include node_modules so release .zip is deployable

node_modules/nostr-tools/lib/esm/nip44.js

@@ -0,0 +1,105 @@
+// nip44.ts
+import { chacha20 } from "@noble/ciphers/chacha";
+import { ensureBytes, equalBytes } from "@noble/ciphers/utils";
+import { secp256k1 } from "@noble/curves/secp256k1";
+import { hkdf } from "@noble/hashes/hkdf";
+import { hmac } from "@noble/hashes/hmac";
+import { sha256 } from "@noble/hashes/sha256";
+import { concatBytes, randomBytes } from "@noble/hashes/utils";
+import { base64 } from "@scure/base";
+
+// utils.ts
+var utf8Decoder = new TextDecoder("utf-8");
+var utf8Encoder = new TextEncoder();
+
+// nip44.ts
+var utils = {
+  v2: {
+    maxPlaintextSize: 65536 - 128,
+    minCiphertextSize: 100,
+    maxCiphertextSize: 102400,
+    getConversationKey(privkeyA, pubkeyB) {
+      const key = secp256k1.getSharedSecret(privkeyA, "02" + pubkeyB);
+      return key.subarray(1, 33);
+    },
+    getMessageKeys(conversationKey, salt) {
+      const keys = hkdf(sha256, conversationKey, salt, "nip44-v2", 76);
+      return {
+        encryption: keys.subarray(0, 32),
+        nonce: keys.subarray(32, 44),
+        auth: keys.subarray(44, 76)
+      };
+    },
+    calcPadding(len) {
+      if (!Number.isSafeInteger(len) || len < 0)
+        throw new Error("expected positive integer");
+      if (len <= 32)
+        return 32;
+      const nextpower = 1 << Math.floor(Math.log2(len - 1)) + 1;
+      const chunk = nextpower <= 256 ? 32 : nextpower / 8;
+      return chunk * (Math.floor((len - 1) / chunk) + 1);
+    },
+    pad(unpadded) {
+      const unpaddedB = utf8Encoder.encode(unpadded);
+      const len = unpaddedB.length;
+      if (len < 1 || len >= utils.v2.maxPlaintextSize)
+        throw new Error("invalid plaintext length: must be between 1b and 64KB");
+      const paddedLen = utils.v2.calcPadding(len);
+      const zeros = new Uint8Array(paddedLen - len);
+      const lenBuf = new Uint8Array(2);
+      new DataView(lenBuf.buffer).setUint16(0, len);
+      return concatBytes(lenBuf, unpaddedB, zeros);
+    },
+    unpad(padded) {
+      const unpaddedLen = new DataView(padded.buffer).getUint16(0);
+      const unpadded = padded.subarray(2, 2 + unpaddedLen);
+      if (unpaddedLen === 0 || unpadded.length !== unpaddedLen || padded.length !== 2 + utils.v2.calcPadding(unpaddedLen))
+        throw new Error("invalid padding");
+      return utf8Decoder.decode(unpadded);
+    }
+  }
+};
+function encrypt(key, plaintext, options = {}) {
+  const version = options.version ?? 2;
+  if (version !== 2)
+    throw new Error("unknown encryption version " + version);
+  const salt = options.salt ?? randomBytes(32);
+  ensureBytes(salt, 32);
+  const keys = utils.v2.getMessageKeys(key, salt);
+  const padded = utils.v2.pad(plaintext);
+  const ciphertext = chacha20(keys.encryption, keys.nonce, padded);
+  const mac = hmac(sha256, keys.auth, ciphertext);
+  return base64.encode(concatBytes(new Uint8Array([version]), salt, ciphertext, mac));
+}
+function decrypt(key, ciphertext) {
+  const u = utils.v2;
+  ensureBytes(key, 32);
+  const clen = ciphertext.length;
+  if (clen < u.minCiphertextSize || clen >= u.maxCiphertextSize)
+    throw new Error("invalid ciphertext length: " + clen);
+  if (ciphertext[0] === "#")
+    throw new Error("unknown encryption version");
+  let data;
+  try {
+    data = base64.decode(ciphertext);
+  } catch (error) {
+    throw new Error("invalid base64: " + error.message);
+  }
+  const vers = data.subarray(0, 1)[0];
+  if (vers !== 2)
+    throw new Error("unknown encryption version " + vers);
+  const salt = data.subarray(1, 33);
+  const ciphertext_ = data.subarray(33, -32);
+  const mac = data.subarray(-32);
+  const keys = u.getMessageKeys(key, salt);
+  const calculatedMac = hmac(sha256, keys.auth, ciphertext_);
+  if (!equalBytes(calculatedMac, mac))
+    throw new Error("invalid MAC");
+  const padded = chacha20(keys.encryption, keys.nonce, ciphertext_);
+  return u.unpad(padded);
+}
+export {
+  decrypt,
+  encrypt,
+  utils
+};