crypto/lskcipher.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Linear symmetric key cipher operations.
  *
  * Generic encrypt/decrypt wrapper for ciphers.
  *
  * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
  */

 #include <linux/cryptouser.h>
 #include <linux/err.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <net/netlink.h>
 #include "skcipher.h"

 static inline struct crypto_lskcipher *__crypto_lskcipher_cast(
 	struct crypto_tfm *tfm)
 {
 	return container_of(tfm, struct crypto_lskcipher, base);
 }

 static inline struct lskcipher_alg *__crypto_lskcipher_alg(
 	struct crypto_alg *alg)
 {
 	return container_of(alg, struct lskcipher_alg, co.base);
 }

 static int lskcipher_setkey_unaligned(struct crypto_lskcipher *tfm,
 				      const u8 *key, unsigned int keylen)
 {
 	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
 	struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);
 	u8 *buffer, *alignbuffer;
 	unsigned long absize;
 	int ret;

 	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 = cipher->setkey(tfm, alignbuffer, keylen);
 	kfree_sensitive(buffer);
 	return ret;
 }

 int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm, const u8 *key,
 			    unsigned int keylen)
 {
 	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
 	struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);

 	if (keylen < cipher->co.min_keysize || keylen > cipher->co.max_keysize)
 		return -EINVAL;

 	if ((unsigned long)key & alignmask)
 		return lskcipher_setkey_unaligned(tfm, key, keylen);
 	else
 		return cipher->setkey(tfm, key, keylen);
 }
 EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey);

 static int crypto_lskcipher_crypt_unaligned(
 	struct crypto_lskcipher *tfm, const u8 *src, u8 *dst, unsigned len,
 	u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src,
 			     u8 *dst, unsigned len, u8 *iv, u32 flags))
 {
 	unsigned statesize = crypto_lskcipher_statesize(tfm);
 	unsigned ivsize = crypto_lskcipher_ivsize(tfm);
 	unsigned bs = crypto_lskcipher_blocksize(tfm);
 	unsigned cs = crypto_lskcipher_chunksize(tfm);
 	int err;
 	u8 *tiv;
 	u8 *p;

 	BUILD_BUG_ON(MAX_CIPHER_BLOCKSIZE > PAGE_SIZE ||
 		     MAX_CIPHER_ALIGNMASK >= PAGE_SIZE);

 	tiv = kmalloc(PAGE_SIZE, GFP_ATOMIC);
 	if (!tiv)
 		return -ENOMEM;

 	memcpy(tiv, iv, ivsize + statesize);

 	p = kmalloc(PAGE_SIZE, GFP_ATOMIC);
 	err = -ENOMEM;
 	if (!p)
 		goto out;

 	while (len >= bs) {
 		unsigned chunk = min((unsigned)PAGE_SIZE, len);
 		int err;

 		if (chunk > cs)
 			chunk &= ~(cs - 1);

 		memcpy(p, src, chunk);
 		err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL);
 		if (err)
 			goto out;

 		memcpy(dst, p, chunk);
 		src += chunk;
 		dst += chunk;
 		len -= chunk;
 	}

 	err = len ? -EINVAL : 0;

 out:
 	memcpy(iv, tiv, ivsize + statesize);
 	kfree_sensitive(p);
 	kfree_sensitive(tiv);
 	return err;
 }

 static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src,
 				  u8 *dst, unsigned len, u8 *iv,
 				  int (*crypt)(struct crypto_lskcipher *tfm,
 					       const u8 *src, u8 *dst,
 					       unsigned len, u8 *iv,
 					       u32 flags))
 {
 	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);

 	if (((unsigned long)src | (unsigned long)dst | (unsigned long)iv) &
 	    alignmask)
 		return crypto_lskcipher_crypt_unaligned(tfm, src, dst, len, iv,
 							crypt);

 	return crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL);
 }

 int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src,
 			     u8 *dst, unsigned len, u8 *iv)
 {
 	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);

 	return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->encrypt);
 }
 EXPORT_SYMBOL_GPL(crypto_lskcipher_encrypt);

 int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
 			     u8 *dst, unsigned len, u8 *iv)
 {
 	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);

