root@imx6ull14x14evk:~# kobs-ng imgverify -v -kF315B19099EF27C626B10686ABDD61DC u-boot-nand-signed.imx
u-boot-nand-signed.imx: verifying using key 'f315b19099ef27c626b10686abdd61dc'
u-boot-nand-signed.imx: is a valid bootstream for key 'f315b19099ef27c626b10686abdd61dc'
I add one to the key, and it still works:
root@imx6ull14x14evk:~# kobs-ng imgverify -v -kF315B19099EF27C626B10686ABDD61DD u-boot-nand-signed.imx
u-boot-nand-signed.imx: verifying using key 'f315b19099ef27c626b10686abdd61dd'
u-boot-nand-signed.imx: is a valid bootstream for key 'f315b19099ef27c626b10686abdd61dd'