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Code Issues Releases Wiki Activity

Merge openpgp-card lib into OpenKeychain, it was already depending on OK, no need to separate

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This commit is contained in:
Dominik Schürmann 2014-09-24 02:01:53 +02:00
parent f7d49a48cb
commit b373c866e7
12 changed files with 952 additions and 10 deletions
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1
OpenKeychain/build.gradle
View File

@ -19,7 +19,6 @@ dependencies {
compile project(':extern:minidns')
compile project(':extern:KeybaseLib:Lib')
compile project(':extern:TokenAutoComplete:library')
compile project(':extern:openpgp-card-nfc-lib:library')
compile project(':extern:safeslinger-exchange')
}

3
OpenKeychain/src/main/AndroidManifest.xml
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@ -619,6 +619,9 @@
<activity
android:name=".ui.PassphraseDialogActivity"
android:theme="@android:style/Theme.NoDisplay" />
<activity
android:name="ui.NfcActivity"
android:launchMode="singleTop" />
<activity
android:name=".ui.HelpActivity"
android:label="@string/title_help" />

144
OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/NfcSyncPGPContentSignerBuilder.java Normal file
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@ -0,0 +1,144 @@
/**
* Copyright (c) 2013-2014 Philipp Jakubeit, Signe Rüsch, Dominik Schürmann
* Copyright (c) 2000-2013 The Legion of the Bouncy Castle Inc. (http://www.bouncycastle.org)
*
* Licensed under the Bouncy Castle License (MIT license). See LICENSE file for details.
*/
package org.spongycastle.openpgp.operator.jcajce;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPrivateKey;
import org.spongycastle.openpgp.operator.PGPContentSigner;
import org.spongycastle.openpgp.operator.PGPContentSignerBuilder;
import org.spongycastle.openpgp.operator.PGPDigestCalculator;
import java.io.OutputStream;
import java.security.Provider;
import java.util.Date;
/**
* This class is based on JcaPGPContentSignerBuilder.
*
* Instead of using a Signature object based on a privateKey, this class only calculates the digest
* of the output stream and gives the result back using a RuntimeException.
*/
public class NfcSyncPGPContentSignerBuilder
implements PGPContentSignerBuilder
{
private JcaPGPDigestCalculatorProviderBuilder digestCalculatorProviderBuilder = new JcaPGPDigestCalculatorProviderBuilder();
private int hashAlgorithm;
private int keyAlgorithm;
private long keyID;
private byte[] signedHash;
private Date creationTimestamp;
public static class NfcInteractionNeeded extends RuntimeException
{
public byte[] hashToSign;
public Date creationTimestamp;
public int hashAlgo;
public NfcInteractionNeeded(byte[] hashToSign, int hashAlgo, Date creationTimestamp)
{
super("NFC interaction required!");
this.hashToSign = hashToSign;
this.hashAlgo = hashAlgo;
this.creationTimestamp = creationTimestamp;
}
}
public NfcSyncPGPContentSignerBuilder(int keyAlgorithm, int hashAlgorithm, long keyID, byte[] signedHash, Date creationTimestamp)
{
this.keyAlgorithm = keyAlgorithm;
this.hashAlgorithm = hashAlgorithm;
this.keyID = keyID;
this.signedHash = signedHash;
this.creationTimestamp = creationTimestamp;
}
public NfcSyncPGPContentSignerBuilder setProvider(Provider provider)
{
digestCalculatorProviderBuilder.setProvider(provider);
return this;
}
public NfcSyncPGPContentSignerBuilder setProvider(String providerName)
{
digestCalculatorProviderBuilder.setProvider(providerName);
return this;
}
public NfcSyncPGPContentSignerBuilder setDigestProvider(Provider provider)
{
digestCalculatorProviderBuilder.setProvider(provider);
return this;
}
public NfcSyncPGPContentSignerBuilder setDigestProvider(String providerName)
{
digestCalculatorProviderBuilder.setProvider(providerName);
return this;
}
public PGPContentSigner build(final int signatureType, PGPPrivateKey privateKey)
throws PGPException {
// NOTE: privateKey is null in this case!
return build(signatureType, keyID);
}
public PGPContentSigner build(final int signatureType, final long keyID)
throws PGPException
{
final PGPDigestCalculator digestCalculator = digestCalculatorProviderBuilder.build().get(hashAlgorithm);
return new PGPContentSigner()
{
public int getType()
{
return signatureType;
}
public int getHashAlgorithm()
{
return hashAlgorithm;
}
public int getKeyAlgorithm()
{
return keyAlgorithm;
}
public long getKeyID()
{
return keyID;
}
public OutputStream getOutputStream()
{
return digestCalculator.getOutputStream();
}
public byte[] getSignature() {
if (signedHash != null) {
// we already have the signed hash from a previous execution, return this!
return signedHash;
} else {
// catch this when signatureGenerator.generate() is executed and divert digest to card,
// when doing the operation again reuse creationTimestamp (this will be hashed)
throw new NfcInteractionNeeded(digestCalculator.getDigest(), getHashAlgorithm(), creationTimestamp);
}
}
public byte[] getDigest()
{
return digestCalculator.getDigest();
}
};
}
}

