aes_s390.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Cryptographic API.
   4 *
   5 * s390 implementation of the AES Cipher Algorithm.
   6 *
   7 * s390 Version:
   8 *   Copyright IBM Corp. 2005, 2017
   9 *   Author(s): Jan Glauber (jang@de.ibm.com)
  10 *		Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
  11 *		Patrick Steuer <patrick.steuer@de.ibm.com>
  12 *		Harald Freudenberger <freude@de.ibm.com>
  13 *
  14 * Derived from "crypto/aes_generic.c"
  15 */
  16
  17#define pr_fmt(fmt) "aes_s390: " fmt
  18
  19#include <crypto/aes.h>
  20#include <crypto/algapi.h>
  21#include <crypto/ghash.h>
  22#include <crypto/internal/aead.h>
  23#include <crypto/internal/cipher.h>
  24#include <crypto/internal/skcipher.h>
  25#include <crypto/scatterwalk.h>
  26#include <linux/err.h>
  27#include <linux/module.h>
  28#include <linux/cpufeature.h>
  29#include <linux/init.h>
  30#include <linux/mutex.h>
  31#include <linux/fips.h>
  32#include <linux/string.h>
  33#include <crypto/xts.h>
  34#include <asm/cpacf.h>
  35
  36static u8 *ctrblk;
  37static DEFINE_MUTEX(ctrblk_lock);
  38
  39static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
  40		    kma_functions;
  41
  42struct s390_aes_ctx {
  43	u8 key[AES_MAX_KEY_SIZE];
  44	int key_len;
  45	unsigned long fc;
  46	union {
  47		struct crypto_skcipher *skcipher;
  48		struct crypto_cipher *cip;
  49	} fallback;
  50};
  51
  52struct s390_xts_ctx {
  53	union {
  54		u8 keys[64];
  55		struct {
  56			u8 key[32];
  57			u8 pcc_key[32];
  58		};
  59	};
  60	int key_len;
  61	unsigned long fc;
  62	struct crypto_skcipher *fallback;
  63};
  64
  65struct gcm_sg_walk {
  66	struct scatter_walk walk;
  67	unsigned int walk_bytes;
  68	unsigned int walk_bytes_remain;
  69	u8 buf[AES_BLOCK_SIZE];
  70	unsigned int buf_bytes;
  71	u8 *ptr;
  72	unsigned int nbytes;
  73};
  74
  75static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
  76		unsigned int key_len)
  77{
  78	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
  79
  80	sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
  81	sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
  82			CRYPTO_TFM_REQ_MASK);
  83
  84	return crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
  85}
  86
  87static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
  88		       unsigned int key_len)
  89{
  90	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
  91	unsigned long fc;
  92
  93	/* Pick the correct function code based on the key length */
  94	fc = (key_len == 16) ? CPACF_KM_AES_128 :
  95	     (key_len == 24) ? CPACF_KM_AES_192 :
  96	     (key_len == 32) ? CPACF_KM_AES_256 : 0;
  97
  98	/* Check if the function code is available */
  99	sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
 100	if (!sctx->fc)
 101		return setkey_fallback_cip(tfm, in_key, key_len);
 102
 103	sctx->key_len = key_len;
 104	memcpy(sctx->key, in_key, key_len);
 105	return 0;
 106}
 107
 108static void crypto_aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 109{
 110	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 111
 112	if (unlikely(!sctx->fc)) {
 113		crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
 114		return;
 115	}
 116	cpacf_km(sctx->fc, &sctx->key, out, in, AES_BLOCK_SIZE);
 117}
 118
 119static void crypto_aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 120{
 121	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 122
 123	if (unlikely(!sctx->fc)) {
 124		crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
 125		return;
 126	}
 127	cpacf_km(sctx->fc | CPACF_DECRYPT,
 128		 &sctx->key, out, in, AES_BLOCK_SIZE);
 129}
 130
 131static int fallback_init_cip(struct crypto_tfm *tfm)
 132{
 133	const char *name = tfm->__crt_alg->cra_name;
 134	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 135
 136	sctx->fallback.cip = crypto_alloc_cipher(name, 0,
 137						 CRYPTO_ALG_NEED_FALLBACK);
 138
 139	if (IS_ERR(sctx->fallback.cip)) {
 140		pr_err("Allocating AES fallback algorithm %s failed\n",
 141		       name);
 142		return PTR_ERR(sctx->fallback.cip);
 143	}
 144
 145	return 0;
 146}
 147
 148static void fallback_exit_cip(struct crypto_tfm *tfm)
 149{
 150	struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
 151
 152	crypto_free_cipher(sctx->fallback.cip);
 153	sctx->fallback.cip = NULL;
 154}
 155
 156static struct crypto_alg aes_alg = {
 157	.cra_name		=	"aes",
 158	.cra_driver_name	=	"aes-s390",
 159	.cra_priority		=	300,
 160	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER |
 161					CRYPTO_ALG_NEED_FALLBACK,
 162	.cra_blocksize		=	AES_BLOCK_SIZE,
 163	.cra_ctxsize		=	sizeof(struct s390_aes_ctx),
 164	.cra_module		=	THIS_MODULE,
 165	.cra_init               =       fallback_init_cip,
 166	.cra_exit               =       fallback_exit_cip,
 167	.cra_u			=	{
 168		.cipher = {
 169			.cia_min_keysize	=	AES_MIN_KEY_SIZE,
 170			.cia_max_keysize	=	AES_MAX_KEY_SIZE,
 171			.cia_setkey		=	aes_set_key,
 172			.cia_encrypt		=	crypto_aes_encrypt,
 173			.cia_decrypt		=	crypto_aes_decrypt,
 174		}
 175	}
 176};
 177
 178static int setkey_fallback_skcipher(struct crypto_skcipher *tfm, const u8 *key,
 179				    unsigned int len)
 180{
 181	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 182
 183	crypto_skcipher_clear_flags(sctx->fallback.skcipher,
 184				    CRYPTO_TFM_REQ_MASK);
 185	crypto_skcipher_set_flags(sctx->fallback.skcipher,
 186				  crypto_skcipher_get_flags(tfm) &
 187				  CRYPTO_TFM_REQ_MASK);
 188	return crypto_skcipher_setkey(sctx->fallback.skcipher, key, len);
 189}
 190
 191static int fallback_skcipher_crypt(struct s390_aes_ctx *sctx,
 192				   struct skcipher_request *req,
 193				   unsigned long modifier)
 194{
 195	struct skcipher_request *subreq = skcipher_request_ctx(req);
 196
 197	*subreq = *req;
 198	skcipher_request_set_tfm(subreq, sctx->fallback.skcipher);
 199	return (modifier & CPACF_DECRYPT) ?