 	return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->decrypt);
 }
 EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt);

 static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
 				     int (*crypt)(struct crypto_lskcipher *tfm,
 						  const u8 *src, u8 *dst,
 						  unsigned len, u8 *ivs,
 						  u32 flags))
 {
 	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
 	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
 	u8 *ivs = skcipher_request_ctx(req);
 	struct crypto_lskcipher *tfm = *ctx;
 	struct skcipher_walk walk;
 	unsigned ivsize;
 	u32 flags;
 	int err;

 	ivsize = crypto_lskcipher_ivsize(tfm);
 	ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1);
 	memcpy(ivs, req->iv, ivsize);

 	flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;

 	if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT)
 		flags |= CRYPTO_LSKCIPHER_FLAG_CONT;

 	if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL))
 		flags |= CRYPTO_LSKCIPHER_FLAG_FINAL;

 	err = skcipher_walk_virt(&walk, req, false);

 	while (walk.nbytes) {
 		err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr,
 			    walk.nbytes, ivs,
 			    flags & ~(walk.nbytes == walk.total ?
 			    0 : CRYPTO_LSKCIPHER_FLAG_FINAL));
 		err = skcipher_walk_done(&walk, err);
 		flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
 	}

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

 	return err;
 }

 int crypto_lskcipher_encrypt_sg(struct skcipher_request *req)
 {
 	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
 	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
 	struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx);

 	return crypto_lskcipher_crypt_sg(req, alg->encrypt);
 }

 int crypto_lskcipher_decrypt_sg(struct skcipher_request *req)
 {
 	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
 	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
 	struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx);

 	return crypto_lskcipher_crypt_sg(req, alg->decrypt);
 }

 static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm)
 {
 	struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
 	struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);

 	alg->exit(skcipher);
 }

 static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm)
 {
 	struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
 	struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);

 	if (alg->exit)
 		skcipher->base.exit = crypto_lskcipher_exit_tfm;

 	if (alg->init)
 		return alg->init(skcipher);

 	return 0;
 }

 static void crypto_lskcipher_free_instance(struct crypto_instance *inst)
 {
 	struct lskcipher_instance *skcipher =
 		container_of(inst, struct lskcipher_instance, s.base);

 	skcipher->free(skcipher);
 }

 static void __maybe_unused crypto_lskcipher_show(
 	struct seq_file *m, struct crypto_alg *alg)
 {
 	struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);

 	seq_printf(m, "type         : lskcipher\n");
 	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 	seq_printf(m, "min keysize  : %u\n", skcipher->co.min_keysize);
 	seq_printf(m, "max keysize  : %u\n", skcipher->co.max_keysize);
 	seq_printf(m, "ivsize       : %u\n", skcipher->co.ivsize);
 	seq_printf(m, "chunksize    : %u\n", skcipher->co.chunksize);
 	seq_printf(m, "statesize    : %u\n", skcipher->co.statesize);
 }

 static int __maybe_unused crypto_lskcipher_report(
 	struct sk_buff *skb, struct crypto_alg *alg)
 {
 	struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);
 	struct crypto_report_blkcipher rblkcipher;

 	memset(&rblkcipher, 0, sizeof(rblkcipher));

 	strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type));
 	strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));

 	rblkcipher.blocksize = alg->cra_blocksize;
 	rblkcipher.min_keysize = skcipher->co.min_keysize;
 	rblkcipher.max_keysize = skcipher->co.max_keysize;
 	rblkcipher.ivsize = skcipher->co.ivsize;

 	return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
 		       sizeof(rblkcipher), &rblkcipher);
 }

 static const struct crypto_type crypto_lskcipher_type = {
 	.extsize = crypto_alg_extsize,
 	.init_tfm = crypto_lskcipher_init_tfm,
 	.free = crypto_lskcipher_free_instance,
 #ifdef CONFIG_PROC_FS
 	.show = crypto_lskcipher_show,
 #endif
 #if IS_ENABLED(CONFIG_CRYPTO_USER)
 	.report = crypto_lskcipher_report,
 #endif
 	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
 	.maskset = CRYPTO_ALG_TYPE_MASK,
 	.type = CRYPTO_ALG_TYPE_LSKCIPHER,
 	.tfmsize = offsetof(struct crypto_lskcipher, base),
 };

