[linux-2.6-block.git] / crypto / blkcipher.c

/*
 * Block chaining cipher operations.
 * 
 * Generic encrypt/decrypt wrapper for ciphers, handles operations across
 * multiple page boundaries by using temporary blocks.  In user context,
 * the kernel is given a chance to schedule us once per page.
 *
 * 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/aead.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <linux/errno.h>
#include <linux/hardirq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>

#include "internal.h"

enum {
	BLKCIPHER_WALK_PHYS = 1 << 0,
	BLKCIPHER_WALK_SLOW = 1 << 1,
	BLKCIPHER_WALK_COPY = 1 << 2,
	BLKCIPHER_WALK_DIFF = 1 << 3,
};

static int blkcipher_walk_next(struct blkcipher_desc *desc,
			       struct blkcipher_walk *walk);
static int blkcipher_walk_first(struct blkcipher_desc *desc,
				struct blkcipher_walk *walk);

static inline void blkcipher_map_src(struct blkcipher_walk *walk)
{
	walk->src.virt.addr = scatterwalk_map(&walk->in);
}

static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
{
	walk->dst.virt.addr = scatterwalk_map(&walk->out);
}

static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
{
	scatterwalk_unmap(walk->src.virt.addr);
}

static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
{
	scatterwalk_unmap(walk->dst.virt.addr);
}

/* 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 *blkcipher_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 unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
					       unsigned int bsize)
{
	u8 *addr;

	addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
	addr = blkcipher_get_spot(addr, bsize);
	scatterwalk_copychunks(addr, &walk->out, bsize, 1);
	return bsize;
}

static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
					       unsigned int n)
{
	if (walk->flags & BLKCIPHER_WALK_COPY) {
		blkcipher_map_dst(walk);
		memcpy(walk->dst.virt.addr, walk->page, n);
		blkcipher_unmap_dst(walk);
	} else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
		if (walk->flags & BLKCIPHER_WALK_DIFF)
			blkcipher_unmap_dst(walk);
		blkcipher_unmap_src(walk);
	}

	scatterwalk_advance(&walk->in, n);
	scatterwalk_advance(&walk->out, n);

	return n;
}

int blkcipher_walk_done(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk, int err)
{
	unsigned int nbytes = 0;

	if (likely(err >= 0)) {
		unsigned int n = walk->nbytes - err;

		if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
			n = blkcipher_done_fast(walk, n);
		else if (WARN_ON(err)) {
			err = -EINVAL;
			goto err;
		} else
			n = blkcipher_done_slow(walk, n);

		nbytes = walk->total - n;
		err = 0;
	}

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

err:
	walk->total = nbytes;
	walk->nbytes = nbytes;

	if (nbytes) {
		crypto_yield(desc->flags);
		return blkcipher_walk_next(desc, walk);
	}

	if (walk->iv != desc->info)
		memcpy(desc->info, walk->iv, walk->ivsize);
	if (walk->buffer != walk->page)
		kfree(walk->buffer);
	if (walk->page)
		free_page((unsigned long)walk->page);

	return err;
}
EXPORT_SYMBOL_GPL(blkcipher_walk_done);

static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
				      struct blkcipher_walk *walk,
				      unsigned int bsize,
				      unsigned int alignmask)
{
	unsigned int n;
	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);

	if (walk->buffer)
		goto ok;

	walk->buffer = walk->page;
	if (walk->buffer)
		goto ok;

	n = aligned_bsize * 3 - (alignmask + 1) +
	    (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
	walk->buffer = kmalloc(n, GFP_ATOMIC);
	if (!walk->buffer)
		return blkcipher_walk_done(desc, walk, -ENOMEM);

ok:
	walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
					  alignmask + 1);
	walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
	walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
						 aligned_bsize, bsize);

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

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

	return 0;
}

static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
{
	u8 *tmp = walk->page;

	blkcipher_map_src(walk);
	memcpy(tmp, walk->src.virt.addr, walk->nbytes);
	blkcipher_unmap_src(walk);

	walk->src.virt.addr = tmp;
	walk->dst.virt.addr = tmp;

	return 0;
}

static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
				      struct blkcipher_walk *walk)
{
	unsigned long diff;

	walk->src.phys.page = scatterwalk_page(&walk->in);
	walk->src.phys.offset = offset_in_page(walk->in.offset);
	walk->dst.phys.page = scatterwalk_page(&walk->out);
	walk->dst.phys.offset = offset_in_page(walk->out.offset);

