Bo Zhu | 7c1972f | 2018-02-22 21:43:52 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 | package android.security.keystore.recovery; |
| 18 | |
| 19 | import android.annotation.NonNull; |
| 20 | import android.os.Parcel; |
| 21 | import android.os.Parcelable; |
| 22 | |
| 23 | import com.android.internal.util.Preconditions; |
| 24 | |
| 25 | import java.io.ByteArrayInputStream; |
| 26 | import java.security.cert.CertPath; |
| 27 | import java.security.cert.CertificateEncodingException; |
| 28 | import java.security.cert.CertificateException; |
| 29 | import java.security.cert.CertificateFactory; |
| 30 | |
| 31 | /** |
| 32 | * The certificate path of the recovery service. |
| 33 | * |
| 34 | * @hide |
| 35 | */ |
| 36 | public final class RecoveryCertPath implements Parcelable { |
| 37 | |
| 38 | private static final String CERT_PATH_ENCODING = "PkiPath"; |
| 39 | |
| 40 | private final byte[] mEncodedCertPath; |
| 41 | |
| 42 | /** |
| 43 | * Wraps a {@code CertPath} to create a {@code Parcelable} for Binder calls. |
| 44 | * |
| 45 | * @param certPath The certificate path to be wrapped. |
| 46 | * @throws CertificateException if the given certificate path cannot be encoded properly. |
| 47 | */ |
Dmitry Dementyev | fd4ae0b | 2018-03-23 11:06:24 -0700 | [diff] [blame] | 48 | public static @NonNull RecoveryCertPath createRecoveryCertPath(@NonNull CertPath certPath) |
Bo Zhu | 7c1972f | 2018-02-22 21:43:52 -0800 | [diff] [blame] | 49 | throws CertificateException { |
| 50 | // Perform the encoding here to avoid throwing exceptions in writeToParcel |
| 51 | try { |
| 52 | return new RecoveryCertPath(encodeCertPath(certPath)); |
| 53 | } catch (CertificateEncodingException e) { |
| 54 | throw new CertificateException("Failed to encode the given CertPath", e); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Obtains the {@code CertPath} wrapped in the Parcelable. |
| 60 | * |
| 61 | * @return the wrapped certificate path. |
| 62 | * @throws CertificateException if the wrapped certificate path cannot be decoded properly. |
| 63 | */ |
Dmitry Dementyev | fd4ae0b | 2018-03-23 11:06:24 -0700 | [diff] [blame] | 64 | public @NonNull CertPath getCertPath() throws CertificateException { |
Bo Zhu | 7c1972f | 2018-02-22 21:43:52 -0800 | [diff] [blame] | 65 | // Perform the decoding here to avoid throwing exceptions in createFromParcel |
| 66 | return decodeCertPath(mEncodedCertPath); |
| 67 | } |
| 68 | |
| 69 | private RecoveryCertPath(@NonNull byte[] encodedCertPath) { |
| 70 | mEncodedCertPath = Preconditions.checkNotNull(encodedCertPath); |
| 71 | } |
| 72 | |
| 73 | private RecoveryCertPath(Parcel in) { |
| 74 | mEncodedCertPath = in.createByteArray(); |
| 75 | } |
| 76 | |
Dmitry Dementyev | ebe5327 | 2019-03-05 13:33:24 -0800 | [diff] [blame] | 77 | public static final @NonNull Parcelable.Creator<RecoveryCertPath> CREATOR = |
Bo Zhu | 7c1972f | 2018-02-22 21:43:52 -0800 | [diff] [blame] | 78 | new Parcelable.Creator<RecoveryCertPath>() { |
| 79 | public RecoveryCertPath createFromParcel(Parcel in) { |
| 80 | return new RecoveryCertPath(in); |
| 81 | } |
| 82 | |
| 83 | public RecoveryCertPath[] newArray(int length) { |
| 84 | return new RecoveryCertPath[length]; |
| 85 | } |
| 86 | }; |
| 87 | |
| 88 | @Override |
| 89 | public void writeToParcel(Parcel out, int flags) { |
| 90 | out.writeByteArray(mEncodedCertPath); |
| 91 | } |
| 92 | |
| 93 | @Override |
| 94 | public int describeContents() { |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | @NonNull |
| 99 | private static byte[] encodeCertPath(@NonNull CertPath certPath) |
| 100 | throws CertificateEncodingException { |
| 101 | Preconditions.checkNotNull(certPath); |
| 102 | return certPath.getEncoded(CERT_PATH_ENCODING); |
| 103 | } |
| 104 | |
| 105 | @NonNull |
| 106 | private static CertPath decodeCertPath(@NonNull byte[] bytes) throws CertificateException { |
| 107 | Preconditions.checkNotNull(bytes); |
| 108 | CertificateFactory certFactory; |
| 109 | try { |
| 110 | certFactory = CertificateFactory.getInstance("X.509"); |
| 111 | } catch (CertificateException e) { |
| 112 | // Should not happen, as X.509 is mandatory for all providers. |
| 113 | throw new RuntimeException(e); |
| 114 | } |
| 115 | return certFactory.generateCertPath(new ByteArrayInputStream(bytes), CERT_PATH_ENCODING); |
| 116 | } |
| 117 | } |