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Extract OpenPGP card operation logic from SecurityTokenConnection class

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This commit is contained in:
Vincent Breitmoser
2018-01-12 02:02:29 +01:00
parent 04037ed0b4
commit 1ed2cae2b0
6 changed files with 569 additions and 493 deletions
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165
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/PsoDecryptUseCase.java Normal file
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@@ -0,0 +1,165 @@
package org.sufficientlysecure.keychain.securitytoken;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import android.support.annotation.NonNull;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.asn1.nist.NISTNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.jcajce.util.MessageDigestUtils;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.operator.PGPPad;
import org.bouncycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.pgp.CanonicalizedPublicKey;
public class PsoDecryptUseCase {
private final SecurityTokenConnection connection;
private final JcaKeyFingerprintCalculator fingerprintCalculator;
public static PsoDecryptUseCase create(SecurityTokenConnection connection) {
return new PsoDecryptUseCase(connection);
}
private PsoDecryptUseCase(SecurityTokenConnection connection) {
this.connection = connection;
this.fingerprintCalculator = new JcaKeyFingerprintCalculator();
}
public byte[] decryptSessionKey(@NonNull byte[] encryptedSessionKey,
CanonicalizedPublicKey publicKey)
throws IOException {
final KeyFormat kf = connection.getOpenPgpCapabilities().getFormatForKeyType(KeyType.ENCRYPT);
connection.verifyPinForOther();
byte[] data;
byte[] dataLen;
int pLen = 0;
X9ECParameters x9Params;
switch (kf.keyFormatType()) {
case RSAKeyFormatType:
data = Arrays.copyOfRange(encryptedSessionKey, 2, encryptedSessionKey.length);
if (data[0] != 0) {
data = Arrays.prepend(data, (byte) 0x00);
}
break;
case ECKeyFormatType:
pLen = ((((encryptedSessionKey[0] & 0xff) << 8) + (encryptedSessionKey[1] & 0xff)) + 7) / 8;
data = new byte[pLen];
System.arraycopy(encryptedSessionKey, 2, data, 0, pLen);
final ECKeyFormat eckf = (ECKeyFormat) kf;
x9Params = NISTNamedCurves.getByOID(eckf.getCurveOID());
final ECPoint p = x9Params.getCurve().decodePoint(data);
if (!p.isValid()) {
throw new CardException("Invalid EC point!");
}
data = p.getEncoded(false);
if (data.length < 128) {
dataLen = new byte[]{(byte) data.length};
} else {
dataLen = new byte[]{(byte) 0x81, (byte) data.length};
}
data = Arrays.concatenate(Hex.decode("86"), dataLen, data);
if (data.length < 128) {
dataLen = new byte[]{(byte) data.length};
} else {
dataLen = new byte[]{(byte) 0x81, (byte) data.length};
}
data = Arrays.concatenate(Hex.decode("7F49"), dataLen, data);
if (data.length < 128) {
dataLen = new byte[]{(byte) data.length};
} else {
dataLen = new byte[]{(byte) 0x81, (byte) data.length};
}
data = Arrays.concatenate(Hex.decode("A6"), dataLen, data);
break;
default:
throw new CardException("Unknown encryption key type!");
}
CommandApdu command = connection.getCommandFactory().createDecipherCommand(data);
ResponseApdu response = connection.communicate(command);
if (!response.isSuccess()) {
throw new CardException("Deciphering with Security token failed on receive", response.getSw());
}
switch (connection.getOpenPgpCapabilities().getFormatForKeyType(KeyType.ENCRYPT).keyFormatType()) {
case RSAKeyFormatType:
return response.getData();
/* From 3.x OpenPGP card specification :
In case of ECDH the card supports a partial decrypt only.
With its own private key and the given public key the card calculates a shared secret
in compliance with the Elliptic Curve Key Agreement Scheme from Diffie-Hellman.
The shared secret is returned in the response, all other calculation for deciphering
are done outside of the card.
The shared secret obtained is a KEK (Key Encryption Key) that is used to wrap the
session key.
From rfc6637#section-13 :
This document explicitly discourages the use of algorithms other than AES as a KEK algorithm.
