Use hex-identifiers directly

contracts/mocks/FeeManagerMock.sol

@@ -12,7 +12,7 @@ contract FeeManagerMock is BaseFeeManager {
     }
 
     function getFeeManagerMode() external pure returns (bytes4) {
-        return bytes4(keccak256(abi.encodePacked("manages-one-direction")));
+        return 0xf2aed8f7; // "manages-one-direction"
     }
 
     function randomTest(uint256 _count) external view returns (uint256) {

contracts/upgradeable_contracts/BaseBridgeValidators.sol

@@ -9,8 +9,8 @@ contract BaseBridgeValidators is Initializable, Ownable {
 
     address public constant F_ADDR = 0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF;
     uint256 internal constant MAX_VALIDATORS = 100;
-    bytes32 internal constant REQUIRED_SIGNATURES = keccak256(abi.encodePacked("requiredSignatures"));
-    bytes32 internal constant VALIDATOR_COUNT = keccak256(abi.encodePacked("validatorCount"));
+    bytes32 internal constant REQUIRED_SIGNATURES = 0xd18ea17c351d6834a0e568067fb71804d2a588d5e26d60f792b1c724b1bd53b1; // "requiredSignatures"
+    bytes32 internal constant VALIDATOR_COUNT = 0x8656d603d9f985c3483946a92789d52202f49736384ba131cb92f62c4c1aa082; // "validatorCount"
 
     event ValidatorAdded(address indexed validator);
     event ValidatorRemoved(address indexed validator);

contracts/upgradeable_contracts/BaseFeeManager.sol

@@ -13,8 +13,8 @@ contract BaseFeeManager is EternalStorage, FeeTypes {
 
     // This is not a real fee value but a relative value used to calculate the fee percentage
     uint256 internal constant MAX_FEE = 1 ether;
-    bytes32 internal constant HOME_FEE_STORAGE_KEY = keccak256(abi.encodePacked("homeFee"));
-    bytes32 internal constant FOREIGN_FEE_STORAGE_KEY = keccak256(abi.encodePacked("foreignFee"));
+    bytes32 internal constant HOME_FEE_STORAGE_KEY = 0xc3781f3cec62d28f56efe98358f59c2105504b194242dbcb2cc0806850c306e7; // "homeFee"
+    bytes32 internal constant FOREIGN_FEE_STORAGE_KEY = 0x68c305f6c823f4d2fa4140f9cf28d32a1faccf9b8081ff1c2de11cf32c733efc; // "foreignFee"
 
     function calculateFee(uint256 _value, bool _recover, bytes32 _feeType) public view returns (uint256) {
         uint256 fee = _feeType == HOME_FEE ? getHomeFee() : getForeignFee();

contracts/upgradeable_contracts/BaseOverdrawManagement.sol

@@ -6,7 +6,7 @@ contract BaseOverdrawManagement is EternalStorage {
     event AmountLimitExceeded(address recipient, uint256 value, bytes32 transactionHash);
     event AssetAboveLimitsFixed(bytes32 indexed transactionHash, uint256 value, uint256 remaining);
 
-    bytes32 internal constant OUT_OF_LIMIT_AMOUNT = keccak256(abi.encodePacked("outOfLimitAmount"));
+    bytes32 internal constant OUT_OF_LIMIT_AMOUNT = 0x145286dc85799b6fb9fe322391ba2d95683077b2adf34dd576dedc437e537ba7; // "outOfLimitAmount"
 
     function outOfLimitAmount() public view returns (uint256) {
         return uintStorage[OUT_OF_LIMIT_AMOUNT];

contracts/upgradeable_contracts/BasicBridge.sol

@@ -12,8 +12,8 @@ contract BasicBridge is Initializable, Validatable, Ownable, Upgradeable, Claima
     event GasPriceChanged(uint256 gasPrice);
     event RequiredBlockConfirmationChanged(uint256 requiredBlockConfirmations);
 
