1 files changed, 22 insertions, 0 deletions
diff --git a/ext/node/polyfills/_crypto/crypto_browserify/public_encrypt/mgf.js b/ext/node/polyfills/_crypto/crypto_browserify/public_encrypt/mgf.js
new file mode 100644
index 000000000..5bb41f896
--- /dev/null
+++ b/ext/node/polyfills/_crypto/crypto_browserify/public_encrypt/mgf.js
@@ -0,0 +1,22 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// Copyright 2017 Calvin Metcalf. All rights reserved. MIT license.
+
+import { createHash } from "internal:deno_node/polyfills/internal/crypto/hash.ts";
+import { Buffer } from "internal:deno_node/polyfills/buffer.ts";
+
+export default function (seed, len) {
+  let t = Buffer.alloc(0);
+  let i = 0;
+  let c;
+  while (t.length < len) {
+    c = i2ops(i++);
+    t = Buffer.concat([t, createHash("sha1").update(seed).update(c).digest()]);
+  }
+  return t.slice(0, len);
+}
+
+function i2ops(c) {
+  const out = Buffer.allocUnsafe(4);
+  out.writeUInt32BE(c, 0);
+  return out;
+}