 200		crypto_skcipher_decrypt(subreq) :
 201		crypto_skcipher_encrypt(subreq);
 202}
 203
 204static int ecb_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 205			   unsigned int key_len)
 206{
 207	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 208	unsigned long fc;
 209
 210	/* Pick the correct function code based on the key length */
 211	fc = (key_len == 16) ? CPACF_KM_AES_128 :
 212	     (key_len == 24) ? CPACF_KM_AES_192 :
 213	     (key_len == 32) ? CPACF_KM_AES_256 : 0;
 214
 215	/* Check if the function code is available */
 216	sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
 217	if (!sctx->fc)
 218		return setkey_fallback_skcipher(tfm, in_key, key_len);
 219
 220	sctx->key_len = key_len;
 221	memcpy(sctx->key, in_key, key_len);
 222	return 0;
 223}
 224
 225static int ecb_aes_crypt(struct skcipher_request *req, unsigned long modifier)
 226{
 227	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 228	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 229	struct skcipher_walk walk;
 230	unsigned int nbytes, n;
 231	int ret;
 232
 233	if (unlikely(!sctx->fc))
 234		return fallback_skcipher_crypt(sctx, req, modifier);
 235
 236	ret = skcipher_walk_virt(&walk, req, false);
 237	while ((nbytes = walk.nbytes) != 0) {
 238		/* only use complete blocks */
 239		n = nbytes & ~(AES_BLOCK_SIZE - 1);
 240		cpacf_km(sctx->fc | modifier, sctx->key,
 241			 walk.dst.virt.addr, walk.src.virt.addr, n);
 242		ret = skcipher_walk_done(&walk, nbytes - n);
 243	}
 244	return ret;
 245}
 246
 247static int ecb_aes_encrypt(struct skcipher_request *req)
 248{
 249	return ecb_aes_crypt(req, 0);
 250}
 251
 252static int ecb_aes_decrypt(struct skcipher_request *req)
 253{
 254	return ecb_aes_crypt(req, CPACF_DECRYPT);
 255}
 256
 257static int fallback_init_skcipher(struct crypto_skcipher *tfm)
 258{
 259	const char *name = crypto_tfm_alg_name(&tfm->base);
 260	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 261
 262	sctx->fallback.skcipher = crypto_alloc_skcipher(name, 0,
 263				CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC);
 264
 265	if (IS_ERR(sctx->fallback.skcipher)) {
 266		pr_err("Allocating AES fallback algorithm %s failed\n",
 267		       name);
 268		return PTR_ERR(sctx->fallback.skcipher);
 269	}
 270
 271	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
 272				    crypto_skcipher_reqsize(sctx->fallback.skcipher));
 273	return 0;
 274}
 275
 276static void fallback_exit_skcipher(struct crypto_skcipher *tfm)
 277{
 278	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 279
 280	crypto_free_skcipher(sctx->fallback.skcipher);
 281}
 282
 283static struct skcipher_alg ecb_aes_alg = {
 284	.base.cra_name		=	"ecb(aes)",
 285	.base.cra_driver_name	=	"ecb-aes-s390",
 286	.base.cra_priority	=	401,	/* combo: aes + ecb + 1 */
 287	.base.cra_flags		=	CRYPTO_ALG_NEED_FALLBACK,
 288	.base.cra_blocksize	=	AES_BLOCK_SIZE,
 289	.base.cra_ctxsize	=	sizeof(struct s390_aes_ctx),
 290	.base.cra_module	=	THIS_MODULE,
 291	.init			=	fallback_init_skcipher,
 292	.exit			=	fallback_exit_skcipher,
 293	.min_keysize		=	AES_MIN_KEY_SIZE,
 294	.max_keysize		=	AES_MAX_KEY_SIZE,
 295	.setkey			=	ecb_aes_set_key,
 296	.encrypt		=	ecb_aes_encrypt,
 297	.decrypt		=	ecb_aes_decrypt,
 298};
 299
 300static int cbc_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 301			   unsigned int key_len)
 302{
 303	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 304	unsigned long fc;
 305
 306	/* Pick the correct function code based on the key length */
 307	fc = (key_len == 16) ? CPACF_KMC_AES_128 :
 308	     (key_len == 24) ? CPACF_KMC_AES_192 :
 309	     (key_len == 32) ? CPACF_KMC_AES_256 : 0;
 310
 311	/* Check if the function code is available */
 312	sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
 313	if (!sctx->fc)
 314		return setkey_fallback_skcipher(tfm, in_key, key_len);
 315
 316	sctx->key_len = key_len;
 317	memcpy(sctx->key, in_key, key_len);
 318	return 0;
 319}
 320
 321static int cbc_aes_crypt(struct skcipher_request *req, unsigned long modifier)
