FingerprintManagerCompatApi23.java revision d019e1cc3c5cbd5af21cd6bbf4e6d4593a5a6c65 
1/*
2 * Copyright (C) 2015 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
17package android.support.v4.hardware.fingerprint;
18
19import android.content.Context;
20import android.hardware.fingerprint.FingerprintManager;
21
22import java.security.Signature;
23
24import javax.crypto.Cipher;
25
26/**
27 * Actual FingerprintManagerCompat implementation for API level 23 and later.
28 */
29public final class FingerprintManagerCompatApi23 {
30
31    private static FingerprintManager getFingerprintManager(Context ctx) {
32        return ctx.getSystemService(FingerprintManager.class);
33    }
34
35    public static boolean hasEnrolledFingerprints(Context context) {
36        return getFingerprintManager(context).hasEnrolledFingerprints();
37    }
38
39    public static boolean isHardwareDetected(Context context) {
40        return getFingerprintManager(context).isHardwareDetected();
41    }
42
43    public static void authenticate(Context context, CryptoObject crypto, Object cancel,
44            AuthenticationCallback callback, int flags) {
45        getFingerprintManager(context).authenticate(wrapCryptoObject(crypto),
46                (android.os.CancellationSignal) cancel,
47                wrapCallback(callback), flags);
48    }
49
50    private static FingerprintManager.CryptoObject wrapCryptoObject(CryptoObject cryptoObject) {
51        if (cryptoObject.getCipher() != null) {
52            return new FingerprintManager.CryptoObject(cryptoObject.getCipher());
53        } else {
54            return new FingerprintManager.CryptoObject(cryptoObject.getSignature());
55        }
56    }
57
58    private static CryptoObject unwrapCryptoObject(FingerprintManager.CryptoObject cryptoObject) {
59        if (cryptoObject.getCipher() != null) {
60            return new CryptoObject(cryptoObject.getCipher());
61        } else {
62            return new CryptoObject(cryptoObject.getSignature());
63        }
64    }
65
66    private static FingerprintManager.AuthenticationCallback wrapCallback(
67            final AuthenticationCallback callback) {
68        return new FingerprintManager.AuthenticationCallback() {
69            @Override
70            public void onAuthenticationError(int errMsgId, CharSequence errString) {
71                callback.onAuthenticationError(errMsgId, errString);
72            }
73
74            @Override
75            public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) {
76                callback.onAuthenticationHelp(helpMsgId, helpString);
77            }
78
79            @Override
80            public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
81                callback.onAuthenticationSucceeded(new AuthenticationResultInternal(
82                        unwrapCryptoObject(result.getCryptoObject())));
83            }
84
85            @Override
86            public void onAuthenticationFailed() {
87                callback.onAuthenticationFailed();
88            }
89        };
90    }
91
92    public static class CryptoObject {
93
94        private final Signature mSignature;
95        private final Cipher mCipher;
96
97        public CryptoObject(Signature signature) {
98            mSignature = signature;
99            mCipher = null;
100        }
101
102        public CryptoObject(Cipher cipher) {
103            mCipher = cipher;
104            mSignature = null;
105        }
106
107        public Signature getSignature() { return mSignature; }
108        public Cipher getCipher() { return mCipher; }
109    }
110
111    public static final class AuthenticationResultInternal {
112        private CryptoObject mCryptoObject;
113
114        public AuthenticationResultInternal(CryptoObject crypto) {
115            mCryptoObject = crypto;
116        }
117
118        public CryptoObject getCryptoObject() { return mCryptoObject; }
119    }
120
121    public static abstract class AuthenticationCallback {
122
123        public void onAuthenticationError(int errMsgId, CharSequence errString) { }
124        public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) { }
125        public void onAuthenticationSucceeded(AuthenticationResultInternal result) { }
126        public void onAuthenticationFailed() { }
127    }
128}
129