	if (walk->flags & BLKCIPHER_WALK_PHYS)
		return 0;

	diff = walk->src.phys.offset - walk->dst.phys.offset;
	diff |= walk->src.virt.page - walk->dst.virt.page;

	blkcipher_map_src(walk);
	walk->dst.virt.addr = walk->src.virt.addr;

	if (diff) {
		walk->flags |= BLKCIPHER_WALK_DIFF;
		blkcipher_map_dst(walk);
	}

	return 0;
}

static int blkcipher_walk_next(struct blkcipher_desc *desc,
			       struct blkcipher_walk *walk)
{
	unsigned int bsize;
	unsigned int n;
	int err;

	n = walk->total;
	if (unlikely(n < walk->cipher_blocksize)) {
		desc->flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
		return blkcipher_walk_done(desc, walk, -EINVAL);
	}

	walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY |
			 BLKCIPHER_WALK_DIFF);
	if (!scatterwalk_aligned(&walk->in, walk->alignmask) ||
	    !scatterwalk_aligned(&walk->out, walk->alignmask)) {
		walk->flags |= BLKCIPHER_WALK_COPY;
		if (!walk->page) {
			walk->page = (void *)__get_free_page(GFP_ATOMIC);
			if (!walk->page)
				n = 0;
		}
	}

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

	if (unlikely(n < bsize)) {
		err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
		goto set_phys_lowmem;
	}

	walk->nbytes = n;
	if (walk->flags & BLKCIPHER_WALK_COPY) {
		err = blkcipher_next_copy(walk);
		goto set_phys_lowmem;
	}

	return blkcipher_next_fast(desc, walk);

set_phys_lowmem:
	if (walk->flags & BLKCIPHER_WALK_PHYS) {
		walk->src.phys.page = virt_to_page(walk->src.virt.addr);
		walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
		walk->src.phys.offset &= PAGE_SIZE - 1;
		walk->dst.phys.offset &= PAGE_SIZE - 1;
	}
	return err;
}

static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
{
	unsigned bs = walk->walk_blocksize;
	unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1);
	unsigned int size = aligned_bs * 2 +
			    walk->ivsize + max(aligned_bs, walk->ivsize) -
			    (walk->alignmask + 1);
	u8 *iv;

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

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

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

int blkcipher_walk_virt(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk)
{
	walk->flags &= ~BLKCIPHER_WALK_PHYS;
	walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
	walk->cipher_blocksize = walk->walk_blocksize;
	walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
	walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
	return blkcipher_walk_first(desc, walk);
}
EXPORT_SYMBOL_GPL(blkcipher_walk_virt);

int blkcipher_walk_phys(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk)
{
	walk->flags |= BLKCIPHER_WALK_PHYS;
	walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
	walk->cipher_blocksize = walk->walk_blocksize;
	walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
	walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
	return blkcipher_walk_first(desc, walk);
}
EXPORT_SYMBOL_GPL(blkcipher_walk_phys);

static int blkcipher_walk_first(struct blkcipher_desc *desc,
				struct blkcipher_walk *walk)
{
	if (WARN_ON_ONCE(in_irq()))
		return -EDEADLK;

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

	walk->buffer = NULL;
	if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
		int err = blkcipher_copy_iv(walk);
		if (err)
			return err;
	}

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

	return blkcipher_walk_next(desc, walk);
}

int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
			      struct blkcipher_walk *walk,
			      unsigned int blocksize)
{
	walk->flags &= ~BLKCIPHER_WALK_PHYS;
	walk->walk_blocksize = blocksize;
	walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm);
	walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
	walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
	return blkcipher_walk_first(desc, walk);
}
EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);

int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
				   struct blkcipher_walk *walk,
				   struct crypto_aead *tfm,
				   unsigned int blocksize)
{
	walk->flags &= ~BLKCIPHER_WALK_PHYS;
	walk->walk_blocksize = blocksize;
	walk->cipher_blocksize = crypto_aead_blocksize(tfm);
	walk->ivsize = crypto_aead_ivsize(tfm);
	walk->alignmask = crypto_aead_alignmask(tfm);
	return blkcipher_walk_first(desc, walk);
}
EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block);

static int setkey_unaligned(struct crypto_tfm *tfm, const u8 *key,
			    unsigned int keylen)
{
	struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
	unsigned long alignmask = crypto_tfm_alg_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_tfm *tfm, const u8 *key, unsigned int keylen)
{
	struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
	unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);

