Asar is a simple extensive archive format, it works like tar that concatenates all files together without compression, while having random access support.
某下载软件前端也是用的electron开发，但是是加密的。直接上代码:
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1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 | 'use strict';(function () { const asar = process._linkedBinding('atom_common_asar') const v8Util = process._linkedBinding('atom_common_v8_util') const { Buffer } = require('buffer') const Module = require('module') const path = require('path') const util = require('util') //################################### const crypto = require('crypto') //################################### const Promise = global.Promise const envNoAsar = process.env.ELECTRON_NO_ASAR && process.type !== 'browser' && process.type !== 'renderer' const isAsarDisabled = () => process.noAsar || envNoAsar const internalBinding = process.internalBinding delete process.internalBinding /** * @param {!Function} functionToCall * @param {!Array|undefined} args */ const nextTick = (functionToCall, args = []) => { process.nextTick(() => functionToCall(...args)) } // Cache asar archive objects. const cachedArchives = new Map() const cachedArchiveKeys = {} const isPrime = (n) => { if (n < 2) return false if (n == 2) return true if (n % 2 == 0) return false let foo = n / 2 for (let i = 3; i <= foo; i += 2) if (n % i == 0) return false return true } // decrypt header infomation const decryptHeader = (data) => { let pubKey = '' pubKey += [ '-', '-', '-', '-', '-', 'B', 'E', 'G', 'I', 'N', ' ', 'P', 'U', 'B', 'L', 'I', 'C', ' ', 'K', 'E', 'Y', '-', '-', '-', '-', '-', ].join('') + '\r\n' let num = 31 let keylist = [] for (let i = 0; i < 16; num++) { if (isPrime(num)) { keylist.push(num) i++ } } let key = Buffer.from(keylist) let list = [ 110, 170, 13, 242, 151, 96, 97, 176, 68, 151, 34, 31, 98, 40, 95, 251, 176, 35, 121, 231, 91, 99, 152, 196, 95, 67, 111, 216, 41, 35, 219, 26, 237, 60, 239, 178, 61, 243, 248, 190, 166, 169, 22, 171, 45, 3, 96, 7, 73, 211, 152, 91, 2, 213, 65, 161, 84, 233, 248, 94, 248, 184, 178, 202, 18, 234, 38, 140, 32, 100, 226, 56, 201, 152, 103, 187, 223, 213, 9, 196, 222, 254, 108, 77, 50, 235, 19, 219, 188, 246, 28, 231, 175, 179, 151, 159, 123, 13, 243, 206, 171, 84, 170, 125, 138, 88, 246, 156, 131, 246, 197, 236, 78, 163, 89, 104, 17, 28, 106, 18, 64, 193, 33, 227, 90, 177, 110, 19, 27, 37, 241, 170, 234, 1, 158, 5, 182, 136, 86, 179, 8, 106, 194, 120, 33, 46, 152, 172, 76, 12, 137, 78, 149, 234, 90, 175, 163, 116, 151, 79, 246, 115, 39, 123, 207, 185, 51, 172, 103, 128, 67, 125, 127, 166, 177, 150, 33, 144, 147, 27, 78, 53, 0, 103, 140, 102, 73, 207, 72, 121, 237, 117, 52, 5, 254, 217, 131, 77, 178, 67, 141, 37, 98, 141, 83, 236, 169, 7, 208, 214, 218, 222, 227, 197, 227, 193, 117, 65, 242, 156, 172, 21, 191, 29, 236, 218, 75, 43, 23, 56, 54, 40, 25, 0, 184, 183, 213, 173, 97, 115, 242, 72, 18, 53, 252, 8, 113, 100, 17, 142, 20, 214, 176, 162, 249, 182, 232, 154, 32, 224, 62, 217, 44, 170, 179, 127, 89, 114, 179, 106, 120, 79, 22, 65, 67, 198, 164, 3, 111, 206, 172, 150, 213, 150, 254, 135, 140, 168, 115, 235, 187, 133, 209, 130, 198, 73, 148, 118, 68, 81, 190, 166, 102, 178, 231, 177, 63, 177, 44, 35, 164, 182, 226, 222, 199, 42, 15, 153, 164, 190, 90, 19, 18, 3, 241, 12, 57, 121, 33, 82, 253, 178, 184, 197, 125, 212, 232, 188, 114, 139, 136, 25, 71, 196, 129, 148, 163, 56, 184, 133, 30, 83, 99, 58, 160, 62, 81, 50, 175, 199, 203, 243, 99, 7, 218, 156, 219, 228, 33, 69, 45, 133, 124, 160, 228, 89, 252, 68, 91, 178, 4, 28, 208, 15, ] for (let i = 0; i < 6; i++) { var cipherChunks = [] var decipher = crypto.createDecipheriv( 'aes-128-ecb', key, Buffer.from([]) ) decipher.setAutoPadding(false) cipherChunks.push( decipher.update(Buffer.from(list.slice(i * 64, (i + 1) * 64))) ) cipherChunks.push(decipher.final()) let res = Buffer.concat(cipherChunks) pubKey += res.toString() + '\r\n' } pubKey += ['q', 'Q', 'I', 'D', 'A', 'Q', 'A', 'B'].join('') + '\r\n' pubKey += [ '-', '-', '-', '-', '-', 'E', 'N', 'D', ' ', 'P', 'U', 'B', 'L', 'I', 'C', ' ', 'K', 'E', 'Y', '-', '-', '-', '-', '-', ].join('') + '\r\n' let dec_by_pub = crypto.publicDecrypt(pubKey, data) return