cipher/bulkhelp: add functions for CTR/CBC/CFB/OCB bulk processing
* cipher/bulkhelp.h (bulk_crypt_fn_t, bulk_ctr_enc_128) (bulk_cbc_dec_128, bulk_cfb_dec_128, bulk_ocb_crypt_128) (bulk_ocb_auth_128): New. * cipher/sm4.c (_gcry_sm4_ctr_enc, _gcry_sm4_cbc_dec) (_gcry_sm4_cfb_dec, _gcry_sm4_ocb_crypt, _gcry_sm4_ocb_auth): Switch to use helper functions from 'bulkhelp.h'.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>