*/
case ECKeyFormatType:
data = response.getData();
final byte[] keyEnc = new byte[encryptedSessionKey[pLen + 2]];
System.arraycopy(encryptedSessionKey, 2 + pLen + 1, keyEnc, 0, keyEnc.length);
try {
final MessageDigest kdf = MessageDigest.getInstance(MessageDigestUtils.getDigestName(publicKey.getSecurityTokenHashAlgorithm()));
kdf.update(new byte[]{(byte) 0, (byte) 0, (byte) 0, (byte) 1});
kdf.update(data);
kdf.update(publicKey.createUserKeyingMaterial(fingerprintCalculator));
final byte[] kek = kdf.digest();
final Cipher c = Cipher.getInstance("AESWrap");
c.init(Cipher.UNWRAP_MODE, new SecretKeySpec(kek, 0, publicKey.getSecurityTokenSymmetricKeySize() / 8, "AES"));
final Key paddedSessionKey = c.unwrap(keyEnc, "Session", Cipher.SECRET_KEY);
Arrays.fill(kek, (byte) 0);
return PGPPad.unpadSessionData(paddedSessionKey.getEncoded());
} catch (NoSuchAlgorithmException e) {
throw new CardException("Unknown digest/encryption algorithm!");
} catch (NoSuchPaddingException e) {
throw new CardException("Unknown padding algorithm!");
} catch (PGPException e) {
throw new CardException(e.getMessage());
} catch (InvalidKeyException e) {
throw new CardException("Invalid KEK!");
}
default:
throw new CardException("Unknown encryption key type!");
}
}
}

177
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenChangeKeyUseCase.java Normal file
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@@ -0,0 +1,177 @@
package org.sufficientlysecure.keychain.securitytoken;
import java.io.IOException;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.interfaces.RSAPrivateCrtKey;
import android.support.annotation.VisibleForTesting;
import org.sufficientlysecure.keychain.pgp.CanonicalizedSecretKey;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import org.sufficientlysecure.keychain.util.Passphrase;
public class SecurityTokenChangeKeyUseCase {
private static final byte[] BLANK_FINGERPRINT = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
private final SecurityTokenConnection connection;
public static SecurityTokenChangeKeyUseCase create(SecurityTokenConnection stConnection) {
return new SecurityTokenChangeKeyUseCase(stConnection);
}
private SecurityTokenChangeKeyUseCase(SecurityTokenConnection connection) {
this.connection = connection;
}
public void changeKey(CanonicalizedSecretKey secretKey, Passphrase passphrase, Passphrase adminPin) throws IOException {
long keyGenerationTimestamp = secretKey.getCreationTime().getTime() / 1000;
byte[] timestampBytes = ByteBuffer.allocate(4).putInt((int) keyGenerationTimestamp).array();
KeyType keyType = KeyType.from(secretKey);
if (keyType == null) {
throw new IOException("Inappropriate key flags for smart card key.");
}
// Slot is empty, or contains this key already. PUT KEY operation is safe
boolean canPutKey = isSlotEmpty(keyType)
|| keyMatchesFingerPrint(keyType, secretKey.getFingerprint());
if (!canPutKey) {
throw new IOException(String.format("Key slot occupied; card must be reset to put new %s key.",
keyType.toString()));
}
putKey(keyType, secretKey, passphrase, adminPin);
putData(adminPin, keyType.getFingerprintObjectId(), secretKey.getFingerprint());
putData(adminPin, keyType.getTimestampObjectId(), timestampBytes);
}
/**
* Puts a key on the token in the given slot.
*
* @param slot The slot on the token where the key should be stored:
* 0xB6: Signature Key
* 0xB8: Decipherment Key
* 0xA4: Authentication Key
*/
@VisibleForTesting
void putKey(KeyType slot, CanonicalizedSecretKey secretKey, Passphrase passphrase, Passphrase adminPin)
throws IOException {
RSAPrivateCrtKey crtSecretKey;
ECPrivateKey ecSecretKey;
ECPublicKey ecPublicKey;
connection.verifyAdminPin(adminPin);
// Now we're ready to communicate with the token.
byte[] keyBytes;
try {
secretKey.unlock(passphrase);
OpenPgpCapabilities openPgpCapabilities = connection.getOpenPgpCapabilities();
setKeyAttributes(adminPin, slot, SecurityTokenUtils.attributesFromSecretKey(slot, secretKey,
openPgpCapabilities.getFormatForKeyType(slot)));
KeyFormat formatForKeyType = openPgpCapabilities.getFormatForKeyType(slot);
switch (formatForKeyType.keyFormatType()) {
case RSAKeyFormatType:
if (!secretKey.isRSA()) {
throw new IOException("Security Token not configured for RSA key.");
}
crtSecretKey = secretKey.getSecurityTokenRSASecretKey();
// Should happen only rarely; all GnuPG keys since 2006 use public exponent 65537.
