crypto: add KeyObject.asymmetricKeySize

Expose the size of asymetric keys of crypto key object from the
crypto module added in v11.6.0.

PR-URL: https://github.com/nodejs/node/pull/26387
Refs: https://github.com/nodejs/node/pull/24234
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/internal/crypto/keys.js b/lib/internal/crypto/keys.js
index 2e23d76671..15a359be96 100644
--- a/lib/internal/crypto/keys.js
+++ b/lib/internal/crypto/keys.js
@@ -73,9 +73,15 @@ class SecretKeyObject extends KeyObject {
   }
 }
 
+const kAsymmetricKeySize = Symbol('kAsymmetricKeySize');
 const kAsymmetricKeyType = Symbol('kAsymmetricKeyType');
 
 class AsymmetricKeyObject extends KeyObject {
+  get asymmetricKeySize() {
+    return this[kAsymmetricKeySize] ||
+           (this[kAsymmetricKeySize] = this[kHandle].getAsymmetricKeySize());
+  }
+
   get asymmetricKeyType() {
     return this[kAsymmetricKeyType] ||
            (this[kAsymmetricKeyType] = this[kHandle].getAsymmetricKeyType());