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diff --git a/libtomcrypt/src/modes/ofb/ofb_done.c b/libtomcrypt/src/modes/ofb/ofb_done.c
new file mode 100644
index 0000000..9caddbe
--- /dev/null
+++ b/libtomcrypt/src/modes/ofb/ofb_done.c
@@ -0,0 +1,40 @@
+/* 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.
+ */
+#include "tomcrypt.h"
+
+/**
+   @file ofb_done.c
+   OFB implementation, finish chain, Tom St Denis
+*/
+
+#ifdef LTC_OFB_MODE
+
+/** Terminate the chain
+  @param ofb    The OFB chain to terminate
+  @return CRYPT_OK on success
+*/
+int ofb_done(symmetric_OFB *ofb)
+{
+   int err;
+   LTC_ARGCHK(ofb != NULL);
+
+   if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
+      return err;
+   }
+   cipher_descriptor[ofb->cipher].done(&ofb->key);
+   return CRYPT_OK;
+}
+
+
+
+#endif
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */