fix: Avoid NPE when some extensions were missing

Author: BenBE

TLS/src/main/java/de/rub/nds/tlsattacker/tls/protocol/extension/ECPointFormatExtensionHandler.java

@@ -47,7 +47,7 @@ public void initializeClientHelloExtension(ECPointFormatExtensionMessage extensi
 
 	extension.setExtensionType(ExtensionType.EC_POINT_FORMATS.getValue());
 	extension.setPointFormats(pointFormats);
-	extension.setPointFormatsLength(pointFormats.length);
+	extension.setPointFormatsLength(pointFormats != null ? pointFormats.length : 0);
 	extension.setExtensionLength(extension.getPointFormatsLength().getValue() + EC_POINT_FORMATS_LENGTH);
 
 	byte[] pfExtension = ArrayConverter.concatenate(extension.getExtensionType().getValue(),

TLS/src/main/java/de/rub/nds/tlsattacker/tls/protocol/extension/EllipticCurvesExtensionHandler.java

@@ -48,7 +48,7 @@ public void initializeClientHelloExtension(EllipticCurvesExtensionMessage extens
 
 	extension.setExtensionType(ExtensionType.ELLIPTIC_CURVES.getValue());
 	extension.setSupportedCurves(curves);
-	extension.setSupportedCurvesLength(curves.length);
+	extension.setSupportedCurvesLength(curves != null ? curves.length : 0);
 	extension.setExtensionLength(extension.getSupportedCurvesLength().getValue() + ExtensionByteLength.EXTENSIONS);
 
 	byte[] ecExtensionBytes = ArrayConverter.concatenate(extension.getExtensionType().getValue(), ArrayConverter

TLS/src/main/java/de/rub/nds/tlsattacker/tls/protocol/extension/SignatureAndHashAlgorithmsExtensionHandler.java

@@ -46,7 +46,7 @@ public void initializeClientHelloExtension(SignatureAndHashAlgorithmsExtensionMe
 
 	extension.setExtensionType(ExtensionType.SIGNATURE_AND_HASH_ALGORITHMS.getValue());
 	extension.setSignatureAndHashAlgorithms(algorithms);
-	extension.setSignatureAndHashAlgorithmsLength(algorithms.length);
+	extension.setSignatureAndHashAlgorithmsLength(algorithms != null ? algorithms.length : 0);
 	extension.setExtensionLength(extension.getSignatureAndHashAlgorithmsLength().getValue()
 		+ ExtensionByteLength.EXTENSIONS);