[thirdparty/openssl.git] / providers / implementations / ciphers / cipher_aes_xts.c

/*
 * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/*
 * AES low level APIs are deprecated for public use, but still ok for internal
 * use where we're using them to implement the higher level EVP interface, as is
 * the case here.
 */
#include "internal/deprecated.h"

#include "cipher_aes_xts.h"
#include "prov/implementations.h"
#include "prov/providercommonerr.h"

/* TODO (3.0) Figure out what flags need to be set */
#define AES_XTS_FLAGS (EVP_CIPH_CUSTOM_IV          \
                       | EVP_CIPH_ALWAYS_CALL_INIT \
                       | EVP_CIPH_CTRL_INIT        \
                       | EVP_CIPH_CUSTOM_COPY)

#define AES_XTS_IV_BITS 128
#define AES_XTS_BLOCK_BITS 8

/* forward declarations */
static OSSL_FUNC_cipher_encrypt_init_fn aes_xts_einit;
static OSSL_FUNC_cipher_decrypt_init_fn aes_xts_dinit;
static OSSL_FUNC_cipher_update_fn aes_xts_stream_update;
static OSSL_FUNC_cipher_final_fn aes_xts_stream_final;
static OSSL_FUNC_cipher_cipher_fn aes_xts_cipher;
static OSSL_FUNC_cipher_freectx_fn aes_xts_freectx;
static OSSL_FUNC_cipher_dupctx_fn aes_xts_dupctx;
static OSSL_FUNC_cipher_set_ctx_params_fn aes_xts_set_ctx_params;
static OSSL_FUNC_cipher_settable_ctx_params_fn aes_xts_settable_ctx_params;

/*
 * Verify that the two keys are different.
 *
 * This addresses the vulnerability described in Rogaway's
 * September 2004 paper:
 *
 *      "Efficient Instantiations of Tweakable Blockciphers and
 *       Refinements to Modes OCB and PMAC".
 *      (http://web.cs.ucdavis.edu/~rogaway/papers/offsets.pdf)
 *
 * FIPS 140-2 IG A.9 XTS-AES Key Generation Requirements states
 * that:
 *      "The check for Key_1 != Key_2 shall be done at any place
 *       BEFORE using the keys in the XTS-AES algorithm to process
 *       data with them."
 */
static int aes_xts_check_keys_differ(const unsigned char *key, size_t bytes,
                                     int enc)
{
    if ((!allow_insecure_decrypt || enc)
            && CRYPTO_memcmp(key, key + bytes, bytes) == 0) {
        ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DUPLICATED_KEYS);
        return 0;
    }
    return 1;
}

/*-
 * Provider dispatch functions
 */
static int aes_xts_init(void *vctx, const unsigned char *key, size_t keylen,
                        const unsigned char *iv, size_t ivlen, int enc)
{
    PROV_AES_XTS_CTX *xctx = (PROV_AES_XTS_CTX *)vctx;
    PROV_CIPHER_CTX *ctx = &xctx->base;

    ctx->enc = enc;

    if (iv != NULL) {
        if (!cipher_generic_initiv(vctx, iv, ivlen))
            return 0;
    }
    if (key != NULL) {
        if (keylen != ctx->keylen) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
            return 0;
        }
        if (!aes_xts_check_keys_differ(key, keylen / 2, enc))
            return 0;
        return ctx->hw->init(ctx, key, keylen);
    }
    return 1;
}

static int aes_xts_einit(void *vctx, const unsigned char *key, size_t keylen,
                         const unsigned char *iv, size_t ivlen)
{
    return aes_xts_init(vctx, key, keylen, iv, ivlen, 1);
}

static int aes_xts_dinit(void *vctx, const unsigned char *key, size_t keylen,
                         const unsigned char *iv, size_t ivlen)
{
    return aes_xts_init(vctx, key, keylen, iv, ivlen, 0);
}

static void *aes_xts_newctx(void *provctx, unsigned int mode, uint64_t flags,
                            size_t kbits, size_t blkbits, size_t ivbits)
{
    PROV_AES_XTS_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));

    if (ctx != NULL) {
        cipher_generic_initkey(&ctx->base, kbits, blkbits, ivbits, mode, flags,
                               PROV_CIPHER_HW_aes_xts(kbits), NULL);
    }
    return ctx;
}

static void aes_xts_freectx(void *vctx)
{
    PROV_AES_XTS_CTX *ctx = (PROV_AES_XTS_CTX *)vctx;

