Key Derivation throwing struct.error: unpack requires a buffer of 4 bytes

[ns-saurabh]

pykmip version is 0.10.0

super(Integer, self).read(istream, kmip_version=kmip_version)
File "/XXX/app-env/lib/python3.8/site-packages/kmip/core/primitives.py", line 105, in read
self.read_tag(istream) File "/XXX/app-env/lib/python3.8/site-packages/kmip/core/primitives.py", line 50, in read_tag
tag = unpack('!I', b'\x00' + tts[0:self.TAG_SIZE])[0]
struct.error: unpack requires a buffer of 4 bytes

Can somebody please help with the above issue?

I am using kmip version 1.2

and ssl version

ssl_version=PROTOCOL_SSLv23

[RickT256]

I am seeing this as an issue as well.

[ns-saurabh]

In my case the issue was that the CTM vault did not support key derivation via KMIP. Hence this error.
KMIP supports key derivation, and our CTM supports KMIP partially, but doesn't support key derivation using KMIP.

[RickT256]

Although I am working with CTM as well, I am seeing this issue crop up even if I am supplying the keys. The python code (which uses PyKMIP) that I wrote last year is now failing because of this ... bug. It is not clear to me what specifically has changed. I am going to investigate using versions of Python that prior to the latest release.

[RickT256]

Old versions of python are exhibiting the same behavior. Trying to figure out what has changed in the pykmip code that should cause this problem to now appear (but not appear earlier in the year).