From 0ff74cf32464676a1ef57391a76dc956348b217d Mon Sep 17 00:00:00 2001
From: Patricio Palladino <email@patriciopalladino.com>
Date: Sun, 10 May 2020 10:54:23 -0300
Subject: [PATCH] Use ethereum-cryptography

---
 packages/buidler-core/package.json                    |  3 +--
 .../buidler-core/src/internal/util/keys-derivation.ts | 11 ++++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/packages/buidler-core/package.json b/packages/buidler-core/package.json
index 310c585956..ea6ec9fc49 100644
--- a/packages/buidler-core/package.json
+++ b/packages/buidler-core/package.json
@@ -77,8 +77,6 @@
     "@types/lru-cache": "^5.1.0",
     "abort-controller": "^3.0.0",
     "ansi-escapes": "^4.3.0",
-    "bip32": "^2.0.3",
-    "bip39": "^3.0.2",
     "chalk": "^2.4.2",
     "ci-info": "^2.0.0",
     "debug": "^4.1.1",
@@ -86,6 +84,7 @@
     "download": "^7.1.0",
     "enquirer": "^2.3.0",
     "eth-sig-util": "^2.5.2",
+    "ethereum-cryptography": "^0.1.2",
     "ethereumjs-abi": "^0.6.8",
     "ethereumjs-account": "^3.0.0",
     "ethereumjs-block": "^2.2.0",
diff --git a/packages/buidler-core/src/internal/util/keys-derivation.ts b/packages/buidler-core/src/internal/util/keys-derivation.ts
index 15a4fe6b06..1c4180b943 100644
--- a/packages/buidler-core/src/internal/util/keys-derivation.ts
+++ b/packages/buidler-core/src/internal/util/keys-derivation.ts
@@ -1,13 +1,14 @@
-import { fromSeed } from "bip32";
-import { mnemonicToSeedSync } from "bip39";
+import { mnemonicToSeedSync } from "ethereum-cryptography/bip39";
+import { HDKey } from "ethereum-cryptography/hdkey";
 
 export function deriveKeyFromMnemonicAndPath(
   mnemonic: string,
   hdPath: string
 ): Buffer | undefined {
   const seed = mnemonicToSeedSync(mnemonic);
-  const masterKey = fromSeed(seed);
-  const derived = masterKey.derivePath(hdPath);
 
-  return derived.privateKey;
+  const masterKey = HDKey.fromMasterSeed(seed);
+  const derived = masterKey.derive(hdPath);
+
+  return derived.privateKey === null ? undefined : derived.privateKey;
 }