Problem - Kevin Tafuro

* Confirmation receipts must be received within one hour (3600 seconds) */
#define SPC_CONFIRMATION_EXPIRE 3600
typedef struct {
char *address;
char *id;
time_t expire;
} spc_confirmation_t;
static unsigned long confirmation_count, confirmation_size;
static spc_confirmation_t *confirmations;
static int new_confirmation(const char *address, const char *id) {
unsigned long i;
spc_confirmation_t *tmp;
/* first make sure that the address isn't already in the list */
for (i = 0; i < confirmation_count; i++)
if (!strcmp(confirmations[i].address, address)) return 0;
if (confirmation_count = = confirmation_size) {
tmp = (spc_confirmation_t *)realloc(confirmations,
sizeof(spc_confirmation_t) * (confirmation_size + 1));
if (!tmp) return 0;
confirmations = tmp;
confirmation_size++;
}
confirmations[confirmation_count].address = strdup(address);
confirmations[confirmation_count].id = strdup(id);
confirmations[confirmation_count].expire = time(0) + SPC_CONFIRMATION_EXPIRE;
if (!confirmations[confirmation_count].address ||
!confirmations[confirmation_count].id) {
if (confirmations[confirmation_count].address)
free(confirmations[confirmation_count].address);
if (confirmations[confirmation_count].id)
free(confirmations[confirmation_count].id);
return 0;
}
confirmation_count++;
return 1;
}
int spc_confirmation_create(const char *address, char **id) {
unsigned char buf[16];
if (!spc_rand(buf, sizeof(buf))) return 0;
if (!(*id = (char *)spc_base64_encode(buf, sizeof(buf), 0))) return 0;
if (!new_confirmation(address, *id)) {
free(*id);
return 0;
}
return 1;
}
450 | Chapter 8: Authentication and Key Exchange
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