Work around missing GCMParameterSpec (pre-KitKat Android)

[Connect2id OSS]

11-06 16:36:21.570: E/AndroidRuntime(3673): FATAL EXCEPTION: IntentService[SyncDataService]
11-06 16:36:21.570: E/AndroidRuntime(3673): java.lang.NoClassDefFoundError: javax.crypto.spec.GCMParameterSpec
11-06 16:36:21.570: E/AndroidRuntime(3673):     at com.nimbusds.jose.crypto.AESGCM.encrypt(AESGCM.java:88)
11-06 16:36:21.570: E/AndroidRuntime(3673):     at com.nimbusds.jose.crypto.ContentCryptoProvider.encrypt(ContentCryptoProvider.java:169)
11-06 16:36:21.570: E/AndroidRuntime(3673):     at com.nimbusds.jose.crypto.ECDHEncrypter.encrypt(ECDHEncrypter.java:149)
11-06 16:36:21.570: E/AndroidRuntime(3673):     at com.nimbusds.jose.JWEObject.encrypt(JWEObject.java:350)

[Vladimir Dzhuvinov]

Added code to fall back to BC crypto API if GCMParameterSpec is not available (Java 6, pre-KitKat Android)

Commit: ef2bf12

[Vladimir Dzhuvinov]

Released to Maven Central as part of 4.5 release.

Requires BouncyCastle API:

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>1.53</version>
        </dependency>