Nextcloud: Reduced purmations on encryption

OC\Security\SecureRandom::generate Reduced Permutations OC\Security\SecureRandom::generate will by default use a-Z0-9+/ 64 bytes character set. The numbers are not predictable, due to the use of randomint. Most notably the OC\Security\Crypto::encrypt method uses an IV with a length of 16 bytes. I...