smb2_sign_init_hmac_param
smb2_sign_init_hmac_param(&mech, ¶m, SMB2_SIG_SIZE);
smb2_sign_init_hmac_param(&mech, ¶m, keylen);
void smb2_sign_init_hmac_param(smb_crypto_mech_t *, smb_crypto_param_t *,