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#!/usr/bin/env node
// makekeccak.js
// Tim Hughes <tim@twistedfury.com>
/*jslint node: true, shadow:true */
"use strict";
var Keccak_f1600_Rho = [
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14,
27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44
];
var Keccak_f1600_Pi= [
10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4,
15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1
];
var Keccak_f1600_RC = [
0x00000001, 0x00000000,
0x00008082, 0x00000000,
0x0000808a, 0x80000000,
0x80008000, 0x80000000,
0x0000808b, 0x00000000,
0x80000001, 0x00000000,
0x80008081, 0x80000000,
0x00008009, 0x80000000,
0x0000008a, 0x00000000,
0x00000088, 0x00000000,
0x80008009, 0x00000000,
0x8000000a, 0x00000000,
0x8000808b, 0x00000000,
0x0000008b, 0x80000000,
0x00008089, 0x80000000,
0x00008003, 0x80000000,
0x00008002, 0x80000000,
0x00000080, 0x80000000,
0x0000800a, 0x00000000,
0x8000000a, 0x80000000,
0x80008081, 0x80000000,
0x00008080, 0x80000000,
0x80000001, 0x00000000,
0x80008008, 0x80000000,
];
function makeRotLow(lo, hi, n)
{
if (n === 0 || n === 32) throw Error("unsupported");
if ((n & 0x20) !== 0)
{
n &= ~0x20;
var t = hi;
hi = lo;
lo = t;
}
var hir = hi + " >>> " + (32 - n);
var los = lo + " << " + n;
return los + " | " + hir;
}
function makeRotHigh(lo, hi, n)
{
if (n === 0 || n === 32) throw Error("unsupported");
if ((n & 0x20) !== 0)
{
n &= ~0x20;
var t = hi;
hi = lo;
lo = t;
}
var his = hi + " << " + n;
var lor = lo + " >>> " + (32 - n);
return his + " | " + lor;
}
function makeKeccak_f1600()
{
var format = function(n)
{
return n < 10 ? "0"+n : ""+n;
};
var a = function(n, w)
{
return "a" + format(n) + (w !== 0?'h':'l');
};
var b = function(n, w)
{
return "b" + format(n) + (w !== 0?'h':'l');
};
var str = "";
str += "function keccak_f1600(outState, outOffset, outSize, inState)\n";
str += "{\n";
for (var i = 0; i < 25; ++i)
{
for (var w = 0; w <= 1; ++w)
{
str += "\tvar " + a(i,w) + " = inState["+(i<<1|w)+"]|0;\n";
}
}
for (var j = 0; j < 5; ++j)
{
str += "\tvar ";
for (var i = 0; i < 5; ++i)
{
if (i !== 0)
str += ", ";
str += b(j*5+i,0) + ", " + b(j*5+i,1);
}
str += ";\n";
}
str += "\tvar tl, th;\n";
str += "\n";
str += "\tfor (var r = 0; r < 48; r = (r+2)|0)\n";
str += "\t{\n";
// Theta
str += "\t\t// Theta\n";
for (var i = 0; i < 5; ++i)
{
for (var w = 0; w <= 1; ++w)
{
str += "\t\t" + b(i,w) + " = " + a(i,w) + " ^ " + a(i+5,w) + " ^ " + a(i+10,w) + " ^ " + a(i+15,w) + " ^ " + a(i+20,w) + ";\n";
}
}
for (var i = 0; i < 5; ++i)
{
var i4 = (i + 4) % 5;
var i1 = (i + 1) % 5;
str += "\t\ttl = " + b(i4,0) + " ^ (" + b(i1,0) + " << 1 | " + b(i1,1) + " >>> 31);\n";
str += "\t\tth = " + b(i4,1) + " ^ (" + b(i1,1) + " << 1 | " + b(i1,0) + " >>> 31);\n";
for (var j = 0; j < 25; j = (j+5)|0)
{
str += "\t\t" + a((j+i),0) + " ^= tl;\n";
str += "\t\t" + a((j+i),1) + " ^= th;\n";
}
}
// Rho Pi
str += "\n\t\t// Rho Pi\n";
for (var w = 0; w <= 1; ++w)
{
str += "\t\t" + b(0,w) + " = " + a(0,w) + ";\n";
}
var opi = 1;
for (var i = 0; i < 24; ++i)
{
var pi = Keccak_f1600_Pi[i];
str += "\t\t" + b(pi,0) + " = " + makeRotLow(a(opi,0), a(opi,1), Keccak_f1600_Rho[i]) + ";\n";
str += "\t\t" + b(pi,1) + " = " + makeRotHigh(a(opi,0), a(opi,1), Keccak_f1600_Rho[i]) + ";\n";
opi = pi;
}
// Chi
str += "\n\t\t// Chi\n";
for (var j = 0; j < 25; j += 5)
{
for (var i = 0; i < 5; ++i)
{
for (var w = 0; w <= 1; ++w)
{
str += "\t\t" + a(j+i,w) + " = " + b(j+i,w) + " ^ ~" + b(j+(i+1)%5,w) + " & " + b(j+(i+2)%5,w) + ";\n";
}
}
}
// Iota
str += "\n\t\t// Iota\n";
for (var w = 0; w <= 1; ++w)
{
str += "\t\t" + a(0,w) + " ^= Keccak_f1600_RC[r|" + w + "];\n";
}
str += "\t}\n";
for (var i = 0; i < 25; ++i)
{
if (i == 4 || i == 8)
{
str += "\tif (outSize == " + i*2 + ")\n\t\treturn;\n";
}
for (var w = 0; w <= 1; ++w)
{
str += "\toutState[outOffset|"+(i<<1|w)+"] = " + a(i,w) + ";\n";
}
}
str += "}\n";
return str;
}
console.log(makeKeccak_f1600());
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