/* * Authenc: Simple AEAD wrapper for IPsec * * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include <crypto/internal/aead.h>#include <crypto/internal/hash.h>#include <crypto/internal/skcipher.h>#include <crypto/authenc.h>#include <crypto/null.h>#include <crypto/scatterwalk.h>#include <linux/err.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/rtnetlink.h>#include <linux/slab.h>#include <linux/spinlock.h> struct authenc_instance_ctx {	struct crypto_ahash_spawn auth;	struct crypto_skcipher_spawn enc;	unsigned int reqoff;}; struct crypto_authenc_ctx {	struct crypto_ahash *auth;	struct crypto_skcipher *enc;	struct crypto_skcipher *null;}; struct authenc_request_ctx {	struct scatterlist src[2];	struct scatterlist dst[2];	char tail[];}; static void authenc_request_complete(struct aead_request *req, int err){	if (err != -EINPROGRESS)		aead_request_complete(req, err);} int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key,			       unsigned int keylen){	struct rtattr *rta = (struct rtattr *)key;	struct crypto_authenc_key_param *param; 	if (!RTA_OK(rta, keylen))		return -EINVAL;	if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)		return -EINVAL;	if (RTA_PAYLOAD(rta) < sizeof(*param))		return -EINVAL; 	param = RTA_DATA(rta);	keys->enckeylen = be32_to_cpu(param->enckeylen); 	key += RTA_ALIGN(rta->rta_len);	keylen -= RTA_ALIGN(rta->rta_len); 	if (keylen < keys->enckeylen)		return -EINVAL; 	keys->authkeylen = keylen - keys->enckeylen;	keys->authkey = key;	keys->enckey = key + keys->authkeylen; 	return 0;}EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys); static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,				 unsigned int keylen){	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);	struct crypto_ahash *auth = ctx->auth;	struct crypto_skcipher *enc = ctx->enc;	struct crypto_authenc_keys keys;	int err = -EINVAL; 	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)		goto badkey; 	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_ahash_setkey(auth, keys.authkey, keys.authkeylen);	crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &				       CRYPTO_TFM_RES_MASK); 	if (err)		goto out; 	crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);	crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc) &				       CRYPTO_TFM_REQ_MASK);	err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);	crypto_aead_set_flags(authenc, crypto_skcipher_get_flags(enc) &				       CRYPTO_TFM_RES_MASK); out:	return err; badkey:	crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);	goto out;} 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 aead_instance *inst = aead_alg_instance(authenc);	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); 	if (err)		goto out; 	scatterwalk_map_and_copy(ahreq->result, req->dst,				 req->assoclen + req->cryptlen,				 crypto_aead_authsize(authenc), 1); out:	aead_request_complete(req, err);} static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags){	struct crypto_aead *authenc = crypto_aead_reqtfm(req);	struct aead_instance *inst = aead_alg_instance(authenc);	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);	struct crypto_ahash *auth = ctx->auth;	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->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, req->dst, hash,				req->assoclen + req->cryptlen);	ahash_request_set_callback(ahreq, flags,				   authenc_geniv_ahash_done, req); 	err = crypto_ahash_digest(ahreq);	if (err)		return err; 	scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen,				 crypto_aead_authsize(authenc), 1); 	return 0;} static void crypto_authenc_encrypt_done(struct crypto_async_request *req,					int err){	struct aead_request *areq = req->data; 	if (err)		goto out; 	err = crypto_authenc_genicv(areq, 0); out:	authenc_request_complete(areq, err);} static int crypto_authenc_copy_assoc(struct aead_request *req){	struct crypto_aead *authenc = crypto_aead_reqtfm(req);	