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Commit d7295a8d authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: ixp4xx - Convert to new AEAD interface 



This patch converts ixp4xx to the new AEAD interface.  IV generation
has been removed since it's a purely software implementation.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 479bcc7c

drivers/crypto/ixp4xx_crypto.c

+158 −155
Original line number Diff line number Diff line
@@ -156,7 +156,8 @@ struct ablk_ctx { 
};



struct aead_ctx {

	struct buffer_desc *buffer;

	struct buffer_desc *src;

	struct buffer_desc *dst;

	struct scatterlist ivlist;

	/* used when the hmac is not on one sg entry */

	u8 *hmac_virt;
@@ -198,6 +199,15 @@ struct ixp_alg { 
	int registered;

};



struct ixp_aead_alg {

	struct aead_alg crypto;

	const struct ix_hash_algo *hash;

	u32 cfg_enc;

	u32 cfg_dec;



	int registered;

};



static const struct ix_hash_algo hash_alg_md5 = {

	.cfgword	= 0xAA010004,

	.icv		= "\x01\x23\x45\x67\x89\xAB\xCD\xEF"
@@ -339,11 +349,11 @@ static void finish_scattered_hmac(struct crypt_ctl *crypt) 
	struct aead_ctx *req_ctx = aead_request_ctx(req);

	struct crypto_aead *tfm = crypto_aead_reqtfm(req);

	int authsize = crypto_aead_authsize(tfm);

	int decryptlen = req->cryptlen - authsize;

	int decryptlen = req->assoclen + req->cryptlen - authsize;



	if (req_ctx->encrypt) {

		scatterwalk_map_and_copy(req_ctx->hmac_virt,

			req->src, decryptlen, authsize, 1);

			req->dst, decryptlen, authsize, 1);

	}

	dma_pool_free(buffer_pool, req_ctx->hmac_virt, crypt->icv_rev_aes);

}
@@ -364,7 +374,8 @@ static void one_packet(dma_addr_t phys) 
		struct aead_request *req = crypt->data.aead_req;

		struct aead_ctx *req_ctx = aead_request_ctx(req);



		free_buf_chain(dev, req_ctx->buffer, crypt->src_buf);

		free_buf_chain(dev, req_ctx->src, crypt->src_buf);

		free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);

		if (req_ctx->hmac_virt) {

			finish_scattered_hmac(crypt);

		}
@@ -573,11 +584,10 @@ static int init_tfm_ablk(struct crypto_tfm *tfm) 
	return init_tfm(tfm);

}



static int init_tfm_aead(struct crypto_tfm *tfm)

static int init_tfm_aead(struct crypto_aead *tfm)

{

	crypto_aead_set_reqsize(__crypto_aead_cast(tfm),

				sizeof(struct aead_ctx));

	return init_tfm(tfm);

	crypto_aead_set_reqsize(tfm, sizeof(struct aead_ctx));

	return init_tfm(crypto_aead_tfm(tfm));

}



static void exit_tfm(struct crypto_tfm *tfm)
@@ -587,6 +597,11 @@ static void exit_tfm(struct crypto_tfm *tfm) 
	free_sa_dir(&ctx->decrypt);

}



static void exit_tfm_aead(struct crypto_aead *tfm)

{

	exit_tfm(crypto_aead_tfm(tfm));

}



static int register_chain_var(struct crypto_tfm *tfm, u8 xpad, u32 target,

		int init_len, u32 ctx_addr, const u8 *key, int key_len)

{
@@ -969,24 +984,6 @@ static int ablk_rfc3686_crypt(struct ablkcipher_request *req) 
	return ret;

}



static int hmac_inconsistent(struct scatterlist *sg, unsigned start,

		unsigned int nbytes)

{

	int offset = 0;



	if (!nbytes)

		return 0;



	for (;;) {

		if (start < offset + sg->length)

			break;



		offset += sg->length;

		sg = sg_next(sg);

	}

	return (start + nbytes > offset + sg->length);

}



static int aead_perform(struct aead_request *req, int encrypt,

		int cryptoffset, int eff_cryptlen, u8 *iv)

{
@@ -1002,6 +999,8 @@ static int aead_perform(struct aead_request *req, int encrypt, 
	struct device *dev = &pdev->dev;

	gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?

