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instance method
OpenSSL::PKey::EC::Group#cofactor
group.get_cofactor => cofactor_bn
ext/openssl/ossl_pkey_ec.c
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static VALUE ossl_ec_group_get_cofactor(VALUE self)
{
VALUE bn_obj;
BIGNUM *bn;
EC_GROUP *group = NULL;
GetECGroup(self, group);
bn_obj = ossl_bn_new(NULL);
bn = GetBNPtr(bn_obj);
if (EC_GROUP_get_cofactor(group, bn, ossl_bn_ctx) != 1)
ossl_raise(eEC_GROUP, "EC_GROUP_get_cofactor");
return bn_obj;
}
Returns the cofactor of the group.
See the OpenSSL documentation for EC_GROUP_get_cofactor()