[gnutls-devel] GnuTLS | nettle: check validity of (EC)DH shared secret before export (!1299)

[Development of GNU's TLS library]

Daiki Ueno commented on a discussion: https://gitlab.com/gnutls/gnutls/-/merge_requests/1299#note_381693263

I'm afraid it is not easily possible: the checks added in this MR are:
- to validate generated public key derived from the random source
- to validate shared secret, that also involves randomness
- to validate received public keys (this is covered by the existing tests)

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