Add SHA-256 checksum calculation support

src/create.c

@@ -320,6 +320,11 @@ void *aaruf_create(const char *filepath, const uint32_t media_type, const uint32
         ctx->calculating_sha1 = true;
         aaruf_sha1_init(&ctx->sha1_context);
     }
+    if(parsed_options.sha256)
+    {
+        ctx->calculating_sha256 = true;
+        aaruf_sha256_init(&ctx->sha256_context);
+    }
 
     // Is writing
     ctx->isWriting = true;