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Code Issues Releases Wiki Activity

remove unused NfcActivity

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This commit is contained in:
Vincent Breitmoser 2015-03-30 23:39:36 +02:00
parent 39b131c7e5
commit b0a51e7dd3
3 changed files with 5 additions and 580 deletions
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6
OpenKeychain/src/main/AndroidManifest.xml
View File

@ -670,12 +670,6 @@
restarts the activity with onCreate() instead of calling onNewIntent().
taskAffinity and allowTaskReparenting somehow prevents this from happening!
-->
<activity
android:name=".ui.NfcActivity"
android:launchMode="singleTop"
android:taskAffinity=":Nfc"
android:allowTaskReparenting="true" />
<activity
android:name=".ui.NfcOperationActivity"
android:launchMode="singleTop"

10
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFilesFragment.java
View File

@ -361,11 +361,6 @@ public class EncryptFilesFragment extends CryptoOperationFragment {
return true;
}
public void startEncrypt(boolean share) {
mShareAfterEncrypt = share;
cryptoOperation();
}
public void onEncryptSuccess(final SignEncryptResult result) {
if (mDeleteAfterEncrypt) {
final Uri[] inputUris = mInputUris.toArray(new Uri[mInputUris.size()]);
@ -472,6 +467,11 @@ public class EncryptFilesFragment extends CryptoOperationFragment {
return sendIntent;
}
public void startEncrypt(boolean share) {
mShareAfterEncrypt = share;
cryptoOperation();
}
@Override
protected void cryptoOperation(CryptoInputParcel cryptoInput) {

569
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/NfcActivity.java
View File

