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Commit b7c89d9e authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: aesni - Convert rfc4106 to new AEAD interface 



This patch converts the low-level __gcm-aes-aesni algorithm to
the new AEAD interface.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 3e648cbe

arch/x86/crypto/aesni-intel_glue.c

+83 −167
Original line number Diff line number Diff line
@@ -44,13 +44,18 @@ 
#endif





#define AESNI_ALIGN	16

#define AES_BLOCK_MASK	(~(AES_BLOCK_SIZE - 1))

#define RFC4106_HASH_SUBKEY_SIZE 16



/* This data is stored at the end of the crypto_tfm struct.

 * It's a type of per "session" data storage location.

 * This needs to be 16 byte aligned.

 */

struct aesni_rfc4106_gcm_ctx {

	u8 hash_subkey[16];

	struct crypto_aes_ctx aes_key_expanded;

	u8 hash_subkey[16] __attribute__ ((__aligned__(AESNI_ALIGN)));

	struct crypto_aes_ctx aes_key_expanded

		__attribute__ ((__aligned__(AESNI_ALIGN)));

	u8 nonce[4];

};
@@ -65,10 +70,6 @@ struct aesni_hash_subkey_req_data { 
	struct scatterlist sg;

};



#define AESNI_ALIGN	(16)

#define AES_BLOCK_MASK	(~(AES_BLOCK_SIZE-1))

#define RFC4106_HASH_SUBKEY_SIZE 16



struct aesni_lrw_ctx {

	struct lrw_table_ctx lrw_table;

	u8 raw_aes_ctx[sizeof(struct crypto_aes_ctx) + AESNI_ALIGN - 1];
@@ -282,10 +283,11 @@ static void (*aesni_gcm_dec_tfm)(void *ctx, u8 *out, 
static inline struct

aesni_rfc4106_gcm_ctx *aesni_rfc4106_gcm_ctx_get(struct crypto_aead *tfm)

{

	return

		(struct aesni_rfc4106_gcm_ctx *)

		PTR_ALIGN((u8 *)

		crypto_tfm_ctx(crypto_aead_tfm(tfm)), AESNI_ALIGN);

	unsigned long align = AESNI_ALIGN;



	if (align <= crypto_tfm_ctx_alignment())

		align = 1;

	return PTR_ALIGN(crypto_aead_ctx(tfm), align);

}

#endif
@@ -838,8 +840,6 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len) 
	if (IS_ERR(ctr_tfm))

		return PTR_ERR(ctr_tfm);



	crypto_ablkcipher_clear_flags(ctr_tfm, ~0);



	ret = crypto_ablkcipher_setkey(ctr_tfm, key, key_len);

	if (ret)

		goto out_free_ablkcipher;
@@ -888,56 +888,20 @@ rfc4106_set_hash_subkey(u8 *hash_subkey, const u8 *key, unsigned int key_len) 
static int common_rfc4106_set_key(struct crypto_aead *aead, const u8 *key,

				  unsigned int key_len)

{

	int ret = 0;

	struct crypto_tfm *tfm = crypto_aead_tfm(aead);

	struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(aead);

	u8 *new_key_align, *new_key_mem = NULL;



	if (key_len < 4) {

		crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);

		crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);

		return -EINVAL;

	}

	/*Account for 4 byte nonce at the end.*/

	key_len -= 4;

	if (key_len != AES_KEYSIZE_128 && key_len != AES_KEYSIZE_192 &&

	    key_len != AES_KEYSIZE_256) {

		crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);

		return -EINVAL;

	}



	memcpy(ctx->nonce, key + key_len, sizeof(ctx->nonce));

	/*This must be on a 16 byte boundary!*/

	if ((unsigned long)(&(ctx->aes_key_expanded.key_enc[0])) % AESNI_ALIGN)

		return -EINVAL;



	if ((unsigned long)key % AESNI_ALIGN) {

		/*key is not aligned: use an auxuliar aligned pointer*/

		new_key_mem = kmalloc(key_len+AESNI_ALIGN, GFP_KERNEL);

		if (!new_key_mem)

			return -ENOMEM;



		new_key_align = PTR_ALIGN(new_key_mem, AESNI_ALIGN);

		memcpy(new_key_align, key, key_len);

		key = new_key_align;

	}



	if (!irq_fpu_usable())

		ret = crypto_aes_expand_key(&(ctx->aes_key_expanded),

		key, key_len);

	else {

		kernel_fpu_begin();

		ret = aesni_set_key(&(ctx->aes_key_expanded), key, key_len);

		kernel_fpu_end();

	}

	/*This must be on a 16 byte boundary!*/

	if ((unsigned long)(&(ctx->hash_subkey[0])) % AESNI_ALIGN) {

		ret = -EINVAL;

		goto exit;

