int
rsa_public_key_prepare(struct rsa_public_key *key)
{
key->size = _rsa_check_size(key->n);
return (key->size > 0);
}
int
rsa_private_key_prepare(struct rsa_private_key *key)
{
mpz_t n;
/* The size of the product is the sum of the sizes of the factors,
* or sometimes one less. It's possible but tricky to compute the
* size without computing the full product. */
mpz_init(n);
mpz_mul(n, key->p, key->q);
key->size = _rsa_check_size(n);
mpz_clear(n);
return (key->size > 0);
}