// nip04.ts
import { randomBytes } from "@noble/hashes/utils";
import { secp256k1 } from "@noble/curves/secp256k1";
import { base64 } from "@scure/base";

// utils.ts
var utf8Decoder = new TextDecoder("utf-8");
var utf8Encoder = new TextEncoder();

// nip04.ts
if (typeof crypto !== "undefined" && !crypto.subtle && crypto.webcrypto) {
  crypto.subtle = crypto.webcrypto.subtle;
}
async function encrypt(privkey, pubkey, text) {
  const key = secp256k1.getSharedSecret(privkey, "02" + pubkey);
  const normalizedKey = getNormalizedX(key);
  let iv = Uint8Array.from(randomBytes(16));
  let plaintext = utf8Encoder.encode(text);
  let cryptoKey = await crypto.subtle.importKey("raw", normalizedKey, { name: "AES-CBC" }, false, ["encrypt"]);
  let ciphertext = await crypto.subtle.encrypt({ name: "AES-CBC", iv }, cryptoKey, plaintext);
  let ctb64 = base64.encode(new Uint8Array(ciphertext));
  let ivb64 = base64.encode(new Uint8Array(iv.buffer));
  return `${ctb64}?iv=${ivb64}`;
}
async function decrypt(privkey, pubkey, data) {
  let [ctb64, ivb64] = data.split("?iv=");
  let key = secp256k1.getSharedSecret(privkey, "02" + pubkey);
  let normalizedKey = getNormalizedX(key);
  let cryptoKey = await crypto.subtle.importKey("raw", normalizedKey, { name: "AES-CBC" }, false, ["decrypt"]);
  let ciphertext = base64.decode(ctb64);
  let iv = base64.decode(ivb64);
  let plaintext = await crypto.subtle.decrypt({ name: "AES-CBC", iv }, cryptoKey, ciphertext);
  let text = utf8Decoder.decode(plaintext);
  return text;
}
function getNormalizedX(key) {
  return key.slice(1, 33);
}
export {
  decrypt,
  encrypt
};