if (!crtSecretKey.getPublicExponent().equals(new BigInteger("65537"))) {
throw new IOException("Invalid public exponent for smart Security Token.");
}
keyBytes = SecurityTokenUtils.createRSAPrivKeyTemplate(crtSecretKey, slot,
(RSAKeyFormat) formatForKeyType);
break;
case ECKeyFormatType:
if (!secretKey.isEC()) {
throw new IOException("Security Token not configured for EC key.");
}
secretKey.unlock(passphrase);
ecSecretKey = secretKey.getSecurityTokenECSecretKey();
ecPublicKey = secretKey.getSecurityTokenECPublicKey();
keyBytes = SecurityTokenUtils.createECPrivKeyTemplate(ecSecretKey, ecPublicKey, slot,
(ECKeyFormat) formatForKeyType);
break;
default:
throw new IOException("Key type unsupported by security token.");
}
} catch (PgpGeneralException e) {
throw new IOException(e.getMessage());
}
CommandApdu apdu = connection.getCommandFactory().createPutKeyCommand(keyBytes);
ResponseApdu response = connection.communicate(apdu);
if (!response.isSuccess()) {
throw new CardException("Key export to Security Token failed", response.getSw());
}
}
private void setKeyAttributes(Passphrase adminPin, KeyType keyType, byte[] data) throws IOException {
if (!connection.getOpenPgpCapabilities().isAttributesChangable()) {
return;
}
putData(adminPin, keyType.getAlgoAttributeSlot(), data);
connection.refreshConnectionCapabilities();
}
/**
* Stores a data object on the token. Automatically validates the proper PIN for the operation.
* Supported for all data objects < 255 bytes in length. Only the cardholder certificate
* (0x7F21) can exceed this length.
*
* @param dataObject The data object to be stored.
* @param data The data to store in the object
*/
private void putData(Passphrase adminPin, int dataObject, byte[] data) throws IOException {
if (data.length > 254) {
throw new IOException("Cannot PUT DATA with length > 254");
}
// TODO use admin pin regardless, if we have it?
if (dataObject == 0x0101 || dataObject == 0x0103) {
connection.verifyPinForOther();
} else {
connection.verifyAdminPin(adminPin);
}
CommandApdu command = connection.getCommandFactory().createPutDataCommand(dataObject, data);
ResponseApdu response = connection.communicate(command);
if (!response.isSuccess()) {
throw new CardException("Failed to put data.", response.getSw());
}
}
private boolean isSlotEmpty(KeyType keyType) throws IOException {
// Note: special case: This should not happen, but happens with
// https://github.com/FluffyKaon/OpenPGP-Card, thus for now assume true
if (connection.getKeyFingerprint(keyType) == null) {
return true;
}
return keyMatchesFingerPrint(keyType, BLANK_FINGERPRINT);
}
private boolean keyMatchesFingerPrint(KeyType keyType, byte[] fingerprint) throws IOException {
return java.util.Arrays.equals(connection.getKeyFingerprint(keyType), fingerprint);
}
}

522
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenConnection.java
View File

@@ -17,52 +17,23 @@
package org.sufficientlysecure.keychain.securitytoken;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.annotation.VisibleForTesting;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1OutputStream;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.nist.NISTNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.bcpg.HashAlgorithmTags;
import org.bouncycastle.jcajce.util.MessageDigestUtils;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.operator.PGPPad;
import org.bouncycastle.openpgp.operator.jcajce.JcaKeyFingerprintCalculator;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.pgp.CanonicalizedPublicKey;
import org.sufficientlysecure.keychain.pgp.CanonicalizedSecretKey;
import org.sufficientlysecure.keychain.pgp.exception.PgpGeneralException;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.SecretKeySpec;
import org.sufficientlysecure.keychain.securitytoken.SecurityTokenInfo.TokenType;
import org.sufficientlysecure.keychain.securitytoken.SecurityTokenInfo.TransportType;
import org.sufficientlysecure.keychain.util.Log;
import org.sufficientlysecure.keychain.util.Passphrase;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.interfaces.RSAPrivateCrtKey;
import java.util.List;
/**
* This class provides a communication interface to OpenPGP applications on ISO SmartCard compliant
@@ -74,12 +45,8 @@ public class SecurityTokenConnection {
private static final String AID_PREFIX_FIDESMO = "A000000617";
private static final byte[] BLANK_FINGERPRINT = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
private static SecurityTokenConnection sCachedInstance;
private final JcaKeyFingerprintCalculator fingerprintCalculator = new JcaKeyFingerprintCalculator();
@NonNull
private final Transport mTransport;
@Nullable
@@ -120,6 +87,20 @@ public class SecurityTokenConnection {
