diff options
Diffstat (limited to 'include/crypto')
| -rw-r--r-- | include/crypto/xts.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/crypto/xts.h b/include/crypto/xts.h index 72c09eb56437..ede6b97b24cc 100644 --- a/include/crypto/xts.h +++ b/include/crypto/xts.h @@ -2,6 +2,9 @@ #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; @@ -24,4 +27,28 @@ 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 */ |