tdf#114550 use 32 bit random session key for gpg encryption

Otherwise we'd need to pointlessly spread it to 32 bit down the
road for AES.

Change-Id: I7303be71fd855aa454d07fcae04d7f42e3c9cd9c
Reviewed-on: https://gerrit.libreoffice.org/47781Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

comphelper/source/misc/storagehelper.cxx

@@ -448,8 +448,8 @@ uno::Sequence< beans::NamedValue > OStorageHelper::CreateGpgPackageEncryptionDat
 
     rtlRandomPool aRandomPool = rtl_random_createPool();
 
-    // get 16 random chars out of it
-    uno::Sequence < sal_Int8 > aVector(16);
+    // get 32 random chars out of it
+    uno::Sequence < sal_Int8 > aVector(32);
     rtl_random_getBytes( aRandomPool, aVector.getArray(), aVector.getLength() );
 
     rtl_random_destroyPool(aRandomPool);