@ -1,569 +0,0 @@
/**
* Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann
*
* Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details.
*/
package org.sufficientlysecure.keychain.ui;
import android.annotation.TargetApi;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.IsoDep;
import android.os.Build;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.Toast;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.ui.base.BaseActivity;
import org.sufficientlysecure.keychain.util.Iso7816TLV;
import org.sufficientlysecure.keychain.util.Log;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* This class provides a communication interface to OpenPGP applications on ISO SmartCard compliant
* NFC devices.
*
* For the full specs, see http://g10code.com/docs/openpgp-card-2.0.pdf
*/
@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)
public class NfcActivity extends BaseActivity {
// actions
public static final String ACTION_SIGN_HASH = "sign_hash";
public static final String ACTION_DECRYPT_SESSION_KEY = "decrypt_session_key";
// always
public static final String EXTRA_KEY_ID = "key_id";
public static final String EXTRA_PIN = "pin";
// special extra for OpenPgpService
public static final String EXTRA_DATA = "data";
// sign
public static final String EXTRA_NFC_HASH_TO_SIGN = "nfc_hash";
public static final String EXTRA_NFC_HASH_ALGO = "nfc_hash_algo";
// decrypt
public static final String EXTRA_NFC_ENC_SESSION_KEY = "encrypted_session_key";
private Intent mServiceIntent;
private static final int TIMEOUT = 100000;
private NfcAdapter mNfcAdapter;
private IsoDep mIsoDep;
private String mAction;
private String mPin;
private Long mKeyId;
// sign
private byte[] mHashToSign;
private int mHashAlgo;
// decrypt
private byte[] mEncryptedSessionKey;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(Constants.TAG, "NfcActivity.onCreate");
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
Intent intent = getIntent();
Bundle data = intent.getExtras();
String action = intent.getAction();
// if we get are passed a key id, save it for the check
if (data.containsKey(EXTRA_KEY_ID)) {
mKeyId = data.getLong(EXTRA_KEY_ID);
}
switch (action) {
case ACTION_SIGN_HASH:
mAction = action;
mPin = data.getString(EXTRA_PIN);
mHashToSign = data.getByteArray(EXTRA_NFC_HASH_TO_SIGN);
mHashAlgo = data.getInt(EXTRA_NFC_HASH_ALGO);
mServiceIntent = data.getParcelable(EXTRA_DATA);
Log.d(Constants.TAG, "NfcActivity mAction: " + mAction);
Log.d(Constants.TAG, "NfcActivity mPin: " + mPin);
Log.d(Constants.TAG, "NfcActivity mHashToSign as hex: " + getHex(mHashToSign));
Log.d(Constants.TAG, "NfcActivity mServiceIntent: " + mServiceIntent);
break;
case ACTION_DECRYPT_SESSION_KEY:
mAction = action;
mPin = data.getString(EXTRA_PIN);
mEncryptedSessionKey = data.getByteArray(EXTRA_NFC_ENC_SESSION_KEY);
mServiceIntent = data.getParcelable(EXTRA_DATA);
Log.d(Constants.TAG, "NfcActivity mAction: " + mAction);
Log.d(Constants.TAG, "NfcActivity mPin: " + mPin);
Log.d(Constants.TAG, "NfcActivity mEncryptedSessionKey as hex: " + getHex(mEncryptedSessionKey));
Log.d(Constants.TAG, "NfcActivity mServiceIntent: " + mServiceIntent);
break;
case NfcAdapter.ACTION_TAG_DISCOVERED:
Log.e(Constants.TAG, "This should not happen! NfcActivity.onCreate() is being called instead of onNewIntent()!");
toast("This should not happen! Please create a new bug report that the NFC screen is restarted!");
finish();
break;
default:
Log.d(Constants.TAG, "Action not supported: " + action);
break;
}
}
@Override
protected void initLayout() {
setContentView(R.layout.nfc_activity);
}
/**
* Called when the system is about to start resuming a previous activity,
* disables NFC Foreground Dispatch
*/
public void onPause() {
super.onPause();
Log.d(Constants.TAG, "NfcActivity.onPause");
disableNfcForegroundDispatch();
}
/**
* Called when the activity will start interacting with the user,
* enables NFC Foreground Dispatch
*/
public void onResume() {
super.onResume();
Log.d(Constants.TAG, "NfcActivity.onResume");
enableNfcForegroundDispatch();
}
/**
* This activity is started as a singleTop activity.
* All new NFC Intents which are delivered to this activity are handled here
*/
public void onNewIntent(Intent intent) {
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {
try {
handleNdefDiscoveredIntent(intent);
} catch (IOException e) {
Log.e(Constants.TAG, "Connection error!", e);
toast("Connection Error: " + e.getMessage());
setResult(RESULT_CANCELED, mServiceIntent);
finish();
}
}
}
/** Handle NFC communication and return a result.
*
* This method is called by onNewIntent above upon discovery of an NFC tag.
* It handles initialization and login to the application, subsequently
* calls either nfcCalculateSignature() or nfcDecryptSessionKey(), then
* finishes the activity with an appropiate result.
*
* On general communication, see also
* http://www.cardwerk.com/smartcards/smartcard_standard_ISO7816-4_annex-a.aspx
*
* References to pages are generally related to the OpenPGP Application
* on ISO SmartCard Systems specification.
*
*/
private void handleNdefDiscoveredIntent(Intent intent) throws IOException {
Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
// Connect to the detected tag, setting a couple of settings
mIsoDep = IsoDep.get(detectedTag);
mIsoDep.setTimeout(TIMEOUT); // timeout is set to 100 seconds to avoid cancellation during calculation
