[gnutls-devel] GnuTLS | hpke: allocate `kem_context` on heap instead of stack (#1882)

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Daiki Ueno created an issue: https://gitlab.com/gnutls/gnutls/-/work_items/1882



Currently, a static buffer of size `HPKE_MAX_INFO_LABEL_SIZE` (= 448)` is allocated for `kem_context`. This is reasonably small to have it on stack, though will be increased when we support PQ algorithms as in https://datatracker.ietf.org/doc/draft-ietf-hpke-pq/.

For future proof, it would probably be better to allocate it on heap.

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