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[67.165.113.11]) by smtp.gmail.com with ESMTPSA id u23sm16368642pfm.29.2020.01.27.08.57.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jan 2020 08:57:17 -0800 (PST) From: Andrey Smirnov To: linux-crypto@vger.kernel.org Cc: Andrey Smirnov , Chris Healy , Lucas Stach , =?utf-8?q?Horia_Geant=C4=83?= , Herbert Xu , Iuliana Prodan , linux-kernel@vger.kernel.org, linux-imx@nxp.com Subject: [PATCH v7 9/9] crypto: caam - limit single JD RNG output to maximum of 16 bytes Date: Mon, 27 Jan 2020 08:56:46 -0800 Message-Id: <20200127165646.19806-10-andrew.smirnov@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200127165646.19806-1-andrew.smirnov@gmail.com> References: <20200127165646.19806-1-andrew.smirnov@gmail.com> MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org In order to follow recommendation in SP800-90C (section "9.4 The Oversampling-NRBG Construction") limit the output of "generate" JD submitted to CAAM. See https://lore.kernel.org/linux-crypto/VI1PR0402MB3485EF10976A4A69F90E5B0F98580@VI1PR0402MB3485.eurprd04.prod.outlook.com/ for more details. This change should make CAAM's hwrng driver good enough to have 1024 quality rating. Signed-off-by: Andrey Smirnov Cc: Chris Healy Cc: Lucas Stach Cc: Horia Geantă Cc: Herbert Xu Cc: Iuliana Prodan Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-imx@nxp.com --- drivers/crypto/caam/caamrng.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c index 62f3a69ae837..c0981fce68b7 100644 --- a/drivers/crypto/caam/caamrng.c +++ b/drivers/crypto/caam/caamrng.c @@ -23,9 +23,9 @@ #include "error.h" /* length of descriptors */ -#define CAAM_RNG_MAX_FIFO_STORE_SIZE U16_MAX +#define CAAM_RNG_MAX_FIFO_STORE_SIZE 16 -#define CAAM_RNG_FIFO_LEN SZ_32K /* Must be a multiple of 2 */ +#define CAAM_RNG_FIFO_LEN 64 /* Must be a multiple of 2 */ /* * See caam_init_desc() @@ -128,7 +128,7 @@ static void caam_rng_fill_async(struct caam_rng_ctx *ctx) sg_init_table(sg, ARRAY_SIZE(sg)); nents = kfifo_dma_in_prepare(&ctx->fifo, sg, ARRAY_SIZE(sg), - CAAM_RNG_FIFO_LEN); + CAAM_RNG_MAX_FIFO_STORE_SIZE); if (!nents) return; @@ -246,6 +246,7 @@ int caam_rng_init(struct device *ctrldev) ctx->rng.init = caam_init; ctx->rng.cleanup = caam_cleanup; ctx->rng.read = caam_read; + ctx->rng.quality = 1024; dev_info(ctrldev, "registering rng-caam\n");