Update AccountCreationAuth & fix auth.HashToSign

- Fix AccountCreationAuth.HashToSign (was using `[]byte("0x...")`, which
uses the bytes of the string. Now uses the bytearray of the compressed
BJJ public key (compatible with js implementation))
- Update AccountCreationAuth to last specification (add to hash
parameters ChainID & HermezAddress)
- Add missing test to AccountCreationAuth

test/l2db_test.go

@@ -3,13 +3,17 @@ package test
 import (
 	"testing"
 
+	ethCommon "github.com/ethereum/go-ethereum/common"
 	"github.com/stretchr/testify/assert"
 )
 
 func TestGenAuths(t *testing.T) {
+	chainID := uint16(0)
+	hermezContractAddr := ethCommon.HexToAddress("0xc344E203a046Da13b0B4467EB7B3629D0C99F6E6")
+
 	const nAuths = 5
-	auths := GenAuths(nAuths)
+	auths := GenAuths(nAuths, chainID, hermezContractAddr)
 	for _, auth := range auths {
-		assert.True(t, auth.VerifySignature())
+		assert.True(t, auth.VerifySignature(chainID, hermezContractAddr))
 	}
 }