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[PATCH v2 00/12] crypto: atmel-authenc: add support to authenc(hmac(shaX),Y(aes)) modes

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  [PATCH v2 00/12] crypto: atmel-authenc: add support to authenc(hmac(shaX),Y(aes)) modes Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-12-22 17:40 +0100
    [PATCH v2 09/12] crypto: atmel-sha: add support to hmac(shaX) Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-12-22 17:40 +0100
    [PATCH v2 05/12] crypto: atmel-sha: add atmel_sha_wait_for_data_ready() Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-12-22 17:50 +0100
    [PATCH v2 01/12] crypto: atmel-sha: create function to get an Atmel SHA device Cyrille Pitchen <cyrille.pitchen@atmel.com> - 2016-12-22 17:50 +0100

#1546479 — [PATCH v2 00/12] crypto: atmel-authenc: add support to authenc(hmac(shaX),Y(aes)) modes

Hi all,

this series of patches has been based and tested on next-20161222 with
CRYPTO_MANAGER_DISABLED_TESTS not set.

The series adds support to the hmac(shaX) algorithms first, then combines
both the Atmel SHA and AES hardware accelerators to implement
authenc(hmac(shaX),Y(aes)) algorithms as used by IPSEC/SSL connections.

It has also been tested with strongswan + xl2tpd to create an IPSEC+L2TP
(transport mode) VPN and strongswan only (tunnel mode) for an IPSEC VPN.

Then iperf was used to measure the bandwidth improvement in tunnel mode:

drivers                                    AES SHA SPLIP iperf half-duplex
                                                         Mbit/s
authenc(hmac(sha1-generic),cbc(aes))        SW   SW  N/A 27.7
authenc(hmac(sha1-generic),atmel-cbc-aes)   HW   SW  N/A 30.2 (mainline)
authenc(atmel-hmac-sha1,atmel-cbc-aes)      HW   HW   no 29.1
atmel-authenc-hmac-sha1-cbc-aes             HW   HW  yes 38.8

SPLIP: Secure Protocol Layers Improved Performances (AES+SHA combined).

Some patches of this series are purely transitional: I've split the
modifications into many patches to ease the review.

Best regards,

Cyrille


ChangeLog:

v1 -> v2:
- add missing drivers/crypto/atmel-authenc.h file in patch 11.


Cyrille Pitchen (12):
  crypto: atmel-sha: create function to get an Atmel SHA device
  crypto: atmel-sha: update request queue management to make it more
    generic
  crypto: atmel-sha: make atmel_sha_done_task more generic
  crypto: atmel-sha: redefine SHA_FLAGS_SHA* flags to match
    SHA_MR_ALGO_SHA*
  crypto: atmel-sha: add atmel_sha_wait_for_data_ready()
  crypto: atmel-sha: add SHA_MR_MODE_IDATAR0
  crypto: atmel-sha: add atmel_sha_cpu_start()
  crypto: atmel-sha: add simple DMA transfers
  crypto: atmel-sha: add support to hmac(shaX)
  crypto: atmel-aes: fix atmel_aes_handle_queue()
  crypto: atmel-authenc: add support to authenc(hmac(shaX),Y(aes)) modes
  crypto: atmel-sha: add verbose debug facilities to print hw register
    names

 drivers/crypto/Kconfig          |   12 +
 drivers/crypto/atmel-aes-regs.h |   16 +
 drivers/crypto/atmel-aes.c      |  478 ++++++++++++-
 drivers/crypto/atmel-authenc.h  |   64 ++
 drivers/crypto/atmel-sha-regs.h |   20 +
 drivers/crypto/atmel-sha.c      | 1438 +++++++++++++++++++++++++++++++++++++--
 6 files changed, 1960 insertions(+), 68 deletions(-)
 create mode 100644 drivers/crypto/atmel-authenc.h

-- 
2.7.4

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#1546480 — [PATCH v2 09/12] crypto: atmel-sha: add support to hmac(shaX)

