public string GenerateKey()
{
const string originalLookupIndex = "SecureMemo";
string key;
using var secureRnd = new SecureRandomGenerator();
string tmp = secureRnd.GetPasswordString(secureRnd.GetRandomInt(29, 221)) + originalLookupIndex + secureRnd.GetPasswordString(secureRnd.GetRandomInt(29, 221));
// ReSharper disable once SuggestVarOrType_Elsewhere
byte[] buffer = GeneralConverters.ConvertStringToByteArray(Encoding.ASCII, tmp);
for (int i = 0; i < secureRnd.GetRandomInt(83, 101); i++)
{
// Tick count being tracked by .Net using 32 bit integers for some strange reason when the WIN_API CALL uses ulong and thus not overflowing in 24 days and 20 hours.
int tickCount = Environment.TickCount;
// Just inject a small amount of noise for each iteration
int pos = tickCount % buffer.Length;
buffer[pos] ^= (byte)(tickCount % byte.MaxValue);
buffer = SHA512.GetSHA512HashAsByteArray(buffer);
}
buffer = SHA256.GetSHA256HashAsByteArray(buffer);
key = Convert.ToBase64String(buffer, 0, buffer.Length, Base64FormattingOptions.None).Trim("=".ToCharArray());
return(key);
}
public byte[] GenerateBinaryKey()
{
const string originalLookupIndex = "SecureMemo";
using var secureRnd = new SecureRandomGenerator();
MemoryStream ms = new MemoryStream();
byte[] buffer = secureRnd.GetRandomData(secureRnd.GetRandomInt(29, 221));
ms.Write(buffer, 0, buffer.Length);
buffer = GeneralConverters.ConvertStringToByteArray(Encoding.ASCII, originalLookupIndex);
ms.Write(buffer, 0, buffer.Length);
buffer = secureRnd.GetRandomData(secureRnd.GetRandomInt(29, 221));
ms.Write(buffer, 0, buffer.Length);
buffer = ms.ToArray();
// ReSharper disable once SuggestVarOrType_Elsewhere
for (int i = 0; i < secureRnd.GetRandomInt(83, 101); i++)
{
// Tick count being tracked by .Net using 32 bit integers for some strange reason when the WIN_API CALL uses ulong and thus not overflowing in 24 days and 20 hours.
int tickCount = Environment.TickCount;
// Just inject a small amount of noise for each iteration
int pos = tickCount % buffer.Length;
buffer[pos] ^= (byte)(tickCount % byte.MaxValue);
buffer = SHA512.GetSHA512HashAsByteArray(buffer);
}
buffer = SHA256.GetSHA256HashAsByteArray(buffer);
return(buffer);
}
