1 files changed, 60 insertions, 0 deletions
diff --git a/ext/node/polyfills/internal/crypto/_randomInt.ts b/ext/node/polyfills/internal/crypto/_randomInt.ts
new file mode 100644
index 000000000..637251541
--- /dev/null
+++ b/ext/node/polyfills/internal/crypto/_randomInt.ts
@@ -0,0 +1,60 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+export default function randomInt(max: number): number;
+export default function randomInt(min: number, max: number): number;
+export default function randomInt(
+  max: number,
+  cb: (err: Error | null, n?: number) => void,
+): void;
+export default function randomInt(
+  min: number,
+  max: number,
+  cb: (err: Error | null, n?: number) => void,
+): void;
+
+export default function randomInt(
+  max: number,
+  min?: ((err: Error | null, n?: number) => void) | number,
+  cb?: (err: Error | null, n?: number) => void,
+): number | void {
+  if (typeof max === "number" && typeof min === "number") {
+    [max, min] = [min, max];
+  }
+  if (min === undefined) min = 0;
+  else if (typeof min === "function") {
+    cb = min;
+    min = 0;
+  }
+
+  if (
+    !Number.isSafeInteger(min) ||
+    typeof max === "number" && !Number.isSafeInteger(max)
+  ) {
+    throw new Error("max or min is not a Safe Number");
+  }
+
+  if (max - min > Math.pow(2, 48)) {
+    throw new RangeError("max - min should be less than 2^48!");
+  }
+
+  if (min >= max) {
+    throw new Error("Min is bigger than Max!");
+  }
+
+  const randomBuffer = new Uint32Array(1);
+
+  globalThis.crypto.getRandomValues(randomBuffer);
+
+  const randomNumber = randomBuffer[0] / (0xffffffff + 1);
+
+  min = Math.ceil(min);
+  max = Math.floor(max);
+
+  const result = Math.floor(randomNumber * (max - min)) + min;
+
+  if (cb) {
+    cb(null, result);
+    return;
+  }
+
+  return result;
+}