+++ /dev/null
-From d072bfa4885354fff86aa1fb1dbc4f1533c9e0bf Mon Sep 17 00:00:00 2001
-From: Christian Lamparter <chunkeey@gmail.com>
-Date: Sun, 23 Dec 2018 02:16:13 +0100
-Subject: [PATCH 06/15] crypto: crypto4xx - add prng crypto support
-
-This patch adds support for crypto4xx's ANSI X9.17 Annex C compliant
-pseudo random number generator which provides a pseudo random source
-for the purpose of generating Initialization Vectors (IV's) for AES
-algorithms to the Packet Engine and other pseudo random number
-requirements.
-
-Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
-Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
----
- drivers/crypto/amcc/crypto4xx_core.c | 87 +++++++++++++++++++++++++
- drivers/crypto/amcc/crypto4xx_core.h | 4 ++
- drivers/crypto/amcc/crypto4xx_reg_def.h | 1 +
- 3 files changed, 92 insertions(+)
-
---- a/drivers/crypto/amcc/crypto4xx_core.c
-+++ b/drivers/crypto/amcc/crypto4xx_core.c
-@@ -40,9 +40,11 @@
- #include <crypto/ctr.h>
- #include <crypto/gcm.h>
- #include <crypto/sha.h>
-+#include <crypto/rng.h>
- #include <crypto/scatterwalk.h>
- #include <crypto/skcipher.h>
- #include <crypto/internal/aead.h>
-+#include <crypto/internal/rng.h>
- #include <crypto/internal/skcipher.h>
- #include "crypto4xx_reg_def.h"
- #include "crypto4xx_core.h"
-@@ -1042,6 +1044,10 @@ static int crypto4xx_register_alg(struct
- rc = crypto_register_ahash(&alg->alg.u.hash);
- break;
-
-+ case CRYPTO_ALG_TYPE_RNG:
-+ rc = crypto_register_rng(&alg->alg.u.rng);
-+ break;
-+
- default:
- rc = crypto_register_skcipher(&alg->alg.u.cipher);
- break;
-@@ -1071,6 +1077,10 @@ static void crypto4xx_unregister_alg(str
- crypto_unregister_aead(&alg->alg.u.aead);
- break;
-
-+ case CRYPTO_ALG_TYPE_RNG:
-+ crypto_unregister_rng(&alg->alg.u.rng);
-+ break;
-+
- default:
- crypto_unregister_skcipher(&alg->alg.u.cipher);
- }
-@@ -1129,6 +1139,69 @@ static irqreturn_t crypto4xx_ce_interrup
- PPC4XX_TMO_ERR_INT);
- }
-
-+static int ppc4xx_prng_data_read(struct crypto4xx_device *dev,
-+ u8 *data, unsigned int max)
-+{
-+ unsigned int i, curr = 0;
-+ u32 val[2];
-+
-+ do {
-+ /* trigger PRN generation */
-+ writel(PPC4XX_PRNG_CTRL_AUTO_EN,
-+ dev->ce_base + CRYPTO4XX_PRNG_CTRL);
-+
-+ for (i = 0; i < 1024; i++) {
-+ /* usually 19 iterations are enough */
-+ if ((readl(dev->ce_base + CRYPTO4XX_PRNG_STAT) &
-+ CRYPTO4XX_PRNG_STAT_BUSY))
-+ continue;
-+
-+ val[0] = readl_be(dev->ce_base + CRYPTO4XX_PRNG_RES_0);
-+ val[1] = readl_be(dev->ce_base + CRYPTO4XX_PRNG_RES_1);
-+ break;
-+ }
-+ if (i == 1024)
-+ return -ETIMEDOUT;
-+
-+ if ((max - curr) >= 8) {
-+ memcpy(data, &val, 8);
-+ data += 8;
-+ curr += 8;
-+ } else {
-+ /* copy only remaining bytes */
-+ memcpy(data, &val, max - curr);
-+ break;
-+ }
-+ } while (curr < max);
-+
-+ return curr;
-+}
-+
-+static int crypto4xx_prng_generate(struct crypto_rng *tfm,
