Commit 89a82ef8 authored by Cyrille Pitchen's avatar Cyrille Pitchen Committed by Herbert Xu
Browse files

crypto: atmel-authenc - add support to authenc(hmac(shaX), Y(aes)) modes 



This patchs allows to combine the AES and SHA hardware accelerators on
some Atmel SoCs. Doing so, AES blocks are only written to/read from the
AES hardware. Those blocks are also transferred from the AES to the SHA
accelerator internally, without additionnal accesses to the system busses.

Hence, the AES and SHA accelerators work in parallel to process all the
data blocks, instead of serializing the process by (de)crypting those
blocks first then authenticating them after like the generic
crypto/authenc.c driver does.

Of course, both the AES and SHA hardware accelerators need to be available
before we can start to process the data blocks. Hence we use their crypto
request queue to synchronize both drivers.

Signed-off-by: default avatarCyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent a1f613f1

drivers/crypto/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -415,6 +415,18 @@ config CRYPTO_DEV_BFIN_CRC 
	  Newer Blackfin processors have CRC hardware. Select this if you

	  want to use the Blackfin CRC module.



config CRYPTO_DEV_ATMEL_AUTHENC

	tristate "Support for Atmel IPSEC/SSL hw accelerator"

	depends on (ARCH_AT91 && HAS_DMA) || COMPILE_TEST

	select CRYPTO_AUTHENC

	select CRYPTO_DEV_ATMEL_AES

	select CRYPTO_DEV_ATMEL_SHA

	help

	  Some Atmel processors can combine the AES and SHA hw accelerators

	  to enhance support of IPSEC/SSL.

	  Select this if you want to use the Atmel modules for

	  authenc(hmac(shaX),Y(cbc)) algorithms.



config CRYPTO_DEV_ATMEL_AES

	tristate "Support for Atmel AES hw accelerator"

	depends on HAS_DMA

drivers/crypto/atmel-aes-regs.h

+16 −0
Original line number Diff line number Diff line
@@ -68,6 +68,22 @@ 
#define AES_CTRR	0x98

#define AES_GCMHR(x)	(0x9c + ((x) * 0x04))



#define AES_EMR		0xb0

#define AES_EMR_APEN		BIT(0)	/* Auto Padding Enable */

#define AES_EMR_APM		BIT(1)	/* Auto Padding Mode */

#define AES_EMR_APM_IPSEC	0x0

#define AES_EMR_APM_SSL		BIT(1)

#define AES_EMR_PLIPEN		BIT(4)	/* PLIP Enable */

#define AES_EMR_PLIPD		BIT(5)	/* PLIP Decipher */

#define AES_EMR_PADLEN_MASK	(0xFu << 8)

#define AES_EMR_PADLEN_OFFSET	8

#define AES_EMR_PADLEN(padlen)	(((padlen) << AES_EMR_PADLEN_OFFSET) &\

				 AES_EMR_PADLEN_MASK)

#define AES_EMR_NHEAD_MASK	(0xFu << 16)

#define AES_EMR_NHEAD_OFFSET	16

#define AES_EMR_NHEAD(nhead)	(((nhead) << AES_EMR_NHEAD_OFFSET) &\

				 AES_EMR_NHEAD_MASK)



#define AES_TWR(x)	(0xc0 + ((x) * 0x04))

#define AES_ALPHAR(x)	(0xd0 + ((x) * 0x04))

drivers/crypto/atmel-aes.c

+447 −1
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ 
#include <linux/platform_data/crypto-atmel.h>

#include <dt-bindings/dma/at91.h>

#include "atmel-aes-regs.h"

#include "atmel-authenc.h"



#define ATMEL_AES_PRIORITY	300
@@ -78,6 +79,7 @@ 
#define AES_FLAGS_INIT		BIT(2)

#define AES_FLAGS_BUSY		BIT(3)

#define AES_FLAGS_DUMP_REG	BIT(4)

#define AES_FLAGS_OWN_SHA	BIT(5)



#define AES_FLAGS_PERSISTENT	(AES_FLAGS_INIT | AES_FLAGS_BUSY)
@@ -92,6 +94,7 @@ struct atmel_aes_caps { 
	bool			has_ctr32;

	bool			has_gcm;

	bool			has_xts;

	bool			has_authenc;

	u32			max_burst_size;

