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packages/auth/src/modules/Signer.ts

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+import { NDKPrivateKeySigner, NDKUser } from '@nostr-dev-kit/ndk';
+import { Nip44 } from '../utils/nip44';
+import { getPublicKey } from 'nostr-tools';
+
+export class PrivateKeySigner extends NDKPrivateKeySigner {
+  private nip44: Nip44 = new Nip44();
+  private _pubkey: string;
+
+  constructor(privateKey: string) {
+    super(privateKey);
+    this._pubkey = getPublicKey(privateKey);
+  }
+
+  get pubkey() {
+    return this._pubkey;
+  }
+
+  encryptNip44(recipient: NDKUser, value: string): Promise<string> {
+    return Promise.resolve(this.nip44.encrypt(this.privateKey!, recipient.pubkey, value));
+  }
+
+  decryptNip44(sender: NDKUser, value: string): Promise<string> {
+    return Promise.resolve(this.nip44.decrypt(this.privateKey!, sender.pubkey, value));
+  }
+}