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local Bit = require("lockbox.util.bit");
local String = require("string");
local Array = require("lockbox.util.array");
local Stream = require("lockbox.util.stream");
local Math = require("math");
local AND = Bit.band;
local OR = Bit.bor;
local NOT = Bit.bnot;
local XOR = Bit.bxor;
local LROT = Bit.lrotate;
local RROT = Bit.rrotate;
local LSHIFT = Bit.lshift;
local RSHIFT = Bit.rshift;
--PBKDF2 is big-endian
local bytes2word = function(b0,b1,b2,b3)
local i = b0; i = LSHIFT(i,8);
i = OR(i,b1); i = LSHIFT(i,8);
i = OR(i,b2); i = LSHIFT(i,8);
i = OR(i,b3);
return i;
end
local word2bytes = function(word)
local b0,b1,b2,b3;
b3 = AND(word,0xFF); word = RSHIFT(word,8);
b2 = AND(word,0xFF); word = RSHIFT(word,8);
b1 = AND(word,0xFF); word = RSHIFT(word,8);
b0 = AND(word,0xFF);
return b0,b1,b2,b3;
end
local bytes2dword = function(b0,b1,b2,b3,b4,b5,b6,b7)
local i = bytes2word(b0,b1,b2,b3);
local j = bytes2word(b4,b5,b6,b7);
return (i*0x100000000)+j;
end
local dword2bytes = function(i)
local b4,b5,b6,b7 = word2bytes(i);
local b0,b1,b2,b3 = word2bytes(i/0x100000000);
return b0,b1,b2,b3,b4,b5,b6,b7;
end
local PBKDF2 = function()
local public = {};
local blockLen = 16;
local dKeyLen = 256;
local iterations = 4096;
local salt;
local password;
local PRF;
local dKey;
public.setBlockLen = function(len)
blockLen = len;
return public;
end
public.setDKeyLen = function(len)
dKeyLen = len
return public;
end
public.setIterations = function(iter)
iterations = iter;
return public;
end
public.setSalt = function(saltBytes)
salt = saltBytes;
return public;
end
public.setPassword = function(passwordBytes)
password = passwordBytes;
return public;
end
public.setPRF = function(prf)
PRF = prf;
return public;
end
local buildBlock = function(i)
local b0,b1,b2,b3 = word2bytes(i);
local ii = {b0,b1,b2,b3};
local s = Array.concat(salt,ii);
local out = {};
PRF.setKey(password);
for c = 1,iterations do
PRF.init()
.update(Stream.fromArray(s));
s = PRF.finish().asBytes();
if(c > 1) then
out = Array.XOR(out,s);
else
out = s;
end
end
return out;
end
public.finish = function()
local blocks = Math.ceil(dKeyLen / blockLen);
dKey = {};
for b = 1, blocks do
local block = buildBlock(b);
dKey = Array.concat(dKey,block);
end
if(Array.size(dKey) > dKeyLen) then dKey = Array.truncate(dKey,dKeyLen); end
return public;
end
public.asBytes = function()
return dKey;
end
public.asHex = function()
return Array.toHex(dKey);
end
return public;
end
return PBKDF2;
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