[gnutls-devel] GnuTLS | Support multiple identities for TLS 1.3 PSK (#1385)

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Hannes Reinecke created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1385



## Description of the feature:
Support multiple identities for PSK in TLS 1.3 as per RFC 8446 4.2.11.

## Applications that this feature may be relevant to:
NVMe-over-Fabrics TLS encryption has defined several possible identities per client.
To correctly support TLS 1.3 the client would need to include all of those identities in the Pre-Shared-Key ClientHello extension. With gnutls this is currently not possible, and so we have to restart negotiation when the wrong PSK had been presented.

## Is this feature implemented in other libraries (and which)
Not that I am aware.

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