逆向03-比价器01 -获取 jCryptionValue

比价器

1. 输入用户名和密码 点击登录
2. 找到登录所对应的url 看到参数是加密的

3. 根据key找对应的加密函数-打断点再刷新
   

能看到data 和key0 的 值

接下来去找encrypt函数

再继续去找encrypt函数--悬浮-点进去

再接下来我们就是扣代码了

var Aes = {};
Aes.sBox = [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16];
Aes.rCon = [[0x00, 0x00, 0x00, 0x00], [0x01, 0x00, 0x00, 0x00], [0x02, 0x00, 0x00, 0x00], [0x04, 0x00, 0x00, 0x00], [0x08, 0x00, 0x00, 0x00], [0x10, 0x00, 0x00, 0x00], [0x20, 0x00, 0x00, 0x00], [0x40, 0x00, 0x00, 0x00], [0x80, 0x00, 0x00, 0x00], [0x1b, 0x00, 0x00, 0x00], [0x36, 0x00, 0x00, 0x00]];
Aes.Ctr = {};
Aes.cipher = function(input, w) {
    var Nb = 4;
    var Nr = w.length / Nb - 1;
    var state = [[], [], [], []];
    for (var i = 0; i < 4 * Nb; i++)
        state[i % 4][Math.floor(i / 4)] = input[i];
    state = Aes.addRoundKey(state, w, 0, Nb);
    for (var round = 1; round < Nr; round++) {
        state = Aes.subBytes(state, Nb);
        state = Aes.shiftRows(state, Nb);
        state = Aes.mixColumns(state, Nb);
        state = Aes.addRoundKey(state, w, round, Nb);
    }
    state = Aes.subBytes(state, Nb);
    state = Aes.shiftRows(state, Nb);
    state = Aes.addRoundKey(state, w, Nr, Nb);
    var output = new Array(4 * Nb);
    for (var i = 0; i < 4 * Nb; i++)
        output[i] = state[i % 4][Math.floor(i / 4)];
    return output;
}
Aes.subBytes = function(s, Nb) {
    for (var r = 0; r < 4; r++) {
        for (var c = 0; c < Nb; c++)
            s[r][c] = Aes.sBox[s[r][c]];
    }
    return s;
}
Aes.shiftRows = function(s, Nb) {
    var t = new Array(4);
    for (var r = 1; r < 4; r++) {
        for (var c = 0; c < 4; c++)
            t[c] = s[r][(c + r) % Nb];
        for (var c = 0; c < 4; c++)
            s[r][c] = t[c];
    }
    return s;
}
Aes.rotWord = function(w) {
    var tmp = w[0];
    for (var i = 0; i < 3; i++)
        w[i] = w[i + 1];
    w[3] = tmp;
    return w;
}
Aes.mixColumns = function(s, Nb) {
    for (var c = 0; c < 4; c++) {
        var a = new Array(4);
        var b = new Array(4);
        for (var i = 0; i < 4; i++) {
            a[i] = s[i][c];
            b[i] = s[i][c] & 0x80 ? s[i][c] << 1 ^ 0x011b : s[i][c] << 1;
        }
        s[0][c] = b[0] ^ a[1] ^ b[1] ^ a[2] ^ a[3];
        s[1][c] = a[0] ^ b[1] ^ a[2] ^ b[2] ^ a[3];
        s[2][c] = a[0] ^ a[1] ^ b[2] ^ a[3] ^ b[3];
        s[3][c] = a[0] ^ b[0] ^ a[1] ^ a[2] ^ b[3];
    }
    return s;
}
Aes.addRoundKey = function(state, w, rnd, Nb) {
    for (var r = 0; r < 4; r++) {
        for (var c = 0; c < Nb; c++)
            state[r][c] ^= w[rnd * 4 + c][r];
    }
    return state;
}
Aes.subWord = function(w) {
    for (var i = 0; i < 4; i++)
        w[i] = Aes.sBox[w[i]];
    return w;
}
Aes.keyExpansion = function(key) {
    var Nb = 4;
    var Nk = key.length / 4
    var Nr = Nk + 6;
    var w = new Array(Nb * (Nr + 1));
    var temp = new Array(4);
    for (var i = 0; i < Nk; i++) {
        var r = [key[4 * i], key[4 * i + 1], key[4 * i + 2], key[4 * i + 3]];
        w[i] = r;
    }
    for (var i = Nk; i < (Nb * (Nr + 1)); i++) {
        w[i] = new Array(4);
        for (var t = 0; t < 4; t++)
            temp[t] = w[i - 1][t];
        if (i % Nk == 0) {
            temp = Aes.subWord(Aes.rotWord(temp));
            for (var t = 0; t < 4; t++)
                temp[t] ^= Aes.rCon[i / Nk][t];
        } else if (Nk > 6 && i % Nk == 4) {
            temp = Aes.subWord(temp);
        }
        for (var t = 0; t < 4; t++)
            w[i][t] = w[i - Nk][t] ^ temp[t];
    }
    return w;
}
Aes.Ctr.encrypt = function(plaintext, password, nBits) {
    var blockSize = 16;
