crypto: cbc - Export CBC implementation
This patch moves the core CBC implementation into a header file so that it can be reused by drivers implementing CBC. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>hifive-unleashed-5.1
Herbert Xu
parent
79c65d179a
commit
cc868d82ab
129
crypto/cbc.c
129
crypto/cbc.c
|
|
@ -1,7 +1,7 @@
|
|||
/*
|
||||
* CBC: Cipher Block Chaining mode
|
||||
*
|
||||
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
|
||||
* Copyright (c) 2006-2016 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
|
||||
|
|
@ -10,6 +10,7 @@
|
|||
*
|
||||
*/
|
||||
|
||||
#include <crypto/cbc.h>
|
||||
#include <crypto/internal/skcipher.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/init.h>
|
||||
|
|
@ -38,71 +39,6 @@ static int crypto_cbc_setkey(struct crypto_skcipher *parent, const u8 *key,
|
|||
return err;
|
||||
}
|
||||
|
||||
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 void crypto_cbc_encrypt_one(struct crypto_skcipher *tfm,
|
||||
const u8 *src, u8 *dst)
|
||||
{
|
||||
|
|
@ -116,67 +52,6 @@ static int crypto_cbc_encrypt(struct skcipher_request *req)
|
|||
return crypto_cbc_encrypt_walk(req, crypto_cbc_encrypt_one);
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
static inline void crypto_cbc_decrypt_one(struct crypto_skcipher *tfm,
|
||||
const u8 *src, u8 *dst)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -0,0 +1,146 @@
|
|||
/*
|
||||
* 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 */
|
||||
Loading…
Reference in New Issue