This patch adds support to the hmac(shaX) algorithms.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/crypto/atmel-sha-regs.h |   4 +
 drivers/crypto/atmel-sha.c      | 598 +++++++++++++++++++++++++++++++++++++++-
 2 files changed, 601 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/atmel-sha-regs.h b/drivers/crypto/atmel-sha-regs.h
index 8d62d31eda08..1b9f3d33079e 100644
--- a/drivers/crypto/atmel-sha-regs.h
+++ b/drivers/crypto/atmel-sha-regs.h
@@ -26,6 +26,7 @@
 #define SHA_MR_ALGO_SHA384		(2 << 8)
 #define SHA_MR_ALGO_SHA512		(3 << 8)
 #define SHA_MR_ALGO_SHA224		(4 << 8)
+#define SHA_MR_HMAC			(1 << 11)
 #define	SHA_MR_DUALBUFF			(1 << 16)
 
 #define SHA_IER				0x10
@@ -42,6 +43,9 @@
 #define SHA_ISR_URAT_MR			(0x2 << 12)
 #define SHA_ISR_URAT_WO			(0x5 << 12)
 
+#define SHA_MSR				0x20
+#define SHA_BCR				0x30
+
 #define	SHA_HW_VERSION		0xFC
 
 #define SHA_TPR				0x108
diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index a4fc60b67099..78c3c02e4483 100644
--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -51,13 +51,20 @@
 #define SHA_FLAGS_CPU			BIT(5)
 #define SHA_FLAGS_DMA_READY		BIT(6)
 
-/* bits[10:8] are reserved. */
+/* bits[11:8] are reserved. */
 #define SHA_FLAGS_ALGO_MASK	SHA_MR_ALGO_MASK
 #define SHA_FLAGS_SHA1		SHA_MR_ALGO_SHA1
 #define SHA_FLAGS_SHA256	SHA_MR_ALGO_SHA256
 #define SHA_FLAGS_SHA384	SHA_MR_ALGO_SHA384
 #define SHA_FLAGS_SHA512	SHA_MR_ALGO_SHA512
 #define SHA_FLAGS_SHA224	SHA_MR_ALGO_SHA224
+#define SHA_FLAGS_HMAC		SHA_MR_HMAC
+#define SHA_FLAGS_HMAC_SHA1	(SHA_FLAGS_HMAC | SHA_FLAGS_SHA1)
+#define SHA_FLAGS_HMAC_SHA256	(SHA_FLAGS_HMAC | SHA_FLAGS_SHA256)
+#define SHA_FLAGS_HMAC_SHA384	(SHA_FLAGS_HMAC | SHA_FLAGS_SHA384)
+#define SHA_FLAGS_HMAC_SHA512	(SHA_FLAGS_HMAC | SHA_FLAGS_SHA512)
+#define SHA_FLAGS_HMAC_SHA224	(SHA_FLAGS_HMAC | SHA_FLAGS_SHA224)
+#define SHA_FLAGS_MODE_MASK	(SHA_FLAGS_HMAC | SHA_FLAGS_ALGO_MASK)
 
 #define SHA_FLAGS_FINUP		BIT(16)
 #define SHA_FLAGS_SG		BIT(17)
@@ -67,8 +74,10 @@
 #define SHA_FLAGS_IDATAR0	BIT(26)
 #define SHA_FLAGS_WAIT_DATARDY	BIT(27)
 
+#define SHA_OP_INIT	0
 #define SHA_OP_UPDATE	1
 #define SHA_OP_FINAL	2
+#define SHA_OP_DIGEST	3
 
 #define SHA_BUFFER_LEN		(PAGE_SIZE / 16)
 