};
@@ -144,10 +147,31 @@ struct atmel_aes_xts_ctx { 
	u32			key2[AES_KEYSIZE_256 / sizeof(u32)];

};



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

struct atmel_aes_authenc_ctx {

	struct atmel_aes_base_ctx	base;

	struct atmel_sha_authenc_ctx	*auth;

};

#endif



struct atmel_aes_reqctx {

	unsigned long		mode;

};



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

struct atmel_aes_authenc_reqctx {

	struct atmel_aes_reqctx	base;



	struct scatterlist	src[2];

	struct scatterlist	dst[2];

	size_t			textlen;

	u32			digest[SHA512_DIGEST_SIZE / sizeof(u32)];



	/* auth_req MUST be place last. */

	struct ahash_request	auth_req;

};

#endif



struct atmel_aes_dma {

	struct dma_chan		*chan;

	struct scatterlist	*sg;
@@ -291,6 +315,9 @@ static const char *atmel_aes_reg_name(u32 offset, char *tmp, size_t sz) 
		snprintf(tmp, sz, "GCMHR[%u]", (offset - AES_GCMHR(0)) >> 2);

		break;



	case AES_EMR:

		return "EMR";



	case AES_TWR(0):

	case AES_TWR(1):

	case AES_TWR(2):
@@ -463,8 +490,16 @@ static inline bool atmel_aes_is_encrypt(const struct atmel_aes_dev *dd) 
	return (dd->flags & AES_FLAGS_ENCRYPT);

}



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

static void atmel_aes_authenc_complete(struct atmel_aes_dev *dd, int err);

#endif



static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err)

{

#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

	atmel_aes_authenc_complete(dd, err);

#endif



	clk_disable(dd->iclk);

	dd->flags &= ~AES_FLAGS_BUSY;
@@ -1931,6 +1966,384 @@ static struct crypto_alg aes_xts_alg = { 
	}

};



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

/* authenc aead functions */



static int atmel_aes_authenc_start(struct atmel_aes_dev *dd);

static int atmel_aes_authenc_init(struct atmel_aes_dev *dd, int err,

				  bool is_async);

static int atmel_aes_authenc_transfer(struct atmel_aes_dev *dd, int err,

				      bool is_async);

static int atmel_aes_authenc_digest(struct atmel_aes_dev *dd);

static int atmel_aes_authenc_final(struct atmel_aes_dev *dd, int err,

				   bool is_async);



static void atmel_aes_authenc_complete(struct atmel_aes_dev *dd, int err)

{

	struct aead_request *req = aead_request_cast(dd->areq);

	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);



	if (err && (dd->flags & AES_FLAGS_OWN_SHA))

		atmel_sha_authenc_abort(&rctx->auth_req);

	dd->flags &= ~AES_FLAGS_OWN_SHA;

}



static int atmel_aes_authenc_start(struct atmel_aes_dev *dd)

{

	struct aead_request *req = aead_request_cast(dd->areq);

	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);

	struct crypto_aead *tfm = crypto_aead_reqtfm(req);

	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);

	int err;



	atmel_aes_set_mode(dd, &rctx->base);



	err = atmel_aes_hw_init(dd);

	if (err)

		return atmel_aes_complete(dd, err);



	return atmel_sha_authenc_schedule(&rctx->auth_req, ctx->auth,

					  atmel_aes_authenc_init, dd);

}



static int atmel_aes_authenc_init(struct atmel_aes_dev *dd, int err,

				  bool is_async)

{

	struct aead_request *req = aead_request_cast(dd->areq);

	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);



	if (is_async)

		dd->is_async = true;

	if (err)

		return atmel_aes_complete(dd, err);



	/* If here, we've got the ownership of the SHA device. */

	dd->flags |= AES_FLAGS_OWN_SHA;



	/* Configure the SHA device. */

	return atmel_sha_authenc_init(&rctx->auth_req,

				      req->src, req->assoclen,

				      rctx->textlen,

				      atmel_aes_authenc_transfer, dd);

}



static int atmel_aes_authenc_transfer(struct atmel_aes_dev *dd, int err,

				      bool is_async)