-    bytes32 internal constant GAS_PRICE = keccak256(abi.encodePacked("gasPrice"));
-    bytes32 internal constant REQUIRED_BLOCK_CONFIRMATIONS = keccak256(abi.encodePacked("requiredBlockConfirmations"));
+    bytes32 internal constant GAS_PRICE = 0x55b3774520b5993024893d303890baa4e84b1244a43c60034d1ced2d3cf2b04b; // "gasPrice"
+    bytes32 internal constant REQUIRED_BLOCK_CONFIRMATIONS = 0x916daedf6915000ff68ced2f0b6773fe6f2582237f92c3c95bb4d79407230071; // "requiredBlockConfirmations"
 
     function setGasPrice(uint256 _gasPrice) external onlyOwner {
         require(_gasPrice > 0);

contracts/upgradeable_contracts/BasicTokenBridge.sol

@@ -10,12 +10,12 @@ contract BasicTokenBridge is EternalStorage, Ownable {
     event DailyLimitChanged(uint256 newLimit);
     event ExecutionDailyLimitChanged(uint256 newLimit);
 
-    bytes32 internal constant MIN_PER_TX = keccak256(abi.encodePacked("minPerTx"));
-    bytes32 internal constant MAX_PER_TX = keccak256(abi.encodePacked("maxPerTx"));
-    bytes32 internal constant DAILY_LIMIT = keccak256(abi.encodePacked("dailyLimit"));
-    bytes32 internal constant EXECUTION_MAX_PER_TX = keccak256(abi.encodePacked("executionMaxPerTx"));
-    bytes32 internal constant EXECUTION_DAILY_LIMIT = keccak256(abi.encodePacked("executionDailyLimit"));
-    bytes32 internal constant DECIMAL_SHIFT = keccak256(abi.encodePacked("decimalShift"));
+    bytes32 internal constant MIN_PER_TX = 0xbbb088c505d18e049d114c7c91f11724e69c55ad6c5397e2b929e68b41fa05d1; // "minPerTx"
+    bytes32 internal constant MAX_PER_TX = 0x0f8803acad17c63ee38bf2de71e1888bc7a079a6f73658e274b08018bea4e29c; // "maxPerTx"
+    bytes32 internal constant DAILY_LIMIT = 0x4a6a899679f26b73530d8cf1001e83b6f7702e04b6fdb98f3c62dc7e47e041a5; // "dailyLimit"
+    bytes32 internal constant EXECUTION_MAX_PER_TX = 0xc0ed44c192c86d1cc1ba51340b032c2766b4a2b0041031de13c46dd7104888d5; // "executionMaxPerTx"
+    bytes32 internal constant EXECUTION_DAILY_LIMIT = 0x21dbcab260e413c20dc13c28b7db95e2b423d1135f42bb8b7d5214a92270d237; // "executionDailyLimit"
+    bytes32 internal constant DECIMAL_SHIFT = 0x1e8ecaafaddea96ed9ac6d2642dcdfe1bebe58a930b1085842d8fc122b371ee5; // "decimalShift"
 
     function totalSpentPerDay(uint256 _day) public view returns (uint256) {
         return uintStorage[keccak256(abi.encodePacked("totalSpentPerDay", _day))];

contracts/upgradeable_contracts/BlockRewardBridge.sol

@@ -5,7 +5,7 @@ import "../upgradeability/EternalStorage.sol";
 import "openzeppelin-solidity/contracts/AddressUtils.sol";
 
 contract BlockRewardBridge is EternalStorage {
-    bytes32 internal constant BLOCK_REWARD_CONTRACT = keccak256(abi.encodePacked("blockRewardContract"));
+    bytes32 internal constant BLOCK_REWARD_CONTRACT = 0x20ae0b8a761b32f3124efb075f427dd6ca669e88ae7747fec9fd1ad688699f32; // "blockRewardContract"
     bytes4 internal constant BLOCK_REWARD_CONTRACT_ID = 0x2ee57f8d; // blockRewardContractId()
     bytes4 internal constant BRIDGES_ALLOWED_LENGTH = 0x10f2ee7c; // bridgesAllowedLength()
 

