Commit | Line | Data |
---|---|---|
bf754ae8 JG |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * s390 implementation of the AES Cipher Algorithm. | |
5 | * | |
6 | * s390 Version: | |
a53c8fab | 7 | * Copyright IBM Corp. 2005, 2007 |
bf754ae8 | 8 | * Author(s): Jan Glauber (jang@de.ibm.com) |
b0c3e75d | 9 | * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback |
bf754ae8 | 10 | * |
f8246af0 | 11 | * Derived from "crypto/aes_generic.c" |
bf754ae8 JG |
12 | * |
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) | |
16 | * any later version. | |
17 | * | |
18 | */ | |
19 | ||
39f09392 JG |
20 | #define KMSG_COMPONENT "aes_s390" |
21 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
22 | ||
89e12654 | 23 | #include <crypto/aes.h> |
a9e62fad | 24 | #include <crypto/algapi.h> |
b0c3e75d | 25 | #include <linux/err.h> |
bf754ae8 JG |
26 | #include <linux/module.h> |
27 | #include <linux/init.h> | |
bf754ae8 JG |
28 | #include "crypt_s390.h" |
29 | ||
86aa9fc2 JG |
30 | #define AES_KEYLEN_128 1 |
31 | #define AES_KEYLEN_192 2 | |
32 | #define AES_KEYLEN_256 4 | |
33 | ||
0200f3ec GS |
34 | static u8 *ctrblk; |
35 | static char keylen_flag; | |
bf754ae8 JG |
36 | |
37 | struct s390_aes_ctx { | |
38 | u8 iv[AES_BLOCK_SIZE]; | |
39 | u8 key[AES_MAX_KEY_SIZE]; | |
a9e62fad HX |
40 | long enc; |
41 | long dec; | |
bf754ae8 | 42 | int key_len; |
b0c3e75d SS |
43 | union { |
44 | struct crypto_blkcipher *blk; | |
45 | struct crypto_cipher *cip; | |
46 | } fallback; | |
bf754ae8 JG |
47 | }; |
48 | ||
99d97222 GS |
49 | struct pcc_param { |
50 | u8 key[32]; | |
51 | u8 tweak[16]; | |
52 | u8 block[16]; | |
53 | u8 bit[16]; | |
54 | u8 xts[16]; | |
55 | }; | |
56 | ||
57 | struct s390_xts_ctx { | |
58 | u8 key[32]; | |
59 | u8 xts_param[16]; | |
60 | struct pcc_param pcc; | |
61 | long enc; | |
62 | long dec; | |
63 | int key_len; | |
64 | struct crypto_blkcipher *fallback; | |
65 | }; | |
66 | ||
b0c3e75d SS |
67 | /* |
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 | |
71 | */ | |
72 | static int need_fallback(unsigned int key_len) | |
bf754ae8 | 73 | { |
bf754ae8 JG |
74 | switch (key_len) { |
75 | case 16: | |
86aa9fc2 | 76 | if (!(keylen_flag & AES_KEYLEN_128)) |
b0c3e75d | 77 | return 1; |
bf754ae8 JG |
78 | break; |
79 | case 24: | |
86aa9fc2 | 80 | if (!(keylen_flag & AES_KEYLEN_192)) |
b0c3e75d | 81 | return 1; |
bf754ae8 JG |
82 | break; |
83 | case 32: | |
86aa9fc2 | 84 | if (!(keylen_flag & AES_KEYLEN_256)) |
b0c3e75d | 85 | return 1; |
bf754ae8 JG |
86 | break; |
87 | default: | |
b0c3e75d | 88 | return -1; |
bf754ae8 JG |
89 | break; |
90 | } | |
b0c3e75d SS |
91 | return 0; |
92 | } | |
93 | ||
94 | static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key, | |
95 | unsigned int key_len) | |
96 | { | |
97 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
98 | int ret; | |
99 | ||
d7ac7690 RK |
100 | sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; |
101 | sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags & | |
b0c3e75d SS |
102 | CRYPTO_TFM_REQ_MASK); |
103 | ||
104 | ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len); | |
105 | if (ret) { | |
106 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; | |
d7ac7690 | 107 | tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags & |
b0c3e75d SS |
108 | CRYPTO_TFM_RES_MASK); |
109 | } | |
110 | return ret; | |
111 | } | |
112 | ||
113 | static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
114 | unsigned int key_len) | |
115 | { | |
