private string EncryptWindows(SecureToken data)
{
if (data == null)
{
return(null);
}
#if PROTECTEDDATA
return(Convert.ToBase64String(ProtectedData.Protect(data.UseString((ref string s) => Encoding.UTF8.GetBytes(s))
, ConnectionPreferences.Salt, DataProtectionScope.CurrentUser)));
#else
return(null);
#endif
}
private bool TryDecryptWindows(string encrypted, out SecureToken decrypted)
{
decrypted = string.Empty;
#if PROTECTEDDATA
try
{
var data = Convert.FromBase64String(encrypted);
var decryptedData = ProtectedData.Unprotect(data, Salt, DataProtectionScope.CurrentUser);
var chars = Encoding.UTF8.GetChars(decryptedData);
decrypted = new SecureToken(ref chars);
return(true);
}
catch (System.Security.Cryptography.CryptographicException)
{
return(false);
}
catch (FormatException)
{
return(false);
}
#else
return(false);
#endif
}
/// <summary>
/// Instantiate an <see cref="ExplicitCredentials"/> instance
/// </summary>
/// <param name="database">Name of the database</param>
/// <param name="username">User name</param>
/// <param name="password">Password</param>
public ExplicitCredentials(string database, string username, SecureToken password)
{
Database = database;
Username = username;
Password = password;
}
/// <summary>
/// Indicates if a <see cref="SecureToken"/> is null or empty
/// </summary>
/// <param name="token">The token to check.</param>
/// <returns>
/// <c>true</c> if <paramref name="token"/> is null or empty (with a <see cref="SecureToken.Length"/> < 0; otherwise, <c>false</c>.
/// </returns>
public static bool IsNullOrEmpty(this SecureToken token)
{
return(token == null || token.Length < 1);
}
/// <summary>
/// Calculate the MD5 checksum of the securely stored value
/// </summary>
public string CalcMd5(SecureToken value)
{
return(value.UseBytes((ref byte[] b) => MD5.ComputeHash(b)).ToLowerInvariant());
}