diff mbox series

[v3,4/5] crypto: ccp: Fix sample application signature passing

Message ID 20230829150759.156126-5-mario.limonciello@amd.com
State Superseded
Headers show
Series Fixes for dynamic boost control for 6.6 | expand

Commit Message

Mario Limonciello Aug. 29, 2023, 3:07 p.m. UTC 
When parameters are sent the PSP returns back it's own signature
for the application to verify the authenticity of the result.

Display this signature to the caller instead of the one the caller
sent.

Fixes: f40d42f116cf ("crypto: ccp - Add a sample python script for Dynamic Boost Control")
Fixes: febe3ed3222f ("crypto: ccp - Add a sample library for ioctl use")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 tools/crypto/ccp/dbc.c  | 1 +
 tools/crypto/ccp/dbc.py | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/tools/crypto/ccp/dbc.c b/tools/crypto/ccp/dbc.c
index 7774e981849f..a807df0f0597 100644
--- a/tools/crypto/ccp/dbc.c
+++ b/tools/crypto/ccp/dbc.c
@@ -68,5 +68,6 @@  int process_param(int fd, int msg_index, __u8 *signature, int *data)
 		return errno;
 
 	*data = tmp.param;
+	memcpy(signature, tmp.signature, sizeof(tmp.signature));
 	return 0;
 }
diff --git a/tools/crypto/ccp/dbc.py b/tools/crypto/ccp/dbc.py
index 3956efe7537a..2b91415b1940 100644
--- a/tools/crypto/ccp/dbc.py
+++ b/tools/crypto/ccp/dbc.py
@@ -57,7 +57,8 @@  def process_param(device, message, signature, data=None):
     if type(message) != tuple:
         raise ValueError("Expected message tuple")
     arg = ctypes.c_int(data if data else 0)
-    ret = lib.process_param(device.fileno(), message[0], signature, ctypes.pointer(arg))
+    sig = ctypes.create_string_buffer(signature, len(signature))
+    ret = lib.process_param(device.fileno(), message[0], ctypes.pointer(sig), ctypes.pointer(arg))
     if ret:
         handle_error(ret)
-    return arg, signature
+    return arg.value, sig.value