 static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm)
 {
 	struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);

 	crypto_free_lskcipher(*ctx);
 }

 int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm)
 {
 	struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);
 	struct crypto_alg *calg = tfm->__crt_alg;
 	struct crypto_lskcipher *skcipher;

 	if (!crypto_mod_get(calg))
 		return -EAGAIN;

 	skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type);
 	if (IS_ERR(skcipher)) {
 		crypto_mod_put(calg);
 		return PTR_ERR(skcipher);
 	}

 	*ctx = skcipher;
 	tfm->exit = crypto_lskcipher_exit_tfm_sg;

 	return 0;
 }

 int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn,
 			  struct crypto_instance *inst,
 			  const char *name, u32 type, u32 mask)
 {
 	spawn->base.frontend = &crypto_lskcipher_type;
 	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
 }
 EXPORT_SYMBOL_GPL(crypto_grab_lskcipher);

 struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name,
 						u32 type, u32 mask)
 {
 	return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask);
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher);

 static int lskcipher_prepare_alg(struct lskcipher_alg *alg)
 {
 	struct crypto_alg *base = &alg->co.base;
 	int err;

 	err = skcipher_prepare_alg_common(&alg->co);
 	if (err)
 		return err;

 	if (alg->co.chunksize & (alg->co.chunksize - 1))
 		return -EINVAL;

 	base->cra_type = &crypto_lskcipher_type;
 	base->cra_flags |= CRYPTO_ALG_TYPE_LSKCIPHER;

 	return 0;
 }

 int crypto_register_lskcipher(struct lskcipher_alg *alg)
 {
 	struct crypto_alg *base = &alg->co.base;
 	int err;

 	err = lskcipher_prepare_alg(alg);
 	if (err)
 		return err;

 	return crypto_register_alg(base);
 }
 EXPORT_SYMBOL_GPL(crypto_register_lskcipher);

 void crypto_unregister_lskcipher(struct lskcipher_alg *alg)
 {
 	crypto_unregister_alg(&alg->co.base);
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher);

 int crypto_register_lskciphers(struct lskcipher_alg *algs, int count)
 {
 	int i, ret;

 	for (i = 0; i < count; i++) {
 		ret = crypto_register_lskcipher(&algs[i]);
 		if (ret)
 			goto err;
 	}

 	return 0;

 err:
 	for (--i; i >= 0; --i)
 		crypto_unregister_lskcipher(&algs[i]);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(crypto_register_lskciphers);

 void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count)
 {
 	int i;

 	for (i = count - 1; i >= 0; --i)
 		crypto_unregister_lskcipher(&algs[i]);
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers);

 int lskcipher_register_instance(struct crypto_template *tmpl,
 				struct lskcipher_instance *inst)
 {
 	int err;

 	if (WARN_ON(!inst->free))
 		return -EINVAL;

 	err = lskcipher_prepare_alg(&inst->alg);
 	if (err)
 		return err;

 	return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst));
 }
 EXPORT_SYMBOL_GPL(lskcipher_register_instance);

 static int lskcipher_setkey_simple(struct crypto_lskcipher *tfm, const u8 *key,
 				   unsigned int keylen)
 {
 	struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm);

 	crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK);
 	crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) &
 				   CRYPTO_TFM_REQ_MASK);
 	return crypto_lskcipher_setkey(cipher, key, keylen);
 }

 static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm)
 {
 	struct lskcipher_instance *inst = lskcipher_alg_instance(tfm);
 	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
 	struct crypto_lskcipher_spawn *spawn;
 	struct crypto_lskcipher *cipher;

 	spawn = lskcipher_instance_ctx(inst);
 	cipher = crypto_spawn_lskcipher(spawn);
 	if (IS_ERR(cipher))
 		return PTR_ERR(cipher);

 	*ctx = cipher;
 	return 0;
 }

 static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm)
 {
 	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);

 	crypto_free_lskcipher(*ctx);
 }

 static void lskcipher_free_instance_simple(struct lskcipher_instance *inst)
 {
 	crypto_drop_lskcipher(lskcipher_instance_ctx(inst));
 	kfree(inst);
 }