@@ -80,6 +89,7 @@ struct atmel_sha_caps {
 	bool	has_sha224;
 	bool	has_sha_384_512;
 	bool	has_uihv;
+	bool	has_hmac;
 };
 
 struct atmel_sha_dev;
@@ -105,6 +115,7 @@ struct atmel_sha_reqctx {
 	unsigned int	total;	/* total request */
 
 	size_t block_size;
+	size_t hash_size;
 
 	u8 buffer[SHA_BUFFER_LEN + SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
 };
@@ -152,6 +163,8 @@ struct atmel_sha_dev {
 
 	struct atmel_sha_caps	caps;
 
+	struct scatterlist	tmp;
+
 	u32	hw_version;
 };
 
@@ -1522,11 +1535,579 @@ static int atmel_sha_cpu_start(struct atmel_sha_dev *dd,
 	return atmel_sha_cpu_transfer(dd);
 }
 
+static int atmel_sha_cpu_hash(struct atmel_sha_dev *dd,
+			      const void *data, unsigned int datalen,
+			      bool auto_padding,
+			      atmel_sha_fn_t resume)
+{
+	struct ahash_request *req = dd->req;
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	u32 msglen = (auto_padding) ? datalen : 0;
+	u32 mr = SHA_MR_MODE_AUTO;
+
+	if (!(IS_ALIGNED(datalen, ctx->block_size) || auto_padding))
+		return atmel_sha_complete(dd, -EINVAL);
+
+	mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
+	atmel_sha_write(dd, SHA_MR, mr);
+	atmel_sha_write(dd, SHA_MSR, msglen);
+	atmel_sha_write(dd, SHA_BCR, msglen);
+	atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
+
+	sg_init_one(&dd->tmp, data, datalen);
+	return atmel_sha_cpu_start(dd, &dd->tmp, datalen, false, true, resume);
+}
+
+
+/* hmac functions */
+
+struct atmel_sha_hmac_key {
+	bool			valid;
+	unsigned int		keylen;
+	u8			buffer[SHA512_BLOCK_SIZE];
+	u8			*keydup;
+};
+
+static inline void atmel_sha_hmac_key_init(struct atmel_sha_hmac_key *hkey)
+{
+	memset(hkey, 0, sizeof(*hkey));
+}
+
+static inline void atmel_sha_hmac_key_release(struct atmel_sha_hmac_key *hkey)
+{
+	kfree(hkey->keydup);
+	memset(hkey, 0, sizeof(*hkey));
+}
+
+static inline int atmel_sha_hmac_key_set(struct atmel_sha_hmac_key *hkey,
+					 const u8 *key,
+					 unsigned int keylen)
+{
+	atmel_sha_hmac_key_release(hkey);
+
+	if (keylen > sizeof(hkey->buffer)) {
+		hkey->keydup = kmemdup(key, keylen, GFP_KERNEL);
+		if (!hkey->keydup)
+			return -ENOMEM;
+
+	} else {
+		memcpy(hkey->buffer, key, keylen);
+	}
+
+	hkey->valid = true;
+	hkey->keylen = keylen;
+	return 0;
+}
+
+static inline bool atmel_sha_hmac_key_get(const struct atmel_sha_hmac_key *hkey,
+					  const u8 **key,
+					  unsigned int *keylen)
+{
+	if (!hkey->valid)
+		return false;
+
+	*keylen = hkey->keylen;
+	*key = (hkey->keydup) ? hkey->keydup : hkey->buffer;
+	return true;
+}
+
+
+struct atmel_sha_hmac_ctx {
+	struct atmel_sha_ctx	base;
+
+	struct atmel_sha_hmac_key	hkey;
+	u32			ipad[SHA512_BLOCK_SIZE / sizeof(u32)];
+	u32			opad[SHA512_BLOCK_SIZE / sizeof(u32)];
+	atmel_sha_fn_t		resume;
+};
+
+static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
+				atmel_sha_fn_t resume);
+static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
+				      const u8 *key, unsigned int keylen);
+static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd);
+static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd);
