bump eth-sig-util version to 5.0.2, stop inheriting from `eth-simpl…

…e-keyring` (#70)

* remove inheritance of eth-simple-keyring

index.js

@@ -1,18 +1,33 @@
 const { hdkey } = require('ethereumjs-wallet');
-const SimpleKeyring = require('@metamask/eth-simple-keyring');
+const { keccak256 } = require('ethereum-cryptography/keccak');
+const {
+  stripHexPrefix,
+  privateToPublic,
+  publicToAddress,
+  ecsign,
+  arrToBufArr,
+} = require('@ethereumjs/util');
 const bip39 = require('@metamask/scure-bip39');
 const { wordlist } = require('@metamask/scure-bip39/dist/wordlists/english');
-const { normalize } = require('@metamask/eth-sig-util');
+const {
+  concatSig,
+  decrypt,
+  getEncryptionPublicKey,
+  normalize,
+  personalSign,
+  signTypedData,
+  SignTypedDataVersion,
+} = require('@metamask/eth-sig-util');
 
 // Options:
 const hdPathString = `m/44'/60'/0'/0`;
 const type = 'HD Key Tree';
 
-class HdKeyring extends SimpleKeyring {
+class HdKeyring {
   /* PUBLIC METHODS */
   constructor(opts = {}) {
-    super();
     this.type = type;
+    this._wallets = [];
     this.deserialize(opts);
   }
 
@@ -126,7 +141,130 @@ class HdKeyring extends SimpleKeyring {
     );
   }
 
-  /* PRIVATE METHODS */
+  /* BASE KEYRING METHODS */
+
+  // returns an address specific to an app
+  async getAppKeyAddress(address, origin) {
+    if (!origin || typeof origin !== 'string') {
+      throw new Error(`'origin' must be a non-empty string`);
+    }
+    const wallet = this._getWalletForAccount(address, {
+      withAppKeyOrigin: origin,
+    });
+    const appKeyAddress = normalize(
+      publicToAddress(wallet.publicKey).toString('hex'),
+    );
+    return appKeyAddress;
+  }
+
+  // exportAccount should return a hex-encoded private key:
+  async exportAccount(address, opts = {}) {
+    const wallet = this._getWalletForAccount(address, opts);
+    return wallet.privateKey.toString('hex');
+  }
+
+  // tx is an instance of the ethereumjs-transaction class.
+  async signTransaction(address, tx, opts = {}) {
+    const privKey = this._getPrivateKeyFor(address, opts);
+    const signedTx = tx.sign(privKey);
+    // Newer versions of Ethereumjs-tx are immutable and return a new tx object
+    return signedTx === undefined ? tx : signedTx;
+  }
+
+  // For eth_sign, we need to sign arbitrary data:
+  async signMessage(address, data, opts = {}) {
+    const message = stripHexPrefix(data);
+    const privKey = this._getPrivateKeyFor(address, opts);
+    const msgSig = ecsign(Buffer.from(message, 'hex'), privKey);
+    const rawMsgSig = concatSig(msgSig.v, msgSig.r, msgSig.s);
+    return rawMsgSig;
+  }
+
+  // For personal_sign, we need to prefix the message:
+  async signPersonalMessage(address, msgHex, opts = {}) {
+    const privKey = this._getPrivateKeyFor(address, opts);
+    const privateKey = Buffer.from(privKey, 'hex');
+    const sig = personalSign({ privateKey, data: msgHex });
+    return sig;
+  }
+
+  // For eth_decryptMessage:
+  async decryptMessage(withAccount, encryptedData) {
+    const wallet = this._getWalletForAccount(withAccount);
+    const { privateKey } = wallet;
+    const sig = decrypt({ privateKey, encryptedData });
+    return sig;
+  }
+
+  // personal_signTypedData, signs data along with the schema
+  async signTypedData(
+    withAccount,
+    typedData,
+    opts = { version: SignTypedDataVersion.V1 },
+  ) {
+    // Treat invalid versions as "V1"
+    const version = Object.keys(SignTypedDataVersion).includes(opts.version)
+      ? opts.version
+      : SignTypedDataVersion.V1;
+
+    const privateKey = this._getPrivateKeyFor(withAccount, opts);
+    return signTypedData({ privateKey, data: typedData, version });
+  }
+
+  removeAccount(address) {
+    if (
+      !this._wallets
+        .map((w) => normalize(w.getAddress().toString('hex')))
+        .includes(address.toLowerCase())
+    ) {
+      throw new Error(`Address ${address} not found in this keyring`);
+    }
+
+    this._wallets = this._wallets.filter(
+      (w) =>
+        normalize(w.getAddress().toString('hex')) !== address.toLowerCase(),
+    );
+  }
+
+  // get public key for nacl
+  async getEncryptionPublicKey(withAccount, opts = {}) {
+    const privKey = this._getPrivateKeyFor(withAccount, opts);
+    const publicKey = getEncryptionPublicKey(privKey);
+    return publicKey;
+  }
+
+  _getPrivateKeyFor(address, opts = {}) {
+    if (!address) {
+      throw new Error('Must specify address.');
+    }
+    const wallet = this._getWalletForAccount(address, opts);
+    return wallet.privateKey;
+  }
+
+  _getWalletForAccount(account, opts = {}) {
+    const address = normalize(account);
+    let wallet = this._wallets.find((w) => {
+      return (
+        normalize(w.getAddress().toString('hex')) === address.toLowerCase()
+      );
+    });
+    if (!wallet) {
+      throw new Error('HD Keyring - Unable to find matching address.');
+    }
+
+    if (opts.withAppKeyOrigin) {
+      const { privateKey } = wallet;
+      const appKeyOriginBuffer = Buffer.from(opts.withAppKeyOrigin, 'utf8');
+      const appKeyBuffer = Buffer.concat([privateKey, appKeyOriginBuffer]);
+      const appKeyPrivateKey = arrToBufArr(keccak256(appKeyBuffer, 256));
+      const appKeyPublicKey = privateToPublic(appKeyPrivateKey);
+      wallet = { privateKey: appKeyPrivateKey, publicKey: appKeyPublicKey };
+    }
+
+    return wallet;
+  }
+
+  /* PRIVATE / UTILITY METHODS */
 
   /**
    * Sets appropriate properties for the keyring based on the given

package.json

@@ -26,13 +26,14 @@
     "test": "jest"
   },
   "dependencies": {
-    "@metamask/eth-sig-util": "^4.0.0",
-    "@metamask/eth-simple-keyring": "^5.0.0",
+    "@ethereumjs/util": "^8.0.2",
+    "@metamask/eth-sig-util": "^5.0.2",
     "@metamask/scure-bip39": "^2.0.3",
+    "ethereum-cryptography": "^1.1.2",
     "ethereumjs-wallet": "^1.0.1"
   },
   "devDependencies": {
-    "@ethereumjs/util": "^8.0.0-beta.3",
+    "@ethereumjs/tx": "^4.0.1",
     "@lavamoat/allow-scripts": "^1.0.6",
     "@metamask/auto-changelog": "^2.5.0",
     "@metamask/bip39": "^4.0.0",