Different signatures when using C routines and openssl dgst, rsautl commands

Question

I am using following statement to create a RSA public and private key.

openssl genrsa -out ksign_private.pem 1024 openssl rsa -in ksign_private.pem -pubout > ksign_p

Answer 1

You can directly use dgst command to hash and sign data like:

openssl dgst -sha1 -binary -sign privkey.pem < myData > mySignature

see docs for all options.