    if (!(nBits == 128 || nBits == 192 || nBits == 256))
        return '';
    plaintext = Utf8.encode(plaintext);
    password = Utf8.encode(password);
    var nBytes = nBits / 8;
    var pwBytes = new Array(nBytes);
    for (var i = 0; i < nBytes; i++) {
        pwBytes[i] = isNaN(password.charCodeAt(i)) ? 0 : password.charCodeAt(i);
    }
    var key = Aes.cipher(pwBytes, Aes.keyExpansion(pwBytes));
    key = key.concat(key.slice(0, nBytes - 16));
    var counterBlock = new Array(blockSize);
    var nonce = (new Date()).getTime();
    var nonceMs = nonce % 1000;
    var nonceSec = Math.floor(nonce / 1000);
    var nonceRnd = Math.floor(Math.random() * 0xffff);
    for (var i = 0; i < 2; i++)
        counterBlock[i] = (nonceMs >>> i * 8) & 0xff;
    for (var i = 0; i < 2; i++)
        counterBlock[i + 2] = (nonceRnd >>> i * 8) & 0xff;
    for (var i = 0; i < 4; i++)
        counterBlock[i + 4] = (nonceSec >>> i * 8) & 0xff;
    var ctrTxt = '';
    for (var i = 0; i < 8; i++)
        ctrTxt += String.fromCharCode(counterBlock[i]);
    var keySchedule = Aes.keyExpansion(key);
    var blockCount = Math.ceil(plaintext.length / blockSize);
    var ciphertxt = new Array(blockCount);
    for (var b = 0; b < blockCount; b++) {
        for (var c = 0; c < 4; c++)
            counterBlock[15 - c] = (b >>> c * 8) & 0xff;
        for (var c = 0; c < 4; c++)
            counterBlock[15 - c - 4] = (b / 0x100000000 >>> c * 8)
        var cipherCntr = Aes.cipher(counterBlock, keySchedule);
        var blockLength = b < blockCount - 1 ? blockSize : (plaintext.length - 1) % blockSize + 1;
        var cipherChar = new Array(blockLength);
        for (var i = 0; i < blockLength; i++) {
            cipherChar[i] = cipherCntr[i] ^ plaintext.charCodeAt(b * blockSize + i);
            cipherChar[i] = String.fromCharCode(cipherChar[i]);
        }
        ciphertxt[b] = cipherChar.join('');
    }
    var ciphertext = ctrTxt + ciphertxt.join('');
    ciphertext = Base64.encode(ciphertext);
    return ciphertext;
}
Aes.Ctr.decrypt = function(ciphertext, password, nBits) {
    var blockSize = 16;
    if (!(nBits == 128 || nBits == 192 || nBits == 256))
        return '';
    ciphertext = Base64.decode(ciphertext);
    password = Utf8.encode(password);
    var nBytes = nBits / 8;
    var pwBytes = new Array(nBytes);
    for (var i = 0; i < nBytes; i++) {
        pwBytes[i] = isNaN(password.charCodeAt(i)) ? 0 : password.charCodeAt(i);
    }
    var key = Aes.cipher(pwBytes, Aes.keyExpansion(pwBytes));
    key = key.concat(key.slice(0, nBytes - 16));
    var counterBlock = new Array(8);
    ctrTxt = ciphertext.slice(0, 8);
    for (var i = 0; i < 8; i++)
        counterBlock[i] = ctrTxt.charCodeAt(i);
    var keySchedule = Aes.keyExpansion(key);
    var nBlocks = Math.ceil((ciphertext.length - 8) / blockSize);
    var ct = new Array(nBlocks);
    for (var b = 0; b < nBlocks; b++)
        ct[b] = ciphertext.slice(8 + b * blockSize, 8 + b * blockSize + blockSize);
    ciphertext = ct;
    var plaintxt = new Array(ciphertext.length);
    for (var b = 0; b < nBlocks; b++) {
        for (var c = 0; c < 4; c++)
            counterBlock[15 - c] = ((b) >>> c * 8) & 0xff;
        for (var c = 0; c < 4; c++)
            counterBlock[15 - c - 4] = (((b + 1) / 0x100000000 - 1) >>> c * 8) & 0xff;
        var cipherCntr = Aes.cipher(counterBlock, keySchedule);
        var plaintxtByte = new Array(ciphertext[b].length);
        for (var i = 0; i < ciphertext[b].length; i++) {
            plaintxtByte[i] = cipherCntr[i] ^ ciphertext[b].charCodeAt(i);
            plaintxtByte[i] = String.fromCharCode(plaintxtByte[i]);
