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      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 package org.bouncycastle.crypto.digests;
     18 
     19 import java.security.Security;
     20 import java.util.Locale;
     21 
     22 import org.bouncycastle.crypto.Digest;
     23 
     24 /**
     25  * Level of indirection to let us select OpenSSLDigest implementations
     26  * for libcore but fallback to BouncyCastle ones on the RI.
     27  */
     28 public final class AndroidDigestFactory {
     29     private static final AndroidDigestFactoryInterface CONSCRYPT;
     30     private static final AndroidDigestFactoryInterface BC;
     31 
     32     static {
     33         BC = new AndroidDigestFactoryBouncyCastle();
     34         if (Security.getProvider("AndroidOpenSSL") != null) {
     35             CONSCRYPT = new AndroidDigestFactoryOpenSSL();
     36         } else {
     37             if (System.getProperty("java.vendor", "").toLowerCase(Locale.US).contains("android")) {
     38                 throw new AssertionError("Provider AndroidOpenSSL must exist");
     39             }
     40             CONSCRYPT = null;
     41         }
     42     }
     43 
     44     public static Digest getMD5() {
     45         if (CONSCRYPT != null) {
     46             try {
     47                 return CONSCRYPT.getMD5();
     48             } catch (Exception ignored) {
     49             }
     50         }
     51 
     52         return BC.getMD5();
     53     }
     54 
     55     public static Digest getSHA1() {
     56         if (CONSCRYPT != null) {
     57             try {
     58                 return CONSCRYPT.getSHA1();
     59             } catch (Exception ignored) {
     60             }
     61         }
     62 
     63         return BC.getSHA1();
     64     }
     65 
     66     public static Digest getSHA224() {
     67         if (CONSCRYPT != null) {
     68             try {
     69                 return CONSCRYPT.getSHA224();
     70             } catch (Exception ignored) {
     71             }
     72         }
     73 
     74         return BC.getSHA224();
     75     }
     76 
     77     public static Digest getSHA256() {
     78         if (CONSCRYPT != null) {
     79             try {
     80                 return CONSCRYPT.getSHA256();
     81             } catch (Exception ignored) {
     82             }
     83         }
     84 
     85         return BC.getSHA256();
     86     }
     87 
     88     public static Digest getSHA384() {
     89         if (CONSCRYPT != null) {
     90             try {
     91                 return CONSCRYPT.getSHA384();
     92             } catch (Exception ignored) {
     93             }
     94         }
     95 
     96         return BC.getSHA384();
     97     }
     98 
     99     public static Digest getSHA512() {
    100         if (CONSCRYPT != null) {
    101             try {
    102                 return CONSCRYPT.getSHA512();
    103             } catch (Exception ignored) {
    104             }
    105         }
    106 
    107         return BC.getSHA512();
    108     }
    109 }
    110