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crypto: caam - add a test for the RNG

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CAAM includes a Random Number Generator.  This change adds
a kernel configuration option to test the RNG's capabilities via the
hw_random framework.

Signed-off-by: Victoria Milhoan <vicki.milhoan@freescale.com>
Signed-off-by: Dan Douglass <dan.douglass@nxp.com>
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Reviewed-by: Gaurav Jain <gaurav.jain@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Victoria Milhoan (b42089) 2023-06-12 10:28:42 +02:00 committed by Herbert Xu
parent ef492d0803
commit 2be0d806e2
2 changed files with 57 additions and 0 deletions
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9
drivers/crypto/caam/Kconfig
View File

@ -162,6 +162,15 @@ config CRYPTO_DEV_FSL_CAAM_PRNG_API
config CRYPTO_DEV_FSL_CAAM_BLOB_GEN
bool
config CRYPTO_DEV_FSL_CAAM_RNG_TEST
bool "Test caam rng"
select CRYPTO_DEV_FSL_CAAM_RNG_API
help
Selecting this will enable a self-test to run for the
caam RNG.
This test is several minutes long and executes
just before the RNG is registered with the hw_random API.
endif # CRYPTO_DEV_FSL_CAAM_JR
endif # CRYPTO_DEV_FSL_CAAM

48
drivers/crypto/caam/caamrng.c
View File

@ -172,6 +172,50 @@ static void caam_cleanup(struct hwrng *rng)
kfifo_free(&ctx->fifo);
}
#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_TEST
static inline void test_len(struct hwrng *rng, size_t len, bool wait)
{
u8 *buf;
int read_len;
struct caam_rng_ctx *ctx = to_caam_rng_ctx(rng);
struct device *dev = ctx->ctrldev;
buf = kcalloc(CAAM_RNG_MAX_FIFO_STORE_SIZE, sizeof(u8), GFP_KERNEL);
while (len > 0) {
read_len = rng->read(rng, buf, len, wait);
if (read_len < 0 || (read_len == 0 && wait)) {
dev_err(dev, "RNG Read FAILED received %d bytes\n",
read_len);
kfree(buf);
return;
}
print_hex_dump_debug("random bytes@: ",
DUMP_PREFIX_ADDRESS, 16, 4,
buf, read_len, 1);
len = len - read_len;
}
kfree(buf);
}
static inline void test_mode_once(struct hwrng *rng, bool wait)
{
test_len(rng, 32, wait);
test_len(rng, 64, wait);
test_len(rng, 128, wait);
}
static void self_test(struct hwrng *rng)
{
pr_info("Executing RNG SELF-TEST with wait\n");
test_mode_once(rng, true);
}
#endif
static int caam_init(struct hwrng *rng)
{
struct caam_rng_ctx *ctx = to_caam_rng_ctx(rng);
@ -258,6 +302,10 @@ int caam_rng_init(struct device *ctrldev)
return ret;
}
#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_TEST
self_test(&ctx->rng);
#endif
devres_close_group(ctrldev, caam_rng_init);
return 0;
}