Decrypting an Encrypt0 message

[nevelis]

Hey all - I'm just getting started with cose-c & I'm trying to figure out how to decrypt an Encrypt0 message. I'm trying to do something similar to this Python code: https://pycose.readthedocs.io/en/latest/examples.html#cose-encrypt0

I'm digging around the tests to see if I can figure this out but any starting point for loading a shared key & decrypting this type of message would be helpful. Are there any examples or code snippets to do this in C? Thanks in advance!

Aaron

[nevelis]

I was able to figure out how to decrypt a token generated in Python using the following code in C: https://github.com/Network-Tokens/example-tokens/blob/master/src/cose-test/main.cc

I've noticed that COSE_Encrypt_GetContent() returns a zero-length, even though it returns a valid pointer to the data. It looks like it is null-terminated so I'm able to use strlen() but I suspect this might be problematic... Any suggestions? This seems like a bug. The unit tests stop right before they extract & validate the data.

[nevelis]

I've created #126 to fix the zero-length issue (it finally became a problem when using binary data & strlen() was stopping early).