--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtomcrypt/src/mac/blake2/blake2bmac_file.c	Fri Feb 09 21:44:05 2018 +0800
@@ -0,0 +1,83 @@
+/* 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"
+
+#ifdef LTC_BLAKE2BMAC
+
+/**
+  BLAKE2B MAC a file
+  @param fname    The name of the file you wish to BLAKE2B MAC
+  @param key      The secret key
+  @param keylen   The length of the secret key
+  @param mac      [out] The BLAKE2B MAC authentication tag
+  @param maclen   [in/out]  The max size and resulting size of the authentication tag
+  @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
+*/
+int blake2bmac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
+{
+#ifdef LTC_NO_FILE
+   return CRYPT_NOP;
+#else
+   blake2bmac_state st;
+   FILE *in;
+   unsigned char *buf;
+   size_t x;
+   int err;
+
+   LTC_ARGCHK(fname  != NULL);
+   LTC_ARGCHK(key    != NULL);
+   LTC_ARGCHK(mac    != NULL);
+   LTC_ARGCHK(maclen != NULL);
+
+   if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
+      return CRYPT_MEM;
+   }
+
+   if ((err = blake2bmac_init(&st, *maclen, key, keylen)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   in = fopen(fname, "rb");
+   if (in == NULL) {
+      err = CRYPT_FILE_NOTFOUND;
+      goto LBL_ERR;
+   }
+
+   do {
+      x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
+      if ((err = blake2bmac_process(&st, buf, (unsigned long)x)) != CRYPT_OK) {
+         fclose(in);
+         goto LBL_CLEANBUF;
+      }
+   } while (x == LTC_FILE_READ_BUFSIZE);
+
+   if (fclose(in) != 0) {
+      err = CRYPT_ERROR;
+      goto LBL_CLEANBUF;
+   }
+
+   err = blake2bmac_done(&st, mac, maclen);
+
+LBL_CLEANBUF:
+   zeromem(buf, LTC_FILE_READ_BUFSIZE);
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+   zeromem(&st, sizeof(blake2bmac_state));
+#endif
+   XFREE(buf);
+   return err;
+#endif
+}
+
+#endif
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */