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-rw-r--r--fticks.c37
1 files changed, 31 insertions, 6 deletions
diff --git a/fticks.c b/fticks.c
index 0147f1b..8d41c4f 100644
--- a/fticks.c
+++ b/fticks.c
@@ -4,6 +4,8 @@
#include <stdio.h> /* For sprintf(). */
#include <string.h>
+#include <ctype.h>
+#include <errno.h>
#include <nettle/sha.h>
#include <nettle/hmac.h>
@@ -129,18 +131,41 @@ out:
by lowercasing it, removing all but [0-9a-f] and truncating it at
the first ';' found. The truncation is done because RADIUS
supposedly has a praxis of tacking on SSID to the MAC address in
- Calling-Station-Id. */
-void
+ Calling-Station-Id.
+
+ \return 0 on success, -ENOMEM on out of memory.
+*/
+int
fticks_hashmac(const uint8_t *in,
const uint8_t *key,
size_t out_len,
uint8_t *out)
{
- /* TODO: lowercase */
- /* TODO: s/[!0-9a-f]//1 */
- /* TODO: truncate after first ';', if any */
+ uint8_t *in_copy = NULL;
+ uint8_t *p = NULL;
+ int i;
+
+ in_copy = calloc(1, strlen(in) + 1);
+ if (in_copy == NULL)
+ return -ENOMEM;
+
+ /* Sanitise and lowercase 'in' into 'in_copy'. */
+ for (i = 0, p = in_copy; in[i] != '\0'; i++) {
+ if (in[i] == ';') {
+ *p++ = '\0';
+ break;
+ }
+ if (in[i] >= '0' && in[i] <= '9') {
+ *p++ = in[i];
+ }
+ else if (tolower(in[i]) >= 'a' && tolower(in[i]) <= 'f') {
+ *p++ = tolower(in[i]);
+ }
+ }
- _hash(in, key, out_len, out);
+ _hash(in_copy, key, out_len, out);
+ free(in_copy);
+ return 0;
}
void