contracts/upgradeable_contracts/ERC20Bridge.sol

@@ -5,7 +5,7 @@ import "openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol";
 import "openzeppelin-solidity/contracts/AddressUtils.sol";
 
 contract ERC20Bridge is EternalStorage {
-    bytes32 internal constant ERC20_TOKEN = keccak256(abi.encodePacked("erc20token"));
+    bytes32 internal constant ERC20_TOKEN = 0x15d63b18dbc21bf4438b7972d80076747e1d93c4f87552fe498c90cbde51665e; // "erc20token"
 
     function erc20token() public view returns (ERC20Basic) {
         return ERC20Basic(addressStorage[ERC20_TOKEN]);

contracts/upgradeable_contracts/ERC677Storage.sol

@@ -1,5 +1,5 @@
 pragma solidity 0.4.24;
 
 contract ERC677Storage {
-    bytes32 internal constant ERC677_TOKEN = keccak256(abi.encodePacked("erc677token"));
+    bytes32 internal constant ERC677_TOKEN = 0xa8b0ade3e2b734f043ce298aca4cc8d19d74270223f34531d0988b7d00cba21d; // "erc677token"
 }

contracts/upgradeable_contracts/FeeTypes.sol

@@ -1,6 +1,6 @@
 pragma solidity 0.4.24;
 
 contract FeeTypes {
-    bytes32 internal constant HOME_FEE = keccak256(abi.encodePacked("home-fee"));
-    bytes32 internal constant FOREIGN_FEE = keccak256(abi.encodePacked("foreign-fee"));
+    bytes32 internal constant HOME_FEE = 0x89d93e5e92f7e37e490c25f0e50f7f4aad7cc94b308a566553280967be38bcf1; // "home-fee"
+    bytes32 internal constant FOREIGN_FEE = 0xdeb7f3adca07d6d1f708c1774389db532a2b2f18fd05a62b957e4089f4696ed5; // "foreign-fee"
 }

contracts/upgradeable_contracts/Initializable.sol

@@ -3,8 +3,8 @@ pragma solidity 0.4.24;
 import "../upgradeability/EternalStorage.sol";
 
 contract Initializable is EternalStorage {
-    bytes32 internal constant INITIALIZED = keccak256(abi.encodePacked("isInitialized"));
-    bytes32 internal constant DEPLOYED_AT_BLOCK = keccak256(abi.encodePacked("deployedAtBlock"));
+    bytes32 internal constant INITIALIZED = 0x0a6f646cd611241d8073675e00d1a1ff700fbf1b53fcf473de56d1e6e4b714ba; // "isInitialized"
+    bytes32 internal constant DEPLOYED_AT_BLOCK = 0xb120ceec05576ad0c710bc6e85f1768535e27554458f05dcbb5c65b8c7a749b0; // "deployedAtBlock"
 
     function setInitialize() internal {
         boolStorage[INITIALIZED] = true;

contracts/upgradeable_contracts/Ownable.sol

@@ -23,12 +23,14 @@ contract Ownable is EternalStorage {
         _;
     }
 
+    bytes32 internal constant OWNER = 0x02016836a56b71f0d02689e69e326f4f4c1b9057164ef592671cf0d37c8040c0; // "owner"
+
     /**
     * @dev Tells the address of the owner
     * @return the address of the owner
     */
     function owner() public view returns (address) {
-        return addressStorage[keccak256(abi.encodePacked("owner"))];
+        return addressStorage[OWNER];
     }
 
