I have some signed files that I would like to modify and then re-sign. I need 
to recover the signed_file to the unsigned state. The files were signed like 
this:

openssl smime -sign -in myfile.txt -out signed_file -signer mycert.crt -inkey 
mykey.key -certfile my-chain.crt -outform der -nodetach -passin file:mypass.pwd

The file is signed, but not encrypted.
Is there an openssl command that will do the recovery? The signing process 
seems to have added a binary header and footer. Could I just strip off the 
header and footer of the signed files? 

Thanks.
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