116 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
117 | u32 *flags = &tfm->crt_flags; | |
118 | int ret; | |
119 | ||
120 | ret = need_fallback(key_len); | |
121 | if (ret < 0) { | |
122 | *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
123 | return -EINVAL; | |
124 | } | |
bf754ae8 JG |
125 | |
126 | sctx->key_len = key_len; | |
b0c3e75d SS |
127 | if (!ret) { |
128 | memcpy(sctx->key, in_key, key_len); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | return setkey_fallback_cip(tfm, in_key, key_len); | |
bf754ae8 JG |
133 | } |
134 | ||
6c2bb98b | 135 | static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
bf754ae8 | 136 | { |
6c2bb98b | 137 | const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); |
bf754ae8 | 138 | |
b0c3e75d SS |
139 | if (unlikely(need_fallback(sctx->key_len))) { |
140 | crypto_cipher_encrypt_one(sctx->fallback.cip, out, in); | |
141 | return; | |
142 | } | |
143 | ||
bf754ae8 JG |
144 | switch (sctx->key_len) { |
145 | case 16: | |
146 | crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in, | |
147 | AES_BLOCK_SIZE); | |
148 | break; | |
149 | case 24: | |
150 | crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in, | |
151 | AES_BLOCK_SIZE); | |
152 | break; | |
153 | case 32: | |
154 | crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in, | |
155 | AES_BLOCK_SIZE); | |
156 | break; | |
157 | } | |
158 | } | |
159 | ||
6c2bb98b | 160 | static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) |
bf754ae8 | 161 | { |
6c2bb98b | 162 | const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); |
bf754ae8 | 163 | |
b0c3e75d SS |
164 | if (unlikely(need_fallback(sctx->key_len))) { |
165 | crypto_cipher_decrypt_one(sctx->fallback.cip, out, in); | |
166 | return; | |
167 | } | |
168 | ||
bf754ae8 JG |
169 | switch (sctx->key_len) { |
170 | case 16: | |
171 | crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in, | |
172 | AES_BLOCK_SIZE); | |
173 | break; | |
174 | case 24: | |
175 | crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in, | |
176 | AES_BLOCK_SIZE); | |
177 | break; | |
178 | case 32: | |
179 | crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in, | |
180 | AES_BLOCK_SIZE); | |
181 | break; | |
182 | } | |
183 | } | |
184 | ||
b0c3e75d SS |
185 | static int fallback_init_cip(struct crypto_tfm *tfm) |
186 | { | |
187 | const char *name = tfm->__crt_alg->cra_name; | |
188 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
189 | ||
190 | sctx->fallback.cip = crypto_alloc_cipher(name, 0, | |
191 | CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); | |
192 | ||
193 | if (IS_ERR(sctx->fallback.cip)) { | |
39f09392 JG |
194 | pr_err("Allocating AES fallback algorithm %s failed\n", |
195 | name); | |
b59cdcb3 | 196 | return PTR_ERR(sctx->fallback.cip); |
b0c3e75d SS |
197 | } |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static void fallback_exit_cip(struct crypto_tfm *tfm) | |
203 | { | |
204 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
205 | ||
206 | crypto_free_cipher(sctx->fallback.cip); | |
207 | sctx->fallback.cip = NULL; | |
208 | } | |
bf754ae8 JG |
209 | |
210 | static struct crypto_alg aes_alg = { | |
211 | .cra_name = "aes", | |
65b75c36 HX |
212 | .cra_driver_name = "aes-s390", |
213 | .cra_priority = CRYPT_S390_PRIORITY, | |
f67d1369 JG |
214 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER | |
215 | CRYPTO_ALG_NEED_FALLBACK, | |
bf754ae8 JG |
216 | .cra_blocksize = AES_BLOCK_SIZE, |
217 | .cra_ctxsize = sizeof(struct s390_aes_ctx), | |
