if (key->modulus) freebn(key->modulus);
if (key->exponent) freebn(key->exponent);
if (key->private_exponent) freebn(key->private_exponent);
if (key->modulus) freebn(key->modulus);
if (key->exponent) freebn(key->exponent);
if (key->private_exponent) freebn(key->private_exponent);