add private key to address function

packages/status-js/src/utils/private-key-to-address.test.ts

@@ -0,0 +1,10 @@
+import { privateKeyToAddress } from './private-key-to-address'
+
+describe('privateKeyToAddress', () => {
+  it('should return public address', () => {
+    const privateKey =
+      '0x348ce564d427a3311b6536bbcff9390d69395b06ed6c486954e971d960fe8709'
+    const address = privateKeyToAddress(privateKey)
+    expect(address).toEqual('0xb8CE9ab6943e0eCED004cDe8e3bBed6568B2Fa01')
+  })
+})

packages/status-js/src/utils/private-key-to-address.ts

@@ -0,0 +1,13 @@
+import { keccak256 } from 'ethereum-cryptography/keccak'
+import { getPublicKey } from 'ethereum-cryptography/secp256k1'
+import { bytesToHex } from 'ethereum-cryptography/utils'
+
+export function privateKeyToAddress(privateKey: string): string {
+  const publicKey = getPublicKey(privateKey)
+  const publicKeyWithoutPrefix = publicKey.slice(1) // uncompressed public key has 04 prefix
+  const hash = keccak256(publicKeyWithoutPrefix)
+  const address = bytesToHex(hash.slice(12))
+
+  // TODO: add checksum
+  return address
+}