+static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd);
+static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd);
+
+static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd);
+static int atmel_sha_hmac_final(struct atmel_sha_dev *dd);
+static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd);
+static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd);
+
+static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
+				atmel_sha_fn_t resume)
+{
+	struct ahash_request *req = dd->req;
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	unsigned int keylen;
+	const u8 *key;
+	size_t bs;
+
+	hmac->resume = resume;
+	switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
+	case SHA_FLAGS_SHA1:
+		ctx->block_size = SHA1_BLOCK_SIZE;
+		ctx->hash_size = SHA1_DIGEST_SIZE;
+		break;
+
+	case SHA_FLAGS_SHA224:
+		ctx->block_size = SHA224_BLOCK_SIZE;
+		ctx->hash_size = SHA256_DIGEST_SIZE;
+		break;
+
+	case SHA_FLAGS_SHA256:
+		ctx->block_size = SHA256_BLOCK_SIZE;
+		ctx->hash_size = SHA256_DIGEST_SIZE;
+		break;
+
+	case SHA_FLAGS_SHA384:
+		ctx->block_size = SHA384_BLOCK_SIZE;
+		ctx->hash_size = SHA512_DIGEST_SIZE;
+		break;
+
+	case SHA_FLAGS_SHA512:
+		ctx->block_size = SHA512_BLOCK_SIZE;
+		ctx->hash_size = SHA512_DIGEST_SIZE;
+		break;
+
+	default:
+		return atmel_sha_complete(dd, -EINVAL);
+	}
+	bs = ctx->block_size;
+
+	if (likely(!atmel_sha_hmac_key_get(&hmac->hkey, &key, &keylen)))
+		return resume(dd);
+
+	/* Compute K' from K. */
+	if (unlikely(keylen > bs))
+		return atmel_sha_hmac_prehash_key(dd, key, keylen);
+
+	/* Prepare ipad. */
+	memcpy((u8 *)hmac->ipad, key, keylen);
+	memset((u8 *)hmac->ipad + keylen, 0, bs - keylen);
+	return atmel_sha_hmac_compute_ipad_hash(dd);
+}
+
+static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
+				      const u8 *key, unsigned int keylen)
+{
+	return atmel_sha_cpu_hash(dd, key, keylen, true,
+				  atmel_sha_hmac_prehash_key_done);
+}
+
+static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	size_t ds = crypto_ahash_digestsize(tfm);
+	size_t bs = ctx->block_size;
+	size_t i, num_words = ds / sizeof(u32);
+
+	/* Prepare ipad. */
+	for (i = 0; i < num_words; ++i)
+		hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
+	memset((u8 *)hmac->ipad + ds, 0, bs - ds);
+	return atmel_sha_hmac_compute_ipad_hash(dd);
+}
+
+static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	size_t bs = ctx->block_size;
+	size_t i, num_words = bs / sizeof(u32);
+
+	memcpy(hmac->opad, hmac->ipad, bs);
+	for (i = 0; i < num_words; ++i) {
+		hmac->ipad[i] ^= 0x36363636;
+		hmac->opad[i] ^= 0x5c5c5c5c;
+	}
+
+	return atmel_sha_cpu_hash(dd, hmac->ipad, bs, false,
+				  atmel_sha_hmac_compute_opad_hash);
+}
+
+static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	size_t bs = ctx->block_size;
+	size_t hs = ctx->hash_size;
+	size_t i, num_words = hs / sizeof(u32);
+
+	for (i = 0; i < num_words; ++i)
+		hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
+	return atmel_sha_cpu_hash(dd, hmac->opad, bs, false,
