"use strict";

// Tables, permutations, S-boxes, etc.

// jshint -W013

var PC2 = [13,16,10,23, 0, 4, 2,27,14, 5,20, 9,22,18,11, 3,

25, 7,15, 6,26,19,12, 1,40,51,30,36,46,54,29,39,

50,44,32,47,43,48,38,55,33,52,45,41,49,35,28,31 ],

totrot = [ 1, 2, 4, 6, 8,10,12,14,15,17,19,21,23,25,27,28],

z = 0x0, a,b,c,d,e,f, SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,

keys = [];

// jshint -W015

a=1<<16; b=1<<24; c=a|b; d=1<<2; e=1<<10; f=d|e;

SP1 = [c|e,z|z,a|z,c|f,c|d,a|f,z|d,a|z,z|e,c|e,c|f,z|e,b|f,c|d,b|z,z|d,

z|f,b|e,b|e,a|e,a|e,c|z,c|z,b|f,a|d,b|d,b|d,a|d,z|z,z|f,a|f,b|z,

a|z,c|f,z|d,c|z,c|e,b|z,b|z,z|e,c|d,a|z,a|e,b|d,z|e,z|d,b|f,a|f,

c|f,a|d,c|z,b|f,b|d,z|f,a|f,c|e,z|f,b|e,b|e,z|z,a|d,a|e,z|z,c|d];

a=1<<20; b=1<<31; c=a|b; d=1<<5; e=1<<15; f=d|e;

SP2 = [c|f,b|e,z|e,a|f,a|z,z|d,c|d,b|f,b|d,c|f,c|e,b|z,b|e,a|z,z|d,c|d,

a|e,a|d,b|f,z|z,b|z,z|e,a|f,c|z,a|d,b|d,z|z,a|e,z|f,c|e,c|z,z|f,

z|z,a|f,c|d,a|z,b|f,c|z,c|e,z|e,c|z,b|e,z|d,c|f,a|f,z|d,z|e,b|z,

z|f,c|e,a|z,b|d,a|d,b|f,b|d,a|d,a|e,z|z,b|e,z|f,b|z,c|d,c|f,a|e];

a=1<<17; b=1<<27; c=a|b; d=1<<3; e=1<<9; f=d|e;

SP3 = [z|f,c|e,z|z,c|d,b|e,z|z,a|f,b|e,a|d,b|d,b|d,a|z,c|f,a|d,c|z,z|f,

b|z,z|d,c|e,z|e,a|e,c|z,c|d,a|f,b|f,a|e,a|z,b|f,z|d,c|f,z|e,b|z,

c|e,b|z,a|d,z|f,a|z,c|e,b|e,z|z,z|e,a|d,c|f,b|e,b|d,z|e,z|z,c|d,

b|f,a|z,b|z,c|f,z|d,a|f,a|e,b|d,c|z,b|f,z|f,c|z,a|f,z|d,c|d,a|e];

a=1<<13; b=1<<23; c=a|b; d=1<<0; e=1<<7; f=d|e;

SP4 = [c|d,a|f,a|f,z|e,c|e,b|f,b|d,a|d,z|z,c|z,c|z,c|f,z|f,z|z,b|e,b|d,

z|d,a|z,b|z,c|d,z|e,b|z,a|d,a|e,b|f,z|d,a|e,b|e,a|z,c|e,c|f,z|f,

b|e,b|d,c|z,c|f,z|f,z|z,z|z,c|z,a|e,b|e,b|f,z|d,c|d,a|f,a|f,z|e,

c|f,z|f,z|d,a|z,b|d,a|d,c|e,b|f,a|d,a|e,b|z,c|d,z|e,b|z,a|z,c|e];

a=1<<25; b=1<<30; c=a|b; d=1<<8; e=1<<19; f=d|e;

