--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/mac/pmac/pmac_file.c	Fri May 06 13:23:02 2005 +0000
@@ -0,0 +1,80 @@
+/* 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
+ */
+#include "tomcrypt.h"
+
+/** 
+   @file pmac_file.c
+   PMAC implementation, process a file, by Tom St Denis 
+*/
+
+#ifdef PMAC
+
+/**
+   PMAC a file 
+   @param cipher       The index of the cipher desired
+   @param key          The secret key
+   @param keylen       The length of the secret key (octets)
+   @param filename     The name of the file to send through PMAC
+   @param out          [out] Destination for the authentication tag
+   @param outlen       [in/out] Max size and resulting size of the authentication tag
+   @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
+*/
+int pmac_file(int cipher, 
+              const unsigned char *key, unsigned long keylen,
+              const char *filename, 
+                    unsigned char *out, unsigned long *outlen)
+{
+#ifdef LTC_NO_FILE
+   return CRYPT_NOP;
+#else
+   int err, x;
+   pmac_state pmac;
+   FILE *in;
+   unsigned char buf[512];
+
+
+   LTC_ARGCHK(key      != NULL);
+   LTC_ARGCHK(filename != NULL);
+   LTC_ARGCHK(out      != NULL);
+   LTC_ARGCHK(outlen   != NULL);
+
+   in = fopen(filename, "rb");
+   if (in == NULL) {
+      return CRYPT_FILE_NOTFOUND;
+   }
+
+   if ((err = pmac_init(&pmac, cipher, key, keylen)) != CRYPT_OK) {
+      fclose(in);
+      return err;
+   }
+
+   do {
+      x = fread(buf, 1, sizeof(buf), in);
+      if ((err = pmac_process(&pmac, buf, x)) != CRYPT_OK) {
+         fclose(in);
+         return err;
+      }
+   } while (x == sizeof(buf));
+   fclose(in);
+
+   if ((err = pmac_done(&pmac, out, outlen)) != CRYPT_OK) {
+      return err;
+   }
+
+#ifdef LTC_CLEAN_STACK
+   zeromem(buf, sizeof(buf));
+#endif
+
+   return CRYPT_OK;
+#endif
+}
+
+#endif