NodeJS实现银联网关支付：签名与验签详解

//配置银联支付需要的数据 - 这都是银联测试商户信息，可以上 https://merchant.unionpay.com/portal/login.jsp 去申请测试商户
merId: '777290058136713', //商户id
font_trans_url: 'https://101.231.204.80:5000/gateway/api/frontTransReq.do', //网关跳转至银联平台支付页面地址
sigle_query_url: 'https://101.231.204.80:5000/gateway/api/queryTrans.do', //单笔查询请求地址
sign_cert_dir: __dirname + '/certificates', //签名证书路径
certId: '40220995861346480087409489142384722381',
sign_cert_pwd: '0000000', //签名证书密码
sign_cert_path: __dirname + '/certificates/700000000000001_acp.pfx', //签名用私钥证书
validate_cert_path: __dirname + '/certificates/verify_sign_acp.cer', //验签用银联公钥证书

var validator = require('validator'),
util = require('util'),
_ = require('underscore'),
crypto = require('crypto'),
x509 = require('x509'),
sha1 = require('sha1'),
wopenssl = require('wopenssl'),
config = require('./config'); //加载银联配置
//银联网关支付
var unionPay = {
//创建预订单
/*
* 参数 parms: {out_trade_no: OUT_TRADE_NO, fee: FEE}
* out_trade_no 商户订单号 fee 订单金额，单位分
*/
sdk_front_notice_url: 'http://'+ config.domain +'/unionPay/result', //银联网关支付前台通知地址
sdk_back_notic_url: 'http://'+ config.domain +'/unionPay/productPay', //银联网关支付后台通知地址
createOrder:
function(parms, callback) {
var errmsg;
var timeStamp = parms.timeStamp;
if(parms.payType==0) {
var back_notic_url = 'http://'+ config.domain +'/unionPay/productPay';
} else if(parms.payType==1) {
var back_notic_url = 'http://'+ config.domain +'/unionPay/rechargePay';
} else {
var back_notic_url = this.sdk_back_notic_url;
}
var formData = {
'version' : '5.0.0', //版本号
'encoding' : 'utf-8', //编码方式
'txnType' : '01', //交易类型
'txnSubType' : '01', //交易子类
'bizType' : '000201', //业务类型
'frontUrl' : this.sdk_front_notice_url, //前台通知地址
'signMethod' : '01', //签名方法
'channelType' : '08', //渠道类型，07-PC，08-手机
'accessType' : '0', //接入类型
'currencyCode' : '156', //交易币种，境内商户固定156
//TODO 以下信息需要填写
'merId' : config.merId, //商户代码，请改自己的测试商户号，此处默认取demo演示页面传递的参数
'orderId' : parms.out_trade_no, //商户订单号，8-32位数字字母，不能含“-”或“_”，此处默认取demo演示页面传递的参数，可以自行定制规则
'txnTime' : timeStamp, //订单发送时间timestamp，格式为YYYYMMDDhhmmss，取北京时间，此处默认取demo演示页面传递的参数
'txnAmt' : parms.fee, //交易金额，单位分
'backUrl' : back_notic_url, //后台通知地址
'certId' : '' //可不必填写，在SignKeyFromPfx中返回
};
var privateKey;
var certId;
var cert;
SignKeyFromPfx(function(err , result){
if (err) {
errmsg = '证书签名失败';
} else { 
certId = result.certId;
privateKey = result.key;
formData.certId = certId;
if (formData.signature) {
delete formData.signature
}
//----签名开始----
//参数转变为签名串
var unionPay_parms = transForSign(formData);
//摘要
var unionPay_parms_sha1 = sha1(unionPay_parms);
//签名
var signer = crypto.createSign('RSA-SHA1');
signer.update(unionPay_parms_sha1);
var signature_base64 = signer.sign(privateKey, 'base64');
//放入域中
formData.signature = signature_base64;
//加入表单请求银联的地址
formData.action_url = config.font_trans_url;
//console.log(formData);
if (errmsg) {
callback(errmsg);
} else {
callback(null,formData);
}
}
});
},
//签名
sign:
function(parms, callback) {
var errmsg;
var formData = parms;
SignKeyFromPfx(function(err , result){
if (err) {
errmsg = '证书签名失败';
} else { 
certId = result.certId;
privateKey = result.key;
if (formData.signature) {
delete formData.signature
}
//----签名开始----
//参数转变为签名串
var unionPay_parms = transForSign(formData);
//摘要
var unionPay_parms_sha1 = sha1(unionPay_parms);
//签名
var signer = crypto.createSign('RSA-SHA1');
signer.update(unionPay_parms_sha1);
