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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Copyright (c) 2017, The Linux Foundation.
*/
/*
* Copyright 2012 Giesecke & Devrient GmbH.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.se.security.gpac;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
/**
* Hash-REF-DO: The Hash-REF-DO is used for retrieving and storing the corresponding access rules
* for a device application (which is identified by the hash value of its certificate) from and to
* the ARA
*/
public class Hash_REF_DO extends BerTlv {
public static final int TAG = 0xC1;
public static final int SHA1_LEN = 20;
public static final int SHA256_LEN = 32;
private byte[] mHash = new byte[0];
public Hash_REF_DO(byte[] rawData, int valueIndex, int valueLength) {
super(rawData, TAG, valueIndex, valueLength);
}
public Hash_REF_DO(byte[] hash) {
super(hash, TAG, 0, (hash == null ? 0 : hash.length));
if (hash != null) mHash = hash;
}
public Hash_REF_DO() {
super(null, TAG, 0, 0);
}
/**
* Comapares two Hash_REF_DO objects and returns true if they are equal
*/
public static boolean equals(Hash_REF_DO obj1, Hash_REF_DO obj2) {
if (obj1 == null) {
return (obj2 == null) ? true : false;
}
return obj1.equals(obj2);
}
public byte[] getHash() {
return mHash;
}
@Override
public String toString() {
StringBuilder b = new StringBuilder();
ByteArrayOutputStream out = new ByteArrayOutputStream();
b.append("Hash_REF_DO: ");
try {
this.build(out);
b.append(BerTlv.toHex(out.toByteArray()));
} catch (Exception e) {
b.append(e.getLocalizedMessage());
}
return b.toString();
}
/**
* Tags: C1 Length: 0 or SHA1_LEN or SHA256_LEN bytes
*
* <p>Value: Hash: identifies a specific device application Empty: refers to all device
* applications
*
* <p>Length: SHA1_LEN for 20 bytes SHA-1 hash value
* SHA256_LEN for 32 bytes SHA-256 hash value
* 0 for empty value field
*/
@Override
public void interpret() throws ParserException {
mHash = new byte[0];
byte[] data = getRawData();
int index = getValueIndex();
int length = getValueLength();
// sanity checks
if (length != 0 && length != SHA1_LEN && length != SHA256_LEN) {
throw new ParserException("Invalid value length for Hash-REF-DO!");
}
if (length != 0) {
if (index + length > data.length) {
throw new ParserException("Not enough data for Hash-REF-DO!");
}
mHash = new byte[length];
System.arraycopy(data, index, mHash, 0, length);
}
}
/**
* Tags: C1 Length: 0 or 20 bytes
*
* <p>Value: Hash: identifies a specific device application Empty: refers to all device
* applications
*
* <p>Length: 20 for SHA-1 hash or
* 32 bytes for SHA-256 hash or
* 0 for empty value field
*/
@Override
public void build(ByteArrayOutputStream stream) throws DO_Exception {
// sanity checks
if (mHash.length != SHA1_LEN && mHash.length != SHA256_LEN && mHash.length != 0) {
throw new DO_Exception("Hash value must be " + SHA1_LEN + " or " + SHA256_LEN
+ " bytes in length!");
}
stream.write(getTag());
try {
stream.write(mHash.length);
stream.write(mHash);
} catch (IOException ioe) {
throw new DO_Exception("Hash could not be written!");
}
}
@Override
public boolean equals(Object obj) {
if (obj instanceof Hash_REF_DO) {
Hash_REF_DO hash_ref_do = (Hash_REF_DO) obj;
if (getTag() == hash_ref_do.getTag()) {
return Arrays.equals(mHash, hash_ref_do.mHash);
}
}
return false;
}
}
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