One of the main frustrations is you don't know if the output is correct until you manage to reproduce some known key/document exactly.
When you're debugging anything else, you can sort of see what's wrong as you come closer to a correct solution. A crypto scheme is only correct (you've put the right things in the right places) when it's exactly right. Until then, you have a jumble of characters.
It took me ages to match ECDSA on java with Python. In the end, it was because of some fine print where I needed to hash one version but not the other before signing.
One of the main frustrations is you don't know if the output is correct until you manage to reproduce some known key/document exactly.
When you're debugging anything else, you can sort of see what's wrong as you come closer to a correct solution. A crypto scheme is only correct (you've put the right things in the right places) when it's exactly right. Until then, you have a jumble of characters.
It took me ages to match ECDSA on java with Python. In the end, it was because of some fine print where I needed to hash one version but not the other before signing.