Digital signature for a file using openssl

Question

Is there a way to digitally sign a x509 certificate or any document using openssl?

Answer 1

To digitally sign document in openssl it will work

For this first your certificate should be trusted it would be look like this

-----BEGIN TRUSTED CERTIFICATE-----
MIIDbjCCAlYCCQCOyunl25ProDANBgkqhkiG9w0BAQUFADB5MQswCQYDVQQGEwJJ
...
-----END TRUSTED CERTIFICATE-----

Then use following command

smime -sign -signer certificate.pem -inkey private.key -in test.txt \
    -out test1.txt -from ashish -to singhal