internal float CalculateRoll(ServerSeed serverSeed)
{
var key = serverSeed.HexString;
var text = ClientSeed + "-" + Nonce;
// Generate HMAC-SHA256 hash using server seed as key and text as message
var algorithm = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha512);
var hasher = algorithm.CreateHash(Encoding.UTF8.GetBytes(key));
hasher.Append(Encoding.UTF8.GetBytes(text));
var bytes = hasher.GetValueAndReset();
// Keep grabbing hash bytes while the lucky number is greater than 10^6
for (var i = 0; i + 2 < bytes.Length; i += 2) {
// Start calculating the lucky number using the next 3 bytes
var lucky = (bytes[i] << 16) + (bytes[i + 1] << 8) + bytes[i + 2];
// Determine whether the iteration count is odd or even
if (i % 4 == 0) {
// Even: Use the first 5 digits of the hex string from the 3 bytes
lucky = (lucky - lucky % 16) >> 4;
} else {
// Odd: Use the last 5 digits of the hex string from the 3 bytes
lucky %= 2 << 24;
}
// Return a lucky number if possible
if (lucky < 1000000) {
return (float)(lucky % 10000) / 100;
}
}
// If the end of the hash is reached, just default to the highest number
return 99.99F;
}
internal float CalculateRoll(ServerSeed serverSeed)
{
var key = serverSeed.HexString;
var text = ClientSeed + "-" + Nonce;
// Generate HMAC-SHA256 hash using server seed as key and text as message
var algorithm = WinRTCrypto.MacAlgorithmProvider.OpenAlgorithm(MacAlgorithm.HmacSha512);
var hasher = algorithm.CreateHash(Encoding.UTF8.GetBytes(key));
hasher.Append(Encoding.UTF8.GetBytes(text));
var bytes = hasher.GetValueAndReset();
// Keep grabbing hash bytes while the lucky number is greater than 10^6
for (var i = 0; i + 2 < bytes.Length; i += 2)
{
// Start calculating the lucky number using the next 3 bytes
var lucky = (bytes[i] << 16) + (bytes[i + 1] << 8) + bytes[i + 2];
// Determine whether the iteration count is odd or even
if (i % 4 == 0)
{
// Even: Use the first 5 digits of the hex string from the 3 bytes
lucky = (lucky - lucky % 16) >> 4;
}
else
{
// Odd: Use the last 5 digits of the hex string from the 3 bytes
lucky %= 2 << 24;
}
// Return a lucky number if possible
if (lucky < 1000000)
{
return((float)(lucky % 10000) / 100);
}
}
// If the end of the hash is reached, just default to the highest number
return(99.99F);
}
/// <summary>Verifies the validity of the bet's outcome.</summary>
/// <param name="serverSeed">The server seed which was used for rolling.</param>
/// <returns>True whether the outcome of the bet was calculated fairly.</returns>
public bool Verify(ServerSeed serverSeed)
{
return(CalculateRoll(serverSeed).Equals(Roll));
}
/// <summary>Verifies the validity of the bet's outcome.</summary>
/// <param name="serverSeed">The server seed which was used for rolling.</param>
/// <returns>True whether the outcome of the bet was calculated fairly.</returns>
public bool Verify(ServerSeed serverSeed)
{
return CalculateRoll(serverSeed).Equals(Roll);
}