crypto: add support for x25119 and x448 key pair generation
This adds support for key pair generation for x25519 and x448 so that #26626 (closed) is one step closer.
Refs: #26626 (closed) - ECDH with x25519 and x448 keys
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines