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Commit cbdcf80d authored by Steffen Klassert's avatar Steffen Klassert Committed by Herbert Xu
Browse files

crypto: authenc - Convert to ahash 



This patch converts authenc to the new ahash interface.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent ab300465

crypto/authenc.c

+285 −69
Original line number Diff line number Diff line
@@ -23,24 +23,36 @@ 
#include <linux/slab.h>

#include <linux/spinlock.h>



typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags);



struct authenc_instance_ctx {

	struct crypto_spawn auth;

	struct crypto_ahash_spawn auth;

	struct crypto_skcipher_spawn enc;

};



struct crypto_authenc_ctx {

	spinlock_t auth_lock;

	struct crypto_hash *auth;

	unsigned int reqoff;

	struct crypto_ahash *auth;

	struct crypto_ablkcipher *enc;

};



struct authenc_request_ctx {

	unsigned int cryptlen;

	struct scatterlist *sg;

	struct scatterlist asg[2];

	struct scatterlist cipher[2];

	crypto_completion_t complete;

	crypto_completion_t update_complete;

	char tail[];

};



static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,

				 unsigned int keylen)

{

	unsigned int authkeylen;

	unsigned int enckeylen;

	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);

	struct crypto_hash *auth = ctx->auth;

	struct crypto_ahash *auth = ctx->auth;

	struct crypto_ablkcipher *enc = ctx->enc;

	struct rtattr *rta = (void *)key;

	struct crypto_authenc_key_param *param;
@@ -64,11 +76,11 @@ static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, 


	authkeylen = keylen - enckeylen;



	crypto_hash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);

	crypto_hash_set_flags(auth, crypto_aead_get_flags(authenc) &

	crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);

	crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &

				    CRYPTO_TFM_REQ_MASK);

	err = crypto_hash_setkey(auth, key, authkeylen);

	crypto_aead_set_flags(authenc, crypto_hash_get_flags(auth) &

	err = crypto_ahash_setkey(auth, key, authkeylen);

	crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &

				       CRYPTO_TFM_RES_MASK);



	if (err)
@@ -103,40 +115,198 @@ static void authenc_chain(struct scatterlist *head, struct scatterlist *sg, 
		sg_mark_end(head);

}



static u8 *crypto_authenc_hash(struct aead_request *req, unsigned int flags,

			       struct scatterlist *cipher,

			       unsigned int cryptlen)

static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,

					    int err)

{

	struct aead_request *req = areq->data;

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);

	struct crypto_hash *auth = ctx->auth;

	struct hash_desc desc = {

		.tfm = auth,

		.flags = aead_request_flags(req) & flags,

	};

	u8 *hash = aead_request_ctx(req);

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);



	if (err)

		goto out;



	ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,

				areq_ctx->cryptlen);

	ahash_request_set_callback(ahreq, aead_request_flags(req) &

					  CRYPTO_TFM_REQ_MAY_SLEEP,

				   areq_ctx->complete, req);



	err = crypto_ahash_finup(ahreq);

	if (err)

		goto out;



	scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,

				 areq_ctx->cryptlen,

				 crypto_aead_authsize(authenc), 1);



out:

	aead_request_complete(req, err);

}



static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)

{

	struct aead_request *req = areq->data;

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);



	if (err)

		goto out;



	scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,

				 areq_ctx->cryptlen,

				 crypto_aead_authsize(authenc), 1);



out:

	aead_request_complete(req, err);

}



static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,

					     int err)

{

	u8 *ihash;

	unsigned int authsize;

	struct ablkcipher_request *abreq;

	struct aead_request *req = areq->data;

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);



	if (err)

		goto out;



	ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,

				areq_ctx->cryptlen);

	ahash_request_set_callback(ahreq, aead_request_flags(req) &

					  CRYPTO_TFM_REQ_MAY_SLEEP,

				   areq_ctx->complete, req);



	err = crypto_ahash_finup(ahreq);

	if (err)

		goto out;



	authsize = crypto_aead_authsize(authenc);

	ihash = ahreq->result + authsize;

	scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,

				 authsize, 0);



	err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;

	if (err)

		goto out;



	abreq = aead_request_ctx(req);

	ablkcipher_request_set_tfm(abreq, ctx->enc);

	ablkcipher_request_set_callback(abreq, aead_request_flags(req),

					req->base.complete, req->base.data);

	ablkcipher_request_set_crypt(abreq, req->src, req->dst,

				     req->cryptlen, req->iv);



	err = crypto_ablkcipher_decrypt(abreq);



out:

	aead_request_complete(req, err);

}



static void authenc_verify_ahash_done(struct crypto_async_request *areq,

				      int err)

{

	u8 *ihash;

	unsigned int authsize;

	struct ablkcipher_request *abreq;

	struct aead_request *req = areq->data;

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);



	if (err)

		goto out;



	authsize = crypto_aead_authsize(authenc);

	ihash = ahreq->result + authsize;

	scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,

				 authsize, 0);



	err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;

	if (err)

		goto out;



	abreq = aead_request_ctx(req);

	ablkcipher_request_set_tfm(abreq, ctx->enc);

	ablkcipher_request_set_callback(abreq, aead_request_flags(req),

					req->base.complete, req->base.data);

	ablkcipher_request_set_crypt(abreq, req->src, req->dst,

				     req->cryptlen, req->iv);



	err = crypto_ablkcipher_decrypt(abreq);



out:

	aead_request_complete(req, err);

}



static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)

{

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);

	struct crypto_ahash *auth = ctx->auth;

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);

	u8 *hash = areq_ctx->tail;

	int err;



	hash = (u8 *)ALIGN((unsigned long)hash + crypto_hash_alignmask(auth), 

			   crypto_hash_alignmask(auth) + 1);

	hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),

			    crypto_ahash_alignmask(auth) + 1);



	ahash_request_set_tfm(ahreq, auth);



	spin_lock_bh(&ctx->auth_lock);

	err = crypto_hash_init(&desc);

	err = crypto_ahash_init(ahreq);

	if (err)

		goto auth_unlock;

		return ERR_PTR(err);



	ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);

	ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,

				   areq_ctx->update_complete, req);



	err = crypto_hash_update(&desc, req->assoc, req->assoclen);

	err = crypto_ahash_update(ahreq);

	if (err)

		goto auth_unlock;

		return ERR_PTR(err);



	ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,

				areq_ctx->cryptlen);

	ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,

				   areq_ctx->complete, req);



	err = crypto_hash_update(&desc, cipher, cryptlen);

	err = crypto_ahash_finup(ahreq);

	if (err)

		goto auth_unlock;

		return ERR_PTR(err);



	err = crypto_hash_final(&desc, hash);

auth_unlock:

	spin_unlock_bh(&ctx->auth_lock);

	return hash;

}



static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)

{

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);

	struct crypto_ahash *auth = ctx->auth;

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);

	u8 *hash = areq_ctx->tail;

	int err;



	hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),

			   crypto_ahash_alignmask(auth) + 1);



	ahash_request_set_tfm(ahreq, auth);

	ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,

				areq_ctx->cryptlen);

	ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,

				   areq_ctx->complete, req);



	err = crypto_ahash_digest(ahreq);

	if (err)

		return ERR_PTR(err);
@@ -147,11 +317,15 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, 
				 unsigned int flags)

{

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct scatterlist *dst = req->dst;

	struct scatterlist cipher[2];

	struct page *dstp;

	struct scatterlist *assoc = req->assoc;

	struct scatterlist *cipher = areq_ctx->cipher;

	struct scatterlist *asg = areq_ctx->asg;

	unsigned int ivsize = crypto_aead_ivsize(authenc);

	unsigned int cryptlen;

	unsigned int cryptlen = req->cryptlen;

	authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;

	struct page *dstp;

	u8 *vdst;

	u8 *hash;
@@ -163,10 +337,25 @@ static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, 
		sg_set_buf(cipher, iv, ivsize);

		authenc_chain(cipher, dst, vdst == iv + ivsize);

		dst = cipher;

		cryptlen += ivsize;

