How to sign and verify through Openssl

[mania]

Hi,

I want to create private and public key with an extension of cer format, how to create it .By using privatekey file i have sign and verify through public key file .Can any one help me ...


Thanks in advance

[ChrisW67]

Yes, I am sure someone can help you. I suggest you look for OpenSSL man pages and tutorials.

[mania]

Thank for your suggestion , I have tried that but i am not getting what i needed

[amleto]

why do you think qt forum will be better place to ask than openssl help?

[ChrisW67]

Thank for your suggestion , I have tried that but i am not getting what i needed

Then you are either not asking the correct question, or not understanding the answer. For example, ".cer" does not describe a format for certificates, merely an arbitrary (fairly common) extension for an X.509 certificate in binary form. The PEM format and PKCS#12 format are other ways to store a certificate. Public and private keys are different to certificates, although a certificate will contain a public key and be signed with an unrelated private key.

You can create a self-signed certificate for testing... This is a very common request and many examples are easily Googled

[mania]

openssl genrsa -out privatetest.pem 1024 -------> Create private key in pem format

openssl rsa -in privatetest.pem -pubout > publictest.pem -------> Create public key in pem format

openssl rsautl -sign -inkey privatetest.pem -keyform PEM -in hash > signature -------> Signing with private key

openssl rsautl -verify -inkey publictest.pem -keyform PEM -in signature -------> Verifying with public key



I have tried the above commands in my PC , but i am not able to sign and verify . I am getting an error as "expecting private key "

What is the solution for the above commands..