Fix in-place encryption for OCB mode
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Description

Fix in-place encryption for OCB mode

* cipher/cipher-ocb.c (ocb_checksum): New.
(ocb_crypt): Move checksum calculation outside main crypt loop, do
checksum calculation for encryption before inbuf is overwritten.
* tests/basic.c (check_ocb_cipher): Rename to ...
(do_check_ocb_cipher): ... to this and add argument for testing
in-place encryption/decryption.
(check_ocb_cipher): New.