{

	struct aead_request *req = aead_request_cast(dd->areq);

	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);

	bool enc = atmel_aes_is_encrypt(dd);

	struct scatterlist *src, *dst;

	u32 iv[AES_BLOCK_SIZE / sizeof(u32)];

	u32 emr;



	if (is_async)

		dd->is_async = true;

	if (err)

		return atmel_aes_complete(dd, err);



	/* Prepare src and dst scatter-lists to transfer cipher/plain texts. */

	src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);

	dst = src;



	if (req->src != req->dst)

		dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);



	/* Configure the AES device. */

	memcpy(iv, req->iv, sizeof(iv));



	/*

	 * Here we always set the 2nd parameter of atmel_aes_write_ctrl() to

	 * 'true' even if the data transfer is actually performed by the CPU (so

	 * not by the DMA) because we must force the AES_MR_SMOD bitfield to the

	 * value AES_MR_SMOD_IDATAR0. Indeed, both AES_MR_SMOD and SHA_MR_SMOD

	 * must be set to *_MR_SMOD_IDATAR0.

	 */

	atmel_aes_write_ctrl(dd, true, iv);

	emr = AES_EMR_PLIPEN;

	if (!enc)

		emr |= AES_EMR_PLIPD;

	atmel_aes_write(dd, AES_EMR, emr);



	/* Transfer data. */

	return atmel_aes_dma_start(dd, src, dst, rctx->textlen,

				   atmel_aes_authenc_digest);

}



static int atmel_aes_authenc_digest(struct atmel_aes_dev *dd)

{

	struct aead_request *req = aead_request_cast(dd->areq);

	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);



	/* atmel_sha_authenc_final() releases the SHA device. */

	dd->flags &= ~AES_FLAGS_OWN_SHA;

	return atmel_sha_authenc_final(&rctx->auth_req,

				       rctx->digest, sizeof(rctx->digest),

				       atmel_aes_authenc_final, dd);

}



static int atmel_aes_authenc_final(struct atmel_aes_dev *dd, int err,

				   bool is_async)

{

	struct aead_request *req = aead_request_cast(dd->areq);

	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);

	struct crypto_aead *tfm = crypto_aead_reqtfm(req);

	bool enc = atmel_aes_is_encrypt(dd);

	u32 idigest[SHA512_DIGEST_SIZE / sizeof(u32)], *odigest = rctx->digest;

	u32 offs, authsize;



	if (is_async)

		dd->is_async = true;

	if (err)

		goto complete;



	offs = req->assoclen + rctx->textlen;

	authsize = crypto_aead_authsize(tfm);

	if (enc) {

		scatterwalk_map_and_copy(odigest, req->dst, offs, authsize, 1);

	} else {

		scatterwalk_map_and_copy(idigest, req->src, offs, authsize, 0);

		if (crypto_memneq(idigest, odigest, authsize))

			err = -EBADMSG;

	}



complete:

	return atmel_aes_complete(dd, err);

}



static int atmel_aes_authenc_setkey(struct crypto_aead *tfm, const u8 *key,

				    unsigned int keylen)

{

	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);

	struct crypto_authenc_keys keys;

	u32 flags;

	int err;



	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)

		goto badkey;



	if (keys.enckeylen > sizeof(ctx->base.key))

		goto badkey;



	/* Save auth key. */

	flags = crypto_aead_get_flags(tfm);

	err = atmel_sha_authenc_setkey(ctx->auth,

				       keys.authkey, keys.authkeylen,

				       &flags);

	crypto_aead_set_flags(tfm, flags & CRYPTO_TFM_RES_MASK);

	if (err) {

		memzero_explicit(&keys, sizeof(keys));

		return err;

	}



	/* Save enc key. */

	ctx->base.keylen = keys.enckeylen;

	memcpy(ctx->base.key, keys.enckey, keys.enckeylen);



	memzero_explicit(&keys, sizeof(keys));

	return 0;



badkey:

	crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);

	memzero_explicit(&key, sizeof(keys));

	return -EINVAL;

}



static int atmel_aes_authenc_init_tfm(struct crypto_aead *tfm,

				      unsigned long auth_mode)