+				  atmel_sha_hmac_setup_done);
+}
+
+static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	size_t hs = ctx->hash_size;
+	size_t i, num_words = hs / sizeof(u32);
+
+	for (i = 0; i < num_words; ++i)
+		hmac->opad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
+	atmel_sha_hmac_key_release(&hmac->hkey);
+	return hmac->resume(dd);
+}
+
+static int atmel_sha_hmac_start(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	int err;
+
+	err = atmel_sha_hw_init(dd);
+	if (err)
+		return atmel_sha_complete(dd, err);
+
+	switch (ctx->op) {
+	case SHA_OP_INIT:
+		err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_init_done);
+		break;
+
+	case SHA_OP_UPDATE:
+		dd->resume = atmel_sha_done;
+		err = atmel_sha_update_req(dd);
+		break;
+
+	case SHA_OP_FINAL:
+		dd->resume = atmel_sha_hmac_final;
+		err = atmel_sha_final_req(dd);
+		break;
+
+	case SHA_OP_DIGEST:
+		err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_digest2);
+		break;
+
+	default:
+		return atmel_sha_complete(dd, -EINVAL);
+	}
+
+	return err;
+}
+
+static int atmel_sha_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
+				 unsigned int keylen)
+{
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+
+	if (atmel_sha_hmac_key_set(&hmac->hkey, key, keylen)) {
+		crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int atmel_sha_hmac_init(struct ahash_request *req)
+{
+	int err;
+
+	err = atmel_sha_init(req);
+	if (err)
+		return err;
+
+	return atmel_sha_enqueue(req, SHA_OP_INIT);
+}
+
+static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	size_t bs = ctx->block_size;
+	size_t hs = ctx->hash_size;
+
+	ctx->bufcnt = 0;
+	ctx->digcnt[0] = bs;
+	ctx->digcnt[1] = 0;
+	ctx->flags |= SHA_FLAGS_RESTORE;
+	memcpy(ctx->digest, hmac->ipad, hs);
+	return atmel_sha_complete(dd, 0);
+}
+
+static int atmel_sha_hmac_final(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	u32 *digest = (u32 *)ctx->digest;
+	size_t ds = crypto_ahash_digestsize(tfm);
+	size_t bs = ctx->block_size;
+	size_t hs = ctx->hash_size;
+	size_t i, num_words;
+	u32 mr;
+
+	/* Save d = SHA((K' + ipad) | msg). */
+	num_words = ds / sizeof(u32);
+	for (i = 0; i < num_words; ++i)
+		digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
+
+	/* Restore context to finish computing SHA((K' + opad) | d). */
+	atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
+	num_words = hs / sizeof(u32);
+	for (i = 0; i < num_words; ++i)
+		atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
+
+	mr = SHA_MR_MODE_AUTO | SHA_MR_UIHV;
+	mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
+	atmel_sha_write(dd, SHA_MR, mr);
+	atmel_sha_write(dd, SHA_MSR, bs + ds);
+	atmel_sha_write(dd, SHA_BCR, ds);
+	atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
+
+	sg_init_one(&dd->tmp, digest, ds);
+	return atmel_sha_cpu_start(dd, &dd->tmp, ds, false, true,
+				   atmel_sha_hmac_final_done);
+}
+
+static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd)
+{
+	/*
+	 * req->result might not be sizeof(u32) aligned, so copy the
+	 * digest into ctx->digest[] before memcpy() the data into
