Other network elements are not required.
Keychain is a basic feature of a switch and is not under license control.
Only the following switch models support Keychain:
S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S
For details about software mappings, visit Hardware Query Tool and search for the desired product model.
The keychain only manages authentication algorithms and keys and takes effect only after it is applied to an application.