use unique hashes when smuggling whitelist setting

4 files changed, 10 insertions, 551 deletions

diff --git a/background/background.html b/background/background.html
index d453c47..c6621e2 100644
--- a/background/background.html
+++ b/background/background.html
@@ -10,9 +10,10 @@
     <script src="./message_server.js"></script>
     <script src="/common/connection_types.js"></script>
     <script src="./storage_server.js"></script>
-    <script src="./url_item.js"></script>
-    <script src="./sha256.js"></script>
+    <script src="/common/url_item.js"></script>
+    <script src="/common/sha256.js"></script>
     <script src="./page_actions_server.js"></script>
+    <script src="/common/gen_unique.js"></script>
     <script src="./policy_smuggler.js"></script>
     <script src="./main.js"></script>
   </head>
diff --git a/background/policy_smuggler.js b/background/policy_smuggler.js
index 6d0da38..180dcb7 100644
--- a/background/policy_smuggler.js
+++ b/background/policy_smuggler.js
@@ -15,6 +15,7 @@
     const get_storage = window.get_storage;
     const browser = window.browser;
     const url_item = window.url_item;
+    const gen_unique = window.gen_unique;
 
     var storage;
 
@@ -26,12 +27,14 @@
 	let first_target = match[3];
 	let second_target = match[4];
 
-	if (first_target === "#myext-allow") {
+	let url = url_item(request.url);
+	let unique = gen_unique(url);
+
+	if (first_target === unique) {
 	    console.log(["not redirecting"]);
 	    return {cancel : false};
 	}
 
-	let url = url_item(request.url);
 	let settings = storage.get(TYPE_PREFIX.PAGE, url);
 	console.log("got", storage.get(TYPE_PREFIX.PAGE, url), "for", url);
 	if (settings === undefined || !settings.allow)
@@ -40,10 +43,10 @@
 	second_target = (first_target || "") + (second_target || "")
 
 	console.log(["redirecting", request.url,
-		     (base_url + "#myext-allow" + second_target)]);
+		     (base_url + unique + second_target)]);
 
 	return {
-	    redirectUrl : (base_url + "#myext-allow" + second_target)
+	    redirectUrl : (base_url + unique + second_target)
 	};
     }
 
diff --git a/background/sha256.js b/background/sha256.js
deleted file mode 100644
index 271ec87..0000000
--- a/background/sha256.js
+++ /dev/null
@@ -1,523 +0,0 @@
-/**
- * [js-sha256]{@link https://github.com/emn178/js-sha256/}
- *
- * @version 0.9.0
- * @author Chen, Yi-Cyuan [emn178@gmail.com]
- * @copyright Chen, Yi-Cyuan 2014-2017
- * @license MIT
- */
-
-"use strict";
-
-(() => {
-  var fake_window = {};
-
-  console.log('hello, crypto!');
-  var ERROR = 'input is invalid type';
-  var WINDOW = typeof window === 'object';
-  var root = /*WINDOW ? window : {}*/ fake_window;
-  if (root.JS_SHA256_NO_WINDOW) {
-    WINDOW = false;
-  }
-  var WEB_WORKER = !WINDOW && typeof self === 'object';
-  var NODE_JS = !root.JS_SHA256_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
-  if (NODE_JS) {
-    root = global;
-  } else if (WEB_WORKER) {
-    root = self;
-  }
-  var COMMON_JS = !root.JS_SHA256_NO_COMMON_JS && typeof module === 'object' && module.exports;
-  var AMD = typeof define === 'function' && define.amd;
-  var ARRAY_BUFFER = !root.JS_SHA256_NO_ARRAY_BUFFER && typeof ArrayBuffer !== 'undefined';
-  var HEX_CHARS = '0123456789abcdef'.split('');
-  var EXTRA = [-2147483648, 8388608, 32768, 128];
-  var SHIFT = [24, 16, 8, 0];
-  var K = [
-    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
-    0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
-    0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