this.commandFactory = commandFactory;
}
OpenPgpCapabilities getOpenPgpCapabilities() {
return mOpenPgpCapabilities;
}
OpenPgpCommandApduFactory getCommandFactory() {
return commandFactory;
}
void maybeInvalidatePw1() {
if (!mOpenPgpCapabilities.isPw1ValidForMultipleSignatures()) {
mPw1ValidatedForSignature = false;
}
}
private String getHolderName(byte[] name) {
try {
return (new String(name, 4, name[3])).replace('<', ' ');
@@ -133,43 +114,6 @@ public class SecurityTokenConnection {
}
}
public void changeKey(CanonicalizedSecretKey secretKey, Passphrase passphrase, Passphrase adminPin) throws IOException {
long keyGenerationTimestamp = secretKey.getCreationTime().getTime() / 1000;
byte[] timestampBytes = ByteBuffer.allocate(4).putInt((int) keyGenerationTimestamp).array();
KeyType keyType = KeyType.from(secretKey);
if (keyType == null) {
throw new IOException("Inappropriate key flags for smart card key.");
}
// Slot is empty, or contains this key already. PUT KEY operation is safe
boolean canPutKey = isSlotEmpty(keyType)
|| keyMatchesFingerPrint(keyType, secretKey.getFingerprint());
if (!canPutKey) {
throw new IOException(String.format("Key slot occupied; card must be reset to put new %s key.",
keyType.toString()));
}
putKey(keyType, secretKey, passphrase, adminPin);
putData(adminPin, keyType.getFingerprintObjectId(), secretKey.getFingerprint());
putData(adminPin, keyType.getTimestampObjectId(), timestampBytes);
}
private boolean isSlotEmpty(KeyType keyType) throws IOException {
// Note: special case: This should not happen, but happens with
// https://github.com/FluffyKaon/OpenPGP-Card, thus for now assume true
if (getKeyFingerprint(keyType) == null) {
return true;
}
return keyMatchesFingerPrint(keyType, BLANK_FINGERPRINT);
}
private boolean keyMatchesFingerPrint(KeyType keyType, byte[] fingerprint) throws IOException {
return java.util.Arrays.equals(getKeyFingerprint(keyType), fingerprint);
}
public void connectIfNecessary(Context context) throws IOException {
if (isConnected()) {
return;
@@ -239,7 +183,7 @@ public class SecurityTokenConnection {
tokenType = TokenType.UNKNOWN;
}
private void refreshConnectionCapabilities() throws IOException {
void refreshConnectionCapabilities() throws IOException {
byte[] rawOpenPgpCapabilities = getData(0x00, 0x6E);
OpenPgpCapabilities openPgpCapabilities = new OpenPgpCapabilities(rawOpenPgpCapabilities);
@@ -299,145 +243,14 @@ public class SecurityTokenConnection {
}
}
/**
* Call DECIPHER command
*
* @param encryptedSessionKey the encoded session key
* @param publicKey
* @return the decoded session key
*/
public byte[] decryptSessionKey(@NonNull byte[] encryptedSessionKey,
CanonicalizedPublicKey publicKey)
throws IOException {
final KeyFormat kf = mOpenPgpCapabilities.getFormatForKeyType(KeyType.ENCRYPT);
if (!mPw1ValidatedForDecrypt) {
verifyPinForOther();
}
byte[] data;
byte[] dataLen;
int pLen = 0;
X9ECParameters x9Params;
switch (kf.keyFormatType()) {
case RSAKeyFormatType:
data = Arrays.copyOfRange(encryptedSessionKey, 2, encryptedSessionKey.length);
if (data[0] != 0) {
data = Arrays.prepend(data, (byte) 0x00);
}
break;
case ECKeyFormatType:
pLen = ((((encryptedSessionKey[0] & 0xff) << 8) + (encryptedSessionKey[1] & 0xff)) + 7) / 8;
data = new byte[pLen];
System.arraycopy(encryptedSessionKey, 2, data, 0, pLen);
final ECKeyFormat eckf = (ECKeyFormat) kf;
x9Params = NISTNamedCurves.getByOID(eckf.getCurveOID());
final ECPoint p = x9Params.getCurve().decodePoint(data);
if (!p.isValid()) {
throw new CardException("Invalid EC point!");
}
data = p.getEncoded(false);
if (data.length < 128) {
dataLen = new byte[]{(byte) data.length};
} else {
dataLen = new byte[]{(byte) 0x81, (byte) data.length};
}
data = Arrays.concatenate(Hex.decode("86"), dataLen, data);
if (data.length < 128) {
dataLen = new byte[]{(byte) data.length};
} else {
dataLen = new byte[]{(byte) 0x81, (byte) data.length};
}
data = Arrays.concatenate(Hex.decode("7F49"), dataLen, data);
if (data.length < 128) {
dataLen = new byte[]{(byte) data.length};
} else {
dataLen = new byte[]{(byte) 0x81, (byte) data.length};
}
data = Arrays.concatenate(Hex.decode("A6"), dataLen, data);
break;
default:
throw new CardException("Unknown encryption key type!");
}
CommandApdu command = commandFactory.createDecipherCommand(data);
ResponseApdu response = communicate(command);
if (!response.isSuccess()) {
throw new CardException("Deciphering with Security token failed on receive", response.getSw());
}
switch (mOpenPgpCapabilities.getFormatForKeyType(KeyType.ENCRYPT).keyFormatType()) {
case RSAKeyFormatType:
return response.getData();
/* From 3.x OpenPGP card specification :
In case of ECDH the card supports a partial decrypt only.