+	 * req->result.
+	 */
+	atmel_sha_copy_hash(dd->req);
+	atmel_sha_copy_ready_hash(dd->req);
+	return atmel_sha_complete(dd, 0);
+}
+
+static int atmel_sha_hmac_digest(struct ahash_request *req)
+{
+	int err;
+
+	err = atmel_sha_init(req);
+	if (err)
+		return err;
+
+	return atmel_sha_enqueue(req, SHA_OP_DIGEST);
+}
+
+static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd)
+{
+	struct ahash_request *req = dd->req;
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
+	size_t hs = ctx->hash_size;
+	size_t i, num_words = hs / sizeof(u32);
+	bool use_dma = false;
+	u32 mr;
+
+	/* Special case for empty message. */
+	if (!req->nbytes)
+		return atmel_sha_complete(dd, -EINVAL); // TODO:
+
+	/* Check DMA threshold and alignment. */
+	if (req->nbytes > ATMEL_SHA_DMA_THRESHOLD &&
+	    atmel_sha_dma_check_aligned(dd, req->src, req->nbytes))
+		use_dma = true;
+
+	/* Write both initial hash values to compute a HMAC. */
+	atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
+	for (i = 0; i < num_words; ++i)
+		atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
+
+	atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
+	for (i = 0; i < num_words; ++i)
+		atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
+
+	/* Write the Mode, Message Size, Bytes Count then Control Registers. */
+	mr = (SHA_MR_HMAC | SHA_MR_DUALBUFF);
+	mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
+	if (use_dma)
+		mr |= SHA_MR_MODE_IDATAR0;
+	else
+		mr |= SHA_MR_MODE_AUTO;
+	atmel_sha_write(dd, SHA_MR, mr);
+
+	atmel_sha_write(dd, SHA_MSR, req->nbytes);
+	atmel_sha_write(dd, SHA_BCR, req->nbytes);
+
+	atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
+
+	/* Process data. */
+	if (use_dma)
+		return atmel_sha_dma_start(dd, req->src, req->nbytes,
+					   atmel_sha_hmac_final_done);
+
+	return atmel_sha_cpu_start(dd, req->src, req->nbytes, false, true,
+				   atmel_sha_hmac_final_done);
+}
+
+static int atmel_sha_hmac_cra_init(struct crypto_tfm *tfm)
+{
+	struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
+
+	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+				 sizeof(struct atmel_sha_reqctx));
+	hmac->base.start = atmel_sha_hmac_start;
+	atmel_sha_hmac_key_init(&hmac->hkey);
+
+	return 0;
+}
+
+static void atmel_sha_hmac_cra_exit(struct crypto_tfm *tfm)
+{
+	struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
+
+	atmel_sha_hmac_key_release(&hmac->hkey);
+}
+
+static struct ahash_alg sha_hmac_algs[] = {
+{
+	.init		= atmel_sha_hmac_init,
+	.update		= atmel_sha_update,
+	.final		= atmel_sha_final,
+	.digest		= atmel_sha_hmac_digest,
+	.setkey		= atmel_sha_hmac_setkey,
+	.export		= atmel_sha_export,
+	.import		= atmel_sha_import,
+	.halg = {
+		.digestsize	= SHA1_DIGEST_SIZE,
+		.statesize	= sizeof(struct atmel_sha_reqctx),
+		.base	= {
+			.cra_name		= "hmac(sha1)",
+			.cra_driver_name	= "atmel-hmac-sha1",
+			.cra_priority		= 100,
+			.cra_flags		= CRYPTO_ALG_ASYNC,
+			.cra_blocksize		= SHA1_BLOCK_SIZE,
+			.cra_ctxsize		= sizeof(struct atmel_sha_hmac_ctx),
+			.cra_alignmask		= 0,