275
OpenKeychain/src/main/java/org/spongycastle/openpgp/operator/jcajce/NfcSyncPublicKeyDataDecryptorFactoryBuilder.java Normal file
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@ -0,0 +1,275 @@
/**
* 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.spongycastle.openpgp.operator.jcajce;
import org.spongycastle.bcpg.PublicKeyAlgorithmTags;
import org.spongycastle.jcajce.util.DefaultJcaJceHelper;
import org.spongycastle.jcajce.util.NamedJcaJceHelper;
import org.spongycastle.jcajce.util.ProviderJcaJceHelper;
import org.spongycastle.openpgp.PGPException;
import org.spongycastle.openpgp.PGPPublicKey;
import org.spongycastle.openpgp.operator.PGPDataDecryptor;
import org.spongycastle.openpgp.operator.PublicKeyDataDecryptorFactory;
import java.security.Provider;
/**
* This class is based on JcePublicKeyDataDecryptorFactoryBuilder
*
*/
public class NfcSyncPublicKeyDataDecryptorFactoryBuilder
{
private OperatorHelper helper = new OperatorHelper(new DefaultJcaJceHelper());
private OperatorHelper contentHelper = new OperatorHelper(new DefaultJcaJceHelper());
private JcaPGPKeyConverter keyConverter = new JcaPGPKeyConverter();
// private JcaPGPDigestCalculatorProviderBuilder digestCalculatorProviderBuilder = new JcaPGPDigestCalculatorProviderBuilder();
// private JcaKeyFingerprintCalculator fingerprintCalculator = new JcaKeyFingerprintCalculator();
public static class NfcInteractionNeeded extends RuntimeException
{
public byte[] encryptedSessionKey;
public NfcInteractionNeeded(byte[] encryptedSessionKey)
{
super("NFC interaction required!");
this.encryptedSessionKey = encryptedSessionKey;
}
}
public NfcSyncPublicKeyDataDecryptorFactoryBuilder()
{
}
/**
* Set the provider object to use for creating cryptographic primitives in the resulting factory the builder produces.
*
* @param provider provider object for cryptographic primitives.
* @return the current builder.
*/
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setProvider(Provider provider)
{
this.helper = new OperatorHelper(new ProviderJcaJceHelper(provider));
keyConverter.setProvider(provider);
this.contentHelper = helper;
return this;
}
/**
* Set the provider name to use for creating cryptographic primitives in the resulting factory the builder produces.
*
* @param providerName the name of the provider to reference for cryptographic primitives.
* @return the current builder.
*/
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setProvider(String providerName)
{
this.helper = new OperatorHelper(new NamedJcaJceHelper(providerName));
keyConverter.setProvider(providerName);
this.contentHelper = helper;
return this;
}
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setContentProvider(Provider provider)
{
this.contentHelper = new OperatorHelper(new ProviderJcaJceHelper(provider));
return this;
}
public NfcSyncPublicKeyDataDecryptorFactoryBuilder setContentProvider(String providerName)
{
this.contentHelper = new OperatorHelper(new NamedJcaJceHelper(providerName));
return this;
}
public PublicKeyDataDecryptorFactory build(final byte[] nfcDecrypted) {
return new PublicKeyDataDecryptorFactory()
{
public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData)
throws PGPException
{
if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH)
{
throw new PGPException("ECDH not supported!");
}
return decryptSessionData(keyAlgorithm, secKeyData, nfcDecrypted);
}
public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
throws PGPException
{
return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
}
};
}
// public PublicKeyDataDecryptorFactory build(final PrivateKey privKey)
// {
// return new PublicKeyDataDecryptorFactory()
// {
// public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData)
// throws PGPException
// {
// if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH)
// {
// throw new PGPException("ECDH requires use of PGPPrivateKey for decryption");
// }
// return decryptSessionData(keyAlgorithm, privKey, secKeyData);
// }
//
// public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
// throws PGPException
// {
// return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