dec_by_pub } const getOrCreateArchive = (archivePath) => { const isCached = cachedArchives.has(archivePath) if (isCached) { return cachedArchives.get(archivePath) } const newArchive = asar.createArchive(archivePath) if (!newArchive) return null cachedArchives.set(archivePath, newArchive) return newArchive } const CAPACITY_READ_ONLY = 9007199254740992 // Largest JS number. // sizeof(T). const SIZE_UINT32 = 4 const SIZE_INT32 = 4 // Aligns 'i' by rounding it up to the next multiple of 'alignment'. const alignInt = function (i, alignment) { return i + ((alignment - (i % alignment)) % alignment) } const PickleIterator = (function () { function PickleIterator(pickle) { this.payload = pickle.header this.payloadOffset = pickle.headerSize this.readIndex = 0 this.endIndex = pickle.getPayloadSize() } PickleIterator.prototype.readUInt32 = function () { return this.readBytes(SIZE_UINT32, Buffer.prototype.readUInt32LE) } PickleIterator.prototype.readInt = function () { return this.readBytes(SIZE_INT32, Buffer.prototype.readInt32LE) } PickleIterator.prototype.readString = function () { return this.readBytes(this.readInt()).toString() } PickleIterator.prototype.readBytes = function (length, method) { var readPayloadOffset = this.getReadPayloadOffsetAndAdvance(length) if (method != null) { return method.call(this.payload, readPayloadOffset, length) } else { return this.payload.slice(readPayloadOffset, readPayloadOffset + length) } } PickleIterator.prototype.getReadPayloadOffsetAndAdvance = function ( length ) { if (length > this.endIndex - this.readIndex) { this.readIndex = this.endIndex throw new Error('Failed to read data with length of ' + length) } var readPayloadOffset = this.payloadOffset + this.readIndex this.advance(length) return readPayloadOffset } PickleIterator.prototype.advance = function (size) { var alignedSize = alignInt(size, SIZE_UINT32) if (this.endIndex - this.readIndex < alignedSize) { this.readIndex = this.endIndex } else { this.readIndex += alignedSize } } return PickleIterator })() // implement a tiny pickle for chromium-pickle-js to read asar header const tinyPickle = (function () { function tinyPickle(buffer) { this.header = buffer this.headerSize = buffer.length - this.getPayloadSize() this.capacityAfterHeader = CAPACITY_READ_ONLY this.writeOffset = 0 if (this.headerSize > buffer.length) { this.headerSize = 0 } if (this.headerSize !== alignInt(this.headerSize, SIZE_UINT32)) { this.headerSize = 0 } if (this.headerSize === 0) { this.header = Buffer.alloc(0) } } tinyPickle.prototype.getPayloadSize = function () { return this.header.readUInt32LE(0) } tinyPickle.prototype.createIterator = function () { return new PickleIterator(this) } return tinyPickle })() const getOrReadArchiveHeader = (archivePath, fs) => { if (cachedArchiveKeys[archivePath] !== undefined) { return cachedArchiveKeys[archivePath] } // if (!archivePath.includes('default_app.asar')) { const fd = cachedArchives.get(archivePath).getFd() let buffer = Buffer.alloc(8) // for default header size // prama: handle, buffer, ?, size, offset fs.readSync(fd, buffer, 0, 8, 0) const sizePickle = new tinyPickle(buffer) let nRsaCipherLength = sizePickle.createIterator().readUInt32() // console.log('### nRsaCipherLength:', nRsaCipherLength); buffer = Buffer.alloc(nRsaCipherLength) fs.readSync(fd, buffer, 0, nRsaCipherLength, 8) // UINT32|string|string // const rsaHeaderPickle = new tinyPickle(buffer); // const rsa_encrypted_str = rsaHeaderPickle.createIterator().readString(); // let headerStr = Buffer.toString(); // read header str let rsaPlaintext = decryptHeader(buffer) // console.log('### rsaPlaintext length:', rsaPlaintext.length); let headerPicklePickle = new tinyPickle(rsaPlaintext).createIterator() let nAesCipherLength = headerPicklePickle.readUInt32() let headermd5 = headerPicklePickle.readString() // decrypt header let aeskey = headerPicklePickle.readString() // console.log('### rsaPlaintext, nAesCipherLength: ', nAesCipherLength, ' md5:', headermd5, ' aeskey:', aeskey); let data = Buffer.alloc(nAesCipherLength) fs.readSync(fd, data, 0, nAesCipherLength, 8 + nRsaCipherLength) var cipherChunks = [] var decipher = crypto.createDecipheriv( 'aes-128-ecb', aeskey, Buffer.from([]) ) decipher.setAutoPadding(false) cipherChunks.push(decipher.update(data, undefined, 'utf8')) cipherChunks.push(decipher.final('utf8')) let header = JSON.parse(cipherChunks.join('')) // verify header md5 let filesStr = JSON.stringify(header.files) // console.log('### aes decrypted: ', filesStr); const hash = crypto.createHash('md5') hash.update(data) let filesMd5 = hash.digest('hex') if (headermd5 !