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Linux/include/crypto/xts.h

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  1 #ifndef _CRYPTO_XTS_H
  2 #define _CRYPTO_XTS_H
  3 
  4 #include <crypto/b128ops.h>
  5 #include <linux/crypto.h>
  6 #include <crypto/algapi.h>
  7 #include <linux/fips.h>
  8 
  9 struct scatterlist;
 10 struct blkcipher_desc;
 11 
 12 #define XTS_BLOCK_SIZE 16
 13 
 14 struct xts_crypt_req {
 15         be128 *tbuf;
 16         unsigned int tbuflen;
 17 
 18         void *tweak_ctx;
 19         void (*tweak_fn)(void *ctx, u8* dst, const u8* src);
 20         void *crypt_ctx;
 21         void (*crypt_fn)(void *ctx, u8 *blks, unsigned int nbytes);
 22 };
 23 
 24 #define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x))
 25 
 26 int xts_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 27               struct scatterlist *src, unsigned int nbytes,
 28               struct xts_crypt_req *req);
 29 
 30 static inline int xts_check_key(struct crypto_tfm *tfm,
 31                                 const u8 *key, unsigned int keylen)
 32 {
 33         u32 *flags = &tfm->crt_flags;
 34 
 35         /*
 36          * key consists of keys of equal size concatenated, therefore
 37          * the length must be even.
 38          */
 39         if (keylen % 2) {
 40                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 41                 return -EINVAL;
 42         }
 43 
 44         /* ensure that the AES and tweak key are not identical */
 45         if (fips_enabled &&
 46             !crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
 47                 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
 48                 return -EINVAL;
 49         }
 50 
 51         return 0;
 52 }
 53 
 54 #endif  /* _CRYPTO_XTS_H */
 55 

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