* cipher/Makefile.am: Add 'cipher-cmac.c' and 'mac-cmac.c'.
* cipher/cipher-cmac.c: New.
* cipher/cipher-internal.h (gcry_cipher_handle.u_mode): Add 'cmac'.
* cipher/cipher.c (gcry_cipher_open): Rename to...
(_gcry_cipher_open_internal): ...this and add CMAC.
(gcry_cipher_open): New wrapper that disallows use of internal
modes (CMAC) from outside.
(cipher_setkey, cipher_encrypt, cipher_decrypt)
(_gcry_cipher_authenticate, _gcry_cipher_gettag)
(_gcry_cipher_checktag): Add handling for CMAC mode.
(cipher_reset): Do not reset 'marks.key' and do not clear subkeys in
'u_mode' in CMAC mode.
* cipher/mac-cmac.c: New.
* cipher/mac-internal.h: Add CMAC support and algorithms.
* cipher/mac.c: Add CMAC algorithms.
* doc/gcrypt.texi: Add documentation for CMAC.
* src/cipher.h (gcry_cipher_internal_modes): New.
(_gcry_cipher_open_internal, _gcry_cipher_cmac_authenticate)
(_gcry_cipher_cmac_get_tag, _gcry_cipher_cmac_check_tag)
(_gcry_cipher_cmac_set_subkeys): New prototypes.
* src/gcrypt.h.in (gcry_mac_algos): Add CMAC algorithms.
* tests/basic.c (check_mac): Add CMAC test vectors.