/usr/lib/python3/dist-packages/Cryptodome/SelfTest/PublicKey/test_vectors/ECC/ecc_p256_public.pem is in python3-pycryptodome 3.4.7-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | -----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEpArVmiBQ6+kkeb1fsWuy5FtkZes8
srHv/kI/q+bLdCTbghnvC6uArPJv1wWVth/kdg0z7tgN0D0v0N+ye4znXA==
-----END PUBLIC KEY-----
|