The following smart contract code is only an example and is NOT to be used in Production systems.

pragma solidity ^0.4.11;

/**

 * Math operations with safety checks

 */

library SafeMath {

  function mul(uint a, uint b) internal pure returns (uint) {

    uint c = a * b;

    assert(a == 0 || c / a == b);

    return c;

  }

  function div(uint a, uint b) internal pure returns (uint) {

    assert(b > 0);

    uint c = a / b;

    assert(a == b * c + a % b);

    return c;

  }

  function sub(uint a, uint b) internal pure returns (uint) {

    assert(b <= a);

    return a - b;

  }

  function add(uint a, uint b) internal pure returns (uint) {

    uint c = a + b;

    assert(c >= a);

    return c;

  }

  function max64(uint64 a, uint64 b) internal pure returns (uint64) {

    return a >= b ? a : b;

  }

  function min64(uint64 a, uint64 b) internal pure returns (uint64) {

    return a < b ? a : b;

  }

  function max256(uint256 a, uint256 b) internal pure returns (uint256) {

    return a >= b ? a : b;

  }

  function min256(uint256 a, uint256 b) internal pure returns (uint256) {

    return a < b ? a : b;

  }

}


contract ERC20Protocol {

    /* This is a slight change to the ERC20 base standard.

    function totalSupply() constant returns (uint supply);

    is replaced with:

    uint public totalSupply;

    This automatically creates a getter function for the totalSupply.

    This is moved to the base contract since public getter functions are not

    currently recognised as an implementation of the matching abstract

    function by the compiler.

    */

    /// total amount of tokens

    uint public totalSupply;

    /// @param _owner The address from which the balance will be retrieved

    /// @return The balance

    function balanceOf(address _owner) public constant returns (uint balance);

    /// @notice send `_value` token to `_to` from `msg.sender`

    /// @param _to The address of the recipient

    /// @param _value The amount of token to be transferred

    /// @return Whether the transfer was successful or not

    function transfer(address _to, uint _value) public returns (bool success);

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`

    /// @param _from The address of the sender

    /// @param _to The address of the recipient

    /// @param _value The amount of token to be transferred

    /// @return Whether the transfer was successful or not

    function transferFrom(address _from, address _to, uint _value) public returns (bool success);

	///if you want to use privacy transaction,you need to implement this function in your contract

    /// @notice send `_value` token to `_to` from `msg.sender`

    /// @param _to The address of the recipient

    /// @param _toKey the ota pubkey

    /// @param _value The amount of token to be transferred

    /// @return Whether the transfer was successful or not

    function otatransfer(address _to, bytes _toKey, uint256 _value) public returns (string);    

	///check privacy transaction

    /// @param _owner The address from which the ota balance will be retrieved

    /// @return The balance

    function otabalanceOf(address _owner) public constant returns (uint256 balance);

    /// @notice `msg.sender` approves `_spender` to spend `_value` tokens

    /// @param _spender The address of the account able to transfer the tokens

    /// @param _value The amount of tokens to be approved for transfer

    /// @return Whether the approval was successful or not

    function approve(address _spender, uint _value) public returns (bool success);

    /// @param _owner The address of the account owning tokens

    /// @param _spender The address of the account able to transfer the tokens

    /// @return Amount of remaining tokens allowed to spent

    function allowance(address _owner, address _spender) public constant returns (uint remaining);

    event Transfer(address indexed _from, address indexed _to, uint _value);

    event Approval(address indexed _owner, address indexed _spender, uint _value);

}

//the contract implements ERC20Protocol interface with privacy transaction

contract StandardToken is ERC20Protocol {

    using SafeMath for uint;

    string public constant name = "WanToken-Beta";

    string public constant symbol = "WanToken";

    uint public constant decimals = 18;

    function transfer(address _to, uint _value) public returns (bool success) {

        if (balances[msg.sender] >= _value) {

            balances[msg.sender] -= _value;

            balances[_to] += _value;

            Transfer(msg.sender, _to, _value);

            return true;

