mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 05:02:12 +00:00
28856a9e52
The patch centralizes the XTS key check logic into the service function xts_check_key which is invoked from the different XTS implementations. With this, the XTS implementations in ARM, ARM64, PPC and S390 have now a sanity check for the XTS keys similar to the other arches. In addition, this service function received a check to ensure that the key != the tweak key which is mandated by FIPS 140-2 IG A.9. As the check is not present in the standards defining XTS, it is only enforced in FIPS mode of the kernel. Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
#ifndef _CRYPTO_XTS_H
|
|
#define _CRYPTO_XTS_H
|
|
|
|
#include <crypto/b128ops.h>
|
|
#include <linux/crypto.h>
|
|
#include <crypto/algapi.h>
|
|
#include <linux/fips.h>
|
|
|
|
struct scatterlist;
|
|
struct blkcipher_desc;
|
|
|
|
#define XTS_BLOCK_SIZE 16
|
|
|
|
struct xts_crypt_req {
|
|
be128 *tbuf;
|
|
unsigned int tbuflen;
|
|
|
|
void *tweak_ctx;
|
|
void (*tweak_fn)(void *ctx, u8* dst, const u8* src);
|
|
void *crypt_ctx;
|
|
void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
|
|
};
|
|
|
|
#define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x))
|
|
|
|
int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
|
|
struct scatterlist *src, unsigned int nbytes,
|
|
struct xts_crypt_req *req);
|
|
|
|
static inline int xts_check_key(struct crypto_tfm *tfm,
|
|
const u8 *key, unsigned int keylen)
|
|
{
|
|
u32 *flags = &tfm->crt_flags;
|
|
|
|
/*
|
|
* key consists of keys of equal size concatenated, therefore
|
|
* the length must be even.
|
|
*/
|
|
if (keylen % 2) {
|
|
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* ensure that the AES and tweak key are not identical */
|
|
if (fips_enabled &&
|
|
!crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
|
|
*flags |= CRYPTO_TFM_RES_WEAK_KEY;
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* _CRYPTO_XTS_H */
|