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annotate src/ch/ethz/ssh2/crypto/SecureRandomFix.java @ 384:b919cd3d6e2f

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author Carl Byington <carl@five-ten-sg.com>
date Wed, 06 Aug 2014 11:34:32 -0700
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1 //
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2 // Copyright (C) 2014 by 510 Software Group
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3 // licensed under the GPLv3 or later
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4
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5 package ch.ethz.ssh2.crypto;
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6
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7 import android.os.Build;
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8 import android.os.Process;
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9
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10 import java.io.ByteArrayOutputStream;
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11 import java.io.DataOutputStream;
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12 import java.io.IOException;
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13 import java.io.UnsupportedEncodingException;
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14 import java.security.SecureRandom;
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15
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16
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17 public class SecureRandomFix extends SecureRandom {
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18
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19 // http://android-developers.blogspot.com/2013/08/some-securerandom-thoughts.html
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20
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21 private static final int VERSION_CODE_JELLY_BEAN_MR2 = 18;
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22 private static final byte[] BUILD_FINGERPRINT_AND_DEVICE_SERIAL =
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23 getBuildFingerprintAndDeviceSerial();
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24
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25 private static byte[] generateReasonableSeed() {
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26 try {
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27 ByteArrayOutputStream seedBuffer = new ByteArrayOutputStream();
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28 DataOutputStream seedBufferOut =
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29 new DataOutputStream(seedBuffer);
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30 seedBufferOut.writeLong(System.currentTimeMillis());
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31 seedBufferOut.writeLong(System.nanoTime());
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32 seedBufferOut.writeInt(Process.myPid());
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33 seedBufferOut.writeInt(Process.myUid());
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34 seedBufferOut.write(BUILD_FINGERPRINT_AND_DEVICE_SERIAL);
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35 seedBufferOut.close();
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36 return seedBuffer.toByteArray();
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37 } catch (IOException e) {
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38 throw new SecurityException("Failed to generate seed", e);
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39 }
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40 }
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41
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42 /**
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43 * Gets the hardware serial number of this device.
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44 *
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45 * @return serial number or {@code null} if not available.
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46 */
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47 private static String getDeviceSerialNumber() {
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48 // We're using the Reflection API because Build.SERIAL is only available
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49 // since API Level 9 (Gingerbread, Android 2.3).
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50 try {
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51 return (String) Build.class.getField("SERIAL").get(null);
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52 } catch (Exception ignored) {
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53 return null;
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54 }
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55 }
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56
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57 private static byte[] getBuildFingerprintAndDeviceSerial() {
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58 StringBuilder result = new StringBuilder();
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59 String fingerprint = Build.FINGERPRINT;
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60 if (fingerprint != null) {
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61 result.append(fingerprint);
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62 }
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63 String serial = getDeviceSerialNumber();
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64 if (serial != null) {
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65 result.append(serial);
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66 }
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67 try {
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68 return result.toString().getBytes("UTF-8");
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69 } catch (UnsupportedEncodingException e) {
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70 throw new RuntimeException("UTF-8 encoding not supported");
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71 }
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72 }
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73
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74 public SecureRandomFix() {
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75 super();
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76 if (Build.VERSION.SDK_INT > VERSION_CODE_JELLY_BEAN_MR2) {
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77 // No need to apply the fix
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78 return;
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79 }
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80 setSeed(generateReasonableSeed());
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81 }
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82 }