 /**
  * lskcipher_alloc_instance_simple - allocate instance of simple block cipher
  *
  * Allocate an lskcipher_instance for a simple block cipher mode of operation,
  * e.g. cbc or ecb.  The instance context will have just a single crypto_spawn,
  * that for the underlying cipher.  The {min,max}_keysize, ivsize, blocksize,
  * alignmask, and priority are set from the underlying cipher but can be
  * overridden if needed.  The tfm context defaults to
  * struct crypto_lskcipher *, and default ->setkey(), ->init(), and
  * ->exit() methods are installed.
  *
  * @tmpl: the template being instantiated
  * @tb: the template parameters
  *
  * Return: a pointer to the new instance, or an ERR_PTR().  The caller still
  *	   needs to register the instance.
  */
 struct lskcipher_instance *lskcipher_alloc_instance_simple(
 	struct crypto_template *tmpl, struct rtattr **tb)
 {
 	u32 mask;
 	struct lskcipher_instance *inst;
 	struct crypto_lskcipher_spawn *spawn;
 	char ecb_name[CRYPTO_MAX_ALG_NAME];
 	struct lskcipher_alg *cipher_alg;
 	const char *cipher_name;
 	int err;

 	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask);
 	if (err)
 		return ERR_PTR(err);

 	cipher_name = crypto_attr_alg_name(tb[1]);
 	if (IS_ERR(cipher_name))
 		return ERR_CAST(cipher_name);

 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 	if (!inst)
 		return ERR_PTR(-ENOMEM);

 	spawn = lskcipher_instance_ctx(inst);
 	err = crypto_grab_lskcipher(spawn,
 				    lskcipher_crypto_instance(inst),
 				    cipher_name, 0, mask);

 	ecb_name[0] = 0;
 	if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) {
 		err = -ENAMETOOLONG;
 		if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
 			     cipher_name) >= CRYPTO_MAX_ALG_NAME)
 			goto err_free_inst;

 		err = crypto_grab_lskcipher(spawn,
 					    lskcipher_crypto_instance(inst),
 					    ecb_name, 0, mask);
 	}

 	if (err)
 		goto err_free_inst;

 	cipher_alg = crypto_lskcipher_spawn_alg(spawn);

 	err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name,
 				  &cipher_alg->co.base);
 	if (err)
 		goto err_free_inst;

 	if (ecb_name[0]) {
 		int len;

 		err = -EINVAL;
 		len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4],
 			      sizeof(ecb_name));
 		if (len < 2)
 			goto err_free_inst;

 		if (ecb_name[len - 1] != ')')
 			goto err_free_inst;

 		ecb_name[len - 1] = 0;

 		err = -ENAMETOOLONG;
 		if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME,
 			     "%s(%s)", tmpl->name, ecb_name) >=
 		    CRYPTO_MAX_ALG_NAME)
 			goto err_free_inst;

 		if (strcmp(ecb_name, cipher_name) &&
 		    snprintf(inst->alg.co.base.cra_driver_name,
 			     CRYPTO_MAX_ALG_NAME,
 			     "%s(%s)", tmpl->name, cipher_name) >=
 		    CRYPTO_MAX_ALG_NAME)
 			goto err_free_inst;
 	} else {
 		/* Don't allow nesting. */
 		err = -ELOOP;
 		if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE))
 			goto err_free_inst;
 	}

 	err = -EINVAL;
 	if (cipher_alg->co.ivsize)
 		goto err_free_inst;

 	inst->free = lskcipher_free_instance_simple;

 	/* Default algorithm properties, can be overridden */
 	inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize;
 	inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask;
 	inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority;
 	inst->alg.co.min_keysize = cipher_alg->co.min_keysize;
 	inst->alg.co.max_keysize = cipher_alg->co.max_keysize;
 	inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize;
 	inst->alg.co.statesize = cipher_alg->co.statesize;

