert a raw string to a hex string
     */
    function rstr2hex(input) {
        try {
            hexcase
        } catch (e) {
            hexcase = 0;
        }
        var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
        var output = "";
        var x;
        for (var i = 0; i < input.length; i++) {
            x = input.charCodeAt(i);
            output += hex_tab.charAt((x >>> 4) & 0x0F)
                + hex_tab.charAt(x & 0x0F);
        }
        return output;
    }

    /*
     * Convert a raw string to a base-64 string
     */
    function rstr2b64(input) {
        try {
            b64pad
        } catch (e) {
            b64pad = '';
        }
        var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
        var output = "";
        var len = input.length;
        for (var i = 0; i < len; i += 3) {
            var triplet = (input.charCodeAt(i) << 16)
                | (i + 1 < len ? input.charCodeAt(i + 1) << 8 : 0)
                | (i + 2 < len ? input.charCodeAt(i + 2) : 0);
            for (var j = 0; j < 4; j++) {
                if (i * 8 + j * 6 > input.length * 8) output += b64pad;
                else output += tab.charAt((triplet >>> 6 * (3 - j)) & 0x3F);
            }
        }
        return output;
    }

    /*
     * Convert a raw string to an arbitrary string encoding
     */
    function rstr2any(input, encoding) {
        var divisor = encoding.length;
        var i, j, q, x, quotient;

        /* Convert to an array of 16-bit big-endian values, forming the dividend */
        var dividend = Array(Math.ceil(input.length / 2));
        for (i = 0; i < dividend.length; i++) {
            dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
        }

        /*
         * Repeatedly perform a long division. The binary array forms the dividend,
         * the length of the encoding is the divisor. Once computed, the quotient
         * forms the dividend for the next step. All remainders are stored for later
         * use.
         */
        var full_length = Math.ceil(input.length * 8 /
            (Math.log(encoding.length) / Math.log(2)));
        var remainders = Array(full_length);
        for (j = 0; j < full_length; j++) {
            quotient = Array();
            x = 0;
            for (i = 0; i < dividend.length; i++) {
                x = (x << 16) + dividend[i];
                q = Math.floor(x / divisor);
                x -= q * divisor;
                if (quotient.length > 0 || q > 0)
                    quotient[quotient.length] = q;
            }
            remainders[j] = x;
            dividend = quotient;
        }

        /* Convert the remainders to the output string */
        var output = "";
        for (i = remainders.length - 1; i >= 0; i--)
            output += encoding.charAt(remainders[i]);

        return output;
    }

    /*
     * Encode a string as utf-8.
     * For efficiency, this assumes the input is valid utf-16.
     */
    function str2rstr_utf8(input) {
        var output = "";
        var i = -1;
        var x, y;

        while (++i < input.length) {
            /* Decode utf-16 surrogate pairs */
            x = input.charCodeAt(i);
            y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
            if (0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF) {
                x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
                i++;
            }

            /* Encode output as utf-8 */
            if (x <= 0x7F)
                output += String.fromCharCode(x);
            else if (x <= 0x7FF)
                output += String.fromCharCode(0xC0 | ((x >>> 6) & 0x1F),
                    0x80 | (x & 0x3F));
            else if (x <= 0xFFFF)
                output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
                    0x80 | ((x >>> 6) & 0x3F),
                    0x80 | (x & 0x3F));
            else if (x <= 0x1FFFFF)
                output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
                    0x80 | ((x >>> 12) & 0x3F),
                    0x80 | ((x >>> 6) & 0x3F),
                    0x80 | (x & 0x3F));
        }
        return output;
    }

    /*
     * Encode a string as utf-16
     */
    function str2rstr_utf16le(input) {
        var output = "";
        for (var i = 0; i < input.length; i++)
            output += String.fromCharCode(input.charCodeAt(i) & 0xFF,
                (input.charCodeAt(i) >>> 8) & 0xFF);
        return output;
    }

    function str2rstr_utf16be(input) {
        var output = "";
        for (var i = 0; i < input.length; i++)
            output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,
                input.charCodeAt(i) & 0xFF);
        return output;
    }

    /*
     * Convert a raw string to an array of little-endian words
     * Characters >255 have their high-byte silently ignored.
     */
    function rstr2binl(input) {
        var output = Array(input.length >> 2);
        for (var i = 0; i < output.length; i++)
            output[i] = 0;
        for (var i = 0; i < input.length * 8; i += 8)
            output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32);
        return output;
    }

    /*
     * Convert an array of little-endian words to a string
     */
    function binl2rstr(input) {
        var output = "";
        for (var i = 0; i < input.length * 32; i += 8)
            output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF);
        return output;
    }

