crypto/ablkcipher.c - third_party/linux - Git at Google

 /*
  * Asynchronous block chaining cipher operations.
  *
  * This is the asynchronous version of blkcipher.c indicating completion
  * via a callback.
  *
  * Copyright (c) 2006 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/skcipher.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/seq_file.h>
 #include <linux/cryptouser.h>
 #include <linux/compiler.h>
 #include <net/netlink.h>

 #include <crypto/scatterwalk.h>

 #include "internal.h"

 struct ablkcipher_buffer {
 	struct list_head	entry;
 	struct scatter_walk	dst;
 	unsigned int		len;
 	void			*data;
 };

 enum {
 	ABLKCIPHER_WALK_SLOW = 1 << 0,
 };

 static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
 {
 	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
 }

 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
 {
 	struct ablkcipher_buffer *p, *tmp;

 	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
 		ablkcipher_buffer_write(p);
 		list_del(&p->entry);
 		kfree(p);
 	}
 }
 EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);

 static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
 					  struct ablkcipher_buffer *p)
 {
 	p->dst = walk->out;
 	list_add_tail(&p->entry, &walk->buffers);
 }

 /* Get a spot of the specified length that does not straddle a page.
  * The caller needs to ensure that there is enough space for this operation.
  */
 static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
 {
 	u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);

 	return max(start, end_page);
 }

 static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk,
 					unsigned int n)
 {
 	for (;;) {
 		unsigned int len_this_page = scatterwalk_pagelen(&walk->out);

 		if (len_this_page > n)
 			len_this_page = n;
 		scatterwalk_advance(&walk->out, n);
 		if (n == len_this_page)
 			break;
 		n -= len_this_page;
 		scatterwalk_start(&walk->out, sg_next(walk->out.sg));
 	}
 }

 static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk,
 					unsigned int n)
 {
 	scatterwalk_advance(&walk->in, n);
 	scatterwalk_advance(&walk->out, n);
 }

 static int ablkcipher_walk_next(struct ablkcipher_request *req,
 				struct ablkcipher_walk *walk);

 int ablkcipher_walk_done(struct ablkcipher_request *req,
 			 struct ablkcipher_walk *walk, int err)
 {
 	struct crypto_tfm *tfm = req->base.tfm;
 	unsigned int n; /* bytes processed */
 	bool more;

 	if (unlikely(err < 0))
 		goto finish;

 	n = walk->nbytes - err;
 	walk->total -= n;
 	more = (walk->total != 0);

 	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) {
 		ablkcipher_done_fast(walk, n);
 	} else {
 		if (WARN_ON(err)) {
 			/* unexpected case; didn't process all bytes */
 			err = -EINVAL;
 			goto finish;
 		}
 		ablkcipher_done_slow(walk, n);
 	}

 	scatterwalk_done(&walk->in, 0, more);
 	scatterwalk_done(&walk->out, 1, more);

 	if (more) {
 		crypto_yield(req->base.flags);
 		return ablkcipher_walk_next(req, walk);
 	}
 	err = 0;
 finish:
 	walk->nbytes = 0;
 	if (walk->iv != req->info)
 		memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
 	kfree(walk->iv_buffer);
 	return err;
 }
 EXPORT_SYMBOL_GPL(ablkcipher_walk_done);

 static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
 				       struct ablkcipher_walk *walk,
 				       unsigned int bsize,
 				       unsigned int alignmask,
 				       void **src_p, void **dst_p)
 {
 	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
 	struct ablkcipher_buffer *p;
 	void *src, *dst, *base;
 	unsigned int n;

 	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
 	n += (aligned_bsize * 3 - (alignmask + 1) +
 	      (alignmask & ~(crypto_tfm_ctx_alignment() - 1)));

 	p = kmalloc(n, GFP_ATOMIC);
 	if (!p)
 		return ablkcipher_walk_done(req, walk, -ENOMEM);

 	base = p + 1;

