4 * s390 implementation of the AES Cipher Algorithm.
7 * Copyright IBM Corp. 2005, 2007
8 * Author(s): Jan Glauber (jang@de.ibm.com)
9 * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
11 * Derived from "crypto/aes_generic.c"
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
20 #define KMSG_COMPONENT "aes_s390"
21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23 #include <crypto/aes.h>
24 #include <crypto/algapi.h>
25 #include <linux/err.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include "crypt_s390.h"
30 #define AES_KEYLEN_128 1
31 #define AES_KEYLEN_192 2
32 #define AES_KEYLEN_256 4
35 static char keylen_flag;
38 u8 iv[AES_BLOCK_SIZE];
39 u8 key[AES_MAX_KEY_SIZE];
44 struct crypto_blkcipher *blk;
45 struct crypto_cipher *cip;
64 struct crypto_blkcipher *fallback;
68 * Check if the key_len is supported by the HW.
69 * Returns 0 if it is, a positive number if it is not and software fallback is
70 * required or a negative number in case the key size is not valid
72 static int need_fallback(unsigned int key_len)
76 if (!(keylen_flag & AES_KEYLEN_128))
80 if (!(keylen_flag & AES_KEYLEN_192))
84 if (!(keylen_flag & AES_KEYLEN_256))
94 static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
97 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
100 sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
101 sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
102 CRYPTO_TFM_REQ_MASK);
104 ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
106 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
107 tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
108 CRYPTO_TFM_RES_MASK);
113 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
114 unsigned int key_len)
116 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
117 u32 *flags = &tfm->crt_flags;
120 ret = need_fallback(key_len);
122 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
126 sctx->key_len = key_len;
128 memcpy(sctx->key, in_key, key_len);
132 return setkey_fallback_cip(tfm, in_key, key_len);
135 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
137 const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
139 if (unlikely(need_fallback(sctx->key_len))) {
140 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
144 switch (sctx->key_len) {
146 crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in,
150 crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in,
154 crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in,
160 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
162 const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
164 if (unlikely(need_fallback(sctx->key_len))) {
165 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
169 switch (sctx->key_len) {
171 crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in,
175 crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in,
179 crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in,
185 static int fallback_init_cip(struct crypto_tfm *tfm)
187 const char *name = tfm->__crt_alg->cra_name;
188 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
190 sctx->fallback.cip = crypto_alloc_cipher(name, 0,
191 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
193 if (IS_ERR(sctx->fallback.cip)) {
194 pr_err("Allocating AES fallback algorithm %s failed\n",
196 return PTR_ERR(sctx->fallback.cip);
202 static void fallback_exit_cip(struct crypto_tfm *tfm)
204 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
206 crypto_free_cipher(sctx->fallback.cip);
207 sctx->fallback.cip = NULL;
210 static struct crypto_alg aes_alg = {
212 .cra_driver_name = "aes-s390",
213 .cra_priority = CRYPT_S390_PRIORITY,
214 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
215 CRYPTO_ALG_NEED_FALLBACK,
216 .cra_blocksize = AES_BLOCK_SIZE,
217 .cra_ctxsize = sizeof(struct s390_aes_ctx),
218 .cra_module = THIS_MODULE,
219 .cra_init = fallback_init_cip,
220 .cra_exit = fallback_exit_cip,
223 .cia_min_keysize = AES_MIN_KEY_SIZE,
224 .cia_max_keysize = AES_MAX_KEY_SIZE,
225 .cia_setkey = aes_set_key,
226 .cia_encrypt = aes_encrypt,
227 .cia_decrypt = aes_decrypt,
232 static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
235 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
