Create p12 from a .pem with only a private key

[Estefania]

I do not know if I explained well, i have a .pem with a private key inside
like this.

-----BEGIN PRIVATE KEY-----
masdfasdfasdfasdfasdfasdfasdff
asdfasdfasdfasdfasdfasdfasdfasf
asdfasfasdfasdfasdfasdfasdfasdf
-----END PRIVATE KEY-----


and i need to convert it to .p12

do i need a certificate aswell?

I have tried what you suggest:
$ openssl req -x509 -subj /CN=foo -keyout /dev/null -nodes | openssl pkcs12
-out x.p12 -export -nokeys
Generating a 2048 bit RSA private key
................+++
.+++
writing new private key to 'nul'
-----
Subject does not start with '/'.
problems making Certificate Request
unable to load certificates

Thanks!





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