 	/* Use struct crypto_lskcipher * by default, can be overridden */
 	inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *);
 	inst->alg.setkey = lskcipher_setkey_simple;
 	inst->alg.init = lskcipher_init_tfm_simple;
 	inst->alg.exit = lskcipher_exit_tfm_simple;

 	return inst;

 err_free_inst:
 	lskcipher_free_instance_simple(inst);
 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Linear symmetric key cipher operations.
	*
	* Generic encrypt/decrypt wrapper for ciphers.
	*
	* Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
	*/

	#include <linux/cryptouser.h>
	#include <linux/err.h>
	#include <linux/export.h>
	#include <linux/kernel.h>
	#include <linux/seq_file.h>
	#include <linux/slab.h>
	#include <linux/string.h>
	#include <net/netlink.h>
	#include "skcipher.h"

	static inline struct crypto_lskcipher *__crypto_lskcipher_cast(
	struct crypto_tfm *tfm)
	{
	return container_of(tfm, struct crypto_lskcipher, base);
	}

	static inline struct lskcipher_alg *__crypto_lskcipher_alg(
	struct crypto_alg *alg)
	{
	return container_of(alg, struct lskcipher_alg, co.base);
	}

	static int lskcipher_setkey_unaligned(struct crypto_lskcipher *tfm,
	const u8 *key, unsigned int keylen)
	{
	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
	struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);
	u8 buffer, alignbuffer;
	unsigned long absize;
	int ret;

	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 = cipher->setkey(tfm, alignbuffer, keylen);
	kfree_sensitive(buffer);
	return ret;
	}

	int crypto_lskcipher_setkey(struct crypto_lskcipher tfm, const u8 key,
	unsigned int keylen)
	{
	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
	struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);

	if (keylen < cipher->co.min_keysize \|\| keylen > cipher->co.max_keysize)
	return -EINVAL;

	if ((unsigned long)key & alignmask)
	return lskcipher_setkey_unaligned(tfm, key, keylen);
	else
	return cipher->setkey(tfm, key, keylen);
	}
	EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey);

	static int crypto_lskcipher_crypt_unaligned(
	struct crypto_lskcipher tfm, const u8 src, u8 *dst, unsigned len,
	u8 iv, int (crypt)(struct crypto_lskcipher tfm, const u8 src,
	u8 dst, unsigned len, u8 iv, u32 flags))
	{
	unsigned statesize = crypto_lskcipher_statesize(tfm);
	unsigned ivsize = crypto_lskcipher_ivsize(tfm);
	unsigned bs = crypto_lskcipher_blocksize(tfm);
	unsigned cs = crypto_lskcipher_chunksize(tfm);
	int err;
	u8 *tiv;
	u8 *p;

	BUILD_BUG_ON(MAX_CIPHER_BLOCKSIZE > PAGE_SIZE \|\|
	MAX_CIPHER_ALIGNMASK >= PAGE_SIZE);

	tiv = kmalloc(PAGE_SIZE, GFP_ATOMIC);
	if (!tiv)
	return -ENOMEM;

	memcpy(tiv, iv, ivsize + statesize);

	p = kmalloc(PAGE_SIZE, GFP_ATOMIC);
	err = -ENOMEM;
	if (!p)
	goto out;

	while (len >= bs) {
	unsigned chunk = min((unsigned)PAGE_SIZE, len);
	int err;

	if (chunk > cs)
	chunk &= ~(cs - 1);

	memcpy(p, src, chunk);
	err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL);
	if (err)
	goto out;

	memcpy(dst, p, chunk);
	src += chunk;
	dst += chunk;
	len -= chunk;
	}

	err = len ? -EINVAL : 0;

	out:
	memcpy(iv, tiv, ivsize + statesize);
	kfree_sensitive(p);
	kfree_sensitive(tiv);
	return err;
	}

	static int crypto_lskcipher_crypt(struct crypto_lskcipher tfm, const u8 src,
	u8 dst, unsigned len, u8 iv,
	int (crypt)(struct crypto_lskcipher tfm,
	const u8 src, u8 dst,
	unsigned len, u8 *iv,
	u32 flags))
	{
	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);

