--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hmac_memory.c	Mon May 31 18:21:40 2004 +0000
@@ -0,0 +1,67 @@
+/* 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
+ */
+/* Submited by Dobes Vandermeer  ([email protected]) */
+
+#include "mycrypt.h"
+
+/*
+    (1) append zeros to the end of K to create a B byte string
+        (e.g., if K is of length 20 bytes and B=64, then K will be
+         appended with 44 zero bytes 0x00)
+    (2) XOR (bitwise exclusive-OR) the B byte string computed in step
+        (1) with ipad (ipad = the byte 0x36 repeated B times)
+    (3) append the stream of data 'text' to the B byte string resulting
+        from step (2)
+    (4) apply H to the stream generated in step (3)
+    (5) XOR (bitwise exclusive-OR) the B byte string computed in
+        step (1) with opad (opad = the byte 0x5C repeated B times.)
+    (6) append the H result from step (4) to the B byte string
+        resulting from step (5)
+    (7) apply H to the stream generated in step (6) and output
+        the result
+*/
+
+#ifdef HMAC
+
+#define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
+
+int hmac_memory(int hash, const unsigned char *key, unsigned long keylen,
+                const unsigned char *data, unsigned long len, 
+                unsigned char *dst, unsigned long *dstlen)
+{
+    hmac_state hmac;
+    int err;
+
+    _ARGCHK(key    != NULL);
+    _ARGCHK(data   != NULL);
+    _ARGCHK(dst    != NULL); 
+    _ARGCHK(dstlen != NULL);
+    
+    if((err = hash_is_valid(hash)) != CRYPT_OK) {
+        return err;
+    }
+
+    if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
+        return err;
+    }
+
+    if ((err = hmac_process(&hmac, data, len)) != CRYPT_OK) {
+       return err;
+    }
+
+    if ((err = hmac_done(&hmac, dst, dstlen)) != CRYPT_OK) {
+       return err;
+    }
+    return CRYPT_OK;
+}
+
+#endif
+