	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
		tfm->crt_flags |= 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 int async_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
			unsigned int keylen)
{
	return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
}

static int async_encrypt(struct ablkcipher_request *req)
{
	struct crypto_tfm *tfm = req->base.tfm;
	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	struct blkcipher_desc desc = {
		.tfm = __crypto_blkcipher_cast(tfm),
		.info = req->info,
		.flags = req->base.flags,
	};


	return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
}

static int async_decrypt(struct ablkcipher_request *req)
{
	struct crypto_tfm *tfm = req->base.tfm;
	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	struct blkcipher_desc desc = {
		.tfm = __crypto_blkcipher_cast(tfm),
		.info = req->info,
		.flags = req->base.flags,
	};

	return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
}

static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
					     u32 mask)
{
	struct blkcipher_alg *cipher = &alg->cra_blkcipher;
	unsigned int len = alg->cra_ctxsize;

	if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
	    cipher->ivsize) {
		len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
		len += cipher->ivsize;
	}

	return len;
}

static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
{
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;

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

	return 0;
}

static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
{
	struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
	unsigned long addr;

	crt->setkey = setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;

	addr = (unsigned long)crypto_tfm_ctx(tfm);
	addr = ALIGN(addr, align);
	addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
	crt->iv = (void *)addr;

	return 0;
}

static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
{
	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;

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

	if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
		return crypto_init_blkcipher_ops_sync(tfm);
	else
		return crypto_init_blkcipher_ops_async(tfm);
}

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

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

	rblkcipher.blocksize = alg->cra_blocksize;
	rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
	rblkcipher.ivsize = alg->cra_blkcipher.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_blkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_blkcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	seq_printf(m, "type         : blkcipher\n");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize  : %u\n", alg->cra_blkcipher.min_keysize);
	seq_printf(m, "max keysize  : %u\n", alg->cra_blkcipher.max_keysize);
	seq_printf(m, "ivsize       : %u\n", alg->cra_blkcipher.ivsize);
	seq_printf(m, "geniv        : %s\n", alg->cra_blkcipher.geniv ?:
					     "<default>");
}

