--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/eax_done.c	Mon May 31 18:21:40 2004 +0000
@@ -0,0 +1,56 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, [email protected], http://libtomcrypt.org
+ */
+
+/* EAX Implementation by Tom St Denis */
+#include "mycrypt.h"
+
+#ifdef EAX_MODE
+
+int eax_done(eax_state *eax, unsigned char *tag, unsigned long *taglen)
+{
+   int           err;
+   unsigned char headermac[MAXBLOCKSIZE], ctmac[MAXBLOCKSIZE];
+   unsigned long x, len;
+
+   _ARGCHK(eax    != NULL);
+   _ARGCHK(tag    != NULL);
+   _ARGCHK(taglen != NULL);
+
+   /* finish ctomac */
+   len = sizeof(ctmac);
+   if ((err = omac_done(&eax->ctomac, ctmac, &len)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* finish headeromac */
+
+   /* note we specifically don't reset len so the two lens are minimal */
+
+   if ((err = omac_done(&eax->headeromac, headermac, &len)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* compute N xor H xor C */
+   for (x = 0; x < len && x < *taglen; x++) {
+       tag[x] = eax->N[x] ^ headermac[x] ^ ctmac[x];
+   }
+   *taglen = x;
+
+#ifdef CLEAN_STACK
+   zeromem(ctmac, sizeof(ctmac));
+   zeromem(headermac, sizeof(headermac));
+   zeromem(eax, sizeof(*eax));
+#endif
+
+   return CRYPT_OK;
+}
+
+#endif