        }
        plaintxt[b] = plaintxtByte.join('');
    }
    var plaintext = plaintxt.join('');
    plaintext = Utf8.decode(plaintext);
    return plaintext;
}
var Base64 = {};
Base64.code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
Base64.encode = function(str, utf8encode) {
    utf8encode = (typeof utf8encode == 'undefined') ? false : utf8encode;
    var o1, o2, o3, bits, h1, h2, h3, h4, e = [], pad = '', c, plain, coded;
    var b64 = Base64.code;
    plain = utf8encode ? str.encodeUTF8() : str;
    c = plain.length % 3;
    if (c > 0) {
        while (c++ < 3) {
            pad += '=';
            plain += '\0';
        }
    }
    for (c = 0; c < plain.length; c += 3) {
        o1 = plain.charCodeAt(c);
        o2 = plain.charCodeAt(c + 1);
        o3 = plain.charCodeAt(c + 2);
        bits = o1 << 16 | o2 << 8 | o3;
        h1 = bits >> 18 & 0x3f;
        h2 = bits >> 12 & 0x3f;
        h3 = bits >> 6 & 0x3f;
        h4 = bits & 0x3f;
        e[c / 3] = b64.charAt(h1) + b64.charAt(h2) + b64.charAt(h3) + b64.charAt(h4);
    }
    coded = e.join('');
    coded = coded.slice(0, coded.length - pad.length) + pad;
    return coded;
}
Base64.decode = function(str, utf8decode) {
    utf8decode = (typeof utf8decode == 'undefined') ? false : utf8decode;
    var o1, o2, o3, h1, h2, h3, h4, bits, d = [], plain, coded;
    var b64 = Base64.code;
    coded = utf8decode ? str.decodeUTF8() : str;
    for (var c = 0; c < coded.length; c += 4) {
        h1 = b64.indexOf(coded.charAt(c));
        h2 = b64.indexOf(coded.charAt(c + 1));
        h3 = b64.indexOf(coded.charAt(c + 2));
        h4 = b64.indexOf(coded.charAt(c + 3));
        bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
        o1 = bits >>> 16 & 0xff;
        o2 = bits >>> 8 & 0xff;
        o3 = bits & 0xff;
        d[c / 4] = String.fromCharCode(o1, o2, o3);
        if (h4 == 0x40)
            d[c / 4] = String.fromCharCode(o1, o2);
        if (h3 == 0x40)
            d[c / 4] = String.fromCharCode(o1);
    }
    plain = d.join('');
    return utf8decode ? plain.decodeUTF8() : plain;
}
var Utf8 = {};
Utf8.encode = function(strUni) {
    var strUtf = strUni.replace(/[\u0080-\u07ff]/g, function(c) {
        var cc = c.charCodeAt(0);
        return String.fromCharCode(0xc0 | cc >> 6, 0x80 | cc & 0x3f);
    });
    strUtf = strUtf.replace(/[\u0800-\uffff]/g, function(c) {
        var cc = c.charCodeAt(0);
        return String.fromCharCode(0xe0 | cc >> 12, 0x80 | cc >> 6 & 0x3F, 0x80 | cc & 0x3f);
    });
    return strUtf;
}
Utf8.decode = function(strUtf) {
    var strUni = strUtf.replace(/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, function(c) {
        var cc = ((c.charCodeAt(0) & 0x0f) << 12) | ((c.charCodeAt(1) & 0x3f) << 6) | (c.charCodeAt(2) & 0x3f);
        return String.fromCharCode(cc);
    });
    strUni = strUni.replace(/[\u00c0-\u00df][\u0080-\u00bf]/g, function(c) {
        var cc = (c.charCodeAt(0) & 0x1f) << 6 | c.charCodeAt(1) & 0x3f;
        return String.fromCharCode(cc);
    });
    return strUni;
}


let key = "edfbad464ef8fa437f51eb83a4c6450fdb8ec313d31b8501ec58d7cfc1881a98fdf905dd2ea95bc75f9f56cc10e363f42c33189a7d35cbd4ccc6486b4d8bca71"

console.log(Aes.Ctr.encrypt("username=admin&password=123&repassword=",key, 256))
// sAFaf8N3m2b4z0O1A6gEnA4/k3KbzJp3kiT/+3vAkKuU2N7pNzUkGGfMv7Bvko0=

有一个问题：目前我们运行这个值是一直在变化的
变化的原因一般情况下是有两个：
1 时间戳
2 随机数

接下来我们测试一下

// 重写时间戳和随机数
Math.random = function(){
    return 0.1
}

Date.prototype.getTime = function(){
    return 1721465444038 // new Date().getTime()
}

这样的话 我们需要在前端也操作一下【一定要注意是在当前窗口】

前端与后端比对