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 */
|