-    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
-    0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
-    0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
-    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
-    0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
-  ];
-  var OUTPUT_TYPES = ['hex', 'array', 'digest', 'arrayBuffer'];
-
-  var blocks = [];
-
-  if (root.JS_SHA256_NO_NODE_JS || !Array.isArray) {
-    Array.isArray = function (obj) {
-      return Object.prototype.toString.call(obj) === '[object Array]';
-    };
-  }
-
-  if (ARRAY_BUFFER && (root.JS_SHA256_NO_ARRAY_BUFFER_IS_VIEW || !ArrayBuffer.isView)) {
-    ArrayBuffer.isView = function (obj) {
-      return typeof obj === 'object' && obj.buffer && obj.buffer.constructor === ArrayBuffer;
-    };
-  }
-
-  var createOutputMethod = function (outputType, is224) {
-    return function (message) {
-      return new Sha256(is224, true).update(message)[outputType]();
-    };
-  };
-
-  var createMethod = function (is224) {
-    var method = createOutputMethod('hex', is224);
-    if (NODE_JS) {
-      method = nodeWrap(method, is224);
-    }
-    method.create = function () {
-      return new Sha256(is224);
-    };
-    method.update = function (message) {
-      return method.create().update(message);
-    };
-    for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
-      var type = OUTPUT_TYPES[i];
-      method[type] = createOutputMethod(type, is224);
-    }
-    return method;
-  };
-
-  var nodeWrap = function (method, is224) {
-    var crypto = eval("require('crypto')");
-    var Buffer = eval("require('buffer').Buffer");
-    var algorithm = is224 ? 'sha224' : 'sha256';
-    var nodeMethod = function (message) {
-      if (typeof message === 'string') {
-        return crypto.createHash(algorithm).update(message, 'utf8').digest('hex');
-      } else {
-        if (message === null || message === undefined) {
-          throw new Error(ERROR);
-        } else if (message.constructor === ArrayBuffer) {
-          message = new Uint8Array(message);
-        }
-      }
-      if (Array.isArray(message) || ArrayBuffer.isView(message) ||
-        message.constructor === Buffer) {
-        return crypto.createHash(algorithm).update(new Buffer(message)).digest('hex');
-      } else {
-        return method(message);
-      }
-    };
-    return nodeMethod;
-  };
-
-  var createHmacOutputMethod = function (outputType, is224) {
-    return function (key, message) {
-      return new HmacSha256(key, is224, true).update(message)[outputType]();
-    };
-  };
-
-  var createHmacMethod = function (is224) {
-    var method = createHmacOutputMethod('hex', is224);
-    method.create = function (key) {
-      return new HmacSha256(key, is224);
-    };
-    method.update = function (key, message) {
-      return method.create(key).update(message);
-    };
-    for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
-      var type = OUTPUT_TYPES[i];
-      method[type] = createHmacOutputMethod(type, is224);
-    }
-    return method;
-  };
-
-  function Sha256(is224, sharedMemory) {
-    if (sharedMemory) {
-      blocks[0] = blocks[16] = blocks[1] = blocks[2] = blocks[3] =
-        blocks[4] = blocks[5] = blocks[6] = blocks[7] =
-        blocks[8] = blocks[9] = blocks[10] = blocks[11] =
-        blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
-      this.blocks = blocks;
-    } else {
-      this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
-    }
-
-    if (is224) {
-      this.h0 = 0xc1059ed8;
