Why not do a detached signature using e.g. gpg -sb --output file.sig file? Then, someone can run gpg --verify file.sig file to ensure that the signature is valid.
(a) because the OP specifically said he was looking for integrated signatures, and
(b) detached signatures have a way of getting lost, not distributed with the executables, and so on.
OpenPGP_signature
Description: OpenPGP digital signature
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