On Mon, Apr 05, 2010 at 07:04:06PM +0200, Sebastian Andrzej Siewior wrote:
>
> +static void arc4_key_to_iv(const u8 *in_key, u32 key_len, struct arc4_iv *iv)
> +{
> + int i, j = 0, k = 0;
> +
> + iv->iv.x = 1;
> + iv->iv.y = 0;
> +
> + for (i = 0; i < 256; i++)
> + iv->iv.S[i] = i;
> +
> + for (i = 0; i < 256; i++)
> + {
> + u8 a = iv->iv.S[i];
> + j = (j + in_key[k] + a) & 0xff;
> + iv->iv.S[i] = iv->iv.S[j];
> + iv->iv.S[j] = a;
> + if (++k >= key_len)
> + k = 0;
> + }
> +}
> +
> +static void arc4_ivsetup(struct arc4_iv *iv)
> +{
> + struct arc4_iv tmp_iv;
> +
> + if (iv->type == ARC4_TYPE_IV)
> + return;
> +
> + memcpy(&tmp_iv, iv, sizeof(tmp_iv));
> + arc4_key_to_iv(tmp_iv.key.key, tmp_iv.key.key_len, iv);
> + iv->type = ARC4_TYPE_IV;
> +}
We need to verify that 1 <= key_len <= 256.
Cheers,
--
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