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snt-gas-relay
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use MessageSigned contract to encapsulate message signing logic

This commit is contained in:
Ricardo Guilherme Schmidt 2018-04-26 02:09:03 -03:00
parent 62078f0fdc
commit 52d9983ae6
2 changed files with 6 additions and 84 deletions
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22
contracts/identity/IdentityGasRelay.sol
View File

@ -1,6 +1,7 @@
pragma solidity ^0.4.21;
import "./Identity.sol";
import "../common/MessageSigned.sol";
import "../token/ERC20Token.sol";
/**
@ -8,7 +9,7 @@ import "../token/ERC20Token.sol";
* @author Ricardo Guilherme Schmidt (Status Research & Development GmbH)
* @notice enables economic abstraction for Identity
*/
contract IdentityGasRelay is Identity {
contract IdentityGasRelay is Identity, MessageSigned {
bytes4 public constant CALL_PREFIX = bytes4(keccak256("callGasRelay(address,uint256,bytes32,uint256,uint256,address)"));
bytes4 public constant APPROVEANDCALL_PREFIX = bytes4(keccak256("approveAndCallGasRelay(address,address,uint256,bytes32,uint256,uint256)"));
@ -271,22 +272,7 @@ contract IdentityGasRelay is Identity {
}
/**
* @notice Hash a hash with `"\x19Ethereum Signed Message:\n32"`
* @param _hash Sign to hash.
* @return signHash Hash ethereum wallet signs.
*/
function getSignHash(
bytes32 _hash
)
pure
public
returns(bytes32 signHash)
{
signHash = keccak256("\x19Ethereum Signed Message:\n32", _hash);
}
/**
* @notice recovers address who signed the message
* @notice recovers key who signed the message
* @param _signHash operation ethereum signed message hash
* @param _messageSignature message `_signHash` signature
* @param _pos which signature to read
@ -321,7 +307,7 @@ contract IdentityGasRelay is Identity {
*/
function signatureSplit(bytes _signatures, uint256 _pos)
pure
public
internal
returns (uint8 v, bytes32 r, bytes32 s)
{
uint pos = _pos + 1;

68
contracts/status/SNTController.sol
View File

@ -2,6 +2,7 @@ pragma solidity ^0.4.17;
import "../token/TokenController.sol";
import "../common/Owned.sol";
import "../common/MessageSigned.sol";
import "../token/ERC20Token.sol";
import "../token/MiniMeToken.sol";
@ -10,7 +11,7 @@ import "../token/MiniMeToken.sol";
* @author Ricardo Guilherme Schmidt (Status Research & Development GmbH)
* @notice enables economic abstraction for SNT
*/
contract SNTController is TokenController, Owned {
contract SNTController is TokenController, Owned, MessageSigned {
bytes4 public constant TRANSFER_PREFIX = bytes4(keccak256("transferSNT(address,uint256,uint256,uint256)"));
@ -229,70 +230,5 @@ contract SNTController is TokenController, Owned {
_gasPrice
);
}
/**
* @notice recovers address who signed the message
* @param _signHash operation ethereum signed message hash
* @param _messageSignature message `_signHash` signature
*/
function recoverAddress(
bytes32 _signHash,
bytes _messageSignature
)
pure
public
returns(address)
{
uint8 v;
bytes32 r;
bytes32 s;
(v,r,s) = signatureSplit(_messageSignature);
return ecrecover(
_signHash,
v,
r,
s
);
}
/**
* @dev divides bytes signature into `uint8 v, bytes32 r, bytes32 s`
*/
function signatureSplit(bytes _signature)
pure
public
returns (uint8 v, bytes32 r, bytes32 s)
{
// The signature format is a compact form of:
// {bytes32 r}{bytes32 s}{uint8 v}
// Compact means, uint8 is not padded to 32 bytes.
assembly {
r := mload(add(_signature, 32))
s := mload(add(_signature, 64))
// Here we are loading the last 32 bytes, including 31 bytes
// of 's'. There is no 'mload8' to do this.
//
// 'byte' is not working due to the Solidity parser, so lets
// use the second best option, 'and'
v := and(mload(add(_signature, 65)), 0xff)
}
require(v == 27 || v == 28);
}
/**
* @notice Hash a hash with `"\x19Ethereum Signed Message:\n32"`
* @param _hash Sign to hash.
* @return signHash Hash to be signed.
*/
function getSignHash(
bytes32 _hash
)
pure
public
returns (bytes32 signHash)
{
signHash = keccak256("\x19Ethereum Signed Message:\n32", _hash);
}
}