int
generate_challenge(char **r_challenge, char **r_response, RSA * rsa)
{
unsigned char secret[32], *tmp;
unsigned long length, ret;
if(!rsa)
return -1;
if(get_randomness(secret, 32) == 0)
{
report_crypto_errors();
return -1;
}
*r_response = MyMalloc(65);
binary_to_hex(secret, *r_response, 32);
length = RSA_size(rsa);
tmp = MyMalloc(length);
ret = RSA_public_encrypt(32, secret, tmp, rsa, RSA_PKCS1_PADDING);
*r_challenge = MyMalloc((length << 1) + 1);
binary_to_hex(tmp, *r_challenge, length);
(*r_challenge)[length << 1] = 0;
MyFree(tmp);
if(ret < 0)
{
report_crypto_errors();
return (-1);
}
return (0);
}
/*===========================================================================*
* generic_handler *
*===========================================================================*/
static int generic_handler(irq_hook_t * hook)
{
/* This function handles hardware interrupt in a simple and generic way. All
* interrupts are transformed into messages to a driver. The IRQ line will be
* reenabled if the policy says so.
*/
int proc_nr;
/* As a side-effect, the interrupt handler gathers random information by
* timestamping the interrupt events. This is used for /dev/random.
*/
get_randomness(&krandom, hook->irq);
/* Check if the handler is still alive.
* If it's dead, this should never happen, as processes that die
* automatically get their interrupt hooks unhooked.
*/
if(!isokendpt(hook->proc_nr_e, &proc_nr))
panic("invalid interrupt handler: %d", hook->proc_nr_e);
/* Add a bit for this interrupt to the process' pending interrupts. When
* sending the notification message, this bit map will be magically set
* as an argument.
*/
priv(proc_addr(proc_nr))->s_int_pending |= (1 << hook->notify_id);
/* Build notification message and return. */
mini_notify(proc_addr(HARDWARE), hook->proc_nr_e);
return(hook->policy & IRQ_REENABLE);
}