linux-kernel - Re: [PATCH v4 09/15] ufs: core: add support for generate, import and prepare keys

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Date: Tue, 6 Feb 2024 00:23:27 +0530
From: Om Prakash Singh <quic_omprsing@...cinc.com>
To: Gaurav Kashyap <quic_gaurkash@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <andersson@...nel.org>, <ebiggers@...gle.com>,
        <neil.armstrong@...aro.org>, <srinivas.kandagatla@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <robh+dt@...nel.org>
CC: <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        <kernel@...cinc.com>, <linux-crypto@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <quic_nguyenb@...cinc.com>,
        <bartosz.golaszewski@...aro.org>, <konrad.dybcio@...aro.org>,
        <ulf.hansson@...aro.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <mani@...nel.org>, <davem@...emloft.net>,
        <herbert@...dor.apana.org.au>
Subject: Re: [PATCH v4 09/15] ufs: core: add support for generate, import and
 prepare keys



On 1/28/2024 4:44 AM, Gaurav Kashyap wrote:
> Block crypto allows storage controllers like UFS to
> register ops to generate, prepare and import wrapped
> keys in the kernel.
> 
> Wrapped keys in most cases will have vendor specific
> implementations, which means these ops would need to have
> corresponding UFS variant ops.
> This change adds hooks in UFS core to support these variant
> ops and tie them to the blk crypto ops.
> 
> Signed-off-by: Gaurav Kashyap <quic_gaurkash@...cinc.com>
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
Reviewed-by: Om Prakash Singh <quic_omprsing@...cinc.com>

>   drivers/ufs/core/ufshcd-crypto.c | 41 ++++++++++++++++++++++++++++++++
>   include/ufs/ufshcd.h             | 11 +++++++++
>   2 files changed, 52 insertions(+)
> 
> diff --git a/drivers/ufs/core/ufshcd-crypto.c b/drivers/ufs/core/ufshcd-crypto.c
> index c14800eac1ff..fb935a54acfa 100644
> --- a/drivers/ufs/core/ufshcd-crypto.c
> +++ b/drivers/ufs/core/ufshcd-crypto.c
> @@ -143,10 +143,51 @@ bool ufshcd_crypto_enable(struct ufs_hba *hba)
>   	return true;
>   }
>   
> +static int ufshcd_crypto_generate_key(struct blk_crypto_profile *profile,
> +				      u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> +	struct ufs_hba *hba =
> +		container_of(profile, struct ufs_hba, crypto_profile);
> +
> +	if (hba->vops && hba->vops->generate_key)
> +		return  hba->vops->generate_key(hba, lt_key);
> +
> +	return -EOPNOTSUPP;
> +}
> +
> +static int ufshcd_crypto_prepare_key(struct blk_crypto_profile *profile,
> +				     const u8 *lt_key, size_t lt_key_size,
> +				     u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> +	struct ufs_hba *hba =
> +		container_of(profile, struct ufs_hba, crypto_profile);
> +
> +	if (hba->vops && hba->vops->prepare_key)
> +		return  hba->vops->prepare_key(hba, lt_key, lt_key_size, eph_key);
> +
> +	return -EOPNOTSUPP;
> +}
> +
> +static int ufshcd_crypto_import_key(struct blk_crypto_profile *profile,
> +				    const u8 *imp_key, size_t imp_key_size,
> +				    u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> +	struct ufs_hba *hba =
> +		container_of(profile, struct ufs_hba, crypto_profile);
> +
> +	if (hba->vops && hba->vops->import_key)
> +		return  hba->vops->import_key(hba, imp_key, imp_key_size, lt_key);
> +
> +	return -EOPNOTSUPP;
> +}
> +
>   static const struct blk_crypto_ll_ops ufshcd_crypto_ops = {
>   	.keyslot_program	= ufshcd_crypto_keyslot_program,
>   	.keyslot_evict		= ufshcd_crypto_keyslot_evict,
>   	.derive_sw_secret	= ufshcd_crypto_derive_sw_secret,
> +	.generate_key		= ufshcd_crypto_generate_key,
> +	.prepare_key		= ufshcd_crypto_prepare_key,
> +	.import_key		= ufshcd_crypto_import_key,
>   };
>   
>   static enum blk_crypto_mode_num
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index 8a773434a329..fe66ba37e2ee 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -322,6 +322,9 @@ struct ufs_pwr_mode_info {
>    * @config_scaling_param: called to configure clock scaling parameters
>    * @program_key: program or evict an inline encryption key
>    * @derive_sw_secret: derive sw secret from a wrapped key
> + * @generate_key: generate a storage key and return longterm wrapped key
> + * @prepare_key: unwrap longterm key and return ephemeral wrapped key
> + * @import_key: import sw storage key and return longterm wrapped key
>    * @event_notify: called to notify important events
>    * @reinit_notify: called to notify reinit of UFSHCD during max gear switch
>    * @mcq_config_resource: called to configure MCQ platform resources
> @@ -369,6 +372,14 @@ struct ufs_hba_variant_ops {
>   	int	(*derive_sw_secret)(struct ufs_hba *hba, const u8 wkey[],
>   				    unsigned int wkey_size,
>   				    u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE]);
> +	int	(*generate_key)(struct ufs_hba *hba,
> +				u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
> +	int	(*prepare_key)(struct ufs_hba *hba,
> +			       const u8 *lt_key, size_t lt_key_size,
> +			       u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
> +	int	(*import_key)(struct ufs_hba *hba,
> +			      const u8 *imp_key, size_t imp_key_size,
> +			      u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
>   	void	(*event_notify)(struct ufs_hba *hba,
>   				enum ufs_event_type evt, void *data);
>   	void	(*reinit_notify)(struct ufs_hba *);