    OPENSSL_clear_free(ctx,  sizeof(*ctx));
}

static void *aes_xts_dupctx(void *vctx)
{
    PROV_AES_XTS_CTX *in = (PROV_AES_XTS_CTX *)vctx;
    PROV_AES_XTS_CTX *ret = NULL;

    if (in->xts.key1 != NULL) {
        if (in->xts.key1 != &in->ks1)
            return NULL;
    }
    if (in->xts.key2 != NULL) {
        if (in->xts.key2 != &in->ks2)
            return NULL;
    }
    ret = OPENSSL_malloc(sizeof(*ret));
    if (ret == NULL) {
        ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    in->base.hw->copyctx(&ret->base, &in->base);
    return ret;
}

static int aes_xts_cipher(void *vctx, unsigned char *out, size_t *outl,
                          size_t outsize, const unsigned char *in, size_t inl)
{
    PROV_AES_XTS_CTX *ctx = (PROV_AES_XTS_CTX *)vctx;

    if (ctx->xts.key1 == NULL
            || ctx->xts.key2 == NULL
            || !ctx->base.iv_set
            || out == NULL
            || in == NULL
            || inl < AES_BLOCK_SIZE)
        return 0;

    /*
     * Impose a limit of 2^20 blocks per data unit as specified by
     * IEEE Std 1619-2018.  The earlier and obsolete IEEE Std 1619-2007
     * indicated that this was a SHOULD NOT rather than a MUST NOT.
     * NIST SP 800-38E mandates the same limit.
     */
    if (inl > XTS_MAX_BLOCKS_PER_DATA_UNIT * AES_BLOCK_SIZE) {
        ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DATA_UNIT_IS_TOO_LARGE);
        return 0;
    }

    if (ctx->stream != NULL)
        (*ctx->stream)(in, out, inl, ctx->xts.key1, ctx->xts.key2, ctx->base.iv);
    else if (CRYPTO_xts128_encrypt(&ctx->xts, ctx->base.iv, in, out, inl,
                                   ctx->base.enc))
        return 0;

    *outl = inl;
    return 1;
}

static int aes_xts_stream_update(void *vctx, unsigned char *out, size_t *outl,
                                 size_t outsize, const unsigned char *in,
                                 size_t inl)
{
    PROV_AES_XTS_CTX *ctx = (PROV_AES_XTS_CTX *)vctx;

    if (outsize < inl) {
        ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
        return 0;
    }

    if (!aes_xts_cipher(ctx, out, outl, outsize, in, inl)) {
        ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
        return 0;
    }

    return 1;
}

static int aes_xts_stream_final(void *vctx, unsigned char *out, size_t *outl,
                                size_t outsize)
{
    *outl = 0;
    return 1;
}

static const OSSL_PARAM aes_xts_known_settable_ctx_params[] = {
    OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
    OSSL_PARAM_END
};

static const OSSL_PARAM *aes_xts_settable_ctx_params(void)
{
    return aes_xts_known_settable_ctx_params;
}

static int aes_xts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
    const OSSL_PARAM *p;

    /*
     * TODO(3.0) We need a general solution for handling missing parameters
     * inside set_params and get_params methods.
     */
    p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
    if (p != NULL) {
        size_t keylen;

        if (!OSSL_PARAM_get_size_t(p, &keylen)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
            return 0;
        }
        /* The key length can not be modified for xts mode */
        if (keylen != ctx->keylen)
            return 0;
    }

    return 1;
}

#define IMPLEMENT_cipher(lcmode, UCMODE, kbits, flags)                         \
static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##lcmode##_get_params;     \
static int aes_##kbits##_##lcmode##_get_params(OSSL_PARAM params[])            \
{                                                                              \
    return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,         \
                                     flags, 2 * kbits, AES_XTS_BLOCK_BITS,     \
                                     AES_XTS_IV_BITS);                         \
}                                                                              \
static OSSL_FUNC_cipher_newctx_fn aes_##kbits##_xts_newctx;                    \
static void *aes_##kbits##_xts_newctx(void *provctx)                           \
{                                                                              \
    return aes_xts_newctx(provctx, EVP_CIPH_##UCMODE##_MODE, flags, 2 * kbits, \
                          AES_XTS_BLOCK_BITS, AES_XTS_IV_BITS);                \
}                                                                              \
const OSSL_DISPATCH aes##kbits##xts_functions[] = {                            \
    { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))aes_##kbits##_xts_newctx },     \
    { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_xts_einit },          \
    { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_xts_dinit },          \
    { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_xts_stream_update },        \
    { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_xts_stream_final },          \
    { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_xts_cipher },               \
    { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_xts_freectx },             \
    { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_xts_dupctx },               \
    { OSSL_FUNC_CIPHER_GET_PARAMS,                                             \
      (void (*)(void))aes_##kbits##_##lcmode##_get_params },                   \
    { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,                                        \
      (void (*)(void))cipher_generic_gettable_params },                        \
    { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,                                         \
      (void (*)(void))cipher_generic_get_ctx_params },                         \
    { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                    \
      (void (*)(void))cipher_generic_gettable_ctx_params },                    \
    { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,                                         \
      (void (*)(void))aes_xts_set_ctx_params },                                \
    { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,                                    \
     (void (*)(void))aes_xts_settable_ctx_params },                            \
    { 0, NULL }                                                                \
}