const struct crypto_type crypto_blkcipher_type = {
	.ctxsize = crypto_blkcipher_ctxsize,
	.init = crypto_init_blkcipher_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_blkcipher_show,
#endif
	.report = crypto_blkcipher_report,
};
EXPORT_SYMBOL_GPL(crypto_blkcipher_type);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic block chaining cipher type");
Commit	Line	Data
5cde0af2 HX	1	/*
	2	* Block chaining cipher operations.
	3	*
	4	* Generic encrypt/decrypt wrapper for ciphers, handles operations across
	5	* multiple page boundaries by using temporary blocks. In user context,
	6	* the kernel is given a chance to schedule us once per page.
	7	*
	8	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the Free
	12	* Software Foundation; either version 2 of the License, or (at your option)
	13	* any later version.
	14	*
	15	*/
	16
d1a2fd50	17	#include <crypto/aead.h>
ecfc4329	18	#include <crypto/internal/skcipher.h>
42c271c6	19	#include <crypto/scatterwalk.h>
5cde0af2	20	#include <linux/errno.h>
fb469840	21	#include <linux/hardirq.h>
5cde0af2	22	#include <linux/kernel.h>
5cde0af2	23	#include <linux/module.h>
5cde0af2 HX	24	#include <linux/seq_file.h>
	25	#include <linux/slab.h>
	26	#include <linux/string.h>
50496a1f SK	27	#include <linux/cryptouser.h>
50496a1f SK	28	#include <net/netlink.h>
5cde0af2 HX	29
5cde0af2 HX	30	#include "internal.h"
5cde0af2 HX	31
	32	enum {
	33	BLKCIPHER_WALK_PHYS = 1 << 0,
	34	BLKCIPHER_WALK_SLOW = 1 << 1,
	35	BLKCIPHER_WALK_COPY = 1 << 2,
	36	BLKCIPHER_WALK_DIFF = 1 << 3,
	37	};
	38
	39	static int blkcipher_walk_next(struct blkcipher_desc *desc,
	40	struct blkcipher_walk *walk);
	41	static int blkcipher_walk_first(struct blkcipher_desc *desc,
	42	struct blkcipher_walk *walk);
	43
	44	static inline void blkcipher_map_src(struct blkcipher_walk *walk)
	45	{
f0dfc0b0	46	walk->src.virt.addr = scatterwalk_map(&walk->in);
5cde0af2 HX	47	}
	48
	49	static inline void blkcipher_map_dst(struct blkcipher_walk *walk)
	50	{
f0dfc0b0	51	walk->dst.virt.addr = scatterwalk_map(&walk->out);
5cde0af2 HX	52	}
	53
	54	static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)
	55	{
f0dfc0b0	56	scatterwalk_unmap(walk->src.virt.addr);
5cde0af2 HX	57	}
	58
	59	static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)
	60	{
f0dfc0b0	61	scatterwalk_unmap(walk->dst.virt.addr);
5cde0af2 HX	62	}
5cde0af2 HX	63
e4630f9f HX	64	/* Get a spot of the specified length that does not straddle a page.
	65	* The caller needs to ensure that there is enough space for this operation.
	66	*/
5cde0af2 HX	67	static inline u8 blkcipher_get_spot(u8 start, unsigned int len)
5cde0af2 HX	68	{
e4630f9f	69	u8 end_page = (u8 )(((unsigned long)(start + len - 1)) & PAGE_MASK);
5aaff0c8	70	return max(start, end_page);
5cde0af2 HX	71	}
5cde0af2 HX	72
822be00f	73	static inline unsigned int blkcipher_done_slow(struct blkcipher_walk *walk,
5cde0af2 HX	74	unsigned int bsize)
	75	{
	76	u8 *addr;
5cde0af2	77
822be00f	78	addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
5cde0af2 HX	79	addr = blkcipher_get_spot(addr, bsize);
	80	scatterwalk_copychunks(addr, &walk->out, bsize, 1);
	81	return bsize;
	82	}
	83
	84	static inline unsigned int blkcipher_done_fast(struct blkcipher_walk *walk,
	85	unsigned int n)
	86	{
5cde0af2 HX	87	if (walk->flags & BLKCIPHER_WALK_COPY) {
	88	blkcipher_map_dst(walk);
	89	memcpy(walk->dst.virt.addr, walk->page, n);
	90	blkcipher_unmap_dst(walk);
	91	} else if (!(walk->flags & BLKCIPHER_WALK_PHYS)) {
5cde0af2 HX	92	if (walk->flags & BLKCIPHER_WALK_DIFF)
5cde0af2 HX	93	blkcipher_unmap_dst(walk);
61ecdb80	94	blkcipher_unmap_src(walk);
5cde0af2 HX	95	}
	96
	97	scatterwalk_advance(&walk->in, n);
	98	scatterwalk_advance(&walk->out, n);
	99
	100	return n;
	101	}
	102
	103	int blkcipher_walk_done(struct blkcipher_desc *desc,