218 | .cra_module = THIS_MODULE, | |
b0c3e75d SS |
219 | .cra_init = fallback_init_cip, |
220 | .cra_exit = fallback_exit_cip, | |
bf754ae8 JG |
221 | .cra_u = { |
222 | .cipher = { | |
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, | |
bf754ae8 JG |
228 | } |
229 | } | |
230 | }; | |
231 | ||
b0c3e75d SS |
232 | static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key, |
233 | unsigned int len) | |
234 | { | |
235 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
236 | unsigned int ret; | |
237 | ||
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); | |
241 | ||
242 | ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len); | |
243 | if (ret) { | |
244 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; | |
245 | tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags & | |
246 | CRYPTO_TFM_RES_MASK); | |
247 | } | |
248 | return ret; | |
249 | } | |
250 | ||
251 | static int fallback_blk_dec(struct blkcipher_desc *desc, | |
252 | struct scatterlist *dst, struct scatterlist *src, | |
253 | unsigned int nbytes) | |
254 | { | |
255 | unsigned int ret; | |
256 | struct crypto_blkcipher *tfm; | |
257 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
258 | ||
b0c3e75d SS |
259 | tfm = desc->tfm; |
260 | desc->tfm = sctx->fallback.blk; | |
261 | ||
2d74d405 | 262 | ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes); |
b0c3e75d SS |
263 | |
264 | desc->tfm = tfm; | |
265 | return ret; | |
266 | } | |
267 | ||
268 | static int fallback_blk_enc(struct blkcipher_desc *desc, | |
269 | struct scatterlist *dst, struct scatterlist *src, | |
270 | unsigned int nbytes) | |
271 | { | |
272 | unsigned int ret; | |
273 | struct crypto_blkcipher *tfm; | |
274 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
275 | ||
b0c3e75d SS |
276 | tfm = desc->tfm; |
277 | desc->tfm = sctx->fallback.blk; | |
278 | ||
2d74d405 | 279 | ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes); |
b0c3e75d SS |
280 | |
281 | desc->tfm = tfm; | |
282 | return ret; | |
283 | } | |
284 | ||
a9e62fad HX |
285 | static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, |
286 | unsigned int key_len) | |
287 | { | |
288 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
b0c3e75d SS |
289 | int ret; |
290 | ||
291 | ret = need_fallback(key_len); | |
292 | if (ret > 0) { | |
293 | sctx->key_len = key_len; | |
294 | return setkey_fallback_blk(tfm, in_key, key_len); | |
295 | } | |
a9e62fad HX |
296 | |
297 | switch (key_len) { | |
298 | case 16: | |
299 | sctx->enc = KM_AES_128_ENCRYPT; | |
300 | sctx->dec = KM_AES_128_DECRYPT; | |
301 | break; | |
302 | case 24: | |
303 | sctx->enc = KM_AES_192_ENCRYPT; | |
304 | sctx->dec = KM_AES_192_DECRYPT; | |
305 | break; | |
306 | case 32: | |
307 | sctx->enc = KM_AES_256_ENCRYPT; | |
308 | sctx->dec = KM_AES_256_DECRYPT; | |
309 | break; | |
310 | } | |
311 | ||
312 | return aes_set_key(tfm, in_key, key_len); | |
313 | } | |
314 | ||
315 | static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param, | |
316 | struct blkcipher_walk *walk) | |
317 | { | |
318 | int ret = blkcipher_walk_virt(desc, walk); | |
319 | unsigned int nbytes; | |
320 | ||
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; | |
326 | ||
327 | ret = crypt_s390_km(func, param, out, in, n); | |
36eb2caa JG |
328 | if (ret < 0 || ret != n) |
329 | return -EIO; | |
a9e62fad HX |
330 | |
331 | nbytes &= AES_BLOCK_SIZE - 1; | |
332 | ret = blkcipher_walk_done(desc, walk, nbytes); | |
333 | } | |