{

	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);

	unsigned int auth_reqsize = atmel_sha_authenc_get_reqsize();



	ctx->auth = atmel_sha_authenc_spawn(auth_mode);

	if (IS_ERR(ctx->auth))

		return PTR_ERR(ctx->auth);



	crypto_aead_set_reqsize(tfm, (sizeof(struct atmel_aes_authenc_reqctx) +

				      auth_reqsize));

	ctx->base.start = atmel_aes_authenc_start;



	return 0;

}



static int atmel_aes_authenc_hmac_sha1_init_tfm(struct crypto_aead *tfm)

{

	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA1);

}



static int atmel_aes_authenc_hmac_sha224_init_tfm(struct crypto_aead *tfm)

{

	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA224);

}



static int atmel_aes_authenc_hmac_sha256_init_tfm(struct crypto_aead *tfm)

{

	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA256);

}



static int atmel_aes_authenc_hmac_sha384_init_tfm(struct crypto_aead *tfm)

{

	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA384);

}



static int atmel_aes_authenc_hmac_sha512_init_tfm(struct crypto_aead *tfm)

{

	return atmel_aes_authenc_init_tfm(tfm, SHA_FLAGS_HMAC_SHA512);

}



static void atmel_aes_authenc_exit_tfm(struct crypto_aead *tfm)

{

	struct atmel_aes_authenc_ctx *ctx = crypto_aead_ctx(tfm);



	atmel_sha_authenc_free(ctx->auth);

}



static int atmel_aes_authenc_crypt(struct aead_request *req,

				   unsigned long mode)

{

	struct atmel_aes_authenc_reqctx *rctx = aead_request_ctx(req);

	struct crypto_aead *tfm = crypto_aead_reqtfm(req);

	struct atmel_aes_base_ctx *ctx = crypto_aead_ctx(tfm);

	u32 authsize = crypto_aead_authsize(tfm);

	bool enc = (mode & AES_FLAGS_ENCRYPT);

	struct atmel_aes_dev *dd;



	/* Compute text length. */

	if (!enc && req->cryptlen < authsize)

		return -EINVAL;

	rctx->textlen = req->cryptlen - (enc ? 0 : authsize);



	/*

	 * Currently, empty messages are not supported yet:

	 * the SHA auto-padding can be used only on non-empty messages.

	 * Hence a special case needs to be implemented for empty message.

	 */

	if (!rctx->textlen && !req->assoclen)

		return -EINVAL;



	rctx->base.mode = mode;

	ctx->block_size = AES_BLOCK_SIZE;



	dd = atmel_aes_find_dev(ctx);

	if (!dd)

		return -ENODEV;



	return atmel_aes_handle_queue(dd, &req->base);

}



static int atmel_aes_authenc_cbc_aes_encrypt(struct aead_request *req)

{

	return atmel_aes_authenc_crypt(req, AES_FLAGS_CBC | AES_FLAGS_ENCRYPT);

}



static int atmel_aes_authenc_cbc_aes_decrypt(struct aead_request *req)

{

	return atmel_aes_authenc_crypt(req, AES_FLAGS_CBC);