	}

	ret = rfc4106_set_hash_subkey(ctx->hash_subkey, key, key_len);

exit:

	kfree(new_key_mem);

	return ret;

	return aes_set_key_common(crypto_aead_tfm(aead),

				  &ctx->aes_key_expanded, key, key_len) ?:

	       rfc4106_set_hash_subkey(ctx->hash_subkey, key, key_len);

}



static int rfc4106_set_key(struct crypto_aead *parent, const u8 *key,
@@ -960,7 +924,7 @@ static int common_rfc4106_set_authsize(struct crypto_aead *aead, 
	default:

		return -EINVAL;

	}

	crypto_aead_crt(aead)->authsize = authsize;



	return 0;

}
@@ -975,20 +939,17 @@ static int rfc4106_set_authsize(struct crypto_aead *parent, 
	return crypto_aead_setauthsize(&cryptd_tfm->base, authsize);

}



static int __driver_rfc4106_encrypt(struct aead_request *req)

static int helper_rfc4106_encrypt(struct aead_request *req)

{

	u8 one_entry_in_sg = 0;

	u8 *src, *dst, *assoc;

	__be32 counter = cpu_to_be32(1);

	struct crypto_aead *tfm = crypto_aead_reqtfm(req);

	struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);

	u32 key_len = ctx->aes_key_expanded.key_length;

	void *aes_ctx = &(ctx->aes_key_expanded);

	unsigned long auth_tag_len = crypto_aead_authsize(tfm);

	u8 iv_tab[16+AESNI_ALIGN];

	u8* iv = (u8 *) PTR_ALIGN((u8 *)iv_tab, AESNI_ALIGN);

	u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN)));

	struct scatter_walk src_sg_walk;

	struct scatter_walk assoc_sg_walk;

	struct scatter_walk dst_sg_walk;

	unsigned int i;
@@ -997,12 +958,6 @@ static int __driver_rfc4106_encrypt(struct aead_request *req) 
	/* to 8 or 12 bytes */

	if (unlikely(req->assoclen != 8 && req->assoclen != 12))

		return -EINVAL;

	if (unlikely(auth_tag_len != 8 && auth_tag_len != 12 && auth_tag_len != 16))

	        return -EINVAL;

	if (unlikely(key_len != AES_KEYSIZE_128 &&

	             key_len != AES_KEYSIZE_192 &&

	             key_len != AES_KEYSIZE_256))

	        return -EINVAL;



	/* IV below built */

	for (i = 0; i < 4; i++)
@@ -1011,55 +966,57 @@ static int __driver_rfc4106_encrypt(struct aead_request *req) 
		*(iv+4+i) = req->iv[i];

	*((__be32 *)(iv+12)) = counter;



	if ((sg_is_last(req->src)) && (sg_is_last(req->assoc))) {

	if (sg_is_last(req->src) &&

	    req->src->offset + req->src->length <= PAGE_SIZE &&

	    sg_is_last(req->dst) &&

	    req->dst->offset + req->dst->length <= PAGE_SIZE) {

		one_entry_in_sg = 1;

		scatterwalk_start(&src_sg_walk, req->src);

		scatterwalk_start(&assoc_sg_walk, req->assoc);

		src = scatterwalk_map(&src_sg_walk);

		assoc = scatterwalk_map(&assoc_sg_walk);

		assoc = scatterwalk_map(&src_sg_walk);

		src = assoc + req->assoclen;

		dst = src;

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

			scatterwalk_start(&dst_sg_walk, req->dst);

			dst = scatterwalk_map(&dst_sg_walk);

			dst = scatterwalk_map(&dst_sg_walk) + req->assoclen;

		}



	} else {

		/* Allocate memory for src, dst, assoc */

		src = kmalloc(req->cryptlen + auth_tag_len + req->assoclen,

		assoc = kmalloc(req->cryptlen + auth_tag_len + req->assoclen,

			GFP_ATOMIC);

		if (unlikely(!src))

		if (unlikely(!assoc))

			return -ENOMEM;

		assoc = (src + req->cryptlen + auth_tag_len);

		scatterwalk_map_and_copy(src, req->src, 0, req->cryptlen, 0);

		scatterwalk_map_and_copy(assoc, req->assoc, 0,

					req->assoclen, 0);

		scatterwalk_map_and_copy(assoc, req->src, 0,

					 req->assoclen + req->cryptlen, 0);

		src = assoc + req->assoclen;

		dst = src;

	}



	kernel_fpu_begin();

	aesni_gcm_enc_tfm(aes_ctx, dst, src, (unsigned long)req->cryptlen, iv,

		ctx->hash_subkey, assoc, (unsigned long)req->assoclen, dst

		+ ((unsigned long)req->cryptlen), auth_tag_len);

	kernel_fpu_end();



