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sunxi: backport support for Allwinner Security System PRNG
Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>
This commit is contained in:
Lucian Cristian
Hauke Mehrtens
parent
1cec4d4ef0
commit
b4fefe7b6e
@ -1,4 +1,5 @@
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CONFIG_DWMAC_SUN8I=y
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CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG=y
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# CONFIG_MACH_SUN4I is not set
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# CONFIG_MACH_SUN5I is not set
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# CONFIG_PINCTRL_GR8 is not set
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@ -1,6 +1,7 @@
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# CONFIG_ARCH_PHYS_ADDR_T_64BIT is not set
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# CONFIG_ARM_ERRATA_643719 is not set
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# CONFIG_ARM_LPAE is not set
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CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG=y
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# CONFIG_MACH_SUN6I is not set
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# CONFIG_MACH_SUN7I is not set
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# CONFIG_MACH_SUN8I is not set
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@ -0,0 +1,206 @@
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From b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 Mon Sep 17 00:00:00 2001
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From: Corentin LABBE <clabbe.montjoie@gmail.com>
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Date: Mon, 3 Jul 2017 20:48:48 +0200
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Subject: crypto: sun4i-ss - support the Security System PRNG
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The Security System has a PRNG, this patch adds support for it via
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crypto_rng.
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Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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---
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drivers/crypto/Kconfig | 8 +++++
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drivers/crypto/sunxi-ss/Makefile | 1 +
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drivers/crypto/sunxi-ss/sun4i-ss-core.c | 30 ++++++++++++++++++
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drivers/crypto/sunxi-ss/sun4i-ss-prng.c | 56 +++++++++++++++++++++++++++++++++
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drivers/crypto/sunxi-ss/sun4i-ss.h | 11 +++++++
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5 files changed, 106 insertions(+)
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create mode 100644 drivers/crypto/sunxi-ss/sun4i-ss-prng.c
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--- a/drivers/crypto/Kconfig
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+++ b/drivers/crypto/Kconfig
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@@ -538,6 +538,14 @@ config CRYPTO_DEV_SUN4I_SS
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To compile this driver as a module, choose M here: the module
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will be called sun4i-ss.
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+config CRYPTO_DEV_SUN4I_SS_PRNG
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+ bool "Support for Allwinner Security System PRNG"
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+ depends on CRYPTO_DEV_SUN4I_SS
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+ select CRYPTO_RNG
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+ help
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+ Select this option if you want to provide kernel-side support for
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+ the Pseudo-Random Number Generator found in the Security System.
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+
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config CRYPTO_DEV_ROCKCHIP
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tristate "Rockchip's Cryptographic Engine driver"
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depends on OF && ARCH_ROCKCHIP
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--- a/drivers/crypto/sunxi-ss/Makefile
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+++ b/drivers/crypto/sunxi-ss/Makefile
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@@ -1,2 +1,3 @@
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obj-$(CONFIG_CRYPTO_DEV_SUN4I_SS) += sun4i-ss.o
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sun4i-ss-y += sun4i-ss-core.o sun4i-ss-hash.o sun4i-ss-cipher.o
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+sun4i-ss-$(CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG) += sun4i-ss-prng.o
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--- a/drivers/crypto/sunxi-ss/sun4i-ss-core.c
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+++ b/drivers/crypto/sunxi-ss/sun4i-ss-core.c
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@@ -214,6 +214,23 @@ static struct sun4i_ss_alg_template ss_a
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}
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}
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},
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+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
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+{
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+ .type = CRYPTO_ALG_TYPE_RNG,
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+ .alg.rng = {
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+ .base = {
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+ .cra_name = "stdrng",
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+ .cra_driver_name = "sun4i_ss_rng",
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+ .cra_priority = 300,
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+ .cra_ctxsize = 0,
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+ .cra_module = THIS_MODULE,
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+ },
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+ .generate = sun4i_ss_prng_generate,
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+ .seed = sun4i_ss_prng_seed,
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+ .seedsize = SS_SEED_LEN / BITS_PER_BYTE,
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+ }
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+},
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+#endif
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};
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static int sun4i_ss_probe(struct platform_device *pdev)
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@@ -356,6 +373,13 @@ static int sun4i_ss_probe(struct platfor
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goto error_alg;
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}
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break;
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+ case CRYPTO_ALG_TYPE_RNG:
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+ err = crypto_register_rng(&ss_algs[i].alg.rng);
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+ if (err) {
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+ dev_err(ss->dev, "Fail to register %s\n",
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+ ss_algs[i].alg.rng.base.cra_name);
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+ }
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+ break;
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}
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}
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platform_set_drvdata(pdev, ss);
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@@ -370,6 +394,9 @@ error_alg:
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case CRYPTO_ALG_TYPE_AHASH:
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crypto_unregister_ahash(&ss_algs[i].alg.hash);
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break;
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+ case CRYPTO_ALG_TYPE_RNG:
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+ crypto_unregister_rng(&ss_algs[i].alg.rng);
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+ break;
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}
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}
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if (ss->reset)