IMPLEMENT_cipher(xts, XTS, 256, AES_XTS_FLAGS);
IMPLEMENT_cipher(xts, XTS, 128, AES_XTS_FLAGS);
Commit	Line	Data
3a9f26f3	1	/*
33388b44	2	* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
3a9f26f3 SL	3	*
	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
	8	*/
	9
c72fa255 MC	10	/*
	11	* AES low level APIs are deprecated for public use, but still ok for internal
	12	* use where we're using them to implement the higher level EVP interface, as is
	13	* the case here.
	14	*/
	15	#include "internal/deprecated.h"
	16
3a9f26f3	17	#include "cipher_aes_xts.h"
af3e7e1b	18	#include "prov/implementations.h"
ddd21319	19	#include "prov/providercommonerr.h"
3a9f26f3 SL	20
3a9f26f3 SL	21	/* TODO (3.0) Figure out what flags need to be set */
6ef81d38 RL	22	#define AES_XTS_FLAGS (EVP_CIPH_CUSTOM_IV \
	23	\| EVP_CIPH_ALWAYS_CALL_INIT \
	24	\| EVP_CIPH_CTRL_INIT \
3a9f26f3 SL	25	\| EVP_CIPH_CUSTOM_COPY)
	26
	27	#define AES_XTS_IV_BITS 128
	28	#define AES_XTS_BLOCK_BITS 8
	29
3a9f26f3	30	/* forward declarations */
363b1e5d DMSP	31	static OSSL_FUNC_cipher_encrypt_init_fn aes_xts_einit;
	32	static OSSL_FUNC_cipher_decrypt_init_fn aes_xts_dinit;
	33	static OSSL_FUNC_cipher_update_fn aes_xts_stream_update;
	34	static OSSL_FUNC_cipher_final_fn aes_xts_stream_final;
	35	static OSSL_FUNC_cipher_cipher_fn aes_xts_cipher;
	36	static OSSL_FUNC_cipher_freectx_fn aes_xts_freectx;
	37	static OSSL_FUNC_cipher_dupctx_fn aes_xts_dupctx;
	38	static OSSL_FUNC_cipher_set_ctx_params_fn aes_xts_set_ctx_params;
	39	static OSSL_FUNC_cipher_settable_ctx_params_fn aes_xts_settable_ctx_params;
3a9f26f3 SL	40
	41	/*
	42	* Verify that the two keys are different.
	43	*
	44	* This addresses the vulnerability described in Rogaway's
	45	* September 2004 paper:
	46	*
	47	* "Efficient Instantiations of Tweakable Blockciphers and
	48	* Refinements to Modes OCB and PMAC".
	49	* (http://web.cs.ucdavis.edu/~rogaway/papers/offsets.pdf)
	50	*
	51	* FIPS 140-2 IG A.9 XTS-AES Key Generation Requirements states
	52	* that:
	53	* "The check for Key_1 != Key_2 shall be done at any place
	54	* BEFORE using the keys in the XTS-AES algorithm to process
	55	* data with them."
	56	*/
	57	static int aes_xts_check_keys_differ(const unsigned char *key, size_t bytes,
	58	int enc)
	59	{
	60	if ((!allow_insecure_decrypt \|\| enc)
	61	&& CRYPTO_memcmp(key, key + bytes, bytes) == 0) {
	62	ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DUPLICATED_KEYS);
	63	return 0;
	64	}
	65	return 1;
	66	}
	67
	68	/*-
	69	* Provider dispatch functions
	70	*/
	71	static int aes_xts_init(void vctx, const unsigned char key, size_t keylen,
	72	const unsigned char *iv, size_t ivlen, int enc)
	73	{
	74	PROV_AES_XTS_CTX xctx = (PROV_AES_XTS_CTX )vctx;
	75	PROV_CIPHER_CTX *ctx = &xctx->base;
	76
	77	ctx->enc = enc;
	78
	79	if (iv != NULL) {
089cb623	80	if (!cipher_generic_initiv(vctx, iv, ivlen))
3a9f26f3	81	return 0;
3a9f26f3 SL	82	}
	83	if (key != NULL) {
	84	if (keylen != ctx->keylen) {
	85	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
	86	return 0;
	87	}
	88	if (!aes_xts_check_keys_differ(key, keylen / 2, enc))
	89	return 0;
	90	return ctx->hw->init(ctx, key, keylen);
	91	}
	92	return 1;
	93	}
	94
	95	static int aes_xts_einit(void vctx, const unsigned char key, size_t keylen,
