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Andreas Hubercf0db312012-04-03 14:15:05 -07001/*
2 * Copyright (C) 2012 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#include <utils/Errors.h>
18
19#ifndef CRYPTO_API_H_
20
21#define CRYPTO_API_H_
22
23namespace android {
24
25struct CryptoPlugin;
26
27struct CryptoFactory {
28 CryptoFactory() {}
29 virtual ~CryptoFactory() {}
30
31 virtual bool isCryptoSchemeSupported(const uint8_t uuid[16]) const = 0;
32
33 virtual status_t createPlugin(
34 const uint8_t uuid[16], const void *data, size_t size,
35 CryptoPlugin **plugin) = 0;
36
37private:
38 CryptoFactory(const CryptoFactory &);
39 CryptoFactory &operator=(const CryptoFactory &);
40};
41
42struct CryptoPlugin {
43 enum Mode {
44 kMode_Unencrypted = 0,
45 kMode_AES_CTR = 1,
46
47 // Neither key nor iv are being used in this mode.
48 // Each subsample is encrypted w/ an iv of all zeroes.
49 kMode_AES_WV = 2, // FIX constant
50 };
51
52 struct SubSample {
53 size_t mNumBytesOfClearData;
54 size_t mNumBytesOfEncryptedData;
55 };
56
57 CryptoPlugin() {}
58 virtual ~CryptoPlugin() {}
59
60 // If this method returns false, a non-secure decoder will be used to
61 // decode the data after decryption. The decrypt API below will have
62 // to support insecure decryption of the data (secure = false) for
63 // media data of the given mime type.
64 virtual bool requiresSecureDecoderComponent(const char *mime) const = 0;
65
66 virtual status_t decrypt(
67 bool secure,
68 const uint8_t key[16],
69 const uint8_t iv[16],
70 Mode mode,
71 const void *srcPtr,
72 const SubSample *subSamples, size_t numSubSamples,
73 void *dstPtr) = 0;
74
75private:
76 CryptoPlugin(const CryptoPlugin &);
77 CryptoPlugin &operator=(const CryptoPlugin &);
78};
79
80} // namespace android
81
82extern "C" {
83 extern android::CryptoFactory *createCryptoFactory();
84}
85
86#endif // CRYPTO_API_H_