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@@ -394,6 +421,9 @@ static int sun4i_ss_remove(struct platfo
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case CRYPTO_ALG_TYPE_AHASH:
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crypto_unregister_ahash(&ss_algs[i].alg.hash);
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break;
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+ case CRYPTO_ALG_TYPE_RNG:
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+ crypto_unregister_rng(&ss_algs[i].alg.rng);
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+ break;
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}
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}
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--- /dev/null
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+++ b/drivers/crypto/sunxi-ss/sun4i-ss-prng.c
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@@ -0,0 +1,56 @@
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+#include "sun4i-ss.h"
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+
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+int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed,
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+ unsigned int slen)
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+{
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+ struct sun4i_ss_alg_template *algt;
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+ struct rng_alg *alg = crypto_rng_alg(tfm);
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+
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+ algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);
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+ memcpy(algt->ss->seed, seed, slen);
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+
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+ return 0;
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+}
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+
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+int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
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+ unsigned int slen, u8 *dst, unsigned int dlen)
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+{
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+ struct sun4i_ss_alg_template *algt;
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+ struct rng_alg *alg = crypto_rng_alg(tfm);
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+ int i;
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+ u32 v;
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+ u32 *data = (u32 *)dst;
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+ const u32 mode = SS_OP_PRNG | SS_PRNG_CONTINUE | SS_ENABLED;
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+ size_t len;
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+ struct sun4i_ss_ctx *ss;
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+ unsigned int todo = (dlen / 4) * 4;
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+
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+ algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);
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+ ss = algt->ss;
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+
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+ spin_lock(&ss->slock);
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+
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+ writel(mode, ss->base + SS_CTL);
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+
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+ while (todo > 0) {
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+ /* write the seed */
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+ for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++)
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+ writel(ss->seed[i], ss->base + SS_KEY0 + i * 4);
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+
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+ /* Read the random data */
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+ len = min_t(size_t, SS_DATA_LEN / BITS_PER_BYTE, todo);
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+ readsl(ss->base + SS_TXFIFO, data, len / 4);
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+ data += len / 4;
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+ todo -= len;
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+
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+ /* Update the seed */
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+ for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) {
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+ v = readl(ss->base + SS_KEY0 + i * 4);
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+ ss->seed[i] = v;
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+ }
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+ }
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+
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+ writel(0, ss->base + SS_CTL);
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+ spin_unlock(&ss->slock);
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+ return dlen;
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+}
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--- a/drivers/crypto/sunxi-ss/sun4i-ss.h
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+++ b/drivers/crypto/sunxi-ss/sun4i-ss.h
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@@ -30,6 +30,7 @@
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#include <crypto/aes.h>
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#include <crypto/des.h>
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#include <crypto/internal/rng.h>
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+#include <crypto/rng.h>
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#define SS_CTL 0x00
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#define SS_KEY0 0x04
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@@ -125,6 +126,9 @@
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#define SS_RXFIFO_EMP_INT_ENABLE (1 << 2)
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#define SS_TXFIFO_AVA_INT_ENABLE (1 << 0)
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+#define SS_SEED_LEN 192
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+#define SS_DATA_LEN 160
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+
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struct sun4i_ss_ctx {
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void __iomem *base;
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int irq;
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@@ -134,6 +138,9 @@ struct sun4i_ss_ctx {
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struct device *dev;
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struct resource *res;
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spinlock_t slock; /* control the use of the device */
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+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
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+ u32 seed[SS_SEED_LEN / BITS_PER_LONG];
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+#endif
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};
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struct sun4i_ss_alg_template {
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@@ -142,6 +149,7 @@ struct sun4i_ss_alg_template {
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union {
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struct crypto_alg crypto;
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struct ahash_alg hash;
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+ struct rng_alg rng;
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} alg;
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struct sun4i_ss_ctx *ss;
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};
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@@ -199,3 +207,6 @@ int sun4i_ss_des_setkey(struct crypto_ab
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unsigned int keylen);
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int sun4i_ss_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int keylen);
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+int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
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+ unsigned int slen, u8 *dst, unsigned int dlen);
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+int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
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