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local Array = include("array.lua");
local Stream = include("stream.lua");
local Queue = include("queue.lua");
local Bit = include("bit.lua");
local CBC = {};
CBC.Cipher = function()
local public = {};
local key;
local blockCipher;
local padding;
local inputQueue;
local outputQueue;
local iv;
public.setKey = function(keyBytes)
print("Set key to:")
print(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)
print("Entering update")
local byte = messageStream();
while (byte ~= nil) do
print("processing byte")
inputQueue.push(byte);
print("inputQueue.size is:" .. inputQueue.size())
print("blockCipher.blockSize:" .. blockCipher.blockSize)
if(inputQueue.size() >= blockCipher.blockSize) then
print("reading from queue")
local block = Array.readFromQueue(inputQueue,blockCipher.blockSize);
if(iv == nil) then
print("iv was nil, iv is now")
iv = block;
PrintTable(block)
else
print("iv was not nil, doing thing")
local out = Array.XOR(iv,block);
print("Calling encrypt with key:")
print(key)
print("and out")
print(out)
out = blockCipher.encrypt(key,out);
print("Out was:")
print(out)
Array.writeToQueue(outputQueue,out);
iv = out;
end
end
byte = messageStream();
end
print("Before update returned, blockCipher was ")
PrintTable(blockCipher)
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()
print("Outputqueue is:")
PrintTable(outputQueue)
return Stream.toHex(outputQueue.pop);
end
public.asBytes = function()
return Stream.toArray(outputQueue.pop);
end
return public;
end
CBC.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)
print("Updateing decipher with 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;
print("Setting iv to ")
PrintTable(iv)
else
local out = block;
out = blockCipher.decrypt(key,out);
out = Array.XOR(iv,out);
Array.writeToQueue(outputQueue,out);
iv = block;
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
public.asString = function()
return Stream.toString(outputQueue.pop)
end
return public;
end
return CBC;
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