	}



	if (sg_is_last(assoc)) {

		authenc_ahash_fn = crypto_authenc_ahash;

		sg_init_table(asg, 2);

		sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);

		authenc_chain(asg, dst, 0);

		dst = asg;

		cryptlen += req->assoclen;

	}



	cryptlen = req->cryptlen + ivsize;

	hash = crypto_authenc_hash(req, flags, dst, cryptlen);

	areq_ctx->cryptlen = cryptlen;

	areq_ctx->sg = dst;



	areq_ctx->complete = authenc_geniv_ahash_done;

	areq_ctx->update_complete = authenc_geniv_ahash_update_done;



	hash = authenc_ahash_fn(req, flags);

	if (IS_ERR(hash))

		return PTR_ERR(hash);
@@ -256,22 +445,25 @@ static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) 
}



static int crypto_authenc_verify(struct aead_request *req,

				 struct scatterlist *cipher,

				 unsigned int cryptlen)

				 authenc_ahash_t authenc_ahash_fn)

{

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	u8 *ohash;

	u8 *ihash;

	unsigned int authsize;



	ohash = crypto_authenc_hash(req, CRYPTO_TFM_REQ_MAY_SLEEP, cipher,

				    cryptlen);

	areq_ctx->complete = authenc_verify_ahash_done;

	areq_ctx->complete = authenc_verify_ahash_update_done;



	ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);

	if (IS_ERR(ohash))

		return PTR_ERR(ohash);



	authsize = crypto_aead_authsize(authenc);

	ihash = ohash + authsize;

	scatterwalk_map_and_copy(ihash, cipher, cryptlen, authsize, 0);

	scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,

				 authsize, 0);

	return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;

}
@@ -279,10 +471,14 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, 
				  unsigned int cryptlen)

{

	struct crypto_aead *authenc = crypto_aead_reqtfm(req);

	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);

	struct scatterlist *src = req->src;

	struct scatterlist cipher[2];

	struct page *srcp;

	struct scatterlist *assoc = req->assoc;

	struct scatterlist *cipher = areq_ctx->cipher;

	struct scatterlist *asg = areq_ctx->asg;

	unsigned int ivsize = crypto_aead_ivsize(authenc);

	authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;

	struct page *srcp;

	u8 *vsrc;



	srcp = sg_page(src);
@@ -293,9 +489,22 @@ static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, 
		sg_set_buf(cipher, iv, ivsize);

		authenc_chain(cipher, src, vsrc == iv + ivsize);

		src = cipher;

		cryptlen += ivsize;

	}



	return crypto_authenc_verify(req, src, cryptlen + ivsize);

	if (sg_is_last(assoc)) {

		authenc_ahash_fn = crypto_authenc_ahash;

		sg_init_table(asg, 2);

		sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);

		authenc_chain(asg, src, 0);

		src = asg;

		cryptlen += req->assoclen;

	}



	areq_ctx->cryptlen = cryptlen;

	areq_ctx->sg = src;



	return crypto_authenc_verify(req, authenc_ahash_fn);

}



static int crypto_authenc_decrypt(struct aead_request *req)
@@ -326,38 +535,41 @@ static int crypto_authenc_decrypt(struct aead_request *req) 


static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)

{

	struct crypto_instance *inst = (void *)tfm->__crt_alg;

	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);

	struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);

	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);

	struct crypto_hash *auth;

	struct crypto_ahash *auth;

	struct crypto_ablkcipher *enc;

	int err;



	auth = crypto_spawn_hash(&ictx->auth);

	auth = crypto_spawn_ahash(&ictx->auth);

	if (IS_ERR(auth))

		return PTR_ERR(auth);



	ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +

			    crypto_ahash_alignmask(auth),

			    crypto_ahash_alignmask(auth) + 1);



	enc = crypto_spawn_skcipher(&ictx->enc);

	err = PTR_ERR(enc);

	if (IS_ERR(enc))

		goto err_free_hash;

		goto err_free_ahash;



	ctx->auth = auth;

	ctx->enc = enc;

