微信小程序前端自处理：

//时间戳
timeStamp() {
　　return parseInt(new Date().getTime() / 1000) + ''
},
//随机数
randomString() {
　　var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
　　var maxPos = chars.length;
　　var pwd = '';
　　for (var i = 0; i < 32; i++) {
　　　　pwd += chars.charAt(Math.floor(Math.random() * maxPos));
　　}
　　return pwd;
},
/***
1、appid:小程序APPID，key：微信商户平台（pay.winxin.qq.com）-->账号设置-->API安全-->密钥设置（商户密钥）
2、微信支付所需的另四个参数按照参数名ASCII码从小到大排序，形成stringA
3、在stringA前面添加APPID，最后面添加key得到stringSignTemp字符串，并对stringSignTemp进行MD5运算，再将的到的字符串所有字符转换为大写，得到sign值signValue。
 
***/
//调起支付签名
MixedencryMD5(prepay_id, randomString, timeStamp) {
　　return "appId=" + this.data.appid + "&nonceStr=" + randomString + "&package=prepay_id=" + prepay_id + "&signType=MD5" + "&timeStamp=" + timeStamp + "&key=" + this.data.key;
},
//调起微信支付按钮
_payBtn(){
　　let _this=this,
　　openid=wx.getStorageSync('openId');
　　wx.request({
　　　　url: '订单接口获取prepay_id支付订单号',
　　　　data: {
　　　　　　id: _this.properties.orderid,
　　　　　　openId: openid
　　　　},
　　　　method: 'POST',
　　　　header: {
　　　　　　"content-type": "application/x-www-form-urlencoded" //post请求设置
　　　　},
　　　　success: res => {
　　　　　　console.log(res)
　　　　　　let timeStamp = this.timeStamp(),
　　　　　　nonceStr = this.randomString(),
　　　　　　prepay_id = res.data.content.prepay_id,
　　　　　　MixedencryMD5 = this.MixedencryMD5(prepay_id, nonceStr, timeStamp),
　　　　　　paySign = md5.MD5(MixedencryMD5).toUpperCase(),/***签名MD5加密并转换成大写***/
　　　　　　orderid = _this.properties.orderid;
　　　　　　wx.requestPayment({/***微信支付***/
　　　　　　timeStamp: timeStamp,
　　　　　　nonceStr: nonceStr,
　　　　　　package: 'prepay_id=' + prepay_id,
　　　　　　signType: 'MD5',
　　　　　　paySign: paySign,
　　　　　　success:function(res){
　　　　　　　　//支付成功回调
　　　　　　}
　　　})
}
 
小程序微信支付MD5加密：
/*

 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message

 * Digest Algorithm, as defined in RFC 1321.

 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.

 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet

 * Distributed under the BSD License

 */

/*

 * Configurable variables. You may need to tweak these to be compatible with

 * the server-side, but the defaults work in most cases.

 */

var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */

var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance   */

var chrsz = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

/*

 * These are the functions you'll usually want to call

 * They take string arguments and return either hex or base-64 encoded strings

 */

function hex_md5(s) { return binl2hex(core_md5(str2binl(s), s.length * chrsz)); }

function b64_md5(s) { return binl2b64(core_md5(str2binl(s), s.length * chrsz)); }

function str_md5(s) { return binl2str(core_md5(str2binl(s), s.length * chrsz)); }

function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }

function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }

function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }

/*

 * Perform a simple self-test to see if the VM is working

 */

function md5_vm_test() {

  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";