== filesMd5) { // console.warn('### headermd5: ', headermd5, ' filesmd5: ', filesMd5); throw createError(AsarError.INVALID_ARCHIVE, { archivePath, archivePath }) } cachedArchiveKeys[archivePath] = aeskey return aeskey // } // return ''; } // Separate asar package's path from full path. const splitPath = (archivePathOrBuffer) => { // Shortcut for disabled asar. if (isAsarDisabled()) return { isAsar: false } // Check for a bad argument type. let archivePath = archivePathOrBuffer if (Buffer.isBuffer(archivePathOrBuffer)) { archivePath = archivePathOrBuffer.toString() } if (typeof archivePath !== 'string') return { isAsar: false } return asar.splitPath(path.normalize(archivePath)) } // Convert asar archive's Stats object to fs's Stats object. let nextInode = 0 const uid = process.getuid != null ? process.getuid() : 0 const gid = process.getgid != null ? process.getgid() : 0 const fakeTime = new Date() const msec = (date) => (date || fakeTime).getTime() const asarStatsToFsStats = function (stats) { const { Stats, constants } = require('fs') let mode = constants.S_IROTH ^ constants.S_IRGRP ^ constants.S_IRUSR ^ constants.S_IWUSR if (stats.isFile) { mode ^= constants.S_IFREG } else if (stats.isDirectory) { mode ^= constants.S_IFDIR } else if (stats.isLink) { mode ^= constants.S_IFLNK } return new Stats( 1, // dev mode, // mode 1, // nlink uid, gid, 0, // rdev undefined, // blksize ++nextInode, // ino stats.size, undefined, // blocks, msec(stats.atime), // atim_msec msec(stats.mtime), // mtim_msec msec(stats.ctime), // ctim_msec msec(stats.birthtime) // birthtim_msec ) } const AsarError = { NOT_FOUND: 'NOT_FOUND', NOT_DIR: 'NOT_DIR', NO_ACCESS: 'NO_ACCESS', INVALID_ARCHIVE: 'INVALID_ARCHIVE', } const createError = (errorType, { asarPath, filePath } = {}) => { let error switch (errorType) { case AsarError.NOT_FOUND: error = new Error(`ENOENT, ${filePath} not found in ${asarPath}`) error.code = 'ENOENT' error.errno = -2 break case AsarError.NOT_DIR: error = new Error('ENOTDIR, not a directory') error.code = 'ENOTDIR' error.errno = -20 break case AsarError.NO_ACCESS: error = new Error(`EACCES: permission denied, access '${filePath}'`) error.code = 'EACCES' error.errno = -13 break case AsarError.INVALID_ARCHIVE: error = new Error(`Invalid package ${asarPath}`) break default: throw new Error( `Invalid error type "${errorType}" passed to createError.` ) } return error } const overrideAPISync = function ( module, name, pathArgumentIndex, fromAsync ) { if (pathArgumentIndex == null) pathArgumentIndex = 0 const old = module[name] const func = function () { const pathArgument = arguments[pathArgumentIndex] const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return old.apply(this, arguments) const archive = getOrCreateArchive(asarPath) if (!archive) throw createError(AsarError.INVALID_ARCHIVE, { asarPath }) const newPath = archive.copyFileOut(filePath) if (!newPath) throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) arguments[pathArgumentIndex] = newPath return old.apply(this, arguments) } if (fromAsync) { return func } module[name] = func } const overrideAPI = function (module, name, pathArgumentIndex) { if (pathArgumentIndex == null) pathArgumentIndex = 0 const old = module[name] module[name] = function () { const pathArgument = arguments[pathArgumentIndex] const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return old.apply(this, arguments) const callback = arguments[arguments.length - 1] if (typeof callback !