	/* The authTag (aka the Integrity Check Value) needs to be written

	 * back to the packet. */

	if (one_entry_in_sg) {

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

			scatterwalk_unmap(dst);

			scatterwalk_done(&dst_sg_walk, 0, 0);

			scatterwalk_unmap(dst - req->assoclen);

			scatterwalk_advance(&dst_sg_walk, req->dst->length);

			scatterwalk_done(&dst_sg_walk, 1, 0);

		}

		scatterwalk_unmap(src);

		scatterwalk_unmap(assoc);

		scatterwalk_done(&src_sg_walk, 0, 0);

		scatterwalk_done(&assoc_sg_walk, 0, 0);

		scatterwalk_advance(&src_sg_walk, req->src->length);

		scatterwalk_done(&src_sg_walk, req->src == req->dst, 0);

	} else {

		scatterwalk_map_and_copy(dst, req->dst, 0,

		scatterwalk_map_and_copy(dst, req->dst, req->assoclen,

					 req->cryptlen + auth_tag_len, 1);

		kfree(src);

		kfree(assoc);

	}

	return 0;

}



static int __driver_rfc4106_decrypt(struct aead_request *req)

static int helper_rfc4106_decrypt(struct aead_request *req)

{

	u8 one_entry_in_sg = 0;

	u8 *src, *dst, *assoc;
@@ -1068,25 +1025,15 @@ static int __driver_rfc4106_decrypt(struct aead_request *req) 
	int retval = 0;

	struct crypto_aead *tfm = crypto_aead_reqtfm(req);

	struct aesni_rfc4106_gcm_ctx *ctx = aesni_rfc4106_gcm_ctx_get(tfm);

	u32 key_len = ctx->aes_key_expanded.key_length;

	void *aes_ctx = &(ctx->aes_key_expanded);

	unsigned long auth_tag_len = crypto_aead_authsize(tfm);

	u8 iv_and_authTag[32+AESNI_ALIGN];

	u8 *iv = (u8 *) PTR_ALIGN((u8 *)iv_and_authTag, AESNI_ALIGN);

	u8 *authTag = iv + 16;

	u8 iv[16] __attribute__ ((__aligned__(AESNI_ALIGN)));

	u8 authTag[16];

	struct scatter_walk src_sg_walk;

	struct scatter_walk assoc_sg_walk;

	struct scatter_walk dst_sg_walk;

	unsigned int i;



	if (unlikely((req->cryptlen < auth_tag_len) ||

		(req->assoclen != 8 && req->assoclen != 12)))

		return -EINVAL;

	if (unlikely(auth_tag_len != 8 && auth_tag_len != 12 && auth_tag_len != 16))

	        return -EINVAL;

	if (unlikely(key_len != AES_KEYSIZE_128 &&

	             key_len != AES_KEYSIZE_192 &&

	             key_len != AES_KEYSIZE_256))

	if (unlikely(req->assoclen != 8 && req->assoclen != 12))

		return -EINVAL;



	/* Assuming we are supporting rfc4106 64-bit extended */
@@ -1101,33 +1048,36 @@ static int __driver_rfc4106_decrypt(struct aead_request *req) 
		*(iv+4+i) = req->iv[i];

	*((__be32 *)(iv+12)) = counter;



	if ((sg_is_last(req->src)) && (sg_is_last(req->assoc))) {

	if (sg_is_last(req->src) &&

	    req->src->offset + req->src->length <= PAGE_SIZE &&

	    sg_is_last(req->dst) &&

	    req->dst->offset + req->dst->length <= PAGE_SIZE) {

		one_entry_in_sg = 1;

		scatterwalk_start(&src_sg_walk, req->src);

		scatterwalk_start(&assoc_sg_walk, req->assoc);

		src = scatterwalk_map(&src_sg_walk);

		assoc = scatterwalk_map(&assoc_sg_walk);

		assoc = scatterwalk_map(&src_sg_walk);

		src = assoc + req->assoclen;

		dst = src;

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

			scatterwalk_start(&dst_sg_walk, req->dst);

			dst = scatterwalk_map(&dst_sg_walk);

			dst = scatterwalk_map(&dst_sg_walk) + req->assoclen;

		}



	} else {

		/* Allocate memory for src, dst, assoc */

		src = kmalloc(req->cryptlen + req->assoclen, GFP_ATOMIC);

		if (!src)

		assoc = kmalloc(req->cryptlen + req->assoclen, GFP_ATOMIC);

		if (!assoc)

			return -ENOMEM;

		assoc = (src + req->cryptlen);

		scatterwalk_map_and_copy(src, req->src, 0, req->cryptlen, 0);

		scatterwalk_map_and_copy(assoc, req->assoc, 0,

			req->assoclen, 0);

		scatterwalk_map_and_copy(assoc, req->src, 0,

					 req->assoclen + req->cryptlen, 0);

		src = assoc + req->assoclen;

		dst = src;

