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      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 
     17 package android.security.net.config;
     18 
     19 import java.util.Arrays;
     20 
     21 /** @hide */
     22 public final class Pin {
     23     public final String digestAlgorithm;
     24     public final byte[] digest;
     25 
     26     private final int mHashCode;
     27 
     28     public Pin(String digestAlgorithm, byte[] digest) {
     29         this.digestAlgorithm = digestAlgorithm;
     30         this.digest = digest;
     31         mHashCode = Arrays.hashCode(digest) ^ digestAlgorithm.hashCode();
     32     }
     33 
     34     /**
     35      * @hide
     36      */
     37     public static boolean isSupportedDigestAlgorithm(String algorithm) {
     38         // Currently only SHA-256 is supported. SHA-512 if/once Chromium networking stack
     39         // supports it.
     40         return "SHA-256".equalsIgnoreCase(algorithm);
     41     }
     42 
     43     /**
     44      * @hide
     45      */
     46     public static int getDigestLength(String algorithm) {
     47         if ("SHA-256".equalsIgnoreCase(algorithm)) {
     48             return 32;
     49         }
     50         throw new IllegalArgumentException("Unsupported digest algorithm: " + algorithm);
     51     }
     52 
     53     @Override
     54     public int hashCode() {
     55         return mHashCode;
     56     }
     57 
     58     @Override
     59     public boolean equals(Object obj) {
     60         if (this == obj) {
     61             return true;
     62         }
     63         if (!(obj instanceof Pin)) {
     64             return false;
     65         }
     66         Pin other = (Pin) obj;
     67         if (other.hashCode() != mHashCode) {
     68             return false;
     69         }
     70         if (!Arrays.equals(digest, other.digest)) {
     71             return false;
     72         }
     73         if (!digestAlgorithm.equals(other.digestAlgorithm)) {
     74             return false;
     75         }
     76         return true;
     77     }
     78 }
     79