SP5 = [z|d,a|f,a|e,c|d,z|e,z|d,b|z,a|e,b|f,z|e,a|d,b|f,c|d,c|e,z|f,b|z,

a|z,b|e,b|e,z|z,b|d,c|f,c|f,a|d,c|e,b|d,z|z,c|z,a|f,a|z,c|z,z|f,

z|e,c|d,z|d,a|z,b|z,a|e,c|d,b|f,a|d,b|z,c|e,a|f,b|f,z|d,a|z,c|e,

c|f,z|f,c|z,c|f,a|e,z|z,b|e,c|z,z|f,a|d,b|d,z|e,z|z,b|e,a|f,b|d];

a=1<<22; b=1<<29; c=a|b; d=1<<4; e=1<<14; f=d|e;

SP6 = [b|d,c|z,z|e,c|f,c|z,z|d,c|f,a|z,b|e,a|f,a|z,b|d,a|d,b|e,b|z,z|f,

z|z,a|d,b|f,z|e,a|e,b|f,z|d,c|d,c|d,z|z,a|f,c|e,z|f,a|e,c|e,b|z,

b|e,z|d,c|d,a|e,c|f,a|z,z|f,b|d,a|z,b|e,b|z,z|f,b|d,c|f,a|e,c|z,

a|f,c|e,z|z,c|d,z|d,z|e,c|z,a|f,z|e,a|d,b|f,z|z,c|e,b|z,a|d,b|f];

a=1<<21; b=1<<26; c=a|b; d=1<<1; e=1<<11; f=d|e;

SP7 = [a|z,c|d,b|f,z|z,z|e,b|f,a|f,c|e,c|f,a|z,z|z,b|d,z|d,b|z,c|d,z|f,

b|e,a|f,a|d,b|e,b|d,c|z,c|e,a|d,c|z,z|e,z|f,c|f,a|e,z|d,b|z,a|e,

b|z,a|e,a|z,b|f,b|f,c|d,c|d,z|d,a|d,b|z,b|e,a|z,c|e,z|f,a|f,c|e,

z|f,b|d,c|f,c|z,a|e,z|z,z|d,c|f,z|z,a|f,c|z,z|e,b|d,b|e,z|e,a|d];

a=1<<18; b=1<<28; c=a|b; d=1<<6; e=1<<12; f=d|e;

SP8 = [b|f,z|e,a|z,c|f,b|z,b|f,z|d,b|z,a|d,c|z,c|f,a|e,c|e,a|f,z|e,z|d,

c|z,b|d,b|e,z|f,a|e,a|d,c|d,c|e,z|f,z|z,z|z,c|d,b|d,b|e,a|f,a|z,

a|f,a|z,c|e,z|e,z|d,c|d,z|e,a|f,b|e,z|d,b|d,c|z,c|d,b|z,a|z,b|f,

z|z,c|f,a|d,b|d,c|z,b|e,b|f,z|z,c|f,a|e,a|e,z|f,z|f,a|d,b|z,c|e];

// jshint +W013,+W015

// Set the key.

function setKeys(keyBlock) {

var i, j, l, m, n, o, pc1m = [], pcr = [], kn = [],

raw0, raw1, rawi, KnLi;

for (j = 0, l = 56; j < 56; ++j, l -= 8) {

l += l < -5 ? 65 : l < -3 ? 31 : l < -1 ? 63 : l === 27 ? 35 : 0; // PC1

m = l & 0x7;

pc1m[j] = ((keyBlock[l >>> 3] & (1<<m)) !== 0) ? 1: 0;

}

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

m = i << 1;

n = m + 1;

kn[m] = kn[n] = 0;

for (o = 28; o < 59; o += 28) {

for (j = o - 28; j < o; ++j) {

l = j + totrot[i];

if (l < o) {

pcr[j] = pc1m[l];

} else {

pcr[j] = pc1m[l - 28];

}

}

}

for (j = 0; j < 24; ++j) {

if (pcr[PC2[j]] !== 0) {

kn[m] |= 1 << (23 - j);

}

if (pcr[PC2[j + 24]] !== 0) {

kn[n] |= 1 << (23 - j);