}

/*

 * Calculate the MD5 of an array of little-endian words, and a bit length

 */

function core_md5(x, len) {

  /* append padding */

  x[len >> 5] |= 0x80 << ((len) % 32);

  x[(((len + 64) >>> 9) << 4) + 14] = len;

  var a = 1732584193;

  var b = -271733879;

  var c = -1732584194;

  var d = 271733878;

  for (var i = 0; i < x.length; i += 16) {

    var olda = a;

    var oldb = b;

    var oldc = c;

    var oldd = d;

    a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);

    d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);

    c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);

    b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);

    a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);

    d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);

    c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);

    b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);

    a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);

    d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);

    c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);

    b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);

    a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);

    d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);

    c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);

    b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);

    a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);

    d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);

    c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);

    b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);

    a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);

    d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);

    c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);

    b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);

    a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);

    d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);

    c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);

    b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);

    a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);

    d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);

    c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);

    b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);

    a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);

    d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);

    c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);

    b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);

    a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);

    d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);

    c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);

    b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);

    a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);

    d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);

    c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);

    b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);

    a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);

    d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);

    c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);

    b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);

    a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);

    d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);

    c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);

    b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);

    a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);

    d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);

    c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);

    b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);

    a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);

    d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);

    c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);

    b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);

    a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);

    d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);

    c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);

    b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);

    a = safe_add(a, olda);

    b = safe_add(b, oldb);

    c = safe_add(c, oldc);

    d = safe_add(d, oldd);

  }

  return Array(a, b, c, d);

}

/*

 * These functions implement the four basic operations the algorithm uses.

 */

function md5_cmn(q, a, b, x, s, t) {

  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);

}

function md5_ff(a, b, c, d, x, s, t) {

  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);

}

function md5_gg(a, b, c, d, x, s, t) {

  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);

}

function md5_hh(a, b, c, d, x, s, t) {

  return md5_cmn(b ^ c ^ d, a, b, x, s, t);

}

function md5_ii(a, b, c, d, x, s, t) {

  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);

}

/*

 * Calculate the HMAC-MD5, of a key and some data

 */

function core_hmac_md5(key, data) {

  var bkey = str2binl(key);

  if (bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);

  var ipad = Array(16), opad = Array(16);

  for (var i = 0; i < 16; i++) {

    ipad[i] = bkey[i] ^ 0x36363636;

    opad[i] = bkey[i] ^ 0x5C5C5C5C;

  }

  var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);

  return core_md5(opad.concat(hash), 512 + 128);

}

/*

 * Add integers, wrapping at 2^32. This uses 16-bit operations internally

 * to work around bugs in some JS interpreters.

 */

function safe_add(x, y) {

  var lsw = (x & 0xFFFF) + (y & 0xFFFF);

  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);

  return (msw << 16) | (lsw & 0xFFFF);

}

/*

 * Bitwise rotate a 32-bit number to the left.

 */

function bit_rol(num, cnt) {

  return (num << cnt) | (num >>> (32 - cnt));

}

/*

 * Convert a string to an array of little-endian words

 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.

 */

function str2binl(str) {

  var bin = Array();

  var mask = (1 << chrsz) - 1;

  for (var i = 0; i < str.length * chrsz; i += chrsz)

    bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);

  return bin;

}

/*

 * Convert an array of little-endian words to a string

 */

function binl2str(bin) {

  var str = "";

  var mask = (1 << chrsz) - 1;

  for (var i = 0; i < bin.length * 32; i += chrsz)

    str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);

  return str;

}

/*

 * Convert an array of little-endian words to a hex string.

 */

function binl2hex(binarray) {

  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";

  var str = "";

  for (var i = 0; i < binarray.length * 4; i++) {

    str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +

      hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF);

  }

  return str;

}

/*

 * Convert an array of little-endian words to a base-64 string

 */

function binl2b64(binarray) {

  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

  var str = "";

  for (var i = 0; i < binarray.length * 4; i += 3) {

    var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16)

      | (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8)

      | ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);

    for (var j = 0; j < 4; j++) {

      if (i * 8 + j * 6 > binarray.length * 32) str += b64pad;

      else str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);

    }

  }

  return str;

