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require("lockbox").insecure();
local Array = require("lockbox.util.array");
local DES = require("lockbox.cipher.des");
local DES3 = {};
local getKeys = function(keyBlock)
local size = Array.size(keyBlock)
local key1;
local key2;
local key3;
if (size == 8) then
key1 = keyBlock;
key2 = keyBlock;
key3 = keyBlock;
elseif (size == 16) then
key1 = Array.slice(keyBlock,1,8);
key2 = Array.slice(keyBlock,9,16);
key3 = key1;
elseif (size == 24) then
key1 = Array.slice(keyBlock,1,8);
key2 = Array.slice(keyBlock,9,16);
key3 = Array.slice(keyBlock,17,24);
else
assert(false,"Invalid key size for 3DES");
end
return key1,key2,key3;
end
DES3.blockSize = DES.blockSize;
DES3.encrypt = function(keyBlock,inputBlock)
local key1;
local key2;
local key3;
key1, key2, key3 = getKeys(keyBlock);
local block = inputBlock;
block = DES.encrypt(key1,block);
block = DES.decrypt(key2,block);
block = DES.encrypt(key3,block);
return block;
end
DES3.decrypt = function(keyBlock,inputBlock)
local key1;
local key2;
local key3;
key1, key2, key3 = getKeys(keyBlock);
local block = inputBlock;
block = DES.decrypt(key3,block);
block = DES.encrypt(key2,block);
block = DES.decrypt(key1,block);
return block;
end
return DES3;
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