-+ const u8 *src, unsigned int slen,
-+ u8 *dstn, unsigned int dlen)
-+{
-+ struct rng_alg *alg = crypto_rng_alg(tfm);
-+ struct crypto4xx_alg *amcc_alg;
-+ struct crypto4xx_device *dev;
-+ int ret;
-+
-+ amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.rng);
-+ dev = amcc_alg->dev;
-+
-+ mutex_lock(&dev->core_dev->rng_lock);
-+ ret = ppc4xx_prng_data_read(dev, dstn, dlen);
-+ mutex_unlock(&dev->core_dev->rng_lock);
-+ return ret;
-+}
-+
-+
-+static int crypto4xx_prng_seed(struct crypto_rng *tfm, const u8 *seed,
-+ unsigned int slen)
-+{
-+ return 0;
-+}
-+
- /**
- * Supported Crypto Algorithms
- */
-@@ -1298,6 +1371,18 @@ static struct crypto4xx_alg_common crypt
- .cra_module = THIS_MODULE,
- },
- } },
-+ { .type = CRYPTO_ALG_TYPE_RNG, .u.rng = {
-+ .base = {
-+ .cra_name = "stdrng",
-+ .cra_driver_name = "crypto4xx_rng",
-+ .cra_priority = 300,
-+ .cra_ctxsize = 0,
-+ .cra_module = THIS_MODULE,
-+ },
-+ .generate = crypto4xx_prng_generate,
-+ .seed = crypto4xx_prng_seed,
-+ .seedsize = 0,
-+ } },
- };
-
- /**
-@@ -1367,6 +1452,7 @@ static int crypto4xx_probe(struct platfo
- core_dev->dev->core_dev = core_dev;
- core_dev->dev->is_revb = is_revb;
- core_dev->device = dev;
-+ mutex_init(&core_dev->rng_lock);
- spin_lock_init(&core_dev->lock);
- INIT_LIST_HEAD(&core_dev->dev->alg_list);
- ratelimit_default_init(&core_dev->dev->aead_ratelimit);
-@@ -1446,6 +1532,7 @@ static int crypto4xx_remove(struct platf
- tasklet_kill(&core_dev->tasklet);
- /* Un-register with Linux CryptoAPI */
- crypto4xx_unregister_alg(core_dev->dev);
-+ mutex_destroy(&core_dev->rng_lock);
- /* Free all allocated memory */
- crypto4xx_stop_all(core_dev);
-
---- a/drivers/crypto/amcc/crypto4xx_core.h
-+++ b/drivers/crypto/amcc/crypto4xx_core.h
-@@ -23,8 +23,10 @@
- #define __CRYPTO4XX_CORE_H__
-
- #include <linux/ratelimit.h>
-+#include <linux/mutex.h>
- #include <crypto/internal/hash.h>
- #include <crypto/internal/aead.h>
-+#include <crypto/internal/rng.h>
- #include <crypto/internal/skcipher.h>
- #include "crypto4xx_reg_def.h"
- #include "crypto4xx_sa.h"
-@@ -119,6 +121,7 @@ struct crypto4xx_core_device {
- u32 irq;
- struct tasklet_struct tasklet;
- spinlock_t lock;
-+ struct mutex rng_lock;
- };
-
- struct crypto4xx_ctx {
-@@ -143,6 +146,7 @@ struct crypto4xx_alg_common {
- struct skcipher_alg cipher;
- struct ahash_alg hash;
- struct aead_alg aead;
-+ struct rng_alg rng;
- } u;
- };
-
---- a/drivers/crypto/amcc/crypto4xx_reg_def.h
-+++ b/drivers/crypto/amcc/crypto4xx_reg_def.h
-@@ -100,6 +100,7 @@
- #define CRYPTO4XX_ENDIAN_CFG 0x000600d8
-
- #define CRYPTO4XX_PRNG_STAT 0x00070000
-+#define CRYPTO4XX_PRNG_STAT_BUSY 0x1
- #define CRYPTO4XX_PRNG_CTRL 0x00070004
- #define CRYPTO4XX_PRNG_SEED_L 0x00070008
- #define CRYPTO4XX_PRNG_SEED_H 0x0007000c
projects / openwrt / staging / wigyori.git / blobdiff