MMC defines a variant op to tie the corresponding
derive software secret blk crypto op to the vendor specific
implementation of wrapped keys. This patch implements
this variant op.
Signed-off-by: Seshu Madhavi Puppala <quic_spuppala@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci-msm.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index f031a4dbc719..aba1d6e688b6 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -1897,6 +1897,21 @@ static int sdhci_msm_program_key(struct cqhci_host *cq_host,
return qcom_ice_evict_key(msm_host->ice, slot);
}
+/*
+ * Derive a software secret from a hardware wrapped key. The key is unwrapped in
+ * hardware from trustzone and a software key/secret is then derived from it.
+ */
+static int sdhci_msm_ice_derive_sw_secret(struct cqhci_host *cq_host, const u8 wkey[],
+ unsigned int wkey_size,
+ u8 sw_secret[BLK_CRYPTO_SW_SECRET_SIZE])
+{
+ struct sdhci_host *host = mmc_priv(cq_host->mmc);
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+
+ return qcom_ice_derive_sw_secret(msm_host->ice, wkey, wkey_size, sw_secret);
+}
+
#else /* CONFIG_MMC_CRYPTO */
static inline int sdhci_msm_ice_init(struct sdhci_msm_host *msm_host,
@@ -2003,6 +2018,7 @@ static const struct cqhci_host_ops sdhci_msm_cqhci_ops = {
.disable = sdhci_msm_cqe_disable,
#ifdef CONFIG_MMC_CRYPTO
.program_key = sdhci_msm_program_key,
+ .derive_sw_secret = sdhci_msm_ice_derive_sw_secret,
#endif
};
--
2.17.1
