/*public byte[] GetTTH(string Filename)
* {
*
* HashHolder Result;
* try
* {
* FilePtr = new FileStream(Filename,FileMode.Open,FileAccess.Read,FileShare.ReadWrite);
*
* //if the file is 0 byte long.
* if (FilePtr.Length == ZERO_BYTE_FILE)
* {
* Tiger TG = new Tiger();
*
* Result.HashValue = TG.ComputeHash(new byte[] { 0 });
* }
* //if there's only one block in file use SmallFile().
* else if (FilePtr.Length <= Block_Size)
* Result.HashValue = SmallFile();
*
* else
* {
* //get how many leafs are in file.
* Leaf_Count = (int)FilePtr.Length / Block_Size;
*
* if (FilePtr.Length % Block_Size > 0)
* Leaf_Count++;
*
* //load blocks of data and get tiger hash for each one.
* LoadLeafHash();
*
* //get root hash from blocks hash.
* Result = GetRootHash();
* }
*
* FilePtr.Close();
*
* return Result.HashValue;
* }
* catch (Exception e)
* {
* System.Diagnostics.Debug.WriteLine("error while trying to get TTH for file: " +
* Filename + ". (" + e.Message + ")");
*
* if (FilePtr != null)
* FilePtr.Close();
*
* return null;
* }
* }*/
private byte[] SmallFile()
{
Tiger TG = new Tiger();
byte[] Block = new byte[Block_Size];
int BlockSize = FilePtr.Read(Block, 0, 1024);
//gets hash for a single block file.
return(LH(ByteExtract(Block, BlockSize)));
}
private byte[] LH(byte[] Raw_Data) //leaf hash.
{
byte[] Data = new byte[Raw_Data.Length + 1];
Data[0] = 0x00; //leaf hash mark.
Raw_Data.CopyTo(Data, 1);
//gets tiger hash value for leafs blocks.
Tiger TG = new Tiger();
TG.Initialize();
return(TG.ComputeHash(Data));
}
private byte[] IH(byte[] LeafA, byte[] LeafB) //internal hash.
{
byte[] Data = new byte[LeafA.Length + LeafB.Length + 1];
Data[0] = 0x01; //internal hash mark.
//combines two leafs.
LeafA.CopyTo(Data, 1);
LeafB.CopyTo(Data, LeafA.Length + 1);
//gets tiger hash value for combined leaf hash.
Tiger TG = new Tiger();
TG.Initialize();
return(TG.ComputeHash(Data));
}
public static bool SelfTest()
{
ASCIIEncoding enc = null;
byte[] hash = null;
int nI = 0;
string TEST_DATA = null;
byte[] TEST_HASH = null;
Tiger tg = null;
int _Vb_t_i4_0 = 0;
byte[] _Vb_t_array_0 = null;
TEST_DATA = "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
_Vb_t_array_0 = new byte[] { ((byte)15), ((byte)123), ((byte)249), ((byte)161), ((byte)155), ((byte)156), ((byte)88), ((byte)242), ((byte)183), ((byte)97),
((byte)13), ((byte)247), ((byte)232), ((byte)79), ((byte)10), ((byte)195), ((byte)167), ((byte)28), ((byte)99), ((byte)30),
((byte)123), ((byte)83), ((byte)247), ((byte)142) };
TEST_HASH = _Vb_t_array_0;
tg = new Tiger();
tg.Initialize();
enc = new ASCIIEncoding();
hash = tg.ComputeHash(enc.GetBytes(TEST_DATA));
if (hash.Length != TEST_HASH.Length)
{
return(false);
}
_Vb_t_i4_0 = (TEST_HASH.Length - 1);
for (nI = 0; (nI <= _Vb_t_i4_0); nI++)
{
if (hash[nI] != TEST_HASH[nI])
{
return(false);
}
}
return(true);
}
