Move source files to src/, add Makefile, fix all build and linkage errors, etc.

exosphere/src/gcm.h

@@ -0,0 +1,13 @@
+#ifndef EXOSPHERE_GCM_H
+#define EXOSPHERE_GCM_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+size_t gcm_decrypt_key(void *dst, size_t dst_size,
+                       const void *src, size_t src_size,
+                       const void *sealed_kek, size_t kek_size,
+                       const void *wrapped_key, size_t key_size,
+                       unsigned int usecase, bool is_personalized);
+
+#endif