Make message buffer const in ECC sign

Mark the buffer to sign as `const` in `xxx_ecc_generate_signature()` to
reflect that the input buffer is not modified. This improves
const-correctness and clarifies the API contract.

Author: parmi93

api/stse_ecc.c

@@ -57,7 +57,7 @@ stse_ReturnCode_t stse_ecc_generate_signature(
     stse_Handler_t *pSTSE,
     PLAT_UI8 slot_number,
     stse_ecc_key_type_t key_type,
-    PLAT_UI8 *pMessage,
+    const PLAT_UI8 *pMessage,
     PLAT_UI16 message_length,
     PLAT_UI8 *pSignature) {
     stse_ReturnCode_t ret;

api/stse_ecc.h

@@ -86,7 +86,7 @@ stse_ReturnCode_t stse_ecc_generate_signature(
     stse_Handler_t *pSTSE,
     PLAT_UI8 slot_number,
     stse_ecc_key_type_t key_type,
-    PLAT_UI8 *pMessage,
+    const PLAT_UI8 *pMessage,
     PLAT_UI16 message_length,
     PLAT_UI8 *pSignature);
 

services/stsafea/stsafea_ecc.c

@@ -343,7 +343,7 @@ stse_ReturnCode_t stsafea_ecc_generate_signature(
     stse_Handler_t *pSTSE,
     PLAT_UI8 slot_number,
     stse_ecc_key_type_t key_type,
-    PLAT_UI8 *pMessage,
+    const PLAT_UI8 *pMessage,
     PLAT_UI16 message_length,
     PLAT_UI8 *pSignature) {
     PLAT_UI8 cmd_header = STSAFEA_CMD_GENERATE_SIGNATURE;
@@ -368,7 +368,7 @@ stse_ReturnCode_t stsafea_ecc_generate_signature(
     stse_frame_element_allocate_push(&CmdFrame, eCmd_header, STSAFEA_HEADER_SIZE, &cmd_header);
     stse_frame_element_allocate_push(&CmdFrame, eSlot_number, STSAFEA_SLOT_NUMBER_ID_SIZE, &slot_number);
     stse_frame_element_allocate_push(&CmdFrame, eMessage_length, STSAFEA_GENERIC_LENGTH_SIZE, (PLAT_UI8 *)&message_length);
-    stse_frame_element_allocate_push(&CmdFrame, eMessage, message_length, pMessage);
+    stse_frame_element_allocate_push(&CmdFrame, eMessage, message_length, (PLAT_UI8 *)pMessage);
     stse_frame_element_swap_byte_order(&eMessage_length);
 
     stse_frame_allocate(RspFrame);

services/stsafea/stsafea_ecc.h

@@ -124,7 +124,7 @@ stse_ReturnCode_t stsafea_ecc_generate_signature(
     stse_Handler_t *pSTSE,
     PLAT_UI8 slot_number,
     stse_ecc_key_type_t key_type,
-    PLAT_UI8 *pMessage,
+    const PLAT_UI8 *pMessage,
     PLAT_UI16 message_length,
     PLAT_UI8 *pSignature);
 

services/stsafel/stsafel_ecc.c

@@ -25,7 +25,7 @@
 stse_ReturnCode_t stsafel_ecc_generate_signature(
     stse_Handler_t *pSTSE,
     stse_ecc_key_type_t key_type,
-    PLAT_UI8 *pChallenge,
+    const PLAT_UI8 *pChallenge,
     PLAT_UI16 challenge_length,
     PLAT_UI8 *pSignature) {
     PLAT_UI8 cmd_header = STSAFEL_CMD_GENERATE_SIGNATURE;
@@ -44,7 +44,7 @@ stse_ReturnCode_t stsafel_ecc_generate_signature(
     /*- Create CMD frame and populate elements */
     stse_frame_allocate(CmdFrame);
     stse_frame_element_allocate_push(&CmdFrame, eCmd_header, STSAFEL_HEADER_SIZE, &cmd_header);
-    stse_frame_element_allocate_push(&CmdFrame, eChallenge, challenge_length, pChallenge);
+    stse_frame_element_allocate_push(&CmdFrame, eChallenge, challenge_length, (PLAT_UI8 *)pChallenge);
     stse_frame_element_allocate_push(&CmdFrame, eInternal_data_subject, 1, &internal_data_subject);
 
     /*- Create Rsp frame and populate elements*/

services/stsafel/stsafel_ecc.h

@@ -48,7 +48,7 @@
 stse_ReturnCode_t stsafel_ecc_generate_signature(
     stse_Handler_t *pSTSE,
     stse_ecc_key_type_t key_type,
-    PLAT_UI8 *pChallenge,
+    const PLAT_UI8 *pChallenge,
     PLAT_UI16 challenge_length,
     PLAT_UI8 *pSignature);