--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/omac_file.c	Mon May 31 18:25:41 2004 +0000
@@ -0,0 +1,65 @@
+/* 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
+ */
+/* OMAC1 Support by Tom St Denis (for 64 and 128 bit block ciphers only) */
+#include "mycrypt.h"
+
+#ifdef OMAC
+
+int omac_file(int cipher, 
+              const unsigned char *key, unsigned long keylen,
+              const char *filename, 
+                    unsigned char *out, unsigned long *outlen)
+{
+#ifdef NO_FILE
+   return CRYPT_NOP;
+#else
+   int err, x;
+   omac_state omac;
+   FILE *in;
+   unsigned char buf[512];
+
+   _ARGCHK(key      != NULL);
+   _ARGCHK(filename != NULL);
+   _ARGCHK(out      != NULL);
+   _ARGCHK(outlen   != NULL);
+
+   in = fopen(filename, "rb");
+   if (in == NULL) {
+      return CRYPT_FILE_NOTFOUND;
+   }
+
+   if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
+      fclose(in);
+      return err;
+   }
+
+   do {
+      x = fread(buf, 1, sizeof(buf), in);
+      if ((err = omac_process(&omac, buf, x)) != CRYPT_OK) {
+         fclose(in);
+         return err;
+      }
+   } while (x == sizeof(buf));
+   fclose(in);
+
+   if ((err = omac_done(&omac, out, outlen)) != CRYPT_OK) {
+      return err;
+   }
+
+#ifdef CLEAN_STACK
+   zeromem(buf, sizeof(buf));
+#endif
+
+   return CRYPT_OK;
+#endif
+}
+
+#endif