     /**
@@ -45,6 +47,6 @@ contract Ownable is EternalStorage {
     */
     function setOwner(address newOwner) internal {
         emit OwnershipTransferred(owner(), newOwner);
-        addressStorage[keccak256(abi.encodePacked("owner"))] = newOwner;
+        addressStorage[OWNER] = newOwner;
     }
 }

contracts/upgradeable_contracts/ReentrancyGuard.sol

@@ -3,7 +3,7 @@ pragma solidity 0.4.24;
 import "../upgradeability/EternalStorage.sol";
 
 contract ReentrancyGuard is EternalStorage {
-    bytes32 internal constant LOCK = keccak256(abi.encodePacked("lock"));
+    bytes32 internal constant LOCK = 0x6168652c307c1e813ca11cfb3a601f1cf3b22452021a5052d8b05f1f1f8a3e92; // "lock"
 
     function lock() internal returns (bool) {
         return boolStorage[LOCK];

contracts/upgradeable_contracts/RewardableBridge.sol

@@ -8,7 +8,7 @@ contract RewardableBridge is Ownable, FeeTypes {
     event FeeDistributedFromAffirmation(uint256 feeAmount, bytes32 indexed transactionHash);
     event FeeDistributedFromSignatures(uint256 feeAmount, bytes32 indexed transactionHash);
 
-    bytes32 internal constant FEE_MANAGER_CONTRACT = keccak256(abi.encodePacked("feeManagerContract"));
+    bytes32 internal constant FEE_MANAGER_CONTRACT = 0x779a349c5bee7817f04c960f525ee3e2f2516078c38c68a3149787976ee837e5; // "feeManagerContract"
     bytes4 internal constant GET_HOME_FEE = 0x94da17cd; // getHomeFee()
     bytes4 internal constant GET_FOREIGN_FEE = 0xffd66196; // getForeignFee()
     bytes4 internal constant GET_FEE_MANAGER_MODE = 0xf2ba9561; // getFeeManagerMode()

contracts/upgradeable_contracts/ValidatorStorage.sol

@@ -1,5 +1,5 @@
 pragma solidity 0.4.24;
 
 contract ValidatorStorage {
-    bytes32 internal constant VALIDATOR_CONTRACT = keccak256(abi.encodePacked("validatorContract"));
+    bytes32 internal constant VALIDATOR_CONTRACT = 0x5a74bb7e202fb8e4bf311841c7d64ec19df195fee77d7e7ae749b27921b6ddfe; // "validatorContract"
 }

contracts/upgradeable_contracts/amb_erc677_to_erc677/BasicAMBErc677ToErc677.sol

@@ -24,10 +24,10 @@ contract BasicAMBErc677ToErc677 is
 {
     event FailedMessageFixed(bytes32 indexed dataHash, address recipient, uint256 value);
 
-    bytes32 internal constant BRIDGE_CONTRACT = keccak256(abi.encodePacked("bridgeContract"));
-    bytes32 internal constant MEDIATOR_CONTRACT = keccak256(abi.encodePacked("mediatorContract"));
-    bytes32 internal constant REQUEST_GAS_LIMIT = keccak256(abi.encodePacked("requestGasLimit"));
-    bytes32 internal constant NONCE = keccak256(abi.encodePacked("nonce"));
+    bytes32 internal constant BRIDGE_CONTRACT = 0x811bbb11e8899da471f0e69a3ed55090fc90215227fc5fb1cb0d6e962ea7b74f; // "bridgeContract"
+    bytes32 internal constant MEDIATOR_CONTRACT = 0x98aa806e31e94a687a31c65769cb99670064dd7f5a87526da075c5fb4eab9880; // "mediatorContract"
+    bytes32 internal constant REQUEST_GAS_LIMIT = 0x2dfd6c9f781bb6bbb5369c114e949b69ebb440ef3d4dd6b2836225eb1dc3a2be; // "requestGasLimit"
+    bytes32 internal constant NONCE = 0x7ab1577440dd7bedf920cb6de2f9fc6bf7ba98c78c85a3fa1f8311aac95e1759; // "nonce"
 
     function initialize(
         address _bridgeContract,
@@ -102,7 +102,7 @@ contract BasicAMBErc677ToErc677 is
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("erc-to-erc-amb")));
+        return 0x76595b56; // "erc-to-erc-amb"
     }
 
