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authorAmir Bandeali <abandeali1@gmail.com>2018-08-09 04:48:31 +0800
committerGitHub <noreply@github.com>2018-08-09 04:48:31 +0800
commita6ccfaf9caf20cbc4969c0673cf0c83c33553e0a (patch)
tree22b847c74e8cf74ca627db10eaff1d1e7dcc4302
parent8199e8794331f555679496d32cb87ad8513c31d1 (diff)
parent149c07dfd2ef2e2102d66ebbdaf1268a1938f4af (diff)
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Merge pull request #925 from 0xProject/refactor/contracts/hashing
[contracts] Fix comments, styling and small optimization for hashOrder
-rw-r--r--packages/contracts/src/2.0.0/protocol/Exchange/MixinTransactions.sol16
-rw-r--r--packages/contracts/src/2.0.0/protocol/Exchange/libs/LibEIP712.sol30
-rw-r--r--packages/contracts/src/2.0.0/protocol/Exchange/libs/LibOrder.sol39
3 files changed, 56 insertions, 29 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinTransactions.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinTransactions.sol
index 88d2da7d7..b5de1a5de 100644
--- a/packages/contracts/src/2.0.0/protocol/Exchange/MixinTransactions.sol
+++ b/packages/contracts/src/2.0.0/protocol/Exchange/MixinTransactions.sol
@@ -123,19 +123,23 @@ contract MixinTransactions is
bytes32 dataHash = keccak256(data);
// Assembly for more efficiently computing:
- // keccak256(abi.encode(
+ // keccak256(abi.encodePacked(
// EIP712_ZEROEX_TRANSACTION_SCHEMA_HASH,
// salt,
- // signerAddress,
+ // bytes32(signerAddress),
// keccak256(data)
// ));
assembly {
+ // Load free memory pointer
let memPtr := mload(64)
- mstore(memPtr, schemaHash)
- mstore(add(memPtr, 32), salt)
- mstore(add(memPtr, 64), and(signerAddress, 0xffffffffffffffffffffffffffffffffffffffff))
- mstore(add(memPtr, 96), dataHash)
+
+ mstore(memPtr, schemaHash) // hash of schema
+ mstore(add(memPtr, 32), salt) // salt
+ mstore(add(memPtr, 64), and(signerAddress, 0xffffffffffffffffffffffffffffffffffffffff)) // signerAddress
+ mstore(add(memPtr, 96), dataHash) // hash of data
+
+ // Compute hash
result := keccak256(memPtr, 128)
}
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibEIP712.sol b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibEIP712.sol
index 1fc41dafd..b02f7632e 100644
--- a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibEIP712.sol
+++ b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibEIP712.sol
@@ -30,7 +30,7 @@ contract LibEIP712 {
string constant internal EIP712_DOMAIN_VERSION = "2";
// Hash of the EIP712 Domain Separator Schema
- bytes32 public constant EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH = keccak256(abi.encodePacked(
+ bytes32 constant internal EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH = keccak256(abi.encodePacked(
"EIP712Domain(",
"string name,",
"string version,",
@@ -45,11 +45,11 @@ contract LibEIP712 {
constructor ()
public
{
- EIP712_DOMAIN_HASH = keccak256(abi.encode(
+ EIP712_DOMAIN_HASH = keccak256(abi.encodePacked(
EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH,
keccak256(bytes(EIP712_DOMAIN_NAME)),
keccak256(bytes(EIP712_DOMAIN_VERSION)),
- address(this)
+ bytes32(address(this))
));
}
@@ -59,8 +59,28 @@ contract LibEIP712 {
function hashEIP712Message(bytes32 hashStruct)
internal
view
- returns (bytes32)
+ returns (bytes32 result)
{
- return keccak256(abi.encodePacked(EIP191_HEADER, EIP712_DOMAIN_HASH, hashStruct));
+ bytes32 eip712DomainHash = EIP712_DOMAIN_HASH;
+
+ // Assembly for more efficient computing:
+ // keccak256(abi.encodePacked(
+ // EIP191_HEADER,
+ // EIP712_DOMAIN_HASH,
+ // hashStruct
+ // ));
+
+ assembly {
+ // Load free memory pointer
+ let memPtr := mload(64)
+
+ mstore(memPtr, 0x1901000000000000000000000000000000000000000000000000000000000000) // EIP191 header
+ mstore(add(memPtr, 2), eip712DomainHash) // EIP712 domain hash
+ mstore(add(memPtr, 34), hashStruct) // Hash of struct
+
+ // Compute hash
+ result := keccak256(memPtr, 66)
+ }
+ return result;
}
}
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibOrder.sol b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibOrder.sol
index 4031ff26b..68f4f5f1b 100644
--- a/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibOrder.sol
+++ b/packages/contracts/src/2.0.0/protocol/Exchange/libs/LibOrder.sol
@@ -103,11 +103,12 @@ contract LibOrder is
bytes32 takerAssetDataHash = keccak256(order.takerAssetData);
// Assembly for more efficiently computing:
- // keccak256(abi.encode(
- // order.makerAddress,
- // order.takerAddress,
- // order.feeRecipientAddress,
- // order.senderAddress,
+ // keccak256(abi.encodePacked(
+ // EIP712_ORDER_SCHEMA_HASH,
+ // bytes32(order.makerAddress),
+ // bytes32(order.takerAddress),
+ // bytes32(order.feeRecipientAddress),
+ // bytes32(order.senderAddress),
// order.makerAssetAmount,
// order.takerAssetAmount,
// order.makerFee,
@@ -119,24 +120,26 @@ contract LibOrder is
// ));
assembly {
+ // Calculate memory addresses that will be swapped out before hashing
+ let pos1 := sub(order, 32)
+ let pos2 := add(order, 320)
+ let pos3 := add(order, 352)
+
// Backup
- // solhint-disable-next-line space-after-comma
- let temp1 := mload(sub(order, 32))
- let temp2 := mload(add(order, 320))
- let temp3 := mload(add(order, 352))
+ let temp1 := mload(pos1)
+ let temp2 := mload(pos2)
+ let temp3 := mload(pos3)
// Hash in place
- // solhint-disable-next-line space-after-comma
- mstore(sub(order, 32), schemaHash)
- mstore(add(order, 320), makerAssetDataHash)
- mstore(add(order, 352), takerAssetDataHash)
- result := keccak256(sub(order, 32), 416)
+ mstore(pos1, schemaHash)
+ mstore(pos2, makerAssetDataHash)
+ mstore(pos3, takerAssetDataHash)
+ result := keccak256(pos1, 416)
// Restore
- // solhint-disable-next-line space-after-comma
- mstore(sub(order, 32), temp1)
- mstore(add(order, 320), temp2)
- mstore(add(order, 352), temp3)
+ mstore(pos1, temp1)
+ mstore(pos2, temp2)
+ mstore(pos3, temp3)
}
return result;
}