[web]implement in-house sha1 hash function (#18651)

* implement in-house sha1 hash function

* add comment

* add test description

Co-authored-by: Antoine Clausse <antoine.clausse@overleaf.com>

* add more tests

* dedupe test strings and remove unneeded toString calls

---------

Co-authored-by: Antoine Clausse <antoine.clausse@overleaf.com>
GitOrigin-RevId: aa3f5ab3ff412696c715521381eebf176f503197

services/web/frontend/js/shared/utils/crypto.js

@@ -0,0 +1,41 @@
+/**
+ * From: https://github.com/pvorb/node-crypt/blob/master/crypt.js
+ * Copyright © 2011, Paul Vorbach. All rights reserved.
+ * Copyright © 2009, Jeff Mott. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ *    conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+ *    conditions and the following disclaimer in the documentation and/or other materials
+ *    provided with the distribution.
+ * 3. Neither the name Crypto-JS nor the names of its contributors may be used to endorse or
+ *    promote products derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// Convert a byte array to big-endian 32-bit words
+export function bytesToWords(bytes) {
+  const words = []
+  for (let i = 0, b = 0; i < bytes.length; i++, b += 8)
+    words[b >>> 5] |= bytes[i] << (24 - (b % 32))
+  return words
+}
+
+// Convert big-endian 32-bit words to a byte array
+export function wordsToBytes(words) {
+  const bytes = []
+  for (let b = 0; b < words.length * 32; b += 8)
+    bytes.push((words[b >>> 5] >>> (24 - (b % 32))) & 0xff)
+  return bytes
+}