iflow描述文件调优

wxcomponents/painter/lib/sha1.js

@@ -0,0 +1,97 @@
+var hexcase = 0;
+var chrsz = 8;
+
+function hex_sha1(s) {
+  return binb2hex(core_sha1(str2binb(s), s.length * chrsz));
+}
+
+function core_sha1(x, len) {
+  x[len >> 5] |= 0x80 << (24 - (len % 32));
+  x[(((len + 64) >> 9) << 4) + 15] = len;
+
+  var w = 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 Array(a, b, c, d, e);
+}
+
+function sha1_ft(t, b, c, d) {
+  if (t < 20) return (b & c) | (~b & d);
+  if (t < 40) return b ^ c ^ d;
+  if (t < 60) return (b & c) | (b & d) | (c & d);
+  return b ^ c ^ d;
+}
+
+function sha1_kt(t) {
+  return t < 20
+    ? 1518500249
+    : t < 40
+    ? 1859775393
+    : t < 60
+    ? -1894007588
+    : -899497514;
+}
+
+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 str2binb(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) << (24 - (i % 32));
+  return bin;
+}
+
+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;
+}
+
+module.exports = {
+  hex_sha1,
+}