ockam_key_exchange_core is used at run time in 5 crates (4 directly).

Depender (with downloads and own rev deps) ockam_key_exchange_core version
650 ockam ^0.7.0
130 3 ockam_key_exchange_xx ^0.7.0
120 2 ockam_channel ^0.7.0
1 ockam_key_exchange_x3dh ^0.7.0