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PATH: usr / src / linux-headers-5.4.0-216 / include / crypto

/* 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)
{
	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 */

[-] sm4.h [edit]
[-] kpp.h [edit]
[-] sha1_base.h [edit]
[-] pkcs7.h [edit]
[-] md5.h [edit]
[-] poly1305.h [edit]
[-] gcm.h [edit]
[-] gf128mul.h [edit]
[-] authenc.h [edit]
[-] akcipher.h [edit]
[-] serpent.h [edit]
[-] if_alg.h [edit]
[-] cast_common.h [edit]
[-] sm3_base.h [edit]
[-] cast6.h [edit]
[-] blowfish.h [edit]
[-] skcipher.h [edit]
[-] b128ops.h [edit]
[-] cryptd.h [edit]
[-] sha.h [edit]
[-] hash_info.h [edit]
[-] streebog.h [edit]
[-] public_key.h [edit]
[-] cbc.h [edit]
[-] drbg.h [edit]
[-] nhpoly1305.h [edit]
[-] xts.h [edit]
[-] sha3.h [edit]
[-] acompress.h [edit]
[-] algapi.h [edit]
[+] ..
[-] hash.h [edit]
[-] arc4.h [edit]
[-] sm3.h [edit]
[-] chacha.h [edit]
[-] sha256_base.h [edit]
[-] ctr.h [edit]
[-] dh.h [edit]
[-] asym_tpm_subtype.h [edit]
[-] ghash.h [edit]
[-] cast5.h [edit]
[-] padlock.h [edit]
[-] aead.h [edit]
[-] des.h [edit]
[-] aes.h [edit]
[-] scatterwalk.h [edit]
[-] pcrypt.h [edit]
[-] null.h [edit]
[-] hmac.h [edit]
[-] ecdh.h [edit]
[-] rng.h [edit]
[-] blake2s.h [edit]
[-] sha512_base.h [edit]
[-] engine.h [edit]
[+] internal
[-] twofish.h [edit]