[PATCH 4/6] tee: Export uuidv5 generation for TEE clients

[Harshal Dev]

Export the uuidv5() function defined in the TEE core to all TEE backends.
This enables the TEE backend drivers to generate a UUID for identifying
and registering their secure services on the TEE bus.

Signed-off-by: Harshal Dev <harshal.dev@xxxxxxxxxxxxxxxx>
---
 drivers/tee/tee_core.c   |  9 +++++----
 include/linux/tee_core.h | 15 +++++++++++++++
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index 0783802fd010..61dd99bbf5f6 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -135,7 +135,7 @@ static int tee_release(struct inode *inode, struct file *filp)
 }
 
 /**
- * uuid_v5() - Calculate UUIDv5
+ * tee_generate_uuid_v5() - Calculate UUIDv5
  * @uuid: Resulting UUID
  * @ns: Name space ID for UUIDv5 function
  * @name: Name for UUIDv5 function
@@ -146,8 +146,8 @@ static int tee_release(struct inode *inode, struct file *filp)
  * This implements section (for SHA-1):
  * 4.3.  Algorithm for Creating a Name-Based UUID
  */
-static void uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
-		    size_t size)
+void tee_generate_uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
+			  size_t size)
 {
 	unsigned char hash[SHA1_DIGEST_SIZE];
 	struct sha1_ctx ctx;
@@ -163,6 +163,7 @@ static void uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
 	uuid->b[6] = (hash[6] & 0x0F) | 0x50;
 	uuid->b[8] = (hash[8] & 0x3F) | 0x80;
 }
+EXPORT_SYMBOL_GPL(tee_generate_uuid_v5);
 
 int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
 				 const u8 connection_data[TEE_IOCTL_UUID_LEN])
@@ -228,7 +229,7 @@ int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
 		goto out_free_name;
 	}
 
-	uuid_v5(uuid, &tee_client_uuid_ns, name, name_len);
+	tee_generate_uuid_v5(uuid, &tee_client_uuid_ns, name, name_len);
 out_free_name:
 	kfree(name);
 
diff --git a/include/linux/tee_core.h b/include/linux/tee_core.h
index f993d5118edd..13807e795880 100644
--- a/include/linux/tee_core.h
+++ b/include/linux/tee_core.h
@@ -266,6 +266,21 @@ void tee_device_set_dev_groups(struct tee_device *teedev,
 int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
 				 const u8 connection_data[TEE_IOCTL_UUID_LEN]);
 
+/**
+ * tee_generate_uuid_v5() - Calculate UUIDv5
+ * @uuid: Resulting UUID
+ * @ns: Name space ID for UUIDv5 function
+ * @name: Name for UUIDv5 function
+ * @size: Size of name
+ *
+ * UUIDv5 is specific in RFC 4122.
+ *
+ * This implements section (for SHA-1):
+ * 4.3.  Algorithm for Creating a Name-Based UUID
+ */
+void tee_generate_uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
+			  size_t size);
+
 /**
  * struct tee_shm_pool - shared memory pool
  * @ops:		operations

-- 
2.34.1