334 | ||
335 | return ret; | |
336 | } | |
337 | ||
338 | static int ecb_aes_encrypt(struct blkcipher_desc *desc, | |
339 | struct scatterlist *dst, struct scatterlist *src, | |
340 | unsigned int nbytes) | |
341 | { | |
342 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
343 | struct blkcipher_walk walk; | |
344 | ||
b0c3e75d SS |
345 | if (unlikely(need_fallback(sctx->key_len))) |
346 | return fallback_blk_enc(desc, dst, src, nbytes); | |
347 | ||
a9e62fad HX |
348 | blkcipher_walk_init(&walk, dst, src, nbytes); |
349 | return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk); | |
350 | } | |
351 | ||
352 | static int ecb_aes_decrypt(struct blkcipher_desc *desc, | |
353 | struct scatterlist *dst, struct scatterlist *src, | |
354 | unsigned int nbytes) | |
355 | { | |
356 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
357 | struct blkcipher_walk walk; | |
358 | ||
b0c3e75d SS |
359 | if (unlikely(need_fallback(sctx->key_len))) |
360 | return fallback_blk_dec(desc, dst, src, nbytes); | |
361 | ||
a9e62fad HX |
362 | blkcipher_walk_init(&walk, dst, src, nbytes); |
363 | return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk); | |
364 | } | |
365 | ||
b0c3e75d SS |
366 | static int fallback_init_blk(struct crypto_tfm *tfm) |
367 | { | |
368 | const char *name = tfm->__crt_alg->cra_name; | |
369 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
370 | ||
371 | sctx->fallback.blk = crypto_alloc_blkcipher(name, 0, | |
372 | CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); | |
373 | ||
374 | if (IS_ERR(sctx->fallback.blk)) { | |
39f09392 JG |
375 | pr_err("Allocating AES fallback algorithm %s failed\n", |
376 | name); | |
b0c3e75d SS |
377 | return PTR_ERR(sctx->fallback.blk); |
378 | } | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static void fallback_exit_blk(struct crypto_tfm *tfm) | |
384 | { | |
385 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
386 | ||
387 | crypto_free_blkcipher(sctx->fallback.blk); | |
388 | sctx->fallback.blk = NULL; | |
389 | } | |
390 | ||
a9e62fad HX |
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, | |
f67d1369 JG |
395 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | |
396 | CRYPTO_ALG_NEED_FALLBACK, | |
a9e62fad HX |
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, | |
b0c3e75d SS |
401 | .cra_init = fallback_init_blk, |
402 | .cra_exit = fallback_exit_blk, | |
a9e62fad HX |
403 | .cra_u = { |
404 | .blkcipher = { | |
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, | |
410 | } | |
411 | } | |
412 | }; | |
413 | ||
414 | static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
415 | unsigned int key_len) | |
416 | { | |
417 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
b0c3e75d SS |
418 | int ret; |
419 | ||
420 | ret = need_fallback(key_len); | |
421 | if (ret > 0) { | |
422 | sctx->key_len = key_len; | |
423 | return setkey_fallback_blk(tfm, in_key, key_len); | |
424 | } | |
a9e62fad HX |
425 | |
426 | switch (key_len) { | |
427 | case 16: | |
428 | sctx->enc = KMC_AES_128_ENCRYPT; | |
429 | sctx->dec = KMC_AES_128_DECRYPT; | |
430 | break; | |
431 | case 24: | |
432 | sctx->enc = KMC_AES_192_ENCRYPT; | |
433 | sctx->dec = KMC_AES_192_DECRYPT; | |
434 | break; | |
435 | case 32: | |
436 | sctx->enc = KMC_AES_256_ENCRYPT; | |
437 | sctx->dec = KMC_AES_256_DECRYPT; | |
438 | break; | |
439 | } | |
440 | ||
441 | return aes_set_key(tfm, in_key, key_len); | |
442 | } | |
443 | ||
444 | static int cbc_aes_crypt(struct blkcipher_desc *desc, long func, void *param, | |
