diff --git a/trial3/ECCtrial.c b/trial3/ECCtrial.c
index 2956f3a..2a1aff5 100644
--- a/trial3/ECCtrial.c
+++ b/trial3/ECCtrial.c
@@ -59,22 +59,25 @@ void main()
 
 
 	
-  mbedtls_sha256_context * sha_ctx;
-  mbedtls_sha256_init(sha_ctx);
+  mbedtls_sha256_context sha_ctx;
+  mbedtls_sha256_init(&sha_ctx);
 
+  
+  mbedtls_sha256_starts_ret(&sha_ctx,0);
+  mbedtls_sha256_update_ret(&sha_ctx, UDS_ID, 32);
+  mbedtls_sha256_update_ret(&sha_ctx, FW_ID, 32);
+  mbedtls_sha256_finish_ret(&sha_ctx,CD_ID);
 
-  mbedtls_sha256_starts_ret(sha_ctx,0);
-  mbedtls_sha256_update_ret(sha_ctx, UDS_ID, 32);
-  mbedtls_sha256_update_ret(sha_ctx, FW_ID, 32);
-  mbedtls_sha256_finish_ret(sha_ctx,CD_ID);
-
-  mbedtls_sha256_free(sha_ctx);
+  mbedtls_sha256_free(&sha_ctx);
+  free(UDS_ID);
+  free(FW_ID);
 
   for(int i = 0; i < 32; i++)
     printf("%hhx",CD_ID[i]);
   printf(" :  CDI digest\n");
 	
 
+
   printf("SUCCESSUL EXIT\n");
 
 }
diff --git a/trial3/layer1.c b/trial3/layer1.c
index c839a57..b0e4b7c 100644
--- a/trial3/layer1.c
+++ b/trial3/layer1.c
@@ -136,6 +136,7 @@ int _calcCDID(uint8_t * CDID)
   
   free(UDS_ID);
   free(FW_ID);
+  mbedtls_sha256_free(sha_ctx);
   return RIOTSUCCESS;
 
 }