				GFP_KERNEL : GFP_ATOMIC;

	enum dma_data_direction src_direction = DMA_BIDIRECTIONAL;

	unsigned int lastlen;



	if (qmgr_stat_full(SEND_QID))

		return -EAGAIN;
@@ -1030,35 +1029,55 @@ static int aead_perform(struct aead_request *req, int encrypt, 
	crypt->crypt_len = eff_cryptlen;



	crypt->auth_offs = 0;

	crypt->auth_len = req->assoclen + ivsize + cryptlen;

	crypt->auth_len = req->assoclen + cryptlen;

	BUG_ON(ivsize && !req->iv);

	memcpy(crypt->iv, req->iv, ivsize);



	req_ctx->dst = NULL;



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

		BUG(); /* -ENOTSUP because of my laziness */

		struct buffer_desc dst_hook;



		crypt->mode |= NPE_OP_NOT_IN_PLACE;

		src_direction = DMA_TO_DEVICE;



		buf = chainup_buffers(dev, req->dst, crypt->auth_len,

				      &dst_hook, flags, DMA_FROM_DEVICE);

		req_ctx->dst = dst_hook.next;

		crypt->dst_buf = dst_hook.phys_next;



		if (!buf)

			goto free_buf_dst;



		if (encrypt) {

			lastlen = buf->buf_len;

			if (lastlen >= authsize)

				crypt->icv_rev_aes = buf->phys_addr +

						     buf->buf_len - authsize;

		}

	}



	/* ASSOC data */

	buf = chainup_buffers(dev, req->assoc, req->assoclen, &src_hook,

		flags, DMA_TO_DEVICE);

	req_ctx->buffer = src_hook.next;

	buf = chainup_buffers(dev, req->src, crypt->auth_len,

			      &src_hook, flags, src_direction);

	req_ctx->src = src_hook.next;

	crypt->src_buf = src_hook.phys_next;

	if (!buf)

		goto out;

	/* IV */

	sg_init_table(&req_ctx->ivlist, 1);

	sg_set_buf(&req_ctx->ivlist, iv, ivsize);

	buf = chainup_buffers(dev, &req_ctx->ivlist, ivsize, buf, flags,

			DMA_BIDIRECTIONAL);

	if (!buf)

		goto free_chain;

	if (unlikely(hmac_inconsistent(req->src, cryptlen, authsize))) {

		goto free_buf_src;



	if (!encrypt || !req_ctx->dst) {

		lastlen = buf->buf_len;

		if (lastlen >= authsize)

			crypt->icv_rev_aes = buf->phys_addr +

					     buf->buf_len - authsize;

	}



	if (unlikely(lastlen < authsize)) {

		/* The 12 hmac bytes are scattered,

		 * we need to copy them into a safe buffer */

		req_ctx->hmac_virt = dma_pool_alloc(buffer_pool, flags,

				&crypt->icv_rev_aes);

		if (unlikely(!req_ctx->hmac_virt))

			goto free_chain;

			goto free_buf_src;

		if (!encrypt) {

			scatterwalk_map_and_copy(req_ctx->hmac_virt,

				req->src, cryptlen, authsize, 0);
@@ -1067,27 +1086,16 @@ static int aead_perform(struct aead_request *req, int encrypt, 
	} else {

		req_ctx->hmac_virt = NULL;

	}

	/* Crypt */

	buf = chainup_buffers(dev, req->src, cryptlen + authsize, buf, flags,

			DMA_BIDIRECTIONAL);

	if (!buf)

		goto free_hmac_virt;

	if (!req_ctx->hmac_virt) {

		crypt->icv_rev_aes = buf->phys_addr + buf->buf_len - authsize;

	}



	crypt->ctl_flags |= CTL_FLAG_PERFORM_AEAD;

	qmgr_put_entry(SEND_QID, crypt_virt2phys(crypt));

	BUG_ON(qmgr_stat_overflow(SEND_QID));

	return -EINPROGRESS;

free_hmac_virt:

	if (req_ctx->hmac_virt) {

		dma_pool_free(buffer_pool, req_ctx->hmac_virt,

				crypt->icv_rev_aes);