	96	const unsigned char *iv, size_t ivlen)
	97	{
	98	return aes_xts_init(vctx, key, keylen, iv, ivlen, 1);
	99	}
	100
	101	static int aes_xts_dinit(void vctx, const unsigned char key, size_t keylen,
	102	const unsigned char *iv, size_t ivlen)
	103	{
	104	return aes_xts_init(vctx, key, keylen, iv, ivlen, 0);
	105	}
	106
55c7dc79 SL	107	static void aes_xts_newctx(void provctx, unsigned int mode, uint64_t flags,
55c7dc79 SL	108	size_t kbits, size_t blkbits, size_t ivbits)
3a9f26f3 SL	109	{
	110	PROV_AES_XTS_CTX ctx = OPENSSL_zalloc(sizeof(ctx));
	111
	112	if (ctx != NULL) {
55c7dc79	113	cipher_generic_initkey(&ctx->base, kbits, blkbits, ivbits, mode, flags,
3a9f26f3 SL	114	PROV_CIPHER_HW_aes_xts(kbits), NULL);
	115	}
	116	return ctx;
	117	}
	118
	119	static void aes_xts_freectx(void *vctx)
	120	{
	121	PROV_AES_XTS_CTX ctx = (PROV_AES_XTS_CTX )vctx;
	122
	123	OPENSSL_clear_free(ctx, sizeof(*ctx));
	124	}
	125
	126	static void aes_xts_dupctx(void vctx)
	127	{
	128	PROV_AES_XTS_CTX in = (PROV_AES_XTS_CTX )vctx;
	129	PROV_AES_XTS_CTX *ret = NULL;
	130
	131	if (in->xts.key1 != NULL) {
	132	if (in->xts.key1 != &in->ks1)
	133	return NULL;
	134	}
	135	if (in->xts.key2 != NULL) {
	136	if (in->xts.key2 != &in->ks2)
	137	return NULL;
	138	}
	139	ret = OPENSSL_malloc(sizeof(*ret));
	140	if (ret == NULL) {
	141	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
	142	return NULL;
	143	}
f75abcc0	144	in->base.hw->copyctx(&ret->base, &in->base);
3a9f26f3 SL	145	return ret;
	146	}
	147
	148	static int aes_xts_cipher(void vctx, unsigned char out, size_t *outl,
	149	size_t outsize, const unsigned char *in, size_t inl)
	150	{
	151	PROV_AES_XTS_CTX ctx = (PROV_AES_XTS_CTX )vctx;
	152
	153	if (ctx->xts.key1 == NULL
	154	\|\| ctx->xts.key2 == NULL
089cb623	155	\|\| !ctx->base.iv_set
3a9f26f3 SL	156	\|\| out == NULL
	157	\|\| in == NULL
	158	\|\| inl < AES_BLOCK_SIZE)
	159	return 0;
	160
	161	/*
79c44b4e	162	* Impose a limit of 2^20 blocks per data unit as specified by
3a9f26f3 SL	163	* IEEE Std 1619-2018. The earlier and obsolete IEEE Std 1619-2007
	164	* indicated that this was a SHOULD NOT rather than a MUST NOT.
	165	* NIST SP 800-38E mandates the same limit.
	166	*/
	167	if (inl > XTS_MAX_BLOCKS_PER_DATA_UNIT * AES_BLOCK_SIZE) {
	168	ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DATA_UNIT_IS_TOO_LARGE);
	169	return 0;
	170	}
	171
	172	if (ctx->stream != NULL)
	173	(*ctx->stream)(in, out, inl, ctx->xts.key1, ctx->xts.key2, ctx->base.iv);
	174	else if (CRYPTO_xts128_encrypt(&ctx->xts, ctx->base.iv, in, out, inl,
	175	ctx->base.enc))
	176	return 0;
3a9f26f3 SL	177
	178	*outl = inl;
	179	return 1;
	180	}
	181
	182	static int aes_xts_stream_update(void vctx, unsigned char out, size_t *outl,
	183	size_t outsize, const unsigned char *in,
	184	size_t inl)
	185	{
	186	PROV_AES_XTS_CTX ctx = (PROV_AES_XTS_CTX )vctx;
	187
	188	if (outsize < inl) {
	189	ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
	190	return 0;
	191	}
	192
	193	if (!aes_xts_cipher(ctx, out, outl, outsize, in, inl)) {
	194	ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
	195	return 0;
	196	}
	197
3a9f26f3 SL	198	return 1;
	199	}
	200
	201	static int aes_xts_stream_final(void vctx, unsigned char out, size_t *outl,
	202	size_t outsize)
