Re: [rc4-amd64] RC4 optimized for AMD64

[Marc Bevand]

On 2004-11-01, James Morris <jmorris@xxxxxxxxxx> wrote:
| 
|  Only problem is that the setkey code is released under a GPL incompatible
|  license.  Although it's probably not difficult to make the kernel's
|  existing C setkey code to work with the new asm code.

Yes, it would be very easy to do. This patch (completetly untested)
is probably all that is necessary to make Linux arc4_set_key() work
with rc4-amd64:

--- 8< -----------------------------------------------------------------
--- crypto/arc4.c.orig  2004-11-01 13:16:41.739375512 +0100
+++ crypto/arc4.c       2004-11-01 13:18:16.799924112 +0100
@@ -20,8 +20,8 @@
 #define ARC4_BLOCK_SIZE                1
 
 struct arc4_ctx {
-       u8 S[256];
-       u8 x, y;
+       u64 x, y;
+       u64 S[256];
 };
 
 static int arc4_set_key(void *ctx_arg, const u8 *in_key, unsigned int key_len, u32 *flags)
--- 8< -----------------------------------------------------------------

-- 
Marc Bevand                          http://www.epita.fr/~bevand_m
Computer Science School EPITA - System, Network and Security Dept.

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