238 sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
239 sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
240 CRYPTO_TFM_REQ_MASK);
242 ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len);
244 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
245 tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
246 CRYPTO_TFM_RES_MASK);
251 static int fallback_blk_dec(struct blkcipher_desc *desc,
252 struct scatterlist *dst, struct scatterlist *src,
256 struct crypto_blkcipher *tfm;
257 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
260 desc->tfm = sctx->fallback.blk;
262 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
268 static int fallback_blk_enc(struct blkcipher_desc *desc,
269 struct scatterlist *dst, struct scatterlist *src,
273 struct crypto_blkcipher *tfm;
274 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
277 desc->tfm = sctx->fallback.blk;
279 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
285 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
286 unsigned int key_len)
288 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
291 ret = need_fallback(key_len);
293 sctx->key_len = key_len;
294 return setkey_fallback_blk(tfm, in_key, key_len);
299 sctx->enc = KM_AES_128_ENCRYPT;
300 sctx->dec = KM_AES_128_DECRYPT;
303 sctx->enc = KM_AES_192_ENCRYPT;
304 sctx->dec = KM_AES_192_DECRYPT;
307 sctx->enc = KM_AES_256_ENCRYPT;
308 sctx->dec = KM_AES_256_DECRYPT;
312 return aes_set_key(tfm, in_key, key_len);
315 static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
316 struct blkcipher_walk *walk)
318 int ret = blkcipher_walk_virt(desc, walk);
321 while ((nbytes = walk->nbytes)) {
322 /* only use complete blocks */
323 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
324 u8 *out = walk->dst.virt.addr;
325 u8 *in = walk->src.virt.addr;
327 ret = crypt_s390_km(func, param, out, in, n);
328 if (ret < 0 || ret != n)
331 nbytes &= AES_BLOCK_SIZE - 1;
332 ret = blkcipher_walk_done(desc, walk, nbytes);
338 static int ecb_aes_encrypt(struct blkcipher_desc *desc,
339 struct scatterlist *dst, struct scatterlist *src,
342 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
343 struct blkcipher_walk walk;
345 if (unlikely(need_fallback(sctx->key_len)))
346 return fallback_blk_enc(desc, dst, src, nbytes);
348 blkcipher_walk_init(&walk, dst, src, nbytes);
349 return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk);
352 static int ecb_aes_decrypt(struct blkcipher_desc *desc,
353 struct scatterlist *dst, struct scatterlist *src,
356 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
357 struct blkcipher_walk walk;
359 if (unlikely(need_fallback(sctx->key_len)))
360 return fallback_blk_dec(desc, dst, src, nbytes);
362 blkcipher_walk_init(&walk, dst, src, nbytes);
363 return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk);
366 static int fallback_init_blk(struct crypto_tfm *tfm)
368 const char *name = tfm->__crt_alg->cra_name;
369 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
371 sctx->fallback.blk = crypto_alloc_blkcipher(name, 0,
372 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
374 if (IS_ERR(sctx->fallback.blk)) {
375 pr_err("Allocating AES fallback algorithm %s failed\n",
377 return PTR_ERR(sctx->fallback.blk);
383 static void fallback_exit_blk(struct crypto_tfm *tfm)
385 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
387 crypto_free_blkcipher(sctx->fallback.blk);
388 sctx->fallback.blk = NULL;
391 static struct crypto_alg ecb_aes_alg = {
392 .cra_name = "ecb(aes)",
393 .cra_driver_name = "ecb-aes-s390",
394 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
395 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
396 CRYPTO_ALG_NEED_FALLBACK,
397 .cra_blocksize = AES_BLOCK_SIZE,
398 .cra_ctxsize = sizeof(struct s390_aes_ctx),
399 .cra_type = &crypto_blkcipher_type,
400 .cra_module = THIS_MODULE,
401 .cra_init = fallback_init_blk,
402 .cra_exit = fallback_exit_blk,
405 .min_keysize = AES_MIN_KEY_SIZE,
406 .max_keysize = AES_MAX_KEY_SIZE,
407 .setkey = ecb_aes_set_key,
408 .encrypt = ecb_aes_encrypt,
409 .decrypt = ecb_aes_decrypt,
414 static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
415 unsigned int key_len)
