getStorageAt whitelist implementation.

go/common/enclave.go

@@ -86,6 +86,8 @@ type Enclave interface {
 	// GetCode returns the code stored at the given address in the state for the given rollup hash.
 	GetCode(ctx context.Context, address gethcommon.Address, rollupHash *gethcommon.Hash) ([]byte, SystemError)
 
+	GetStorageSlot(ctx context.Context, encryptedParams EncryptedParamsGetStorageSlot) (*responses.EnclaveResponse, SystemError)
+
 	// Subscribe adds a log subscription to the enclave under the given ID, provided the request is authenticated
 	// correctly. The events will be populated in the BlockSubmissionResponse. If there is an existing subscription
 	// with the given ID, it is overwritten.

go/common/privacy/whitelist.go

@@ -0,0 +1,28 @@
+package privacy
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+type Whitelist struct {
+	AllowedStorageSlots map[string]bool
+}
+
+func NewWhitelist() *Whitelist {
+	whitelistMap := make(map[string]bool)
+	whitelistMap[toEip1967HashHex("eip1967.proxy.beacon")] = true
+
+	return &Whitelist{
+		AllowedStorageSlots: whitelistMap,
+	}
+}
+
+func toEip1967HashHex(key string) string {
+	hash := crypto.Keccak256Hash([]byte(key))
+	hashAsbig := hash.Big()
+	eipHashHex := "0x" + hashAsbig.Sub(hashAsbig, big.NewInt(1)).Text(16)
+
+	return eipHashHex
+}