/* 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_FORBID_WEAK_KEYS (1 << 0) static inline int __xts_verify_key(const u8 *key, size_t keylen, int flags){	/*	 * key consists of keys of equal size concatenated, therefore	 * the length must be even.	 */	if (keylen % 2)		return -EINVAL; 	/*	 * In FIPS mode only a combined key length of either 256 or	 * 512 bits is allowed, c.f. FIPS 140-3 IG C.I.	 */	if (fips_enabled && keylen != 32 && keylen != 64)		return -EINVAL; 	/*	 * Ensure that the AES and tweak key are not identical when	 * in FIPS mode or the FORBID_WEAK_KEYS flag is set.	 */	if ((fips_enabled || (flags & XTS_FORBID_WEAK_KEYS)) &&	    !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){	int flags = (crypto_skcipher_get_flags(tfm) &		     CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) ?			    XTS_FORBID_WEAK_KEYS :			    0; 	return __xts_verify_key(key, keylen, flags);} #endif  /* _CRYPTO_XTS_H */