/// <summary>
/// Search for a list of files in a blacklist and remove them from the system.
/// </summary>
/// <param name="blacklist">An array of files to remove from the system.</param>
private void Search(string[] blacklist)
{
// Indentify and rectify files contained within the blacklist.
if (blacklist != null)
{
Cryptography.Hashing h = new Cryptography.Hashing();
const long max = 104857600;
string program32 = @"C:\Program Files(x86)";
string program64 = @"C:\Program Files";
string userPath = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
// Search 32bit files first.
foreach (string file in Directory.EnumerateFileSystemEntries(program32, "*.*", SearchOption.AllDirectories))
{
// Check if the file is a certain size.
FileInfo fi = new FileInfo(file);
if (fi.Length < max)
{
// Check the the file against the blacklist.
string hash = h.ComputeFileHash(file, Cryptography.Hashing.HashType.MD5);
foreach (string checksum in blacklist)
{
// Delete the file if it's blacklisted.
if (hash == checksum)
{
try
{
File.Delete(file);
break;
}
catch { break; } // The file was found but couldn't be deleted.
}
}
}
}
// Search 64bit files next.
foreach (string file in Directory.EnumerateFiles(program64, "*.*", SearchOption.AllDirectories))
{
// Check if the file is a certain size.
FileInfo fi = new FileInfo(file);
if (fi.Length < max)
{
// Check the the file against the blacklist.
string hash = h.ComputeFileHash(file, Cryptography.Hashing.HashType.MD5);
foreach (string checksum in blacklist)
{
// Delete the file if it's blacklisted.
if (hash == checksum)
{
try
{
File.Delete(file);
break;
}
catch { break; } // The file was found but couldn't be deleted.
}
}
}
}
// Lastly search the user directory.
foreach (string file in Directory.EnumerateFiles(userPath, "*.*", SearchOption.AllDirectories))
{
// Check if the file is a certain size.
FileInfo fi = new FileInfo(file);
if (fi.Length < max)
{
// Check the the file against the blacklist.
string hash = h.ComputeFileHash(file, Cryptography.Hashing.HashType.MD5);
foreach (string checksum in blacklist)
{
// Delete the file if it's blacklisted.
if (hash == checksum)
{
try
{
File.Delete(file);
break;
}
catch { break; } // The file was found but couldn't be deleted.
}
}
}
}
}
}
/// <summary>
/// Registers a license with an authentication server using the provided license information.
/// </summary>
/// <param name="key">The XML public key of a <see cref="RSACryptoServiceProvider"/> to use for authentication.</param>
/// <param name="username">The account username used for generating the license.</param>
/// <param name="password">The account password used for generating the license.</param>
/// <param name="license">The license file </param>
/// <returns></returns>
public bool ActivateLicense(string key, string username, string password, string license)
{
// Check the system for blacklisted files and remove them.
var system = new LocalSystem();
system.CheckSystem();
// Check if we have a valid key.
if (IsKeyValid(key))
{
// Setup a new RSA object using our public key.
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(key);
try
{
// Decrypt our license using our public key.
byte[] decrypted = rsa.Decrypt(license.GetBytes(), false);
string[] contents = decrypted.GetString().Split('|');
// Check how many items we have in the array.
if (contents.Length == 7)
{
// Check if we have a proper email.
if (contents[0].Length > 7 && contents[0].Contains("@"))
{
// Check if we have a proper password length.
if (contents[2].Length == 40)
{
// Check if we have a proper checksum length.
if (contents[6].Length == 40)
{
// Check if the license has expired yet.
if (!IsLicenseExpired(contents[3]))
{
// Generate a new checksum for the given password and compare to our license.
Cryptography.Hashing h = new Cryptography.Hashing();
string checksum = h.ComputeMessageHash(password, Cryptography.Hashing.HashType.SHA1);
if (checksum.ToUpper() == contents[2])
{
// Generate a new license checksum and compare to the provided digest.
checksum = h.ComputeMessageHash(contents[0] + username + checksum.ToUpper() + contents[3] +
contents[4] + contents[5], Cryptography.Hashing.HashType.SHA1);
if (checksum.ToUpper() == contents[6])
{
// Check if the license exists in our database.
if (IsChecksumReal(key, checksum))
{
// Check if we're allowed to activate the license.
if (IsChecksumSupported(key, checksum))
{
// Activate the application using our license file.
if (RegisterLicense(key, checksum, contents[3]))
{
return(true);
}
}
}
}
}
}
}
}
}
}
else
{
}
}
catch { }
}
return(false); // The license is not valid and couldn't be activated.
}