 	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
 	src = dst = ablkcipher_get_spot(dst, bsize);

 	p->len = bsize;
 	p->data = dst;

 	scatterwalk_copychunks(src, &walk->in, bsize, 0);

 	ablkcipher_queue_write(walk, p);

 	walk->nbytes = bsize;
 	walk->flags |= ABLKCIPHER_WALK_SLOW;

 	*src_p = src;
 	*dst_p = dst;

 	return 0;
 }

 static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
 				     struct crypto_tfm *tfm,
 				     unsigned int alignmask)
 {
 	unsigned bs = walk->blocksize;
 	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
 	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
 	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
 			    (alignmask + 1);
 	u8 *iv;

 	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
 	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
 	if (!walk->iv_buffer)
 		return -ENOMEM;

 	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
 	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
 	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
 	iv = ablkcipher_get_spot(iv, ivsize);

 	walk->iv = memcpy(iv, walk->iv, ivsize);
 	return 0;
 }

 static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
 				       struct ablkcipher_walk *walk)
 {
 	walk->src.page = scatterwalk_page(&walk->in);
 	walk->src.offset = offset_in_page(walk->in.offset);
 	walk->dst.page = scatterwalk_page(&walk->out);
 	walk->dst.offset = offset_in_page(walk->out.offset);

 	return 0;
 }

 static int ablkcipher_walk_next(struct ablkcipher_request *req,
 				struct ablkcipher_walk *walk)
 {
 	struct crypto_tfm *tfm = req->base.tfm;
 	unsigned int alignmask, bsize, n;
 	void *src, *dst;
 	int err;

 	alignmask = crypto_tfm_alg_alignmask(tfm);
 	n = walk->total;
 	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
 		req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
 		return ablkcipher_walk_done(req, walk, -EINVAL);
 	}

 	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
 	src = dst = NULL;

 	bsize = min(walk->blocksize, n);
 	n = scatterwalk_clamp(&walk->in, n);
 	n = scatterwalk_clamp(&walk->out, n);

 	if (n < bsize ||
 	    !scatterwalk_aligned(&walk->in, alignmask) ||
 	    !scatterwalk_aligned(&walk->out, alignmask)) {
 		err = ablkcipher_next_slow(req, walk, bsize, alignmask,
 					   &src, &dst);
 		goto set_phys_lowmem;
 	}

 	walk->nbytes = n;

 	return ablkcipher_next_fast(req, walk);

 set_phys_lowmem:
 	if (err >= 0) {
 		walk->src.page = virt_to_page(src);
 		walk->dst.page = virt_to_page(dst);
 		walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
 		walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
 	}

 	return err;
 }

 static int ablkcipher_walk_first(struct ablkcipher_request *req,
 				 struct ablkcipher_walk *walk)
 {
 	struct crypto_tfm *tfm = req->base.tfm;
 	unsigned int alignmask;

 	alignmask = crypto_tfm_alg_alignmask(tfm);
 	if (WARN_ON_ONCE(in_irq()))
 		return -EDEADLK;

 	walk->iv = req->info;
 	walk->nbytes = walk->total;
 	if (unlikely(!walk->total))
 		return 0;

 	walk->iv_buffer = NULL;
 	if (unlikely(((unsigned long)walk->iv & alignmask))) {
 		int err = ablkcipher_copy_iv(walk, tfm, alignmask);

 		if (err)
 			return err;
 	}

 	scatterwalk_start(&walk->in, walk->in.sg);
 	scatterwalk_start(&walk->out, walk->out.sg);

 	return ablkcipher_walk_next(req, walk);
 }

 int ablkcipher_walk_phys(struct ablkcipher_request *req,
 			 struct ablkcipher_walk *walk)
 {
 	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
 	return ablkcipher_walk_first(req, walk);
 }
 EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);

 static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
 			    unsigned int keylen)
 {
 	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
 	unsigned long alignmask = crypto_ablkcipher_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 = cipher->setkey(tfm, alignbuffer, keylen);
 	memset(alignbuffer, 0, keylen);
 	kfree(buffer);
 	return ret;
 }

 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 		  unsigned int keylen)
 {
 	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
 	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);

