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Date: Mon, 17 Jun 2024 10:59:43 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Gaurav Kashyap <quic_gaurkash@...cinc.com>
Cc: 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, linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
kernel@...cinc.com, linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
quic_omprsing@...cinc.com, 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, psodagud@...cinc.com, quic_apurupa@...cinc.com,
sonalg@...cinc.com
Subject: Re: [PATCH v5 06/15] soc: qcom: ice: support for generate, import
and prepare key
On Sun, Jun 16, 2024 at 05:51:01PM GMT, Gaurav Kashyap wrote:
> Wrapped key creation and management using HWKM is currently
> supported only through Qualcomm's Trustzone.
> Three new SCM calls have already been added in the scm layer
> for this purpose.
>
> This patch adds support for generate, prepare and import key
> apis in ICE module and hooks it up the scm calls defined for them.
> This will eventually plug into the new IOCTLS added for this
> usecase in the block layer.
Documentation/process/submitting-patches.rst. "This patch..."
>
> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>
> Signed-off-by: Gaurav Kashyap <quic_gaurkash@...cinc.com>
> ---
> drivers/soc/qcom/ice.c | 75 ++++++++++++++++++++++++++++++++++++++++++
> include/soc/qcom/ice.h | 8 +++++
> 2 files changed, 83 insertions(+)
>
> diff --git a/drivers/soc/qcom/ice.c b/drivers/soc/qcom/ice.c
> index f0e9e0885732..68062b27f40c 100644
> --- a/drivers/soc/qcom/ice.c
> +++ b/drivers/soc/qcom/ice.c
> @@ -21,6 +21,13 @@
>
> #define AES_256_XTS_KEY_SIZE 64
>
> +/*
> + * Wrapped key sizes that HWKM expects and manages is different for different
> + * versions of the hardware.
> + */
> +#define QCOM_ICE_HWKM_WRAPPED_KEY_SIZE(v) \
> + ((v) == 1 ? 68 : 100)
> +
> /* QCOM ICE registers */
> #define QCOM_ICE_REG_VERSION 0x0008
> #define QCOM_ICE_REG_FUSE_SETTING 0x0010
> @@ -445,6 +452,74 @@ int qcom_ice_derive_sw_secret(struct qcom_ice *ice, const u8 wkey[],
> }
> EXPORT_SYMBOL_GPL(qcom_ice_derive_sw_secret);
>
> +/**
> + * qcom_ice_generate_key() - Generate a wrapped key for inline encryption
> + * @lt_key: longterm wrapped key that is generated, which is
> + * BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE in size.
> + *
> + * Make a scm call into trustzone to generate a wrapped key for storage
> + * encryption using hwkm.
> + *
> + * Return: lt wrapped key size on success; err on failure.
This is incorrect.
> + */
> +int qcom_ice_generate_key(struct qcom_ice *ice,
> + u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> + size_t wk_size = QCOM_ICE_HWKM_WRAPPED_KEY_SIZE(ice->hwkm_version);
> +
> + if (!qcom_scm_generate_ice_key(lt_key, wk_size))
> + return wk_size;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_ice_generate_key);
> +
> +/**
> + * qcom_ice_prepare_key() - Prepare a longterm wrapped key for inline encryption
> + * @lt_key: longterm wrapped key that is generated or imported.
> + * @lt_key_size: size of the longterm wrapped_key
> + * @eph_key: wrapped key returned which has been wrapped with a per-boot ephemeral key,
> + * size of which is BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE in size.
> + *
> + * Make a scm call into trustzone to prepare a wrapped key for storage
> + * encryption by rewrapping the longterm wrapped key with a per boot ephemeral
> + * key using hwkm.
> + *
> + * Return: eph wrapped key size on success; err on failure.
And this too.
> + */
> +int qcom_ice_prepare_key(struct qcom_ice *ice, const u8 *lt_key, size_t lt_key_size,
> + u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> + size_t wk_size = QCOM_ICE_HWKM_WRAPPED_KEY_SIZE(ice->hwkm_version);
> +
> + if (!qcom_scm_prepare_ice_key(lt_key, lt_key_size, eph_key, wk_size))
> + return wk_size;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_ice_prepare_key);
> +
> +/**
> + * qcom_ice_import_key() - Import a raw key for inline encryption
> + * @imp_key: raw key that has to be imported
> + * @imp_key_size: size of the imported key
> + * @lt_key: longterm wrapped key that is imported, which is
> + * BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE in size.
> + *
> + * Make a scm call into trustzone to import a raw key for storage encryption
> + * and generate a longterm wrapped key using hwkm.
> + *
> + * Return: lt wrapped key size on success; err on failure.
Guess, this is incorrect too.
> + */
> +int qcom_ice_import_key(struct qcom_ice *ice, const u8 *imp_key, size_t imp_key_size,
> + u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE])
> +{
> + size_t wk_size = QCOM_ICE_HWKM_WRAPPED_KEY_SIZE(ice->hwkm_version);
> +
> + if (!qcom_scm_import_ice_key(imp_key, imp_key_size, lt_key, wk_size))
> + return wk_size;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_ice_import_key);
> +
> static struct qcom_ice *qcom_ice_create(struct device *dev,
> void __iomem *base)
> {
> diff --git a/include/soc/qcom/ice.h b/include/soc/qcom/ice.h
> index dabe0d3a1fd0..dcf277d196ff 100644
> --- a/include/soc/qcom/ice.h
> +++ b/include/soc/qcom/ice.h
> @@ -39,5 +39,13 @@ bool qcom_ice_hwkm_supported(struct qcom_ice *ice);
> int qcom_ice_derive_sw_secret(struct qcom_ice *ice, const u8 wkey[],
> unsigned int wkey_size,
> u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE]);
> +int qcom_ice_generate_key(struct qcom_ice *ice,
> + u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
> +int qcom_ice_prepare_key(struct qcom_ice *ice,
> + const u8 *lt_key, size_t lt_key_size,
> + u8 eph_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
> +int qcom_ice_import_key(struct qcom_ice *ice,
> + const u8 *imp_key, size_t imp_key_size,
> + u8 lt_key[BLK_CRYPTO_MAX_HW_WRAPPED_KEY_SIZE]);
> struct qcom_ice *of_qcom_ice_get(struct device *dev);
> #endif /* __QCOM_ICE_H__ */
> --
> 2.43.0
>
--
With best wishes
Dmitry
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