sign message in javascript

index.tsx
// Generate a new RSA key pair
crypto.subtle.generateKey(
   {
       name: "RSASSA-PKCS1-v1_5",
       modulusLength: 2048,
       publicExponent: new Uint8Array([0x01, 0x00, 0x01]),
       hash: "SHA-256",
   },
   true,
   ["sign", "verify"]
)
.then((keyPair) => {
    // Convert the message and private key to ArrayBuffer
    const message = new TextEncoder().encode("Hello, world!");
    const privateKey = keyPair.privateKey;

    // Sign the message using the private key
    crypto.subtle.sign(
       {
           name: "RSASSA-PKCS1-v1_5",
       },
       privateKey,
       message
    )
    .then((signature) => {
        // `signature` is an ArrayBuffer containing the signature
        console.log(new Uint8Array(signature));
    })
    .catch((error) => {
        console.error("Error signing the message:", error);
    });
})
.catch((error) => {
    console.error("Error generating key pair:", error);
});
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