fixed issues w/ accessing website on other computers

dashboard/js/data.js

@@ -10,6 +10,34 @@ const ENVELOPE_KEYS = Object.freeze([
   "population_estimate_allowed",
   "schema_version",
 ]);
+const SHA256_INITIAL_STATE = Object.freeze([
+  0x6a09e667,
+  0xbb67ae85,
+  0x3c6ef372,
+  0xa54ff53a,
+  0x510e527f,
+  0x9b05688c,
+  0x1f83d9ab,
+  0x5be0cd19,
+]);
+const SHA256_ROUND_CONSTANTS = Object.freeze([
+  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,
+]);
 
 export const REQUIRED_ASSETS = Object.freeze({
   manifest: "data_manifest.json",
@@ -541,9 +569,80 @@ function parseJsonBytes(bytes, label) {
   }
 }
 
+function rotateRight(value, shift) {
+  return ((value >>> shift) | (value << (32 - shift))) >>> 0;
+}
+
+function sha256HexFallback(bytes) {
+  const input = new Uint8Array(bytes);
+  const bitLength = input.byteLength * 8;
+  if (!Number.isSafeInteger(bitLength)) {
+    throw new DataContractError("Dashboard asset integrity verification failed.");
+  }
+
+  const paddedLength = Math.ceil((input.byteLength + 9) / 64) * 64;
+  const padded = new Uint8Array(paddedLength);
+  padded.set(input);
+  padded[input.byteLength] = 0x80;
+
+  const paddedView = new DataView(padded.buffer);
+  paddedView.setUint32(paddedLength - 8, Math.floor(bitLength / 0x100000000), false);
+  paddedView.setUint32(paddedLength - 4, bitLength >>> 0, false);
+
+  const state = [...SHA256_INITIAL_STATE];
+  const words = new Uint32Array(64);
+  for (let offset = 0; offset < paddedLength; offset += 64) {
+    for (let index = 0; index < 16; index += 1) {
+      words[index] = paddedView.getUint32(offset + index * 4, false);
+    }
+    for (let index = 16; index < 64; index += 1) {
+      const sigma0 =
+        rotateRight(words[index - 15], 7) ^
+        rotateRight(words[index - 15], 18) ^
+        (words[index - 15] >>> 3);
+      const sigma1 =
+        rotateRight(words[index - 2], 17) ^
+        rotateRight(words[index - 2], 19) ^
+        (words[index - 2] >>> 10);
+      words[index] =
+        (words[index - 16] + sigma0 + words[index - 7] + sigma1) >>> 0;
+    }
+
+    let [a, b, c, d, e, f, g, h] = state;
+    for (let index = 0; index < 64; index += 1) {
+      const sum1 = rotateRight(e, 6) ^ rotateRight(e, 11) ^ rotateRight(e, 25);
+      const choose = (e & f) ^ (~e & g);
+      const temporary1 =
+        (h + sum1 + choose + SHA256_ROUND_CONSTANTS[index] + words[index]) >>> 0;
+      const sum0 = rotateRight(a, 2) ^ rotateRight(a, 13) ^ rotateRight(a, 22);
+      const majority = (a & b) ^ (a & c) ^ (b & c);
+      const temporary2 = (sum0 + majority) >>> 0;
+      h = g;
+      g = f;
+      f = e;
+      e = (d + temporary1) >>> 0;
+      d = c;
+      c = b;
+      b = a;
+      a = (temporary1 + temporary2) >>> 0;
+    }
+
+    state[0] = (state[0] + a) >>> 0;
+    state[1] = (state[1] + b) >>> 0;
+    state[2] = (state[2] + c) >>> 0;
+    state[3] = (state[3] + d) >>> 0;
+    state[4] = (state[4] + e) >>> 0;
+    state[5] = (state[5] + f) >>> 0;
+    state[6] = (state[6] + g) >>> 0;
+    state[7] = (state[7] + h) >>> 0;
+  }
+
+  return state.map((word) => word.toString(16).padStart(8, "0")).join("");
+}
+
 async function sha256Hex(bytes, cryptoImplementation) {
   if (!cryptoImplementation?.subtle || typeof cryptoImplementation.subtle.digest !== "function") {
-    throw new DataContractError("This browser cannot verify dashboard asset integrity.");
+    return sha256HexFallback(bytes);
   }
   let digest;
   try {