417 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
420 ret = need_fallback(key_len);
422 sctx->key_len = key_len;
423 return setkey_fallback_blk(tfm, in_key, key_len);
428 sctx->enc = KMC_AES_128_ENCRYPT;
429 sctx->dec = KMC_AES_128_DECRYPT;
432 sctx->enc = KMC_AES_192_ENCRYPT;
433 sctx->dec = KMC_AES_192_DECRYPT;
436 sctx->enc = KMC_AES_256_ENCRYPT;
437 sctx->dec = KMC_AES_256_DECRYPT;
441 return aes_set_key(tfm, in_key, key_len);
444 static int cbc_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
445 struct blkcipher_walk *walk)
447 int ret = blkcipher_walk_virt(desc, walk);
448 unsigned int nbytes = walk->nbytes;
453 memcpy(param, walk->iv, AES_BLOCK_SIZE);
455 /* only use complete blocks */
456 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
457 u8 *out = walk->dst.virt.addr;
458 u8 *in = walk->src.virt.addr;
460 ret = crypt_s390_kmc(func, param, out, in, n);
461 if (ret < 0 || ret != n)
464 nbytes &= AES_BLOCK_SIZE - 1;
465 ret = blkcipher_walk_done(desc, walk, nbytes);
466 } while ((nbytes = walk->nbytes));
467 memcpy(walk->iv, param, AES_BLOCK_SIZE);
473 static int cbc_aes_encrypt(struct blkcipher_desc *desc,
474 struct scatterlist *dst, struct scatterlist *src,
477 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
478 struct blkcipher_walk walk;
480 if (unlikely(need_fallback(sctx->key_len)))
481 return fallback_blk_enc(desc, dst, src, nbytes);
483 blkcipher_walk_init(&walk, dst, src, nbytes);
484 return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk);
487 static int cbc_aes_decrypt(struct blkcipher_desc *desc,
488 struct scatterlist *dst, struct scatterlist *src,
491 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
492 struct blkcipher_walk walk;
494 if (unlikely(need_fallback(sctx->key_len)))
495 return fallback_blk_dec(desc, dst, src, nbytes);
497 blkcipher_walk_init(&walk, dst, src, nbytes);
498 return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk);
501 static struct crypto_alg cbc_aes_alg = {
502 .cra_name = "cbc(aes)",
503 .cra_driver_name = "cbc-aes-s390",
504 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
505 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
506 CRYPTO_ALG_NEED_FALLBACK,
507 .cra_blocksize = AES_BLOCK_SIZE,
508 .cra_ctxsize = sizeof(struct s390_aes_ctx),
509 .cra_type = &crypto_blkcipher_type,
510 .cra_module = THIS_MODULE,
511 .cra_init = fallback_init_blk,
512 .cra_exit = fallback_exit_blk,
515 .min_keysize = AES_MIN_KEY_SIZE,
516 .max_keysize = AES_MAX_KEY_SIZE,
517 .ivsize = AES_BLOCK_SIZE,
518 .setkey = cbc_aes_set_key,
519 .encrypt = cbc_aes_encrypt,
520 .decrypt = cbc_aes_decrypt,
525 static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
528 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
531 xts_ctx->fallback->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
532 xts_ctx->fallback->base.crt_flags |= (tfm->crt_flags &
533 CRYPTO_TFM_REQ_MASK);
535 ret = crypto_blkcipher_setkey(xts_ctx->fallback, key, len);
537 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
538 tfm->crt_flags |= (xts_ctx->fallback->base.crt_flags &
539 CRYPTO_TFM_RES_MASK);
544 static int xts_fallback_decrypt(struct blkcipher_desc *desc,
545 struct scatterlist *dst, struct scatterlist *src,
548 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
549 struct crypto_blkcipher *tfm;
553 desc->tfm = xts_ctx->fallback;
555 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
561 static int xts_fallback_encrypt(struct blkcipher_desc *desc,
562 struct scatterlist *dst, struct scatterlist *src,
565 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
566 struct crypto_blkcipher *tfm;
570 desc->tfm = xts_ctx->fallback;
572 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
578 static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
579 unsigned int key_len)
581 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
582 u32 *flags = &tfm->crt_flags;
586 xts_ctx->enc = KM_XTS_128_ENCRYPT;
587 xts_ctx->dec = KM_XTS_128_DECRYPT;
588 memcpy(xts_ctx->key + 16, in_key, 16);
589 memcpy(xts_ctx->pcc.key + 16, in_key + 16, 16);
594 xts_fallback_setkey(tfm, in_key, key_len);
597 xts_ctx->enc = KM_XTS_256_ENCRYPT;
598 xts_ctx->dec = KM_XTS_256_DECRYPT;
599 memcpy(xts_ctx->key, in_key, 32);