// }
// };
// }
// public PublicKeyDataDecryptorFactory build(final PGPPrivateKey privKey, final byte[] nfcDecrypted)
// {
// return new PublicKeyDataDecryptorFactory()
// {
// public byte[] recoverSessionData(int keyAlgorithm, byte[][] secKeyData)
// throws PGPException
// {
// if (keyAlgorithm == PublicKeyAlgorithmTags.ECDH)
// {
// return decryptSessionData(privKey.getPrivateKeyDataPacket(), privKey.getPublicKeyPacket(), secKeyData);
// }
//
// return decryptSessionData(keyAlgorithm, keyConverter.getPrivateKey(privKey), secKeyData, nfcDecrypted);
// }
//
// public PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
// throws PGPException
// {
// return contentHelper.createDataDecryptor(withIntegrityPacket, encAlgorithm, key);
// }
// };
// }
// private byte[] decryptSessionData(BCPGKey privateKeyPacket, PublicKeyPacket pubKeyData, byte[][] secKeyData)
// throws PGPException
// {
// ECDHPublicBCPGKey ecKey = (ECDHPublicBCPGKey)pubKeyData.getKey();
// X9ECParameters x9Params = NISTNamedCurves.getByOID(ecKey.getCurveOID());
//
// byte[] enc = secKeyData[0];
//
// int pLen = ((((enc[0] & 0xff) << 8) + (enc[1] & 0xff)) + 7) / 8;
// byte[] pEnc = new byte[pLen];
//
// System.arraycopy(enc, 2, pEnc, 0, pLen);
//
// byte[] keyEnc = new byte[enc[pLen + 2]];
//
// System.arraycopy(enc, 2 + pLen + 1, keyEnc, 0, keyEnc.length);
//
// Cipher c = helper.createKeyWrapper(ecKey.getSymmetricKeyAlgorithm());
//
// ECPoint S = x9Params.getCurve().decodePoint(pEnc).multiply(((ECSecretBCPGKey)privateKeyPacket).getX()).normalize();
//
// RFC6637KDFCalculator rfc6637KDFCalculator = new RFC6637KDFCalculator(digestCalculatorProviderBuilder.build().get(ecKey.getHashAlgorithm()), ecKey.getSymmetricKeyAlgorithm());
// Key key = new SecretKeySpec(rfc6637KDFCalculator.createKey(ecKey.getCurveOID(), S, fingerprintCalculator.calculateFingerprint(pubKeyData)), "AESWrap");
//
// try
// {
// c.init(Cipher.UNWRAP_MODE, key);
//
// Key paddedSessionKey = c.unwrap(keyEnc, "Session", Cipher.SECRET_KEY);
//
// return PGPPad.unpadSessionData(paddedSessionKey.getEncoded());
// }
// catch (InvalidKeyException e)
// {
// throw new PGPException("error setting asymmetric cipher", e);
// }
// catch (NoSuchAlgorithmException e)
// {
// throw new PGPException("error setting asymmetric cipher", e);
// }
// }
private byte[] decryptSessionData(int keyAlgorithm, byte[][] secKeyData, byte[] nfcDecrypted)
throws PGPException
{
// Cipher c1 = helper.createPublicKeyCipher(keyAlgorithm);
//
// try
// {
// c1.init(Cipher.DECRYPT_MODE, privKey);
// }
// catch (InvalidKeyException e)
// {
// throw new PGPException("error setting asymmetric cipher", e);
// }
if (keyAlgorithm == PGPPublicKey.RSA_ENCRYPT
|| keyAlgorithm == PGPPublicKey.RSA_GENERAL)
{
byte[] bi = secKeyData[0]; // encoded MPI
if (nfcDecrypted != null) {
// we already have the decrypted bytes from a previous execution, return this!
return nfcDecrypted;
} else {
// catch this when decryptSessionData() is executed and divert digest to card,
// when doing the operation again reuse nfcDecrypted
throw new NfcInteractionNeeded(bi);
}
// c1.update(bi, 2, bi.length - 2);
}
else
{
throw new PGPException("ElGamal not supported!");
// ElGamalKey k = (ElGamalKey)privKey;
// int size = (k.getParameters().getP().bitLength() + 7) / 8;
// byte[] tmp = new byte[size];
//
// byte[] bi = secKeyData[0]; // encoded MPI
// if (bi.length - 2 > size) // leading Zero? Shouldn't happen but...
// {
// c1.update(bi, 3, bi.length - 3);
// }
// else
// {
// System.arraycopy(bi, 2, tmp, tmp.length - (bi.length - 2), bi.length - 2);
// c1.update(tmp);
// }
//
// bi = secKeyData[1]; // encoded MPI
// for (int i = 0; i != tmp.length; i++)
// {
// tmp[i] = 0;
// }
//
// if (bi.length - 2 > size) // leading Zero? Shouldn't happen but...
// {
// c1.update(bi, 3, bi.length - 3);
// }
// else
// {
// System.arraycopy(bi, 2, tmp, tmp.length - (bi.length - 2), bi.length - 2);
// c1.update(tmp);
// }
}
// try
// {
// return c1.doFinal();
// }
// catch (Exception e)
// {
// throw new PGPException("exception decrypting session data", e);
// }
}
}

