nip04 string key is actually x and y, so we must get only 32 bytes of x.

nip04.js

@@ -5,7 +5,7 @@ import * as secp256k1 from '@noble/secp256k1'
 
 export function encrypt(privkey, pubkey, text) {
   const key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
-  const normalizedKey = getOnlyXFromFullSharedSecret(key)
+  const normalizedKey = getNormalizedX(key)
 
   let iv = Uint8Array.from(randomBytes(16))
   var cipher = aes.createCipheriv(
@@ -16,24 +16,27 @@ export function encrypt(privkey, pubkey, text) {
   let encryptedMessage = cipher.update(text, 'utf8', 'base64')
   encryptedMessage += cipher.final('base64')
 
-  return [encryptedMessage, Buffer.from(iv.buffer).toString('base64')]
+  return `${encryptedMessage}?iv=${Buffer.from(iv.buffer).toString('base64')}`
 }
 
-export function decrypt(privkey, pubkey, ciphertext, iv) {
-  const key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
-  const normalizedKey = getOnlyXFromFullSharedSecret(key)
+export function decrypt(privkey, pubkey, ciphertext) {
+  let [cip, iv] = ciphertext.split('?iv=')
+  let key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
+  let normalizedKey = getNormalizedX(key)
 
   var decipher = aes.createDecipheriv(
     'aes-256-cbc',
     Buffer.from(normalizedKey, 'hex'),
     Buffer.from(iv, 'base64')
   )
-  let decryptedMessage = decipher.update(ciphertext, 'base64')
+  let decryptedMessage = decipher.update(cip, 'base64')
   decryptedMessage += decipher.final('utf8')
 
   return decryptedMessage
 }
 
-function getOnlyXFromFullSharedSecret(fullSharedSecretCoordinates) {
-  return fullSharedSecretCoordinates.substr(2, 64)
+function getNormalizedX(key) {
+  return typeof key === 'string'
+    ? key.substr(2, 64)
+    : Buffer.from(key.slice(1)).toString('hex')
 }

nip05.js

@@ -15,6 +15,12 @@ export async function searchDomain(domain, query = '') {
 export async function queryName(fullname) {
   try {
     let [name, domain] = fullname.split('@')
+
+    if (!domain) {
+      domain = name
+      name = '_'
+    }
+
     let res = await (
       await fetch(`https://${domain}/.well-known/nostr.json?name=${name}`)
     ).json()

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "0.20.0",
+  "version": "0.21.3",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",