--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/mac/hmac/hmac_memory_multi.c	Fri May 06 13:23:02 2005 +0000
@@ -0,0 +1,88 @@
+/* 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"
+#include <stdarg.h>
+
+/**
+  @file hmac_memory_multi.c
+  HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer
+*/
+
+#ifdef HMAC
+
+/**
+   HMAC multiple blocks of memory to produce the authentication tag
+   @param hash      The index of the hash to use 
+   @param key       The secret key 
+   @param keylen    The length of the secret key (octets)
+   @param out       [out] Destination of the authentication tag
+   @param outlen    [in/out] Max size and resulting size of authentication tag
+   @param in        The data to HMAC
+   @param inlen     The length of the data to HMAC (octets)
+   @param ...       tuples of (data,len) pairs to HMAC, terminated with a (NULL,x) (x=don't care)
+   @return CRYPT_OK if successful
+*/
+int hmac_memory_multi(int hash, 
+                const unsigned char *key,  unsigned long keylen,
+                      unsigned char *out,  unsigned long *outlen,
+                const unsigned char *in,   unsigned long inlen, ...)
+
+{
+    hmac_state          *hmac;
+    int                  err;
+    va_list              args;
+    const unsigned char *curptr;
+    unsigned long        curlen;
+
+    LTC_ARGCHK(key    != NULL);
+    LTC_ARGCHK(in     != NULL);
+    LTC_ARGCHK(out    != NULL); 
+    LTC_ARGCHK(outlen != NULL);
+
+    /* allocate ram for hmac state */
+    hmac = XMALLOC(sizeof(hmac_state));
+    if (hmac == NULL) {
+       return CRYPT_MEM;
+    }
+
+    if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+
+    va_start(args, inlen);
+    curptr = in; 
+    curlen = inlen;
+    for (;;) {
+       /* process buf */
+       if ((err = hmac_process(hmac, curptr, curlen)) != CRYPT_OK) {
+          goto LBL_ERR;
+       }
+       /* step to next */
+       curptr = va_arg(args, const unsigned char*);
+       if (curptr == NULL) {
+          break;
+       }
+       curlen = va_arg(args, unsigned long);
+    }
+    if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
+       goto LBL_ERR;
+    }
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+   zeromem(hmac, sizeof(hmac_state));
+#endif
+   XFREE(hmac);
+   va_end(args);
+   return err;   
+}
+
+#endif
+