parsing a line

Hello all

I have the following small file that i am parsing one line at a time
(each line consists of hex values)

line 1: 0d
line 2: 00000000
line 3: 00002000
line 4: 0064
line 5: 76d457ed462df78c7cfde9f9e33724c6
line 6: bded7a7b9f6d763e
line 7: 0059010081bb300597603b6f90ef4421
line 8: 001608427754e957a0d281bb30059760
line 9: a72f731c3be600000000000000000000


For line 5, for example, i want to break it up into chunks of 8 hex
charaters (ie for example 76d457ed, 462df78c etc).
I tried to use the shift operator (ie << or >>) but perl gives an
error.

Any help with the above would be appreciated.

Thanks