445 | struct blkcipher_walk *walk) | |
446 | { | |
447 | int ret = blkcipher_walk_virt(desc, walk); | |
448 | unsigned int nbytes = walk->nbytes; | |
449 | ||
450 | if (!nbytes) | |
451 | goto out; | |
452 | ||
453 | memcpy(param, walk->iv, AES_BLOCK_SIZE); | |
454 | do { | |
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; | |
459 | ||
460 | ret = crypt_s390_kmc(func, param, out, in, n); | |
36eb2caa JG |
461 | if (ret < 0 || ret != n) |
462 | return -EIO; | |
a9e62fad HX |
463 | |
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); | |
468 | ||
469 | out: | |
470 | return ret; | |
471 | } | |
472 | ||
473 | static int cbc_aes_encrypt(struct blkcipher_desc *desc, | |
474 | struct scatterlist *dst, struct scatterlist *src, | |
475 | unsigned int nbytes) | |
476 | { | |
477 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
478 | struct blkcipher_walk walk; | |
479 | ||
b0c3e75d SS |
480 | if (unlikely(need_fallback(sctx->key_len))) |
481 | return fallback_blk_enc(desc, dst, src, nbytes); | |
482 | ||
a9e62fad HX |
483 | blkcipher_walk_init(&walk, dst, src, nbytes); |
484 | return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk); | |
485 | } | |
486 | ||
487 | static int cbc_aes_decrypt(struct blkcipher_desc *desc, | |
488 | struct scatterlist *dst, struct scatterlist *src, | |
489 | unsigned int nbytes) | |
490 | { | |
491 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
492 | struct blkcipher_walk walk; | |
493 | ||
b0c3e75d SS |
494 | if (unlikely(need_fallback(sctx->key_len))) |
495 | return fallback_blk_dec(desc, dst, src, nbytes); | |
496 | ||
a9e62fad HX |
497 | blkcipher_walk_init(&walk, dst, src, nbytes); |
498 | return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk); | |
499 | } | |
500 | ||
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, | |
f67d1369 JG |
505 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER | |
506 | CRYPTO_ALG_NEED_FALLBACK, | |
a9e62fad HX |
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, | |
b0c3e75d SS |
511 | .cra_init = fallback_init_blk, |
512 | .cra_exit = fallback_exit_blk, | |
a9e62fad HX |
513 | .cra_u = { |
514 | .blkcipher = { | |
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, | |
521 | } | |
522 | } | |
523 | }; | |
524 | ||
99d97222 GS |
525 | static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key, |
526 | unsigned int len) | |
527 | { | |
528 | struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); | |
529 | unsigned int ret; | |
530 | ||
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); | |
534 | ||
535 | ret = crypto_blkcipher_setkey(xts_ctx->fallback, key, len); | |
536 | if (ret) { | |
537 | tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; | |
538 | tfm->crt_flags |= (xts_ctx->fallback->base.crt_flags & | |
539 | CRYPTO_TFM_RES_MASK); | |
540 | } | |
541 | return ret; | |
542 | } | |
543 | ||
544 | static int xts_fallback_decrypt(struct blkcipher_desc *desc, | |
545 | struct scatterlist *dst, struct scatterlist *src, | |
546 | unsigned int nbytes) | |
547 | { | |
548 | struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm); | |
549 | struct crypto_blkcipher *tfm; | |
550 | unsigned int ret; | |
551 | ||
552 | tfm = desc->tfm; | |
553 | desc->tfm = xts_ctx->fallback; | |
554 | ||
555 | ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes); | |
556 | ||
557 | desc->tfm = tfm; | |
558 | return ret; | |
559 | } | |
560 | ||
561 | static int xts_fallback_encrypt(struct blkcipher_desc *desc, | |
