Re: [PATCH v11 7/7] ufs: qcom: add support for wrapped keys

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Mon, Feb 03, 2025 at 10:00:41PM -0800, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> Wire up the wrapped key support for ufs-qcom by implementing the needed
> methods in struct blk_crypto_ll_ops and setting the appropriate flag in
> blk_crypto_profile::key_types_supported.
> 
> For more information about this feature and how to use it, refer to
> the sections about hardware-wrapped keys in
> Documentation/block/inline-encryption.rst and
> Documentation/filesystems/fscrypt.rst.
> 
> Based on patches by Gaurav Kashyap <quic_gaurkash@quicinc.com>.
> Reworked to use the custom crypto profile support.
> 

Instead of mentioning the contribution in description, you should use relevant
tags IMO.

> Signed-off-by: Eric Biggers <ebiggers@google.com>

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

- Mani

> ---
>  drivers/ufs/host/ufs-qcom.c | 51 ++++++++++++++++++++++++++++++++-----
>  1 file changed, 45 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index f34527fb02fb2..dc3eb6f29f5b2 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -132,15 +132,10 @@ static int ufs_qcom_ice_init(struct ufs_qcom_host *host)
>  	}
>  
>  	if (IS_ERR_OR_NULL(ice))
>  		return PTR_ERR_OR_ZERO(ice);
>  
> -	if (qcom_ice_get_supported_key_type(ice) != BLK_CRYPTO_KEY_TYPE_RAW) {
> -		dev_warn(dev, "Wrapped keys not supported. Disabling inline encryption support.\n");
> -		return 0;
> -	}
> -
>  	host->ice = ice;
>  
>  	/* Initialize the blk_crypto_profile */
>  
>  	caps.reg_val = cpu_to_le32(ufshcd_readl(hba, REG_UFS_CCAP));
> @@ -150,11 +145,11 @@ static int ufs_qcom_ice_init(struct ufs_qcom_host *host)
>  	if (err)
>  		return err;
>  
>  	profile->ll_ops = ufs_qcom_crypto_ops;
>  	profile->max_dun_bytes_supported = 8;
> -	profile->key_types_supported = BLK_CRYPTO_KEY_TYPE_RAW;
> +	profile->key_types_supported = qcom_ice_get_supported_key_type(ice);
>  	profile->dev = dev;
>  
>  	/*
>  	 * Currently this driver only supports AES-256-XTS.  All known versions
>  	 * of ICE support it, but to be safe make sure it is really declared in
> @@ -218,13 +213,57 @@ static int ufs_qcom_ice_keyslot_evict(struct blk_crypto_profile *profile,
>  	err = qcom_ice_evict_key(host->ice, slot);
>  	ufshcd_release(hba);
>  	return err;
>  }
>  
> +static int ufs_qcom_ice_derive_sw_secret(struct blk_crypto_profile *profile,
> +					 const u8 *eph_key, size_t eph_key_size,
> +					 u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE])
> +{
> +	struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile);
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +
> +	return qcom_ice_derive_sw_secret(host->ice, eph_key, eph_key_size,
> +					 sw_secret);
> +}
> +
> +static int ufs_qcom_ice_import_key(struct blk_crypto_profile *profile,
> +				   const u8 *raw_key, size_t raw_key_size,
> +				   u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> +	struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile);
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +
> +	return qcom_ice_import_key(host->ice, raw_key, raw_key_size, lt_key);
> +}
> +
> +static int ufs_qcom_ice_generate_key(struct blk_crypto_profile *profile,
> +				     u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> +	struct ufs_hba *hba = ufs_hba_from_crypto_profile(profile);
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +
> +	return qcom_ice_generate_key(host->ice, lt_key);
> +}
> +
> +static int ufs_qcom_ice_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 = ufs_hba_from_crypto_profile(profile);
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +
> +	return qcom_ice_prepare_key(host->ice, lt_key, lt_key_size, eph_key);
> +}
> +
>  static const struct blk_crypto_ll_ops ufs_qcom_crypto_ops = {
>  	.keyslot_program	= ufs_qcom_ice_keyslot_program,
>  	.keyslot_evict		= ufs_qcom_ice_keyslot_evict,
> +	.derive_sw_secret	= ufs_qcom_ice_derive_sw_secret,
> +	.import_key		= ufs_qcom_ice_import_key,
> +	.generate_key		= ufs_qcom_ice_generate_key,
> +	.prepare_key		= ufs_qcom_ice_prepare_key,
>  };
>  
>  #else
>  
>  static inline void ufs_qcom_ice_enable(struct ufs_qcom_host *host)
> -- 
> 2.48.1
> 

-- 
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