// Adapted from Chris Veness' SHA1 code at
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// http://www.movable-type.co.uk/scripts/sha1.html
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'use strict';
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function f(s, x, y, z) {
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switch (s) {
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case 0: return (x & y) ^ (~x & z);
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case 1: return x ^ y ^ z;
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case 2: return (x & y) ^ (x & z) ^ (y & z);
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case 3: return x ^ y ^ z;
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}
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}
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function ROTL(x, n) {
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return (x << n) | (x>>> (32 - n));
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}
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function sha1(bytes) {
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var K = [0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6];
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var H = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0];
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if (typeof(bytes) == 'string') {
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var msg = unescape(encodeURIComponent(bytes)); // UTF8 escape
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bytes = new Array(msg.length);
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for (var i = 0; i < msg.length; i++) bytes[i] = msg.charCodeAt(i);
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}
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bytes.push(0x80);
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var l = bytes.length/4 + 2;
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var N = Math.ceil(l/16);
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var M = new Array(N);
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for (var i=0; i<N; i++) {
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M[i] = new Array(16);
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for (var j=0; j<16; j++) {
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M[i][j] =
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bytes[i * 64 + j * 4] << 24 |
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bytes[i * 64 + j * 4 + 1] << 16 |
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bytes[i * 64 + j * 4 + 2] << 8 |
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bytes[i * 64 + j * 4 + 3];
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}
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}
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M[N - 1][14] = ((bytes.length - 1) * 8) /
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Math.pow(2, 32); M[N - 1][14] = Math.floor(M[N - 1][14]);
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M[N - 1][15] = ((bytes.length - 1) * 8) & 0xffffffff;
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for (var i=0; i<N; i++) {
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var W = new Array(80);
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for (var t=0; t<16; t++) W[t] = M[i][t];
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for (var t=16; t<80; t++) {
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W[t] = ROTL(W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16], 1);
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}
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var a = H[0];
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var b = H[1];
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var c = H[2];
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var d = H[3];
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var e = H[4];
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for (var t=0; t<80; t++) {
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var s = Math.floor(t/20);
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var T = ROTL(a, 5) + f(s, b, c, d) + e + K[s] + W[t] >>> 0;
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e = d;
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d = c;
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c = ROTL(b, 30) >>> 0;
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b = a;
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a = T;
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}
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H[0] = (H[0] + a) >>> 0;
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H[1] = (H[1] + b) >>> 0;
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H[2] = (H[2] + c) >>> 0;
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H[3] = (H[3] + d) >>> 0;
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H[4] = (H[4] + e) >>> 0;
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}
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return [
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H[0] >> 24 & 0xff, H[0] >> 16 & 0xff, H[0] >> 8 & 0xff, H[0] & 0xff,
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H[1] >> 24 & 0xff, H[1] >> 16 & 0xff, H[1] >> 8 & 0xff, H[1] & 0xff,
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H[2] >> 24 & 0xff, H[2] >> 16 & 0xff, H[2] >> 8 & 0xff, H[2] & 0xff,
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H[3] >> 24 & 0xff, H[3] >> 16 & 0xff, H[3] >> 8 & 0xff, H[3] & 0xff,
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H[4] >> 24 & 0xff, H[4] >> 16 & 0xff, H[4] >> 8 & 0xff, H[4] & 0xff
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];
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}
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module.exports = sha1;
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