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);	SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null); 	skcipher_request_set_tfm(skreq, ctx->null);	skcipher_request_set_callback(skreq, aead_request_flags(req),				      NULL, NULL);	skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen,				   NULL); 	return crypto_skcipher_encrypt(skreq);} static int crypto_authenc_encrypt(struct aead_request *req){	struct crypto_aead *authenc = crypto_aead_reqtfm(req);	struct aead_instance *inst = aead_alg_instance(authenc);	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);	struct crypto_skcipher *enc = ctx->enc;	unsigned int cryptlen = req->cryptlen;	struct skcipher_request *skreq = (void *)(areq_ctx->tail +						  ictx->reqoff);	struct scatterlist *src, *dst;	int err; 	src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);	dst = src; 	if (req->src != req->dst) {		err = crypto_authenc_copy_assoc(req);		if (err)			return err; 		dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);	} 	skcipher_request_set_tfm(skreq, enc);	skcipher_request_set_callback(skreq, aead_request_flags(req),				      crypto_authenc_encrypt_done, req);	skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv); 	err = crypto_skcipher_encrypt(skreq);	if (err)		return err; 	return crypto_authenc_genicv(req, aead_request_flags(req));} static int crypto_authenc_decrypt_tail(struct aead_request *req,				       unsigned int flags){	struct crypto_aead *authenc = crypto_aead_reqtfm(req);	struct aead_instance *inst = aead_alg_instance(authenc);	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);	struct skcipher_request *skreq = (void *)(areq_ctx->tail +						  ictx->reqoff);	unsigned int authsize = crypto_aead_authsize(authenc);	u8 *ihash = ahreq->result + authsize;	struct scatterlist *src, *dst; 	scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0); 	if (crypto_memneq(ihash, ahreq->result, authsize))		return -EBADMSG; 	src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);	dst = src; 	if (req->src != req->dst)		dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); 	skcipher_request_set_tfm(skreq, ctx->enc);	skcipher_request_set_callback(skreq, aead_request_flags(req),				      req->base.complete, req->base.data);	skcipher_request_set_crypt(skreq, src, dst,				   req->cryptlen - authsize, req->iv); 	return crypto_skcipher_decrypt(skreq);} static void authenc_verify_ahash_done(struct crypto_async_request *areq,				      int err){	struct aead_request *req = areq->data; 	if (err)		goto out; 	err = crypto_authenc_decrypt_tail(req, 0); out:	authenc_request_complete(req, err);} static int crypto_authenc_decrypt(struct aead_request *req){	struct crypto_aead *authenc = crypto_aead_reqtfm(req);	unsigned int authsize = crypto_aead_authsize(authenc);	struct aead_instance *inst = aead_alg_instance(authenc);	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);	struct crypto_ahash *auth = ctx->auth;	struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);	struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->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, req->src, hash,				req->assoclen + req->cryptlen - authsize);	ahash_request_set_callback(ahreq, aead_request_flags(req),				   authenc_verify_ahash_done, req); 	err = crypto_ahash_digest(ahreq);	if (err)		return err; 	return crypto_authenc_decrypt_tail(req, aead_request_flags(req));} static int crypto_authenc_init_tfm(struct crypto_aead *tfm){	struct aead_instance *inst = aead_alg_instance(tfm);	struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);	struct crypto_ahash *auth;	struct crypto_skcipher *enc;	struct crypto_skcipher *null;	int err; 	auth = crypto_spawn_ahash(&ictx->auth);	if (IS_ERR(auth))		return PTR_ERR(auth); 	enc = crypto_spawn_skcipher(&ictx->enc);	err = PTR_ERR(enc);	if (IS_ERR(enc))		goto err_free_ahash; 	null = crypto_get_default_null_skcipher2();	err = PTR_ERR(null);	if (IS_ERR(null))		goto err_free_skcipher; 	ctx->auth = auth;	ctx->enc = enc;	