Import original source of CryptX 0.048

1 files changed, 46 insertions, 0 deletions

diff --git a/src/ltc/modes/cbc/cbc_getiv.c b/src/ltc/modes/cbc/cbc_getiv.c
new file mode 100644
index 00000000..65877434
--- /dev/null
+++ b/src/ltc/modes/cbc/cbc_getiv.c
@@ -0,0 +1,46 @@
+/* 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, tomstdenis@gmail.com, http://libtom.org
+ */
+#include "tomcrypt.h"
+
+/**
+   @file cbc_getiv.c
+   CBC implementation, get IV, Tom St Denis
+*/
+
+#ifdef LTC_CBC_MODE
+
+/**
+   Get the current initial vector
+   @param IV   [out] The destination of the initial vector
+   @param len  [in/out]  The max size and resulting size of the initial vector
+   @param cbc  The CBC state
+   @return CRYPT_OK if successful
+*/
+int cbc_getiv(unsigned char *IV, unsigned long *len, symmetric_CBC *cbc)
+{
+   LTC_ARGCHK(IV  != NULL);
+   LTC_ARGCHK(len != NULL);
+   LTC_ARGCHK(cbc != NULL);
+   if ((unsigned long)cbc->blocklen > *len) {
+      *len = cbc->blocklen;
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+   XMEMCPY(IV, cbc->IV, cbc->blocklen);
+   *len = cbc->blocklen;
+
+   return CRYPT_OK;
+}
+
+#endif
+
+/* $Source$ */
+/* $Revision$ */
+/* $Date$ */