	if (((unsigned long)src \| (unsigned long)dst \| (unsigned long)iv) &
	alignmask)
	return crypto_lskcipher_crypt_unaligned(tfm, src, dst, len, iv,
	crypt);

	return crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL);
	}

	int crypto_lskcipher_encrypt(struct crypto_lskcipher tfm, const u8 src,
	u8 dst, unsigned len, u8 iv)
	{
	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);

	return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->encrypt);
	}
	EXPORT_SYMBOL_GPL(crypto_lskcipher_encrypt);

	int crypto_lskcipher_decrypt(struct crypto_lskcipher tfm, const u8 src,
	u8 dst, unsigned len, u8 iv)
	{
	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);

	return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->decrypt);
	}
	EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt);

	static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
	int (crypt)(struct crypto_lskcipher tfm,
	const u8 src, u8 dst,
	unsigned len, u8 *ivs,
	u32 flags))
	{
	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
	u8 *ivs = skcipher_request_ctx(req);
	struct crypto_lskcipher tfm = ctx;
	struct skcipher_walk walk;
	unsigned ivsize;
	u32 flags;
	int err;

	ivsize = crypto_lskcipher_ivsize(tfm);
	ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1);
	memcpy(ivs, req->iv, ivsize);

	flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;

	if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT)
	flags \|= CRYPTO_LSKCIPHER_FLAG_CONT;

	if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL))
	flags \|= CRYPTO_LSKCIPHER_FLAG_FINAL;

	err = skcipher_walk_virt(&walk, req, false);

	while (walk.nbytes) {
	err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr,
	walk.nbytes, ivs,
	flags & ~(walk.nbytes == walk.total ?
	0 : CRYPTO_LSKCIPHER_FLAG_FINAL));
	err = skcipher_walk_done(&walk, err);
	flags \|= CRYPTO_LSKCIPHER_FLAG_CONT;
	}

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

	return err;
	}

	int crypto_lskcipher_encrypt_sg(struct skcipher_request *req)
	{
	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
	struct lskcipher_alg alg = crypto_lskcipher_alg(ctx);

	return crypto_lskcipher_crypt_sg(req, alg->encrypt);
	}

	int crypto_lskcipher_decrypt_sg(struct skcipher_request *req)
	{
	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
	struct lskcipher_alg alg = crypto_lskcipher_alg(ctx);

	return crypto_lskcipher_crypt_sg(req, alg->decrypt);
	}

	static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm)
	{
	struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
	struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);

	alg->exit(skcipher);
	}

	static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm)
	{
	struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
	struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);

	if (alg->exit)
	skcipher->base.exit = crypto_lskcipher_exit_tfm;

	if (alg->init)
	return alg->init(skcipher);

	return 0;
	}

	static void crypto_lskcipher_free_instance(struct crypto_instance *inst)
	{
	struct lskcipher_instance *skcipher =
	container_of(inst, struct lskcipher_instance, s.base);

	skcipher->free(skcipher);
	}

	static void __maybe_unused crypto_lskcipher_show(
	struct seq_file m, struct crypto_alg alg)
	{
	struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);

	seq_printf(m, "type : lskcipher\n");
	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize : %u\n", skcipher->co.min_keysize);
	seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize);
	seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize);
	seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize);
	seq_printf(m, "statesize : %u\n", skcipher->co.statesize);
	}

	static int __maybe_unused crypto_lskcipher_report(
	struct sk_buff skb, struct crypto_alg alg)
	{
	struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);
	struct crypto_report_blkcipher rblkcipher;

	memset(&rblkcipher, 0, sizeof(rblkcipher));

	strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type));
	strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));

	rblkcipher.blocksize = alg->cra_blocksize;
	rblkcipher.min_keysize = skcipher->co.min_keysize;
	rblkcipher.max_keysize = skcipher->co.max_keysize;
	rblkcipher.ivsize = skcipher->co.ivsize;

	return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	sizeof(rblkcipher), &rblkcipher);
	}

	static const struct crypto_type crypto_lskcipher_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_lskcipher_init_tfm,
	.free = crypto_lskcipher_free_instance,
	#ifdef CONFIG_PROC_FS
	.show = crypto_lskcipher_show,
	#endif
	#if IS_ENABLED(CONFIG_CRYPTO_USER)
	.report = crypto_lskcipher_report,
	#endif
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_LSKCIPHER,
	.tfmsize = offsetof(struct crypto_lskcipher, base),
	};

