--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/modes/cbc/cbc_start.c	Fri May 06 13:23:02 2005 +0000
@@ -0,0 +1,58 @@
+/* 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 cbc_start.c
+   CBC implementation, start chain, Tom St Denis
+*/
+
+#ifdef CBC
+
+/**
+   Initialize a CBC context
+   @param cipher      The index of the cipher desired
+   @param IV          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 cbc         The CBC state to initialize
+   @return CRYPT_OK if successful
+*/
+int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key, 
+              int keylen, int num_rounds, symmetric_CBC *cbc)
+{
+   int x, err;
+ 
+   LTC_ARGCHK(IV != NULL);
+   LTC_ARGCHK(key != NULL);
+   LTC_ARGCHK(cbc != 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, &cbc->key)) != CRYPT_OK) {
+      return err;
+   }
+
+   /* copy IV */
+   cbc->blocklen = cipher_descriptor[cipher].block_length;
+   cbc->cipher   = cipher;
+   for (x = 0; x < cbc->blocklen; x++) {
+       cbc->IV[x] = IV[x];
+   }
+   return CRYPT_OK;
+}
+
+#endif