	104	struct blkcipher_walk *walk, int err)
	105	{
5cde0af2 HX	106	unsigned int nbytes = 0;
	107
	108	if (likely(err >= 0)) {
7607bd8f	109	unsigned int n = walk->nbytes - err;
5cde0af2 HX	110
5cde0af2 HX	111	if (likely(!(walk->flags & BLKCIPHER_WALK_SLOW)))
7607bd8f HX	112	n = blkcipher_done_fast(walk, n);
	113	else if (WARN_ON(err)) {
	114	err = -EINVAL;
	115	goto err;
	116	} else
822be00f	117	n = blkcipher_done_slow(walk, n);
5cde0af2 HX	118
	119	nbytes = walk->total - n;
	120	err = 0;
	121	}
	122
	123	scatterwalk_done(&walk->in, 0, nbytes);
	124	scatterwalk_done(&walk->out, 1, nbytes);
	125
bac1b5c4	126	err:
5cde0af2 HX	127	walk->total = nbytes;
	128	walk->nbytes = nbytes;
	129
	130	if (nbytes) {
	131	crypto_yield(desc->flags);
	132	return blkcipher_walk_next(desc, walk);
	133	}
	134
	135	if (walk->iv != desc->info)
822be00f	136	memcpy(desc->info, walk->iv, walk->ivsize);
5cde0af2 HX	137	if (walk->buffer != walk->page)
	138	kfree(walk->buffer);
	139	if (walk->page)
	140	free_page((unsigned long)walk->page);
	141
	142	return err;
	143	}
	144	EXPORT_SYMBOL_GPL(blkcipher_walk_done);
	145
	146	static inline int blkcipher_next_slow(struct blkcipher_desc *desc,
	147	struct blkcipher_walk *walk,
	148	unsigned int bsize,
	149	unsigned int alignmask)
	150	{
	151	unsigned int n;
70613783	152	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
5cde0af2 HX	153
	154	if (walk->buffer)
	155	goto ok;
	156
	157	walk->buffer = walk->page;
	158	if (walk->buffer)
	159	goto ok;
	160
2614de1b	161	n = aligned_bsize * 3 - (alignmask + 1) +
e4630f9f	162	(alignmask & ~(crypto_tfm_ctx_alignment() - 1));
5cde0af2 HX	163	walk->buffer = kmalloc(n, GFP_ATOMIC);
	164	if (!walk->buffer)
	165	return blkcipher_walk_done(desc, walk, -ENOMEM);
	166
	167	ok:
	168	walk->dst.virt.addr = (u8 *)ALIGN((unsigned long)walk->buffer,
	169	alignmask + 1);
	170	walk->dst.virt.addr = blkcipher_get_spot(walk->dst.virt.addr, bsize);
70613783 HX	171	walk->src.virt.addr = blkcipher_get_spot(walk->dst.virt.addr +
70613783 HX	172	aligned_bsize, bsize);
5cde0af2 HX	173
	174	scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0);
	175
	176	walk->nbytes = bsize;
	177	walk->flags \|= BLKCIPHER_WALK_SLOW;
	178
	179	return 0;
	180	}
	181
	182	static inline int blkcipher_next_copy(struct blkcipher_walk *walk)
	183	{
	184	u8 *tmp = walk->page;
	185
	186	blkcipher_map_src(walk);
	187	memcpy(tmp, walk->src.virt.addr, walk->nbytes);
	188	blkcipher_unmap_src(walk);
	189
	190	walk->src.virt.addr = tmp;
	191	walk->dst.virt.addr = tmp;
	192
	193	return 0;
	194	}
	195
	196	static inline int blkcipher_next_fast(struct blkcipher_desc *desc,
	197	struct blkcipher_walk *walk)
	198	{
	199	unsigned long diff;
	200
	201	walk->src.phys.page = scatterwalk_page(&walk->in);
	202	walk->src.phys.offset = offset_in_page(walk->in.offset);
	203	walk->dst.phys.page = scatterwalk_page(&walk->out);
	204	walk->dst.phys.offset = offset_in_page(walk->out.offset);
	205
	206	if (walk->flags & BLKCIPHER_WALK_PHYS)
	207	return 0;
	208
	209	diff = walk->src.phys.offset - walk->dst.phys.offset;
	210	diff \|= walk->src.virt.page - walk->dst.virt.page;
	211
	212	blkcipher_map_src(walk);
	213	walk->dst.virt.addr = walk->src.virt.addr;
	214
	215	if (diff) {
	216	walk->flags \|= BLKCIPHER_WALK_DIFF;
	217	blkcipher_map_dst(walk);
	218	}
	219
	220	return 0;
	221	}
	222
	223	static int blkcipher_walk_next(struct blkcipher_desc *desc,
	224	struct blkcipher_walk *walk)
	225	{
7607bd8f	226	unsigned int bsize;
5cde0af2 HX	227	unsigned int n;
	228	int err;
	229
	230	n = walk->total;
822be00f	231	if (unlikely(n < walk->cipher_blocksize)) {
5cde0af2 HX	232	desc->flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
	233	return blkcipher_walk_done(desc, walk, -EINVAL);
	234	}
	235
