feat: hash and sign schnorr function

src/app/screens/Nostr/ConfirmSignSchnorr.tsx

@@ -23,7 +23,8 @@ function ConfirmSignSchnorr() {
   const { t: tPermissions } = useTranslation("permissions");
   const navigate = useNavigate();
 
-  const sigHash = navState.args?.sigHash as string;
+  const sigHash = navState.args?.sigHash as string | undefined;
+  const plaintext = navState.args?.message as string | undefined;
   const origin = navState.origin as OriginData;
   const [loading, setLoading] = useState(false);
   const [successMessage, setSuccessMessage] = useState("");
@@ -98,7 +99,7 @@ function ConfirmSignSchnorr() {
                   publisher: origin.host,
                   action: tPermissions("nostr.signschnorr.title"),
                 })}
-                content={sigHash}
+                content={plaintext || sigHash || ""}
               />
             </div>
             <div className="flex flex-col gap-4">

src/extension/background-script/actions/nostr/signSchnorrOrPrompt.ts

@@ -23,21 +23,23 @@ const signSchnorrOrPrompt = async (
 
   const nostr = await state.getState().getNostr();
   const sigHash = message.args.sigHash;
+  const plaintext = message.args.message;
+
+  const isMessageMode = !!plaintext;
 
   try {
-    if (!sigHash || typeof sigHash !== "string") {
+    if (!isMessageMode && (!sigHash || typeof sigHash !== "string")) {
       throw new Error("sigHash is missing or not correct");
     }
+    if (isMessageMode && typeof plaintext !== "string") {
+      throw new Error("message is missing or not correct");
+    }
+
+    const permissionMethod = PermissionMethodNostr["NOSTR_SIGNSCHNORR"];
 
-    const hasPermission = await hasPermissionFor(
-      PermissionMethodNostr["NOSTR_SIGNSCHNORR"],
-      host
-    );
+    const hasPermission = await hasPermissionFor(permissionMethod, host);
 
-    const isBlocked = await isPermissionBlocked(
-      PermissionMethodNostr["NOSTR_SIGNSCHNORR"],
-      host
-    );
+    const isBlocked = await isPermissionBlocked(permissionMethod, host);
 
     if (isBlocked) {
       return { denied: true };
@@ -55,10 +57,9 @@ const signSchnorrOrPrompt = async (
         action: "public/nostr/confirmSignSchnorr",
       });
 
-      // add permission to db only if user decided to always allow this request
       if (promptResponse.data.permissionOption == DONT_ASK_CURRENT) {
         await addPermissionFor(
-          PermissionMethodNostr["NOSTR_SIGNSCHNORR"],
+          permissionMethod,
           host,
           promptResponse.data.blocked
         );
@@ -84,7 +85,13 @@ const signSchnorrOrPrompt = async (
   }
 
   async function signSchnorr() {
-    const signedSchnorr = await nostr.signSchnorr(sigHash);
+    let signedSchnorr: string;
+
+    if (isMessageMode) {
+      signedSchnorr = await nostr.signSchnorrMessage(plaintext as string);
+    } else {
+      signedSchnorr = await nostr.signSchnorr(sigHash as string);
+    }
 
     return { data: signedSchnorr };
   }

src/extension/background-script/nostr/index.ts

@@ -53,6 +53,19 @@ class Nostr {
     return signedHex;
   }
 
+  async signSchnorrMessage(message: string): Promise<string> {
+    const encoder = new TextEncoder();
+    const data = encoder.encode(message);
+    const hashBuffer = await crypto.subtle.digest("SHA-256", data);
+    const hashArray = new Uint8Array(hashBuffer);
+
+    const signature = await schnorr.sign(
+      hashArray,
+      secp256k1.etc.hexToBytes(this.privateKey)
+    );
+    return secp256k1.etc.bytesToHex(signature);
+  }
+
   nip04Encrypt(pubkey: string, text: string) {
     const key = secp256k1.getSharedSecret(this.privateKey, "02" + pubkey);
     const normalizedKey = Buffer.from(key.slice(1, 33));

src/extension/providers/nostr/index.ts

@@ -26,6 +26,11 @@ export default class NostrProvider extends ProviderBase {
     return this.execute("signEventOrPrompt", { event });
   }
 
+  async signSchnorrMessage(message: string) {
+    await this.enable();
+    return this.execute("signSchnorrOrPrompt", { message });
+  }
+
   async signSchnorr(sigHash: string) {
     await this.enable();
     return this.execute("signSchnorrOrPrompt", { sigHash });

src/types.ts

@@ -561,7 +561,8 @@ export interface MessageSignEvent extends MessageDefault {
 
 export interface MessageSignSchnorr extends MessageDefault {
   args: {
-    sigHash: string;
+    sigHash?: string;
+    message?: string;
   };
   action: "signSchnorr";
 }