== 'function') { return overrideAPISync(module, name, pathArgumentIndex, true).apply( this, arguments ) } const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) nextTick(callback, [error]) return } const newPath = archive.copyFileOut(filePath) if (!newPath) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } arguments[pathArgumentIndex] = newPath return old.apply(this, arguments) } if (old[util.promisify.custom]) { module[name][util.promisify.custom] = makePromiseFunction( old[util.promisify.custom], pathArgumentIndex ) } if (module.promises && module.promises[name]) { module.promises[name] = makePromiseFunction( module.promises[name], pathArgumentIndex ) } } const makePromiseFunction = function (orig, pathArgumentIndex) { return function (...args) { const pathArgument = args[pathArgumentIndex] const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return orig.apply(this, args) const archive = getOrCreateArchive(asarPath) if (!archive) { return Promise.reject( createError(AsarError.INVALID_ARCHIVE, { asarPath }) ) } const newPath = archive.copyFileOut(filePath) if (!newPath) { return Promise.reject( createError(AsarError.NOT_FOUND, { asarPath, filePath }) ) } args[pathArgumentIndex] = newPath return orig.apply(this, args) } } // Override fs APIs. exports.wrapFsWithAsar = (fs) => { const logFDs = {} const logASARAccess = (asarPath, filePath, offset) => { if (!process.env.ELECTRON_LOG_ASAR_READS) return if (!logFDs[asarPath]) { const path = require('path') const logFilename = `${path.basename(asarPath, '.asar')}-access-log.txt` const logPath = path.join(require('os').tmpdir(), logFilename) logFDs[asarPath] = fs.openSync(logPath, 'a') } fs.writeSync(logFDs[asarPath], `${offset}: ${filePath}\n`) } const { lstatSync } = fs fs.lstatSync = (pathArgument, options) => { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return lstatSync(pathArgument, options) const archive = getOrCreateArchive(asarPath) if (!archive) throw createError(AsarError.INVALID_ARCHIVE, { asarPath }) const stats = archive.stat(filePath) if (!stats) throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) return asarStatsToFsStats(stats) } const { lstat } = fs fs.lstat = function (pathArgument, options, callback) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (typeof options === 'function') { callback = options options = {} } if (!isAsar) return lstat(pathArgument, options, callback) const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) nextTick(callback, [error]) return } const stats = archive.stat(filePath) if (!stats) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } const fsStats = asarStatsToFsStats(stats) nextTick(callback, [null, fsStats]) } fs.promises.lstat = util.promisify(fs.lstat) const { statSync } = fs fs.statSync = (pathArgument, options) => { const { isAsar } = splitPath(pathArgument) if (!isAsar) return statSync(pathArgument, options) // Do not distinguish links for now. return fs.lstatSync(pathArgument, options) } const { stat } = fs fs.stat = (pathArgument, options, callback) => { const { isAsar } = splitPath(pathArgument) if (typeof options === 'function') { callback = options options = {} } if (!isAsar) return stat(pathArgument, options, callback) // Do not distinguish links for now. process.nextTick(() => fs.lstat(pathArgument, options, callback)) } fs.promises.stat = util.promisify(fs.stat) const wrapRealpathSync = function (realpathSync) { return function (pathArgument, options) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return realpathSync.apply(this, arguments) const archive = getOrCreateArchive(asarPath) if (!archive) { throw createError(AsarError.INVALID_ARCHIVE, { asarPath }) } const fileRealPath = archive.realpath(filePath) if (fileRealPath === false) { throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) } return path.join(realpathSync(asarPath, options), fileRealPath) } } const { realpathSync } = fs fs.realpathSync = wrapRealpathSync(realpathSync) fs.realpathSync.native = wrapRealpathSync(realpathSync.native) const wrapRealpath = function (realpath) { return function (pathArgument, options, callback) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return realpath.apply(this, arguments) if (arguments.length < 3) { callback = options options = {} } const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) nextTick(callback, [error]) return } const fileRealPath = archive.realpath(filePath) if (fileRealPath === false) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } realpath(asarPath, options, (error, archiveRealPath) => { if (error === null) { const fullPath = path.join(archiveRealPath, fileRealPath) callback(null, fullPath) } else { callback(error) } }) } } const { realpath } = fs fs.realpath = wrapRealpath(realpath) fs.realpath.native = wrapRealpath(realpath.native) fs.promises.realpath = util.promisify(fs.realpath.native) const { exists } = fs fs.exists = (pathArgument, callback) => { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return exists(pathArgument, callback) const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) nextTick(callback, [error]) return } const pathExists = archive.stat(filePath) !== false nextTick(callback, [pathExists]) } fs.exists[util.promisify.custom] = (pathArgument) => { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return exists[util.promisify.custom](pathArgument) const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) return Promise.reject(error) } return Promise.resolve(archive.stat(filePath) !== false) } const { existsSync } = fs fs.existsSync = (pathArgument) => { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return existsSync(pathArgument) const archive = getOrCreateArchive(asarPath) if (!archive) return false return archive.stat(filePath) !== false } const { access } = fs fs.access = function (pathArgument, mode, callback) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return access.apply(this, arguments) if (typeof mode === 'function') { callback = mode mode = fs.constants.F_OK } const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) nextTick(callback, [error]) return } const info = archive.getFileInfo(filePath) if (!info) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } if (info.unpacked) { const realPath = archive.copyFileOut(filePath) return fs.access(realPath, mode, callback) } const stats = archive.stat(filePath) if (!stats) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } if (mode & fs.constants.W_OK) { const error = createError(AsarError.NO_ACCESS, { asarPath, filePath }) nextTick(callback, [error]) return } nextTick(callback) } fs.promises.access = util.promisify(fs.access) const { accessSync } = fs fs.accessSync = function (pathArgument, mode) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return accessSync.apply(this, arguments) if (mode == null) mode = fs.constants.F_OK const archive = getOrCreateArchive(asarPath) if (!archive) { throw createError(AsarError.INVALID_ARCHIVE, { asarPath }) } const info = archive.getFileInfo(filePath) if (!info) { throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) } if (info.unpacked) { const realPath = archive.copyFileOut(filePath) return fs.accessSync(realPath, mode) } const stats = archive.stat(filePath) if (!stats) { throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) } if (mode & fs.constants.W_OK) { throw createError(AsarError.NO_ACCESS, { asarPath, filePath }) } } function decryption(data, asarPath) { let key = getOrReadArchiveHeader(asarPath, fs) // console.warn('#### begin decrypt, key: ', key); if (!key) { return data } if (typeof data === 'string') { data = Buffer.from(data) } var cipherChunks = [] var decipher = crypto.createDecipheriv( 'aes-128-ecb', key, Buffer.from([]) ) decipher.setAutoPadding(false) cipherChunks.push(decipher.update(data)) cipherChunks.push(decipher.final()) return Buffer.concat(cipherChunks) } const { readFile } = fs fs.readFile = function (pathArgument, options, callback) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return readFile.apply(this, arguments) if (typeof options === 'function') { callback = options options = { encoding: null } } else if (typeof options === 'string') { options = { encoding: options } } else if (options === null || options === undefined) { options = { encoding: null } } else if (typeof options !== 'object') { throw new TypeError('Bad arguments') } const { encoding } = options const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) nextTick(callback, [error]) return } const info = archive.getFileInfo(filePath) if (!info) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } if (info.size === 0) { nextTick(callback, [null, encoding ? '' : Buffer.alloc(0)]) return } if (info.unpacked) { const realPath = archive.copyFileOut(filePath) return fs.readFile(realPath, options, callback) } const buffer = Buffer.alloc(info.size) const fd = archive.getFd() if (!