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


/*
 * Copyright 2019-2021 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 <openssl/proverr.h>
#include "cipher_aes_xts.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"

#define AES_XTS_FLAGS PROV_CIPHER_FLAG_CUSTOM_IV
#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;

    if (!ossl_prov_is_running())
        return 0;

    ctx->enc = enc;

    if (iv != NULL) {
        if (!ossl_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) {
        ossl_cipher_generic_initkey(&ctx->base, kbits, blkbits, ivbits, mode,
                                    flags, ossl_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;

    ossl_cipher_generic_reset_ctx((PROV_CIPHER_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 (!ossl_prov_is_running())
        return 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 (!ossl_prov_is_running()
            || 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)
{
    if (!ossl_prov_is_running())
        return 0;
    *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(ossl_unused void *cctx,
                                                     ossl_unused void *provctx)
{
    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;

    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 ossl_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 ossl_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))ossl_cipher_generic_gettable_params },                   \
    { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,                                         \
      (void (*)(void))ossl_cipher_generic_get_ctx_params },                    \
    { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                    \
      (void (*)(void))ossl_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
1be63951	1
3a9f26f3	2	/*
a28d06f3	3	* Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
3a9f26f3 SL	4	*
	5	* Licensed under the Apache License 2.0 (the "License"). You may not use
	6	* this file except in compliance with the License. You can obtain a copy
	7	* in the file LICENSE in the source distribution or at
	8	* https://www.openssl.org/source/license.html
	9	*/
	10
c72fa255 MC	11	/*
	12	* AES low level APIs are deprecated for public use, but still ok for internal
	13	* use where we're using them to implement the higher level EVP interface, as is
	14	* the case here.
	15	*/
	16	#include "internal/deprecated.h"
	17
2741128e	18	#include <openssl/proverr.h>
3a9f26f3	19	#include "cipher_aes_xts.h"
af3e7e1b	20	#include "prov/implementations.h"
f99d3eed	21	#include "prov/providercommon.h"
3a9f26f3	22
a054d15c	23	#define AES_XTS_FLAGS PROV_CIPHER_FLAG_CUSTOM_IV
3a9f26f3 SL	24	#define AES_XTS_IV_BITS 128
	25	#define AES_XTS_BLOCK_BITS 8
	26
3a9f26f3	27	/* forward declarations */
363b1e5d DMSP	28	static OSSL_FUNC_cipher_encrypt_init_fn aes_xts_einit;
	29	static OSSL_FUNC_cipher_decrypt_init_fn aes_xts_dinit;
	30	static OSSL_FUNC_cipher_update_fn aes_xts_stream_update;
	31	static OSSL_FUNC_cipher_final_fn aes_xts_stream_final;
	32	static OSSL_FUNC_cipher_cipher_fn aes_xts_cipher;
	33	static OSSL_FUNC_cipher_freectx_fn aes_xts_freectx;
	34	static OSSL_FUNC_cipher_dupctx_fn aes_xts_dupctx;
	35	static OSSL_FUNC_cipher_set_ctx_params_fn aes_xts_set_ctx_params;
	36	static OSSL_FUNC_cipher_settable_ctx_params_fn aes_xts_settable_ctx_params;
3a9f26f3 SL	37
	38	/*
	39	* Verify that the two keys are different.
	40	*
	41	* This addresses the vulnerability described in Rogaway's
	42	* September 2004 paper:
	43	*
	44	* "Efficient Instantiations of Tweakable Blockciphers and
	45	* Refinements to Modes OCB and PMAC".