ctx->null = null; 	crypto_aead_set_reqsize(		tfm,		sizeof(struct authenc_request_ctx) +		ictx->reqoff +		max_t(unsigned int,		      crypto_ahash_reqsize(auth) +		      sizeof(struct ahash_request),		      sizeof(struct skcipher_request) +		      crypto_skcipher_reqsize(enc))); 	return 0; err_free_skcipher:	crypto_free_skcipher(enc);err_free_ahash:	crypto_free_ahash(auth);	return err;} static void crypto_authenc_exit_tfm(struct crypto_aead *tfm){	struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm); 	crypto_free_ahash(ctx->auth);	crypto_free_skcipher(ctx->enc);	crypto_put_default_null_skcipher2();} static void crypto_authenc_free(struct aead_instance *inst){	struct authenc_instance_ctx *ctx = aead_instance_ctx(inst); 	crypto_drop_skcipher(&ctx->enc);	crypto_drop_ahash(&ctx->auth);	kfree(inst);} static int crypto_authenc_create(struct crypto_template *tmpl,				 struct rtattr **tb){	struct crypto_attr_type *algt;	struct aead_instance *inst;	struct hash_alg_common *auth;	struct crypto_alg *auth_base;	struct skcipher_alg *enc;	struct authenc_instance_ctx *ctx;	const char *enc_name;	int err; 	algt = crypto_get_attr_type(tb);	if (IS_ERR(algt))		return PTR_ERR(algt); 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)		return -EINVAL; 	auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,			      CRYPTO_ALG_TYPE_AHASH_MASK |			      crypto_requires_sync(algt->type, algt->mask));	if (IS_ERR(auth))		return 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))		goto out_put_auth; 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);	err = -ENOMEM;	if (!inst)		goto out_put_auth; 	ctx = aead_instance_ctx(inst); 	err = crypto_init_ahash_spawn(&ctx->auth, auth,				      aead_crypto_instance(inst));	if (err)		goto err_free_inst; 	crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));	err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,				   crypto_requires_sync(algt->type,							algt->mask));	if (err)		goto err_drop_auth; 	enc = crypto_spawn_skcipher_alg(&ctx->enc); 	ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask,			    auth_base->cra_alignmask + 1); 	err = -ENAMETOOLONG;	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,		     "authenc(%s,%s)", auth_base->cra_name,		     enc->base.cra_name) >=	    CRYPTO_MAX_ALG_NAME)		goto err_drop_enc; 	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,		     "authenc(%s,%s)", auth_base->cra_driver_name,		     enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)		goto err_drop_enc; 	inst->alg.base.cra_flags = (auth_base->cra_flags |				    enc->base.cra_flags) & CRYPTO_ALG_ASYNC;	inst->alg.base.cra_priority = enc->base.cra_priority * 10 +				      auth_base->cra_priority;	inst->alg.base.cra_blocksize = enc->base.cra_blocksize;	inst->alg.base.cra_alignmask = auth_base->cra_alignmask |				       enc->base.cra_alignmask;	inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx); 	inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);	inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);	inst->alg.maxauthsize = auth->digestsize; 	inst->alg.init = crypto_authenc_init_tfm;	inst->alg.exit = crypto_authenc_exit_tfm; 	inst->alg.setkey = crypto_authenc_setkey;	inst->alg.encrypt = crypto_authenc_encrypt;	inst->alg.decrypt = crypto_authenc_decrypt; 	inst->free = crypto_authenc_free; 	err = aead_register_instance(tmpl, inst);	if (err)		goto err_drop_enc; out:	crypto_mod_put(auth_base);	return err; err_drop_enc:	crypto_drop_skcipher(&ctx->enc);err_drop_auth:	crypto_drop_ahash(&ctx->auth);err_free_inst:	kfree(inst);out_put_auth:	goto out;} static struct crypto_template crypto_authenc_tmpl = {	.name = "authenc",	.create = crypto_authenc_create,	.module = THIS_MODULE,}; static int __init crypto_authenc_module_init(void){	return crypto_register_template(&crypto_authenc_tmpl);} static void __exit crypto_authenc_module_exit(void){	crypto_unregister_template(&crypto_authenc_tmpl);}

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