600 memcpy(xts_ctx->pcc.key, in_key + 32, 32);
603 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
606 xts_ctx->key_len = key_len;
610 static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
611 struct s390_xts_ctx *xts_ctx,
612 struct blkcipher_walk *walk)
614 unsigned int offset = (xts_ctx->key_len >> 1) & 0x10;
615 int ret = blkcipher_walk_virt(desc, walk);
616 unsigned int nbytes = walk->nbytes;
624 memset(xts_ctx->pcc.block, 0, sizeof(xts_ctx->pcc.block));
625 memset(xts_ctx->pcc.bit, 0, sizeof(xts_ctx->pcc.bit));
626 memset(xts_ctx->pcc.xts, 0, sizeof(xts_ctx->pcc.xts));
627 memcpy(xts_ctx->pcc.tweak, walk->iv, sizeof(xts_ctx->pcc.tweak));
628 param = xts_ctx->pcc.key + offset;
629 ret = crypt_s390_pcc(func, param);
633 memcpy(xts_ctx->xts_param, xts_ctx->pcc.xts, 16);
634 param = xts_ctx->key + offset;
636 /* only use complete blocks */
637 n = nbytes & ~(AES_BLOCK_SIZE - 1);
638 out = walk->dst.virt.addr;
639 in = walk->src.virt.addr;
641 ret = crypt_s390_km(func, param, out, in, n);
642 if (ret < 0 || ret != n)
645 nbytes &= AES_BLOCK_SIZE - 1;
646 ret = blkcipher_walk_done(desc, walk, nbytes);
647 } while ((nbytes = walk->nbytes));
652 static int xts_aes_encrypt(struct blkcipher_desc *desc,
653 struct scatterlist *dst, struct scatterlist *src,
656 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
657 struct blkcipher_walk walk;
659 if (unlikely(xts_ctx->key_len == 48))
660 return xts_fallback_encrypt(desc, dst, src, nbytes);
662 blkcipher_walk_init(&walk, dst, src, nbytes);
663 return xts_aes_crypt(desc, xts_ctx->enc, xts_ctx, &walk);
666 static int xts_aes_decrypt(struct blkcipher_desc *desc,
667 struct scatterlist *dst, struct scatterlist *src,
670 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
671 struct blkcipher_walk walk;
673 if (unlikely(xts_ctx->key_len == 48))
674 return xts_fallback_decrypt(desc, dst, src, nbytes);
676 blkcipher_walk_init(&walk, dst, src, nbytes);
677 return xts_aes_crypt(desc, xts_ctx->dec, xts_ctx, &walk);
680 static int xts_fallback_init(struct crypto_tfm *tfm)
682 const char *name = tfm->__crt_alg->cra_name;
683 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
685 xts_ctx->fallback = crypto_alloc_blkcipher(name, 0,
686 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
688 if (IS_ERR(xts_ctx->fallback)) {
689 pr_err("Allocating XTS fallback algorithm %s failed\n",
691 return PTR_ERR(xts_ctx->fallback);
696 static void xts_fallback_exit(struct crypto_tfm *tfm)
698 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
700 crypto_free_blkcipher(xts_ctx->fallback);
701 xts_ctx->fallback = NULL;
704 static struct crypto_alg xts_aes_alg = {
705 .cra_name = "xts(aes)",
706 .cra_driver_name = "xts-aes-s390",
707 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
708 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
709 CRYPTO_ALG_NEED_FALLBACK,
710 .cra_blocksize = AES_BLOCK_SIZE,
711 .cra_ctxsize = sizeof(struct s390_xts_ctx),
712 .cra_type = &crypto_blkcipher_type,
713 .cra_module = THIS_MODULE,
714 .cra_init = xts_fallback_init,
715 .cra_exit = xts_fallback_exit,
718 .min_keysize = 2 * AES_MIN_KEY_SIZE,
719 .max_keysize = 2 * AES_MAX_KEY_SIZE,
720 .ivsize = AES_BLOCK_SIZE,
721 .setkey = xts_aes_set_key,
722 .encrypt = xts_aes_encrypt,
723 .decrypt = xts_aes_decrypt,
728 static int xts_aes_alg_reg;
730 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
731 unsigned int key_len)
733 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
737 sctx->enc = KMCTR_AES_128_ENCRYPT;
738 sctx->dec = KMCTR_AES_128_DECRYPT;
741 sctx->enc = KMCTR_AES_192_ENCRYPT;
742 sctx->dec = KMCTR_AES_192_DECRYPT;
745 sctx->enc = KMCTR_AES_256_ENCRYPT;
746 sctx->dec = KMCTR_AES_256_DECRYPT;
750 return aes_set_key(tfm, in_key, key_len);
753 static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
754 struct s390_aes_ctx *sctx, struct blkcipher_walk *walk)
756 int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
757 unsigned int i, n, nbytes;
758 u8 buf[AES_BLOCK_SIZE];
764 memcpy(ctrblk, walk->iv, AES_BLOCK_SIZE);
765 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
766 out = walk->dst.virt.addr;
767 in = walk->src.virt.addr;
768 while (nbytes >= AES_BLOCK_SIZE) {
