[linux-block.git] / include / crypto / xts.h

/* 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 */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
ce004556 JK	2	#ifndef _CRYPTO_XTS_H
	3	#define _CRYPTO_XTS_H
	4
	5	#include <crypto/b128ops.h>
f1c131b4	6	#include <crypto/internal/skcipher.h>
28856a9e	7	#include <linux/fips.h>
ce004556	8
ce004556 JK	9	#define XTS_BLOCK_SIZE 16
ce004556 JK	10
28856a9e SM	11	static inline int xts_check_key(struct crypto_tfm *tfm,
	12	const u8 *key, unsigned int keylen)
	13	{
	14	u32 *flags = &tfm->crt_flags;
	15
	16	/*
	17	* key consists of keys of equal size concatenated, therefore
	18	* the length must be even.
	19	*/
	20	if (keylen % 2) {
	21	*flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	22	return -EINVAL;
	23	}
	24
	25	/* ensure that the AES and tweak key are not identical */
	26	if (fips_enabled &&
	27	!crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
	28	*flags \|= CRYPTO_TFM_RES_WEAK_KEY;
	29	return -EINVAL;
	30	}
	31
	32	return 0;
	33	}
	34
f1c131b4 HX	35	static inline int xts_verify_key(struct crypto_skcipher *tfm,
	36	const u8 *key, unsigned int keylen)
	37	{
	38	/*
	39	* key consists of keys of equal size concatenated, therefore
	40	* the length must be even.
	41	*/
	42	if (keylen % 2) {
	43	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	44	return -EINVAL;
	45	}
	46
	47	/* ensure that the AES and tweak key are not identical */
231baecd EB	48	if ((fips_enabled \|\| (crypto_skcipher_get_flags(tfm) &
231baecd EB	49	CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&
f1c131b4 HX	50	!crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
	51	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
	52	return -EINVAL;
	53	}
	54
	55	return 0;
	56	}
	57
ce004556	58	#endif /* _CRYPTO_XTS_H */