The docs at

  
https://www.openssl.org/docs/man3.0/man3/SSL_CTX_set_tlsext_ticket_key_evp_cb.html

say "returns 0 to indicate the callback function was set"


The code (6d770c5ba36d43f4):

 int SSL_CTX_set_tlsext_ticket_key_evp_cb
    (SSL_CTX *ctx, int (*fp)(SSL *, unsigned char *, unsigned char *,
                             EVP_CIPHER_CTX *, EVP_MAC_CTX *, int))
 {
    ctx->ext.ticket_key_evp_cb = fp;
    return 1;
 }


(I suspect from my application code comments that
 SSL_CTX_set_tlsext_ticket_key_cb()  may suffer the same)
--
Cheers,
  Jeremy

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