}

}

}

// cookey

for (i = 0, rawi = 0, KnLi = 0; i < 16; ++i) {

raw0 = kn[rawi++];

raw1 = kn[rawi++];

keys[KnLi] = (raw0 & 0x00fc0000) << 6;

keys[KnLi] |= (raw0 & 0x00000fc0) << 10;

keys[KnLi] |= (raw1 & 0x00fc0000) >>> 10;

keys[KnLi] |= (raw1 & 0x00000fc0) >>> 6;

++KnLi;

keys[KnLi] = (raw0 & 0x0003f000) << 12;

keys[KnLi] |= (raw0 & 0x0000003f) << 16;

keys[KnLi] |= (raw1 & 0x0003f000) >>> 4;

keys[KnLi] |= (raw1 & 0x0000003f);

++KnLi;

}

}

// Encrypt 8 bytes of text

function enc8(text) {

var i = 0, b = text.slice(), fval, keysi = 0,

l, r, x; // left, right, accumulator

// Squash 8 bytes to 2 ints

l = b[i++]<<24 | b[i++]<<16 | b[i++]<<8 | b[i++];

r = b[i++]<<24 | b[i++]<<16 | b[i++]<<8 | b[i++];

x = ((l >>> 4) ^ r) & 0x0f0f0f0f;

r ^= x;

l ^= (x << 4);

x = ((l >>> 16) ^ r) & 0x0000ffff;

r ^= x;

l ^= (x << 16);

x = ((r >>> 2) ^ l) & 0x33333333;

l ^= x;

r ^= (x << 2);

x = ((r >>> 8) ^ l) & 0x00ff00ff;

l ^= x;

r ^= (x << 8);

r = (r << 1) | ((r >>> 31) & 1);

x = (l ^ r) & 0xaaaaaaaa;

l ^= x;

r ^= x;

l = (l << 1) | ((l >>> 31) & 1);

for (i = 0; i < 8; ++i) {

x = (r << 28) | (r >>> 4);

x ^= keys[keysi++];

fval = SP7[x & 0x3f];

fval |= SP5[(x >>> 8) & 0x3f];

fval |= SP3[(x >>> 16) & 0x3f];

fval |= SP1[(x >>> 24) & 0x3f];

x = r ^ keys[keysi++];

fval |= SP8[x & 0x3f];

fval |= SP6[(x >>> 8) & 0x3f];

fval |= SP4[(x >>> 16) & 0x3f];

fval |= SP2[(x >>> 24) & 0x3f];

l ^= fval;

x = (l << 28) | (l >>> 4);

x ^= keys[keysi++];

fval = SP7[x & 0x3f];

fval |= SP5[(x >>> 8) & 0x3f];

fval |= SP3[(x >>> 16) & 0x3f];

fval |= SP1[(x >>> 24) & 0x3f];

x = l ^ keys[keysi++];

fval |= SP8[x & 0x0000003f];

fval |= SP6[(x >>> 8) & 0x3f];

fval |= SP4[(x >>> 16) & 0x3f];

fval |= SP2[(x >>> 24) & 0x3f];

r ^= fval;

}

r = (r << 31) | (r >>> 1);

x = (l ^ r) & 0xaaaaaaaa;

l ^= x;

r ^= x;

l = (l << 31) | (l >>> 1);

x = ((l >>> 8) ^ r) & 0x00ff00ff;

r ^= x;

l ^= (x << 8);

x = ((l >>> 2) ^ r) & 0x33333333;

r ^= x;

l ^= (x << 2);

x = ((r >>> 16) ^ l) & 0x0000ffff;

l ^= x;

r ^= (x << 16);

x = ((r >>> 4) ^ l) & 0x0f0f0f0f;

l ^= x;

r ^= (x << 4);

// Spread ints to bytes

x = [r, l];

for (i = 0; i < 8; i++) {

b[i] = (x[i>>>2] >>> (8 * (3 - (i % 4)))) % 256;

if (b[i] < 0) { b[i] += 256; } // unsigned

}

return b;

}

// Encrypt 16 bytes of text using passwd as key

function encrypt(t) {

return enc8(t.slice(0, 8)).concat(enc8(t.slice(8, 16)));

}

setKeys(passwd); // Setup keys

return {'encrypt': encrypt}; // Public interface