/* SPDX-License-Identifier: GPL-2.0 */#ifndef _CRYPTO_XTS_H#define _CRYPTO_XTS_H #include <crypto/b128ops.h>#include <crypto/internal/skcipher.h>#include <linux/fips.h> #define XTS_BLOCK_SIZE 16 #define XTS_TWEAK_CAST(x) ((void (*)(void *, u8*, const u8*))(x)) 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;} static inline int xts_verify_key(struct crypto_skcipher *tfm,				 const u8 *key, unsigned int keylen){	/*	 * key consists of keys of equal size concatenated, therefore	 * the length must be even.	 */	if (keylen % 2) {		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);		return -EINVAL;	} 	/* ensure that the AES and tweak key are not identical */	if ((fips_enabled || (crypto_skcipher_get_flags(tfm) &			      CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&	    !crypto_memneq(key, key + (keylen / 2), keylen / 2)) {		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);		return -EINVAL;	} 	return 0;} #endif  /* _CRYPTO_XTS_H */