On Sun, Sep 20, 2020 at 8:37 PM Corentin Labbe clabbe@baylibre.com wrote:
Ciphers produce invalid results on BE. Key and IV need to be written in LE.
Fixes: 6298e948215f2 ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator") Cc: stable@vger.kernel.org Signed-off-by: Corentin Labbe clabbe@baylibre.com
drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c index c6c25204780d..a05889745097 100644 --- a/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c +++ b/drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c @@ -52,13 +52,13 @@ static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
spin_lock_irqsave(&ss->slock, flags);
for (i = 0; i < op->keylen; i += 4)writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
for (i = 0; i < op->keylen / 4; i++)writel(cpu_to_le32(op->key[i]), ss->base + SS_KEY0 + i * 4);
I suspect what you actually want here is writesl() in place of the loop. This skips the byteswap on big-endian, rather than swapping each word twice.
The point is that this register seems to act as a FIFO for a byte-stream rather than a 32-bit fixed-endian register.
Arnd