mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
9979c6e55d
The refcounter of underlying algorithm should be incremented, otherwise it'll be destroyed with the cloned cipher, wrecking the original cipher. Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Cryptographic API.
|
|
*
|
|
* Single-block cipher operations.
|
|
*
|
|
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
|
|
* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*/
|
|
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/internal/cipher.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include "internal.h"
|
|
|
|
static int setkey_unaligned(struct crypto_cipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct cipher_alg *cia = crypto_cipher_alg(tfm);
|
|
unsigned long alignmask = crypto_cipher_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 = cia->cia_setkey(crypto_cipher_tfm(tfm), alignbuffer, keylen);
|
|
memset(alignbuffer, 0, keylen);
|
|
kfree(buffer);
|
|
return ret;
|
|
|
|
}
|
|
|
|
int crypto_cipher_setkey(struct crypto_cipher *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
struct cipher_alg *cia = crypto_cipher_alg(tfm);
|
|
unsigned long alignmask = crypto_cipher_alignmask(tfm);
|
|
|
|
if (keylen < cia->cia_min_keysize || keylen > cia->cia_max_keysize)
|
|
return -EINVAL;
|
|
|
|
if ((unsigned long)key & alignmask)
|
|
return setkey_unaligned(tfm, key, keylen);
|
|
|
|
return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, CRYPTO_INTERNAL);
|
|
|
|
static inline void cipher_crypt_one(struct crypto_cipher *tfm,
|
|
u8 *dst, const u8 *src, bool enc)
|
|
{
|
|
unsigned long alignmask = crypto_cipher_alignmask(tfm);
|
|
struct cipher_alg *cia = crypto_cipher_alg(tfm);
|
|
void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
|
|
enc ? cia->cia_encrypt : cia->cia_decrypt;
|
|
|
|
if (unlikely(((unsigned long)dst | (unsigned long)src) & alignmask)) {
|
|
unsigned int bs = crypto_cipher_blocksize(tfm);
|
|
u8 buffer[MAX_CIPHER_BLOCKSIZE + MAX_CIPHER_ALIGNMASK];
|
|
u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
|
|
|
|
memcpy(tmp, src, bs);
|
|
fn(crypto_cipher_tfm(tfm), tmp, tmp);
|
|
memcpy(dst, tmp, bs);
|
|
} else {
|
|
fn(crypto_cipher_tfm(tfm), dst, src);
|
|
}
|
|
}
|
|
|
|
void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
|
|
u8 *dst, const u8 *src)
|
|
{
|
|
cipher_crypt_one(tfm, dst, src, true);
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one, CRYPTO_INTERNAL);
|
|
|
|
void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
|
|
u8 *dst, const u8 *src)
|
|
{
|
|
cipher_crypt_one(tfm, dst, src, false);
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, CRYPTO_INTERNAL);
|
|
|
|
struct crypto_cipher *crypto_clone_cipher(struct crypto_cipher *cipher)
|
|
{
|
|
struct crypto_tfm *tfm = crypto_cipher_tfm(cipher);
|
|
struct crypto_alg *alg = tfm->__crt_alg;
|
|
struct crypto_cipher *ncipher;
|
|
struct crypto_tfm *ntfm;
|
|
|
|
if (alg->cra_init)
|
|
return ERR_PTR(-ENOSYS);
|
|
|
|
if (unlikely(!crypto_mod_get(alg)))
|
|
return ERR_PTR(-ESTALE);
|
|
|
|
ntfm = __crypto_alloc_tfmgfp(alg, CRYPTO_ALG_TYPE_CIPHER,
|
|
CRYPTO_ALG_TYPE_MASK, GFP_ATOMIC);
|
|
if (IS_ERR(ntfm)) {
|
|
crypto_mod_put(alg);
|
|
return ERR_CAST(ntfm);
|
|
}
|
|
|
|
ntfm->crt_flags = tfm->crt_flags;
|
|
|
|
ncipher = __crypto_cipher_cast(ntfm);
|
|
|
|
return ncipher;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_clone_cipher);
|