With its own private key and the given public key the card calculates a shared secret
in compliance with the Elliptic Curve Key Agreement Scheme from Diffie-Hellman.
The shared secret is returned in the response, all other calculation for deciphering
are done outside of the card.
The shared secret obtained is a KEK (Key Encryption Key) that is used to wrap the
session key.
From rfc6637#section-13 :
This document explicitly discourages the use of algorithms other than AES as a KEK algorithm.
*/
case ECKeyFormatType:
data = response.getData();
final byte[] keyEnc = new byte[encryptedSessionKey[pLen + 2]];
System.arraycopy(encryptedSessionKey, 2 + pLen + 1, keyEnc, 0, keyEnc.length);
try {
final MessageDigest kdf = MessageDigest.getInstance(MessageDigestUtils.getDigestName(publicKey.getSecurityTokenHashAlgorithm()));
kdf.update(new byte[]{(byte) 0, (byte) 0, (byte) 0, (byte) 1});
kdf.update(data);
kdf.update(publicKey.createUserKeyingMaterial(fingerprintCalculator));
final byte[] kek = kdf.digest();
final Cipher c = Cipher.getInstance("AESWrap");
c.init(Cipher.UNWRAP_MODE, new SecretKeySpec(kek, 0, publicKey.getSecurityTokenSymmetricKeySize() / 8, "AES"));
final Key paddedSessionKey = c.unwrap(keyEnc, "Session", Cipher.SECRET_KEY);
Arrays.fill(kek, (byte) 0);
return PGPPad.unpadSessionData(paddedSessionKey.getEncoded());
} catch (NoSuchAlgorithmException e) {
throw new CardException("Unknown digest/encryption algorithm!");
} catch (NoSuchPaddingException e) {
throw new CardException("Unknown padding algorithm!");
} catch (PGPException e) {
throw new CardException(e.getMessage());
} catch (InvalidKeyException e) {
throw new CardException("Invalid KEK!");
}
default:
throw new CardException("Unknown encryption key type!");
}
}
/**
* Verifies the user's PW1 with the appropriate mode.
*/
private void verifyPinForSignature() throws IOException {
void verifyPinForSignature() throws IOException {
if (mPw1ValidatedForSignature) {
return;
}
if (mPin == null) {
throw new IllegalStateException("Connection not initialized with Pin!");
}
@@ -454,7 +267,10 @@ public class SecurityTokenConnection {
/**
* Verifies the user's PW1 with the appropriate mode.
*/
private void verifyPinForOther() throws IOException {
void verifyPinForOther() throws IOException {
if (mPw1ValidatedForDecrypt) {
return;
}
if (mPin == null) {
throw new IllegalStateException("Connection not initialized with Pin!");
}
@@ -473,7 +289,10 @@ public class SecurityTokenConnection {
/**
* Verifies the user's PW1 or PW3 with the appropriate mode.
*/
private void verifyAdminPin(Passphrase adminPin) throws IOException {
void verifyAdminPin(Passphrase adminPin) throws IOException {
if (mPw3Validated) {
return;
}
// Command APDU for VERIFY command (page 32)
ResponseApdu response =
communicate(commandFactory.createVerifyPw3Command(adminPin.toStringUnsafe().getBytes()));
@@ -484,117 +303,6 @@ public class SecurityTokenConnection {
mPw3Validated = true;
}
/**
* Stores a data object on the token. Automatically validates the proper PIN for the operation.
* Supported for all data objects < 255 bytes in length. Only the cardholder certificate
* (0x7F21) can exceed this length.
*
* @param dataObject The data object to be stored.
* @param data The data to store in the object
*/
private void putData(Passphrase adminPin, int dataObject, byte[] data) throws IOException {
if (data.length > 254) {
throw new IOException("Cannot PUT DATA with length > 254");
}
// TODO use admin pin regardless, if we have it?
if (dataObject == 0x0101 || dataObject == 0x0103) {
if (!mPw1ValidatedForDecrypt) {
verifyPinForOther();
}
} else if (!mPw3Validated) {
verifyAdminPin(adminPin);
}
CommandApdu command = commandFactory.createPutDataCommand(dataObject, data);
ResponseApdu response = communicate(command); // put data
if (!response.isSuccess()) {
throw new CardException("Failed to put data.", response.getSw());
}
}
private void setKeyAttributes(Passphrase adminPin, KeyType keyType, byte[] data) throws IOException {
if (!mOpenPgpCapabilities.isAttributesChangable()) {
return;
}
putData(adminPin, keyType.getAlgoAttributeSlot(), data);
refreshConnectionCapabilities();
}
/**
* Puts a key on the token in the given slot.
