Replace sha3 with keccak

sha3 wasn't faster than the pure js implementation, keccak is.

Author: alcuadrado

packages/ethereum-cryptography-native/package.json

@@ -43,9 +43,9 @@
   },
   "optionalDependencies": {
     "blake2": "^2.0.1",
+    "keccak": "^2.0.0",
     "scrypt": "^6.0.3",
-    "secp256k1": "^3.7.1",
-    "sha3": "^1.2.3"
+    "secp256k1": "^3.7.1"
   },
   "dependencies": {
     "@types/secp256k1": "^3.5.0"

packages/ethereum-cryptography-native/src/keccak.ts

@@ -1,25 +1,25 @@
-const SHA3 = require("sha3");
+const createKeccakHash = require("keccak");
 
 export function keccak224(msg: Buffer): Buffer {
-  const sha3 = new SHA3.SHA3Hash(224);
-  sha3.update(msg);
-  return Buffer.from(sha3.digest(), "binary");
+  const hash = createKeccakHash("keccak224");
+  hash.update(msg);
+  return Buffer.from(hash.digest(), "binary");
 }
 
 export function keccak256(msg: Buffer): Buffer {
-  const sha3 = new SHA3.SHA3Hash(256);
-  sha3.update(msg);
-  return Buffer.from(sha3.digest(), "binary");
+  const hash = createKeccakHash("keccak256");
+  hash.update(msg);
+  return Buffer.from(hash.digest(), "binary");
 }
 
 export function keccak384(msg: Buffer): Buffer {
-  const sha3 = new SHA3.SHA3Hash(384);
-  sha3.update(msg);
-  return Buffer.from(sha3.digest(), "binary");
+  const hash = createKeccakHash("keccak384");
+  hash.update(msg);
+  return Buffer.from(hash.digest(), "binary");
 }
 
 export function keccak512(msg: Buffer): Buffer {
-  const sha3 = new SHA3.SHA3Hash(512);
-  sha3.update(msg);
-  return Buffer.from(sha3.digest(), "binary");
+  const hash = createKeccakHash("keccak512");
+  hash.update(msg);
+  return Buffer.from(hash.digest(), "binary");
 }