 	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
 		crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}

 	if ((unsigned long)key & alignmask)
 		return setkey_unaligned(tfm, key, keylen);

 	return cipher->setkey(tfm, key, keylen);
 }

 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
 					      u32 mask)
 {
 	return alg->cra_ctxsize;
 }

 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
 				      u32 mask)
 {
 	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
 	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

 	if (alg->ivsize > PAGE_SIZE / 8)
 		return -EINVAL;

 	crt->setkey = setkey;
 	crt->encrypt = alg->encrypt;
 	crt->decrypt = alg->decrypt;
 	crt->base = __crypto_ablkcipher_cast(tfm);
 	crt->ivsize = alg->ivsize;

 	return 0;
 }

 #ifdef CONFIG_NET
 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	struct crypto_report_blkcipher rblkcipher;

 	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
 	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
 		sizeof(rblkcipher.geniv));

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

 	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
 		    sizeof(struct crypto_report_blkcipher), &rblkcipher))
 		goto nla_put_failure;
 	return 0;

 nla_put_failure:
 	return -EMSGSIZE;
 }
 #else
 static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	return -ENOSYS;
 }
 #endif

 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
 	__maybe_unused;
 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
 {
 	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

 	seq_printf(m, "type         : ablkcipher\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, "min keysize  : %u\n", ablkcipher->min_keysize);
 	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
 	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
 	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<default>");
 }

 const struct crypto_type crypto_ablkcipher_type = {
 	.ctxsize = crypto_ablkcipher_ctxsize,
 	.init = crypto_init_ablkcipher_ops,
 #ifdef CONFIG_PROC_FS
 	.show = crypto_ablkcipher_show,
 #endif
 	.report = crypto_ablkcipher_report,
 };
 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);

 static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
 				      u32 mask)
 {
 	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
 	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

 	if (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->base = __crypto_ablkcipher_cast(tfm);
 	crt->ivsize = alg->ivsize;

 	return 0;
 }

 #ifdef CONFIG_NET
 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	struct crypto_report_blkcipher rblkcipher;

 	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
 	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
 		sizeof(rblkcipher.geniv));

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

 	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
 		    sizeof(struct crypto_report_blkcipher), &rblkcipher))
 		goto nla_put_failure;
 	return 0;

 nla_put_failure:
 	return -EMSGSIZE;
 }
 #else
 static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 {
 	return -ENOSYS;
 }
 #endif

 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
 	__maybe_unused;
 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
 {
 	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

 	seq_printf(m, "type         : givcipher\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, "min keysize  : %u\n", ablkcipher->min_keysize);
 	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
 	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
 	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<built-in>");
 }

 const struct crypto_type crypto_givcipher_type = {
 	.ctxsize = crypto_ablkcipher_ctxsize,
 	.init = crypto_init_givcipher_ops,
 #ifdef CONFIG_PROC_FS
 	.show = crypto_givcipher_show,
 #endif
 	.report = crypto_givcipher_report,
 };
 EXPORT_SYMBOL_GPL(crypto_givcipher_type);
	/*
	* Asynchronous block chaining cipher operations.
	*
	* This is the asynchronous version of blkcipher.c indicating completion
	* via a callback.
	*
	* Copyright (c) 2006 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/skcipher.h>
	#include <linux/err.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/seq_file.h>
	#include <linux/cryptouser.h>
	#include <linux/compiler.h>
	#include <net/netlink.h>

	#include <crypto/scatterwalk.h>

	#include "internal.h"

	struct ablkcipher_buffer {
	struct list_head entry;
	struct scatter_walk dst;
	unsigned int len;
	void *data;
	};

	enum {
	ABLKCIPHER_WALK_SLOW = 1 << 0,
	};

	static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
	{
	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
	}

	void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
	{
	struct ablkcipher_buffer p, tmp;

	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
	ablkcipher_buffer_write(p);
	list_del(&p->entry);
	kfree(p);
	}
	}
	EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);

	static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
	struct ablkcipher_buffer *p)
	{
	p->dst = walk->out;
	list_add_tail(&p->entry, &walk->buffers);
	}