(fd >= 0)) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } logASARAccess(asarPath, filePath, info.offset) fs.read(fd, buffer, 0, info.size, info.offset, (error) => { // ##################### // buffer // console.warn('### asar.js: fs.read, path: ', filePath, ' size:', info.size, ' offset: ', info.offset); let result = buffer if (info.encrypted) { result = decryption(result, asarPath) // console.warn('### asar.js: fs.read', result.toString().slice(0, 10)); } // ##################### callback(error, encoding ? result.toString(encoding) : result) }) } fs.promises.readFile = util.promisify(fs.readFile) const { readFileSync } = fs fs.readFileSync = function (pathArgument, options) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return readFileSync.apply(this, arguments) const archive = getOrCreateArchive(asarPath) if (!archive) throw createError(AsarError.INVALID_ARCHIVE, { asarPath }) const info = archive.getFileInfo(filePath) if (!info) throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) if (info.size === 0) return options ? '' : Buffer.alloc(0) if (info.unpacked) { const realPath = archive.copyFileOut(filePath) return fs.readFileSync(realPath, options) } if (!options) { options = { encoding: null } } else if (typeof options === 'string') { options = { encoding: options } } else if (typeof options !== 'object') { throw new TypeError('Bad arguments') } const { encoding } = options const buffer = Buffer.alloc(info.size) const fd = archive.getFd() if (!(fd >= 0)) throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) logASARAccess(asarPath, filePath, info.offset) fs.readSync(fd, buffer, 0, info.size, info.offset) // ##################### // buffer // console.warn('### asar.js: fs.readSync, path: ', filePath, ' size:', info.size, ' offset: ', info.offset); let header = archive.path let result = buffer if (info.encrypted) { result = decryption(buffer, asarPath) // console.warn('### asar.js: fs.readSync result', result.toString().slice(0, 10)); } // ##################### return encoding ? result.toString(encoding) : result } const { readdir } = fs fs.readdir = function (pathArgument, options = {}, callback) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (typeof options === 'function') { callback = options options = {} } if (!isAsar) return readdir.apply(this, arguments) const archive = getOrCreateArchive(asarPath) if (!archive) { const error = createError(AsarError.INVALID_ARCHIVE, { asarPath }) nextTick(callback, [error]) return } const files = archive.readdir(filePath) if (!files) { const error = createError(AsarError.NOT_FOUND, { asarPath, filePath }) nextTick(callback, [error]) return } if (options.withFileTypes) { const dirents = [] for (const file of files) { const stats = archive.stat(file) if (stats.isFile) { dirents.push(new fs.Dirent(file, fs.constants.UV_DIRENT_FILE)) } else if (stats.isDirectory) { dirents.push(new fs.Dirent(file, fs.constants.UV_DIRENT_DIR)) } else if (stats.isLink) { dirents.push(new fs.Dirent(file, fs.constants.UV_DIRENT_LINK)) } } nextTick(callback, [null, dirents]) return } nextTick(callback, [null, files]) } fs.promises.readdir = util.promisify(fs.readdir) const { readdirSync } = fs fs.readdirSync = function (pathArgument, options = {}) { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return readdirSync.apply(this, arguments) const archive = getOrCreateArchive(asarPath) if (!archive) { throw createError(AsarError.INVALID_ARCHIVE, { asarPath }) } const files = archive.readdir(filePath) if (!files) { throw createError(AsarError.NOT_FOUND, { asarPath, filePath }) } if (options.withFileTypes) { const dirents = [] for (const file of files) { const stats = archive.stat(file) if (stats.isFile) { dirents.push(new fs.Dirent(file, fs.constants.UV_DIRENT_FILE)) } else if (stats.isDirectory) { dirents.push(new fs.Dirent(file, fs.constants.UV_DIRENT_DIR)) } else if (stats.isLink) { dirents.push(new fs.Dirent(file, fs.constants.UV_DIRENT_LINK)) } } return dirents } return files } const { internalModuleReadJSON } = internalBinding('fs') internalBinding('fs').internalModuleReadJSON = (pathArgument) => { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return internalModuleReadJSON(pathArgument) const archive = getOrCreateArchive(asarPath) if (!archive) return const info = archive.getFileInfo(filePath) if (!info) return if (info.size === 0) return '' if (info.unpacked) { const realPath = archive.copyFileOut(filePath) return fs.readFileSync(realPath, { encoding: 'utf8' }) } const buffer = Buffer.alloc(info.size) const fd = archive.getFd() if (!