private static string HashElf(ElfHeader elf, long basePosition, Stream input)
{
using (var sha1 = SHA1.Create())
{
foreach (var program in elf.ProgramHeaders)
{
var type = (uint)program.Type;
var flags = (uint)program.Flags;
sha1.TransformBlock(BitConverter.GetBytes(type.Swap()), 0, 4, null, 0);
sha1.TransformBlock(BitConverter.GetBytes(flags.Swap()), 0, 4, null, 0);
if (program.Type == Elf.ProgramType.Loadable && program.MemorySize > 0)
{
sha1.TransformBlock(BitConverter.GetBytes(program.VirtualAddress.Swap()), 0, 8, null, 0);
sha1.TransformBlock(BitConverter.GetBytes(program.MemorySize.Swap()), 0, 8, null, 0);
if (program.FileSize > 0)
{
if (basePosition + program.FileOffset + program.FileSize > input.Length)
{
return(null);
}
input.Position = basePosition + program.FileOffset;
var programBytes = input.ReadBytes((int)program.FileSize);
sha1.TransformBlock(programBytes, 0, programBytes.Length, null, 0);
}
}
}
sha1.TransformFinalBlock(new byte[0], 0, 0);
return(BitConverter.ToString(sha1.Hash).Replace("-", "").ToLowerInvariant());
}
}
/// <summary>
/// Gets SHA1 implementation.
/// </summary>
/// <returns><see cref="Sha1"/>.</returns>
public static Sha1 GetSha1Provider()
{
#if NetCore
return(Sha1.Create());
#else
return(new Sha1());
#endif
}
public static string ComputeCodeHash(this byte[] code)
{
var sha1 = SHA1.Create();
sha1.TransformFinalBlock(code, 0, code.Length);
var digest = sha1.Hash;
return(BitConverter.ToString(digest).Replace("-", "").ToLower());
}
public void Imorted_sha1_algo_should_generate_same_hash_as_mscorelib_version()
{
byte[] source = Encoding.UTF8.GetBytes("hashmeplease");
var mscorlibSha1 = MsCoreLibSha1.Create();
var importedSha1 = SHA1.Create();
var mscorelibHash = mscorlibSha1.ComputeHash(source);
var importedHash = importedSha1.ComputeHash(source);
mscorelibHash.Should().BeEquivalentTo(importedHash);
}
public Torrent(string name,
string downloadDir,
List <FileItem> files,
List <string> trackers,
int pieceSize,
byte[] pieceHashes = null,
int blockSize = 16384,
bool?isPrivate = false)
{
Name = name;
DownloadDirectory = downloadDir;
Files = files;
PieceSize = pieceSize;
BlockSize = blockSize;
IsPrivate = isPrivate;
fileWriteLocks = new object[Files.Count];
for (var i = 0; i < Files.Count; ++i)
{
fileWriteLocks[i] = new object();
}
if (trackers != null)
{
foreach (var url in trackers)
{
var tracker = new Tracker(url);
Trackers.Add(tracker);
tracker.PeerListUpdated += HandlePeerListUpdated;
}
}
var piecesCount = Convert.ToInt32(Math.Ceiling(TotalSize / Convert.ToDouble(PieceSize)));
PieceHashes = new byte[piecesCount][];
IsPieceVerified = new bool[piecesCount];
IsBlockAcquired = new bool[piecesCount][];
for (var i = 0; i < PieceCount; ++i)
{
IsBlockAcquired[i] = new bool[GetBlockCount(i)];
}
if (pieceHashes != null)
{
for (var i = 0; i < PieceCount; ++i)
{
PieceHashes[i] = GetHash(i);
}
}
else
{
for (var i = 0; i < PieceCount; ++i)
{
PieceHashes[i] = new byte[20];
Buffer.BlockCopy(pieceHashes, i * 20, PieceHashes[i], 0, 20);
}
}
object info = TorrentInfoToBEncodingObject(this);
byte[] bytes = BEncoding.Encode(info);
InfoHash = SHA1.Create().ComputeHash(bytes);
for (var i = 0; i < PieceCount; ++i)
{
CheckIntegrityOfPiece(i);
}
}