+			.cra_module		= THIS_MODULE,
+			.cra_init		= atmel_sha_hmac_cra_init,
+			.cra_exit		= atmel_sha_hmac_cra_exit,
+		}
+	}
+},
+{
+	.init		= atmel_sha_hmac_init,
+	.update		= atmel_sha_update,
+	.final		= atmel_sha_final,
+	.digest		= atmel_sha_hmac_digest,
+	.setkey		= atmel_sha_hmac_setkey,
+	.export		= atmel_sha_export,
+	.import		= atmel_sha_import,
+	.halg = {
+		.digestsize	= SHA224_DIGEST_SIZE,
+		.statesize	= sizeof(struct atmel_sha_reqctx),
+		.base	= {
+			.cra_name		= "hmac(sha224)",
+			.cra_driver_name	= "atmel-hmac-sha224",
+			.cra_priority		= 100,
+			.cra_flags		= CRYPTO_ALG_ASYNC,
+			.cra_blocksize		= SHA224_BLOCK_SIZE,
+			.cra_ctxsize		= sizeof(struct atmel_sha_hmac_ctx),
+			.cra_alignmask		= 0,
+			.cra_module		= THIS_MODULE,
+			.cra_init		= atmel_sha_hmac_cra_init,
+			.cra_exit		= atmel_sha_hmac_cra_exit,
+		}
+	}
+},
+{
+	.init		= atmel_sha_hmac_init,
+	.update		= atmel_sha_update,
+	.final		= atmel_sha_final,
+	.digest		= atmel_sha_hmac_digest,
+	.setkey		= atmel_sha_hmac_setkey,
+	.export		= atmel_sha_export,
+	.import		= atmel_sha_import,
+	.halg = {
+		.digestsize	= SHA256_DIGEST_SIZE,
+		.statesize	= sizeof(struct atmel_sha_reqctx),
+		.base	= {
+			.cra_name		= "hmac(sha256)",
+			.cra_driver_name	= "atmel-hmac-sha256",
+			.cra_priority		= 100,
+			.cra_flags		= CRYPTO_ALG_ASYNC,
+			.cra_blocksize		= SHA256_BLOCK_SIZE,
+			.cra_ctxsize		= sizeof(struct atmel_sha_hmac_ctx),
+			.cra_alignmask		= 0,
+			.cra_module		= THIS_MODULE,
+			.cra_init		= atmel_sha_hmac_cra_init,
+			.cra_exit		= atmel_sha_hmac_cra_exit,
+		}
+	}
+},
+{
+	.init		= atmel_sha_hmac_init,
+	.update		= atmel_sha_update,
+	.final		= atmel_sha_final,
+	.digest		= atmel_sha_hmac_digest,
+	.setkey		= atmel_sha_hmac_setkey,
+	.export		= atmel_sha_export,
+	.import		= atmel_sha_import,
+	.halg = {
+		.digestsize	= SHA384_DIGEST_SIZE,
+		.statesize	= sizeof(struct atmel_sha_reqctx),
+		.base	= {
+			.cra_name		= "hmac(sha384)",
+			.cra_driver_name	= "atmel-hmac-sha384",
+			.cra_priority		= 100,
+			.cra_flags		= CRYPTO_ALG_ASYNC,
+			.cra_blocksize		= SHA384_BLOCK_SIZE,
+			.cra_ctxsize		= sizeof(struct atmel_sha_hmac_ctx),
+			.cra_alignmask		= 0,
+			.cra_module		= THIS_MODULE,
+			.cra_init		= atmel_sha_hmac_cra_init,
+			.cra_exit		= atmel_sha_hmac_cra_exit,
+		}
+	}
+},
+{
+	.init		= atmel_sha_hmac_init,
+	.update		= atmel_sha_update,
+	.final		= atmel_sha_final,
+	.digest		= atmel_sha_hmac_digest,
+	.setkey		= atmel_sha_hmac_setkey,
+	.export		= atmel_sha_export,
+	.import		= atmel_sha_import,
+	.halg = {
+		.digestsize	= SHA512_DIGEST_SIZE,
+		.statesize	= sizeof(struct atmel_sha_reqctx),
+		.base	= {
+			.cra_name		= "hmac(sha512)",
+			.cra_driver_name	= "atmel-hmac-sha512",
+			.cra_priority		= 100,
+			.cra_flags		= CRYPTO_ALG_ASYNC,
+			.cra_blocksize		= SHA512_BLOCK_SIZE,
+			.cra_ctxsize		= sizeof(struct atmel_sha_hmac_ctx),
+			.cra_alignmask		= 0,
+			.cra_module		= THIS_MODULE,
+			.cra_init		= atmel_sha_hmac_cra_init,
+			.cra_exit		= atmel_sha_hmac_cra_exit,
+		}
+	}
+},
+};
 
