1 files changed, 19 insertions, 0 deletions
diff --git a/ext/node/polyfills/internal/crypto/_hex.ts b/ext/node/polyfills/internal/crypto/_hex.ts
new file mode 100644
index 000000000..5cc44aaa8
--- /dev/null
+++ b/ext/node/polyfills/internal/crypto/_hex.ts
@@ -0,0 +1,19 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+// deno-fmt-ignore
+const hexTable = new Uint8Array([
+  48,  49,  50,  51, 52, 53,
+  54,  55,  56,  57, 97, 98,
+  99, 100, 101, 102
+]);
+
+/** Encodes `src` into `src.length * 2` bytes. */
+export function encode(src: Uint8Array): Uint8Array {
+  const dst = new Uint8Array(src.length * 2);
+  for (let i = 0; i < dst.length; i++) {
+    const v = src[i];
+    dst[i * 2] = hexTable[v >> 4];
+    dst[i * 2 + 1] = hexTable[v & 0x0f];
+  }
+  return dst;
+}