From 159f527d9ae0aa23044417bcb0ecff447a54d456 Mon Sep 17 00:00:00 2001
From: RemixDev <RemixDev64@gmail.com>
Date: Sun, 25 Jul 2021 13:22:17 +0200
Subject: [PATCH] Added Blowfish decryption fallback

---
 deemix/utils/crypto.js | 19 ++++++++++++++++---
 package.json           |  1 +
 yarn.lock              |  5 +++++
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/deemix/utils/crypto.js b/deemix/utils/crypto.js
index 195898a..d76fa78 100644
--- a/deemix/utils/crypto.js
+++ b/deemix/utils/crypto.js
@@ -1,4 +1,8 @@
 const crypto = require('crypto')
+let Blowfish
+try {
+  Blowfish = require('egoroof-blowfish')
+} catch (e) { /* empty */ }
 
 function _md5 (data, type = 'binary') {
   let md5sum = crypto.createHash('md5')
@@ -29,9 +33,18 @@ function generateBlowfishKey(trackId) {
 }
 
 function decryptChunk(chunk, blowFishKey){
-  var cipher = crypto.createDecipheriv('bf-cbc', blowFishKey, Buffer.from([0, 1, 2, 3, 4, 5, 6, 7]))
-  cipher.setAutoPadding(false)
-  return Buffer.concat([cipher.update(chunk), cipher.final()])
+  let ciphers = crypto.getCiphers()
+  if (ciphers.includes('bf-cbc')){
+    let cipher = crypto.createDecipheriv('bf-cbc', blowFishKey, Buffer.from([0, 1, 2, 3, 4, 5, 6, 7]))
+    cipher.setAutoPadding(false)
+    return Buffer.concat([cipher.update(chunk), cipher.final()])
+  }
+  if (Blowfish){
+    let cipher = new Blowfish(blowFishKey, Blowfish.MODE.CBC, Blowfish.PADDING.NULL)
+    cipher.setIv(Buffer.from([0, 1, 2, 3, 4, 5, 6, 7]))
+    return Buffer.from(cipher.decode(chunk, Blowfish.TYPE.UINT8_ARRAY))
+  }
+  throw new Error("Can't find a way to decrypt chunks")
 }
 
 module.exports = {
diff --git a/package.json b/package.json
index 528a43d..5be378f 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
     "async": "^3.2.0",
     "crypto": "^1.0.1",
     "deezer-js": "^1.0.2",
+    "egoroof-blowfish": "^2.2.2",
     "got": "^11.8.2",
     "metaflac-js2": "^1.0.7",
     "spotify-web-api-node": "^5.0.2"
diff --git a/yarn.lock b/yarn.lock
index 7f02cd6..3f5d801 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -403,6 +403,11 @@ ecc-jsbn@~0.1.1:
     jsbn "~0.1.0"
     safer-buffer "^2.1.0"
 
+egoroof-blowfish@^2.2.2:
+  version "2.2.2"
+  resolved "https://registry.yarnpkg.com/egoroof-blowfish/-/egoroof-blowfish-2.2.2.tgz#d9ad386a8d2f8ddb55f2f7ff00341fc7565f9222"
+  integrity sha512-J2YRdTmgeebSiLB/WN2p5shat6eCnc7L/fM5SX9E8Yi0HGBWHcE6lQnHVCoXmkUflIwFU2j1/XcERYBdilMECA==
+
 emoji-regex@^8.0.0:
   version "8.0.0"
   resolved "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz"