1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
* Copyright (C) 2016 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.
*/
package org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.crypto;
import static org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util.castNonNull;
import android.net.Uri;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSource;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.DataSpec;
import org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.TransferListener;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.crypto.Cipher;
/**
* A {@link DataSource} that decrypts the data read from an upstream source.
*/
public final class AesCipherDataSource implements DataSource {
private final DataSource upstream;
private final byte[] secretKey;
@Nullable private AesFlushingCipher cipher;
public AesCipherDataSource(byte[] secretKey, DataSource upstream) {
this.upstream = upstream;
this.secretKey = secretKey;
}
@Override
public void addTransferListener(TransferListener transferListener) {
upstream.addTransferListener(transferListener);
}
@Override
public long open(DataSpec dataSpec) throws IOException {
long dataLength = upstream.open(dataSpec);
long nonce = CryptoUtil.getFNV64Hash(dataSpec.key);
cipher = new AesFlushingCipher(Cipher.DECRYPT_MODE, secretKey, nonce,
dataSpec.absoluteStreamPosition);
return dataLength;
}
@Override
public int read(byte[] data, int offset, int readLength) throws IOException {
if (readLength == 0) {
return 0;
}
int read = upstream.read(data, offset, readLength);
if (read == C.RESULT_END_OF_INPUT) {
return C.RESULT_END_OF_INPUT;
}
castNonNull(cipher).updateInPlace(data, offset, read);
return read;
}
@Override
@Nullable
public Uri getUri() {
return upstream.getUri();
}
@Override
public Map<String, List<String>> getResponseHeaders() {
return upstream.getResponseHeaders();
}
@Override
public void close() throws IOException {
cipher = null;
upstream.close();
}
}
|
