[Assignment-7] add SGX sample code from VM

Assignment 7 - SGX Hands-on/SGX101_sample_code-master/Sealing/App/sgx_utils/sgx_utils.cpp

@@ -0,0 +1,83 @@
+#include <cstdio>
+#include <cstring>
+#include "sgx_urts.h"
+#include "sgx_utils.h"
+
+#ifndef TRUE
+# define TRUE 1
+#endif
+
+#ifndef FALSE
+# define FALSE 0
+#endif
+
+/* Check error conditions for loading enclave */
+void print_error_message(sgx_status_t ret) {
+    printf("SGX error code: %d\n", ret);
+}
+
+/* Initialize the enclave:
+ *   Step 1: try to retrieve the launch token saved by last transaction
+ *   Step 2: call sgx_create_enclave to initialize an enclave instance
+ *   Step 3: save the launch token if it is updated
+ */
+int initialize_enclave(sgx_enclave_id_t* eid, const std::string& launch_token_path, const std::string& enclave_name) {
+    const char* token_path = launch_token_path.c_str();
+    sgx_launch_token_t token = {0};
+    sgx_status_t ret = SGX_ERROR_UNEXPECTED;
+    int updated = 0;
+
+    /* Step 1: try to retrieve the launch token saved by last transaction
+     *         if there is no token, then create a new one.
+     */
+    /* try to get the token saved in $HOME */
+    FILE* fp = fopen(token_path, "rb");
+    if (fp == NULL && (fp = fopen(token_path, "wb")) == NULL) {
+        printf("Warning: Failed to create/open the launch token file \"%s\".\n", token_path);
+    }
+
+    if (fp != NULL) {
+        /* read the token from saved file */
+        size_t read_num = fread(token, 1, sizeof(sgx_launch_token_t), fp);
+        if (read_num != 0 && read_num != sizeof(sgx_launch_token_t)) {
+            /* if token is invalid, clear the buffer */
+            memset(&token, 0x0, sizeof(sgx_launch_token_t));
+            printf("Warning: Invalid launch token read from \"%s\".\n", token_path);
+        }
+    }
+    /* Step 2: call sgx_create_enclave to initialize an enclave instance */
+    /* Debug Support: set 2nd parameter to 1 */
+    ret = sgx_create_enclave(enclave_name.c_str(), SGX_DEBUG_FLAG, &token, &updated, eid, NULL);
+    if (ret != SGX_SUCCESS) {
+        print_error_message(ret);
+        if (fp != NULL) fclose(fp);
+        return -1;
+    }
+
+    /* Step 3: save the launch token if it is updated */
+    if (updated == FALSE || fp == NULL) {
+        /* if the token is not updated, or file handler is invalid, do not perform saving */
+        if (fp != NULL) fclose(fp);
+        return 0;
+    }
+
+    /* reopen the file with write capablity */
+    fp = freopen(token_path, "wb", fp);
+    if (fp == NULL) return 0;
+    size_t write_num = fwrite(token, 1, sizeof(sgx_launch_token_t), fp);
+    if (write_num != sizeof(sgx_launch_token_t))
+        printf("Warning: Failed to save launch token to \"%s\".\n", token_path);
+    fclose(fp);
+    return 0;
+}
+
+bool is_ecall_successful(sgx_status_t sgx_status, const std::string& err_msg,
+        sgx_status_t ecall_return_value) {
+    if (sgx_status != SGX_SUCCESS || ecall_return_value != SGX_SUCCESS) {
+        printf("%s\n", err_msg.c_str());
+        print_error_message(sgx_status);
+        print_error_message(ecall_return_value);
+        return false;
+    }
+    return true;
+}

Assignment 7 - SGX Hands-on/SGX101_sample_code-master/Sealing/App/sgx_utils/sgx_utils.h

@@ -0,0 +1,12 @@
+#ifndef SGX_UTILS_H_
+#define SGX_UTILS_H_
+
+#include <string>
+
+void print_error_message(sgx_status_t ret);
+
+int initialize_enclave(sgx_enclave_id_t* eid, const std::string& launch_token_path, const std::string& enclave_name);
+
+bool is_ecall_successful(sgx_status_t sgx_status, const std::string& err_msg, sgx_status_t ecall_return_value = SGX_SUCCESS);
+
+#endif // SGX_UTILS_H_