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/*
* Cryptographic API.
*
* Cipher operations.
*
* Copyright (c) 2002 James Morris <jmorris@intercode.com.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 <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/crypto.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <asm/scatterlist.h>
#include "internal.h"
#include "scatterwalk.h"
typedef void (cryptfn_t)(void *, u8 *, const u8 *);
typedef void (procfn_t)(struct crypto_tfm *, u8 *,
u8*, cryptfn_t, void *);
static inline void xor_64(u8 *a, const u8 *b)
{
((u32 *)a)[0] ^= ((u32 *)b)[0];
((u32 *)a)[1] ^= ((u32 *)b)[1];
}
static inline void xor_128(u8 *a, const u8 *b)
{
((u32 *)a)[0] ^= ((u32 *)b)[0];
((u32 *)a)[1] ^= ((u32 *)b)[1];
((u32 *)a)[2] ^= ((u32 *)b)[2];
((u32 *)a)[3] ^= ((u32 *)b)[3];
}
static inline void *prepare_src(struct scatter_walk *walk, int bsize,
void *tmp, int in_place)
{
void *src = walk->data;
int n = bsize;
if (unlikely(scatterwalk_across_pages(walk, bsize))) {
src = tmp;
n = scatterwalk_copychunks(src, walk, bsize, 0);
}
scatterwalk_advance(walk, n);
return src;
}
static inline void *prepare_dst(struct scatter_walk *walk, int bsize,
void *tmp, int in_place)
{
void *dst = walk->data;
if (unlikely(scatterwalk_across_pages(walk, bsize)) || in_place)
dst = tmp;
return dst;
}
static inline void complete_src(struct scatter_walk *walk, int bsize,
void *src, int in_place)
{
}
static inline void complete_dst(struct scatter_walk *walk, int bsize,
void *dst, int in_place)
{
int n = bsize;
if (unlikely(scatterwalk_across_pages(walk, bsize)))
n = scatterwalk_copychunks(dst, walk, bsize, 1);
else if (in_place)
memcpy(walk->data, dst, bsize);
scatterwalk_advance(walk, n);
}
/*
* 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 block.
*/
static int crypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes, cryptfn_t crfn,
procfn_t prfn, void *info)
{
struct scatter_walk walk_in, walk_out;
const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
u8 tmp_src[bsize];
u8 tmp_dst[bsize];
if (!nbytes)
return 0;
if (nbytes % bsize) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
return -EINVAL;
}
scatterwalk_start(&walk_in, src);
scatterwalk_start(&walk_out, dst);
for(;;) {
u8 *src_p, *dst_p;
int in_place;
scatterwalk_map(&walk_in, 0);
scatterwalk_map(&walk_out, 1);
in_place = scatterwalk_samebuf(&walk_in, &walk_out);
do {
src_p = prepare_src(&walk_in, bsize, tmp_src,
in_place);
dst_p = prepare_dst(&walk_out, bsize, tmp_dst,
in_place);
prfn(tfm, dst_p, src_p, crfn, info);
complete_src(&walk_in, bsize, src_p, in_place);
complete_dst(&walk_out, bsize, dst_p, in_place);
nbytes -= bsize;
} while (nbytes &&
!scatterwalk_across_pages(&walk_in, bsize) &&
!scatterwalk_across_pages(&walk_out, bsize));
scatterwalk_done(&walk_in, 0, nbytes);
scatterwalk_done(&walk_out, 1, nbytes);
if (!nbytes)
return 0;
crypto_yield(tfm);
}
}
static void cbc_process_encrypt(struct crypto_tfm *tfm, u8 *dst, u8 *src,
cryptfn_t fn, void *info)
{
u8 *iv = info;
tfm->crt_u.cipher.cit_xor_block(iv, src);
fn(crypto_tfm_ctx(tfm), dst, iv);
memcpy(iv, dst, crypto_tfm_alg_blocksize(tfm));
}
static void cbc_process_decrypt(struct crypto_tfm *tfm, u8 *dst, u8 *src,
cryptfn_t fn, void *info)
{
u8 *iv = info;
fn(crypto_tfm_ctx(tfm), dst, src);
tfm->crt_u.cipher.cit_xor_block(dst, iv);
memcpy(iv, src, crypto_tfm_alg_blocksize(tfm));
}
static void ecb_process(struct crypto_tfm *tfm, u8 *dst, u8 *src,
cryptfn_t fn, void *info)
{
fn(crypto_tfm_ctx(tfm), dst, src);
}
static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
struct cipher_alg *cia = &tfm->__crt_alg->cra_cipher;
if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
} else
return cia->cia_setkey(crypto_tfm_ctx(tfm), key, keylen,
&tfm->crt_flags);
}
static int ecb_encrypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src, unsigned int nbytes)
{
return crypt(tfm, dst, src, nbytes,
tfm->__crt_alg->cra_cipher.cia_encrypt,
ecb_process, NULL);
}
static int ecb_decrypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes)
{
return crypt(tfm, dst, src, nbytes,
tfm->__crt_alg->cra_cipher.cia_decrypt,
ecb_process, NULL);
}
static int cbc_encrypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes)
{
return crypt(tfm, dst, src, nbytes,
tfm->__crt_alg->cra_cipher.cia_encrypt,
cbc_process_encrypt, tfm->crt_cipher.cit_iv);
}
static int cbc_encrypt_iv(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes, u8 *iv)
{
return crypt(tfm, dst, src, nbytes,
tfm->__crt_alg->cra_cipher.cia_encrypt,
cbc_process_encrypt, iv);
}
static int cbc_decrypt(struct crypto_tfm *tfm,
struct scatterlist *dst,
struct scatterlist *src,
unsigned int nbytes)
{
return crypt(tfm, dst, src, nbytes,
tfm->__crt_alg->cra_cipher.cia_decrypt,
cbc_process_decrypt, tfm->crt_cipher.cit_iv);
}
static int cbc_decrypt_iv(struct crypto_tfm *tfm,
struct scatterlist *dst
|