3
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java
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@ -31,10 +31,9 @@ import org.openintents.openpgp.OpenPgpError;
import org.openintents.openpgp.OpenPgpSignatureResult;
import org.openintents.openpgp.util.OpenPgpApi;
import org.spongycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.nfc.NfcActivity;
import org.sufficientlysecure.keychain.ui.NfcActivity;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.pgp.PassphraseCacheInterface;
import org.sufficientlysecure.keychain.pgp.PassphraseCacheInterface.NoSecretKeyException;
import org.sufficientlysecure.keychain.pgp.PgpDecryptVerify;
import org.sufficientlysecure.keychain.provider.CachedPublicKeyRing;
import org.sufficientlysecure.keychain.provider.KeychainDatabase.Tables;

1
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFragment.java
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@ -30,7 +30,6 @@ import android.widget.TextView;
import org.openintents.openpgp.OpenPgpSignatureResult;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.nfc.NfcActivity;
import org.sufficientlysecure.keychain.pgp.KeyRing;
import org.sufficientlysecure.keychain.service.results.DecryptVerifyResult;
import org.sufficientlysecure.keychain.ui.util.KeyFormattingUtils;

4
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptActivity.java
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@ -2,10 +2,6 @@ package org.sufficientlysecure.keychain.ui;
import android.content.Intent;
import org.sufficientlysecure.keychain.nfc.NfcActivity;
import java.util.Date;
public class EncryptActivity extends DrawerActivity {
public static final int REQUEST_CODE_PASSPHRASE = 0x00008001;