}



static struct aead_alg aes_authenc_algs[] = {

{

	.setkey		= atmel_aes_authenc_setkey,

	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,

	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,

	.init		= atmel_aes_authenc_hmac_sha1_init_tfm,

	.exit		= atmel_aes_authenc_exit_tfm,

	.ivsize		= AES_BLOCK_SIZE,

	.maxauthsize	= SHA1_DIGEST_SIZE,



	.base = {

		.cra_name		= "authenc(hmac(sha1),cbc(aes))",

		.cra_driver_name	= "atmel-authenc-hmac-sha1-cbc-aes",

		.cra_priority		= ATMEL_AES_PRIORITY,

		.cra_flags		= CRYPTO_ALG_ASYNC,

		.cra_blocksize		= AES_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),

		.cra_alignmask		= 0xf,

		.cra_module		= THIS_MODULE,

	},

},

{

	.setkey		= atmel_aes_authenc_setkey,

	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,

	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,

	.init		= atmel_aes_authenc_hmac_sha224_init_tfm,

	.exit		= atmel_aes_authenc_exit_tfm,

	.ivsize		= AES_BLOCK_SIZE,

	.maxauthsize	= SHA224_DIGEST_SIZE,



	.base = {

		.cra_name		= "authenc(hmac(sha224),cbc(aes))",

		.cra_driver_name	= "atmel-authenc-hmac-sha224-cbc-aes",

		.cra_priority		= ATMEL_AES_PRIORITY,

		.cra_flags		= CRYPTO_ALG_ASYNC,

		.cra_blocksize		= AES_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),

		.cra_alignmask		= 0xf,

		.cra_module		= THIS_MODULE,

	},

},

{

	.setkey		= atmel_aes_authenc_setkey,

	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,

	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,

	.init		= atmel_aes_authenc_hmac_sha256_init_tfm,

	.exit		= atmel_aes_authenc_exit_tfm,

	.ivsize		= AES_BLOCK_SIZE,

	.maxauthsize	= SHA256_DIGEST_SIZE,



	.base = {

		.cra_name		= "authenc(hmac(sha256),cbc(aes))",

		.cra_driver_name	= "atmel-authenc-hmac-sha256-cbc-aes",

		.cra_priority		= ATMEL_AES_PRIORITY,

		.cra_flags		= CRYPTO_ALG_ASYNC,

		.cra_blocksize		= AES_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),

		.cra_alignmask		= 0xf,

		.cra_module		= THIS_MODULE,

	},

},

{

	.setkey		= atmel_aes_authenc_setkey,

	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,

	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,

	.init		= atmel_aes_authenc_hmac_sha384_init_tfm,

	.exit		= atmel_aes_authenc_exit_tfm,

	.ivsize		= AES_BLOCK_SIZE,

	.maxauthsize	= SHA384_DIGEST_SIZE,



	.base = {

		.cra_name		= "authenc(hmac(sha384),cbc(aes))",

		.cra_driver_name	= "atmel-authenc-hmac-sha384-cbc-aes",

		.cra_priority		= ATMEL_AES_PRIORITY,

		.cra_flags		= CRYPTO_ALG_ASYNC,

		.cra_blocksize		= AES_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),

		.cra_alignmask		= 0xf,

		.cra_module		= THIS_MODULE,

	},

},

{

	.setkey		= atmel_aes_authenc_setkey,

	.encrypt	= atmel_aes_authenc_cbc_aes_encrypt,

	.decrypt	= atmel_aes_authenc_cbc_aes_decrypt,

	.init		= atmel_aes_authenc_hmac_sha512_init_tfm,

	.exit		= atmel_aes_authenc_exit_tfm,

	.ivsize		= AES_BLOCK_SIZE,

	.maxauthsize	= SHA512_DIGEST_SIZE,



	.base = {

		.cra_name		= "authenc(hmac(sha512),cbc(aes))",

		.cra_driver_name	= "atmel-authenc-hmac-sha512-cbc-aes",

		.cra_priority		= ATMEL_AES_PRIORITY,

		.cra_flags		= CRYPTO_ALG_ASYNC,

		.cra_blocksize		= AES_BLOCK_SIZE,

		.cra_ctxsize		= sizeof(struct atmel_aes_authenc_ctx),

		.cra_alignmask		= 0xf,

		.cra_module		= THIS_MODULE,

	},

},

};

#endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */



/* Probe functions */
@@ -2040,6 +2453,12 @@ static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd) 
{

	int i;



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

	if (dd->caps.has_authenc)

		for (i = 0; i < ARRAY_SIZE(aes_authenc_algs); i++)

			crypto_unregister_aead(&aes_authenc_algs[i]);

#endif



	if (dd->caps.has_xts)

		crypto_unregister_alg(&aes_xts_alg);
@@ -2081,8 +2500,25 @@ static int atmel_aes_register_algs(struct atmel_aes_dev *dd) 
			goto err_aes_xts_alg;

	}



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

	if (dd->caps.has_authenc) {

		for (i = 0; i < ARRAY_SIZE(aes_authenc_algs); i++) {

			err = crypto_register_aead(&aes_authenc_algs[i]);

			if (err)

				goto err_aes_authenc_alg;

		}

	}

#endif



	return 0;



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

	/* i = ARRAY_SIZE(aes_authenc_algs); */

err_aes_authenc_alg:

	for (j = 0; j < i; j++)

		crypto_unregister_aead(&aes_authenc_algs[j]);

	crypto_unregister_alg(&aes_xts_alg);

