--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ocb_done_decrypt.c	Mon May 31 18:21:40 2004 +0000
@@ -0,0 +1,51 @@
+/* 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
+ */
+
+/* OCB Implementation by Tom St Denis */
+#include "mycrypt.h"
+
+#ifdef OCB_MODE
+
+int ocb_done_decrypt(ocb_state *ocb, 
+                     const unsigned char *ct,  unsigned long ctlen,
+                           unsigned char *pt, 
+                     const unsigned char *tag, unsigned long taglen, int *res)
+{
+   int err;
+   unsigned char tagbuf[MAXBLOCKSIZE];
+   unsigned long tagbuflen;
+
+   _ARGCHK(ocb != NULL);
+   _ARGCHK(pt  != NULL);
+   _ARGCHK(ct  != NULL);
+   _ARGCHK(tag != NULL);
+   _ARGCHK(res != NULL);
+
+   *res = 0;
+
+   tagbuflen = sizeof(tagbuf);
+   if ((err = __ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) {
+      return err;
+   }
+
+   if (taglen <= tagbuflen && memcmp(tagbuf, tag, taglen) == 0) {
+      *res = 1;
+   }
+
+#ifdef CLEAN_STACK
+   zeromem(tagbuf, sizeof(tagbuf));
+#endif
+
+   return CRYPT_OK;
+}
+
+#endif
+