My clean, real-signed, non patched IOS58-v6432 dump is different :
CRC32: 68aa72fd
MD5: 1fe0b5e733a434918f1cf3dc354824be
Sha-1: dc2d79530a4a31204e94bc4c41dfa38c39b3e749
Maybe due to realsign, as it uses the console's key? but it that was the case, other users couldn't install it.