[PATCH 13/43] misc/mei/hdcp: Verify H_prime

Ramalingam C
2018-02-14T14:20:19Z

Requests for the verifcation of AKE_Send_H_prime.

ME will calculation the H and comparing it with received H_Prime.
Here AKE_Send_H_prime is a HDCP2.2 Authentication msg.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
drivers/misc/mei/mei_hdcp.c | 65 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/mei_hdcp.h | 8 ++++++
2 files changed, 73 insertions(+)

diff --git a/drivers/misc/mei/mei_hdcp.c b/drivers/misc/mei/mei_hdcp.c
index 536c27701fe8..7977038e0642 100644
--- a/drivers/misc/mei/mei_hdcp.c
+++ b/drivers/misc/mei/mei_hdcp.c
@@ -208,6 +208,71 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data,
}
EXPORT_SYMBOL(mei_verify_receiver_cert_prepare_km);

+/**
+ * mei_verify_hprime:
+ * Function to verify AKE_Send_H_prime received
+ *
+ * @data : Intel HW specific Data
+ * @rx_hprime : Pointer for AKE_Send_H_prime
+ * @hprime_sz : Input buffer size
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+int mei_verify_hprime(struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_hprime *rx_hprime)
+{
+ struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
+ struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
+ enum me_status status;
+ struct device *dev;
+ ssize_t byte;
+
+ if (!data || !rx_hprime)
+ return -EINVAL;
+
+ /* check for the mei_device enabled or not */
+ if (!mei_cldev_active_and_enabled(data->cldev))
+ return -ENODEV;
+
+ dev = &data->cldev->dev;
+
+ send_hprime_in.header.api_version = HDCP_API_VERSION;
+ send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
+ send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
+ send_hprime_in.header.buffer_len = WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
+
+ send_hprime_in.port.integrated_port_type = data->port_type;
+ send_hprime_in.port.physical_port = data->port;
+
+ memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
+ sizeof(rx_hprime->h_prime));
+
+ /* Request to ME */
+ byte = mei_cldev_send(data->cldev, (u8 *)&send_hprime_in,
+ sizeof(send_hprime_in));
+ if (byte < 0) {
+ dev_err(dev, "mei_cldev_send failed. %d\n", (int)byte);
+ return byte;
+ }
+
+ /* Response from ME */
+ byte = mei_cldev_recv(data->cldev, (u8 *)&send_hprime_out,
+ sizeof(send_hprime_out));
+ if (byte < 0) {
+ dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+ return byte;
+ }
+
+ status = (enum me_status)send_hprime_out.header.status;
+ if (status != ME_HDCP_STATUS_SUCCESS) {
+ dev_err(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
+ WIRED_AKE_SEND_HPRIME, status);
+ return -1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(mei_verify_hprime);
+
static int mei_hdcp_probe(struct mei_cl_device *cldev,
const struct mei_cl_device_id *id)
{
diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
index 510a5c1ff1ff..3590e3421134 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -111,6 +111,8 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data,
bool *km_stored,
struct hdcp2_ake_no_stored_km *ek_pub_km,
size_t *msg_sz);
+int mei_verify_hprime(struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_hprime *rx_hprime);
#else
static inline
int mei_hdcp_cldev_get_reference(void *client_data,
@@ -140,5 +142,11 @@ mei_verify_receiver_cert_prepare_km(struct mei_hdcp_data *data,
{
return -ENODEV;
}
+static inline
+int mei_verify_hprime(struct mei_hdcp_data *data,
+ struct hdcp2_ake_send_hprime *rx_hprime)
+{
+ return -ENODEV;
+}
#endif /* defined (CONFIG_INTEL_MEI_HDCP) */
#endif /* defined (_LINUX_MEI_HDCP_H) */