initialize_copy

static VALUE
ossl_dsa_initialize_copy(VALUE self, VALUE other)
{
    EVP_PKEY *pkey;
    DSA *dsa, *dsa_new;

    GetPKey(self, pkey);
    if (EVP_PKEY_base_id(pkey) != EVP_PKEY_NONE)
        ossl_raise(eDSAError, "DSA already initialized");
    GetDSA(other, dsa);

    dsa_new = ASN1_dup((i2d_of_void *)i2d_DSAPrivateKey, (d2i_of_void *)d2i_DSAPrivateKey, (char *)dsa);
    if (!dsa_new)
        ossl_raise(eDSAError, "ASN1_dup");

    EVP_PKEY_assign_DSA(pkey, dsa_new);

    return self;
}