*
* @param slot The slot on the token where the key should be stored:
* 0xB6: Signature Key
* 0xB8: Decipherment Key
* 0xA4: Authentication Key
*/
@VisibleForTesting
void putKey(KeyType slot, CanonicalizedSecretKey secretKey, Passphrase passphrase, Passphrase adminPin)
throws IOException {
RSAPrivateCrtKey crtSecretKey;
ECPrivateKey ecSecretKey;
ECPublicKey ecPublicKey;
if (!mPw3Validated) {
verifyAdminPin(adminPin);
}
// Now we're ready to communicate with the token.
byte[] keyBytes;
try {
secretKey.unlock(passphrase);
setKeyAttributes(adminPin, slot, SecurityTokenUtils.attributesFromSecretKey(slot, secretKey,
mOpenPgpCapabilities.getFormatForKeyType(slot)));
KeyFormat formatForKeyType = mOpenPgpCapabilities.getFormatForKeyType(slot);
switch (formatForKeyType.keyFormatType()) {
case RSAKeyFormatType:
if (!secretKey.isRSA()) {
throw new IOException("Security Token not configured for RSA key.");
}
crtSecretKey = secretKey.getSecurityTokenRSASecretKey();
// Should happen only rarely; all GnuPG keys since 2006 use public exponent 65537.
if (!crtSecretKey.getPublicExponent().equals(new BigInteger("65537"))) {
throw new IOException("Invalid public exponent for smart Security Token.");
}
keyBytes = SecurityTokenUtils.createRSAPrivKeyTemplate(crtSecretKey, slot,
(RSAKeyFormat) formatForKeyType);
break;
case ECKeyFormatType:
if (!secretKey.isEC()) {
throw new IOException("Security Token not configured for EC key.");
}
secretKey.unlock(passphrase);
ecSecretKey = secretKey.getSecurityTokenECSecretKey();
ecPublicKey = secretKey.getSecurityTokenECPublicKey();
keyBytes = SecurityTokenUtils.createECPrivKeyTemplate(ecSecretKey, ecPublicKey, slot,
(ECKeyFormat) formatForKeyType);
break;
default:
throw new IOException("Key type unsupported by security token.");
}
} catch (PgpGeneralException e) {
throw new IOException(e.getMessage());
}
CommandApdu apdu = commandFactory.createPutKeyCommand(keyBytes);
ResponseApdu response = communicate(apdu);
if (!response.isSuccess()) {
throw new CardException("Key export to Security Token failed", response.getSw());
}
}
/**
* Return fingerprints of all keys from application specific data stored
* on tag, or null if data not available.
@@ -635,168 +343,6 @@ public class SecurityTokenConnection {
return response.getData();
}
private byte[] prepareDsi(byte[] hash, int hashAlgo) throws IOException {
byte[] dsi;
Log.i(Constants.TAG, "Hash: " + hashAlgo);
switch (hashAlgo) {
case HashAlgorithmTags.SHA1:
if (hash.length != 20) {
throw new IOException("Bad hash length (" + hash.length + ", expected 10!");
}
dsi = Arrays.concatenate(Hex.decode(
"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"), hash); // 0x14 are 20 hash bytes
break;
case HashAlgorithmTags.RIPEMD160:
if (hash.length != 20) {
throw new IOException("Bad hash length (" + hash.length + ", expected 20!");
}
dsi = Arrays.concatenate(Hex.decode("3021300906052B2403020105000414"), hash);
break;
case HashAlgorithmTags.SHA224:
if (hash.length != 28) {
throw new IOException("Bad hash length (" + hash.length + ", expected 28!");
}
dsi = Arrays.concatenate(Hex.decode("302D300D06096086480165030402040500041C"), hash);
break;
case HashAlgorithmTags.SHA256:
if (hash.length != 32) {
throw new IOException("Bad hash length (" + hash.length + ", expected 32!");
}
dsi = Arrays.concatenate(Hex.decode("3031300D060960864801650304020105000420"), hash);
break;
case HashAlgorithmTags.SHA384:
if (hash.length != 48) {
throw new IOException("Bad hash length (" + hash.length + ", expected 48!");
}
dsi = Arrays.concatenate(Hex.decode("3041300D060960864801650304020205000430"), hash);
break;
case HashAlgorithmTags.SHA512:
if (hash.length != 64) {
throw new IOException("Bad hash length (" + hash.length + ", expected 64!");
}
dsi = Arrays.concatenate(Hex.decode("3051300D060960864801650304020305000440"), hash);
break;
default:
throw new IOException("Not supported hash algo!");
}
return dsi;
}
private byte[] prepareData(byte[] hash, int hashAlgo, KeyFormat keyFormat) throws IOException {
byte[] data;
switch (keyFormat.keyFormatType()) {
case RSAKeyFormatType:
data = prepareDsi(hash, hashAlgo);
break;
case ECKeyFormatType:
data = hash;
break;
default:
throw new IOException("Not supported key type!");
}
return data;
}
private byte[] encodeSignature(byte[] signature, KeyFormat keyFormat) throws IOException {
// Make sure the signature we received is actually the expected number of bytes long!
