From 445e42f4d37dca55bf08593cc732363db4a58fcc Mon Sep 17 00:00:00 2001
From: Paul Zinselmeyer <info@pfzetto.de>
Date: Mon, 8 Jul 2024 09:41:14 +0200
Subject: [PATCH] [Assignment-7] Add License / Copy Notices

---
 7-SGX_Hands-on/src/app/employee.c   |  1 -
 7-SGX_Hands-on/src/app/main.c       |  3 +++
 7-SGX_Hands-on/src/app/proxy.c      |  8 +++++---
 7-SGX_Hands-on/src/app/proxysetup.c |  4 ++++
 7-SGX_Hands-on/src/app/util.c       | 20 +++++++++++++++++---
 5 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/7-SGX_Hands-on/src/app/employee.c b/7-SGX_Hands-on/src/app/employee.c
index 379d51a..940b70d 100644
--- a/7-SGX_Hands-on/src/app/employee.c
+++ b/7-SGX_Hands-on/src/app/employee.c
@@ -83,7 +83,6 @@ int handle_employee(int argc, char** argv) {
      * Sign Firmware
      */
 
-
     mdctx = EVP_MD_CTX_new();
     if (EVP_DigestSignInit(mdctx, NULL, EVP_sha256(), NULL, key) != 1) {
         fprintf(stderr, "Message digest initialization failed.\n");
diff --git a/7-SGX_Hands-on/src/app/main.c b/7-SGX_Hands-on/src/app/main.c
index 1d08212..e39e9e4 100644
--- a/7-SGX_Hands-on/src/app/main.c
+++ b/7-SGX_Hands-on/src/app/main.c
@@ -8,6 +8,9 @@
 #include "util.h"
 
 
+/*
+ * main method of the binary calls the implementation of the specified subcommand
+ */
 int main(int argc, char** argv) {
     if(argc < 1)
         syntax_exit();
diff --git a/7-SGX_Hands-on/src/app/proxy.c b/7-SGX_Hands-on/src/app/proxy.c
index 70974e8..e80d424 100644
--- a/7-SGX_Hands-on/src/app/proxy.c
+++ b/7-SGX_Hands-on/src/app/proxy.c
@@ -11,8 +11,6 @@
 
 #include <sgx_tcrypto.h>
 
-
-
 #include "enclave_u.h"
 #include "proxy.h"
 #include "util.h"
@@ -221,6 +219,10 @@ static int ECDSA_SIG_to_sgx_signature(ECDSA_SIG* ecdsa_sig, sgx_ec256_signature_
     return (0);
 }
 
+/*
+ * This function is a modified version of the `sgx_ecdsa_verify_hash` function in the [Intel SGX crypto library](https://github.com/intel/linux-sgx/blob/main/sdk/tlibcrypto/sgxssl/sgx_ecc256_ecdsa.cpp).
+ * The specified License applies.
+ */
 static int sgx_signature_to_ECDSA_SIG(sgx_ec256_signature_t* sgx_signature, ECDSA_SIG** ecdsa_signature) {
 	BIGNUM *bn_r = NULL;
 	BIGNUM *bn_s = NULL;
@@ -318,7 +320,7 @@ int handle_proxy(int argc, char** argv) {
         syntax_exit();
 
     /*
-     * Read Signature Input
+     * Read And Parse Signature Input
      */
 
     ecdsa_signature_data = malloc(1024);
diff --git a/7-SGX_Hands-on/src/app/proxysetup.c b/7-SGX_Hands-on/src/app/proxysetup.c
index be4709d..0852633 100644
--- a/7-SGX_Hands-on/src/app/proxysetup.c
+++ b/7-SGX_Hands-on/src/app/proxysetup.c
@@ -28,6 +28,10 @@ char* proxysetup_syntax(void) {
         "    -token <path>   (optional) file path of the sgx token\n";
 }
 
+/*
+ * This function is a modified version of the `get_pub_key_from_coords` function in the [Intel SGX crypto library](https://github.com/intel/linux-sgx/blob/c1ceb4fe146e0feb1097dee81c7e89925443e43c/sdk/tlibcrypto/sgxssl/sgx_ecc256.cpp).
+ * The specified License applies.
+ */
 static EVP_PKEY *sgx_public_to_EVP_PKEY(const sgx_ec256_public_t *p_public)
 {
 	EVP_PKEY *evp_key = NULL;
diff --git a/7-SGX_Hands-on/src/app/util.c b/7-SGX_Hands-on/src/app/util.c
index 6cc715b..5a59ef2 100644
--- a/7-SGX_Hands-on/src/app/util.c
+++ b/7-SGX_Hands-on/src/app/util.c
@@ -39,13 +39,20 @@ void syntax_exit(void) {
 void set_bin_name(char* bin_name) {
     BIN_NAME = bin_name;
 }
-
+/*
+ * This definition is copied from the provided SGX Examples.
+ * The specified License applies.
+ */
 typedef struct _sgx_errlist_t {
     sgx_status_t err;
     const char *msg;
     const char *sug; /* Suggestion */
 } sgx_errlist_t;
 
+/*
+ * This definition is copied from the provided SGX Examples.
+ * The specified License applies.
+ */
 /* Error code returned by sgx_create_enclave */
 static sgx_errlist_t sgx_errlist[] = {
     {
@@ -124,7 +131,10 @@ static sgx_errlist_t sgx_errlist[] = {
         NULL
     },
 };
-
+/*
+ * This Method is copied from the provided SGX Examples.
+ * The specified License applies.
+ */
 /* Check error conditions for loading enclave */
 void sgx_print_error_message(sgx_status_t ret)
 {
@@ -139,11 +149,15 @@ void sgx_print_error_message(sgx_status_t ret)
             break;
         }
     }
-    
+
     if (idx == ttl)
     	printf("Error code is 0x%X. Please refer to the \"Intel SGX SDK Developer Reference\" for more details.\n", ret);
 }
 
+/*
+ * This Method is copied from the provided SGX Examples.
+ * The specified License applies.
+ */
 int initialize_enclave(char* token_path) {
     FILE* sgx_token_file = NULL;
     sgx_launch_token_t token = {0};