#endif

err_aes_xts_alg:

	crypto_unregister_aead(&aes_gcm_alg);

err_aes_gcm_alg:
@@ -2103,6 +2539,7 @@ static void atmel_aes_get_cap(struct atmel_aes_dev *dd) 
	dd->caps.has_ctr32 = 0;

	dd->caps.has_gcm = 0;

	dd->caps.has_xts = 0;

	dd->caps.has_authenc = 0;

	dd->caps.max_burst_size = 1;



	/* keep only major version number */
@@ -2113,6 +2550,7 @@ static void atmel_aes_get_cap(struct atmel_aes_dev *dd) 
		dd->caps.has_ctr32 = 1;

		dd->caps.has_gcm = 1;

		dd->caps.has_xts = 1;

		dd->caps.has_authenc = 1;

		dd->caps.max_burst_size = 4;

		break;

	case 0x200:
@@ -2271,6 +2709,13 @@ static int atmel_aes_probe(struct platform_device *pdev) 


	atmel_aes_get_cap(aes_dd);



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC

	if (aes_dd->caps.has_authenc && !atmel_sha_authenc_is_ready()) {

		err = -EPROBE_DEFER;

		goto iclk_unprepare;

	}

#endif



	err = atmel_aes_buff_init(aes_dd);

	if (err)

		goto err_aes_buff;
@@ -2307,6 +2752,7 @@ res_err: 
	tasklet_kill(&aes_dd->done_task);

	tasklet_kill(&aes_dd->queue_task);

aes_dd_err:

	if (err != -EPROBE_DEFER)

		dev_err(dev, "initialization failed.\n");



	return err;

drivers/crypto/atmel-authenc.h

0 → 100644
+64 −0
Original line number Diff line number Diff line 
/*

 * API for Atmel Secure Protocol Layers Improved Performances (SPLIP)

 *

 * Copyright (C) 2016 Atmel Corporation

 *

 * Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * This driver is based on drivers/mtd/spi-nor/fsl-quadspi.c from Freescale.

 */



#ifndef __ATMEL_AUTHENC_H__

#define __ATMEL_AUTHENC_H__



#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC



#include <crypto/authenc.h>

#include <crypto/hash.h>

#include <crypto/sha.h>

#include "atmel-sha-regs.h"



struct atmel_aes_dev;

typedef int (*atmel_aes_authenc_fn_t)(struct atmel_aes_dev *, int, bool);



struct atmel_sha_authenc_ctx;



bool atmel_sha_authenc_is_ready(void);

unsigned int atmel_sha_authenc_get_reqsize(void);



struct atmel_sha_authenc_ctx *atmel_sha_authenc_spawn(unsigned long mode);

void atmel_sha_authenc_free(struct atmel_sha_authenc_ctx *auth);

int atmel_sha_authenc_setkey(struct atmel_sha_authenc_ctx *auth,

			     const u8 *key, unsigned int keylen,

			     u32 *flags);



int atmel_sha_authenc_schedule(struct ahash_request *req,

			       struct atmel_sha_authenc_ctx *auth,

			       atmel_aes_authenc_fn_t cb,

			       struct atmel_aes_dev *dd);

int atmel_sha_authenc_init(struct ahash_request *req,

			   struct scatterlist *assoc, unsigned int assoclen,

			   unsigned int textlen,

			   atmel_aes_authenc_fn_t cb,

			   struct atmel_aes_dev *dd);

int atmel_sha_authenc_final(struct ahash_request *req,

			    u32 *digest, unsigned int digestlen,

			    atmel_aes_authenc_fn_t cb,

			    struct atmel_aes_dev *dd);

void  atmel_sha_authenc_abort(struct ahash_request *req);



#endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */



#endif /* __ATMEL_AUTHENC_H__ */

drivers/crypto/atmel-sha-regs.h

+14 −0
Original line number Diff line number Diff line
@@ -29,6 +29,20 @@ 
#define SHA_MR_HMAC			(1 << 11)

#define	SHA_MR_DUALBUFF			(1 << 16)



#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_IER				0x10

#define SHA_IDR				0x14

#define SHA_IMR				0x18

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