498
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/NfcActivity.java Normal file
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@ -0,0 +1,498 @@
/**
* 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.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.WindowManager;
import android.widget.Toast;
import org.spongycastle.bcpg.HashAlgorithmTags;
import org.spongycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.R;
import java.io.IOException;
import java.util.Locale;
/**
* 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 ActionBarActivity {
private static final String TAG = "Keychain";
// 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_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;
// sign
private byte[] mHashToSign;
private int mHashAlgo;
// decrypt
private byte[] mEncryptedSessionKey;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "NfcActivity.onCreate");
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.nfc_activity);
Intent intent = getIntent();
Bundle data = intent.getExtras();
String action = intent.getAction();
if (ACTION_SIGN_HASH.equals(action)) {
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(TAG, "NfcActivity mAction: " + mAction);
Log.d(TAG, "NfcActivity mPin: " + mPin);
Log.d(TAG, "NfcActivity mHashToSign as hex: " + getHex(mHashToSign));
Log.d(TAG, "NfcActivity mServiceIntent: " + mServiceIntent.toString());
} else if (ACTION_DECRYPT_SESSION_KEY.equals(action)) {
mAction = action;
mPin = data.getString(EXTRA_PIN);
mEncryptedSessionKey = data.getByteArray(EXTRA_NFC_ENC_SESSION_KEY);
mServiceIntent = data.getParcelable(EXTRA_DATA);
Log.d(TAG, "NfcActivity mAction: " + mAction);
Log.d(TAG, "NfcActivity mPin: " + mPin);
Log.d(TAG, "NfcActivity mEncryptedSessionKey as hex: " + getHex(mEncryptedSessionKey));
Log.d(TAG, "NfcActivity mServiceIntent: " + mServiceIntent.toString());
} else if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) {
Log.e(TAG, "This should not happen, but there is a bug in Android!");
toast("This should not happen, but there is a bug in Android! Clear all app tasks and start app from launcher again!");
finish();
} else {
Log.d(TAG, "Action not supported: " + action);
}
}
/**
* Called when the system is about to start resuming a previous activity,
* disables NFC Foreground Dispatch
*/
public void onPause() {
super.onPause();
Log.d(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(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(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)
+ "06" // Lc TODO should be length of PIN?
+ 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)) {
// returns signed hash
byte[] signedHash = nfcCalculateSignature(mHashToSign, mHashAlgo);
if (signedHash == null) {
setResult(RESULT_CANCELED, mServiceIntent);
finish();
return;
}
Log.d(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)) {
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))))) + ">";
}
/**
* Gets the long key ID
*
* @return the long key id (last 16 bytes of the fingerprint)
* @throws java.io.IOException
*/
public long getKeyId() throws IOException {
String keyId = getFingerprint().substring(24);
Log.d(TAG, "keyId: " + keyId);
return Long.parseLong(keyId, 16);
}
/**
* Gets the fingerprint of the signature key
*
* @return the fingerprint
* @throws java.io.IOException
*/
public String getFingerprint() throws IOException {
String data = "00CA006E00";
String fingerprint = card(data);
fingerprint = fingerprint.toLowerCase(Locale.ENGLISH); // better enforce lower case
fingerprint = fingerprint.substring(fingerprint.indexOf("c5") + 4, fingerprint.indexOf("c5") + 44);
Log.d(TAG, "fingerprint: " + fingerprint);
return fingerprint;
}
/**
* 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(TAG, "Hash: " + hashAlgo);
switch (hashAlgo) {
case HashAlgorithmTags.SHA1:
if (hash.length != 20) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 10!");
}
dsi = "30" // Lc TODO 0x30 == 48. shouldn't this be 35, for 15 header bytes + 20 hash?
+ "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 = "303021300906052B2403020105000414" + getHex(hash);
break;
case HashAlgorithmTags.SHA224:
if (hash.length != 28) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 28!");
}
dsi = "34302D300D06096086480165030402040500041C" + 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 = "343041300D060960864801650304020205000430" + getHex(hash);
break;
case HashAlgorithmTags.SHA512:
if (hash.length != 64) {
throw new RuntimeException("Bad hash length (" + hash.length + ", expected 64!");
}
dsi = "343051300D060960864801650304020305000440" + 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(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(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() != 512) {
toast("Bad signature length! Expected 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(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(TAG, "NfcForegroundDispatch Error!", e);
}
Log.d(TAG, "NfcForegroundDispatch has been enabled!");
}
/**
* Disable foreground dispatch in onPause!
*/
public void disableNfcForegroundDispatch() {
mNfcAdapter.disableForegroundDispatch(this);
Log.d(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));
}
}

BIN
OpenKeychain/src/main/res/drawable/yubikey_neo.png Normal file
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Width:  |  Height:  |  Size: 129 KiB

30
OpenKeychain/src/main/res/layout/nfc_activity.xml Normal file
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@ -0,0 +1,30 @@
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="8dp"
android:paddingBottom="8dp"
android:background="#FFFFFFFF"
tools:context="org.sufficientlysecure.keychain.nfc.NfcActivityFull">
<TextView
android:text="Hold Yubikey against the back of your device!"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="@android:style/TextAppearance.Large"
android:id="@+id/textView"
android:gravity="center"
android:layout_gravity="center" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView"
android:src="@drawable/yubikey_neo"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_below="@+id/textView" />
</RelativeLayout>

2
extern/openpgp-card-nfc-lib vendored

@ -1 +1 @@
Subproject commit 6bc1f1240f9700e5bd378f02540360ef20dea629
Subproject commit dc2701e415aa01c811b093f152409a231475e506

1
settings.gradle
View File

@ -13,5 +13,4 @@ include ':extern:SuperToasts:supertoasts'
include ':extern:minidns'
include ':extern:KeybaseLib:Lib'
include ':extern:TokenAutoComplete:library'
include ':extern:openpgp-card-nfc-lib:library'
include ':extern:safeslinger-exchange'