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
27 namespace android {
28
29 enum {
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
39 struct BpCrypto : public BpInterface<ICrypto> {
BpCryptoandroid::BpCrypto40 BpCrypto(const sp<IBinder> &impl)
41 : BpInterface<ICrypto>(impl) {
42 }
43
initCheckandroid::BpCrypto44 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
isCryptoSchemeSupportedandroid::BpCrypto52 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
createPluginandroid::BpCrypto61 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
destroyPluginandroid::BpCrypto77 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
requiresSecureDecoderComponentandroid::BpCrypto85 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
decryptandroid::BpCrypto95 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
notifyResolutionandroid::BpCrypto153 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
162 private:
163 DISALLOW_EVIL_CONSTRUCTORS(BpCrypto);
164 };
165
166 IMPLEMENT_META_INTERFACE(Crypto, "android.hardware.ICrypto");
167
168 ////////////////////////////////////////////////////////////////////////////////
169
onTransact(uint32_t code,const Parcel & data,Parcel * reply,uint32_t flags)170 status_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