Verifying a file signature with openssl dgst

openssl

I am trying to verify a signature for a file:

openssl dgst -verify cert.pem -signature file.sha1 file.data
  • all it says is "unable to load key file"

The certificate says:

openssl verify cert.pem 

cert.pem: /C=....
error 20 at 0 depth lookup:unable to get local issuer certificate

However, I specifically don't care about verifying the certificate, I want only to verify the signature for a given file!

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