> On Mar 8, 2018, at 11:25 AM, e...@coderhacks.com wrote:
>
> # openssl cms -sign -in myfile.txt -md md5 -signer cer.txt -inkey key.txt
> -outform PEM > pem.txt
>
> # md5sum myfile.txt
>
> Can I expect to find the md5sum checksum somewhere in the ASN1 of pem.txt???
>
> # openssl asn1parse -in pem.txt
>
> As far I see it is not there - but maybe it is just a quick step to it?
When signing, the checksum is part of the signature, so you'd have to
decrypt the signature block with the signer's public key via:
openssl rsautl -pubin -raw -encrypt -inkey pubkey.pem
and find the message digest there.
--
Viktor.
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