 322{
 323	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 324	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 325	struct skcipher_walk walk;
 326	unsigned int nbytes, n;
 327	int ret;
 328	struct {
 329		u8 iv[AES_BLOCK_SIZE];
 330		u8 key[AES_MAX_KEY_SIZE];
 331	} param;
 332
 333	if (unlikely(!sctx->fc))
 334		return fallback_skcipher_crypt(sctx, req, modifier);
 335
 336	ret = skcipher_walk_virt(&walk, req, false);
 337	if (ret)
 338		return ret;
 339	memcpy(param.iv, walk.iv, AES_BLOCK_SIZE);
 340	memcpy(param.key, sctx->key, sctx->key_len);
 341	while ((nbytes = walk.nbytes) != 0) {
 342		/* only use complete blocks */
 343		n = nbytes & ~(AES_BLOCK_SIZE - 1);
 344		cpacf_kmc(sctx->fc | modifier, &param,
 345			  walk.dst.virt.addr, walk.src.virt.addr, n);
 346		memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
 347		ret = skcipher_walk_done(&walk, nbytes - n);
 348	}
 349	memzero_explicit(&param, sizeof(param));
 350	return ret;
 351}
 352
 353static int cbc_aes_encrypt(struct skcipher_request *req)
 354{
 355	return cbc_aes_crypt(req, 0);
 356}
 357
 358static int cbc_aes_decrypt(struct skcipher_request *req)
 359{
 360	return cbc_aes_crypt(req, CPACF_DECRYPT);
 361}
 362
 363static struct skcipher_alg cbc_aes_alg = {
 364	.base.cra_name		=	"cbc(aes)",
 365	.base.cra_driver_name	=	"cbc-aes-s390",
 366	.base.cra_priority	=	402,	/* ecb-aes-s390 + 1 */
 367	.base.cra_flags		=	CRYPTO_ALG_NEED_FALLBACK,
 368	.base.cra_blocksize	=	AES_BLOCK_SIZE,
 369	.base.cra_ctxsize	=	sizeof(struct s390_aes_ctx),
 370	.base.cra_module	=	THIS_MODULE,
 371	.init			=	fallback_init_skcipher,
 372	.exit			=	fallback_exit_skcipher,
 373	.min_keysize		=	AES_MIN_KEY_SIZE,
 374	.max_keysize		=	AES_MAX_KEY_SIZE,
 375	.ivsize			=	AES_BLOCK_SIZE,
 376	.setkey			=	cbc_aes_set_key,
 377	.encrypt		=	cbc_aes_encrypt,
 378	.decrypt		=	cbc_aes_decrypt,
 379};
 380
 381static int xts_fallback_setkey(struct crypto_skcipher *tfm, const u8 *key,
 382			       unsigned int len)
 383{
 384	struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
 385
 386	crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK);
 387	crypto_skcipher_set_flags(xts_ctx->fallback,
 388				  crypto_skcipher_get_flags(tfm) &
 389				  CRYPTO_TFM_REQ_MASK);
 390	return crypto_skcipher_setkey(xts_ctx->fallback, key, len);
 391}
 392
 393static int xts_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 394			   unsigned int key_len)
 395{
 396	struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
 397	unsigned long fc;
 398	int err;
 399
 400	err = xts_fallback_setkey(tfm, in_key, key_len);
 401	if (err)
 402		return err;
 403
 404	/* Pick the correct function code based on the key length */
 405	fc = (key_len == 32) ? CPACF_KM_XTS_128 :
 406	     (key_len == 64) ? CPACF_KM_XTS_256 : 0;
 407
 408	/* Check if the function code is available */
 409	xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
 410	if (!xts_ctx->fc)
 411		return 0;
 412
 413	/* Split the XTS key into the two subkeys */
 414	key_len = key_len / 2;
 415	xts_ctx->key_len = key_len;
 416	memcpy(xts_ctx->key, in_key, key_len);
 417	memcpy(xts_ctx->pcc_key, in_key + key_len, key_len);
 418	return 0;
 419}
 420
 421static int xts_aes_crypt(struct skcipher_request *req, unsigned long modifier)
 422{
 423	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 424	struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
 425	struct skcipher_walk walk;
 426	unsigned int offset, nbytes, n;
 427	int ret;
 428	struct {
 429		u8 key[32];
 430		u8 tweak[16];
 431		u8 block[16];
 432		u8 bit[16];
 433		u8 xts[16];
 434	} pcc_param;
 435	struct {
 436		u8 key[32];
 437		u8 init[16];
 438	} xts_param;
 439
 440	if (req->cryptlen < AES_BLOCK_SIZE)
 441		return -EINVAL;
 442
 443	if (unlikely(!xts_ctx->fc || (req->cryptlen % AES_BLOCK_SIZE) != 0)) {
 444		struct skcipher_request *subreq = skcipher_request_ctx(req);
 445
 446		*subreq = *req;
 447		skcipher_request_set_tfm(subreq, xts_ctx->fallback);
 448		return (modifier & CPACF_DECRYPT) ?