769 /* only use complete blocks, max. PAGE_SIZE */
770 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :
771 nbytes & ~(AES_BLOCK_SIZE - 1);
772 for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {
773 memcpy(ctrblk + i, ctrblk + i - AES_BLOCK_SIZE,
775 crypto_inc(ctrblk + i, AES_BLOCK_SIZE);
777 ret = crypt_s390_kmctr(func, sctx->key, out, in, n, ctrblk);
778 if (ret < 0 || ret != n)
780 if (n > AES_BLOCK_SIZE)
781 memcpy(ctrblk, ctrblk + n - AES_BLOCK_SIZE,
783 crypto_inc(ctrblk, AES_BLOCK_SIZE);
788 ret = blkcipher_walk_done(desc, walk, nbytes);
791 * final block may be < AES_BLOCK_SIZE, copy only nbytes
794 out = walk->dst.virt.addr;
795 in = walk->src.virt.addr;
796 ret = crypt_s390_kmctr(func, sctx->key, buf, in,
797 AES_BLOCK_SIZE, ctrblk);
798 if (ret < 0 || ret != AES_BLOCK_SIZE)
800 memcpy(out, buf, nbytes);
801 crypto_inc(ctrblk, AES_BLOCK_SIZE);
802 ret = blkcipher_walk_done(desc, walk, 0);
804 memcpy(walk->iv, ctrblk, AES_BLOCK_SIZE);
808 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
809 struct scatterlist *dst, struct scatterlist *src,
812 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
813 struct blkcipher_walk walk;
815 blkcipher_walk_init(&walk, dst, src, nbytes);
816 return ctr_aes_crypt(desc, sctx->enc, sctx, &walk);
819 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
820 struct scatterlist *dst, struct scatterlist *src,
823 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
824 struct blkcipher_walk walk;
826 blkcipher_walk_init(&walk, dst, src, nbytes);
827 return ctr_aes_crypt(desc, sctx->dec, sctx, &walk);
830 static struct crypto_alg ctr_aes_alg = {
831 .cra_name = "ctr(aes)",
832 .cra_driver_name = "ctr-aes-s390",
833 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
834 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
836 .cra_ctxsize = sizeof(struct s390_aes_ctx),
837 .cra_type = &crypto_blkcipher_type,
838 .cra_module = THIS_MODULE,
841 .min_keysize = AES_MIN_KEY_SIZE,
842 .max_keysize = AES_MAX_KEY_SIZE,
843 .ivsize = AES_BLOCK_SIZE,
844 .setkey = ctr_aes_set_key,
845 .encrypt = ctr_aes_encrypt,
846 .decrypt = ctr_aes_decrypt,
851 static int ctr_aes_alg_reg;
853 static int __init aes_s390_init(void)
857 if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA))
858 keylen_flag |= AES_KEYLEN_128;
859 if (crypt_s390_func_available(KM_AES_192_ENCRYPT, CRYPT_S390_MSA))
860 keylen_flag |= AES_KEYLEN_192;
861 if (crypt_s390_func_available(KM_AES_256_ENCRYPT, CRYPT_S390_MSA))
862 keylen_flag |= AES_KEYLEN_256;
867 /* z9 109 and z9 BC/EC only support 128 bit key length */
868 if (keylen_flag == AES_KEYLEN_128)
869 pr_info("AES hardware acceleration is only available for"
872 ret = crypto_register_alg(&aes_alg);
876 ret = crypto_register_alg(&ecb_aes_alg);
880 ret = crypto_register_alg(&cbc_aes_alg);
884 if (crypt_s390_func_available(KM_XTS_128_ENCRYPT,
885 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
886 crypt_s390_func_available(KM_XTS_256_ENCRYPT,
887 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
888 ret = crypto_register_alg(&xts_aes_alg);
894 if (crypt_s390_func_available(KMCTR_AES_128_ENCRYPT,
895 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
896 crypt_s390_func_available(KMCTR_AES_192_ENCRYPT,
897 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
898 crypt_s390_func_available(KMCTR_AES_256_ENCRYPT,
899 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
900 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
905 ret = crypto_register_alg(&ctr_aes_alg);
907 free_page((unsigned long) ctrblk);
917 crypto_unregister_alg(&xts_aes_alg);
919 crypto_unregister_alg(&cbc_aes_alg);
921 crypto_unregister_alg(&ecb_aes_alg);
923 crypto_unregister_alg(&aes_alg);
928 static void __exit aes_s390_fini(void)
930 if (ctr_aes_alg_reg) {
931 crypto_unregister_alg(&ctr_aes_alg);
932 free_page((unsigned long) ctrblk);
935 crypto_unregister_alg(&xts_aes_alg);
936 crypto_unregister_alg(&cbc_aes_alg);
937 crypto_unregister_alg(&ecb_aes_alg);
938 crypto_unregister_alg(&aes_alg);
941 module_init(aes_s390_init);
942 module_exit(aes_s390_fini);
944 MODULE_ALIAS("aes-all");
946 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
947 MODULE_LICENSE("GPL");