562 | struct scatterlist *dst, struct scatterlist *src, | |
563 | unsigned int nbytes) | |
564 | { | |
565 | struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm); | |
566 | struct crypto_blkcipher *tfm; | |
567 | unsigned int ret; | |
568 | ||
569 | tfm = desc->tfm; | |
570 | desc->tfm = xts_ctx->fallback; | |
571 | ||
572 | ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes); | |
573 | ||
574 | desc->tfm = tfm; | |
575 | return ret; | |
576 | } | |
577 | ||
578 | static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
579 | unsigned int key_len) | |
580 | { | |
581 | struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); | |
582 | u32 *flags = &tfm->crt_flags; | |
583 | ||
584 | switch (key_len) { | |
585 | case 32: | |
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); | |
590 | break; | |
591 | case 48: | |
592 | xts_ctx->enc = 0; | |
593 | xts_ctx->dec = 0; | |
594 | xts_fallback_setkey(tfm, in_key, key_len); | |
595 | break; | |
596 | case 64: | |
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); | |
601 | break; | |
602 | default: | |
603 | *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
604 | return -EINVAL; | |
605 | } | |
606 | xts_ctx->key_len = key_len; | |
607 | return 0; | |
608 | } | |
609 | ||
610 | static int xts_aes_crypt(struct blkcipher_desc *desc, long func, | |
611 | struct s390_xts_ctx *xts_ctx, | |
612 | struct blkcipher_walk *walk) | |
613 | { | |
614 | unsigned int offset = (xts_ctx->key_len >> 1) & 0x10; | |
615 | int ret = blkcipher_walk_virt(desc, walk); | |
616 | unsigned int nbytes = walk->nbytes; | |
617 | unsigned int n; | |
618 | u8 *in, *out; | |
619 | void *param; | |
620 | ||
621 | if (!nbytes) | |
622 | goto out; | |
623 | ||
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); | |
36eb2caa JG |
630 | if (ret < 0) |
631 | return -EIO; | |
99d97222 GS |
632 | |
633 | memcpy(xts_ctx->xts_param, xts_ctx->pcc.xts, 16); | |
634 | param = xts_ctx->key + offset; | |
635 | do { | |
636 | /* only use complete blocks */ | |
637 | n = nbytes & ~(AES_BLOCK_SIZE - 1); | |
638 | out = walk->dst.virt.addr; | |
639 | in = walk->src.virt.addr; | |
640 | ||
641 | ret = crypt_s390_km(func, param, out, in, n); | |
36eb2caa JG |
642 | if (ret < 0 || ret != n) |
643 | return -EIO; | |
99d97222 GS |
644 | |
645 | nbytes &= AES_BLOCK_SIZE - 1; | |
646 | ret = blkcipher_walk_done(desc, walk, nbytes); | |
647 | } while ((nbytes = walk->nbytes)); | |
648 | out: | |
649 | return ret; | |
650 | } | |
651 | ||
652 | static int xts_aes_encrypt(struct blkcipher_desc *desc, | |
653 | struct scatterlist *dst, struct scatterlist *src, | |
654 | unsigned int nbytes) | |
655 | { | |
656 | struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm); | |
657 | struct blkcipher_walk walk; | |
658 | ||
659 | if (unlikely(xts_ctx->key_len == 48)) | |
660 | return xts_fallback_encrypt(desc, dst, src, nbytes); | |
661 | ||
662 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
663 | return xts_aes_crypt(desc, xts_ctx->enc, xts_ctx, &walk); | |
664 | } | |
665 | ||
666 | static int xts_aes_decrypt(struct blkcipher_desc *desc, | |
667 | struct scatterlist *dst, struct scatterlist *src, | |
668 | unsigned int nbytes) | |
669 | { | |
670 | struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm); | |
671 | struct blkcipher_walk walk; | |
672 | ||
673 | if (unlikely(xts_ctx->key_len == 48)) | |
674 | return xts_fallback_decrypt(desc, dst, src, nbytes); | |
675 | ||