switch (keyFormat.keyFormatType()) {
case RSAKeyFormatType:
// no encoding necessary
int modulusLength = ((RSAKeyFormat) keyFormat).getModulusLength();
if (signature.length != (modulusLength / 8)) {
throw new IOException("Bad signature length! Expected " + (modulusLength / 8) +
" bytes, got " + signature.length);
}
break;
case ECKeyFormatType:
// "plain" encoding, see https://github.com/open-keychain/open-keychain/issues/2108
if (signature.length % 2 != 0) {
throw new IOException("Bad signature length!");
}
final byte[] br = new byte[signature.length / 2];
final byte[] bs = new byte[signature.length / 2];
for (int i = 0; i < br.length; ++i) {
br[i] = signature[i];
bs[i] = signature[br.length + i];
}
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
ASN1OutputStream out = new ASN1OutputStream(baos);
out.writeObject(new DERSequence(new ASN1Encodable[]{new ASN1Integer(br), new ASN1Integer(bs)}));
out.flush();
signature = baos.toByteArray();
break;
}
return signature;
}
/**
* Call COMPUTE DIGITAL SIGNATURE command and returns the MPI value
*
* @param hash the hash for signing
* @return a big integer representing the MPI for the given hash
*/
public byte[] calculateSignature(byte[] hash, int hashAlgo) throws IOException {
if (!mPw1ValidatedForSignature) {
verifyPinForSignature();
}
KeyFormat signKeyFormat = mOpenPgpCapabilities.getFormatForKeyType(KeyType.SIGN);
byte[] data = prepareData(hash, hashAlgo, signKeyFormat);
// Command APDU for PERFORM SECURITY OPERATION: COMPUTE DIGITAL SIGNATURE (page 37)
CommandApdu command = commandFactory.createComputeDigitalSignatureCommand(data);
ResponseApdu response = communicate(command);
if (!response.isSuccess()) {
throw new CardException("Failed to sign", response.getSw());
}
if (!mOpenPgpCapabilities.isPw1ValidForMultipleSignatures()) {
mPw1ValidatedForSignature = false;
}
return encodeSignature(response.getData(), signKeyFormat);
}
/**
* Call INTERNAL AUTHENTICATE command and returns the MPI value
*
* @param hash the hash for signing
* @return a big integer representing the MPI for the given hash
*/
public byte[] calculateAuthenticationSignature(byte[] hash, int hashAlgo) throws IOException {
if (!mPw1ValidatedForDecrypt) {
verifyPinForOther();
}
KeyFormat authKeyFormat = mOpenPgpCapabilities.getFormatForKeyType(KeyType.AUTH);
byte[] data = prepareData(hash, hashAlgo, authKeyFormat);
// Command APDU for INTERNAL AUTHENTICATE (page 55)
CommandApdu command = commandFactory.createInternalAuthCommand(data);
ResponseApdu response = communicate(command);
if (!response.isSuccess()) {
throw new CardException("Failed to sign", response.getSw());
}
if (!mOpenPgpCapabilities.isPw1ValidForMultipleSignatures()) {
mPw1ValidatedForSignature = false;
}
return encodeSignature(response.getData(), authKeyFormat);
}
/**
* Transceives APDU
* Splits extended APDU into short APDUs and chains them if necessary

180
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenPsoSignUseCase.java Normal file
View File

@@ -0,0 +1,180 @@
package org.sufficientlysecure.keychain.securitytoken;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1OutputStream;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.bcpg.HashAlgorithmTags;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Hex;
import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.util.Log;
public class SecurityTokenPsoSignUseCase {
private final SecurityTokenConnection connection;
public static SecurityTokenPsoSignUseCase create(SecurityTokenConnection connection) {
return new SecurityTokenPsoSignUseCase(connection);
}
private SecurityTokenPsoSignUseCase(SecurityTokenConnection connection) {
this.connection = connection;
}
private byte[] prepareDsi(byte[] hash, int hashAlgo) throws IOException {
byte[] dsi;
Log.i(Constants.TAG, "Hash: " + hashAlgo);
switch (hashAlgo) {
case HashAlgorithmTags.SHA1:
if (hash.length != 20) {
throw new IOException("Bad hash length (" + hash.length + ", expected 10!");
}
dsi = Arrays.concatenate(Hex.decode(
"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"), hash); // 0x14 are 20 hash bytes
break;
case HashAlgorithmTags.RIPEMD160:
if (hash.length != 20) {
throw new IOException("Bad hash length (" + hash.length + ", expected 20!");
}
dsi = Arrays.concatenate(Hex.decode("3021300906052B2403020105000414"), hash);