    /*
     * Calculate the MD5 of an array of little-endian words, and a bit length.
     */
    function binl_md5(x, len) {
        /* append padding */
        x[len >> 5] |= 0x80 << ((len) % 32);
        x[(((len + 64) >>> 9) << 4) + 14] = len;

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

        for (var i = 0; i < x.length; i += 16) {
            var olda = a;
            var oldb = b;
            var oldc = c;
            var 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, a, b, x, s, t) {
        return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
    }

    function md5_ff(a, b, c, d, x, s, t) {
        return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
    }

    function md5_gg(a, b, c, d, x, s, t) {
        return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
    }

    function md5_hh(a, b, c, d, x, s, t) {
        return md5_cmn(b ^ c ^ d, a, b, x, s, t);
    }

    function md5_ii(a, b, c, d, x, s, t) {
        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, y) {
        var lsw = (x & 0xFFFF) + (y & 0xFFFF);
        var 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, cnt) {
        return (num << cnt) | (num >>> (32 - cnt));
    }

    return hex_md5(instring);
}

var data = "spiderapi.cn - 虫术";
var resultLowercase32bit = md5Hash(data);
var resultUppercase32bit = resultLowercase32bit.toUpperCase();
var resultLowercase16bit = resultLowercase32bit.slice(8, 24);
var resultUppercase16bit = resultLowercase16bit.toUpperCase();

console.log("32 位小写值:", resultLowercase32bit);
console.log("32 位大写值:", resultUppercase32bit);
console.log("16 位小写值:", resultLowercase16bit);
console.log("16 位大写值:", resultUppercase16bit);
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      // Make sure to add code blocks to your code group

      # Golang 1.0+

        // 方法一：使用 md5.New 创建哈希对象

package main

import (
    "crypto/md5"
    "encoding/hex"
    "fmt"
    "strings"
)

func md5Hash(data string) string {
    hashObject := md5.New()
    hashObject.Write([]byte(data))
    hashBytes := hashObject.Sum(nil)
    hashString := hex.EncodeToString(hashBytes)
    return hashString
}

func main() {
    data := "spiderapi.cn - 虫术"
    resultLowercase32bit := md5Hash(data)
    resultUppercase32bit := strings.ToUpper(resultLowercase32bit)
    resultLowercase16bit := resultLowercase32bit[8:24]
    resultUppercase16bit := strings.ToUpper(resultLowercase16bit)
    fmt.Println("32 位小写值: ", resultLowercase32bit)
    fmt.Println("32 位大写值: ", resultUppercase32bit)
    fmt.Println("16 位小写值: ", resultLowercase16bit)
    fmt.Println("16 位大写值: ", resultUppercase16bit)
}
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        // 方法二：使用 io 包将字符串写入哈希对象

package main

import (
    "crypto/md5"
    "encoding/hex"
    "fmt"
    "io"
    "strings"
)

func md5Hash(data string) string {
    hashObject := md5.New()
    _, err := io.WriteString(hashObject, data)
    if err != nil {
        fmt.Println("md5Hash error:", err)
        return ""
    }
    hashBytes := hashObject.Sum(nil)
    hashString := hex.EncodeToString(hashBytes)
    return hashString
}

func main() {
    data := "spiderapi.cn - 虫术"
    resultLowercase32bit := md5Hash(data)
    resultUppercase32bit := strings.ToUpper(resultLowercase32bit)
    resultLowercase16bit := resultLowercase32bit[8:24]
    resultUppercase16bit := strings.ToUpper(resultLowercase16bit)
    fmt.Println("32 位小写值: ", resultLowercase32bit)
    fmt.Println("32 位大写值: ", resultUppercase32bit)
    fmt.Println("16 位小写值: ", resultLowercase16bit)
    fmt.Println("16 位大写值: ", resultUppercase16bit)
}
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        // 方法三：使用 md5.Sum 函数计算哈希值

package main

import (
    "crypto/md5"
    "encoding/hex"
    "fmt"
    "strings"
)

func md5Hash(data string) string {
    hashBytes := md5.Sum([]byte(data))
    hashString := hex.EncodeToString(hashBytes[:])
    return hashString
}

func main() {
    data := "spiderapi.cn - 虫术"
    resultLowercase32bit := md5Hash(data)
    resultUppercase32bit := strings.ToUpper(resultLowercase32bit)
    resultLowercase16bit := resultLowercase32bit[8:24]
    resultUppercase16bit := strings.ToUpper(resultLowercase16bit)
    fmt.Println("32 位小写值: ", resultLowercase32bit)
    fmt.Println("32 位大写值: ", resultUppercase32bit)
    fmt.Println("16 位小写值: ", resultLowercase16bit)
    fmt.Println("16 位大写值: ", resultUppercase16bit)
}
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        // 不借助官方或者第三方库，纯源码实现

