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diff --git a/src/org/average/nfcauthcr/NFCAuthCRYubiNeo.java b/src/org/average/nfcauthcr/NFCAuthCRYubiNeo.java
new file mode 100644
index 0000000..67596e6
--- /dev/null
+++ b/src/org/average/nfcauthcr/NFCAuthCRYubiNeo.java
@@ -0,0 +1,83 @@
+package org.average.nfcauthcr;
+
+import java.io.IOException;
+import java.util.Arrays;
+
+import android.nfc.NfcAdapter;
+import android.nfc.Tag;
+import android.nfc.TagLostException;
+import android.nfc.tech.IsoDep;
+import android.util.Log;
+
+import org.average.nfcauthcr.NFCAuthCRYubiNeo;
+
+public class NFCAuthCRYubiNeo {
+
+	private static final String TAG = "NFCAuthCRYubiNeo";
+
+	// Is it CCID APDU? ISO 7816-4?
+
+	// 00 A4 04 00 xx AID - GlobalPlatform - SELECT
+	// Le send data = 07: A0 00 00 05 27 20 01
+	// Le recv data = 00
+	private static final byte[] selectCommand =
+		{0x00, (byte) 0xA4, 0x04, 0x00, 0x07, (byte) 0xA0,
+		 0x00, 0x00, 0x05, 0x27, 0x20, 0x01, 0x00};
+
+	private static final byte[] crCommand =
+		{0x00, 0x01, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
+
+	private static final byte SLOT_CHAL_HMAC1 = 0x30;
+	private static final byte SLOT_CHAL_HMAC2 = 0x38;
+
+	public static final byte[] doChallengeYubiKey(IsoDep isoTag, int slot,
+						byte[] challenge) {
+		try {
+			isoTag.connect();
+			byte[] resp = isoTag.transceive(selectCommand);
+			int length = resp.length;
+			Log.v(TAG, "response to select length is " + length);
+			if (resp[length - 2] != (byte)0x90 ||
+			    resp[length - 1] != 0x00) {
+				Log.v(TAG, "Wrong response to select");
+				//Toast.makeText(this, R.string.tag_error,
+				//		Toast.LENGTH_LONG).show();
+				return null;
+			}
+			byte[] apdu = new byte[69];
+			apdu[0] = 0x00; // CLA
+			apdu[1] = 0x01; // INS
+			switch (slot) {
+			case 1: apdu[2] = SLOT_CHAL_HMAC1; break; // P1
+			case 2: apdu[2] = SLOT_CHAL_HMAC2; break; // P1
+			}
+			apdu[3] = 0x00; // P2
+			apdu[4] = 63;   // Lc
+			System.arraycopy(challenge, 0, apdu, 5,
+							challenge.length);
+			apdu[apdu.length-1] = 22;
+			resp = isoTag.transceive(apdu);
+			length = resp.length;
+			if (resp[length - 2] != (byte)0x90 ||
+			    resp[length - 1] != 0x00) {
+				Log.v(TAG, "Wrong response to challenge");
+				//Toast.makeText(this, R.string.tag_error,
+				//		Toast.LENGTH_LONG).show();
+				return null;
+			}
+			Log.v(TAG, "response to challenge length is " + length);
+			return Arrays.copyOf(resp, length-2);
+		} catch (TagLostException e) {
+			Log.v(TAG, e.getMessage());
+			//Toast.makeText(this,
+			//	R.string.tag_lost, Toast.LENGTH_LONG).show();
+		} catch (IOException e) {
+			Log.v(TAG, e.getMessage());
+			//Toast.makeText(this,
+			//	getText(R.string.tag_error) +
+			//	e.getMessage(),
+			//	Toast.LENGTH_LONG).show();
+		}
+		return null;
+	}
+}