[Assignment-7] size ecalls

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

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);
     };

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);