fix: multi-repo local dev (file:../ deps, package exports, missing deps)

node_modules/noise-curve-ed/index.js

@@ -0,0 +1,71 @@
+/* eslint-disable camelcase */
+const sodium = require('sodium-universal')
+const assert = require('nanoassert')
+const b4a = require('b4a')
+
+const DHLEN = sodium.crypto_scalarmult_ed25519_BYTES
+const PKLEN = sodium.crypto_scalarmult_ed25519_BYTES
+const SCALARLEN = sodium.crypto_scalarmult_ed25519_BYTES
+const SKLEN = sodium.crypto_sign_SECRETKEYBYTES
+const ALG = 'Ed25519'
+
+module.exports = {
+  DHLEN,
+  PKLEN,
+  SCALARLEN,
+  SKLEN,
+  ALG,
+  name: ALG,
+  generateKeyPair,
+  dh
+}
+
+function generateKeyPair (privKey) {
+  if (privKey) return generateSeedKeyPair(privKey.subarray(0, 32))
+
+  const keyPair = {}
+  keyPair.secretKey = b4a.alloc(SKLEN)
+  keyPair.publicKey = b4a.alloc(PKLEN)
+
+  sodium.crypto_sign_keypair(keyPair.publicKey, keyPair.secretKey)
+  return keyPair
+}
+
+function generateSeedKeyPair (seed) {
+  const keyPair = {}
+  keyPair.secretKey = b4a.alloc(SKLEN)
+  keyPair.publicKey = b4a.alloc(PKLEN)
+
+  sodium.crypto_sign_seed_keypair(keyPair.publicKey, keyPair.secretKey, seed)
+  return keyPair
+}
+
+function dh (publicKey, { scalar, secretKey }) {
+  // tweaked keys expose scalar directly
+  if (!scalar) {
+    assert(secretKey.byteLength === SKLEN)
+
+    // libsodium stores seed not actual scalar
+    const sk = b4a.alloc(64)
+    sodium.crypto_hash_sha512(sk, secretKey.subarray(0, 32))
+    sk[0] &= 248
+    sk[31] &= 127
+    sk[31] |= 64
+
+    scalar = sk.subarray(0, 32)
+  }
+
+  assert(scalar.byteLength === SCALARLEN)
+  assert(publicKey.byteLength === PKLEN)
+
+  const output = b4a.alloc(DHLEN)
+
+  // we clamp if necessary above
+  sodium.crypto_scalarmult_ed25519_noclamp(
+    output,
+    scalar,
+    publicKey
+  )
+
+  return output
+}