	236	walk->flags &= ~(BLKCIPHER_WALK_SLOW \| BLKCIPHER_WALK_COPY \|
	237	BLKCIPHER_WALK_DIFF);
822be00f AB	238	if (!scatterwalk_aligned(&walk->in, walk->alignmask) \|\|
822be00f AB	239	!scatterwalk_aligned(&walk->out, walk->alignmask)) {
5cde0af2 HX	240	walk->flags \|= BLKCIPHER_WALK_COPY;
	241	if (!walk->page) {
	242	walk->page = (void *)__get_free_page(GFP_ATOMIC);
	243	if (!walk->page)
	244	n = 0;
	245	}
	246	}
	247
822be00f	248	bsize = min(walk->walk_blocksize, n);
5cde0af2 HX	249	n = scatterwalk_clamp(&walk->in, n);
	250	n = scatterwalk_clamp(&walk->out, n);
	251
	252	if (unlikely(n < bsize)) {
822be00f	253	err = blkcipher_next_slow(desc, walk, bsize, walk->alignmask);
5cde0af2 HX	254	goto set_phys_lowmem;
	255	}
	256
	257	walk->nbytes = n;
	258	if (walk->flags & BLKCIPHER_WALK_COPY) {
	259	err = blkcipher_next_copy(walk);
	260	goto set_phys_lowmem;
	261	}
	262
	263	return blkcipher_next_fast(desc, walk);
	264
	265	set_phys_lowmem:
	266	if (walk->flags & BLKCIPHER_WALK_PHYS) {
	267	walk->src.phys.page = virt_to_page(walk->src.virt.addr);
	268	walk->dst.phys.page = virt_to_page(walk->dst.virt.addr);
	269	walk->src.phys.offset &= PAGE_SIZE - 1;
	270	walk->dst.phys.offset &= PAGE_SIZE - 1;
	271	}
	272	return err;
	273	}
	274
822be00f	275	static inline int blkcipher_copy_iv(struct blkcipher_walk *walk)
5cde0af2	276	{
822be00f AB	277	unsigned bs = walk->walk_blocksize;
	278	unsigned aligned_bs = ALIGN(bs, walk->alignmask + 1);
	279	unsigned int size = aligned_bs * 2 +
	280	walk->ivsize + max(aligned_bs, walk->ivsize) -
	281	(walk->alignmask + 1);
5cde0af2 HX	282	u8 *iv;
5cde0af2 HX	283
822be00f	284	size += walk->alignmask & ~(crypto_tfm_ctx_alignment() - 1);
5cde0af2 HX	285	walk->buffer = kmalloc(size, GFP_ATOMIC);
	286	if (!walk->buffer)
	287	return -ENOMEM;
	288
822be00f	289	iv = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1);
70613783 HX	290	iv = blkcipher_get_spot(iv, bs) + aligned_bs;
70613783 HX	291	iv = blkcipher_get_spot(iv, bs) + aligned_bs;
822be00f	292	iv = blkcipher_get_spot(iv, walk->ivsize);
5cde0af2	293
822be00f	294	walk->iv = memcpy(iv, walk->iv, walk->ivsize);
5cde0af2 HX	295	return 0;
	296	}
	297
	298	int blkcipher_walk_virt(struct blkcipher_desc *desc,
	299	struct blkcipher_walk *walk)
	300	{
	301	walk->flags &= ~BLKCIPHER_WALK_PHYS;
822be00f AB	302	walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
	303	walk->cipher_blocksize = walk->walk_blocksize;
	304	walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
	305	walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
5cde0af2 HX	306	return blkcipher_walk_first(desc, walk);
	307	}
	308	EXPORT_SYMBOL_GPL(blkcipher_walk_virt);
	309
	310	int blkcipher_walk_phys(struct blkcipher_desc *desc,
	311	struct blkcipher_walk *walk)
	312	{
	313	walk->flags \|= BLKCIPHER_WALK_PHYS;
822be00f AB	314	walk->walk_blocksize = crypto_blkcipher_blocksize(desc->tfm);
	315	walk->cipher_blocksize = walk->walk_blocksize;
	316	walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
	317	walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
5cde0af2 HX	318	return blkcipher_walk_first(desc, walk);
	319	}
	320	EXPORT_SYMBOL_GPL(blkcipher_walk_phys);
	321
	322	static int blkcipher_walk_first(struct blkcipher_desc *desc,
	323	struct blkcipher_walk *walk)
	324	{
fb469840 HX	325	if (WARN_ON_ONCE(in_irq()))
	326	return -EDEADLK;
	327
70d906bc	328	walk->iv = desc->info;
5cde0af2 HX	329	walk->nbytes = walk->total;
	330	if (unlikely(!walk->total))
	331	return 0;
	332
	333	walk->buffer = NULL;
822be00f AB	334	if (unlikely(((unsigned long)walk->iv & walk->alignmask))) {
822be00f AB	335	int err = blkcipher_copy_iv(walk);
5cde0af2 HX	336	if (err)
	337	return err;
	338	}
	339
	340	scatterwalk_start(&walk->in, walk->in.sg);
	341	scatterwalk_start(&walk->out, walk->out.sg);