        } else { return false; }

    }

    function transferFrom(address _from, address _to, uint _value) public returns (bool success) {

        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value) {

            balances[_to] += _value;

            balances[_from] -= _value;

            allowed[_from][msg.sender] -= _value;

            Transfer(_from, _to, _value);

            return true;

        } else { return false; }

    }

    function balanceOf(address _owner) public constant returns (uint balance) {

        return balances[_owner];

    }

    function approve(address _spender, uint _value) public returns (bool success) {

        assert((_value == 0) || (allowed[msg.sender][_spender] == 0));

        allowed[msg.sender][_spender] = _value;

        Approval(msg.sender, _spender, _value);

        return true;

    }   

    function allowance(address _owner, address _spender) public constant returns (uint remaining) {

      return allowed[_owner][_spender];

    }

////////////////////////////////////////////////////////////////////////

mapping (address => uint) balances;

mapping (address => mapping (address => uint)) allowed;

// privacy balance, bytes for public key

mapping (address => uint256) public privacyBalance;

mapping (address => bytes) public otaKey;

//this only for initialize, only for test to mint token to one wan address

function initPrivacyAsset(address initialBase, bytes baseKeyBytes, uint256 value) public {

    privacyBalance[initialBase] = value;

    otaKey[initialBase] = baseKeyBytes;

}   

// return string just for debug

function otatransfer(address _to, bytes _toKey, uint256 _value) public returns (string) {

    if(privacyBalance[msg.sender] < _value) return "sender token too low";

    privacyBalance[msg.sender] -= _value;

    privacyBalance[_to] += _value;

    otaKey[_to] = _toKey;

    return "success";

} 

//check privacy balance

function otabalanceOf(address _owner) public view returns (uint256 balance) {

    return privacyBalance[_owner];

}

Note:

  1. Privacy transaction function is "otatransfer" in the ERC20 Protocol, the contract with privacy transaction need to implement ERC20 Protocol
  2. Privacy balance is stored in the map privacyBalance, function otabalanceOf can get this balance

How to compile and deploy:

Requirement:

1: a working Wanchain client, go to the github site, https://github.com/wanchain/go-wanchain, to get the latest version

2: remix https://remix.ethereum.org, which is an amazing online smart contract development IDE

3: your awesome Dapp consists of one or multiple smart contracts

Steps:

1: go to remix, copy and paste your smart contract code, make static syntax analysis, and compile it

2: click Details on the right panel of remix, copy all the code of WEB3DEPLOY section from the pop-up

3: copy the script and run it in gwan console

var erc20simple_contract = web3.eth.contract([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_toKey","type":"bytes"},{"name":"_value","type":"uint256"}],"name":"otatransfer","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"privacyBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"initialBase","type":"address"},{"name":"baseKeyBytes","type":"bytes"},{"name":"value","type":"uint256"}],"name":"initPrivacyAsset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"otabalanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"otaKey","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}]);

var erc20simple = erc20simple_contract.new(

{

from: web3.eth.accounts[1],

data: '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',

gas: '4700000'

}, function (e, contract){

console.log(e, contract);

if (typeof contract.address !== 'undefined') {

console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);

}

})

4: the transaction id and contract address (hash values starting with '0x') will be printed out onto the console after few seconds

5: now, you can play with your Dapp

Note:

You can locate a demo WANCHAIN token contract and involved scripts under contracts/demo/ directory

How to invoke privacy transfer

After deployed above token contract on WANCHAIN,in the WANCHAIN console,you can invoke token privacy transaction according to following process:

Suppose there are at lease 3 accounts in your WANCHAIN node

  1. Define asset function and variable
var initPriBalance = 10000;

var priTranValue = 888;

var wanBalance = function(addr){

	return web3.fromWin(web3.eth.getBalance(addr));

}

var wanUnlock = function(addr){

    return personal.unlockAccount(addr,"wanglu",99999);

}

var sendWanFromUnlock = function (From, To , V){

	eth.sendTransaction({from:From, to: To, value: web3.toWin(V)});