 449			crypto_skcipher_decrypt(subreq) :
 450			crypto_skcipher_encrypt(subreq);
 451	}
 452
 453	ret = skcipher_walk_virt(&walk, req, false);
 454	if (ret)
 455		return ret;
 456	offset = xts_ctx->key_len & 0x10;
 457	memset(pcc_param.block, 0, sizeof(pcc_param.block));
 458	memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
 459	memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
 460	memcpy(pcc_param.tweak, walk.iv, sizeof(pcc_param.tweak));
 461	memcpy(pcc_param.key + offset, xts_ctx->pcc_key, xts_ctx->key_len);
 462	cpacf_pcc(xts_ctx->fc, pcc_param.key + offset);
 463
 464	memcpy(xts_param.key + offset, xts_ctx->key, xts_ctx->key_len);
 465	memcpy(xts_param.init, pcc_param.xts, 16);
 466
 467	while ((nbytes = walk.nbytes) != 0) {
 468		/* only use complete blocks */
 469		n = nbytes & ~(AES_BLOCK_SIZE - 1);
 470		cpacf_km(xts_ctx->fc | modifier, xts_param.key + offset,
 471			 walk.dst.virt.addr, walk.src.virt.addr, n);
 472		ret = skcipher_walk_done(&walk, nbytes - n);
 473	}
 474	memzero_explicit(&pcc_param, sizeof(pcc_param));
 475	memzero_explicit(&xts_param, sizeof(xts_param));
 476	return ret;
 477}
 478
 479static int xts_aes_encrypt(struct skcipher_request *req)
 480{
 481	return xts_aes_crypt(req, 0);
 482}
 483
 484static int xts_aes_decrypt(struct skcipher_request *req)
 485{
 486	return xts_aes_crypt(req, CPACF_DECRYPT);
 487}
 488
 489static int xts_fallback_init(struct crypto_skcipher *tfm)
 490{
 491	const char *name = crypto_tfm_alg_name(&tfm->base);
 492	struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
 493
 494	xts_ctx->fallback = crypto_alloc_skcipher(name, 0,
 495				CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC);
 496
 497	if (IS_ERR(xts_ctx->fallback)) {
 498		pr_err("Allocating XTS fallback algorithm %s failed\n",
 499		       name);
 500		return PTR_ERR(xts_ctx->fallback);
 501	}
 502	crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
 503				    crypto_skcipher_reqsize(xts_ctx->fallback));
 504	return 0;
 505}
 506
 507static void xts_fallback_exit(struct crypto_skcipher *tfm)
 508{
 509	struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
 510
 511	crypto_free_skcipher(xts_ctx->fallback);
 512}
 513
 514static struct skcipher_alg xts_aes_alg = {
 515	.base.cra_name		=	"xts(aes)",
 516	.base.cra_driver_name	=	"xts-aes-s390",
 517	.base.cra_priority	=	402,	/* ecb-aes-s390 + 1 */
 518	.base.cra_flags		=	CRYPTO_ALG_NEED_FALLBACK,
 519	.base.cra_blocksize	=	AES_BLOCK_SIZE,
 520	.base.cra_ctxsize	=	sizeof(struct s390_xts_ctx),
 521	.base.cra_module	=	THIS_MODULE,
 522	.init			=	xts_fallback_init,
 523	.exit			=	xts_fallback_exit,
 524	.min_keysize		=	2 * AES_MIN_KEY_SIZE,
 525	.max_keysize		=	2 * AES_MAX_KEY_SIZE,
 526	.ivsize			=	AES_BLOCK_SIZE,
 527	.setkey			=	xts_aes_set_key,
 528	.encrypt		=	xts_aes_encrypt,
 529	.decrypt		=	xts_aes_decrypt,
 530};
 531
 532static int fullxts_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 533			       unsigned int key_len)
 534{
 535	struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
 536	unsigned long fc;
 537	int err;
 538
 539	err = xts_fallback_setkey(tfm, in_key, key_len);
 540	if (err)
 541		return err;
 542
 543	/* Pick the correct function code based on the key length */
 544	fc = (key_len == 32) ? CPACF_KM_XTS_128_FULL :
 545	     (key_len == 64) ? CPACF_KM_XTS_256_FULL : 0;
 546
 547	/* Check if the function code is available */
 548	xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
 549	if (!xts_ctx->fc)
 550		return 0;
 551
 552	/* Store double-key */
 553	memcpy(xts_ctx->keys, in_key, key_len);
 554	xts_ctx->key_len = key_len;
 555	return 0;
 556}
 557
 558static int fullxts_aes_crypt(struct skcipher_request *req,  unsigned long modifier)
 559{
 560	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 561	struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
 562	unsigned int offset, nbytes, n;
 563	struct skcipher_walk walk;
 564	int ret;
 565	struct {
 566		__u8 key[64];
 567		__u8 tweak[16];
 568		__u8 nap[16];
 569	} fxts_param = {
 570		.nap = {0},
 571	};
 572
 573	if (req->cryptlen < AES_BLOCK_SIZE)
 574		return -EINVAL;
 575
 576	if (unlikely(!xts_ctx->fc || (req->cryptlen % AES_BLOCK_SIZE) != 0)) {
 577		struct skcipher_request *subreq = skcipher_request_ctx(req);
 578
 579		*subreq = *req;
 580		skcipher_request_set_tfm(subreq, xts_ctx->fallback);
 581		return (modifier & CPACF_DECRYPT) ?
