iptsec: remove trailing

Using BASE64_MINSIZE() newly defined in base64.h

darcs-hash:20070206213232-65a35-7e0ff7da46502f9d7506a699eb7796581989454f.gz

libsofia-sip-ua/ipt/sofia-sip/base64.h

@@ -57,6 +57,9 @@ SOFIAPUBFUN isize_t base64_e(char buf[], isize_t bsiz, void *data, isize_t dsiz)
 /** Calculate size of n bytes encoded in base64 */
 #define BASE64_SIZE(n) ((((n) + 2) / 3) * 4)
 
+/** Calculate size of n bytes encoded in base64 sans trailing =. @NEW_1_12_5 */
+#define BASE64_MINSIZE(n) ((n * 4 + 2) / 3)
+
 SOFIA_END_DECLS
 
 #endif /* !BASE_64 */

libsofia-sip-ua/iptsec/auth_client.c

@@ -770,12 +770,13 @@ static int auc_digest_challenge(auth_client_t *ca, msg_auth_t const *ch)
   if (ac->ac_qop && (cda->cda_cnonce == NULL || ac->ac_stale)) {
     su_guid_t guid[1];
     char *cnonce;
+    size_t b64len = BASE64_MINSIZE(sizeof(guid)) + 1;
     if (cda->cda_cnonce != NULL)
       /* Free the old one if we are updating after stale=true */
       su_free(home, (void *)cda->cda_cnonce);
     su_guid_generate(guid);
-    cda->cda_cnonce = cnonce = su_alloc(home, BASE64_SIZE(sizeof(guid)) + 1);
-    base64_e(cnonce, BASE64_SIZE(sizeof(guid)) + 1, guid, sizeof(guid));
+    cda->cda_cnonce = cnonce = su_alloc(home, b64len);
+    base64_e(cnonce, b64len, guid, sizeof(guid));
     cda->cda_ncount = 0;
   }
 

libsofia-sip-ua/iptsec/auth_module.c

@@ -608,7 +608,7 @@ struct nonce {
   uint8_t    digest[6];
 };
 
-#define AUTH_DIGEST_NONCE_LEN (BASE64_SIZE(sizeof (struct nonce)) + 1)
+#define AUTH_DIGEST_NONCE_LEN (BASE64_MINSIZE(sizeof (struct nonce)) + 1)
 
 /** Authenticate a request with @b Digest authentication scheme.
  *