	342	walk->page = NULL;
	343
	344	return blkcipher_walk_next(desc, walk);
	345	}
	346
7607bd8f HX	347	int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
	348	struct blkcipher_walk *walk,
	349	unsigned int blocksize)
	350	{
	351	walk->flags &= ~BLKCIPHER_WALK_PHYS;
822be00f AB	352	walk->walk_blocksize = blocksize;
	353	walk->cipher_blocksize = crypto_blkcipher_blocksize(desc->tfm);
	354	walk->ivsize = crypto_blkcipher_ivsize(desc->tfm);
	355	walk->alignmask = crypto_blkcipher_alignmask(desc->tfm);
7607bd8f HX	356	return blkcipher_walk_first(desc, walk);
	357	}
	358	EXPORT_SYMBOL_GPL(blkcipher_walk_virt_block);
	359
4f7f1d7c AB	360	int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
	361	struct blkcipher_walk *walk,
	362	struct crypto_aead *tfm,
	363	unsigned int blocksize)
	364	{
	365	walk->flags &= ~BLKCIPHER_WALK_PHYS;
	366	walk->walk_blocksize = blocksize;
	367	walk->cipher_blocksize = crypto_aead_blocksize(tfm);
	368	walk->ivsize = crypto_aead_ivsize(tfm);
	369	walk->alignmask = crypto_aead_alignmask(tfm);
	370	return blkcipher_walk_first(desc, walk);
	371	}
	372	EXPORT_SYMBOL_GPL(blkcipher_aead_walk_virt_block);
	373
791b4d5f HX	374	static int setkey_unaligned(struct crypto_tfm tfm, const u8 key,
791b4d5f HX	375	unsigned int keylen)
ca7c3938 SS	376	{
	377	struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
	378	unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
	379	int ret;
	380	u8 buffer, alignbuffer;
	381	unsigned long absize;
	382
	383	absize = keylen + alignmask;
	384	buffer = kmalloc(absize, GFP_ATOMIC);
	385	if (!buffer)
	386	return -ENOMEM;
	387
	388	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	389	memcpy(alignbuffer, key, keylen);
	390	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	391	memset(alignbuffer, 0, keylen);
ca7c3938 SS	392	kfree(buffer);
	393	return ret;
	394	}
	395
791b4d5f	396	static int setkey(struct crypto_tfm tfm, const u8 key, unsigned int keylen)
5cde0af2 HX	397	{
5cde0af2 HX	398	struct blkcipher_alg *cipher = &tfm->__crt_alg->cra_blkcipher;
ca7c3938	399	unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
5cde0af2 HX	400
	401	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	402	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	403	return -EINVAL;
	404	}
	405
ca7c3938 SS	406	if ((unsigned long)key & alignmask)
	407	return setkey_unaligned(tfm, key, keylen);
	408
5cde0af2 HX	409	return cipher->setkey(tfm, key, keylen);
	410	}
	411
32e3983f HX	412	static int async_setkey(struct crypto_ablkcipher tfm, const u8 key,
	413	unsigned int keylen)
	414	{
	415	return setkey(crypto_ablkcipher_tfm(tfm), key, keylen);
	416	}
	417
	418	static int async_encrypt(struct ablkcipher_request *req)
	419	{
	420	struct crypto_tfm *tfm = req->base.tfm;
	421	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	422	struct blkcipher_desc desc = {
	423	.tfm = __crypto_blkcipher_cast(tfm),
	424	.info = req->info,
	425	.flags = req->base.flags,
	426	};
	427
	428
	429	return alg->encrypt(&desc, req->dst, req->src, req->nbytes);
	430	}
	431
	432	static int async_decrypt(struct ablkcipher_request *req)
	433	{
	434	struct crypto_tfm *tfm = req->base.tfm;
	435	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	436	struct blkcipher_desc desc = {
	437	.tfm = __crypto_blkcipher_cast(tfm),
	438	.info = req->info,
	439	.flags = req->base.flags,
	440	};
	441
	442	return alg->decrypt(&desc, req->dst, req->src, req->nbytes);
	443	}
	444
27d2a330 HX	445	static unsigned int crypto_blkcipher_ctxsize(struct crypto_alg *alg, u32 type,
27d2a330 HX	446	u32 mask)
5cde0af2 HX	447	{
	448	struct blkcipher_alg *cipher = &alg->cra_blkcipher;
	449	unsigned int len = alg->cra_ctxsize;
	450
332f8840 HX	451	if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK &&