	static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm)
	{
	struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);

	crypto_free_lskcipher(*ctx);
	}

	int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm)
	{
	struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);
	struct crypto_alg *calg = tfm->__crt_alg;
	struct crypto_lskcipher *skcipher;

	if (!crypto_mod_get(calg))
	return -EAGAIN;

	skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type);
	if (IS_ERR(skcipher)) {
	crypto_mod_put(calg);
	return PTR_ERR(skcipher);
	}

	*ctx = skcipher;
	tfm->exit = crypto_lskcipher_exit_tfm_sg;

	return 0;
	}

	int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn,
	struct crypto_instance *inst,
	const char *name, u32 type, u32 mask)
	{
	spawn->base.frontend = &crypto_lskcipher_type;
	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
	}
	EXPORT_SYMBOL_GPL(crypto_grab_lskcipher);

	struct crypto_lskcipher crypto_alloc_lskcipher(const char alg_name,
	u32 type, u32 mask)
	{
	return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask);
	}
	EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher);

	static int lskcipher_prepare_alg(struct lskcipher_alg *alg)
	{
	struct crypto_alg *base = &alg->co.base;
	int err;

	err = skcipher_prepare_alg_common(&alg->co);
	if (err)
	return err;

	if (alg->co.chunksize & (alg->co.chunksize - 1))
	return -EINVAL;

	base->cra_type = &crypto_lskcipher_type;
	base->cra_flags \|= CRYPTO_ALG_TYPE_LSKCIPHER;

	return 0;
	}

	int crypto_register_lskcipher(struct lskcipher_alg *alg)
	{
	struct crypto_alg *base = &alg->co.base;
	int err;

	err = lskcipher_prepare_alg(alg);
	if (err)
	return err;

	return crypto_register_alg(base);
	}
	EXPORT_SYMBOL_GPL(crypto_register_lskcipher);

	void crypto_unregister_lskcipher(struct lskcipher_alg *alg)
	{
	crypto_unregister_alg(&alg->co.base);
	}
	EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher);

	int crypto_register_lskciphers(struct lskcipher_alg *algs, int count)
	{
	int i, ret;

	for (i = 0; i < count; i++) {
	ret = crypto_register_lskcipher(&algs[i]);
	if (ret)
	goto err;
	}

	return 0;

	err:
	for (--i; i >= 0; --i)
	crypto_unregister_lskcipher(&algs[i]);

	return ret;
	}
	EXPORT_SYMBOL_GPL(crypto_register_lskciphers);

	void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count)
	{
	int i;

	for (i = count - 1; i >= 0; --i)
	crypto_unregister_lskcipher(&algs[i]);
	}
	EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers);

	int lskcipher_register_instance(struct crypto_template *tmpl,
	struct lskcipher_instance *inst)
	{
	int err;

	if (WARN_ON(!inst->free))
	return -EINVAL;

	err = lskcipher_prepare_alg(&inst->alg);
	if (err)
	return err;

	return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst));
	}
	EXPORT_SYMBOL_GPL(lskcipher_register_instance);

	static int lskcipher_setkey_simple(struct crypto_lskcipher tfm, const u8 key,
	unsigned int keylen)
	{
	struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm);

	crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK);
	crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) &
	CRYPTO_TFM_REQ_MASK);
	return crypto_lskcipher_setkey(cipher, key, keylen);
	}

	static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm)
	{
	struct lskcipher_instance *inst = lskcipher_alg_instance(tfm);
	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
	struct crypto_lskcipher_spawn *spawn;
	struct crypto_lskcipher *cipher;

	spawn = lskcipher_instance_ctx(inst);
	cipher = crypto_spawn_lskcipher(spawn);
	if (IS_ERR(cipher))
	return PTR_ERR(cipher);