	203	{
	204	*outl = 0;
	205	return 1;
	206	}
	207
	208	static const OSSL_PARAM aes_xts_known_settable_ctx_params[] = {
	209	OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
	210	OSSL_PARAM_END
	211	};
	212
	213	static const OSSL_PARAM *aes_xts_settable_ctx_params(void)
	214	{
	215	return aes_xts_known_settable_ctx_params;
	216	}
	217
	218	static int aes_xts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
	219	{
	220	PROV_CIPHER_CTX ctx = (PROV_CIPHER_CTX )vctx;
	221	const OSSL_PARAM *p;
	222
	223	/*
	224	* TODO(3.0) We need a general solution for handling missing parameters
	225	* inside set_params and get_params methods.
	226	*/
	227	p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
	228	if (p != NULL) {
	229	size_t keylen;
	230
	231	if (!OSSL_PARAM_get_size_t(p, &keylen)) {
	232	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
	233	return 0;
	234	}
	235	/* The key length can not be modified for xts mode */
	236	if (keylen != ctx->keylen)
	237	return 0;
	238	}
	239
	240	return 1;
	241	}
	242
	243	#define IMPLEMENT_cipher(lcmode, UCMODE, kbits, flags) \
363b1e5d	244	static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##lcmode##_get_params; \
3a9f26f3 SL	245	static int aes_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
	246	{ \
	247	return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
	248	flags, 2 * kbits, AES_XTS_BLOCK_BITS, \
	249	AES_XTS_IV_BITS); \
	250	} \
363b1e5d	251	static OSSL_FUNC_cipher_newctx_fn aes_##kbits##_xts_newctx; \
3a9f26f3 SL	252	static void aes_##kbits##_xts_newctx(void provctx) \
3a9f26f3 SL	253	{ \
55c7dc79	254	return aes_xts_newctx(provctx, EVP_CIPH_##UCMODE##_MODE, flags, 2 * kbits, \
3a9f26f3 SL	255	AES_XTS_BLOCK_BITS, AES_XTS_IV_BITS); \
	256	} \
	257	const OSSL_DISPATCH aes##kbits##xts_functions[] = { \
	258	{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))aes_##kbits##_xts_newctx }, \
	259	{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_xts_einit }, \
	260	{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_xts_dinit }, \
	261	{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_xts_stream_update }, \
	262	{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_xts_stream_final }, \
	263	{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_xts_cipher }, \
	264	{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_xts_freectx }, \
	265	{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_xts_dupctx }, \
	266	{ OSSL_FUNC_CIPHER_GET_PARAMS, \
	267	(void (*)(void))aes_##kbits##_##lcmode##_get_params }, \
	268	{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
	269	(void (*)(void))cipher_generic_gettable_params }, \
	270	{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
	271	(void (*)(void))cipher_generic_get_ctx_params }, \
	272	{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
	273	(void (*)(void))cipher_generic_gettable_ctx_params }, \
	274	{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
	275	(void (*)(void))aes_xts_set_ctx_params }, \
	276	{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
	277	(void (*)(void))aes_xts_settable_ctx_params }, \
	278	{ 0, NULL } \
	279	}
	280
	281	IMPLEMENT_cipher(xts, XTS, 256, AES_XTS_FLAGS);
	282	IMPLEMENT_cipher(xts, XTS, 128, AES_XTS_FLAGS);