public async Task <bool> Authenticate(string email, string password)
{
var hashedPassword = _hashProvider.Hash(password);
var entity =
await
_context.Users.FirstOrDefaultAsync(u => u.Email.Equals(email) && u.Password.Equals(hashedPassword));
return(entity != null);
}
public static FileItem Create(FileInfo file, IHashProvider hasher)
{
var item = new FileItem
{
Source = FileService.Local,
IsFolder = false,
IsDeleted = true,
Name = file.Name,
Path = file.FullName.Replace("\\", "/"),
Id = string.Empty,
ServerRev = string.Empty,
Hash = null,
Size = 0,
LastModified = file.LastWriteTimeUtc,
ClientModified = file.LastWriteTimeUtc,
Object = file
};
if (file.Exists)
{
item.IsDeleted = false;
item.Hash = hasher.Hash(file);
item.Size = (ulong)file.Length;
}
return(item);
}
/// <summary>
/// Verifica lo stato di un file su disco.
/// </summary>
/// <param name="filename">Percorso del file da verificare</param>
/// <param name="hash">Hash atteso per questo file</param>
/// <param name="provider">Specifica l'algoritmo di hashing da utilizzare</param>
/// <param name="usePersistentFile">Legge, crea o aggiorna un file di testo con l'hash calcolato per il file.
/// Può rendere piu veloci i controlli ripetuti.</param>
/// <returns></returns>
public static FileStatus VerifyHash(string filename, string hash, IHashProvider provider, bool usePersistentFile = false)
{
try
{
if (!File.Exists(filename))
{
return(FileStatus.Missing);
}
string calucatedHash;
if (usePersistentFile)
{
var hashfile = GetHashFileName(filename, provider);
// utilizza un file temporaneo con l'hash calcolato per velocizzare i controlli successivi
if (File.Exists(hashfile) && File.GetLastWriteTime(hashfile) >= File.GetLastWriteTime(filename))
{
calucatedHash = File.ReadAllText(hashfile);
}
else
{
calucatedHash = provider.Hash(new FileInfo(filename)).ToString(default(BinaryRepresentation));
if (File.Exists(hashfile))
{
// If File is hidden File.WriteAllText throws UnauthorizedAccessException
File.SetAttributes(hashfile, FileAttributes.Normal);
}
File.WriteAllText(hashfile, calucatedHash);
File.SetAttributes(hashfile, FileAttributes.Hidden | FileAttributes.NotContentIndexed);
}
}
else
{
calucatedHash = provider.Hash(new FileInfo(filename)).ToString(default(BinaryRepresentation));
}
return(calucatedHash.Equals(hash)
? FileStatus.Present
: FileStatus.Corrupted);
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
return(FileStatus.Unknown);
}
}
/// <summary>
/// Starting with the innermost nodes, replace all lookups with identities
/// </summary>
/// <param name="xElement"></param>
private void ReplaceReferenceLookupsWithIdentities(XElement xElement)
{
XElement newIdentity = null;
var ns = xElement.Name.Namespace;
if (_regex.IsMatch(xElement.Name.LocalName))
{
var typeName = _regex.Match(xElement.Name.LocalName).Groups["TypeName"].Value;
var lookup = xElement.Element(ns + $"{typeName}Lookup");
var identity = xElement.Element(ns + $"{typeName}Identity");
if (lookup != null && identity == null)
{
var hashBytes = _hashProvider.Hash(lookup.ToString());
var hash = _hashProvider.BytesToStr(hashBytes);
if (_hashIdentities.ContainsKey(hash) && _hashIdentities[hash] != null)
{
newIdentity = XElement.Parse(_hashIdentities[hash].ToString());
lookup.AddBeforeSelf(
new XComment(
$"This {typeName}Lookup entity was used to populate its {typeName}Identity sibling"));
}
else
{
lookup.AddBeforeSelf(
new XComment(
$"No {typeName}Identity could be retrieved for this {typeName}Lookup entity"));
}
}
foreach (var element in xElement.Elements())
{
ReplaceReferenceLookupsWithIdentities(element);
}
if (newIdentity == null)
{
return;
}
xElement.Add(newIdentity);
newIdentity.AddBeforeSelf(
new XComment(
$"This {typeName}Identity entity was retrieved from the API using the provided {typeName}Lookup information"));
}
else
{
foreach (var element in xElement.Elements())
{
ReplaceReferenceLookupsWithIdentities(element);
}
}
}
private void SetPassword(string password)
{
if (string.IsNullOrWhiteSpace(password))
{
throw new PasswordRequiredException();
}
if (password.Length < 6)
{
throw new PasswordLengthLessThanSixException();
}
this.Password = hashProvider.Hash(password, Id.ToString());
}
public static void Test(Dictionary <string, string> testVectors,
IHashProvider hashFunction)
{
foreach (var(input, expectedOutput) in testVectors.Tuples())
{
byte[] inputArray = Encoding.StringToByteArray(input);
string actualOutput = Encoding.ByteArrayToHexString(
hashFunction.Hash(inputArray)
);
Assert.AreEqual <string>(expectedOutput, actualOutput);
}
}
public byte[] Hash(byte[] input, HashProviders provider = HashProviders.Default)
{
IHashProvider p = null;
if (provider == HashProviders.UserAccountSecurity)
{
p = _resolver.Resolve <IHashProvider>("MURMUR3");
}
else
{
p = _resolver.Resolve <IHashProvider>();
}
return(p.Hash(input));
}
public bool IsValidPassword(string password, IHashProvider hashProvider)
{
var hash = hashProvider.Hash(Encoding.UTF8.GetBytes(password), Salt);
if (PasswordHash.Length != hash.Length)
{
return(false);
}
for (int i = 0; i < PasswordHash.Length; i++)
{
if (PasswordHash[i] != hash[i])
{
return(false);
}
}
return(true);
}
