build+docs: Updating doxygen target

Change-Id: I291a5e08ef5406490e52d876d57db8ee22c84a4b
name: Make 'at' method to check if requested components is in bounds

Change-Id: I28744a694e1ead48892bb3cfe918b7132b769a5a
security: Change SHA256_DIGEST_LENGTH to SHA256_DIGEST_SIZE;

Change-Id: Ib490cfec5e9331575567b346810d1bc56bc97ea1