Looking at gnutls 2.10 source, gnutls_certificate_set_x509_key() calls an internal function, _gnutls_x509_privkey_to_gkey() to essentially make a copy of the contents of the gnutls_x509_privkey_t parameter. So, in 2.10, the caller to gnutls_certificate_set_x509_key() maintains exclusive ownership of the gnutls_x509_privkey_t. The caller can destroy the gnutls_x509_privkey_t as soon as gnutls_certificate_set_x509_key() returns, without affecting the credentials object. That's what I am doing.
In gnutls 2.12, gnutls_certificate_set_x509_key() is completely different. It looks to me like in 2.12, the gnutls_certificate_credentials_t object saves a pointer to the gnutls_x509_privkey_t structure, essentially, so it /cannot/ be destroyed, and must remain in existence as long as gnutls_certificate_credentials_t exists, correct? I was destroying gnutls_x509_privkey_t immediately after gnutls_certificate_set_x509_key(), I no longer needed it. This works in 2.10, but doesn't appear to work in 2.12.
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