This function sets a callback to be called when peer's
certificate has been received in order to verify it on receipt
rather than doing after the handshake is completed.
The callback's function prototype is: int
If the callback function is provided then gnutls will call it, in
the handshake, just after the certificate message has been
received. To verify or obtain the certificate the
functions can be used.
The callback function should return 0 for the handshake to
continue or non-zero to terminate.
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