	

	tfm->crt_aead.reqsize = max_t(unsigned int,

				      (crypto_hash_alignmask(auth) &

				       ~(crypto_tfm_ctx_alignment() - 1)) +

				      crypto_hash_digestsize(auth) * 2,

				crypto_ahash_reqsize(auth) + ctx->reqoff +

				sizeof(struct authenc_request_ctx) +

				sizeof(struct ahash_request), 

				sizeof(struct skcipher_givcrypt_request) +

				crypto_ablkcipher_reqsize(enc) +

				crypto_ablkcipher_ivsize(enc));



	spin_lock_init(&ctx->auth_lock);



	return 0;



err_free_hash:

	crypto_free_hash(auth);

err_free_ahash:

	crypto_free_ahash(auth);

	return err;

}
@@ -365,7 +577,7 @@ static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) 
{

	struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);



	crypto_free_hash(ctx->auth);

	crypto_free_ahash(ctx->auth);

	crypto_free_ablkcipher(ctx->enc);

}
@@ -373,7 +585,8 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) 
{

	struct crypto_attr_type *algt;

	struct crypto_instance *inst;

	struct crypto_alg *auth;

	struct hash_alg_common *auth;

	struct crypto_alg *auth_base;

	struct crypto_alg *enc;

	struct authenc_instance_ctx *ctx;

	const char *enc_name;
@@ -387,11 +600,13 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) 
	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)

		return ERR_PTR(-EINVAL);



	auth = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,

			       CRYPTO_ALG_TYPE_HASH_MASK);

	auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,

			       CRYPTO_ALG_TYPE_AHASH_MASK);

	if (IS_ERR(auth))

		return ERR_PTR(PTR_ERR(auth));



	auth_base = &auth->base;



	enc_name = crypto_attr_alg_name(tb[2]);

	err = PTR_ERR(enc_name);

	if (IS_ERR(enc_name))
@@ -404,7 +619,7 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) 


	ctx = crypto_instance_ctx(inst);



	err = crypto_init_spawn(&ctx->auth, auth, inst, CRYPTO_ALG_TYPE_MASK);

	err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);

	if (err)

		goto err_free_inst;
@@ -419,24 +634,25 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) 


	err = -ENAMETOOLONG;

	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,

		     "authenc(%s,%s)", auth->cra_name, enc->cra_name) >=

		     "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=

	    CRYPTO_MAX_ALG_NAME)

		goto err_drop_enc;



	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,

		     "authenc(%s,%s)", auth->cra_driver_name,

		     "authenc(%s,%s)", auth_base->cra_driver_name,

		     enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)

		goto err_drop_enc;



	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;

	inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;

	inst->alg.cra_priority = enc->cra_priority * 10 + auth->cra_priority;

	inst->alg.cra_priority = enc->cra_priority *

				 10 + auth_base->cra_priority;

	inst->alg.cra_blocksize = enc->cra_blocksize;

	inst->alg.cra_alignmask = auth->cra_alignmask | enc->cra_alignmask;

	inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;

	inst->alg.cra_type = &crypto_aead_type;



	inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;

	inst->alg.cra_aead.maxauthsize = __crypto_shash_alg(auth)->digestsize;

	inst->alg.cra_aead.maxauthsize = auth->digestsize;



	inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
@@ -449,13 +665,13 @@ static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) 
	inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;



out:

	crypto_mod_put(auth);

	crypto_mod_put(auth_base);

	return inst;



err_drop_enc:

	crypto_drop_skcipher(&ctx->enc);

err_drop_auth:

	crypto_drop_spawn(&ctx->auth);

	crypto_drop_ahash(&ctx->auth);

err_free_inst:

	kfree(inst);

out_put_auth:
@@ -468,7 +684,7 @@ static void crypto_authenc_free(struct crypto_instance *inst) 
	struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);



	crypto_drop_skcipher(&ctx->enc);

	crypto_drop_spawn(&ctx->auth);

	crypto_drop_ahash(&ctx->auth);

	kfree(inst);

}