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前端js实现微信签名算法.md

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<html>
<head>
<script type="text/javascript">
var chrsz = 8;
var hexcase = 0;
var b64pad = '';
function getSign(inJsTicket, inNoncestr, inTimestamp, url) {
    var str = 'jsapi_ticket=' + inJsTicket + '&noncestr=' + inNoncestr + '&timestamp=' +
            inTimestamp + '&url=' + url;
    var signature = hexSha1(str);
    return signature;
}
function hexSha1(s) {
    return binb2hex(core_sha1(str2binb(s), s.length * chrsz));
}
function binb2hex(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] >> ((3 - i % 4) * 8 + 4)) & 0xF) + hex_tab.charAt((binarray[i >> 2] >> ((3 - i % 4) * 8)) & 0xF);
    }
    return str;
}
function str2binb(str) {
    var bin = [];
    var mask = (1 << chrsz) - 1;
    for (var i = 0; i < str.length * chrsz; i += chrsz) {
        bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i % 32);
    }
    return bin;
}
function core_sha1(x, len) {
    /*   append   padding   */
    x[len >> 5] |= 0x80 << (24 - len % 32);
    x[((len + 64 >> 9) << 4) + 15] = len;
    var w = new Array(80);
    var a = 1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d = 271733878;
    var e = -1009589776;
    for (var i = 0; i < x.length; i += 16) {
        var olda = a;
        var oldb = b;
        var oldc = c;
        var oldd = d;
        var olde = e;
        for (var j = 0; j < 80; j++) {
            if (j < 16) {
                w[j] = x[i + j];
            } else {
                w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
            }
            var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j)));
            e = d;
            d = c;
            c = rol(b, 30);
            b = a;
            a = t;
        }
        a = safe_add(a, olda);
        b = safe_add(b, oldb);
        c = safe_add(c, oldc);
        d = safe_add(d, oldd);
        e = safe_add(e, olde);
    }
    return [a, b, c, d, e];
}
function safe_add(x, y) {
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF);
}
function rol(num, cnt) {
    return (num << cnt) | (num >>> (32 - cnt));
}
function sha1_kt(t) {
    return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514;
}
function sha1_ft(t, b, c, d) {
    if (t < 20) {
        return (b & c) | ((~b) & d);
    } else if (t < 40) {
        return b ^ c ^ d;
    } else if (t < 60) {
        return (b & c) | (b & d) | (c & d);
    } else {
        return b ^ c ^ d;
    }
}
var signStr = getSign('ticket', 'abcdefghijklmnop', '1506304549', 'http://abc.com');
document.write(signStr);
// https://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign
// af23c80b33b2420eb52bcb60f99f62f9b40cddd2
</script>
</head>
<body>
</body>
</html>