1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 /* 17 * Copyright (c) 2015-2017, The Linux Foundation. 18 */ 19 20 /* 21 * Copyright (C) 2011 Deutsche Telekom, A.G. 22 * 23 * Licensed under the Apache License, Version 2.0 (the "License"); 24 * you may not use this file except in compliance with the License. 25 * You may obtain a copy of the License at 26 * 27 * http://www.apache.org/licenses/LICENSE-2.0 28 * 29 * Unless required by applicable law or agreed to in writing, software 30 * distributed under the License is distributed on an "AS IS" BASIS, 31 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 32 * See the License for the specific language governing permissions and 33 * limitations under the License. 34 */ 35 36 package com.android.se.security.arf.pkcs15; 37 38 import android.util.Log; 39 40 import com.android.se.security.arf.ASN1; 41 import com.android.se.security.arf.DERParser; 42 import com.android.se.security.arf.SecureElement; 43 import com.android.se.security.arf.SecureElementException; 44 45 import java.io.IOException; 46 import java.util.Arrays; 47 48 /** EF_DIR related features */ 49 public class EFDIR extends EF { 50 51 public static final String TAG = "ACE ARF EF_Dir"; 52 // Standardized ID for EF_DIR file 53 public static final byte[] EFDIR_PATH = {0x3F, 0x00, 0x2F, 0x00}; 54 55 /** 56 * Constructor 57 * 58 * @param secureElement SE on which ISO7816 commands are applied 59 */ 60 public EFDIR(SecureElement handle) { 61 super(handle); 62 } 63 64 /** 65 * Decodes EF_DIR file 66 * 67 * @param buffer ASN.1 data 68 * @param aid Record key to search for 69 * @return Path to "EF_ODF" when an expected record is found; <code>null</code> otherwise 70 */ 71 private byte[] decodeDER(byte[] buffer, byte[] aid) throws PKCS15Exception { 72 DERParser der = new DERParser(buffer); 73 der.parseTLV(ASN1.TAG_ApplTemplate); 74 // Application Identifier 75 der.parseTLV(ASN1.TAG_ApplIdentifier); 76 if (!Arrays.equals(der.getTLVData(), aid)) return null; // Record for another AID 77 78 // Application Label or Application Path 79 byte objectType = der.parseTLV(); 80 if (objectType == ASN1.TAG_ApplLabel) { 81 // Application Label [Optional] 82 der.getTLVData(); 83 der.parseTLV(ASN1.TAG_ApplPath); 84 } else if (objectType != ASN1.TAG_ApplPath) { 85 throw new PKCS15Exception("[Parser] Application Tag expected"); 86 } 87 // Application Path 88 return der.getTLVData(); 89 } 90 91 /** 92 * Analyses DIR file and lookups for AID record 93 * 94 * @param aid Record key to search for 95 * @return Path to "EF_ODF" when an expected record is found; <code>null</code> otherwise 96 */ 97 public byte[] lookupAID(byte[] aid) throws IOException, PKCS15Exception, 98 SecureElementException { 99 Log.i(TAG, "Analysing EF_DIR..."); 100 101 if (selectFile(EFDIR_PATH) != APDU_SUCCESS) throw new PKCS15Exception("EF_DIR not found!!"); 102 103 byte[] data, ODFPath = null; 104 short index = 1; 105 while (index <= getFileNbRecords()) { 106 data = readRecord(index++); 107 if ((ODFPath = decodeDER(data, aid)) != null) break; 108 } 109 return ODFPath; 110 } 111 } 112