 582			crypto_skcipher_decrypt(subreq) :
 583			crypto_skcipher_encrypt(subreq);
 584	}
 585
 586	ret = skcipher_walk_virt(&walk, req, false);
 587	if (ret)
 588		return ret;
 589
 590	offset = xts_ctx->key_len & 0x20;
 591	memcpy(fxts_param.key + offset, xts_ctx->keys, xts_ctx->key_len);
 592	memcpy(fxts_param.tweak, req->iv, AES_BLOCK_SIZE);
 593	fxts_param.nap[0] = 0x01; /* initial alpha power (1, little-endian) */
 594
 595	while ((nbytes = walk.nbytes) != 0) {
 596		/* only use complete blocks */
 597		n = nbytes & ~(AES_BLOCK_SIZE - 1);
 598		cpacf_km(xts_ctx->fc | modifier, fxts_param.key + offset,
 599			 walk.dst.virt.addr, walk.src.virt.addr, n);
 600		ret = skcipher_walk_done(&walk, nbytes - n);
 601	}
 602	memzero_explicit(&fxts_param, sizeof(fxts_param));
 603	return ret;
 604}
 605
 606static int fullxts_aes_encrypt(struct skcipher_request *req)
 607{
 608	return fullxts_aes_crypt(req, 0);
 609}
 610
 611static int fullxts_aes_decrypt(struct skcipher_request *req)
 612{
 613	return fullxts_aes_crypt(req, CPACF_DECRYPT);
 614}
 615
 616static struct skcipher_alg fullxts_aes_alg = {
 617	.base.cra_name		=	"xts(aes)",
 618	.base.cra_driver_name	=	"full-xts-aes-s390",
 619	.base.cra_priority	=	403,	/* aes-xts-s390 + 1 */
 620	.base.cra_flags		=	CRYPTO_ALG_NEED_FALLBACK,
 621	.base.cra_blocksize	=	AES_BLOCK_SIZE,
 622	.base.cra_ctxsize	=	sizeof(struct s390_xts_ctx),
 623	.base.cra_module	=	THIS_MODULE,
 624	.init			=	xts_fallback_init,
 625	.exit			=	xts_fallback_exit,
 626	.min_keysize		=	2 * AES_MIN_KEY_SIZE,
 627	.max_keysize		=	2 * AES_MAX_KEY_SIZE,
 628	.ivsize			=	AES_BLOCK_SIZE,
 629	.setkey			=	fullxts_aes_set_key,
 630	.encrypt		=	fullxts_aes_encrypt,
 631	.decrypt		=	fullxts_aes_decrypt,
 632};
 633
 634static int ctr_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 635			   unsigned int key_len)
 636{
 637	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 638	unsigned long fc;
 639
 640	/* Pick the correct function code based on the key length */
 641	fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
 642	     (key_len == 24) ? CPACF_KMCTR_AES_192 :
 643	     (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
 644
 645	/* Check if the function code is available */
 646	sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
 647	if (!sctx->fc)
 648		return setkey_fallback_skcipher(tfm, in_key, key_len);
 649
 650	sctx->key_len = key_len;
 651	memcpy(sctx->key, in_key, key_len);
 652	return 0;
 653}
 654
 655static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
 656{
 657	unsigned int i, n;
 658
 659	/* only use complete blocks, max. PAGE_SIZE */
 660	memcpy(ctrptr, iv, AES_BLOCK_SIZE);
 661	n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
 662	for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
 663		memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
 664		crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
 665		ctrptr += AES_BLOCK_SIZE;
 666	}
 667	return n;
 668}
 669
 670static int ctr_aes_crypt(struct skcipher_request *req)
 671{
 672	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 673	struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
 674	u8 buf[AES_BLOCK_SIZE], *ctrptr;
 675	struct skcipher_walk walk;
 676	unsigned int n, nbytes;
 677	int ret, locked;
 678
 679	if (unlikely(!sctx->fc))
 680		return fallback_skcipher_crypt(sctx, req, 0);
 681
 682	locked = mutex_trylock(&ctrblk_lock);
 683
 684	ret = skcipher_walk_virt(&walk, req, false);
 685	while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
 686		n = AES_BLOCK_SIZE;
 687
 688		if (nbytes >= 2*AES_BLOCK_SIZE && locked)
 689			n = __ctrblk_init(ctrblk, walk.iv, nbytes);
 690		ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk.iv;
 691		cpacf_kmctr(sctx->fc, sctx->key, walk.dst.virt.addr,
 692			    walk.src.virt.addr, n, ctrptr);
 693		if (ctrptr == ctrblk)
 694			memcpy(walk.iv, ctrptr + n - AES_BLOCK_SIZE,
 695			       AES_BLOCK_SIZE);
 696		crypto_inc(walk.iv, AES_BLOCK_SIZE);
 697		ret = skcipher_walk_done(&walk, nbytes - n);
 698	}
 699	if (locked)
 700		mutex_unlock(&ctrblk_lock);
 701	/*
 702	 * final block may be < AES_BLOCK_SIZE, copy only nbytes
 703	 */
 704	if (nbytes) {
 705		memset(buf, 0, AES_BLOCK_SIZE);
