X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/d03ab969116fe715d569304c1c474749b2f64529..80be023065ced106a4078a36371c135a60d2bd6c:/rc4.h

diff --git a/rc4.h b/rc4.h
index adaf731..ae22b4a 100644
--- a/rc4.h
+++ b/rc4.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: rc4.h,v 1.1 1999/09/03 08:41:12 mdw Exp $
+ * $Id: rc4.h,v 1.4 2004/04/08 01:36:15 mdw Exp $
  *
  * The alleged RC4 stream cipher
  *
@@ -27,14 +27,6 @@
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: rc4.h,v $
- * Revision 1.1  1999/09/03 08:41:12  mdw
- * Initial import.
- *
- */
-
 /*----- Notes on RC4 ------------------------------------------------------*
  *
  * RC4 is a stream cipher desgigned by Ron Rivest.  For a while RC4 was a
@@ -43,8 +35,8 @@
  * list.
  */
 
-#ifndef RC4_H
-#define RC4_H
+#ifndef CATACOMB_RC4_H
+#define CATACOMB_RC4_H
 
 #ifdef __cplusplus
   extern "C" {
@@ -56,6 +48,14 @@
 
 #include <mLib/bits.h>
 
+#ifndef CATACOMB_GCIPHER_H
+#  include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_GRAND_H
+#  include "grand.h"
+#endif
+
 /*----- Data structures ---------------------------------------------------*/
 
 typedef struct rc4_ctx {
@@ -117,6 +117,21 @@ typedef struct rc4_ctx {
 
 /*----- Functions provided ------------------------------------------------*/
 
+/* --- @rc4_addkey@ --- *
+ *
+ * Arguments:	@rc4_ctx *ctx@ = pointer to context to key
+ *		@const void *k@ = pointer to key data to use
+ *		@size_t sz@ = size of the key data
+ *
+ * Returns:	---
+ *
+ * Use:		Mixes key data with an RC4 context.  The RC4 context is not
+ *		reset before mixing.  This may be used to mix new key
+ *		material with an existing RC4 context.
+ */
+
+extern void rc4_addkey(rc4_ctx */*ctx*/, const void */*k*/, size_t /*sz*/);
+
 /* --- @rc4_init@ --- *
  *
  * Arguments:	@rc4_ctx *ctx@ = pointer to context to initialize
@@ -151,6 +166,28 @@ extern void rc4_encrypt(rc4_ctx */*ctx*/,
 			const void */*src*/, void */*dest*/,
 			size_t /*sz*/);
 
+/*----- Generic cipher interface ------------------------------------------*/
+
+#define RC4_KEYSZ 16
+extern const octet rc4_keysz[];
+
+extern const gccipher rc4;
+
+/*----- Generic random number generator interface -------------------------*/
+
+/* --- @rc4_rand@ --- *
+ *
+ * Arguments:	@const void *k@ = pointer to key material
+ *		@size_t sz@ = size of key material
+ *
+ * Returns:	Pointer to generic random number generator interface.
+ *
+ * Use:		Creates a random number interface wrapper around an
+ *		OFB-mode block cipher.
+ */
+
+extern grand *rc4_rand(const void */*k*/, size_t /*sz*/);
+
 /*----- That's all, folks -------------------------------------------------*/
 
 #ifdef __cplusplus