-      this.h1 = 0x367cd507;
-      this.h2 = 0x3070dd17;
-      this.h3 = 0xf70e5939;
-      this.h4 = 0xffc00b31;
-      this.h5 = 0x68581511;
-      this.h6 = 0x64f98fa7;
-      this.h7 = 0xbefa4fa4;
-    } else { // 256
-      this.h0 = 0x6a09e667;
-      this.h1 = 0xbb67ae85;
-      this.h2 = 0x3c6ef372;
-      this.h3 = 0xa54ff53a;
-      this.h4 = 0x510e527f;
-      this.h5 = 0x9b05688c;
-      this.h6 = 0x1f83d9ab;
-      this.h7 = 0x5be0cd19;
-    }
-
-    this.block = this.start = this.bytes = this.hBytes = 0;
-    this.finalized = this.hashed = false;
-    this.first = true;
-    this.is224 = is224;
-  }
-
-  Sha256.prototype.update = function (message) {
-    if (this.finalized) {
-      return;
-    }
-    var notString, type = typeof message;
-    if (type !== 'string') {
-      if (type === 'object') {
-        if (message === null) {
-          throw new Error(ERROR);
-        } else if (ARRAY_BUFFER && message.constructor === ArrayBuffer) {
-          message = new Uint8Array(message);
-        } else if (!Array.isArray(message)) {
-          if (!ARRAY_BUFFER || !ArrayBuffer.isView(message)) {
-            throw new Error(ERROR);
-          }
-        }
-      } else {
-        throw new Error(ERROR);
-      }
-      notString = true;
-    }
-    var code, index = 0, i, length = message.length, blocks = this.blocks;
-
-    while (index < length) {
-      if (this.hashed) {
-        this.hashed = false;
-        blocks[0] = this.block;
-        blocks[16] = blocks[1] = blocks[2] = blocks[3] =
-          blocks[4] = blocks[5] = blocks[6] = blocks[7] =
-          blocks[8] = blocks[9] = blocks[10] = blocks[11] =
-          blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
-      }
-
-      if (notString) {
-        for (i = this.start; index < length && i < 64; ++index) {
-          blocks[i >> 2] |= message[index] << SHIFT[i++ & 3];
-        }
-      } else {
-        for (i = this.start; index < length && i < 64; ++index) {
-          code = message.charCodeAt(index);
-          if (code < 0x80) {
-            blocks[i >> 2] |= code << SHIFT[i++ & 3];
-          } else if (code < 0x800) {
-            blocks[i >> 2] |= (0xc0 | (code >> 6)) << SHIFT[i++ & 3];
-            blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
-          } else if (code < 0xd800 || code >= 0xe000) {
-            blocks[i >> 2] |= (0xe0 | (code >> 12)) << SHIFT[i++ & 3];
-            blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
-            blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
-          } else {
-            code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
-            blocks[i >> 2] |= (0xf0 | (code >> 18)) << SHIFT[i++ & 3];
-            blocks[i >> 2] |= (0x80 | ((code >> 12) & 0x3f)) << SHIFT[i++ & 3];
-            blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
-            blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
-          }
-        }
-      }
-
-      this.lastByteIndex = i;
-      this.bytes += i - this.start;
-      if (i >= 64) {
-        this.block = blocks[16];
-        this.start = i - 64;
-        this.hash();
-        this.hashed = true;
-      } else {
-        this.start = i;
-      }
-    }
-    if (this.bytes > 4294967295) {
-      this.hBytes += this.bytes / 4294967296 << 0;
-      this.bytes = this.bytes % 4294967296;
-    }
-    return this;
-  };
-
-  Sha256.prototype.finalize = function () {
-    if (this.finalized) {
-      return;
-    }
-    this.finalized = true;
-    var blocks = this.blocks, i = this.lastByteIndex;