 static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
 {
 	int i;
 
+	if (dd->caps.has_hmac)
+		for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++)
+			crypto_unregister_ahash(&sha_hmac_algs[i]);
+
 	for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++)
 		crypto_unregister_ahash(&sha_1_256_algs[i]);
 
@@ -1563,8 +2144,21 @@ static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
 		}
 	}
 
+	if (dd->caps.has_hmac) {
+		for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++) {
+			err = crypto_register_ahash(&sha_hmac_algs[i]);
+			if (err)
+				goto err_sha_hmac_algs;
+		}
+	}
+
 	return 0;
 
+	/*i = ARRAY_SIZE(sha_hmac_algs);*/
+err_sha_hmac_algs:
+	for (j = 0; j < i; j++)
+		crypto_unregister_ahash(&sha_hmac_algs[j]);
+	i = ARRAY_SIZE(sha_384_512_algs);
 err_sha_384_512_algs:
 	for (j = 0; j < i; j++)
 		crypto_unregister_ahash(&sha_384_512_algs[j]);
@@ -1634,6 +2228,7 @@ static void atmel_sha_get_cap(struct atmel_sha_dev *dd)
 	dd->caps.has_sha224 = 0;
 	dd->caps.has_sha_384_512 = 0;
 	dd->caps.has_uihv = 0;
+	dd->caps.has_hmac = 0;
 
 	/* keep only major version number */
 	switch (dd->hw_version & 0xff0) {
@@ -1643,6 +2238,7 @@ static void atmel_sha_get_cap(struct atmel_sha_dev *dd)
 		dd->caps.has_sha224 = 1;
 		dd->caps.has_sha_384_512 = 1;
 		dd->caps.has_uihv = 1;
+		dd->caps.has_hmac = 1;
 		break;
 	case 0x420:
 		dd->caps.has_dma = 1;
-- 
2.7.4

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#1546481 — [PATCH v2 05/12] crypto: atmel-sha: add atmel_sha_wait_for_data_ready()

This patch simply defines a helper function to test the 'Data Ready' flag
of the Status Register. It also gives a chance for the crypto request to
be processed synchronously if this 'Data Ready' flag is already set when
polling the Status Register. Indeed, running synchronously avoid the
latency of the 'Data Ready' interrupt.

When the 'Data Ready' flag has not been set yet, we enable the associated
interrupt and resume processing the crypto request asynchronously from the
'done' task just as before.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/crypto/atmel-sha.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index b29a4e5bc404..be0d72cf4352 100644
--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -434,6 +434,19 @@ static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
 	atmel_sha_write(dd, SHA_MR, valmr);
 }
 
+static inline int atmel_sha_wait_for_data_ready(struct atmel_sha_dev *dd,
+						atmel_sha_fn_t resume)
+{
+	u32 isr = atmel_sha_read(dd, SHA_ISR);
+
+	if (unlikely(isr & SHA_INT_DATARDY))
+		return resume(dd);
+
+	dd->resume = resume;
+	atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
+	return -EINPROGRESS;
+}
+
 static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
 			      size_t length, int final)
 {
-- 
2.7.4

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#1546485 — [PATCH v2 01/12] crypto: atmel-sha: create function to get an Atmel SHA device

This is a transitional patch: it creates the atmel_sha_find_dev() function,
which will be used in further patches to share the source code responsible
for finding a Atmel SHA device.

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
---
 drivers/crypto/atmel-sha.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index 97e34799e077..33a36e667547 100644
--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -260,11 +260,8 @@ static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
 	}
 }
 
-static int atmel_sha_init(struct ahash_request *req)
+static struct atmel_sha_dev *atmel_sha_find_dev(struct atmel_sha_ctx *tctx)
 {
-	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
-	struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
-	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
 	struct atmel_sha_dev *dd = NULL;
 	struct atmel_sha_dev *tmp;
 
@@ -281,6 +278,16 @@ static int atmel_sha_init(struct ahash_request *req)
 
 	spin_unlock_bh(&atmel_sha.lock);
 
+	return dd;
+}
+
+static int atmel_sha_init(struct ahash_request *req)
+{
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
+	struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+	struct atmel_sha_dev *dd = atmel_sha_find_dev(tctx);
+
 	ctx->dd = dd;
 
 	ctx->flags = 0;
-- 
2.7.4

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