/* * AEAD: Authenticated Encryption with Associated Data * * This file provides API support for AEAD algorithms. * * Copyright (c) 2007 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 <linux/err.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/rtnetlink.h>#include <linux/sched.h>#include <linux/slab.h>#include <linux/seq_file.h>#include <linux/cryptouser.h>#include <net/netlink.h> #include "internal.h" static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,			    unsigned int keylen){	struct aead_alg *aead = crypto_aead_alg(tfm);	unsigned long alignmask = crypto_aead_alignmask(tfm);	int ret;	u8 *buffer, *alignbuffer;	unsigned long absize; 	absize = keylen + alignmask;	buffer = kmalloc(absize, GFP_ATOMIC);	if (!buffer)		return -ENOMEM; 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);	memcpy(alignbuffer, key, keylen);	ret = aead->setkey(tfm, alignbuffer, keylen);	memset(alignbuffer, 0, keylen);	kfree(buffer);	return ret;} static int setkey(struct crypto_aead *tfm, const u8 *key, unsigned int keylen){	struct aead_alg *aead = crypto_aead_alg(tfm);	unsigned long alignmask = crypto_aead_alignmask(tfm); 	if ((unsigned long)key & alignmask)		return setkey_unaligned(tfm, key, keylen); 	return aead->setkey(tfm, key, keylen);} int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize){	struct aead_tfm *crt = crypto_aead_crt(tfm);	int err; 	if (authsize > crypto_aead_alg(tfm)->maxauthsize)		return -EINVAL; 	if (crypto_aead_alg(tfm)->setauthsize) {		err = crypto_aead_alg(tfm)->setauthsize(crt->base, authsize);		if (err)			return err;	} 	crypto_aead_crt(crt->base)->authsize = authsize;	crt->authsize = authsize;	return 0;}EXPORT_SYMBOL_GPL(crypto_aead_setauthsize); static unsigned int crypto_aead_ctxsize(struct crypto_alg *alg, u32 type,					u32 mask){	return alg->cra_ctxsize;} static int no_givcrypt(struct aead_givcrypt_request *req){	return -ENOSYS;} static int crypto_init_aead_ops(struct crypto_tfm *tfm, u32 type, u32 mask){	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;	struct aead_tfm *crt = &tfm->crt_aead; 	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)		return -EINVAL; 	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?		      alg->setkey : setkey;	crt->encrypt = alg->encrypt;	crt->decrypt = alg->decrypt;	crt->givencrypt = alg->givencrypt ?: no_givcrypt;	crt->givdecrypt = alg->givdecrypt ?: no_givcrypt;	crt->base = __crypto_aead_cast(tfm);	crt->ivsize = alg->ivsize;	crt->authsize = alg->maxauthsize; 	return 0;} #ifdef CONFIG_NETstatic int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg){	struct crypto_report_aead raead;	struct aead_alg *aead = &alg->cra_aead; 	snprintf(raead.type, CRYPTO_MAX_ALG_NAME, "%s", "aead");	snprintf(raead.geniv, CRYPTO_MAX_ALG_NAME, "%s",		 aead->geniv ?: "<built-in>"); 	raead.blocksize = alg->cra_blocksize;	raead.maxauthsize = aead->maxauthsize;	raead.ivsize = aead->ivsize; 	if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,		    sizeof(struct crypto_report_aead), &raead))		goto nla_put_failure;	return 0; nla_put_failure:	return -EMSGSIZE;}#elsestatic int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg){	return -ENOSYS;}#endif static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)	__attribute__ ((unused));static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg){	struct aead_alg *aead = &alg->cra_aead; 	seq_printf(m, "type         : aead\n");	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?					     "yes" : "no");	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);	seq_printf(m, "ivsize       : %u\n", aead->ivsize);	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);	seq_printf(m, "geniv        : %s\n", aead->geniv ?: "<built-in>");} const struct crypto_type crypto_aead_type = {	.ctxsize = crypto_aead_ctxsize,	.init = crypto_init_aead_ops,#ifdef CONFIG_PROC_FS	.show = crypto_aead_show,#endif	.report = crypto_aead_report,};EXPORT_SYMBOL_GPL(crypto_aead_type); static int aead_null_givencrypt(struct aead_givcrypt_request *req){	return crypto_aead_encrypt(&req->areq);} static int aead_null_givdecrypt(struct aead_givcrypt_request *req){	return crypto_aead_decrypt(&req->areq);} static int crypto_init_nivaead_ops(struct crypto_tfm *tfm, u32 type, u32 mask){	struct aead_alg *alg = &tfm->__crt_alg->cra_aead;	struct aead_tfm *crt = &tfm->crt_aead; 	if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8)		return -EINVAL; 	crt->setkey = setkey;	crt->encrypt = alg->encrypt;	crt->decrypt = alg->decrypt;	if (!alg->ivsize) {		crt->givencrypt = aead_null_givencrypt;		crt->givdecrypt = aead_null_givdecrypt;	}	crt->base = __crypto_aead_cast(tfm);	crt->ivsize = alg->ivsize;	crt->authsize = alg->maxauthsize; 	return 0;} #ifdef CONFIG_NETstatic int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg){	struct crypto_report_aead raead;	struct aead_alg *aead = &alg->cra_aead; 	snprintf(raead.type, CRYPTO_MAX_ALG_NAME, "%s", "nivaead");	snprintf(raead.geniv, CRYPTO_MAX_ALG_NAME, "%s", aead->geniv); 	raead.blocksize = alg->cra_blocksize;	raead.maxauthsize = aead->maxauthsize;	raead.ivsize = aead->ivsize; 	if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD,		    sizeof(struct crypto_report_aead), &raead))		goto nla_put_failure;	return 0; nla_put_failure:	return -EMSGSIZE;}#elsestatic int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg){	return -ENOSYS;}#endif  static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg)	__attribute__ ((unused));static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg){	struct aead_alg *aead = &alg->cra_aead; 	seq_printf(m, "type         : nivaead\n");	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?					     "yes" : "no");	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);	seq_printf(m, "ivsize       : %u\n", aead->ivsize);	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);	seq_printf(m, "geniv        : %s\n", aead->geniv);} const struct crypto_type crypto_nivaead_type = {	.ctxsize = crypto_aead_ctxsize,	.init = crypto_init_nivaead_ops,#ifdef CONFIG_PROC_FS	.show = crypto_nivaead_show,#endif	.report = crypto_nivaead_report,};EXPORT_SYMBOL_GPL(crypto_nivaead_type); static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn,			       const char *name, u32 type, u32 mask){	struct crypto_alg *alg;	int err; 	type &= ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);	type |= CRYPTO_ALG_TYPE_AEAD;	mask |= CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV; 	alg = crypto_alg_mod_lookup(name, type, mask);	if (IS_ERR(alg))		return PTR_ERR(alg); 	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);	crypto_mod_put(alg);	return err;} struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl,					 struct rtattr **tb, u32 type,					 u32 mask){	const char *name;	struct crypto_aead_spawn *spawn;	struct crypto_attr_type *algt;	struct crypto_instance *inst;	struct crypto_alg *alg;	int err; 	algt = crypto_get_attr_type(tb);	err = PTR_ERR(algt);	if (IS_ERR(algt))		return ERR_PTR(err); 	if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) &	    algt->mask)		return ERR_PTR(-EINVAL); 	name = crypto_attr_alg_name(tb[1]);	err = PTR_ERR(name);	if (IS_ERR(name))		return ERR_PTR(err); 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);	if (!inst)		return ERR_PTR(-ENOMEM); 	spawn = crypto_instance_ctx(inst); 	/* Ignore async algorithms if necessary. */	mask |= crypto_requires_sync(algt->type, algt->mask); 	crypto_set_aead_spawn(spawn, inst);	err = crypto_grab_nivaead(spawn, name, type, mask);	if (err)		goto err_free_inst; 	alg = crypto_aead_spawn_alg(spawn); 	err = -EINVAL;	if (!alg->cra_aead.ivsize)		goto err_drop_alg; 	/*	 * This is only true if we're constructing an algorithm with its	 * default IV generator.  For the default generator we elide the	 * template name and double-check the IV generator.	 */	if (algt->mask & CRYPTO_ALG_GENIV) {		if (strcmp(tmpl->name, alg->cra_aead.geniv))			goto err_drop_alg; 		memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);		memcpy(inst->alg.cra_driver_name, alg->cra_driver_name,		       CRYPTO_MAX_ALG_NAME);	} else {		err = -ENAMETOOLONG;		if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,			     "%s(%s)", tmpl->name, alg->cra_name) >=		    CRYPTO_MAX_ALG_NAME)			goto err_drop_alg;		if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,			     "%s(%s)", tmpl->name, alg->cra_driver_name) >=		    CRYPTO_MAX_ALG_NAME)			goto err_drop_alg;	} 	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV;	inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;	inst->alg.cra_priority = alg->cra_priority;	inst->alg.cra_blocksize = alg->cra_blocksize;	inst->alg.cra_alignmask = alg->cra_alignmask;	inst->alg.cra_type = &crypto_aead_type; 	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;	inst->alg.cra_aead.geniv = alg->cra_aead.geniv; 	inst->alg.cra_aead.setkey = alg->cra_aead.setkey;	inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize;	inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt;	inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt; out:	return inst; err_drop_alg:	crypto_drop_aead(spawn);err_free_inst:	kfree(inst);	inst = ERR_PTR(err);	goto out;}EXPORT_SYMBOL_GPL(aead_geniv_alloc); void aead_geniv_free(struct crypto_instance *inst){	crypto_drop_aead(crypto_instance_ctx(inst));	kfree(inst);}EXPORT_SYMBOL_GPL(aead_geniv_free); int aead_geniv_init(struct crypto_tfm *tfm){	struct crypto_instance *inst = (void *)tfm->__crt_alg;	struct crypto_aead *aead; 	aead = crypto_spawn_aead(crypto_instance_ctx(inst));	if (IS_ERR(aead))		return PTR_ERR(aead); 	tfm->crt_aead.base = aead;	tfm->crt_aead.reqsize += crypto_aead_reqsize(aead); 	return 0;}EXPORT_SYMBOL_GPL(aead_geniv_init); void aead_geniv_exit(struct crypto_tfm *tfm){	crypto_free_aead(tfm->crt_aead.base);}EXPORT_SYMBOL_GPL(aead_geniv_exit); static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask){	struct rtattr *tb[3];	struct {		struct rtattr attr;		struct crypto_attr_type data;	} ptype;	struct {		struct rtattr attr;		struct crypto_attr_alg data;	} palg;	struct crypto_template *tmpl;	struct crypto_instance *inst;	struct crypto_alg *larval;	const char *geniv;	int err; 	larval = crypto_larval_lookup(alg->cra_driver_name,				      CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV,				      CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV);	err = PTR_ERR(larval);	if (IS_ERR(larval))		goto out; 	err = -EAGAIN;	if (!crypto_is_larval(larval))		goto drop_larval; 	ptype.attr.rta_len = sizeof(ptype);	ptype.attr.rta_type = CRYPTOA_TYPE;	ptype.data.type = type | CRYPTO_ALG_GENIV;	/* GENIV tells the template that we're making a default geniv. */	ptype.data.mask = mask | CRYPTO_ALG_GENIV;	tb[0] = &ptype.attr; 	palg.attr.rta_len = sizeof(palg);	palg.attr.rta_type = CRYPTOA_ALG;	/* Must use the exact name to locate ourselves. */	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);	tb[1] = &palg.attr; 	tb[2] = NULL; 	geniv = alg->cra_aead.geniv; 	tmpl = crypto_lookup_template(geniv);	err = -ENOENT;	if (!tmpl)		goto kill_larval; 	inst = tmpl->alloc(tb);	err = PTR_ERR(inst);	if (IS_ERR(inst))		goto put_tmpl; 	if ((err = crypto_register_instance(tmpl, inst))) {		tmpl->free(inst);		goto put_tmpl;	} 	/* Redo the lookup to use the instance we just registered. */	err = -EAGAIN; put_tmpl:	crypto_tmpl_put(tmpl);kill_larval:	crypto_larval_kill(larval);drop_larval:	crypto_mod_put(larval);out:	crypto_mod_put(alg);	return err;} struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask){	struct crypto_alg *alg; 	alg = crypto_alg_mod_lookup(name, type, mask);	if (IS_ERR(alg))		return alg; 	if (alg->cra_type == &crypto_aead_type)		return alg; 	if (!alg->cra_aead.ivsize)		return alg; 	crypto_mod_put(alg);	alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,				    mask & ~CRYPTO_ALG_TESTED);	if (IS_ERR(alg))		return alg; 	if (alg->cra_type == &crypto_aead_type) {		if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {			crypto_mod_put(alg);			alg = ERR_PTR(-ENOENT);		}		return alg;	} 

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