	/* Get a spot of the specified length that does not straddle a page.
	* The caller needs to ensure that there is enough space for this operation.
	*/
	static inline u8 ablkcipher_get_spot(u8 start, unsigned int len)
	{
	u8 end_page = (u8 )(((unsigned long)(start + len - 1)) & PAGE_MASK);

	return max(start, end_page);
	}

	static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk,
	unsigned int n)
	{
	for (;;) {
	unsigned int len_this_page = scatterwalk_pagelen(&walk->out);

	if (len_this_page > n)
	len_this_page = n;
	scatterwalk_advance(&walk->out, n);
	if (n == len_this_page)
	break;
	n -= len_this_page;
	scatterwalk_start(&walk->out, sg_next(walk->out.sg));
	}
	}

	static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk,
	unsigned int n)
	{
	scatterwalk_advance(&walk->in, n);
	scatterwalk_advance(&walk->out, n);
	}

	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	struct ablkcipher_walk *walk);

	int ablkcipher_walk_done(struct ablkcipher_request *req,
	struct ablkcipher_walk *walk, int err)
	{
	struct crypto_tfm *tfm = req->base.tfm;
	unsigned int n; /* bytes processed */
	bool more;

	if (unlikely(err < 0))
	goto finish;

	n = walk->nbytes - err;
	walk->total -= n;
	more = (walk->total != 0);

	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) {
	ablkcipher_done_fast(walk, n);
	} else {
	if (WARN_ON(err)) {
	/* unexpected case; didn't process all bytes */
	err = -EINVAL;
	goto finish;
	}
	ablkcipher_done_slow(walk, n);
	}

	scatterwalk_done(&walk->in, 0, more);
	scatterwalk_done(&walk->out, 1, more);

	if (more) {
	crypto_yield(req->base.flags);
	return ablkcipher_walk_next(req, walk);
	}
	err = 0;
	finish:
	walk->nbytes = 0;
	if (walk->iv != req->info)
	memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
	kfree(walk->iv_buffer);
	return err;
	}
	EXPORT_SYMBOL_GPL(ablkcipher_walk_done);

	static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
	struct ablkcipher_walk *walk,
	unsigned int bsize,
	unsigned int alignmask,
	void src_p, void dst_p)
	{
	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
	struct ablkcipher_buffer *p;
	void src, dst, *base;
	unsigned int n;

	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
	n += (aligned_bsize * 3 - (alignmask + 1) +
	(alignmask & ~(crypto_tfm_ctx_alignment() - 1)));

	p = kmalloc(n, GFP_ATOMIC);
	if (!p)
	return ablkcipher_walk_done(req, walk, -ENOMEM);

	base = p + 1;

	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
	src = dst = ablkcipher_get_spot(dst, bsize);

	p->len = bsize;
	p->data = dst;

	scatterwalk_copychunks(src, &walk->in, bsize, 0);

	ablkcipher_queue_write(walk, p);

	walk->nbytes = bsize;
	walk->flags \|= ABLKCIPHER_WALK_SLOW;

	*src_p = src;
	*dst_p = dst;

	return 0;
	}

	static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
	struct crypto_tfm *tfm,
	unsigned int alignmask)
	{
	unsigned bs = walk->blocksize;
	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
	(alignmask + 1);
	u8 *iv;

	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
	if (!walk->iv_buffer)
	return -ENOMEM;

	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	iv = ablkcipher_get_spot(iv, ivsize);

	walk->iv = memcpy(iv, walk->iv, ivsize);
	return 0;
	}

	static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
	struct ablkcipher_walk *walk)
	{
	walk->src.page = scatterwalk_page(&walk->in);
	walk->src.offset = offset_in_page(walk->in.offset);
	walk->dst.page = scatterwalk_page(&walk->out);
	walk->dst.offset = offset_in_page(walk->out.offset);

	return 0;
	}

	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	struct ablkcipher_walk *walk)
	{
	struct crypto_tfm *tfm = req->base.tfm;
	unsigned int alignmask, bsize, n;
	void src, dst;
	int err;

	alignmask = crypto_tfm_alg_alignmask(tfm);
	n = walk->total;
	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
	req->base.flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
	return ablkcipher_walk_done(req, walk, -EINVAL);
	}