-    blocks[16] = this.block;
-    blocks[i >> 2] |= EXTRA[i & 3];
-    this.block = blocks[16];
-    if (i >= 56) {
-      if (!this.hashed) {
-        this.hash();
-      }
-      blocks[0] = this.block;
-      blocks[16] = blocks[1] = blocks[2] = blocks[3] =
-        blocks[4] = blocks[5] = blocks[6] = blocks[7] =
-        blocks[8] = blocks[9] = blocks[10] = blocks[11] =
-        blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
-    }
-    blocks[14] = this.hBytes << 3 | this.bytes >>> 29;
-    blocks[15] = this.bytes << 3;
-    this.hash();
-  };
-
-  Sha256.prototype.hash = function () {
-    var a = this.h0, b = this.h1, c = this.h2, d = this.h3, e = this.h4, f = this.h5, g = this.h6,
-      h = this.h7, blocks = this.blocks, j, s0, s1, maj, t1, t2, ch, ab, da, cd, bc;
-
-    for (j = 16; j < 64; ++j) {
-      // rightrotate
-      t1 = blocks[j - 15];
-      s0 = ((t1 >>> 7) | (t1 << 25)) ^ ((t1 >>> 18) | (t1 << 14)) ^ (t1 >>> 3);
-      t1 = blocks[j - 2];
-      s1 = ((t1 >>> 17) | (t1 << 15)) ^ ((t1 >>> 19) | (t1 << 13)) ^ (t1 >>> 10);
-      blocks[j] = blocks[j - 16] + s0 + blocks[j - 7] + s1 << 0;
-    }
-
-    bc = b & c;
-    for (j = 0; j < 64; j += 4) {
-      if (this.first) {
-        if (this.is224) {
-          ab = 300032;
-          t1 = blocks[0] - 1413257819;
-          h = t1 - 150054599 << 0;
-          d = t1 + 24177077 << 0;
-        } else {
-          ab = 704751109;
-          t1 = blocks[0] - 210244248;
-          h = t1 - 1521486534 << 0;
-          d = t1 + 143694565 << 0;
-        }
-        this.first = false;
-      } else {
-        s0 = ((a >>> 2) | (a << 30)) ^ ((a >>> 13) | (a << 19)) ^ ((a >>> 22) | (a << 10));
-        s1 = ((e >>> 6) | (e << 26)) ^ ((e >>> 11) | (e << 21)) ^ ((e >>> 25) | (e << 7));
-        ab = a & b;
-        maj = ab ^ (a & c) ^ bc;
-        ch = (e & f) ^ (~e & g);
-        t1 = h + s1 + ch + K[j] + blocks[j];
-        t2 = s0 + maj;
-        h = d + t1 << 0;
-        d = t1 + t2 << 0;
-      }
-      s0 = ((d >>> 2) | (d << 30)) ^ ((d >>> 13) | (d << 19)) ^ ((d >>> 22) | (d << 10));
-      s1 = ((h >>> 6) | (h << 26)) ^ ((h >>> 11) | (h << 21)) ^ ((h >>> 25) | (h << 7));
-      da = d & a;
-      maj = da ^ (d & b) ^ ab;
-      ch = (h & e) ^ (~h & f);
-      t1 = g + s1 + ch + K[j + 1] + blocks[j + 1];
-      t2 = s0 + maj;
-      g = c + t1 << 0;
-      c = t1 + t2 << 0;
-      s0 = ((c >>> 2) | (c << 30)) ^ ((c >>> 13) | (c << 19)) ^ ((c >>> 22) | (c << 10));
-      s1 = ((g >>> 6) | (g << 26)) ^ ((g >>> 11) | (g << 21)) ^ ((g >>> 25) | (g << 7));
-      cd = c & d;
-      maj = cd ^ (c & a) ^ da;
-      ch = (g & h) ^ (~g & e);
-      t1 = f + s1 + ch + K[j + 2] + blocks[j + 2];
-      t2 = s0 + maj;
-      f = b + t1 << 0;
-      b = t1 + t2 << 0;
-      s0 = ((b >>> 2) | (b << 30)) ^ ((b >>> 13) | (b << 19)) ^ ((b >>> 22) | (b << 10));
-      s1 = ((f >>> 6) | (f << 26)) ^ ((f >>> 11) | (f << 21)) ^ ((f >>> 25) | (f << 7));
-      bc = b & c;
-      maj = bc ^ (b & d) ^ cd;
-      ch = (f & g) ^ (~f & h);
-      t1 = e + s1 + ch + K[j + 3] + blocks[j + 3];
-      t2 = s0 + maj;
-      e = a + t1 << 0;
-      a = t1 + t2 << 0;
-    }
-
-    this.h0 = this.h0 + a << 0;
-    this.h1 = this.h1 + b << 0;
-    this.h2 = this.h2 + c << 0;
-    this.h3 = this.h3 + d << 0;
-    this.h4 = this.h4 + e << 0;
-    this.h5 = this.h5 + f << 0;
-    this.h6 = this.h6 + g << 0;
-    this.h7 = this.h7 + h << 0;
-  };
-
-  Sha256.prototype.hex = function () {
-    this.finalize();
-
-    var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