332f8840 HX	452	cipher->ivsize) {
5cde0af2 HX	453	len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1);
	454	len += cipher->ivsize;
	455	}
	456
	457	return len;
	458	}
	459
32e3983f HX	460	static int crypto_init_blkcipher_ops_async(struct crypto_tfm *tfm)
	461	{
	462	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	463	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	464
	465	crt->setkey = async_setkey;
	466	crt->encrypt = async_encrypt;
	467	crt->decrypt = async_decrypt;
ecfc4329	468	crt->base = __crypto_ablkcipher_cast(tfm);
32e3983f HX	469	crt->ivsize = alg->ivsize;
	470
	471	return 0;
	472	}
	473
	474	static int crypto_init_blkcipher_ops_sync(struct crypto_tfm *tfm)
5cde0af2 HX	475	{
	476	struct blkcipher_tfm *crt = &tfm->crt_blkcipher;
	477	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	478	unsigned long align = crypto_tfm_alg_alignmask(tfm) + 1;
	479	unsigned long addr;
	480
5cde0af2 HX	481	crt->setkey = setkey;
	482	crt->encrypt = alg->encrypt;
	483	crt->decrypt = alg->decrypt;
	484
	485	addr = (unsigned long)crypto_tfm_ctx(tfm);
	486	addr = ALIGN(addr, align);
	487	addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
	488	crt->iv = (void *)addr;
	489
	490	return 0;
	491	}
	492
32e3983f HX	493	static int crypto_init_blkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	494	{
	495	struct blkcipher_alg *alg = &tfm->__crt_alg->cra_blkcipher;
	496
	497	if (alg->ivsize > PAGE_SIZE / 8)
	498	return -EINVAL;
	499
332f8840	500	if ((mask & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_MASK)
32e3983f HX	501	return crypto_init_blkcipher_ops_sync(tfm);
	502	else
	503	return crypto_init_blkcipher_ops_async(tfm);
	504	}
	505
3acc8473	506	#ifdef CONFIG_NET
50496a1f SK	507	static int crypto_blkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	508	{
	509	struct crypto_report_blkcipher rblkcipher;
	510
9a5467bf MK	511	strncpy(rblkcipher.type, "blkcipher", sizeof(rblkcipher.type));
	512	strncpy(rblkcipher.geniv, alg->cra_blkcipher.geniv ?: "<default>",
	513	sizeof(rblkcipher.geniv));
50496a1f SK	514
	515	rblkcipher.blocksize = alg->cra_blocksize;
	516	rblkcipher.min_keysize = alg->cra_blkcipher.min_keysize;
	517	rblkcipher.max_keysize = alg->cra_blkcipher.max_keysize;
	518	rblkcipher.ivsize = alg->cra_blkcipher.ivsize;
	519
6662df33 DM	520	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	521	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	522	goto nla_put_failure;
50496a1f SK	523	return 0;
	524
	525	nla_put_failure:
	526	return -EMSGSIZE;
	527	}
3acc8473 HX	528	#else
	529	static int crypto_blkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	530	{
	531	return -ENOSYS;
	532	}
	533	#endif
50496a1f	534
5cde0af2	535	static void crypto_blkcipher_show(struct seq_file m, struct crypto_alg alg)
03f5d8ce	536	__attribute__ ((unused));
5cde0af2 HX	537	static void crypto_blkcipher_show(struct seq_file m, struct crypto_alg alg)
	538	{
	539	seq_printf(m, "type : blkcipher\n");
	540	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	541	seq_printf(m, "min keysize : %u\n", alg->cra_blkcipher.min_keysize);
	542	seq_printf(m, "max keysize : %u\n", alg->cra_blkcipher.max_keysize);
	543	seq_printf(m, "ivsize : %u\n", alg->cra_blkcipher.ivsize);
23508e11 HX	544	seq_printf(m, "geniv : %s\n", alg->cra_blkcipher.geniv ?:
23508e11 HX	545	"<default>");
5cde0af2 HX	546	}
	547
	548	const struct crypto_type crypto_blkcipher_type = {
	549	.ctxsize = crypto_blkcipher_ctxsize,
	550	.init = crypto_init_blkcipher_ops,
	551	#ifdef CONFIG_PROC_FS
	552	.show = crypto_blkcipher_show,
	553	#endif
50496a1f	554	.report = crypto_blkcipher_report,
5cde0af2 HX	555	};
	556	EXPORT_SYMBOL_GPL(crypto_blkcipher_type);
	557
	558	MODULE_LICENSE("GPL");
	559	MODULE_DESCRIPTION("Generic block chaining cipher type");