I have searched and searched, and made many attempts to solve this, but until now I cannot solve this situation.

I need a code, that must be cross platform, since I must use it in Linux and Windows, that having a RSA Private and Public Key, that I can generate using openssl, I must be have to create a digital signature using the Private Key with the following parameters: x.509, UTF-8, Base 64, Little Endian, PKCS1 v1.5 padding, 1024 bytes size and Hash format SHA-1.

I already made some attempts to include openssl in QT, but I cannot find after hours searching good examples that can help me to solve this.

Any help will be great.

Paulo