1 files changed, 30 insertions, 0 deletions
diff --git a/src/lib/nostr.js b/src/lib/nostr.js
new file mode 100644
index 00000000..df63d5d8
--- /dev/null
+++ b/src/lib/nostr.js
@@ -0,0 +1,30 @@
+import { entropyToMnemonic, mnemonicToSeedSync } from 'bip39';
+import { Buffer } from 'buffer';
+import { bech32m } from 'bech32';
+import { bip32, post, stretch } from '$lib/utils';
+import { calculateId, signId } from 'nostr';
+
+const { decode, fromWords } = bech32m;
+
+export let send = async (event, { cipher, username, salt }, password) => {
+	let mnemonic, key, seed, entropy, child, privkey;
+	entropy = Buffer.from(
+		await crypto.subtle.decrypt(
+			{ name: 'AES-GCM', iv: new Uint8Array(16) },
+			await stretch(password, Buffer.from(salt, 'hex')),
+			Uint8Array.from(fromWords(decode(cipher, 180).words))
+		),
+		'hex'
+	).toString('hex');
+
+	mnemonic = entropyToMnemonic(entropy);
+	seed = mnemonicToSeedSync(mnemonic);
+	key = bip32.fromSeed(seed);
+	child = key.derivePath("m/44'/1237'/0'/0/0");
+	privkey = child.privateKey;
+
+	event.id = await calculateId(event);
+	event.sig = await signId(privkey, event.id);
+
+	await post(`/${username}`, { event });
+};