}

module.exports = {

  MD5: hex_md5

}
 
/*
* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
* Digest Algorithm, as defined in RFC 1321.
* Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
* Distributed under the BSD License
*/
/*
* Configurable variables. You may need to tweak these to be compatible with
* the server-side, but the defaults work in most cases.
*/
var hexcase = ; /* hex output format. 0 - lowercase; 1 - uppercase */
var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */
var chrsz = ; /* bits per input character. 8 - ASCII; 16 - Unicode */
/*
* These are the functions you'll usually want to call
* They take string arguments and return either hex or base-64 encoded strings
*/
function hex_md5(s) { return binl2hex(core_md5(str2binl(s), s.length * chrsz)); }
function b64_md5(s) { return binl2b64(core_md5(str2binl(s), s.length * chrsz)); }
function str_md5(s) { return binl2str(core_md5(str2binl(s), s.length * chrsz)); }
function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }
/*
* Perform a simple self-test to see if the VM is working
*/
function md5_vm_test() {
return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}
/*
* Calculate the MD5 of an array of little-endian words, and a bit length
*/
function core_md5(x, len) {
/* append padding */
x[len >> ] |= 0x80 << ((len) % );
x[(((len + ) >>> ) << ) + ] = len;
var a = ;
var b = -;
var c = -;
var d = ;
for (var i = ; i < x.length; i += ) {
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;
a = md5_ff(a, b, c, d, x[i + ], , -);
d = md5_ff(d, a, b, c, x[i + ], , -);
c = md5_ff(c, d, a, b, x[i + ], , );
b = md5_ff(b, c, d, a, x[i + ], , -);
a = md5_ff(a, b, c, d, x[i + ], , -);
d = md5_ff(d, a, b, c, x[i + ], , );
c = md5_ff(c, d, a, b, x[i + ], , -);
b = md5_ff(b, c, d, a, x[i + ], , -);
a = md5_ff(a, b, c, d, x[i + ], , );
d = md5_ff(d, a, b, c, x[i + ], , -);
c = md5_ff(c, d, a, b, x[i + ], , -);
b = md5_ff(b, c, d, a, x[i + ], , -);
a = md5_ff(a, b, c, d, x[i + ], , );
d = md5_ff(d, a, b, c, x[i + ], , -);
c = md5_ff(c, d, a, b, x[i + ], , -);
b = md5_ff(b, c, d, a, x[i + ], , );
a = md5_gg(a, b, c, d, x[i + ], , -);
d = md5_gg(d, a, b, c, x[i + ], , -);
c = md5_gg(c, d, a, b, x[i + ], , );
b = md5_gg(b, c, d, a, x[i + ], , -);
a = md5_gg(a, b, c, d, x[i + ], , -);
d = md5_gg(d, a, b, c, x[i + ], , );
c = md5_gg(c, d, a, b, x[i + ], , -);
b = md5_gg(b, c, d, a, x[i + ], , -);
a = md5_gg(a, b, c, d, x[i + ], , );
d = md5_gg(d, a, b, c, x[i + ], , -);
c = md5_gg(c, d, a, b, x[i + ], , -);
b = md5_gg(b, c, d, a, x[i + ], , );
a = md5_gg(a, b, c, d, x[i + ], , -);
d = md5_gg(d, a, b, c, x[i + ], , -);
c = md5_gg(c, d, a, b, x[i + ], , );
b = md5_gg(b, c, d, a, x[i + ], , -);
a = md5_hh(a, b, c, d, x[i + ], , -);
d = md5_hh(d, a, b, c, x[i + ], , -);
c = md5_hh(c, d, a, b, x[i + ], , );
b = md5_hh(b, c, d, a, x[i + ], , -);
a = md5_hh(a, b, c, d, x[i + ], , -);
d = md5_hh(d, a, b, c, x[i + ], , );
c = md5_hh(c, d, a, b, x[i + ], , -);
b = md5_hh(b, c, d, a, x[i + ], , -);
a = md5_hh(a, b, c, d, x[i + ], , );
d = md5_hh(d, a, b, c, x[i + ], , -);
c = md5_hh(c, d, a, b, x[i + ], , -);
b = md5_hh(b, c, d, a, x[i + ], , );
a = md5_hh(a, b, c, d, x[i + ], , -);
d = md5_hh(d, a, b, c, x[i + ], , -);
c = md5_hh(c, d, a, b, x[i + ], , );
b = md5_hh(b, c, d, a, x[i + ], , -);
a = md5_ii(a, b, c, d, x[i + ], , -);
d = md5_ii(d, a, b, c, x[i + ], , );