var signature_base64 = signer.sign(privateKey, 'base64');
//放入域中
formData.signature = signature_base64;
//console.log(formData);
if (errmsg) {
callback(errmsg);
} else {
callback(null,formData);
}
}
});
},
//验签
validate:
function(parms,callback) {
var validate_signature = parms.signature;
delete parms.signature;
var formData = parms;
ValidateKeyFromCer(formData,validate_signature,function(err , result){
if (err || !validate_signature || !formData) {
console.log('验签失败');
callback('验签失败');
} else { 
var publicKey = result.key;
if (formData.signature) {
delete formData.signature
}
//----验签开始----
var unionPay_parms = transForSign(formData);
var unionPay_parms_sha1 = sha1(unionPay_parms);
//console.log('待验证签：' + validate_signature);
var verifier = crypto.createVerify('RSA-SHA1');
//console.log('验证签名public key:\n' + publicKey);
//console.log('验证签名src_sign:' + unionPay_parms_sha1);
verifier.update(new Buffer(unionPay_parms_sha1, 'utf-8'));
var is_success = verifier.verify(publicKey, validate_signature, 'base64');
if (is_success) {
callback(null,formData);
} else {
console.log('验签不相等');
callback('验签不相等');
}
}
});
}
};
// 签名串算法--将参数排序，转成键值对格式字符串
function transForSign(params){
var array = []
for (var i in params) {
array.push('' + i + '=' + params[i])
}
var stringSignTemp = _.sortBy(array, function (str) {
return str;
});
return stringSignTemp.join('&');
};
//通过证书密码获得证书的rsa-privatekey值和证书Id
function SignKeyFromPfx(callback){
if (config.certsData) {
callback(null, config.certsData);
} else {
var certPath = config.sign_cert_path;
var certPwd = config.sign_cert_pwd;
var certDir = config.sign_cert_dir;
var p12 = wopenssl.pkcs12.extract(certPath, certPwd);
//console.log(p12.certificate); //p12.certificate和p12.rsa
var certs = wopenssl.x509.parseCert(p12.certificate);
//因为不知道怎么将十六进制证书id:certs.serial变成十进制证书id，因为这是个很大的整形biglong
var certsData = {};
certsData.certId = config.certId;
certsData.key = p12.rsa;
certsData.ca = certs;
//存入config
config.certsData = certsData;
callback(null,certsData); //{key: String, certId: String, ca: Array}
}
};
//获得验签证书的rsa-publickey值
function ValidateKeyFromCer(formData, signature, callback){
if (config.validCertsData) {
callback(null, config.validCertsData);
} else {
var validateCertPath = config.validate_cert_path;
var certs = wopenssl.x509.parseCert(validateCertPath);
//console.log(certs);
var fs = require('fs');
var CERTIFICATE = fs.readFileSync(validateCertPath);
console.log(CERTIFICATE);
var publicKey = CERTIFICATE.toString('ascii');
var validCertsData = {};
validCertsData.key = publicKey;
validCertsData.cert = CERTIFICATE;
config.validCertsData = validCertsData;
if (publicKey) {
callback(null,validCertsData);
} else {
msg = '验签失败';
callback(msg);
}
}
};
//转化时间格式函数
function format(){
//时间格式化
var format = 'yyyyMMddhhmmss';
date = new Date();
var o = {
'M+' : date.getMonth() + 1, //month
'd+' : date.getDate(), //day
'h+' : date.getHours(), //hour
'm+' : date.getMinutes(), //minute
's+' : date.getSeconds(), //second
'q+' : Math.floor((date.getMonth() + 3) / 3), //quarter
'S' : date.getMilliseconds() //millisecond
};
if (/(y+)/.test(format))
format = format.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length));
for (var k in o)
if (new RegExp('(' + k + ')').test(format))
format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ('00' + o[k]).substr(('' + o[k]).length));
return format;
};
module.exports = unionPay;