Org.BouncyCastle.Crypto.Generators.OpenSslPbeParametersGenerator.GenerateDerivedKey C# (CSharp) Method

		private byte[] GenerateDerivedKey(
			int bytesNeeded)
		{
			byte[] buf = new byte[digest.GetDigestSize()];
			byte[] key = new byte[bytesNeeded];
			int offset = 0;
        
			for (;;)
			{
				digest.BlockUpdate(mPassword, 0, mPassword.Length);
				digest.BlockUpdate(mSalt, 0, mSalt.Length);

				digest.DoFinal(buf, 0);

				int len = (bytesNeeded > buf.Length) ? buf.Length : bytesNeeded;
				Array.Copy(buf, 0, key, offset, len);
				offset += len;

				// check if we need any more
				bytesNeeded -= len;
				if (bytesNeeded == 0)
				{
					break;
				}

				// do another round
				digest.Reset();
				digest.BlockUpdate(buf, 0, buf.Length);
			}

			return key;
		}