Can I see the checksum when I sign/verify a file?

[feitao]

Hi,

I wonder if I can actually see the sha1/md5 checksum when I sign/verify a
file. That is, when
  gpg -s -e somefile
  gpg -d somefile.gpg
is there an option to print out the checksum when signing/verifying the
file? (not --print-mds to calculate it again)

And how can I choose the hash method (sha1 or md5) when signing?

Thanks a million.
Fei