	46	* (http://web.cs.ucdavis.edu/~rogaway/papers/offsets.pdf)
	47	*
	48	* FIPS 140-2 IG A.9 XTS-AES Key Generation Requirements states
	49	* that:
	50	* "The check for Key_1 != Key_2 shall be done at any place
	51	* BEFORE using the keys in the XTS-AES algorithm to process
	52	* data with them."
	53	*/
	54	static int aes_xts_check_keys_differ(const unsigned char *key, size_t bytes,
	55	int enc)
	56	{
	57	if ((!allow_insecure_decrypt \|\| enc)
	58	&& CRYPTO_memcmp(key, key + bytes, bytes) == 0) {
	59	ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DUPLICATED_KEYS);
	60	return 0;
	61	}
	62	return 1;
	63	}
	64
	65	/*-
	66	* Provider dispatch functions
	67	*/
	68	static int aes_xts_init(void vctx, const unsigned char key, size_t keylen,
	69	const unsigned char *iv, size_t ivlen, int enc)
	70	{
	71	PROV_AES_XTS_CTX xctx = (PROV_AES_XTS_CTX )vctx;
	72	PROV_CIPHER_CTX *ctx = &xctx->base;
	73
f99d3eed P	74	if (!ossl_prov_is_running())
	75	return 0;
	76
3a9f26f3 SL	77	ctx->enc = enc;
	78
	79	if (iv != NULL) {
592dcfd3	80	if (!ossl_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) {
592dcfd3 P	113	ossl_cipher_generic_initkey(&ctx->base, kbits, blkbits, ivbits, mode,
	114	flags, ossl_prov_cipher_hw_aes_xts(kbits),
	115	NULL);
3a9f26f3 SL	116	}
	117	return ctx;
	118	}
	119
	120	static void aes_xts_freectx(void *vctx)
	121	{
	122	PROV_AES_XTS_CTX ctx = (PROV_AES_XTS_CTX )vctx;
	123
592dcfd3	124	ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
3a9f26f3 SL	125	OPENSSL_clear_free(ctx, sizeof(*ctx));
	126	}
	127
	128	static void aes_xts_dupctx(void vctx)
	129	{
	130	PROV_AES_XTS_CTX in = (PROV_AES_XTS_CTX )vctx;
	131	PROV_AES_XTS_CTX *ret = NULL;
	132
f99d3eed P	133	if (!ossl_prov_is_running())
	134	return NULL;
	135
3a9f26f3 SL	136	if (in->xts.key1 != NULL) {
	137	if (in->xts.key1 != &in->ks1)
	138	return NULL;
	139	}
	140	if (in->xts.key2 != NULL) {
	141	if (in->xts.key2 != &in->ks2)
	142	return NULL;
	143	}
	144	ret = OPENSSL_malloc(sizeof(*ret));
	145	if (ret == NULL) {
	146	ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
	147	return NULL;
	148	}
f75abcc0	149	in->base.hw->copyctx(&ret->base, &in->base);
3a9f26f3 SL	150	return ret;
	151	}
	152
	153	static int aes_xts_cipher(void vctx, unsigned char out, size_t *outl,
	154	size_t outsize, const unsigned char *in, size_t inl)
	155	{
	156	PROV_AES_XTS_CTX ctx = (PROV_AES_XTS_CTX )vctx;
	157
f99d3eed P	158	if (!ossl_prov_is_running()
f99d3eed P	159	\|\| ctx->xts.key1 == NULL
3a9f26f3	160	\|\| ctx->xts.key2 == NULL
089cb623	161	\|\| !ctx->base.iv_set
3a9f26f3 SL	162	\|\| out == NULL
	163	\|\| in == NULL
	164	\|\| inl < AES_BLOCK_SIZE)
	165	return 0;
	166
	167	/*
79c44b4e	168	* Impose a limit of 2^20 blocks per data unit as specified by
3a9f26f3 SL	169	* IEEE Std 1619-2018. The earlier and obsolete IEEE Std 1619-2007
	170	* indicated that this was a SHOULD NOT rather than a MUST NOT.
	171	* NIST SP 800-38E mandates the same limit.
	172	*/
	173	if (inl > XTS_MAX_BLOCKS_PER_DATA_UNIT * AES_BLOCK_SIZE) {
	174	ERR_raise(ERR_LIB_PROV, PROV_R_XTS_DATA_UNIT_IS_TOO_LARGE);
	175	return 0;
	176	}
	177
	178	if (ctx->stream != NULL)
	179	(*ctx->stream)(in, out, inl, ctx->xts.key1, ctx->xts.key2, ctx->base.iv);
	180	else if (CRYPTO_xts128_encrypt(&ctx->xts, ctx->base.iv, in, out, inl,
	181	ctx->base.enc))
	182	return 0;
3a9f26f3 SL	183
	184	*outl = inl;
	185	return 1;
	186	}
	187
	188	static int aes_xts_stream_update(void vctx, unsigned char out, size_t *outl,
	189	size_t outsize, const unsigned char *in,
	190	size_t inl)
	191	{
	192	PROV_AES_XTS_CTX ctx = (PROV_AES_XTS_CTX )vctx;
	193
	194	if (outsize < inl) {
	195	ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
	196	return 0;
	197	}
	198
