/*
 * CBC: Cipher Block Chaining mode
 *
 * Copyright (c) 2016 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.
 *
 */

#ifndef _CRYPTO_CBC_H
#define _CRYPTO_CBC_H

#include <crypto/internal/skcipher.h>
#include <linux/string.h>
#include <linux/types.h>

static inline int crypto_cbc_encrypt_segment(
	struct skcipher_walk *walk, struct crypto_skcipher *tfm,
	void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
{
	unsigned int bsize = crypto_skcipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	u8 *iv = walk->iv;

	do {
		crypto_xor(iv, src, bsize);
		fn(tfm, iv, dst);
		memcpy(iv, dst, bsize);

		src += bsize;
		dst += bsize;
	} while ((nbytes -= bsize) >= bsize);

	return nbytes;
}

static inline int crypto_cbc_encrypt_inplace(
	struct skcipher_walk *walk, struct crypto_skcipher *tfm,
	void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
{
	unsigned int bsize = crypto_skcipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *iv = walk->iv;

	do {
		crypto_xor(src, iv, bsize);
		fn(tfm, src, src);
		iv = src;

		src += bsize;
	} while ((nbytes -= bsize) >= bsize);

	memcpy(walk->iv, iv, bsize);

	return nbytes;
}

static inline int crypto_cbc_encrypt_walk(struct skcipher_request *req,
					  void (*fn)(struct crypto_skcipher *,
						     const u8 *, u8 *))
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct skcipher_walk walk;
	int err;

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

	while (walk.nbytes) {
		if (walk.src.virt.addr == walk.dst.virt.addr)
			err = crypto_cbc_encrypt_inplace(&walk, tfm, fn);
		else
			err = crypto_cbc_encrypt_segment(&walk, tfm, fn);
		err = skcipher_walk_done(&walk, err);
	}

	return err;
}

static inline int crypto_cbc_decrypt_segment(
	struct skcipher_walk *walk, struct crypto_skcipher *tfm,
	void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
{
	unsigned int bsize = crypto_skcipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 *dst = walk->dst.virt.addr;
	u8 *iv = walk->iv;

	do {
		fn(tfm, src, dst);
		crypto_xor(dst, iv, bsize);
		iv = src;

		src += bsize;
		dst += bsize;
	} while ((nbytes -= bsize) >= bsize);

	memcpy(walk->iv, iv, bsize);

	return nbytes;
}

static inline int crypto_cbc_decrypt_inplace(
	struct skcipher_walk *walk, struct crypto_skcipher *tfm,
	void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
{
	unsigned int bsize = crypto_skcipher_blocksize(tfm);
	unsigned int nbytes = walk->nbytes;
	u8 *src = walk->src.virt.addr;
	u8 last_iv[bsize];

	/* Start of the last block. */
	src += nbytes - (nbytes & (bsize - 1)) - bsize;
	memcpy(last_iv, src, bsize);

	for (;;) {
		fn(tfm, src, src);
		if ((nbytes -= bsize) < bsize)
			break;
		crypto_xor(src, src - bsize, bsize);
		src -= bsize;
	}

	crypto_xor(src, walk->iv, bsize);
	memcpy(walk->iv, last_iv, bsize);

	return nbytes;
}

static inline int crypto_cbc_decrypt_blocks(
	struct skcipher_walk *walk, struct crypto_skcipher *tfm,
	void (*fn)(struct crypto_skcipher *, const u8 *, u8 *))
{
	if (walk->src.virt.addr == walk->dst.virt.addr)
		return crypto_cbc_decrypt_inplace(walk, tfm, fn);
	else
		return crypto_cbc_decrypt_segment(walk, tfm, fn);
}

#endif	/* _CRYPTO_CBC_H */
nux/net-next.git/diff/drivers/usb/image/Kconfig?id=57480b98af696795ab0daff0a6ed572172060a0f&amp;id2=a0615a16f7d0ceb5804d295203c302d496d8ee91'>Kconfig</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='57480b98af696795ab0daff0a6ed572172060a0f'/><input type='hidden' name='id2' value='a0615a16f7d0ceb5804d295203c302d496d8ee91'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=57480b98af696795ab0daff0a6ed572172060a0f&amp;id2=a0615a16f7d0ceb5804d295203c302d496d8ee91'>Diffstat</a> (limited to 'drivers/usb/image/Kconfig')</div><table summary='diffstat' class='diffstat'>