/etc/opensips/tls/rootCA/private/cakey.pem is in opensips-tlsmgm-module 2.2.2-3build4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | -----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
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