public void Security_Hash_File_Test()
{
string hashHex;
using (var h1 = new Hash(HashProvider.CRC32))
using (var stream = File.OpenRead(Path.Combine(Environment.CurrentDirectory, @"TestFiles\gettysburg.txt")))
{
hashHex = h1.Calculate(stream).Bytes.ToHex();
}
Assert.AreEqual(hashHex, "E37F6423");
using (var h2 = new Hash(HashProvider.MD5))
using (var stream = File.OpenRead(Path.Combine(Environment.CurrentDirectory, @"TestFiles\sample.doc")))
{
hashHex = h2.Calculate(stream).Bytes.ToHex();
}
Assert.AreEqual(hashHex, "4F32AB797F0FCC782AAC0B4F4E5B1693");
}
public void Security_Hash_File_WithProgress_Test()
{
string hashHex;
bool progressRaised = false;
var progress = new TaskSchedulerProgress<int>(new CurrentThreadTaskScheduler(), value => progressRaised = true);
using (var h1 = new Hash(HashProvider.CRC32))
using (var stream = File.OpenRead(Path.Combine(Environment.CurrentDirectory, @"TestFiles\gettysburg.txt")))
{
hashHex = h1.Calculate(stream, progress).Bytes.ToHex();
}
Assert.AreEqual(hashHex, "E37F6423");
Assert.IsTrue(progressRaised);
progressRaised = false;
progress = new TaskSchedulerProgress<int>(new CurrentThreadTaskScheduler(), value => progressRaised = true);
using (var h2 = new Hash(HashProvider.MD5))
using (var stream = File.OpenRead(Path.Combine(Environment.CurrentDirectory, @"TestFiles\sample.doc")))
{
hashHex = h2.Calculate(stream, progress).Bytes.ToHex();
}
Assert.AreEqual(hashHex, "4F32AB797F0FCC782AAC0B4F4E5B1693");
Assert.IsTrue(progressRaised);
}
private Data DoSaltedHash(HashProvider p, Data salt)
{
using (var h = new Hash(p))
{
return h.Calculate(new Data(_targetString), salt);
}
}
private Data DoHash(HashProvider p)
{
using (var h = new Hash(p))
{
return h.Calculate(new Data(_targetString));
}
}
private static string SymmetricFilePrivate(SymmetricProvider p, string fileName, string key)
{
string encryptedFilePath = Path.GetFileNameWithoutExtension(fileName) + ".encrypted";
string decryptedFilePath = Path.GetFileNameWithoutExtension(Path.GetFileNameWithoutExtension(fileName)) + "-decrypted" + Path.GetExtension(fileName);
// encrypt the file to memory
Data encryptedData;
using (var sym = new Symmetric(p))
{
sym.Key = new SymmetricKeyData(key);
using (var stream = File.OpenRead(fileName))
{
encryptedData = sym.Encrypt(stream);
}
}
// write encrypted data to a new binary file
using (var stream = File.Open(encryptedFilePath, FileMode.Create))
using (var bw = new BinaryWriter(stream))
{
bw.Write(encryptedData.Bytes);
}
// decrypt this binary file
Data decryptedData;
using (var sym2 = new Symmetric(p))
{
sym2.Key = new SymmetricKeyData(key);
using (var stream = File.OpenRead(encryptedFilePath))
{
decryptedData = sym2.Decrypt(stream);
}
}
// write decrypted data to a new binary file
using (var stream = File.Open(decryptedFilePath, FileMode.Create))
using (var bw = new BinaryWriter(stream))
{
bw.Write(decryptedData.Bytes);
}
// get the MD5 hash of the returned data
using (var h = new Hash(HashProvider.MD5))
{
return h.Calculate(decryptedData).Bytes.ToHex();
}
}
public static void VerifyDownload(string localFilePath, ApplicationUpdateFile selectedUpdate)
{
Stream stream = null;
try
{
FileInfo fileInfo = new FileInfo(localFilePath);
if (selectedUpdate.Size != fileInfo.Length)
{
throw new IOException(String.Format(CultureInfo.CurrentCulture,
"File length is '{0}', expected length is '{1}'.", fileInfo.Length, selectedUpdate.Size));
}
stream = new FileStream(localFilePath, FileMode.Open, FileAccess.Read);
if (selectedUpdate.SHA1.Length != 0)
{
Hash hash = new Hash(HashProvider.SHA1);
Data hashData = hash.Calculate(stream);
if (String.Compare(selectedUpdate.SHA1, hashData.Bytes.ToHex(), StringComparison.OrdinalIgnoreCase) != 0)
{
throw new IOException("SHA1 file hash is not correct.");
}
}
stream.Position = 0;
if (selectedUpdate.MD5.Length != 0)
{
Hash hash = new Hash(HashProvider.MD5);
Data hashData = hash.Calculate(stream);
if (String.Compare(selectedUpdate.MD5, hashData.Bytes.ToHex(), StringComparison.OrdinalIgnoreCase) != 0)
{
throw new IOException("MD5 file hash is not correct.");
}
}
}
catch (Exception)
{
TryToDelete(localFilePath);
throw;
}
finally
{
if (stream != null)
{
stream.Dispose();
}
}
}
