* cipher/camellia-glue.c (_gcry_camellia_ocb_crypt)
(_gcry_camellia_ocb_auth): Precalculate Ls array always, instead of
just if 'blkn % <parallel blocks> == 0'.
* cipher/serpent.c (_gcry_serpent_ocb_crypt)
(_gcry_serpent_ocb_auth): Ditto.
* cipher/rijndael-aesni.c (get_l): Remove low-bit checks.
(aes_ocb_enc, aes_ocb_dec, _gcry_aes_aesni_ocb_auth): Handle leading
blocks until block counter is multiple of 4, so that parallel block
processing loop can use 'c->u_mode.ocb.L' array directly.
* tests/basic.c (check_ocb_cipher_largebuf): Rename to...
(check_ocb_cipher_largebuf_split): ...this and add option to process
large buffer as two split buffers.
(check_ocb_cipher_largebuf): New.