/* 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 static inline int xts_check_key(struct crypto_tfm *tfm,				const u8 *key, unsigned int keylen){	/*	 * key consists of keys of equal size concatenated, therefore	 * the length must be even.	 */	if (keylen % 2)		return -EINVAL; 	/* ensure that the AES and tweak key are not identical */	if (fips_enabled && !crypto_memneq(key, key + (keylen / 2), keylen / 2))		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)		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))		return -EINVAL; 	return 0;} #endif  /* _CRYPTO_XTS_H */