 706		memcpy(buf, walk.src.virt.addr, nbytes);
 707		cpacf_kmctr(sctx->fc, sctx->key, buf, buf,
 708			    AES_BLOCK_SIZE, walk.iv);
 709		memcpy(walk.dst.virt.addr, buf, nbytes);
 710		crypto_inc(walk.iv, AES_BLOCK_SIZE);
 711		ret = skcipher_walk_done(&walk, 0);
 712	}
 713
 714	return ret;
 715}
 716
 717static struct skcipher_alg ctr_aes_alg = {
 718	.base.cra_name		=	"ctr(aes)",
 719	.base.cra_driver_name	=	"ctr-aes-s390",
 720	.base.cra_priority	=	402,	/* ecb-aes-s390 + 1 */
 721	.base.cra_flags		=	CRYPTO_ALG_NEED_FALLBACK,
 722	.base.cra_blocksize	=	1,
 723	.base.cra_ctxsize	=	sizeof(struct s390_aes_ctx),
 724	.base.cra_module	=	THIS_MODULE,
 725	.init			=	fallback_init_skcipher,
 726	.exit			=	fallback_exit_skcipher,
 727	.min_keysize		=	AES_MIN_KEY_SIZE,
 728	.max_keysize		=	AES_MAX_KEY_SIZE,
 729	.ivsize			=	AES_BLOCK_SIZE,
 730	.setkey			=	ctr_aes_set_key,
 731	.encrypt		=	ctr_aes_crypt,
 732	.decrypt		=	ctr_aes_crypt,
 733	.chunksize		=	AES_BLOCK_SIZE,
 734};
 735
 736static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
 737			  unsigned int keylen)
 738{
 739	struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
 740
 741	switch (keylen) {
 742	case AES_KEYSIZE_128:
 743		ctx->fc = CPACF_KMA_GCM_AES_128;
 744		break;
 745	case AES_KEYSIZE_192:
 746		ctx->fc = CPACF_KMA_GCM_AES_192;
 747		break;
 748	case AES_KEYSIZE_256:
 749		ctx->fc = CPACF_KMA_GCM_AES_256;
 750		break;
 751	default:
 752		return -EINVAL;
 753	}
 754
 755	memcpy(ctx->key, key, keylen);
 756	ctx->key_len = keylen;
 757	return 0;
 758}
 759
 760static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 761{
 762	switch (authsize) {
 763	case 4:
 764	case 8:
 765	case 12:
 766	case 13:
 767	case 14:
 768	case 15:
 769	case 16:
 770		break;
 771	default:
 772		return -EINVAL;
 773	}
 774
 775	return 0;
 776}
 777
 778static void gcm_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
 779			   unsigned int len)
 780{
 781	memset(gw, 0, sizeof(*gw));
 782	gw->walk_bytes_remain = len;
 783	scatterwalk_start(&gw->walk, sg);
 784}
 785
 786static inline unsigned int _gcm_sg_clamp_and_map(struct gcm_sg_walk *gw)
 787{
 788	if (gw->walk_bytes_remain == 0)
 789		return 0;
 790	gw->walk_bytes = scatterwalk_next(&gw->walk, gw->walk_bytes_remain);
 791	return gw->walk_bytes;
 792}
 793
 794static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
 795					     unsigned int nbytes, bool out)
 796{
 797	gw->walk_bytes_remain -= nbytes;
 798	if (out)
 799		scatterwalk_done_dst(&gw->walk, nbytes);
 800	else
 801		scatterwalk_done_src(&gw->walk, nbytes);
 802}
 803
 804static int gcm_in_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
 805{
 806	int n;
 807
 808	if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
 809		gw->ptr = gw->buf;
 810		gw->nbytes = gw->buf_bytes;
 811		goto out;
 812	}
 813
 814	if (gw->walk_bytes_remain == 0) {
 815		gw->ptr = NULL;
 816		gw->nbytes = 0;
 817		goto out;
 818	}
 819
 820	if (!_gcm_sg_clamp_and_map(gw)) {
 821		gw->ptr = NULL;
 822		gw->nbytes = 0;
 823		goto out;
 824	}
 825
 826	if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
 827		gw->ptr = gw->walk.addr;
 828		gw->nbytes = gw->walk_bytes;
 829		goto out;
 830	}
 831
 832	while (1) {
 833		n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
 834		memcpy(gw->buf + gw->buf_bytes, gw->walk.addr, n);
 835		gw->buf_bytes += n;
 836		_gcm_sg_unmap_and_advance(gw, n, false);
 837		if (gw->buf_bytes >= minbytesneeded) {
 838			gw->ptr = gw->buf;
 839			gw->nbytes = gw->buf_bytes;
 840			goto out;
 841		}
 842		if (!_gcm_sg_clamp_and_map(gw)) {
 843			gw->ptr = NULL;
 844			gw->nbytes = 0;
 845			goto out;
 846		}
 847	}
 848
 849out:
 850	return gw->nbytes;
 851}
 852
 853static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
 854{
 855	if (gw->walk_bytes_remain == 0) {
 856		gw->ptr = NULL;
 857		gw->nbytes = 0;
 858		goto out;
 859	}
 860
 861	if (!_gcm_sg_clamp_and_map(gw)) {
 862		gw->ptr = NULL;
 863		gw->nbytes = 0;
 864		goto out;
 865	}
 866
 867	if (gw->walk_bytes >= minbytesneeded) {
 868		gw->ptr = gw->walk.addr;
 869		gw->nbytes = gw->walk_bytes;
 870		goto out;
 871	}
 872
 873	scatterwalk_unmap(&gw->walk);
 874
 875	gw->ptr = gw->buf;
