Digital Signing

[DiamonDogX]

Is there any easy way to digitally sign a file using Qt? Trying to avoid third party tools here... appreciate any suggestions, thanks.

[wysota]

Using what algorithm? You can probably use OpenSSL for that.

[DiamonDogX]

Maybe MD5, haven't decided. I almost thought of using the QCryptographicHash class, but didn't really come up with a clever way to package the generated hash with my file(s)...

[DiamonDogX]

I would ideally like to encrypt with a private key and the recipient would decrypt with the sender's public key, as is normally done with digital signatures...

[wysota]

Qt SSL functionality comes from OpenSSL, so you can use any OpenSSL function in your application.

By the way - MD5 is not a signature, it's a hash. Signature is most often a result of encryption of a hash of a file using the private key in asymetric cryptography.