package main

import (
    "bytes"
    "encoding/binary"
    "fmt"
    "math"
    "strings"
)

var shift = [...]uint{7, 12, 17, 22, 5, 9, 14, 20, 4, 11, 16, 23, 6, 10, 15, 21}
var table [64]uint32

func init() {
    for i := range table {
        table[i] = uint32((1 << 32) * math.Abs(math.Sin(float64(i+1))))
    }
}

func md5Hash(s string) string {
    padded := bytes.NewBuffer([]byte(s))
    padded.WriteByte(0x80)
    for padded.Len()%64 != 56 {
        padded.WriteByte(0)
    }
    messageLenBits := uint64(len(s)) * 8
    err := binary.Write(padded, binary.LittleEndian, messageLenBits)
    if err != nil {
        return ""
    }
  
    var a, b, c, d uint32 = 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476
    var buffer [16]uint32
    for binary.Read(padded, binary.LittleEndian, buffer[:]) == nil { // read every 64 bytes
        a1, b1, c1, d1 := a, b, c, d
        for j := 0; j < 64; j++ {
            var f uint32
            bufferIndex := j
            round := j >> 4
            switch round {
            case 0:
                f = (b1 & c1) | (^b1 & d1)
            case 1:
                f = (b1 & d1) | (c1 & ^d1)
                bufferIndex = (bufferIndex*5 + 1) & 0x0F
            case 2:
                f = b1 ^ c1 ^ d1
                bufferIndex = (bufferIndex*3 + 5) & 0x0F
            case 3:
                f = c1 ^ (b1 | ^d1)
                bufferIndex = (bufferIndex * 7) & 0x0F
            }
            sa := shift[(round<<2)|(j&3)]
            a1 += f + buffer[bufferIndex] + table[j]
            a1, d1, c1, b1 = d1, c1, b1, a1<<sa|a1>>(32-sa)+b1
        }
        a, b, c, d = a+a1, b+b1, c+c1, d+d1
    }
  
    var result [16]byte
    binary.LittleEndian.PutUint32(result[0:4], a)
    binary.LittleEndian.PutUint32(result[4:8], b)
    binary.LittleEndian.PutUint32(result[8:12], c)
    binary.LittleEndian.PutUint32(result[12:16], d)
    return fmt.Sprintf("%x", result)
}

func main() {
    data := "spiderapi.cn - 虫术"
    resultLowercase32bit := md5Hash(data)
    resultUppercase32bit := strings.ToUpper(resultLowercase32bit)
    resultLowercase16bit := resultLowercase32bit[8:24]
    resultUppercase16bit := strings.ToUpper(resultLowercase16bit)
    fmt.Println("32 位小写值: ", resultLowercase32bit)
    fmt.Println("32 位大写值: ", resultUppercase32bit)
    fmt.Println("16 位小写值: ", resultLowercase16bit)
    fmt.Println("16 位大写值: ", resultUppercase16bit)
}
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        // Make sure to add code blocks to your code group

        # 主要特征

        MD5 的 hash 值具有明显的特征，实现该算法的源代码里也有一些固定的特征值，没有这些特定值，就无法实现 MD5，我们可以通过密文特征和搜索源码特征值来快速判断是否为 MD5 算法。

        密文特征：

        • 密文一般为 16 位或者 32 位，其中 16 位是取的 32 位第 9~25 位的值；
        • 组成方式为字母（a-f）和数字（0-9）混合，字母可以全部是大写或者小写。

        源码特征值：

        • 0123456789ABCDEF、0123456789abcdef
        • 1732584193、-271733879、-1732584194、271733878
        • 0x67452301、0xefcdab89、0x98badcfe、0x10325476

        PS：某些特殊情况下，密文的长度也有可能不止 16 位或者 32 位，有可能是在官方算法上有一些魔改，通常也是在 16 位的基础上，左右填充了一些随机字符串。

        示例：

        编码类型 示例一 示例二
        明文 01234567890 administrators
        32 位小写 ebe596017db2f8c69136e5d6e594d365 d04952b3df94d47c04fc2dc28396a62d
        32 位大写 EBE596017DB2F8C69136E5D6E594D365 D04952B3DF94D47C04FC2DC28396A62D
        16 位小写 7db2f8c69136e5d6 df94d47c04fc2dc2
        16 位大写 7DB2F8C69136E5D6 DF94D47C04FC2DC2

        # 在线工具

        https://www.sojson.com/encrypt_md5.html (opens new window)

        帮助我们改善此页 (opens new window)
        上次更新: 2025/04/22, 14:38:07
        Base64
        HMAC

        ← HMAC→

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