	*ctx = cipher;
	return 0;
	}

	static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm)
	{
	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);

	crypto_free_lskcipher(*ctx);
	}

	static void lskcipher_free_instance_simple(struct lskcipher_instance *inst)
	{
	crypto_drop_lskcipher(lskcipher_instance_ctx(inst));
	kfree(inst);
	}

	/**
	* lskcipher_alloc_instance_simple - allocate instance of simple block cipher
	*
	* Allocate an lskcipher_instance for a simple block cipher mode of operation,
	* e.g. cbc or ecb. The instance context will have just a single crypto_spawn,
	* that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize,
	* alignmask, and priority are set from the underlying cipher but can be
	* overridden if needed. The tfm context defaults to
	* struct crypto_lskcipher *, and default ->setkey(), ->init(), and
	* ->exit() methods are installed.
	*
	* @tmpl: the template being instantiated
	* @tb: the template parameters
	*
	* Return: a pointer to the new instance, or an ERR_PTR(). The caller still
	* needs to register the instance.
	*/
	struct lskcipher_instance *lskcipher_alloc_instance_simple(
	struct crypto_template tmpl, struct rtattr *tb)
	{
	u32 mask;
	struct lskcipher_instance *inst;
	struct crypto_lskcipher_spawn *spawn;
	char ecb_name[CRYPTO_MAX_ALG_NAME];
	struct lskcipher_alg *cipher_alg;
	const char *cipher_name;
	int err;

	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask);
	if (err)
	return ERR_PTR(err);

	cipher_name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(cipher_name))
	return ERR_CAST(cipher_name);

	inst = kzalloc(sizeof(inst) + sizeof(spawn), GFP_KERNEL);
	if (!inst)
	return ERR_PTR(-ENOMEM);

	spawn = lskcipher_instance_ctx(inst);
	err = crypto_grab_lskcipher(spawn,
	lskcipher_crypto_instance(inst),
	cipher_name, 0, mask);

	ecb_name[0] = 0;
	if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) {
	err = -ENAMETOOLONG;
	if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
	cipher_name) >= CRYPTO_MAX_ALG_NAME)
	goto err_free_inst;

	err = crypto_grab_lskcipher(spawn,
	lskcipher_crypto_instance(inst),
	ecb_name, 0, mask);
	}

	if (err)
	goto err_free_inst;

	cipher_alg = crypto_lskcipher_spawn_alg(spawn);

	err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name,
	&cipher_alg->co.base);
	if (err)
	goto err_free_inst;

	if (ecb_name[0]) {
	int len;

	err = -EINVAL;
	len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4],
	sizeof(ecb_name));
	if (len < 2)
	goto err_free_inst;

	if (ecb_name[len - 1] != ')')
	goto err_free_inst;

	ecb_name[len - 1] = 0;

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME,
	"%s(%s)", tmpl->name, ecb_name) >=
	CRYPTO_MAX_ALG_NAME)
	goto err_free_inst;

	if (strcmp(ecb_name, cipher_name) &&
	snprintf(inst->alg.co.base.cra_driver_name,
	CRYPTO_MAX_ALG_NAME,
	"%s(%s)", tmpl->name, cipher_name) >=
	CRYPTO_MAX_ALG_NAME)
	goto err_free_inst;
	} else {
	/* Don't allow nesting. */
	err = -ELOOP;
	if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE))
	goto err_free_inst;
	}

	err = -EINVAL;
	if (cipher_alg->co.ivsize)
	goto err_free_inst;

	inst->free = lskcipher_free_instance_simple;

	/* Default algorithm properties, can be overridden */
	inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize;
	inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask;
	inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority;
	inst->alg.co.min_keysize = cipher_alg->co.min_keysize;
	inst->alg.co.max_keysize = cipher_alg->co.max_keysize;
	inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize;
	inst->alg.co.statesize = cipher_alg->co.statesize;

	/* Use struct crypto_lskcipher * by default, can be overridden */
	inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *);
	inst->alg.setkey = lskcipher_setkey_simple;
	inst->alg.init = lskcipher_init_tfm_simple;
	inst->alg.exit = lskcipher_exit_tfm_simple;

	return inst;

	err_free_inst:
	lskcipher_free_instance_simple(inst);
	return ERR_PTR(err);
	}
	EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple);