From 83ad706ad74f11bd6961f795ded49a910b49a464 Mon Sep 17 00:00:00 2001
From: Sascha Tommasone <sascha@tommasone.me>
Date: Tue, 2 Jul 2024 23:08:24 +0200
Subject: [PATCH] [Assignment-7] size ecalls

---
 .../src/enclave/enclave.c                     | 27 +++++++++++++++++++
 .../src/enclave/enclave.edl                   |  4 +++
 .../src/enclave/enclave.h                     |  7 ++++-
 3 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/Assignment 7 - SGX Hands-on/src/enclave/enclave.c b/Assignment 7 - SGX Hands-on/src/enclave/enclave.c
index 5c74dff..12a4a3a 100644
--- a/Assignment 7 - SGX Hands-on/src/enclave/enclave.c	
+++ b/Assignment 7 - SGX Hands-on/src/enclave/enclave.c	
@@ -41,6 +41,33 @@
 #include <sgx_error.h>
 #include <sgx_tcrypto.h>
 
+#ifndef SK_SIZE
+#define SK_SIZE SGX_ECP256_KEY_SIZE
+#endif
+
+#ifndef PK_SIZE
+#define PK_SIZE 2*SK_SIZE
+#endif
+
+#ifndef SI_SIZE
+#define SI_SIZE 2*SK_SIZE
+#endif
+
+int get_sealed_size() {
+    return sgx_calc_sealed_data_size(PK_SIZE, SK_SIZE);
+}
+
+int get_signature_size() {
+    return SI_SIZE;
+}
+
+int get_public_key_size() {
+    return PK_SIZE;
+}
+
+int get_private_key_size() {
+    return SK_SIZE;
+}
 
 sgx_status_t seal_key_pair(sgx_ec256_private_t *private, sgx_ec256_public_t *public, uint8_t *sealed, uint32_t *sealed_size) {
     // handle missing keypair
diff --git a/Assignment 7 - SGX Hands-on/src/enclave/enclave.edl b/Assignment 7 - SGX Hands-on/src/enclave/enclave.edl
index 1764531..81363d4 100644
--- a/Assignment 7 - SGX Hands-on/src/enclave/enclave.edl	
+++ b/Assignment 7 - SGX Hands-on/src/enclave/enclave.edl	
@@ -40,6 +40,10 @@ enclave {
      */
     
     trusted {
+        public int get_sealed_size();
+        public int get_signature_size();
+        public int get_public_key_size();
+        public int get_private_key_size();
         public sgx_status_t public_key([in, size=sealed_size]const uint8_t *sealed, size_t sealed_size, [out]uint8_t *gx, [out]uint8_t *gy);
         public sgx_status_t sign_firmware([in, size=data_size]const uint8_t *sealed, size_t sealed_size, [in, size=data_size]uint8_t *data, size_t data_size, [out, size=signature_size]uint8_t *signature, size_t signature_size);
     };
diff --git a/Assignment 7 - SGX Hands-on/src/enclave/enclave.h b/Assignment 7 - SGX Hands-on/src/enclave/enclave.h
index 9a6fb95..2a26180 100644
--- a/Assignment 7 - SGX Hands-on/src/enclave/enclave.h	
+++ b/Assignment 7 - SGX Hands-on/src/enclave/enclave.h	
@@ -33,12 +33,17 @@
 #ifndef _ENCLAVE_H_
 #define _ENCLAVE_H_
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <assert.h>
-#include <stdio.h>
 #include <sgx_error.h>
 
+int get_sealed_size();
+int get_signature_size();
+int get_public_key_size();
+int get_private_key_size();
+
 sgx_status_t public_key(const uint8_t *sealed, const size_t sealed_size, uint8_t *gx, uint8_t *gy); 
 sgx_status_t sign_firmware(const uint8_t *sealed, size_t sealed_size, uint8_t *data, size_t data_size, uint8_t *signature, size_t signature_size);