public void Open(string algorithm)
{
Close();
int status = BCryptDll.BCryptOpenAlgorithmProvider(
out IntPtr hAlgorithm,
algorithm,
BCryptDll.MS_PRIMITIVE_PROVIDER,
0);
if (status != 0)
{
throw new Exception($"Error: Status = {status}");
}
_hAlgorithm = hAlgorithm;
byte[] length = new byte[4];
status = BCryptDll.BCryptGetProperty(
_hAlgorithm,
BCryptDll.BCRYPT_HASH_LENGTH,
length,
out uint pcbResult,
0);
if (status != 0 || pcbResult != 4)
{
throw new Exception($"Error: Status = {status}");
}
_hashLength = BitConverter.ToInt32(length, 0);
}
public static byte[] GenerateRandomNumber(int length)
{
var buffer = new byte[length];
int status = BCryptDll.BCryptGenRandom(IntPtr.Zero, buffer, BCryptDll.BCRYPT_USE_SYSTEM_PREFERRED_RNG);
if (status != 0)
{
throw new Exception($"Error: Status = {status}");
}
return(buffer);
}
public void Close()
{
if (_hAlgorithm == IntPtr.Zero)
{
return;
}
int status = BCryptDll.BCryptCloseAlgorithmProvider(_hAlgorithm, 0);
if (status != 0)
{
throw new Exception($"Error: Status = {status}");
}
}
public byte[] Hash(byte[] input, byte[] secret)
{
byte[] output = new byte[_hashLength];
int status = BCryptDll.BCryptHash(
_hAlgorithm,
secret,
input,
output
);
if (status != 0)
{
throw new Exception($"Error: Status = {status}");
}
return(output);
}