ICrypto.cpp revision 2514d080c8a54ff603a45d7e336de668fe7329db 
1/*
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//#define LOG_NDEBUG 0
18#define LOG_TAG "ICrypto"
19#include <utils/Log.h>
20
21#include <binder/Parcel.h>
22#include <media/ICrypto.h>
23#include <media/stagefright/MediaErrors.h>
24#include <media/stagefright/foundation/ADebug.h>
25#include <media/stagefright/foundation/AString.h>
26
27namespace android {
28
29enum {
30    INIT_CHECK = IBinder::FIRST_CALL_TRANSACTION,
31    IS_CRYPTO_SUPPORTED,
32    CREATE_PLUGIN,
33    DESTROY_PLUGIN,
34    REQUIRES_SECURE_COMPONENT,
35    DECRYPT,
36    NOTIFY_RESOLUTION,
37};
38
39struct BpCrypto : public BpInterface<ICrypto> {
40    BpCrypto(const sp<IBinder> &impl)
41        : BpInterface<ICrypto>(impl) {
42    }
43
44    virtual status_t initCheck() const {
45        Parcel data, reply;
46        data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
47        remote()->transact(INIT_CHECK, data, &reply);
48
49        return reply.readInt32();
50    }
51
52    virtual bool isCryptoSchemeSupported(const uint8_t uuid[16]) {
53        Parcel data, reply;
54        data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
55        data.write(uuid, 16);
56        remote()->transact(IS_CRYPTO_SUPPORTED, data, &reply);
57
58        return reply.readInt32() != 0;
59    }
60
61    virtual status_t createPlugin(
62            const uint8_t uuid[16], const void *opaqueData, size_t opaqueSize) {
63        Parcel data, reply;
64        data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
65        data.write(uuid, 16);
66        data.writeInt32(opaqueSize);
67
68        if (opaqueSize > 0) {
69            data.write(opaqueData, opaqueSize);
70        }
71
72        remote()->transact(CREATE_PLUGIN, data, &reply);
73
74        return reply.readInt32();
75    }
76
77    virtual status_t destroyPlugin() {
78        Parcel data, reply;
79        data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
80        remote()->transact(DESTROY_PLUGIN, data, &reply);
81
82        return reply.readInt32();
83    }
84
85    virtual bool requiresSecureDecoderComponent(
86            const char *mime) const {
87        Parcel data, reply;
88        data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
89        data.writeCString(mime);
90        remote()->transact(REQUIRES_SECURE_COMPONENT, data, &reply);
91
92        return reply.readInt32() != 0;
93    }
94
95    virtual ssize_t decrypt(
96            bool secure,
97            const uint8_t key[16],
98            const uint8_t iv[16],
99            CryptoPlugin::Mode mode,
100            const void *srcPtr,
101            const CryptoPlugin::SubSample *subSamples, size_t numSubSamples,
102            void *dstPtr,
103            AString *errorDetailMsg) {
104        Parcel data, reply;
105        data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
106        data.writeInt32(secure);
107        data.writeInt32(mode);
108
109        static const uint8_t kDummy[16] = { 0 };
110
111        if (key == NULL) {
112            key = kDummy;
113        }
114
115        if (iv == NULL) {
116            iv = kDummy;
117        }
118
119        data.write(key, 16);
120        data.write(iv, 16);
121
122        size_t totalSize = 0;
123        for (size_t i = 0; i < numSubSamples; ++i) {
124            totalSize += subSamples[i].mNumBytesOfEncryptedData;
125            totalSize += subSamples[i].mNumBytesOfClearData;
126        }
127
128        data.writeInt32(totalSize);
129        data.write(srcPtr, totalSize);
130
131        data.writeInt32(numSubSamples);
132        data.write(subSamples, sizeof(CryptoPlugin::SubSample) * numSubSamples);
133
134        if (secure) {
135            data.writeInt64(static_cast<uint64_t>(reinterpret_cast<uintptr_t>(dstPtr)));
136        }
137
138        remote()->transact(DECRYPT, data, &reply);
139
140        ssize_t result = reply.readInt32();
141
142        if (result >= ERROR_DRM_VENDOR_MIN && result <= ERROR_DRM_VENDOR_MAX) {
143            errorDetailMsg->setTo(reply.readCString());
144        }
145
146        if (!secure && result >= 0) {
147            reply.read(dstPtr, result);
148        }
149
150        return result;
151    }
152
153    virtual void notifyResolution(
154        uint32_t width, uint32_t height) {
155        Parcel data, reply;
156        data.writeInterfaceToken(ICrypto::getInterfaceDescriptor());
157        data.writeInt32(width);
158        data.writeInt32(height);
159        remote()->transact(NOTIFY_RESOLUTION, data, &reply);
160    }
161
162private:
