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);
}
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[] Encode(string password)
{
var secureRandom = new SecureRandomGenerator();
var msBlock = new MemoryStream();
var msContent = new MemoryStream();
int leftPaddingLength = secureRandom.GetRandomInt(64, 512);
int rightPaddingLength = secureRandom.GetRandomInt(64, 512);
byte[] sharedSecretBytes = GeneralConverters.StringToByteArray(SharedSecret);
byte[] buffer = BitConverter.GetBytes(leftPaddingLength);
msBlock.Write(buffer, 0, buffer.Length);
buffer = BitConverter.GetBytes(rightPaddingLength);
msBlock.Write(buffer, 0, buffer.Length);
buffer = BitConverter.GetBytes(leftPaddingLength + rightPaddingLength + sharedSecretBytes.Length);
msBlock.Write(buffer, 0, buffer.Length);
msBlock.Write(secureRandom.GetRandomData(leftPaddingLength), 0, leftPaddingLength);
msBlock.Write(sharedSecretBytes, 0, sharedSecretBytes.Length);
msBlock.Write(secureRandom.GetRandomData(rightPaddingLength), 0, rightPaddingLength);
byte[] encodeBytes = msBlock.ToArray();
encodeBytes = EncryptionManager.EncryptData(encodeBytes, password);
byte[] hashBytes = SHA512.Create().ComputeHash(encodeBytes, 0, encodeBytes.Length);
buffer = BitConverter.GetBytes(encodeBytes.Length);
msContent.Write(buffer, 0, buffer.Length);
msBlock.WriteTo(msContent);
buffer = BitConverter.GetBytes(hashBytes.Length);
msContent.Write(buffer, 0, buffer.Length);
msContent.Write(hashBytes, 0, hashBytes.Length);
return(msContent.ToArray());
}