 876	gw->nbytes = sizeof(gw->buf);
 877
 878out:
 879	return gw->nbytes;
 880}
 881
 882static int gcm_in_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
 883{
 884	if (gw->ptr == NULL)
 885		return 0;
 886
 887	if (gw->ptr == gw->buf) {
 888		int n = gw->buf_bytes - bytesdone;
 889		if (n > 0) {
 890			memmove(gw->buf, gw->buf + bytesdone, n);
 891			gw->buf_bytes = n;
 892		} else
 893			gw->buf_bytes = 0;
 894	} else
 895		_gcm_sg_unmap_and_advance(gw, bytesdone, false);
 896
 897	return bytesdone;
 898}
 899
 900static int gcm_out_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
 901{
 902	int i, n;
 903
 904	if (gw->ptr == NULL)
 905		return 0;
 906
 907	if (gw->ptr == gw->buf) {
 908		for (i = 0; i < bytesdone; i += n) {
 909			if (!_gcm_sg_clamp_and_map(gw))
 910				return i;
 911			n = min(gw->walk_bytes, bytesdone - i);
 912			memcpy(gw->walk.addr, gw->buf + i, n);
 913			_gcm_sg_unmap_and_advance(gw, n, true);
 914		}
 915	} else
 916		_gcm_sg_unmap_and_advance(gw, bytesdone, true);
 917
 918	return bytesdone;
 919}
 920
 921static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
 922{
 923	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 924	struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
 925	unsigned int ivsize = crypto_aead_ivsize(tfm);
 926	unsigned int taglen = crypto_aead_authsize(tfm);
 927	unsigned int aadlen = req->assoclen;
 928	unsigned int pclen = req->cryptlen;
 929	int ret = 0;
 930
 931	unsigned int n, len, in_bytes, out_bytes,
 932		     min_bytes, bytes, aad_bytes, pc_bytes;
 933	struct gcm_sg_walk gw_in, gw_out;
 934	u8 tag[GHASH_DIGEST_SIZE];
 935
 936	struct {
 937		u32 _[3];		/* reserved */
 938		u32 cv;			/* Counter Value */
 939		u8 t[GHASH_DIGEST_SIZE];/* Tag */
 940		u8 h[AES_BLOCK_SIZE];	/* Hash-subkey */
 941		u64 taadl;		/* Total AAD Length */
 942		u64 tpcl;		/* Total Plain-/Cipher-text Length */
 943		u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
 944		u8 k[AES_MAX_KEY_SIZE];	/* Key */
 945	} param;
 946
 947	/*
 948	 * encrypt
 949	 *   req->src: aad||plaintext
 950	 *   req->dst: aad||ciphertext||tag
 951	 * decrypt
 952	 *   req->src: aad||ciphertext||tag
 953	 *   req->dst: aad||plaintext, return 0 or -EBADMSG
 954	 * aad, plaintext and ciphertext may be empty.
 955	 */
 956	if (flags & CPACF_DECRYPT)
 957		pclen -= taglen;
 958	len = aadlen + pclen;
 959
 960	memset(&param, 0, sizeof(param));
 961	param.cv = 1;
 962	param.taadl = aadlen * 8;
 963	param.tpcl = pclen * 8;
 964	memcpy(param.j0, req->iv, ivsize);
 965	*(u32 *)(param.j0 + ivsize) = 1;
 966	memcpy(param.k, ctx->key, ctx->key_len);
 967
 968	gcm_walk_start(&gw_in, req->src, len);
 969	gcm_walk_start(&gw_out, req->dst, len);
 970
 971	do {
 972		min_bytes = min_t(unsigned int,
 973				  aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
 974		in_bytes = gcm_in_walk_go(&gw_in, min_bytes);
 975		out_bytes = gcm_out_walk_go(&gw_out, min_bytes);
 976		bytes = min(in_bytes, out_bytes);
 977
 978		if (aadlen + pclen <= bytes) {
 979			aad_bytes = aadlen;
 980			pc_bytes = pclen;
 981			flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
 982		} else {
 983			if (aadlen <= bytes) {
 984				aad_bytes = aadlen;
 985				pc_bytes = (bytes - aadlen) &
 986					   ~(AES_BLOCK_SIZE - 1);
 987				flags |= CPACF_KMA_LAAD;
 988			} else {
 989				aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
 990				pc_bytes = 0;
 991			}
 992		}
 993
 994		if (aad_bytes > 0)
 995			memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
 996
 997		cpacf_kma(ctx->fc | flags, &param,
 998			  gw_out.ptr + aad_bytes,
 999			  gw_in.ptr + aad_bytes, pc_bytes,
1000			  gw_in.ptr, aad_bytes);
1001
1002		n = aad_bytes + pc_bytes;
1003		if (gcm_in_walk_done(&gw_in, n) != n)
1004			return -ENOMEM;
1005		if (gcm_out_walk_done(&gw_out, n) != n)
1006			return -ENOMEM;
1007		aadlen -= aad_bytes;
1008		pclen -= pc_bytes;
1009	} while (aadlen + pclen > 0);
1010
1011	if (flags & CPACF_DECRYPT) {
1012		scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
1013		if (crypto_memneq(tag, param.t, taglen))
1014			ret = -EBADMSG;
1015	} else
1016		scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
1017
1018	memzero_explicit(&param, sizeof(param));
