public override byte[] GenerateMask(byte[] rgbSeed, int cbReturn)
{
using (HashAlgorithm hasher = CryptoConfig.CreateFromName(_hashNameValue) as HashAlgorithm)
{
if (hasher is null)
{
throw new CryptographicException(SR.Format(SR.Cryptography_UnknownHashAlgorithm, _hashNameValue));
}
byte[] rgbCounter = new byte[4];
byte[] rgbT = new byte[cbReturn];
uint counter = 0;
for (int ib = 0; ib < rgbT.Length;)
{
// Increment counter -- up to 2^32 * sizeof(Hash)
Helpers.ConvertIntToByteArray(counter++, rgbCounter);
hasher.TransformBlock(rgbSeed, 0, rgbSeed.Length, rgbSeed, 0);
hasher.TransformFinalBlock(rgbCounter, 0, 4);
byte[] hash = hasher.Hash;
hasher.Initialize();
Buffer.BlockCopy(hash, 0, rgbT, ib, Math.Min(rgbT.Length - ib, hash.Length));
ib += hasher.Hash.Length;
}
return(rgbT);
}
}
public override byte[] GenerateMask(byte[] rgbSeed, int cbReturn)
{
using (HashAlgorithm hasher = SHA1.Create())
{
byte[] rgbCounter = new byte[4];
byte[] rgbT = new byte[cbReturn];
uint counter = 0;
for (int ib = 0; ib < rgbT.Length;)
{
// Increment counter -- up to 2^32 * sizeof(Hash)
Helpers.ConvertIntToByteArray(counter++, rgbCounter);
hasher.TransformBlock(rgbSeed, 0, rgbSeed.Length, rgbSeed, 0);
hasher.TransformFinalBlock(rgbCounter, 0, 4);
byte[] hash = hasher.Hash;
hasher.Initialize();
Buffer.BlockCopy(hash, 0, rgbT, ib, Math.Min(rgbT.Length - ib, hash.Length));
ib += hasher.Hash.Length;
}
return(rgbT);
}
}
