How did the hash value of the kernel image come from?

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Hi everyone:
I know to use sha1 and crc32 algorithms,I use the sha1 and crc32 commands directly, which is not the same as the boot log，but the hash for DTB is the same 。
I don't know why?

thanks！

This is the boot log：

log
log592×579 29.2 KB

kernel image hash:
hash
DTB hash:
fdt