	}

free_chain:

	free_buf_chain(dev, req_ctx->buffer, crypt->src_buf);

out:



free_buf_src:

	free_buf_chain(dev, req_ctx->src, crypt->src_buf);

free_buf_dst:

	free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);

	crypt->ctl_flags = CTL_FLAG_UNUSED;

	return -ENOMEM;

}
@@ -1173,40 +1181,12 @@ static int aead_setkey(struct crypto_aead *tfm, const u8 *key, 


static int aead_encrypt(struct aead_request *req)

{

	unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(req));

	return aead_perform(req, 1, req->assoclen + ivsize,

			req->cryptlen, req->iv);

	return aead_perform(req, 1, req->assoclen, req->cryptlen, req->iv);

}



static int aead_decrypt(struct aead_request *req)

{

	unsigned ivsize = crypto_aead_ivsize(crypto_aead_reqtfm(req));

	return aead_perform(req, 0, req->assoclen + ivsize,

			req->cryptlen, req->iv);

}



static int aead_givencrypt(struct aead_givcrypt_request *req)

{

	struct crypto_aead *tfm = aead_givcrypt_reqtfm(req);

	struct ixp_ctx *ctx = crypto_aead_ctx(tfm);

	unsigned len, ivsize = crypto_aead_ivsize(tfm);

	__be64 seq;



	/* copied from eseqiv.c */

	if (!ctx->salted) {

		get_random_bytes(ctx->salt, ivsize);

		ctx->salted = 1;

	}

	memcpy(req->areq.iv, ctx->salt, ivsize);

	len = ivsize;

	if (ivsize > sizeof(u64)) {

		memset(req->giv, 0, ivsize - sizeof(u64));

		len = sizeof(u64);

	}

	seq = cpu_to_be64(req->seq);

	memcpy(req->giv + ivsize - len, &seq, len);

	return aead_perform(&req->areq, 1, req->areq.assoclen,

			req->areq.cryptlen +ivsize, req->giv);

	return aead_perform(req, 0, req->assoclen, req->cryptlen, req->iv);

}



static struct ixp_alg ixp4xx_algos[] = {
@@ -1319,80 +1299,77 @@ static struct ixp_alg ixp4xx_algos[] = { 
	},

	.cfg_enc = CIPH_ENCR | MOD_AES | MOD_CTR,

	.cfg_dec = CIPH_ENCR | MOD_AES | MOD_CTR,

}, {

} };



