File size: 1,606 Bytes
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local Bit = require("lockbox.util.bit");
local String = require("string");
local Stream = require("lockbox.util.stream");
local Array = require("lockbox.util.array");
local XOR = Bit.bxor;
local HMAC = function()
local public = {};
local blockSize = 64;
local Digest = nil;
local outerPadding = {};
local innerPadding = {}
local digest;
public.setBlockSize = function(bytes)
blockSize = bytes;
return public;
end
public.setDigest = function(digestModule)
Digest = digestModule;
digest = Digest();
return public;
end
public.setKey = function(key)
local keyStream;
if(Array.size(key) > blockSize) then
keyStream = Stream.fromArray(Digest()
.update(Stream.fromArray(key))
.finish()
.asBytes());
else
keyStream = Stream.fromArray(key);
end
outerPadding = {};
innerPadding = {};
for i=1,blockSize do
local byte = keyStream();
if byte == nil then byte = 0x00; end
outerPadding[i] = XOR(0x5C,byte);
innerPadding[i] = XOR(0x36,byte);
end
return public;
end
public.init = function()
digest .init()
.update(Stream.fromArray(innerPadding));
return public;
end
public.update = function(messageStream)
digest.update(messageStream);
return public;
end
public.finish = function()
local inner = digest.finish().asBytes();
digest .init()
.update(Stream.fromArray(outerPadding))
.update(Stream.fromArray(inner))
.finish();
return public;
end
public.asBytes = function()
return digest.asBytes();
end
public.asHex = function()
return digest.asHex();
end
return public;
end
return HMAC;
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