(fd >= 0)) return logASARAccess(asarPath, filePath, info.offset) fs.readSync(fd, buffer, 0, info.size, info.offset) return buffer.toString('utf8') } const { internalModuleStat } = internalBinding('fs') internalBinding('fs').internalModuleStat = (pathArgument) => { const { isAsar, asarPath, filePath } = splitPath(pathArgument) if (!isAsar) return internalModuleStat(pathArgument) // -ENOENT const archive = getOrCreateArchive(asarPath) if (!archive) return -34 // -ENOENT const stats = archive.stat(filePath) if (!stats) return -34 return stats.isDirectory ? 1 : 0 } // Calling mkdir for directory inside asar archive should throw ENOTDIR // error, but on Windows it throws ENOENT. if (process.platform === 'win32') { const { mkdir } = fs fs.mkdir = (pathArgument, options, callback) => { if (typeof options === 'function') { callback = options options = {} } const { isAsar, filePath } = splitPath(pathArgument) if (isAsar && filePath.length > 0) { const error = createError(AsarError.NOT_DIR) nextTick(callback, [error]) return } mkdir(pathArgument, options, callback) } fs.promises.mkdir = util.promisify(fs.mkdir) const { mkdirSync } = fs fs.mkdirSync = function (pathArgument, options) { const { isAsar, filePath } = splitPath(pathArgument) if (isAsar && filePath.length) throw createError(AsarError.NOT_DIR) return mkdirSync(pathArgument, options) } } function invokeWithNoAsar(func) { return function () { const processNoAsarOriginalValue = process.noAsar process.noAsar = true try { return func.apply(this, arguments) } finally { process.noAsar = processNoAsarOriginalValue } } } // Strictly implementing the flags of fs.copyFile is hard, just do a simple // implementation for now. Doing 2 copies won't spend much time more as OS // has filesystem caching. overrideAPI(fs, 'copyFile') overrideAPISync(fs, 'copyFileSync') overrideAPI(fs, 'open') overrideAPISync(process, 'dlopen', 1) overrideAPISync(Module._extensions, '.node', 1) overrideAPISync(fs, 'openSync') const overrideChildProcess = (childProcess) => { // Executing a command string containing a path to an asar archive // confuses `childProcess.execFile`, which is internally called by // `childProcess.{exec,execSync}`, causing Electron to consider the full // command as a single path to an archive. const { exec, execSync } = childProcess childProcess.exec = invokeWithNoAsar(exec) childProcess.exec[util.promisify.custom] = invokeWithNoAsar( exec[util.promisify.custom] ) childProcess.execSync = invokeWithNoAsar(execSync) overrideAPI(childProcess, 'execFile') overrideAPISync(childProcess, 'execFileSync') } // Lazily override the child_process APIs only when child_process is // fetched the first time. We will eagerly override the child_process APIs // when this env var is set so that stack traces generated inside node unit // tests will match. This env var will only slow things down in users apps // and should not be used. if (process.env.ELECTRON_EAGER_ASAR_HOOK_FOR_TESTING) { overrideChildProcess(require('child_process')) } else { const originalModuleLoad = Module._load Module._load = (request, ...args) => { const loadResult = originalModuleLoad(request, ...args) if (request === 'child_process') { if (!v8Util.getHiddenValue(loadResult, 'asar-ready')) { v8Util.setHiddenValue(loadResult, 'asar-ready', true) // Just to make it obvious what we are dealing with here const childProcess = loadResult overrideChildProcess(childProcess) } } return loadResult } } }})() |
根据代码看，加密方式还是比较简单的，一个rsa, -个aes-128-ecb且都是标准算法。解密的过程其实在某个dll里，有兴趣的可以找找在哪个dll，找到了会有惊喜。
解密后，提取出的代码如下:
解密后就能对代码进行修改，增加自己需要的功能，然后重新打包。反正就是有了源码几乎可以随便折腾。
本帖所有代码只用于技术交流，请勿用于其他目的。