[PATCH 07/12] nvme: Implement In-Band authentication

[Sagi Grimberg]

> +int nvme_auth_generate_key(struct nvme_ctrl *ctrl, u8 *secret, bool set_ctrl)

Maybe instead of set_ctrl introduct struct dhchap_key and pass a pointer
into that?

> +{
> +	u8 *key;
> +	size_t key_len;
> +	u8 key_hash;
> +
> +	if (!secret)
> +		return 0;
> +
> +	if (sscanf(secret, "DHHC-1:%hhd:%*s:", &key_hash) != 1)
> +		return -EINVAL;
> +
> +	/* Pass in the secret without the 'DHHC-1:XX:' prefix */
> +	key = nvme_auth_extract_secret(secret + 10, key_hash,
> +				       &key_len);
> +	if (IS_ERR(key)) {
> +		dev_dbg(ctrl->device, "failed to extract key, error %ld\n",
> +			PTR_ERR(key));
> +		return PTR_ERR(key);
> +	}
> +
> +	if (set_ctrl) {
> +		ctrl->dhchap_ctrl_key = key;
> +		ctrl->dhchap_ctrl_key_len = key_len;
> +		ctrl->dhchap_ctrl_key_hash = key_hash;
> +	} else {
> +		ctrl->dhchap_key = key;
> +		ctrl->dhchap_key_len = key_len;
> +		ctrl->dhchap_key_hash = key_hash;
> +	}

Then it becomes:
	dhchap_key->key = key;
	dhchap_key->len = key_len;
	dhchap_key->hash = key_hash;