mIsoDep.connect();
// SW1/2 0x9000 is the generic "ok" response, which we expect most of the time.
// See specification, page 51
String accepted = "9000";
// Command APDU (page 51) for SELECT FILE command (page 29)
String opening =
"00" // CLA
+ "A4" // INS
+ "04" // P1
+ "00" // P2
+ "06" // Lc (number of bytes)
+ "D27600012401" // Data (6 bytes)
+ "00"; // Le
if ( ! card(opening).equals(accepted)) { // activate connection
toast("Opening Error!");
setResult(RESULT_CANCELED, mServiceIntent);
finish();
return;
}
// Command APDU for VERIFY command (page 32)
String login =
"00" // CLA
+ "20" // INS
+ "00" // P1
+ "82" // P2 (PW1)
+ String.format("%02x", mPin.length()) // Lc
+ Hex.toHexString(mPin.getBytes());
if ( ! card(login).equals(accepted)) { // login
toast("Wrong PIN!");
setResult(RESULT_CANCELED, mServiceIntent);
finish();
return;
}
if (ACTION_SIGN_HASH.equals(mAction)) {
// If we were supplied with a key id for checking, do so
if (mKeyId != null) {
// For signing, we check the master key
long keyId = nfcGetKeyId(mIsoDep, 0);
// If it's wrong, just cancel
if (keyId != mKeyId) {
toast("NFC Tag has wrong signing key id!");
setResult(RESULT_CANCELED, mServiceIntent);
finish();
return;
}
}
// returns signed hash
byte[] signedHash = nfcCalculateSignature(mHashToSign, mHashAlgo);
if (signedHash == null) {
setResult(RESULT_CANCELED, mServiceIntent);
finish();
return;
}
Log.d(Constants.TAG, "NfcActivity signedHash as hex: " + getHex(signedHash));
// give data through for new service call
// OpenPgpApi.EXTRA_NFC_SIGNED_HASH
mServiceIntent.putExtra("nfc_signed_hash", signedHash);
setResult(RESULT_OK, mServiceIntent);
finish();
} else if (ACTION_DECRYPT_SESSION_KEY.equals(mAction)) {
// If we were supplied with a key id for checking, do so
if (mKeyId != null) {
// For decryption, we check the confidentiality key
long keyId = nfcGetKeyId(mIsoDep, 1);
// If it's wrong, just cancel
if (keyId != mKeyId) {
toast("NFC Tag has wrong encryption key id!");
setResult(RESULT_CANCELED, mServiceIntent);
finish();
return;
}
}
byte[] decryptedSessionKey = nfcDecryptSessionKey(mEncryptedSessionKey);
// give data through for new service call
// OpenPgpApi.EXTRA_NFC_DECRYPTED_SESSION_KEY
mServiceIntent.putExtra("nfc_decrypted_session_key", decryptedSessionKey);
setResult(RESULT_OK, mServiceIntent);
finish();
}
}
/**
* Gets the user ID
*
* @return the user id as "name <email>"
* @throws java.io.IOException
*/
public String getUserId() throws IOException {
String info = "00CA006500";
String data = "00CA005E00";
return getName(card(info)) + " <" + (new String(Hex.decode(getDataField(card(data))))) + ">";
}
/** Return the key id from application specific data stored on tag, or null
* if it doesn't exist.
*
* @param idx Index of the key to return the fingerprint from.
* @return The long key id of the requested key, or null if not found.
*/
public static Long nfcGetKeyId(IsoDep isoDep, int idx) throws IOException {
byte[] fp = nfcGetFingerprint(isoDep, idx);
if (fp == null) {
return null;
}
ByteBuffer buf = ByteBuffer.wrap(fp);
// skip first 12 bytes of the fingerprint
buf.position(12);
// the last eight bytes are the key id (big endian, which is default order in ByteBuffer)
return buf.getLong();
}
/** Return fingerprints of all keys from application specific data stored
* on tag, or null if data not available.
*
* @return The fingerprints of all subkeys in a contiguous byte array.
*/
public static byte[] nfcGetFingerprints(IsoDep isoDep) throws IOException {
String data = "00CA006E00";
byte[] buf = isoDep.transceive(Hex.decode(data));
Iso7816TLV tlv = Iso7816TLV.readSingle(buf, true);
Log.d(Constants.TAG, "nfc tlv data:\n" + tlv.prettyPrint());
Iso7816TLV fptlv = Iso7816TLV.findRecursive(tlv, 0xc5);
if (fptlv == null) {
return null;
}
return fptlv.mV;
}
/** Return the fingerprint from application specific data stored on tag, or
* null if it doesn't exist.
*
* @param idx Index of the key to return the fingerprint from.
* @return The fingerprint of the requested key, or null if not found.
*/
public static byte[] nfcGetFingerprint(IsoDep isoDep, int idx) throws IOException {
byte[] data = nfcGetFingerprints(isoDep);
// return the master key fingerprint
ByteBuffer fpbuf = ByteBuffer.wrap(data);
byte[] fp = new byte[20];
fpbuf.position(idx*20);
fpbuf.get(fp, 0, 20);
return fp;
}
/**
* Calls to calculate the signature and returns the MPI value
*
* @param hash the hash for signing
* @return a big integer representing the MPI for the given hash
* @throws java.io.IOException
*/
public byte[] nfcCalculateSignature(byte[] hash, int hashAlgo) throws IOException {
// dsi, including Lc
String dsi;
Log.i(Constants.TAG, "Hash: " + hashAlgo);
switch (hashAlgo) {
case HashAlgorithmTags.SHA1:
if (hash.length != 20) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 10!");
}
dsi = "23" // Lc
+ "3021" // Tag/Length of Sequence, the 0x21 includes all following 33 bytes
+ "3009" // Tag/Length of Sequence, the 0x09 are the following header bytes
+ "0605" + "2B0E03021A" // OID of SHA1
+ "0500" // TLV coding of ZERO
+ "0414" + getHex(hash); // 0x14 are 20 hash bytes
break;
case HashAlgorithmTags.RIPEMD160:
if (hash.length != 20) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 20!");
}
dsi = "233021300906052B2403020105000414" + getHex(hash);
break;
case HashAlgorithmTags.SHA224:
