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Diffstat (limited to 'packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol')
-rw-r--r--packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol84
1 files changed, 81 insertions, 3 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol b/packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol
index fd655e757..6bfbb5107 100644
--- a/packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol
+++ b/packages/contracts/src/2.0.0/protocol/Exchange/MixinSignatureValidator.sol
@@ -17,7 +17,6 @@
*/
pragma solidity 0.4.24;
-pragma experimental "v0.5.0";
import "../../utils/LibBytes/LibBytes.sol";
import "./mixins/MSignatureValidator.sol";
@@ -192,7 +191,11 @@ contract MixinSignatureValidator is
// Signature verified by wallet contract.
// If used with an order, the maker of the order is the wallet contract.
} else if (signatureType == SignatureType.Wallet) {
- isValid = IWallet(signerAddress).isValidSignature(hash, signature);
+ isValid = isValidWalletSignature(
+ hash,
+ signerAddress,
+ signature
+ );
return isValid;
// Signature verified by validator contract.
@@ -210,7 +213,8 @@ contract MixinSignatureValidator is
if (!allowedValidators[signerAddress][validatorAddress]) {
return false;
}
- isValid = IValidator(validatorAddress).isValidSignature(
+ isValid = isValidValidatorSignature(
+ validatorAddress,
hash,
signerAddress,
signature
@@ -258,4 +262,78 @@ contract MixinSignatureValidator is
// signature was invalid.)
revert("SIGNATURE_UNSUPPORTED");
}
+
+ /// @dev Verifies signature using logic defined by Wallet contract.
+ /// @param hash Any 32 byte hash.
+ /// @param walletAddress Address that should have signed the given hash
+ /// and defines its own signature verification method.
+ /// @param signature Proof that the hash has been signed by signer.
+ /// @return True if signature is valid for given wallet..
+ function isValidWalletSignature(
+ bytes32 hash,
+ address walletAddress,
+ bytes signature
+ )
+ internal
+ view
+ returns (bool isValid)
+ {
+ bytes memory calldata = abi.encodeWithSelector(
+ IWallet(walletAddress).isValidSignature.selector,
+ hash,
+ signature
+ );
+ assembly {
+ let cdStart := add(calldata, 32)
+ let success := staticcall(
+ gas, // forward all gas
+ walletAddress, // address of Wallet contract
+ cdStart, // pointer to start of input
+ mload(calldata), // length of input
+ cdStart, // write input over output
+ 32 // output size is 32 bytes
+ )
+ // Signature is valid if call did not revert and returned true
+ isValid := and(success, mload(cdStart))
+ }
+ return isValid;
+ }
+
+ /// @dev Verifies signature using logic defined by Validator contract.
+ /// @param validatorAddress Address of validator contract.
+ /// @param hash Any 32 byte hash.
+ /// @param signerAddress Address that should have signed the given hash.
+ /// @param signature Proof that the hash has been signed by signer.
+ /// @return True if the address recovered from the provided signature matches the input signer address.
+ function isValidValidatorSignature(
+ address validatorAddress,
+ bytes32 hash,
+ address signerAddress,
+ bytes signature
+ )
+ internal
+ view
+ returns (bool isValid)
+ {
+ bytes memory calldata = abi.encodeWithSelector(
+ IValidator(signerAddress).isValidSignature.selector,
+ hash,
+ signerAddress,
+ signature
+ );
+ assembly {
+ let cdStart := add(calldata, 32)
+ let success := staticcall(
+ gas, // forward all gas
+ validatorAddress, // address of Validator contract
+ cdStart, // pointer to start of input
+ mload(calldata), // length of input
+ cdStart, // write input over output
+ 32 // output size is 32 bytes
+ )
+ // Signature is valid if call did not revert and returned true
+ isValid := and(success, mload(cdStart))
+ }
+ return isValid;
+ }
}