-      h6 = this.h6, h7 = this.h7;
-
-    var hex = HEX_CHARS[(h0 >> 28) & 0x0F] + HEX_CHARS[(h0 >> 24) & 0x0F] +
-      HEX_CHARS[(h0 >> 20) & 0x0F] + HEX_CHARS[(h0 >> 16) & 0x0F] +
-      HEX_CHARS[(h0 >> 12) & 0x0F] + HEX_CHARS[(h0 >> 8) & 0x0F] +
-      HEX_CHARS[(h0 >> 4) & 0x0F] + HEX_CHARS[h0 & 0x0F] +
-      HEX_CHARS[(h1 >> 28) & 0x0F] + HEX_CHARS[(h1 >> 24) & 0x0F] +
-      HEX_CHARS[(h1 >> 20) & 0x0F] + HEX_CHARS[(h1 >> 16) & 0x0F] +
-      HEX_CHARS[(h1 >> 12) & 0x0F] + HEX_CHARS[(h1 >> 8) & 0x0F] +
-      HEX_CHARS[(h1 >> 4) & 0x0F] + HEX_CHARS[h1 & 0x0F] +
-      HEX_CHARS[(h2 >> 28) & 0x0F] + HEX_CHARS[(h2 >> 24) & 0x0F] +
-      HEX_CHARS[(h2 >> 20) & 0x0F] + HEX_CHARS[(h2 >> 16) & 0x0F] +
-      HEX_CHARS[(h2 >> 12) & 0x0F] + HEX_CHARS[(h2 >> 8) & 0x0F] +
-      HEX_CHARS[(h2 >> 4) & 0x0F] + HEX_CHARS[h2 & 0x0F] +
-      HEX_CHARS[(h3 >> 28) & 0x0F] + HEX_CHARS[(h3 >> 24) & 0x0F] +
-      HEX_CHARS[(h3 >> 20) & 0x0F] + HEX_CHARS[(h3 >> 16) & 0x0F] +
-      HEX_CHARS[(h3 >> 12) & 0x0F] + HEX_CHARS[(h3 >> 8) & 0x0F] +
-      HEX_CHARS[(h3 >> 4) & 0x0F] + HEX_CHARS[h3 & 0x0F] +
-      HEX_CHARS[(h4 >> 28) & 0x0F] + HEX_CHARS[(h4 >> 24) & 0x0F] +
-      HEX_CHARS[(h4 >> 20) & 0x0F] + HEX_CHARS[(h4 >> 16) & 0x0F] +
-      HEX_CHARS[(h4 >> 12) & 0x0F] + HEX_CHARS[(h4 >> 8) & 0x0F] +
-      HEX_CHARS[(h4 >> 4) & 0x0F] + HEX_CHARS[h4 & 0x0F] +
-      HEX_CHARS[(h5 >> 28) & 0x0F] + HEX_CHARS[(h5 >> 24) & 0x0F] +
-      HEX_CHARS[(h5 >> 20) & 0x0F] + HEX_CHARS[(h5 >> 16) & 0x0F] +
-      HEX_CHARS[(h5 >> 12) & 0x0F] + HEX_CHARS[(h5 >> 8) & 0x0F] +
-      HEX_CHARS[(h5 >> 4) & 0x0F] + HEX_CHARS[h5 & 0x0F] +
-      HEX_CHARS[(h6 >> 28) & 0x0F] + HEX_CHARS[(h6 >> 24) & 0x0F] +
-      HEX_CHARS[(h6 >> 20) & 0x0F] + HEX_CHARS[(h6 >> 16) & 0x0F] +
-      HEX_CHARS[(h6 >> 12) & 0x0F] + HEX_CHARS[(h6 >> 8) & 0x0F] +
-      HEX_CHARS[(h6 >> 4) & 0x0F] + HEX_CHARS[h6 & 0x0F];
-    if (!this.is224) {
-      hex += HEX_CHARS[(h7 >> 28) & 0x0F] + HEX_CHARS[(h7 >> 24) & 0x0F] +
-        HEX_CHARS[(h7 >> 20) & 0x0F] + HEX_CHARS[(h7 >> 16) & 0x0F] +
-        HEX_CHARS[(h7 >> 12) & 0x0F] + HEX_CHARS[(h7 >> 8) & 0x0F] +
-        HEX_CHARS[(h7 >> 4) & 0x0F] + HEX_CHARS[h7 & 0x0F];
-    }
-    return hex;
-  };
-
-  Sha256.prototype.toString = Sha256.prototype.hex;
-
-  Sha256.prototype.digest = function () {
-    this.finalize();
-
-    var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
-      h6 = this.h6, h7 = this.h7;
-
-    var arr = [
-      (h0 >> 24) & 0xFF, (h0 >> 16) & 0xFF, (h0 >> 8) & 0xFF, h0 & 0xFF,
-      (h1 >> 24) & 0xFF, (h1 >> 16) & 0xFF, (h1 >> 8) & 0xFF, h1 & 0xFF,
-      (h2 >> 24) & 0xFF, (h2 >> 16) & 0xFF, (h2 >> 8) & 0xFF, h2 & 0xFF,
-      (h3 >> 24) & 0xFF, (h3 >> 16) & 0xFF, (h3 >> 8) & 0xFF, h3 & 0xFF,
-      (h4 >> 24) & 0xFF, (h4 >> 16) & 0xFF, (h4 >> 8) & 0xFF, h4 & 0xFF,
-      (h5 >> 24) & 0xFF, (h5 >> 16) & 0xFF, (h5 >> 8) & 0xFF, h5 & 0xFF,
-      (h6 >> 24) & 0xFF, (h6 >> 16) & 0xFF, (h6 >> 8) & 0xFF, h6 & 0xFF
-    ];
-    if (!this.is224) {
-      arr.push((h7 >> 24) & 0xFF, (h7 >> 16) & 0xFF, (h7 >> 8) & 0xFF, h7 & 0xFF);
-    }
-    return arr;
-  };
-
-  Sha256.prototype.array = Sha256.prototype.digest;
-
-  Sha256.prototype.arrayBuffer = function () {
-    this.finalize();
-
-    var buffer = new ArrayBuffer(this.is224 ? 28 : 32);
-    var dataView = new DataView(buffer);
-    dataView.setUint32(0, this.h0);
-    dataView.setUint32(4, this.h1);
-    dataView.setUint32(8, this.h2);
-    dataView.setUint32(12, this.h3);
