fix(ext/node): initial `crypto.createPublicKey()` support (#22509)

Closes #21807

Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>

1 files changed, 20 insertions, 4 deletions

diff --git a/ext/node/polyfills/internal/crypto/keys.ts b/ext/node/polyfills/internal/crypto/keys.ts
index ab753582f..33034d824 100644
--- a/ext/node/polyfills/internal/crypto/keys.ts
+++ b/ext/node/polyfills/internal/crypto/keys.ts
@@ -4,7 +4,10 @@
 // TODO(petamoriken): enable prefer-primordials for node polyfills
 // deno-lint-ignore-file prefer-primordials
 
-import { op_node_create_private_key } from "ext:core/ops";
+import {
+  op_node_create_private_key,
+  op_node_create_public_key,
+} from "ext:core/ops";
 
 import {
   kHandle,
@@ -239,9 +242,12 @@ export function createPrivateKey(
 }
 
 export function createPublicKey(
-  _key: PublicKeyInput | string | Buffer | KeyObject | JsonWebKeyInput,
-): KeyObject {
-  notImplemented("crypto.createPublicKey");
+  key: PublicKeyInput | string | Buffer | JsonWebKeyInput,
+): PublicKeyObject {
+  const { data, format, type } = prepareAsymmetricKey(key);
+  const details = op_node_create_public_key(data, format, type);
+  const handle = setOwnedKey(copyBuffer(data));
+  return new PublicKeyObject(handle, details);
 }
 
 function getKeyTypes(allowKeyObject: boolean, bufferOnly = false) {
@@ -358,6 +364,16 @@ class PrivateKeyObject extends AsymmetricKeyObject {
   }
 }
 
+class PublicKeyObject extends AsymmetricKeyObject {
+  constructor(handle: unknown, details: unknown) {
+    super("public", handle, details);
+  }
+
+  export(_options: unknown) {
+    notImplemented("crypto.PublicKeyObject.prototype.export");
+  }
+}
+
 export function setOwnedKey(key: Uint8Array): unknown {
   const handle = {};
   KEY_STORE.set(handle, key);