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-rw-r--r--src/main/java/de/pixart/messenger/utils/PRNGFixes.java124
1 files changed, 62 insertions, 62 deletions
diff --git a/src/main/java/de/pixart/messenger/utils/PRNGFixes.java b/src/main/java/de/pixart/messenger/utils/PRNGFixes.java
index 211ebca8e..c26fe9f13 100644
--- a/src/main/java/de/pixart/messenger/utils/PRNGFixes.java
+++ b/src/main/java/de/pixart/messenger/utils/PRNGFixes.java
@@ -133,6 +133,58 @@ public final class PRNGFixes {
}
/**
+ * Generates a device- and invocation-specific seed to be mixed into the
+ * Linux PRNG.
+ */
+ private static byte[] generateSeed() {
+ try {
+ ByteArrayOutputStream seedBuffer = new ByteArrayOutputStream();
+ DataOutputStream seedBufferOut = new DataOutputStream(seedBuffer);
+ seedBufferOut.writeLong(System.currentTimeMillis());
+ seedBufferOut.writeLong(System.nanoTime());
+ seedBufferOut.writeInt(Process.myPid());
+ seedBufferOut.writeInt(Process.myUid());
+ seedBufferOut.write(BUILD_FINGERPRINT_AND_DEVICE_SERIAL);
+ seedBufferOut.close();
+ return seedBuffer.toByteArray();
+ } catch (IOException e) {
+ throw new SecurityException("Failed to generate seed", e);
+ }
+ }
+
+ /**
+ * Gets the hardware serial number of this device.
+ *
+ * @return serial number or {@code null} if not available.
+ */
+ private static String getDeviceSerialNumber() {
+ // We're using the Reflection API because Build.SERIAL is only available
+ // since API Level 9 (Gingerbread, Android 2.3).
+ try {
+ return (String) Build.class.getField("SERIAL").get(null);
+ } catch (Exception ignored) {
+ return null;
+ }
+ }
+
+ private static byte[] getBuildFingerprintAndDeviceSerial() {
+ StringBuilder result = new StringBuilder();
+ String fingerprint = Build.FINGERPRINT;
+ if (fingerprint != null) {
+ result.append(fingerprint);
+ }
+ String serial = getDeviceSerialNumber();
+ if (serial != null) {
+ result.append(serial);
+ }
+ try {
+ return result.toString().getBytes("UTF-8");
+ } catch (UnsupportedEncodingException e) {
+ throw new RuntimeException("UTF-8 encoding not supported");
+ }
+ }
+
+ /**
* {@code Provider} of {@code SecureRandom} engines which pass through all
* requests to the Linux PRNG.
*/
@@ -157,17 +209,17 @@ public final class PRNGFixes {
*/
public static class LinuxPRNGSecureRandom extends SecureRandomSpi {
- /*
+ /*
* IMPLEMENTATION NOTE: Requests to generate bytes and to mix in a seed
- * are passed through to the Linux PRNG (/dev/urandom). Instances of
- * this class seed themselves by mixing in the current time, PID, UID,
- * build fingerprint, and hardware serial number (where available) into
- * Linux PRNG.
- *
- * Concurrency: Read requests to the underlying Linux PRNG are
- * serialized (on sLock) to ensure that multiple threads do not get
- * duplicated PRNG output.
- */
+ * are passed through to the Linux PRNG (/dev/urandom). Instances of
+ * this class seed themselves by mixing in the current time, PID, UID,
+ * build fingerprint, and hardware serial number (where available) into
+ * Linux PRNG.
+ *
+ * Concurrency: Read requests to the underlying Linux PRNG are
+ * serialized (on sLock) to ensure that multiple threads do not get
+ * duplicated PRNG output.
+ */
private static final File URANDOM_FILE = new File("/dev/urandom");
@@ -271,56 +323,4 @@ public final class PRNGFixes {
}
}
}
-
- /**
- * Generates a device- and invocation-specific seed to be mixed into the
- * Linux PRNG.
- */
- private static byte[] generateSeed() {
- try {
- ByteArrayOutputStream seedBuffer = new ByteArrayOutputStream();
- DataOutputStream seedBufferOut = new DataOutputStream(seedBuffer);
- seedBufferOut.writeLong(System.currentTimeMillis());
- seedBufferOut.writeLong(System.nanoTime());
- seedBufferOut.writeInt(Process.myPid());
- seedBufferOut.writeInt(Process.myUid());
- seedBufferOut.write(BUILD_FINGERPRINT_AND_DEVICE_SERIAL);
- seedBufferOut.close();
- return seedBuffer.toByteArray();
- } catch (IOException e) {
- throw new SecurityException("Failed to generate seed", e);
- }
- }
-
- /**
- * Gets the hardware serial number of this device.
- *
- * @return serial number or {@code null} if not available.
- */
- private static String getDeviceSerialNumber() {
- // We're using the Reflection API because Build.SERIAL is only available
- // since API Level 9 (Gingerbread, Android 2.3).
- try {
- return (String) Build.class.getField("SERIAL").get(null);
- } catch (Exception ignored) {
- return null;
- }
- }
-
- private static byte[] getBuildFingerprintAndDeviceSerial() {
- StringBuilder result = new StringBuilder();
- String fingerprint = Build.FINGERPRINT;
- if (fingerprint != null) {
- result.append(fingerprint);
- }
- String serial = getDeviceSerialNumber();
- if (serial != null) {
- result.append(serial);
- }
- try {
- return result.toString().getBytes("UTF-8");
- } catch (UnsupportedEncodingException e) {
- throw new RuntimeException("UTF-8 encoding not supported");
- }
- }
} \ No newline at end of file