Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #331 from 5saviahv/master
Modified addLocalFile so it will read file stats from file
- Loading branch information
Showing
7 changed files
with
206 additions
and
82 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,3 @@ | ||
| exports.Deflater = require("./deflater"); | ||
| exports.Inflater = require("./inflater"); | ||
| exports.Inflater = require("./inflater"); | ||
| exports.ZipCrypto = require("./zipcrypto"); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| // generate CRC32 lookup table | ||
| const crctable = (new Uint32Array(256)).map((t,crc)=>{ | ||
| for(let j=0;j<8;j++){ | ||
| if (0 !== (crc & 1)){ | ||
| crc = (crc >>> 1) ^ 0xEDB88320 | ||
| }else{ | ||
| crc >>>= 1 | ||
| } | ||
| } | ||
| return crc>>>0; | ||
| }); | ||
|
|
||
| function make_decrypter(/*Buffer*/pwd){ | ||
| // C-style uInt32 Multiply | ||
| const uMul = (a,b) => Math.imul(a, b) >>> 0; | ||
| // Initialize keys with default values | ||
| const keys = new Uint32Array([0x12345678, 0x23456789, 0x34567890]); | ||
| // crc32 byte update | ||
| const crc32update = (pCrc32, bval) => { | ||
| return crctable[(pCrc32 ^ bval) & 0xff] ^ (pCrc32 >>> 8); | ||
| } | ||
| // update keys with byteValues | ||
| const updateKeys = (byteValue) => { | ||
| keys[0] = crc32update(keys[0], byteValue); | ||
| keys[1] += keys[0] & 0xff; | ||
| keys[1] = uMul(keys[1], 134775813) + 1; | ||
| keys[2] = crc32update(keys[2], keys[1] >>> 24); | ||
| } | ||
|
|
||
| // 1. Stage initialize key | ||
| const pass = (Buffer.isBuffer(pwd)) ? pwd : Buffer.from(pwd); | ||
| for(let i=0; i< pass.length; i++){ | ||
| updateKeys(pass[i]); | ||
| } | ||
|
|
||
| // return decrypter function | ||
| return function (/*Buffer*/data){ | ||
| if (!Buffer.isBuffer(data)){ | ||
| throw 'decrypter needs Buffer' | ||
| } | ||
| // result - we create new Buffer for results | ||
| const result = Buffer.alloc(data.length); | ||
| let pos = 0; | ||
| // process input data | ||
| for(let c of data){ | ||
| const k = (keys[2] | 2) >>> 0; // key | ||
| c ^= (uMul(k, k^1) >> 8) & 0xff; // decode | ||
| result[pos++] = c; // Save Value | ||
| updateKeys(c); // update keys with decoded byte | ||
| } | ||
| return result; | ||
| } | ||
| } | ||
|
|
||
| function decrypt(/*Buffer*/ data, /*Object*/header, /*String, Buffer*/ pwd){ | ||
| if (!data || !Buffer.isBuffer(data) || data.length < 12) { | ||
| return Buffer.alloc(0); | ||
| } | ||
|
|
||
| // We Initialize and generate decrypting function | ||
| const decrypter = make_decrypter(pwd); | ||
|
|
||
| // check - for testing password | ||
| const check = header.crc >>> 24; | ||
| // decrypt salt what is always 12 bytes and is a part of file content | ||
| const testbyte = decrypter(data.slice(0, 12))[11]; | ||
|
|
||
| // does password meet expectations | ||
| if (check !== testbyte){ | ||
| throw 'ADM-ZIP: Wrong Password'; | ||
| } | ||
|
|
||
| // decode content | ||
| return decrypter(data.slice(12)); | ||
| } | ||
|
|
||
| module.exports = {decrypt}; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.