Org.BouncyCastle.Crypto.Signers.PssSigner.MaskGeneratorFunction1 C# (CSharp) Method

		private byte[] MaskGeneratorFunction1(
			byte[]	Z,
			int		zOff,
			int		zLen,
			int		length)
		{
			byte[] mask = new byte[length];
			byte[] hashBuf = new byte[mgfhLen];
			byte[] C = new byte[4];
			int counter = 0;

			mgfDigest.Reset();

			while (counter < (length / mgfhLen))
			{
				ItoOSP(counter, C);

				mgfDigest.BlockUpdate(Z, zOff, zLen);
				mgfDigest.BlockUpdate(C, 0, C.Length);
				mgfDigest.DoFinal(hashBuf, 0);

				hashBuf.CopyTo(mask, counter * mgfhLen);
				++counter;
			}

			if ((counter * mgfhLen) < length)
			{
				ItoOSP(counter, C);

				mgfDigest.BlockUpdate(Z, zOff, zLen);
				mgfDigest.BlockUpdate(C, 0, C.Length);
				mgfDigest.DoFinal(hashBuf, 0);

				Array.Copy(hashBuf, 0, mask, counter * mgfhLen, mask.Length - (counter * mgfhLen));
			}

			return mask;
		}
	}