Hi Wayne,
Is your question more about how to produce a digital signature over some bytes (and then subsequently verify it)
such as the examples found in OpenSSLDigitalSignatureExamples?
Or does your question relate more to, once you have some sort of digital signature over the bytes of an image...where do you put it?
An example is the jarsigner which puts stores algo params and signatures in the META-INF dir of a jar(zip) file?
BTW, Merry Christmas/Happy Holidays to you and your team.
- Seth