     function setBridgeContract(address _bridgeContract) external onlyOwner {

contracts/upgradeable_contracts/arbitrary_message/BasicAMB.sol

@@ -3,7 +3,7 @@ pragma solidity 0.4.24;
 import "../BasicBridge.sol";
 
 contract BasicAMB is BasicBridge {
-    bytes32 internal constant MAX_GAS_PER_TX = keccak256(abi.encodePacked("maxGasPerTx"));
+    bytes32 internal constant MAX_GAS_PER_TX = 0x2670ecc91ec356e32067fd27b36614132d727b84a1e03e08f412a4f2cf075974; // "maxGasPerTx"
 
     function initialize(
         address _validatorContract,
@@ -32,7 +32,7 @@ contract BasicAMB is BasicBridge {
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("arbitrary-message-bridge-core")));
+        return 0x2544fbb9; // "arbitrary-message-bridge-core"
     }
 
     function maxGasPerTx() public view returns (uint256) {

contracts/upgradeable_contracts/arbitrary_message/MessageProcessor.sol

@@ -4,8 +4,8 @@ import "../../upgradeability/EternalStorage.sol";
 import "../../libraries/Bytes.sol";
 
 contract MessageProcessor is EternalStorage {
-    bytes32 internal constant MESSAGE_SENDER = keccak256(abi.encodePacked("messageSender"));
-    bytes32 internal constant TRANSACTION_HASH = keccak256(abi.encodePacked("transactionHash"));
+    bytes32 internal constant MESSAGE_SENDER = 0x7b58b2a669d8e0992eae9eaef641092c0f686fd31070e7236865557fa1571b5b; // "messageSender"
+    bytes32 internal constant TRANSACTION_HASH = 0x7bce44346b9831b0c81437a092605c6fc51612016e2c51e62f21d829e434bcf6; // "transactionHash"
 
     function messageCallStatus(bytes32 _txHash) external view returns (bool) {
         return boolStorage[keccak256(abi.encodePacked("messageCallStatus", _txHash))];

contracts/upgradeable_contracts/erc20_to_erc20/BasicForeignBridgeErcToErc.sol

@@ -38,7 +38,7 @@ contract BasicForeignBridgeErcToErc is BasicForeignBridge {
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("erc-to-erc-core")));
+        return 0xba4690f5; // "erc-to-erc-core"
     }
 
     function claimTokens(address _token, address _to) public {

contracts/upgradeable_contracts/erc20_to_erc20/FeeManagerErcToErcPOSDAO.sol

@@ -4,7 +4,7 @@ import "../BlockRewardFeeManager.sol";
 
 contract FeeManagerErcToErcPOSDAO is BlockRewardFeeManager {
     function getFeeManagerMode() external pure returns (bytes4) {
-        return bytes4(keccak256(abi.encodePacked("manages-both-directions")));
+        return 0xd7de965f; // "manages-both-directions"
     }
 
     function blockRewardContract() external view returns (address) {

contracts/upgradeable_contracts/erc20_to_erc20/HomeBridgeErcToErc.sol

@@ -141,7 +141,7 @@ contract HomeBridgeErcToErc is
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("erc-to-erc-core")));
+        return 0xba4690f5; // "erc-to-erc-core"
     }
 
     function onExecuteAffirmation(address _recipient, uint256 _value, bytes32 txHash) internal returns (bool) {

contracts/upgradeable_contracts/erc20_to_native/FeeManagerErcToNative.sol

@@ -7,7 +7,7 @@ import "../BlockRewardBridge.sol";
 
 contract FeeManagerErcToNative is ValidatorsFeeManager, BlockRewardBridge {
     function getFeeManagerMode() external pure returns (bytes4) {
-        return bytes4(keccak256(abi.encodePacked("manages-both-directions")));
+        return 0xd7de965f; // "manages-both-directions"
     }
 