static struct ixp_aead_alg ixp4xx_aeads[] = {

{

	.crypto	= {

		.base = {

			.cra_name	= "authenc(hmac(md5),cbc(des))",

			.cra_blocksize	= DES_BLOCK_SIZE,

		.cra_u		= { .aead = {

		},

		.ivsize		= DES_BLOCK_SIZE,

		.maxauthsize	= MD5_DIGEST_SIZE,

			}

		}

	},

	.hash = &hash_alg_md5,

	.cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,

	.cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,

}, {

	.crypto	= {

		.base = {

			.cra_name	= "authenc(hmac(md5),cbc(des3_ede))",

			.cra_blocksize	= DES3_EDE_BLOCK_SIZE,

		.cra_u		= { .aead = {

		},

		.ivsize		= DES3_EDE_BLOCK_SIZE,

		.maxauthsize	= MD5_DIGEST_SIZE,

			}

		}

	},

	.hash = &hash_alg_md5,

	.cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,

	.cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,

}, {

	.crypto	= {

		.base = {

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

			.cra_blocksize	= DES_BLOCK_SIZE,

		.cra_u		= { .aead = {

		},

			.ivsize		= DES_BLOCK_SIZE,

			.maxauthsize	= SHA1_DIGEST_SIZE,

			}

		}

	},

	.hash = &hash_alg_sha1,

	.cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,

	.cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,

}, {

	.crypto	= {

		.base = {

			.cra_name	= "authenc(hmac(sha1),cbc(des3_ede))",

			.cra_blocksize	= DES3_EDE_BLOCK_SIZE,

		.cra_u		= { .aead = {

		},

		.ivsize		= DES3_EDE_BLOCK_SIZE,

		.maxauthsize	= SHA1_DIGEST_SIZE,

			}

		}

	},

	.hash = &hash_alg_sha1,

	.cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,

	.cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,

}, {

	.crypto	= {

		.base = {

			.cra_name	= "authenc(hmac(md5),cbc(aes))",

			.cra_blocksize	= AES_BLOCK_SIZE,

		.cra_u		= { .aead = {

		},

		.ivsize		= AES_BLOCK_SIZE,

		.maxauthsize	= MD5_DIGEST_SIZE,

			}

		}

	},

	.hash = &hash_alg_md5,

	.cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,

	.cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,

}, {

	.crypto	= {

		.base = {

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

			.cra_blocksize	= AES_BLOCK_SIZE,

		.cra_u		= { .aead = {

		},

		.ivsize		= AES_BLOCK_SIZE,

		.maxauthsize	= SHA1_DIGEST_SIZE,

			}

		}

	},

	.hash = &hash_alg_sha1,

	.cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
@@ -1436,7 +1413,7 @@ static int __init ixp_module_init(void) 
		if (!support_aes && (ixp4xx_algos[i].cfg_enc & MOD_AES)) {

			continue;

		}

		if (!ixp4xx_algos[i].hash) {



		/* block ciphers */

		cra->cra_type = &crypto_ablkcipher_type;

		cra->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
@@ -1449,19 +1426,7 @@ static int __init ixp_module_init(void) 
		if (!cra->cra_ablkcipher.decrypt)

			cra->cra_ablkcipher.decrypt = ablk_decrypt;

		cra->cra_init = init_tfm_ablk;

		} else {

			/* authenc */

			cra->cra_type = &crypto_aead_type;

			cra->cra_flags = CRYPTO_ALG_TYPE_AEAD |

					 CRYPTO_ALG_KERN_DRIVER_ONLY |

					 CRYPTO_ALG_ASYNC;

			cra->cra_aead.setkey = aead_setkey;

			cra->cra_aead.setauthsize = aead_setauthsize;

			cra->cra_aead.encrypt = aead_encrypt;

			cra->cra_aead.decrypt = aead_decrypt;

			cra->cra_aead.givencrypt = aead_givencrypt;

			cra->cra_init = init_tfm_aead;

		}



		cra->cra_ctxsize = sizeof(struct ixp_ctx);

		cra->cra_module = THIS_MODULE;

		cra->cra_alignmask = 3;
@@ -1473,6 +1438,39 @@ static int __init ixp_module_init(void) 
		else

			ixp4xx_algos[i].registered = 1;

	}



	for (i = 0; i < ARRAY_SIZE(ixp4xx_aeads); i++) {

		struct aead_alg *cra = &ixp4xx_aeads[i].crypto;



		if (snprintf(cra->base.cra_driver_name, CRYPTO_MAX_ALG_NAME,

			     "%s"IXP_POSTFIX, cra->base.cra_name) >=

		    CRYPTO_MAX_ALG_NAME)

			continue;

		if (!support_aes && (ixp4xx_algos[i].cfg_enc & MOD_AES))

			continue;



		/* authenc */

		cra->base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |

				      CRYPTO_ALG_AEAD_NEW |

				      CRYPTO_ALG_ASYNC;

		cra->setkey = aead_setkey;

		cra->setauthsize = aead_setauthsize;

		cra->encrypt = aead_encrypt;

		cra->decrypt = aead_decrypt;

		cra->init = init_tfm_aead;

		cra->exit = exit_tfm_aead;



		cra->base.cra_ctxsize = sizeof(struct ixp_ctx);

		cra->base.cra_module = THIS_MODULE;

		cra->base.cra_alignmask = 3;

		cra->base.cra_priority = 300;



		if (crypto_register_aead(cra))

			printk(KERN_ERR "Failed to register '%s'\n",

				cra->base.cra_driver_name);

		else

			ixp4xx_aeads[i].registered = 1;

	}

	return 0;

}
@@ -1481,6 +1479,11 @@ static void __exit ixp_module_exit(void) 
	int num = ARRAY_SIZE(ixp4xx_algos);

	int i;



	for (i = 0; i < ARRAY_SIZE(ixp4xx_aeads); i++) {

		if (ixp4xx_aeads[i].registered)

			crypto_unregister_aead(&ixp4xx_aeads[i].crypto);

	}



	for (i=0; i< num; i++) {

		if (ixp4xx_algos[i].registered)

			crypto_unregister_alg(&ixp4xx_algos[i].crypto);