}

var wait = function (conditionFunc) {

	var loopLimit = 130;

	var loopTimes = 0;

	while (!conditionFunc()) {

		admin.sleep(2);

		loopTimes++;

		if(loopTimes>=loopLimit){

			throw Error("wait timeout! conditionFunc:" + conditionFunc)

		}

	}

}

wanUnlock(eth.accounts[1])

wanUnlock(eth.accounts[2])

stampBalance = 0.09;
  1. buy stamp for token privacy transaction
abiDefStamp = [{"constant":false,"type":"function","stateMutability":"nonpayable","inputs":[{"name":"OtaAddr","type":"string"},{"name":"Value","type":"uint256"}],"name":"buyStamp","outputs":[{"name":"OtaAddr","type":"string"},{"name":"Value","type":"uint256"}]},{"constant":false,"type":"function","inputs":[{"name":"RingSignedData","type":"string"},{"name":"Value","type":"uint256"}],"name":"refundCoin","outputs":[{"name":"RingSignedData","type":"string"},{"name":"Value","type":"uint256"}]},{"constant":false,"type":"function","stateMutability":"nonpayable","inputs":[],"name":"getCoins","outputs":[{"name":"Value","type":"uint256"}]}];

contractDef = eth.contract(abiDefStamp);

stampContractAddr = "0x00000000000000000000000000000000000000c8";

stampContract = contractDef.at(stampContractAddr);

var wanAddr = wan.getWanAddress(eth.accounts[1]);

var otaAddrStamp = wan.generateOneTimeAddress(wanAddr);

txBuyData = stampContract.buyStamp.getData(otaAddrStamp, web3.toWin(stampBalance));

sendTx = eth.sendTransaction({from:eth.accounts[1], to:stampContractAddr, value:web3.toWin(stampBalance), data:txBuyData, gas: 1000000});

wait(function(){return eth.getTransaction(sendTx).blockNumber != null;});

keyPairs = wan.computeOTAPPKeys(eth.accounts[1], otaAddrStamp).split('+');

privateKeyStamp = keyPairs[0];
  1. get stamp mix set for ring sign
var mixStampAddresses = wan.getOTAMixSet(otaAddrStamp,2);

var mixSetWith0x = []

for (i = 0; i < mixStampAddresses.length; i++){

    mixSetWith0x.push(mixStampAddresses[i])

}
  1. define token contract ABI
var erc20simple_contract = web3.eth.contract([{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_toKey","type":"bytes"},{"name":"_value","type":"uint256"}],"name":"otatransfer","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"privacyBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"initialBase","type":"address"},{"name":"baseKeyBytes","type":"bytes"},{"name":"value","type":"uint256"}],"name":"initPrivacyAsset","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"otabalanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"otaKey","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}]);

contractAddr = '0xa2e526a3632d225f15aa0592e00bed31a48c953d';

//this address should changed according to your contract deploy

erc20simple = erc20simple_contract.at(contractAddr)
  1. create one time address for account1
var wanAddr = wan.getWanAddress(eth.accounts[1]);

var otaAddrTokenHolder = wan.generateOneTimeAddress(wanAddr);

keyPairs = wan.computeOTAPPKeys(eth.accounts[1], otaAddrTokenHolder).split('+');

privateKeyTokenHolder = keyPairs[0];

addrTokenHolder = keyPairs[2];

sendTx = erc20simple.initPrivacyAsset.sendTransaction(addrTokenHolder, otaAddrTokenHolder, '0x' + initPriBalance.toString(16), {from:eth.accounts[1], gas:1000000});

wait(function(){return eth.getTransaction(sendTx).blockNumber != null;});

ota1Balance = erc20simple.privacyBalance(addrTokenHolder)

if (ota1Balance != initPriBalance) {

	throw Error('ota1 balance wrong! balance:' + ota1Balance + ', except:' + initPriBalance)