     function onAffirmationFeeDistribution(address _rewardAddress, uint256 _fee) internal {

contracts/upgradeable_contracts/erc20_to_native/FeeManagerErcToNativePOSDAO.sol

@@ -5,7 +5,7 @@ import "../BlockRewardFeeManager.sol";
 
 contract FeeManagerErcToNativePOSDAO is BlockRewardFeeManager {
     function getFeeManagerMode() external pure returns (bytes4) {
-        return bytes4(keccak256(abi.encodePacked("manages-both-directions")));
+        return 0xd7de965f; // "manages-both-directions"
     }
 
     function distributeFeeFromBlockReward(uint256 _fee) internal {

contracts/upgradeable_contracts/erc20_to_native/ForeignBridgeErcToNative.sol

@@ -42,7 +42,7 @@ contract ForeignBridgeErcToNative is BasicForeignBridge, ERC20Bridge {
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("erc-to-native-core")));
+        return 0x18762d46; // "erc-to-native-core"
     }
 
     function claimTokens(address _token, address _to) public {

contracts/upgradeable_contracts/erc20_to_native/HomeBridgeErcToNative.sol

@@ -16,7 +16,7 @@ contract HomeBridgeErcToNative is
     RewardableHomeBridgeErcToNative,
     BlockRewardBridge
 {
-    bytes32 internal constant TOTAL_BURNT_COINS = keccak256(abi.encodePacked("totalBurntCoins"));
+    bytes32 internal constant TOTAL_BURNT_COINS = 0x17f187b2e5d1f8770602b32c1159b85c9600859277fae1eaa9982e9bcf63384c; // "totalBurntCoins"
 
     function() public payable {
         nativeTransfer();
@@ -101,7 +101,7 @@ contract HomeBridgeErcToNative is
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("erc-to-native-core")));
+        return 0x18762d46; // "erc-to-native-core"
     }
 
     function blockRewardContract() public view returns (IBlockReward) {

contracts/upgradeable_contracts/native_to_erc20/FeeManagerNativeToErc.sol

@@ -7,7 +7,7 @@ import "../ERC677Storage.sol";
 
 contract FeeManagerNativeToErc is ValidatorsFeeManager, ERC677Storage {
     function getFeeManagerMode() external pure returns (bytes4) {
-        return bytes4(keccak256(abi.encodePacked("manages-one-direction")));
+        return 0xf2aed8f7; // "manages-one-direction"
     }
 
     function erc677token() public view returns (IBurnableMintableERC677Token) {

contracts/upgradeable_contracts/native_to_erc20/FeeManagerNativeToErcBothDirections.sol

@@ -5,7 +5,7 @@ import "../ValidatorsFeeManager.sol";
 
 contract FeeManagerNativeToErcBothDirections is ValidatorsFeeManager {
     function getFeeManagerMode() external pure returns (bytes4) {
-        return bytes4(keccak256(abi.encodePacked("manages-both-directions")));
+        return 0xd7de965f; // "manages-both-directions"
     }
 
     function onAffirmationFeeDistribution(address _rewardAddress, uint256 _fee) internal {

contracts/upgradeable_contracts/native_to_erc20/ForeignBridgeNativeToErc.sol

@@ -68,7 +68,7 @@ contract ForeignBridgeNativeToErc is
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("native-to-erc-core")));
+        return 0x92a8d7fe; // "native-to-erc-core"
     }
 
     function claimTokensFromErc677(address _token, address _to) external onlyIfUpgradeabilityOwner {

contracts/upgradeable_contracts/native_to_erc20/HomeBridgeNativeToErc.sol

@@ -76,7 +76,7 @@ contract HomeBridgeNativeToErc is EternalStorage, BasicHomeBridge, RewardableHom
     }
 
     function getBridgeMode() external pure returns (bytes4 _data) {
-        return bytes4(keccak256(abi.encodePacked("native-to-erc-core")));
+        return 0x92a8d7fe; // "native-to-erc-core"
     }
 
     function _initialize(