1 /*
2 **
3 ** Copyright 2016, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #ifndef KEYSTORE_KEYSTORE_AIDL_HIDL_MARSHALLING_UTILS_H_
19 #define KEYSTORE_KEYSTORE_AIDL_HIDL_MARSHALLING_UTILS_H_
20
21 #include <utility>
22
23 #include <binder/Parcel.h>
24
25 #include <keystore/keymaster_types.h>
26
27 namespace keystore {
28
29 template <typename Fn, typename... Args>
30 inline auto nullable(Fn fn, const android::Parcel& in, Args&&... args)
31 -> NullOr<decltype(fn(in, std::forward<Args>(args)...))> {
32 if (in.readInt32() != 1) {
33 return {};
34 }
35
36 return fn(in, std::forward<Args>(args)...);
37 }
38 template <typename Fn, typename Arg>
nullable(Fn fn,const NullOr<Arg> & arg,android::Parcel * out)39 inline android::status_t nullable(Fn fn, const NullOr<Arg>& arg, android::Parcel* out) {
40 if (!arg.isOk()) {
41 return out->writeInt32(0);
42 }
43 auto rc = out->writeInt32(1);
44 if (rc != ::android::OK) return rc;
45
46 return fn(arg.value(), out);
47 }
48 template <typename Fn, typename Arg>
nullable(Fn fn,Arg && arg,android::Parcel * out)49 inline android::status_t nullable(Fn fn, Arg&& arg, android::Parcel* out) {
50 auto rc = out->writeInt32(1);
51 if (rc != ::android::OK) return rc;
52
53 return fn(std::forward<Arg>(arg), out);
54 }
55
nullable(android::Parcel * out)56 inline android::status_t nullable(android::Parcel* out) {
57 return out->writeInt32(0);
58 }
59
60 /**
61 * makes a copy only if inPlace is false
62 */
63 hidl_vec<uint8_t> readKeymasterBlob(const android::Parcel& in);
64 android::status_t writeKeymasterBlob(const hidl_vec<uint8_t>& blob, android::Parcel* out);
65
66 NullOr<hidl_vec<uint8_t>> readBlobAsByteArray(const android::Parcel& in, bool inPlace = true);
67 android::status_t writeBlobAsByteArray(const NullOr<const hidl_vec<uint8_t>&>& blob,
68 android::Parcel* out);
69
70 NullOr<KeyParameter> readKeyParameterFromParcel(const android::Parcel& in);
71 android::status_t writeKeyParameterToParcel(const KeyParameter& param, android::Parcel* out);
72
73 hidl_vec<KeyParameter> readParamSetFromParcel(const android::Parcel& in);
74 android::status_t writeParamSetToParcel(const hidl_vec<KeyParameter>& params, android::Parcel* out);
75
76 hidl_vec<hidl_vec<uint8_t>> readCertificateChainFromParcel(const android::Parcel& in);
77 }
78
79 #endif // KEYSTORE_KEYSTORE_AIDL_HIDL_MARSHALLING_UTILS_H_
80