--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/modes/ctr/ctr_start.c	Fri May 06 13:23:02 2005 +0000
@@ -0,0 +1,62 @@
+/* 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 ctr_start.c
+   CTR implementation, start chain, Tom St Denis
+*/
+
+
+#ifdef CTR
+
+/**
+   Initialize a CTR context
+   @param cipher      The index of the cipher desired
+   @param count       The initial vector
+   @param key         The secret key 
+   @param keylen      The length of the secret key (octets)
+   @param num_rounds  Number of rounds in the cipher desired (0 for default)
+   @param ctr         The CTR state to initialize
+   @return CRYPT_OK if successful
+*/
+int ctr_start(int cipher, const unsigned char *count, const unsigned char *key, int keylen, 
+              int num_rounds, symmetric_CTR *ctr)
+{
+   int x, err;
+
+   LTC_ARGCHK(count != NULL);
+   LTC_ARGCHK(key != NULL);
+   LTC_ARGCHK(ctr != NULL);
+
+   /* bad param? */
+   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* setup cipher */
+   if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* copy ctr */
+   ctr->blocklen = cipher_descriptor[cipher].block_length;
+   ctr->cipher   = cipher;
+   ctr->padlen   = 0;
+   ctr->mode     = 0;
+   for (x = 0; x < ctr->blocklen; x++) {
+       ctr->ctr[x] = count[x];
+   }
+   cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
+   return CRYPT_OK;
+}
+
+#endif