}
  1. generate ring sign data
var hashMsg = addrTokenHolder

var ringSignData = personal.genRingSignData(hashMsg, privateKeyStamp, mixSetWith0x.join("+"))
  1. create one time address for account2
var wanAddr = wan.getWanAddress(eth.accounts[2]);

var otaAddr4Account2 = wan.generateOneTimeAddress(wanAddr);

keyPairs = wan.computeOTAPPKeys(eth.accounts[2], otaAddr4Account2).split('+');

privateKeyOtaAcc2 = keyPairs[0];

addrOTAAcc2 = keyPairs[2];
  1. generate token privacy transfer data
cxtInterfaceCallData = erc20simple.otatransfer.getData(addrOTAAcc2, otaAddr4Account2, priTranValue);

``

9. generate call token privacy transfer data

``C++

glueContractDef = eth.contract([{"constant":false,"type":"function","inputs":[{"name":"RingSignedData","type":"string"},{"name":"CxtCallParams","type":"bytes"}],"name":"combine","outputs":[{"name":"RingSignedData","type":"string"},{"name":"CxtCallParams","type":"bytes"}]}]);

glueContract = glueContractDef.at("0x0000000000000000000000000000000000000000")

combinedData = glueContract.combine.getData(ringSignData, cxtInterfaceCallData)

10.send privacy transaction

sendTx = personal.sendPrivacyCxtTransaction({from:addrTokenHolder, to:contractAddr, value:0, data: combinedData, gasprice:'0x' + (200000000000).toString(16)}, privateKeyTokenHolder)

wait(function(){return eth.getTransaction(sendTx).blockNumber != null;});
  1. check balance
ota2Balance = erc20simple.privacyBalance(addrOTAAcc2)

if (ota2Balance != priTranValue) {

	throw Error("ota2 balance wrong. balance:" + ota2Balance +  ", expect:" + priTranValue)

}

ota1Balance = erc20simple.privacyBalance(addrTokenHolder)

if (ota1Balance != initPriBalance - priTranValue) {

	throw Error("ota2 balance wrong. balance:" + ota1Balance +  ", expect:" + (initPriBalance - priTranValue))

}

最新文章

  1. plist文件的读取和xib加载cell
  2. BZOJ4537 : [Hnoi2016]最小公倍数
  3. bzoj1029 [JSOI2007]建筑抢修
  4. Python之socketserver源码分析
  5. 自绘CProgressCtrl进度条控件，支持自定义显示文本和进程百分比信息
  6. BZOJ 2762: [JLOI2011]不等式组( 平衡树 )
  7. Asp.Net异步编程
  8. IIS下防止mdb数据库被下载的实现方法
  9. Codeforces Round #426 (Div. 2)【A.枚举，B.思维，C,二分＋数学】
  10. ROC曲线的AUC（以及其他评价指标的简介）知识整理
  11. [Swift]LeetCode942. 增减字符串匹配 | DI String Match
  12. C# 对MongoDB 进行增删改查的简单操作
  13. dhcp服务简单配置
  14. 使用pm2离线部署nodejs项目
  15. shiro 单点登录原理 实例
  16. MySQL 全文检索 ngram插件
  17. [java]转:String Date Calendar之间的转换
  18. java与xml转换 -- XStreamAlias
  19. JSP基本_JSPの構成要素、アクション、ディレクティブ
  20. [转]Github 简明教程

热门文章

  1. ExtJS学习(三)Grid表格
  2. android之.9.png详解
  3. 03 ProgressBar 进度条
  4. CSS 控制table 滑动及调整列宽等问题总结
  5. 深入浅出EF之ModelFirst和DBFirst
  6. CentOS 64-bit下安装JDK和Tomcat并设置Tomcat开机启动操作步骤
  7. Android进阶(八)Can&#39;t create handler inside thread that has not called Looper.prepare()
  8. Eclipse插件 - FindBugs 检查代码隐藏的 Bug
  9. 【shell脚本练习】判断用户存在和用户类型
  10. 柔弱的APP如何自我保护，浅谈APP防御手段，使用360加固助手加固/签名/多渠道打包/应用市场发布