	199	if (!aes_xts_cipher(ctx, out, outl, outsize, in, inl)) {
	200	ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
	201	return 0;
	202	}
	203
3a9f26f3 SL	204	return 1;
	205	}
	206
	207	static int aes_xts_stream_final(void vctx, unsigned char out, size_t *outl,
	208	size_t outsize)
	209	{
f99d3eed P	210	if (!ossl_prov_is_running())
f99d3eed P	211	return 0;
3a9f26f3 SL	212	*outl = 0;
	213	return 1;
	214	}
	215
	216	static const OSSL_PARAM aes_xts_known_settable_ctx_params[] = {
	217	OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL),
	218	OSSL_PARAM_END
	219	};
	220
644c5dd3 P	221	static const OSSL_PARAM aes_xts_settable_ctx_params(ossl_unused void cctx,
644c5dd3 P	222	ossl_unused void *provctx)
3a9f26f3 SL	223	{
	224	return aes_xts_known_settable_ctx_params;
	225	}
	226
	227	static int aes_xts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
	228	{
	229	PROV_CIPHER_CTX ctx = (PROV_CIPHER_CTX )vctx;
	230	const OSSL_PARAM *p;
	231
3a9f26f3 SL	232	p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
	233	if (p != NULL) {
	234	size_t keylen;
	235
	236	if (!OSSL_PARAM_get_size_t(p, &keylen)) {
	237	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
	238	return 0;
	239	}
	240	/* The key length can not be modified for xts mode */
	241	if (keylen != ctx->keylen)
	242	return 0;
	243	}
	244
	245	return 1;
	246	}
	247
	248	#define IMPLEMENT_cipher(lcmode, UCMODE, kbits, flags) \
363b1e5d	249	static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##lcmode##_get_params; \
3a9f26f3 SL	250	static int aes_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
3a9f26f3 SL	251	{ \
592dcfd3	252	return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
3a9f26f3 SL	253	flags, 2 * kbits, AES_XTS_BLOCK_BITS, \
	254	AES_XTS_IV_BITS); \
	255	} \
363b1e5d	256	static OSSL_FUNC_cipher_newctx_fn aes_##kbits##_xts_newctx; \
3a9f26f3 SL	257	static void aes_##kbits##_xts_newctx(void provctx) \
3a9f26f3 SL	258	{ \
55c7dc79	259	return aes_xts_newctx(provctx, EVP_CIPH_##UCMODE##_MODE, flags, 2 * kbits, \
3a9f26f3 SL	260	AES_XTS_BLOCK_BITS, AES_XTS_IV_BITS); \
3a9f26f3 SL	261	} \
1be63951	262	const OSSL_DISPATCH ossl_aes##kbits##xts_functions[] = { \
3a9f26f3 SL	263	{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))aes_##kbits##_xts_newctx }, \
	264	{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_xts_einit }, \
	265	{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_xts_dinit }, \
	266	{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_xts_stream_update }, \
	267	{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_xts_stream_final }, \
	268	{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))aes_xts_cipher }, \
	269	{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_xts_freectx }, \
	270	{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))aes_xts_dupctx }, \
	271	{ OSSL_FUNC_CIPHER_GET_PARAMS, \
	272	(void (*)(void))aes_##kbits##_##lcmode##_get_params }, \
	273	{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
592dcfd3	274	(void (*)(void))ossl_cipher_generic_gettable_params }, \
3a9f26f3	275	{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
592dcfd3	276	(void (*)(void))ossl_cipher_generic_get_ctx_params }, \
3a9f26f3	277	{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
592dcfd3	278	(void (*)(void))ossl_cipher_generic_gettable_ctx_params }, \
3a9f26f3 SL	279	{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
	280	(void (*)(void))aes_xts_set_ctx_params }, \
	281	{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
	282	(void (*)(void))aes_xts_settable_ctx_params }, \
	283	{ 0, NULL } \
	284	}
	285
	286	IMPLEMENT_cipher(xts, XTS, 256, AES_XTS_FLAGS);
	287	IMPLEMENT_cipher(xts, XTS, 128, AES_XTS_FLAGS);