-    dataView.setUint32(16, this.h4);
-    dataView.setUint32(20, this.h5);
-    dataView.setUint32(24, this.h6);
-    if (!this.is224) {
-      dataView.setUint32(28, this.h7);
-    }
-    return buffer;
-  };
-
-  function HmacSha256(key, is224, sharedMemory) {
-    var i, type = typeof key;
-    if (type === 'string') {
-      var bytes = [], length = key.length, index = 0, code;
-      for (i = 0; i < length; ++i) {
-        code = key.charCodeAt(i);
-        if (code < 0x80) {
-          bytes[index++] = code;
-        } else if (code < 0x800) {
-          bytes[index++] = (0xc0 | (code >> 6));
-          bytes[index++] = (0x80 | (code & 0x3f));
-        } else if (code < 0xd800 || code >= 0xe000) {
-          bytes[index++] = (0xe0 | (code >> 12));
-          bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
-          bytes[index++] = (0x80 | (code & 0x3f));
-        } else {
-          code = 0x10000 + (((code & 0x3ff) << 10) | (key.charCodeAt(++i) & 0x3ff));
-          bytes[index++] = (0xf0 | (code >> 18));
-          bytes[index++] = (0x80 | ((code >> 12) & 0x3f));
-          bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
-          bytes[index++] = (0x80 | (code & 0x3f));
-        }
-      }
-      key = bytes;
-    } else {
-      if (type === 'object') {
-        if (key === null) {
-          throw new Error(ERROR);
-        } else if (ARRAY_BUFFER && key.constructor === ArrayBuffer) {
-          key = new Uint8Array(key);
-        } else if (!Array.isArray(key)) {
-          if (!ARRAY_BUFFER || !ArrayBuffer.isView(key)) {
-            throw new Error(ERROR);
-          }
-        }
-      } else {
-        throw new Error(ERROR);
-      }
-    }
-
-    if (key.length > 64) {
-      key = (new Sha256(is224, true)).update(key).array();
-    }
-
-    var oKeyPad = [], iKeyPad = [];
-    for (i = 0; i < 64; ++i) {
-      var b = key[i] || 0;
-      oKeyPad[i] = 0x5c ^ b;
-      iKeyPad[i] = 0x36 ^ b;
-    }
-
-    Sha256.call(this, is224, sharedMemory);
-
-    this.update(iKeyPad);
-    this.oKeyPad = oKeyPad;
-    this.inner = true;
-    this.sharedMemory = sharedMemory;
-  }
-  HmacSha256.prototype = new Sha256();
-
-  HmacSha256.prototype.finalize = function () {
-    Sha256.prototype.finalize.call(this);
-    if (this.inner) {
-      this.inner = false;
-      var innerHash = this.array();
-      Sha256.call(this, this.is224, this.sharedMemory);
-      this.update(this.oKeyPad);
-      this.update(innerHash);
-      Sha256.prototype.finalize.call(this);
-    }
-  };
-
-  var exports = createMethod();
-  exports.sha256 = exports;
-  exports.sha224 = createMethod(true);
-  exports.sha256.hmac = createHmacMethod();
-  exports.sha224.hmac = createHmacMethod(true);
-
-  if (COMMON_JS) {
-    module.exports = exports;
-  } else {
-    root.sha256 = exports.sha256;
-    root.sha224 = exports.sha224;
-    if (AMD) {
-      define(function () {
-        return exports;
-      });
-    }
-  }
-
-  window.sha256 = fake_window.sha256;
-})();
diff --git a/background/url_item.js b/background/url_item.js
deleted file mode 100644
index 7850871..0000000
--- a/background/url_item.js
+++ /dev/null
@@ -1,22 +0,0 @@
-/**
-* Myext stripping url from query and target
-*
-* Copyright (C) 2021 Wojtek Kosior
-*
-* Dual-licensed under:
-*   - 0BSD license
-*   - GPLv3 or (at your option) any later version
-*/
-
-"use strict";
-
-(() => {
-    function url_item(url)
-    {
-	let url_re = /^([^?#]*).*$/;
-	let match = url_re.exec(url);
-	return match[1];
-    }
-
-    window.url_item = url_item;
-})();