	}



	kernel_fpu_begin();

	aesni_gcm_dec_tfm(aes_ctx, dst, src, tempCipherLen, iv,

		ctx->hash_subkey, assoc, (unsigned long)req->assoclen,

		authTag, auth_tag_len);

	kernel_fpu_end();



	/* Compare generated tag with passed in tag. */

	retval = crypto_memneq(src + tempCipherLen, authTag, auth_tag_len) ?
@@ -1135,16 +1085,17 @@ static int __driver_rfc4106_decrypt(struct aead_request *req) 


	if (one_entry_in_sg) {

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

			scatterwalk_unmap(dst);

			scatterwalk_done(&dst_sg_walk, 0, 0);

			scatterwalk_unmap(dst - req->assoclen);

			scatterwalk_advance(&dst_sg_walk, req->dst->length);

			scatterwalk_done(&dst_sg_walk, 1, 0);

		}

		scatterwalk_unmap(src);

		scatterwalk_unmap(assoc);

		scatterwalk_done(&src_sg_walk, 0, 0);

		scatterwalk_done(&assoc_sg_walk, 0, 0);

		scatterwalk_advance(&src_sg_walk, req->src->length);

		scatterwalk_done(&src_sg_walk, req->src == req->dst, 0);

	} else {

		scatterwalk_map_and_copy(dst, req->dst, 0, tempCipherLen, 1);

		kfree(src);

		scatterwalk_map_and_copy(dst, req->dst, req->assoclen,

					 tempCipherLen, 1);

		kfree(assoc);

	}

	return retval;

}
@@ -1188,36 +1139,6 @@ static int rfc4106_decrypt(struct aead_request *req) 


	return crypto_aead_decrypt(subreq);

}



static int helper_rfc4106_encrypt(struct aead_request *req)

{

	int ret;



	if (unlikely(!irq_fpu_usable())) {

		WARN_ONCE(1, "__gcm-aes-aesni alg used in invalid context");

		ret = -EINVAL;

	} else {

		kernel_fpu_begin();

		ret = __driver_rfc4106_encrypt(req);

		kernel_fpu_end();

	}

	return ret;

}



static int helper_rfc4106_decrypt(struct aead_request *req)

{

	int ret;



	if (unlikely(!irq_fpu_usable())) {

		WARN_ONCE(1, "__gcm-aes-aesni alg used in invalid context");

		ret = -EINVAL;

	} else {

		kernel_fpu_begin();

		ret = __driver_rfc4106_decrypt(req);

		kernel_fpu_end();

	}

	return ret;

}

#endif



static struct crypto_alg aesni_algs[] = { {
@@ -1389,27 +1310,6 @@ static struct crypto_alg aesni_algs[] = { { 
			.geniv		= "chainiv",

		},

	},

}, {

	.cra_name		= "__gcm-aes-aesni",

	.cra_driver_name	= "__driver-gcm-aes-aesni",

	.cra_priority		= 0,

	.cra_flags		= CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_INTERNAL,

	.cra_blocksize		= 1,

	.cra_ctxsize		= sizeof(struct aesni_rfc4106_gcm_ctx) +

				  AESNI_ALIGN,

	.cra_alignmask		= 0,

	.cra_type		= &crypto_aead_type,

	.cra_module		= THIS_MODULE,

	.cra_u = {

		.aead = {

			.setkey		= common_rfc4106_set_key,

			.setauthsize	= common_rfc4106_set_authsize,

			.encrypt	= helper_rfc4106_encrypt,

			.decrypt	= helper_rfc4106_decrypt,

			.ivsize		= 8,

			.maxauthsize	= 16,

		},

	},

#endif

#if IS_ENABLED(CONFIG_CRYPTO_PCBC)

}, {
@@ -1526,6 +1426,22 @@ static struct crypto_alg aesni_algs[] = { { 


#ifdef CONFIG_X86_64

static struct aead_alg aesni_aead_algs[] = { {

	.setkey			= common_rfc4106_set_key,

	.setauthsize		= common_rfc4106_set_authsize,

	.encrypt		= helper_rfc4106_encrypt,

	.decrypt		= helper_rfc4106_decrypt,

	.ivsize			= 8,

	.maxauthsize		= 16,

	.base = {

		.cra_name		= "__gcm-aes-aesni",

		.cra_driver_name	= "__driver-gcm-aes-aesni",

		.cra_flags		= CRYPTO_ALG_INTERNAL,

		.cra_blocksize		= 1,

		.cra_ctxsize		= sizeof(struct aesni_rfc4106_gcm_ctx),

		.cra_alignmask		= AESNI_ALIGN - 1,

		.cra_module		= THIS_MODULE,

	},

}, {

	.init			= rfc4106_init,

	.exit			= rfc4106_exit,

	.setkey			= rfc4106_set_key,