File size: 3,102 Bytes
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local Array = require("lockbox.util.array");
local Stream = require("lockbox.util.stream");
local Queue = require("lockbox.util.queue");
local String = require("string");
local Bit = require("lockbox.util.bit");
local OFB = {};
OFB.Cipher = function()
local public = {};
local key;
local blockCipher;
local padding;
local inputQueue;
local outputQueue;
local iv;
public.setKey = function(keyBytes)
key = keyBytes;
return public;
end
public.setBlockCipher = function(cipher)
blockCipher = cipher;
return public;
end
public.setPadding = function(paddingMode)
padding = paddingMode;
return public;
end
public.init = function()
inputQueue = Queue();
outputQueue = Queue();
iv = nil;
return public;
end
public.update = function(messageStream)
local byte = messageStream();
while (byte ~= nil) do
inputQueue.push(byte);
if(inputQueue.size() >= blockCipher.blockSize) then
local block = Array.readFromQueue(inputQueue,blockCipher.blockSize);
if(iv == nil) then
iv = block;
else
local out = iv;
out = blockCipher.encrypt(key,out);
iv = out;
out = Array.XOR(out,block);
Array.writeToQueue(outputQueue,out);
end
end
byte = messageStream();
end
return public;
end
public.finish = function()
paddingStream = padding(blockCipher.blockSize,inputQueue.getHead());
public.update(paddingStream);
return public;
end
public.getOutputQueue = function()
return outputQueue;
end
public.asHex = function()
return Stream.toHex(outputQueue.pop);
end
public.asBytes = function()
return Stream.toArray(outputQueue.pop);
end
return public;
end
OFB.Decipher = function()
local public = {};
local key;
local blockCipher;
local padding;
local inputQueue;
local outputQueue;
local iv;
public.setKey = function(keyBytes)
key = keyBytes;
return public;
end
public.setBlockCipher = function(cipher)
blockCipher = cipher;
return public;
end
public.setPadding = function(paddingMode)
padding = paddingMode;
return public;
end
public.init = function()
inputQueue = Queue();
outputQueue = Queue();
iv = nil;
return public;
end
public.update = function(messageStream)
local byte = messageStream();
while (byte ~= nil) do
inputQueue.push(byte);
if(inputQueue.size() >= blockCipher.blockSize) then
local block = Array.readFromQueue(inputQueue,blockCipher.blockSize);
if(iv == nil) then
iv = block;
else
local out = iv;
out = blockCipher.encrypt(key,out);
iv = out;
out = Array.XOR(out,block);
Array.writeToQueue(outputQueue,out);
end
end
byte = messageStream();
end
return public;
end
public.finish = function()
paddingStream = padding(blockCipher.blockSize,inputQueue.getHead());
public.update(paddingStream);
return public;
end
public.getOutputQueue = function()
return outputQueue;
end
public.asHex = function()
return Stream.toHex(outputQueue.pop);
end
public.asBytes = function()
return Stream.toArray(outputQueue.pop);
end
return public;
end
return OFB;
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