if (hash.length != 28) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 28!");
}
dsi = "2F302D300D06096086480165030402040500041C" + getHex(hash);
break;
case HashAlgorithmTags.SHA256:
if (hash.length != 32) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 32!");
}
dsi = "333031300D060960864801650304020105000420" + getHex(hash);
break;
case HashAlgorithmTags.SHA384:
if (hash.length != 48) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 48!");
}
dsi = "433041300D060960864801650304020205000430" + getHex(hash);
break;
case HashAlgorithmTags.SHA512:
if (hash.length != 64) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 64!");
}
dsi = "533051300D060960864801650304020305000440" + getHex(hash);
break;
default:
throw new RuntimeException("Not supported hash algo!");
}
// Command APDU for PERFORM SECURITY OPERATION: COMPUTE DIGITAL SIGNATURE (page 37)
String apdu =
"002A9E9A" // CLA, INS, P1, P2
+ dsi // digital signature input
+ "00"; // Le
String response = card(apdu);
// split up response into signature and status
String status = response.substring(response.length()-4);
String signature = response.substring(0, response.length() - 4);
// while we are getting 0x61 status codes, retrieve more data
while (status.substring(0, 2).equals("61")) {
Log.d(Constants.TAG, "requesting more data, status " + status);
// Send GET RESPONSE command
response = card("00C00000" + status.substring(2));
status = response.substring(response.length()-4);
signature += response.substring(0, response.length()-4);
}
Log.d(Constants.TAG, "final response:" + status);
if ( ! status.equals("9000")) {
toast("Bad NFC response code: " + status);
return null;
}
// Make sure the signature we received is actually the expected number of bytes long!
if (signature.length() != 256 && signature.length() != 512) {
toast("Bad signature length! Expected 128 or 256 bytes, got " + signature.length() / 2);
return null;
}
return Hex.decode(signature);
}
/**
* Calls to calculate the signature and returns the MPI value
*
* @param encryptedSessionKey the encoded session key
* @return the decoded session key
* @throws java.io.IOException
*/
public byte[] nfcDecryptSessionKey(byte[] encryptedSessionKey) throws IOException {
String firstApdu = "102a8086fe";
String secondApdu = "002a808603";
String le = "00";
byte[] one = new byte[254];
// leave out first byte:
System.arraycopy(encryptedSessionKey, 1, one, 0, one.length);
byte[] two = new byte[encryptedSessionKey.length - 1 - one.length];
for (int i = 0; i < two.length; i++) {
two[i] = encryptedSessionKey[i + one.length + 1];
}
String first = card(firstApdu + getHex(one));
String second = card(secondApdu + getHex(two) + le);
String decryptedSessionKey = getDataField(second);
Log.d(Constants.TAG, "decryptedSessionKey: " + decryptedSessionKey);
return Hex.decode(decryptedSessionKey);
}
/**
* Prints a message to the screen
*
* @param text the text which should be contained within the toast
*/
private void toast(String text) {
Toast.makeText(this, text, Toast.LENGTH_LONG).show();
}
/**
* Receive new NFC Intents to this activity only by enabling foreground dispatch.
* This can only be done in onResume!
*/
public void enableNfcForegroundDispatch() {
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
Intent nfcI = new Intent(this, NfcActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent nfcPendingIntent = PendingIntent.getActivity(this, 0, nfcI, PendingIntent.FLAG_CANCEL_CURRENT);
IntentFilter[] writeTagFilters = new IntentFilter[]{
new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED)
};
// https://code.google.com/p/android/issues/detail?id=62918
// maybe mNfcAdapter.enableReaderMode(); ?
try {
mNfcAdapter.enableForegroundDispatch(this, nfcPendingIntent, writeTagFilters, null);
} catch (IllegalStateException e) {
Log.i(Constants.TAG, "NfcForegroundDispatch Error!", e);
}
Log.d(Constants.TAG, "NfcForegroundDispatch has been enabled!");
}
/**
* Disable foreground dispatch in onPause!
*/
public void disableNfcForegroundDispatch() {
mNfcAdapter.disableForegroundDispatch(this);
Log.d(Constants.TAG, "NfcForegroundDispatch has been disabled!");
}
/**
* Gets the name of the user out of the raw card output regarding card holder related data
*
* @param name the raw card holder related data from the card
* @return the name given in this data
*/
public String getName(String name) {
String slength;
int ilength;
name = name.substring(6);
slength = name.substring(0, 2);
ilength = Integer.parseInt(slength, 16) * 2;
name = name.substring(2, ilength + 2);
name = (new String(Hex.decode(name))).replace('<', ' ');
return (name);
}
/**
* Reduces the raw data from the card by four characters
*
* @param output the raw data from the card
* @return the data field of that data
*/
private String getDataField(String output) {
return output.substring(0, output.length() - 4);
}
/**
* Communicates with the OpenPgpCard via the APDU
*
* @param hex the hexadecimal APDU
* @return The answer from the card
* @throws java.io.IOException throws an exception if something goes wrong
*/
public String card(String hex) throws IOException {
return getHex(mIsoDep.transceive(Hex.decode(hex)));
}
/**
* Converts a byte array into an hex string
*
* @param raw the byte array representation
* @return the hexadecimal string representation
*/
public static String getHex(byte[] raw) {
return new String(Hex.encode(raw));
}
}