	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
	src = dst = NULL;

	bsize = min(walk->blocksize, n);
	n = scatterwalk_clamp(&walk->in, n);
	n = scatterwalk_clamp(&walk->out, n);

	if (n < bsize \|\|
	!scatterwalk_aligned(&walk->in, alignmask) \|\|
	!scatterwalk_aligned(&walk->out, alignmask)) {
	err = ablkcipher_next_slow(req, walk, bsize, alignmask,
	&src, &dst);
	goto set_phys_lowmem;
	}

	walk->nbytes = n;

	return ablkcipher_next_fast(req, walk);

	set_phys_lowmem:
	if (err >= 0) {
	walk->src.page = virt_to_page(src);
	walk->dst.page = virt_to_page(dst);
	walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
	walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
	}

	return err;
	}

	static int ablkcipher_walk_first(struct ablkcipher_request *req,
	struct ablkcipher_walk *walk)
	{
	struct crypto_tfm *tfm = req->base.tfm;
	unsigned int alignmask;

	alignmask = crypto_tfm_alg_alignmask(tfm);
	if (WARN_ON_ONCE(in_irq()))
	return -EDEADLK;

	walk->iv = req->info;
	walk->nbytes = walk->total;
	if (unlikely(!walk->total))
	return 0;

	walk->iv_buffer = NULL;
	if (unlikely(((unsigned long)walk->iv & alignmask))) {
	int err = ablkcipher_copy_iv(walk, tfm, alignmask);

	if (err)
	return err;
	}

	scatterwalk_start(&walk->in, walk->in.sg);
	scatterwalk_start(&walk->out, walk->out.sg);

	return ablkcipher_walk_next(req, walk);
	}

	int ablkcipher_walk_phys(struct ablkcipher_request *req,
	struct ablkcipher_walk *walk)
	{
	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
	return ablkcipher_walk_first(req, walk);
	}
	EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);

	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
	unsigned int keylen)
	{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_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 = cipher->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
	}

	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	unsigned int keylen)
	{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);

	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	return -EINVAL;
	}

	if ((unsigned long)key & alignmask)
	return setkey_unaligned(tfm, key, keylen);

	return cipher->setkey(tfm, key, keylen);
	}

	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	u32 mask)
	{
	return alg->cra_ctxsize;
	}

	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	u32 mask)
	{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

	if (alg->ivsize > PAGE_SIZE / 8)
	return -EINVAL;

	crt->setkey = setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	crt->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
	}

	#ifdef CONFIG_NET
	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	{
	struct crypto_report_blkcipher rblkcipher;

	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
	sizeof(rblkcipher.geniv));

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

	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	goto nla_put_failure;
	return 0;

	nla_put_failure:
	return -EMSGSIZE;
	}
	#else
	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	{
	return -ENOSYS;
	}
	#endif

	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	__maybe_unused;
	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type : ablkcipher\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, "min keysize : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
	}

	const struct crypto_type crypto_ablkcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_ablkcipher_ops,
	#ifdef CONFIG_PROC_FS
	.show = crypto_ablkcipher_show,
	#endif
	.report = crypto_ablkcipher_report,
	};
	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);

	static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
	u32 mask)
	{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

	if (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->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
	}

	#ifdef CONFIG_NET
	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	{
	struct crypto_report_blkcipher rblkcipher;

	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
	sizeof(rblkcipher.geniv));

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

	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	goto nla_put_failure;
	return 0;

	nla_put_failure:
	return -EMSGSIZE;
	}
	#else
	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	{
	return -ENOSYS;
	}
	#endif

	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	__maybe_unused;
	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type : givcipher\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, "min keysize : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
	}

	const struct crypto_type crypto_givcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_givcipher_ops,
	#ifdef CONFIG_PROC_FS
	.show = crypto_givcipher_show,
	#endif
	.report = crypto_givcipher_report,
	};
	EXPORT_SYMBOL_GPL(crypto_givcipher_type);