163    DISALLOW_EVIL_CONSTRUCTORS(BpCrypto);
164};
165
166IMPLEMENT_META_INTERFACE(Crypto, "android.hardware.ICrypto");
167
168////////////////////////////////////////////////////////////////////////////////
169
170status_t BnCrypto::onTransact(
171    uint32_t code, const Parcel &data, Parcel *reply, uint32_t flags) {
172    switch (code) {
173        case INIT_CHECK:
174        {
175            CHECK_INTERFACE(ICrypto, data, reply);
176            reply->writeInt32(initCheck());
177
178            return OK;
179        }
180
181        case IS_CRYPTO_SUPPORTED:
182        {
183            CHECK_INTERFACE(ICrypto, data, reply);
184            uint8_t uuid[16];
185            data.read(uuid, sizeof(uuid));
186            reply->writeInt32(isCryptoSchemeSupported(uuid));
187
188            return OK;
189        }
190
191        case CREATE_PLUGIN:
192        {
193            CHECK_INTERFACE(ICrypto, data, reply);
194
195            uint8_t uuid[16];
196            data.read(uuid, sizeof(uuid));
197
198            size_t opaqueSize = data.readInt32();
199            void *opaqueData = NULL;
200
201            if (opaqueSize > 0) {
202                opaqueData = malloc(opaqueSize);
203                data.read(opaqueData, opaqueSize);
204            }
205
206            reply->writeInt32(createPlugin(uuid, opaqueData, opaqueSize));
207
208            if (opaqueData != NULL) {
209                free(opaqueData);
210                opaqueData = NULL;
211            }
212
213            return OK;
214        }
215
216        case DESTROY_PLUGIN:
217        {
218            CHECK_INTERFACE(ICrypto, data, reply);
219            reply->writeInt32(destroyPlugin());
220
221            return OK;
222        }
223
224        case REQUIRES_SECURE_COMPONENT:
225        {
226            CHECK_INTERFACE(ICrypto, data, reply);
227
228            const char *mime = data.readCString();
229            reply->writeInt32(requiresSecureDecoderComponent(mime));
230
231            return OK;
232        }
233
234        case DECRYPT:
235        {
236            CHECK_INTERFACE(ICrypto, data, reply);
237
238            bool secure = data.readInt32() != 0;
239            CryptoPlugin::Mode mode = (CryptoPlugin::Mode)data.readInt32();
240
241            uint8_t key[16];
242            data.read(key, sizeof(key));
243
244            uint8_t iv[16];
245            data.read(iv, sizeof(iv));
246
247            size_t totalSize = data.readInt32();
248            void *srcData = malloc(totalSize);
249            data.read(srcData, totalSize);
250
251            int32_t numSubSamples = data.readInt32();
252
253            CryptoPlugin::SubSample *subSamples =
254                new CryptoPlugin::SubSample[numSubSamples];
255
256            data.read(
257                    subSamples,
258                    sizeof(CryptoPlugin::SubSample) * numSubSamples);
259
260            void *dstPtr;
261            if (secure) {
262                dstPtr = reinterpret_cast<void *>(static_cast<uintptr_t>(data.readInt64()));
263            } else {
264                dstPtr = malloc(totalSize);
265            }
266
267            AString errorDetailMsg;
268            ssize_t result = decrypt(
269                    secure,
270                    key,
271                    iv,
272                    mode,
273                    srcData,
274                    subSamples, numSubSamples,
275                    dstPtr,
276                    &errorDetailMsg);
277
278            reply->writeInt32(result);
279
280            if (result >= ERROR_DRM_VENDOR_MIN
281                && result <= ERROR_DRM_VENDOR_MAX) {
282                reply->writeCString(errorDetailMsg.c_str());
283            }
284
285            if (!secure) {
286                if (result >= 0) {
287                    CHECK_LE(result, static_cast<ssize_t>(totalSize));
288                    reply->write(dstPtr, result);
289                }
290                free(dstPtr);
291                dstPtr = NULL;
292            }
293
294            delete[] subSamples;
295            subSamples = NULL;
296
297            free(srcData);
298            srcData = NULL;
299
300            return OK;
301        }
302
303        case NOTIFY_RESOLUTION:
304        {
305            CHECK_INTERFACE(ICrypto, data, reply);
306
307            int32_t width = data.readInt32();
308            int32_t height = data.readInt32();
309            notifyResolution(width, height);
310
311            return OK;
312        }
313
314        default:
315            return BBinder::onTransact(code, data, reply, flags);
316    }
317}
318
319}  // namespace android
320