param_cmp
int (*param_cmp)(const EVP_PKEY *a, const EVP_PKEY *b),
ameth->param_cmp = param_cmp;
int (*param_cmp)(const EVP_PKEY *a, const EVP_PKEY *b);
.param_cmp = dh_cmp_parameters,
.param_cmp = dsa_cmp_parameters,
.param_cmp = ec_cmp_parameters,
if (a->ameth && a->ameth->param_cmp)
return a->ameth->param_cmp(a, b);
if (a->ameth->param_cmp) {
ret = a->ameth->param_cmp(a, b);
.param_cmp = param_cmp_gost01,
param_table = sk_X509_VERIFY_PARAM_new(param_cmp);
int (*param_cmp)(const EVP_PKEY *a, const EVP_PKEY *b),