git.openwrt.org Git - openwrt/staging/pepe2k.git/blob

   1 From 387a26c56933fbfd0fa211ad5347d48d08695ea0 Mon Sep 17 00:00:00 2001
   2 From: "Victoria Milhoan (b42089)" <vicki.milhoan@freescale.com>
   3 Date: Fri, 17 Oct 2014 16:30:56 -0700
   4 Subject: [PATCH] MLK-9769-8 crypto: caam - add a test for the RNG
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Freescale's CAAM includes a Random Number Generator.  This change adds
  10 a kernel configuration option to test the RNG's capabilities via the
  11 hw_random framework.
  12
  13 Signed-off-by: Victoria Milhoan <vicki.milhoan@freescale.com>
  14 Signed-off-by: Dan Douglass <dan.douglass@freescale.com>
  15 Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
  16 (cherry picked from commit 05fba1bb857d5329fdcf79e736643fce0944a86d)
  17
  18 -fixed compilation warning:
  19 drivers/crypto/caam/caamrng.c:271:2: warning: format '%d' expects argument of type 'int', but argument 2 has type 'size_t' [-Wformat=]
  20
  21 -changed commit headline
  22
  23 Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
  24 ---
  25  drivers/crypto/caam/Kconfig   |  8 ++++++++
  26  drivers/crypto/caam/caamrng.c | 47 +++++++++++++++++++++++++++++++++++++++++++
  27  2 files changed, 55 insertions(+)
  28
  29 --- a/drivers/crypto/caam/Kconfig
  30 +++ b/drivers/crypto/caam/Kconfig
  31 @@ -148,6 +148,14 @@ config CRYPTO_DEV_FSL_CAAM_RNG_API
  32           Selecting this will register the SEC4 hardware rng to
  33           the hw_random API for suppying the kernel entropy pool.
  34
  35 +config CRYPTO_DEV_FSL_CAAM_RNG_TEST
  36 +       bool "Test caam rng"
  37 +       depends on CRYPTO_DEV_FSL_CAAM_RNG_API
  38 +       help
  39 +         Selecting this will enable a self-test to run for the
  40 +         caam RNG. This test is several minutes long and executes
  41 +         just before the RNG is registered with the hw_random API.
  42 +
  43  endif # CRYPTO_DEV_FSL_CAAM_JR
  44
  45  endif # CRYPTO_DEV_FSL_CAAM
  46 --- a/drivers/crypto/caam/caamrng.c
  47 +++ b/drivers/crypto/caam/caamrng.c
  48 @@ -258,6 +258,49 @@ static void caam_cleanup(struct hwrng *r
  49         rng_unmap_ctx(rng_ctx);
  50  }
  51
  52 +#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_TEST
  53 +static inline void test_len(struct hwrng *rng, size_t len, bool wait)
  54 +{
  55 +       u8 *buf;
  56 +       int real_len;
  57 +
  58 +       buf = kzalloc(sizeof(u8) * len, GFP_KERNEL);
  59 +       real_len = rng->read(rng, buf, len, wait);
  60 +       if (real_len == 0 && wait)
  61 +               pr_err("WAITING FAILED\n");
  62 +       pr_info("wanted %zu bytes, got %d\n", len, real_len);
  63 +       print_hex_dump(KERN_INFO, "random bytes@: ", DUMP_PREFIX_ADDRESS,
  64 +                      16, 4, buf, real_len, 1);
  65 +       kfree(buf);
  66 +}
  67 +
  68 +static inline void test_mode_once(struct hwrng *rng, bool wait)
  69 +{
  70 +#define TEST_CHUNK (RN_BUF_SIZE / 4)
  71 +
  72 +       test_len(rng, TEST_CHUNK, wait);
  73 +       test_len(rng, RN_BUF_SIZE * 2, wait);
  74 +       test_len(rng, RN_BUF_SIZE * 2 - TEST_CHUNK, wait);
  75 +}
  76 +
  77 +static inline void test_mode(struct hwrng *rng, bool wait)
  78 +{
  79 +#define TEST_PASS 1
  80 +       int i;
  81 +
  82 +       for (i = 0; i < TEST_PASS; i++)
  83 +               test_mode_once(rng, wait);
  84 +}
  85 +
  86 +static void self_test(struct hwrng *rng)
  87 +{
  88 +       pr_info("testing without waiting\n");
  89 +       test_mode(rng, false);
  90 +       pr_info("testing with waiting\n");
  91 +       test_mode(rng, true);
  92 +}
  93 +#endif
  94 +
  95  static int caam_init_buf(struct caam_rng_ctx *ctx, int buf_id)
  96  {
  97         struct buf_data *bd = &ctx->bufs[buf_id];
  98 @@ -342,6 +385,10 @@ int caam_rng_init(struct device *ctrldev
  99         if (err)
 100                 goto free_rng_ctx;
 101
 102 +#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_TEST
 103 +       self_test(&caam_rng);
 104 +#endif
 105 +
 106         dev_info(dev, "registering rng-caam\n");
 107
 108         err = hwrng_register(&caam_rng);