This makes the system select the "best" available provider.
Also the 'BC' provider in newer Android version does not longer
implement certain Ciphers, which causes an NoSuchAlgorithmException if
the Cipher is requested explicitly by the 'BC' provider:
E/XmppService: XmppServiceConnection - Error while sending pending messages
org.jivesoftware.smackx.omemo.exceptions.CryptoFailedException: java.security.NoSuchAlgorithmException: The BC provider no longer provides an implementation for Cipher.AES/GCM/NoPadding. Please see https://android-developers.googleblog.com/2018/03/cryptography-changes-in-android-p.html for more details.
at org.jivesoftware.smackx.omemo.OmemoService.encrypt(OmemoService.java:375)
at org.jivesoftware.smackx.omemo.OmemoService.createOmemoMessage(OmemoService.java:537)
at org.jivesoftware.smackx.omemo.OmemoManager.encrypt(OmemoManager.java:341)
at org.jivesoftware.smackx.omemo.OmemoManager.encrypt(OmemoManager.java:314)
at es.iecisa.xmppservice.XmppServiceConnection.lambda$sendMessage$0(XmppServiceConnection.java:516)
at es.iecisa.xmppservice.-$$Lambda$XmppServiceConnection$aBU_80chagvypMTSd-aSm7pRQRY.run(Unknown Source:4)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.security.NoSuchAlgorithmException: The BC provider no longer provides an implementation for Cipher.AES/GCM/NoPadding. Please see https://android-developers.googleblog.com/2018/03/cryptography-changes-in-android-p.html for more details.
at sun.security.jca.Providers.checkBouncyCastleDeprecation(Providers.java:563)
at sun.security.jca.Providers.checkBouncyCastleDeprecation(Providers.java:346)
at javax.crypto.Cipher.createCipher(Cipher.java:722)
at javax.crypto.Cipher.getInstance(Cipher.java:717)
at javax.crypto.Cipher.getInstance(Cipher.java:674)
at org.jivesoftware.smackx.omemo.util.OmemoMessageBuilder.setMessage(OmemoMessageBuilder.java:169)
at org.jivesoftware.smackx.omemo.util.OmemoMessageBuilder.<init>(OmemoMessageBuilder.java:116)
at org.jivesoftware.smackx.omemo.OmemoService.encrypt(OmemoService.java:372)
at org.jivesoftware.smackx.omemo.OmemoService.createOmemoMessage(OmemoService.java:537)
at org.jivesoftware.smackx.omemo.OmemoManager.encrypt(OmemoManager.java:341)
at org.jivesoftware.smackx.omemo.OmemoManager.encrypt(OmemoManager.java:314)
at es.iecisa.xmppservice.XmppServiceConnection.lambda$sendMessage$0(XmppServiceConnection.java:516)
at es.iecisa.xmppservice.-$$Lambda$XmppServiceConnection$aBU_80chagvypMTSd-aSm7pRQRY.run(Unknown Source:4)
at java.lang.Thread.run(Thread.java:764)
The NPE is caused by an inbound presence stanza without the 'from'
attribute set. The stacktrace of the NPE is:
FATAL EXCEPTION: Smack Cached Executor
Process: de.fhg.ivi.senetz.mobile.android.mbk.debug, PID: 13365
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:944)
at org.jivesoftware.smack.roster.Roster.getPresencesInternal(Roster.java:374)
at org.jivesoftware.smack.roster.Roster.getOrCreatePresencesInternal(Roster.java:388)
at org.jivesoftware.smack.roster.Roster.access$1100(Roster.java:94)
at org.jivesoftware.smack.roster.Roster$PresencePacketListener$1.run(Roster.java:1519)
at org.jivesoftware.smack.AsyncButOrdered$Handler.run(AsyncButOrdered.java:121)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
Thanks to Marcel Heckel for reporting this.
Fixes SMACK-861.
In case an exception happens in connect()/login() the
'disconnectedButResumable' boolean may (still) be set. Which causes
only one of the reader and writer threads to exit, typically the
reader thread, because shutdown() will bail out very early. This
leaves a dangling (writer) thread causing memory leaks and deadlocks
on a subsequent connect()/login().
in case length is zero. Also do throw a NegativeArraySizeException if
length is negative instead of returning null.
This fixes the following sporadic test issue:
org.jivesoftware.smackx.ox.PainlessOpenPgpProviderTest > encryptDecryptTest FAILED
java.lang.AssertionError
at org.jivesoftware.smack.util.XmlStringBuilder.escape(XmlStringBuilder.java:425)
at org.jivesoftware.smackx.ox.element.EncryptedOpenPgpContentElement.addCommonXml(EncryptedOpenPgpContentElement.java:65)
at org.jivesoftware.smackx.ox.element.CryptElement.toXML(CryptElement.java:51)
at org.jivesoftware.smackx.ox.element.CryptElement.toXML(CryptElement.java:31)
at org.jivesoftware.smack.packet.Element.toXML(Element.java:41)
at org.jivesoftware.smackx.ox.element.OpenPgpContentElement.toInputStream(OpenPgpContentElement.java:186)
at org.jivesoftware.smackx.ox.crypto.PainlessOpenPgpProvider.encrypt(PainlessOpenPgpProvider.java:136)
at org.jivesoftware.smackx.ox.PainlessOpenPgpProviderTest.encryptDecryptTest(PainlessOpenPgpProviderTest.java:155)
because EncryptedOpenPgpContentElement rpad field was sometimes
'null' in case the random function returned '0' as length.
