Cleaning up usage of CMAC_xxx

[Hal Murray]

Thanks.

> and a CMAC key using the function EVP_PKEY_new_CMAC_key():

That's the step I was missing.  Right in front of my eyes.

I'm still missing something though.

Does this look reasonable: 
    cipher = EVP_aes_128_cbc();
    pkey = EVP_PKEY_new_CMAC_key(NULL, key, keylength, cipher);
    ctx = EVP_PKEY_CTX_new(pkey, NULL);
    EVP_PKEY_sign_init(ctx);
The last step dies with:
  error:0608D096:digital envelope routines:EVP_PKEY_sign_init:operation not 
supported for this keytype.

[It will probably be obvious after somebody points me in the right direction.]

That cipher work with CMAC.


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