| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| |
| package org.apache.harmony.security.provider.crypto; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.security.ProviderException; |
| import libcore.io.Streams; |
| |
| /** |
| * Supplies random bits from /dev/urandom. |
| */ |
| public class RandomBitsSupplier implements SHA1_Data { |
| private static FileInputStream devURandom; |
| static { |
| try { |
| devURandom = new FileInputStream(new File("/dev/urandom")); |
| } catch (IOException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| static boolean isServiceAvailable() { |
| return (devURandom != null); |
| } |
| |
| public static byte[] getRandomBits(int byteCount) { |
| if (byteCount <= 0) { |
| throw new IllegalArgumentException("Too few bytes requested: " + byteCount); |
| } |
| try { |
| byte[] result = new byte[byteCount]; |
| Streams.readFully(devURandom, result, 0, byteCount); |
| return result; |
| } catch (Exception ex) { |
| throw new ProviderException("Couldn't read " + byteCount + " random bytes", ex); |
| } |
| } |
| } |