diff options
| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2020-03-19 09:12:32 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-03-30 11:50:50 +1100 |
| commit | 358ba762d9f1d4ba99ab31ef12bc28014b22f4c9 (patch) | |
| tree | 0936b8c327d7c7c465cd19424908376eee572b68 /drivers/crypto/caam/caamrng.c | |
| parent | 0544cb75bd7df357c1758b760ecc7709125c139a (diff) | |
| download | linux-358ba762d9f1d4ba99ab31ef12bc28014b22f4c9.tar.bz2 | |
crypto: caam - enable prediction resistance in HRWNG
Instantiate CAAM RNG with prediction resistance enabled to improve its
quality (with PR on DRNG is forced to reseed from TRNG every time
random data is generated).
Management Complex firmware with version lower than 10.20.0
doesn't provide prediction resistance support. Consider this
and only instantiate rng when mc f/w version is lower.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Andrei Botila <andrei.botila@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Horia Geantă <horia.geanta@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Iuliana Prodan <iuliana.prodan@nxp.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-imx@nxp.com
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/caam/caamrng.c')
| -rw-r--r-- | drivers/crypto/caam/caamrng.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c index d0027d31e840..988bfddbadc6 100644 --- a/drivers/crypto/caam/caamrng.c +++ b/drivers/crypto/caam/caamrng.c @@ -69,7 +69,8 @@ static u32 *caam_init_desc(u32 *desc, dma_addr_t dst_dma, int len) { init_job_desc(desc, 0); /* + 1 cmd_sz */ /* Generate random bytes: + 1 cmd_sz */ - append_operation(desc, OP_ALG_ALGSEL_RNG | OP_TYPE_CLASS1_ALG); + append_operation(desc, OP_ALG_ALGSEL_RNG | OP_TYPE_CLASS1_ALG | + OP_ALG_PR_ON); /* Store bytes: + 1 cmd_sz + caam_ptr_sz */ append_fifo_store(desc, dst_dma, len, FIFOST_TYPE_RNGSTORE); |