break;
case HashAlgorithmTags.SHA224:
if (hash.length != 28) {
throw new IOException("Bad hash length (" + hash.length + ", expected 28!");
}
dsi = Arrays.concatenate(Hex.decode("302D300D06096086480165030402040500041C"), hash);
break;
case HashAlgorithmTags.SHA256:
if (hash.length != 32) {
throw new IOException("Bad hash length (" + hash.length + ", expected 32!");
}
dsi = Arrays.concatenate(Hex.decode("3031300D060960864801650304020105000420"), hash);
break;
case HashAlgorithmTags.SHA384:
if (hash.length != 48) {
throw new IOException("Bad hash length (" + hash.length + ", expected 48!");
}
dsi = Arrays.concatenate(Hex.decode("3041300D060960864801650304020205000430"), hash);
break;
case HashAlgorithmTags.SHA512:
if (hash.length != 64) {
throw new IOException("Bad hash length (" + hash.length + ", expected 64!");
}
dsi = Arrays.concatenate(Hex.decode("3051300D060960864801650304020305000440"), hash);
break;
default:
throw new IOException("Not supported hash algo!");
}
return dsi;
}
private byte[] prepareData(byte[] hash, int hashAlgo, KeyFormat keyFormat) throws IOException {
byte[] data;
switch (keyFormat.keyFormatType()) {
case RSAKeyFormatType:
data = prepareDsi(hash, hashAlgo);
break;
case ECKeyFormatType:
data = hash;
break;
default:
throw new IOException("Not supported key type!");
}
return data;
}
private byte[] encodeSignature(byte[] signature, KeyFormat keyFormat) throws IOException {
// Make sure the signature we received is actually the expected number of bytes long!
switch (keyFormat.keyFormatType()) {
case RSAKeyFormatType:
// no encoding necessary
int modulusLength = ((RSAKeyFormat) keyFormat).getModulusLength();
if (signature.length != (modulusLength / 8)) {
throw new IOException("Bad signature length! Expected " + (modulusLength / 8) +
" bytes, got " + signature.length);
}
break;
case ECKeyFormatType:
// "plain" encoding, see https://github.com/open-keychain/open-keychain/issues/2108
if (signature.length % 2 != 0) {
throw new IOException("Bad signature length!");
}
final byte[] br = new byte[signature.length / 2];
final byte[] bs = new byte[signature.length / 2];
for (int i = 0; i < br.length; ++i) {
br[i] = signature[i];
bs[i] = signature[br.length + i];
}
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
ASN1OutputStream out = new ASN1OutputStream(baos);
out.writeObject(new DERSequence(new ASN1Encodable[] { new ASN1Integer(br), new ASN1Integer(bs) }));
out.flush();
signature = baos.toByteArray();
break;
}
return signature;
}
/**
* Call COMPUTE DIGITAL SIGNATURE command and returns the MPI value
*
* @param hash the hash for signing
* @return a big integer representing the MPI for the given hash
*/
public byte[] calculateSignature(byte[] hash, int hashAlgo) throws IOException {
connection.verifyPinForSignature();
OpenPgpCapabilities openPgpCapabilities = connection.getOpenPgpCapabilities();
KeyFormat signKeyFormat = openPgpCapabilities.getFormatForKeyType(KeyType.SIGN);
byte[] data = prepareData(hash, hashAlgo, signKeyFormat);
// Command APDU for PERFORM SECURITY OPERATION: COMPUTE DIGITAL SIGNATURE (page 37)
CommandApdu command = connection.getCommandFactory().createComputeDigitalSignatureCommand(data);
ResponseApdu response = connection.communicate(command);
connection.maybeInvalidatePw1();
if (!response.isSuccess()) {
throw new CardException("Failed to sign", response.getSw());
}
return encodeSignature(response.getData(), signKeyFormat);
}
/**
* Call INTERNAL AUTHENTICATE command and returns the MPI value
*
* @param hash the hash for signing
* @return a big integer representing the MPI for the given hash
*/
public byte[] calculateAuthenticationSignature(byte[] hash, int hashAlgo) throws IOException {
connection.verifyPinForOther();
OpenPgpCapabilities openPgpCapabilities = connection.getOpenPgpCapabilities();
KeyFormat authKeyFormat = openPgpCapabilities.getFormatForKeyType(KeyType.AUTH);
byte[] data = prepareData(hash, hashAlgo, authKeyFormat);
// Command APDU for INTERNAL AUTHENTICATE (page 55)
CommandApdu command = connection.getCommandFactory().createInternalAuthCommand(data);
ResponseApdu response = connection.communicate(command);
if (!response.isSuccess()) {
throw new CardException("Failed to sign", response.getSw());
}
return encodeSignature(response.getData(), authKeyFormat);
}
}