target/linux/apm821xx/patches-4.14/022-0006-crypto-crypto4xx-properly-set-IV-after-de-and-encryp.patch

   1 From fc340115ffb8235c1bbd200c28855e6373d0dd1a Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Thu, 19 Apr 2018 18:41:55 +0200
   4 Subject: [PATCH 6/8] crypto: crypto4xx - properly set IV after de- and encrypt
   5
   6 This patch fixes cts(cbc(aes)) test when cbc-aes-ppc4xx is used.
   7 alg: skcipher: Test 1 failed (invalid result) on encryption for cts(cbc-aes-ppc4xx)
   8 00000000: 4b 10 75 fc 2f 14 1b 6a 27 35 37 33 d1 b7 70 05
   9 00000010: 97
  10 alg: skcipher: Failed to load transform for cts(cbc(aes)): -2
  11
  12 The CTS cipher mode expect the IV (req->iv) of skcipher_request
  13 to contain the last ciphertext block after the {en,de}crypt
  14 operation is complete.
  15
  16 Fix this issue for the AMCC Crypto4xx hardware engine.
  17 The tcrypt test case for cts(cbc(aes)) is now correctly passed.
  18
  19 name         : cts(cbc(aes))
  20 driver       : cts(cbc-aes-ppc4xx)
  21 module       : cts
  22 priority     : 300
  23 refcnt       : 1
  24 selftest     : passed
  25 internal     : no
  26 type         : skcipher
  27 async        : yes
  28 blocksize    : 16
  29 min keysize  : 16
  30 max keysize  : 32
  31 ivsize       : 16
  32 chunksize    : 16
  33 walksize     : 16
  34
  35 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
  36 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  37 ---
  38  drivers/crypto/amcc/crypto4xx_alg.c  | 3 ++-
  39  drivers/crypto/amcc/crypto4xx_core.c | 9 +++++++++
  40  2 files changed, 11 insertions(+), 1 deletion(-)
  41
  42 --- a/drivers/crypto/amcc/crypto4xx_alg.c
  43 +++ b/drivers/crypto/amcc/crypto4xx_alg.c
  44 @@ -141,7 +141,8 @@ static int crypto4xx_setkey_aes(struct c
  45         /* Setup SA */
  46         sa = ctx->sa_in;
  47
  48 -       set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
  49 +       set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_CBC ?
  50 +                                SA_SAVE_IV : SA_NOT_SAVE_IV),
  51                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
  52                                  SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
  53                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
  54 --- a/drivers/crypto/amcc/crypto4xx_core.c
  55 +++ b/drivers/crypto/amcc/crypto4xx_core.c
  56 @@ -545,6 +545,15 @@ static void crypto4xx_cipher_done(struct
  57                 addr = dma_map_page(dev->core_dev->device, sg_page(dst),
  58                                     dst->offset, dst->length, DMA_FROM_DEVICE);
  59         }
  60 +
  61 +       if (pd_uinfo->sa_va->sa_command_0.bf.save_iv == SA_SAVE_IV) {
  62 +               struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
  63 +
  64 +               crypto4xx_memcpy_from_le32((u32 *)req->iv,
  65 +                       pd_uinfo->sr_va->save_iv,
  66 +                       crypto_skcipher_ivsize(skcipher));
  67 +       }
  68 +
  69         crypto4xx_ret_sg_desc(dev, pd_uinfo);
  70
  71         if (pd_uinfo->state & PD_ENTRY_BUSY)