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Make registration ID optionally extended.

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This commit is contained in:
Moxie Marlinspike 2014-08-06 11:21:38 -07:00
parent 2db44a1578
commit 7b1a37bd91
1 changed files with 9 additions and 2 deletions
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11
libaxolotl/src/main/java/org/whispersystems/libaxolotl/util/KeyHelper.java
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@ -38,11 +38,18 @@ public class KeyHelper {
* Generate a registration ID. Clients should only do this once,
* at install time.
*
* @param extendedRange By default (false), the generated registration
* ID is sized to require the minimal possible protobuf
* encoding overhead. Specify true if the caller needs
* the full range of MAX_INT at the cost of slightly
* higher encoding overhead.
* @return the generated registration ID.
*/
public static int generateRegistrationId() {
public static int generateRegistrationId(boolean extendedRange) {
try {
return SecureRandom.getInstance("SHA1PRNG").nextInt(16380) + 1;
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
if (extendedRange) return secureRandom.nextInt(Integer.MAX_VALUE - 1) + 1;
else return secureRandom.nextInt(16380) + 1;
} catch (NoSuchAlgorithmException e) {
throw new AssertionError(e);
}