gnutls_x509_crt_check_issuer - API function
unsigned gnutls_x509_crt_check_issuer(gnutls_x509_crt_t cert, gnutls_x509_crt_t issuer);
This function will check if the given certificate was issued by the given issuer. It checks the DN fields and the authority key identifier and subject key identifier fields match.
If the same certificate is provided at the cert and issuer fields, it will check whether the certificate is self-signed.
It will return true (1) if the given certificate is issued by the given issuer, and false (0) if not.
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