c = md5_ii(c, d, a, b, x[i + ], , -);
b = md5_ii(b, c, d, a, x[i + ], , -);
a = md5_ii(a, b, c, d, x[i + ], , );
d = md5_ii(d, a, b, c, x[i + ], , -);
c = md5_ii(c, d, a, b, x[i + ], , -);
b = md5_ii(b, c, d, a, x[i + ], , -);
a = md5_ii(a, b, c, d, x[i + ], , );
d = md5_ii(d, a, b, c, x[i + ], , -);
c = md5_ii(c, d, a, b, x[i + ], , -);
b = md5_ii(b, c, d, a, x[i + ], , );
a = md5_ii(a, b, c, d, x[i + ], , -);
d = md5_ii(d, a, b, c, x[i + ], , -);
c = md5_ii(c, d, a, b, x[i + ], , );
b = md5_ii(b, c, d, a, x[i + ], , -);
a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
}
return Array(a, b, c, d);
}
/*
* These functions implement the four basic operations the algorithm uses.
*/
function md5_cmn(q, a, b, x, s, t) {
return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
}
function md5_ff(a, b, c, d, x, s, t) {
return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t) {
return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t) {
return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t) {
return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}
/*
* Calculate the HMAC-MD5, of a key and some data
*/
function core_hmac_md5(key, data) {
var bkey = str2binl(key);
if (bkey.length > ) bkey = core_md5(bkey, key.length * chrsz);
var ipad = Array(), opad = Array();
for (var i = ; i < ; i++) {
ipad[i] = bkey[i] ^ 0x36363636;
opad[i] = bkey[i] ^ 0x5C5C5C5C;
}
var hash = core_md5(ipad.concat(str2binl(data)), + data.length * chrsz);
return core_md5(opad.concat(hash), + );
}
/*
* Add integers, wrapping at 2^32. This uses 16-bit operations internally
* to work around bugs in some JS interpreters.
*/
function safe_add(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> ) + (y >> ) + (lsw >> );
return (msw << ) | (lsw & 0xFFFF);
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
function bit_rol(num, cnt) {
return (num << cnt) | (num >>> ( - cnt));
}
/*
* Convert a string to an array of little-endian words
* If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
*/
function str2binl(str) {
var bin = Array();
var mask = ( << chrsz) - ;
for (var i = ; i < str.length * chrsz; i += chrsz)
bin[i >> ] |= (str.charCodeAt(i / chrsz) & mask) << (i % );
return bin;
}
/*
* Convert an array of little-endian words to a string
*/
function binl2str(bin) {
var str = "";
var mask = ( << chrsz) - ;
for (var i = ; i < bin.length * ; i += chrsz)
str += String.fromCharCode((bin[i >> ] >>> (i % )) & mask);
return str;
}
/*
* Convert an array of little-endian words to a hex string.
*/
function binl2hex(binarray) {
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var str = "";
for (var i = ; i < binarray.length * ; i++) {
str += hex_tab.charAt((binarray[i >> ] >> ((i % ) * + )) & 0xF) +
hex_tab.charAt((binarray[i >> ] >> ((i % ) * )) & 0xF);
}
return str;
}
/*
* Convert an array of little-endian words to a base-64 string
*/
function binl2b64(binarray) {
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
for (var i = ; i < binarray.length * ; i += ) {
var triplet = (((binarray[i >> ] >> * (i % )) & 0xFF) << )
| (((binarray[i + >> ] >> * ((i + ) % )) & 0xFF) << )
| ((binarray[i + >> ] >> * ((i + ) % )) & 0xFF);
for (var j = ; j < ; j++) {
if (i * + j * > binarray.length * ) str += b64pad;
else str += tab.charAt((triplet >> * ( - j)) & 0x3F);
}
}
return str;
}
module.exports = {
MD5: hex_md5
}

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