public string Upload(string path, string filename, string key, int alg)
{
try
{
byte[] f = File.ReadAllBytes(path);
StoredFile sf = new StoredFile();
sf.username = Username;
sf.filename = filename;
sf.hash = MD5.HashString(f);
switch (alg)
{
case 0:
sf.data = DoubleTransposition.Encrypt(f, key, sf.hash);
sf.size = sf.data.Length;
break;
case 1:
sf.data = XTEA.Encrypt(f, key, sf.hash);
sf.size = sf.data.Length;
break;
default: throw new Exception("You have not chosen an algorithm.");
}
svc.Upload(Username, sf, Token);
Refresh();
return("File successfuly uploaded.");
}
catch (Exception e)
{
return(e.Message);
}
}
public string Download(string filename, string key, int alg, Download form)
{
try
{
StoredFile sf = svc.Download(Username, filename, Token);
byte[] f;
switch (alg)
{
case 0: f = DoubleTransposition.Decrypt(sf.data, key, sf.hash); break;
case 1: f = XTEA.Decrypt(sf.data, key, sf.hash); break;
default: throw new Exception("You have not chosen an algorithm.");
}
form.Save(filename, f);
return("File successfuly downloaded.");
}
catch (Exception e)
{
return(e.Message);
}
}
private static void Initialize()
{
// Initializing objects used for encryption
if (CypherDoubleTransposition == null)
{
CypherDoubleTransposition = new DoubleTransposition();
}
if (CypherXTEA == null)
{
CypherXTEA = new XTEA();
}
if (CypherKnapsack == null)
{
CypherKnapsack = new Knapsack();
}
if (CypherMD5 == null)
{
CypherMD5 = new MD5();
}
// Initializing algorithm dictionary
if (EncryptionDictionary == null)
{
EncryptionDictionary
= new Dictionary <int, Func <byte[], byte[]> >()
{
// Encryption methods
{ (int)Algorithm.DoubleTranposition, CypherDoubleTransposition.Crypt },
{ (int)Algorithm.XTEA, CypherXTEA.Crypt },
{ (int)Algorithm.Knapsack, CypherKnapsack.Crypt },
{ (int)Algorithm.MD5, CypherMD5.Crypt },
// Decryption methods, enum value + number of algorithms
{ (int)Algorithm.DoubleTranposition + AlgoNumber, CypherDoubleTransposition.Decrypt },
{ (int)Algorithm.XTEA + AlgoNumber, CypherXTEA.Decrypt },
{ (int)Algorithm.Knapsack + AlgoNumber, CypherKnapsack.Decrypt },
{ (int)Algorithm.MD5 + AlgoNumber, CypherKnapsack.Decrypt }
}
}
;
// Initializing key and IV dictionary
if (KeyIVDictionary == null)
{
KeyIVDictionary
= new Dictionary <int, Func <byte[], bool> >()
{
// Set Key methods
{ (int)Algorithm.DoubleTranposition, CypherDoubleTransposition.SetKey },
{ (int)Algorithm.XTEA, CypherXTEA.SetKey },
{ (int)Algorithm.Knapsack, CypherKnapsack.SetKey },
{ (int)Algorithm.MD5, CypherMD5.SetKey },
// Set IV methods, enum value + number of algorithms
{ (int)Algorithm.DoubleTranposition + AlgoNumber, CypherDoubleTransposition.SetIV },
{ (int)Algorithm.XTEA + AlgoNumber, CypherXTEA.SetIV },
{ (int)Algorithm.Knapsack + AlgoNumber, CypherKnapsack.SetIV },
{ (int)Algorithm.MD5 + AlgoNumber, CypherMD5.SetIV }
}
}
;
// Initializing property dictionary
if (PropertyDictionary == null)
{
PropertyDictionary
= new Dictionary <int, Func <IDictionary <string, byte[]>, bool> >()
{
// Set Property methods
{ (int)Algorithm.DoubleTranposition, CypherDoubleTransposition.SetAlgorithmProperties },
{ (int)Algorithm.XTEA, CypherXTEA.SetAlgorithmProperties },
{ (int)Algorithm.Knapsack, CypherKnapsack.SetAlgorithmProperties },
{ (int)Algorithm.MD5, CypherMD5.SetAlgorithmProperties },
}
}
;
}