1019	return ret;
1020}
1021
1022static int gcm_aes_encrypt(struct aead_request *req)
1023{
1024	return gcm_aes_crypt(req, CPACF_ENCRYPT);
1025}
1026
1027static int gcm_aes_decrypt(struct aead_request *req)
1028{
1029	return gcm_aes_crypt(req, CPACF_DECRYPT);
1030}
1031
1032static struct aead_alg gcm_aes_aead = {
1033	.setkey			= gcm_aes_setkey,
1034	.setauthsize		= gcm_aes_setauthsize,
1035	.encrypt		= gcm_aes_encrypt,
1036	.decrypt		= gcm_aes_decrypt,
1037
1038	.ivsize			= GHASH_BLOCK_SIZE - sizeof(u32),
1039	.maxauthsize		= GHASH_DIGEST_SIZE,
1040	.chunksize		= AES_BLOCK_SIZE,
1041
1042	.base			= {
1043		.cra_blocksize		= 1,
1044		.cra_ctxsize		= sizeof(struct s390_aes_ctx),
1045		.cra_priority		= 900,
1046		.cra_name		= "gcm(aes)",
1047		.cra_driver_name	= "gcm-aes-s390",
1048		.cra_module		= THIS_MODULE,
1049	},
1050};
1051
1052static struct crypto_alg *aes_s390_alg;
1053static struct skcipher_alg *aes_s390_skcipher_algs[5];
1054static int aes_s390_skciphers_num;
1055static struct aead_alg *aes_s390_aead_alg;
1056
1057static int aes_s390_register_skcipher(struct skcipher_alg *alg)
1058{
1059	int ret;
1060
1061	ret = crypto_register_skcipher(alg);
1062	if (!ret)
1063		aes_s390_skcipher_algs[aes_s390_skciphers_num++] = alg;
1064	return ret;
1065}
1066
1067static void aes_s390_fini(void)
1068{
1069	if (aes_s390_alg)
1070		crypto_unregister_alg(aes_s390_alg);
1071	while (aes_s390_skciphers_num--)
1072		crypto_unregister_skcipher(aes_s390_skcipher_algs[aes_s390_skciphers_num]);
1073	if (ctrblk)
1074		free_page((unsigned long) ctrblk);
1075
1076	if (aes_s390_aead_alg)
1077		crypto_unregister_aead(aes_s390_aead_alg);
1078}
1079
1080static int __init aes_s390_init(void)
1081{
1082	int ret;
1083
1084	/* Query available functions for KM, KMC, KMCTR and KMA */
1085	cpacf_query(CPACF_KM, &km_functions);
1086	cpacf_query(CPACF_KMC, &kmc_functions);
1087	cpacf_query(CPACF_KMCTR, &kmctr_functions);
1088	cpacf_query(CPACF_KMA, &kma_functions);
1089
1090	if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
1091	    cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
1092	    cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
1093		ret = crypto_register_alg(&aes_alg);
1094		if (ret)
1095			goto out_err;
1096		aes_s390_alg = &aes_alg;
1097		ret = aes_s390_register_skcipher(&ecb_aes_alg);
1098		if (ret)
1099			goto out_err;
1100	}
1101
1102	if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
1103	    cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
1104	    cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
1105		ret = aes_s390_register_skcipher(&cbc_aes_alg);
1106		if (ret)
1107			goto out_err;
1108	}
1109
1110	if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128_FULL) ||
1111	    cpacf_test_func(&km_functions, CPACF_KM_XTS_256_FULL)) {
1112		ret = aes_s390_register_skcipher(&fullxts_aes_alg);
1113		if (ret)
1114			goto out_err;
1115	}
1116
1117	if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
1118	    cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
1119		ret = aes_s390_register_skcipher(&xts_aes_alg);
1120		if (ret)
1121			goto out_err;
1122	}
1123
1124	if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
1125	    cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
1126	    cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
1127		ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
1128		if (!ctrblk) {
1129			ret = -ENOMEM;
1130			goto out_err;
1131		}
1132		ret = aes_s390_register_skcipher(&ctr_aes_alg);
1133		if (ret)
1134			goto out_err;
1135	}
1136
1137	if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
1138	    cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
1139	    cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
1140		ret = crypto_register_aead(&gcm_aes_aead);
1141		if (ret)
1142			goto out_err;
1143		aes_s390_aead_alg = &gcm_aes_aead;
1144	}
1145
1146	return 0;
1147out_err:
1148	aes_s390_fini();
1149	return ret;
1150}
1151
1152module_cpu_feature_match(S390_CPU_FEATURE_MSA, aes_s390_init);
1153module_exit(aes_s390_fini);
1154
1155MODULE_ALIAS_CRYPTO("aes-all");
1156
1157MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
1158MODULE_LICENSE("GPL");
1159MODULE_IMPORT_NS("CRYPTO_INTERNAL");