676 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
677 | return xts_aes_crypt(desc, xts_ctx->dec, xts_ctx, &walk); | |
678 | } | |
679 | ||
680 | static int xts_fallback_init(struct crypto_tfm *tfm) | |
681 | { | |
682 | const char *name = tfm->__crt_alg->cra_name; | |
683 | struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); | |
684 | ||
685 | xts_ctx->fallback = crypto_alloc_blkcipher(name, 0, | |
686 | CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); | |
687 | ||
688 | if (IS_ERR(xts_ctx->fallback)) { | |
689 | pr_err("Allocating XTS fallback algorithm %s failed\n", | |
690 | name); | |
691 | return PTR_ERR(xts_ctx->fallback); | |
692 | } | |
693 | return 0; | |
694 | } | |
695 | ||
696 | static void xts_fallback_exit(struct crypto_tfm *tfm) | |
697 | { | |
698 | struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm); | |
699 | ||
700 | crypto_free_blkcipher(xts_ctx->fallback); | |
701 | xts_ctx->fallback = NULL; | |
702 | } | |
703 | ||
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, | |
99d97222 GS |
714 | .cra_init = xts_fallback_init, |
715 | .cra_exit = xts_fallback_exit, | |
716 | .cra_u = { | |
717 | .blkcipher = { | |
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, | |
724 | } | |
725 | } | |
726 | }; | |
727 | ||
4f57ba71 IT |
728 | static int xts_aes_alg_reg; |
729 | ||
0200f3ec GS |
730 | static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, |
731 | unsigned int key_len) | |
732 | { | |
733 | struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm); | |
734 | ||
735 | switch (key_len) { | |
736 | case 16: | |
737 | sctx->enc = KMCTR_AES_128_ENCRYPT; | |
738 | sctx->dec = KMCTR_AES_128_DECRYPT; | |
739 | break; | |
740 | case 24: | |
741 | sctx->enc = KMCTR_AES_192_ENCRYPT; | |
742 | sctx->dec = KMCTR_AES_192_DECRYPT; | |
743 | break; | |
744 | case 32: | |
745 | sctx->enc = KMCTR_AES_256_ENCRYPT; | |
746 | sctx->dec = KMCTR_AES_256_DECRYPT; | |
747 | break; | |
748 | } | |
749 | ||
750 | return aes_set_key(tfm, in_key, key_len); | |
751 | } | |
752 | ||
753 | static int ctr_aes_crypt(struct blkcipher_desc *desc, long func, | |
754 | struct s390_aes_ctx *sctx, struct blkcipher_walk *walk) | |
755 | { | |
756 | int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE); | |
757 | unsigned int i, n, nbytes; | |
758 | u8 buf[AES_BLOCK_SIZE]; | |
759 | u8 *out, *in; | |
760 | ||
761 | if (!walk->nbytes) | |
762 | return ret; | |
763 | ||
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, | |
774 | AES_BLOCK_SIZE); | |
775 | crypto_inc(ctrblk + i, AES_BLOCK_SIZE); | |
776 | } | |
777 | ret = crypt_s390_kmctr(func, sctx->key, out, in, n, ctrblk); | |
36eb2caa JG |
778 | if (ret < 0 || ret != n) |
779 | return -EIO; | |
0200f3ec GS |
780 | if (n > AES_BLOCK_SIZE) |
781 | memcpy(ctrblk, ctrblk + n - AES_BLOCK_SIZE, | |
782 | AES_BLOCK_SIZE); | |
783 | crypto_inc(ctrblk, AES_BLOCK_SIZE); | |
784 | out += n; | |
785 | in += n; | |
786 | nbytes -= n; | |
787 | } | |
788 | ret = blkcipher_walk_done(desc, walk, nbytes); | |
789 | } | |
790 | /* | |
791 | * final block may be < AES_BLOCK_SIZE, copy only nbytes | |
792 | */ | |
793 | if (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); | |
36eb2caa JG |
798 | if (ret < 0 || ret != AES_BLOCK_SIZE) |
799 | return -EIO; | |
0200f3ec GS |
800 | memcpy(out, buf, nbytes); |
801 | crypto_inc(ctrblk, AES_BLOCK_SIZE); | |
802 | ret = blkcipher_walk_done(desc, walk, 0); | |
803 | } | |
804 | memcpy(walk->iv, ctrblk, AES_BLOCK_SIZE); | |
805 | return ret; | |
806 | } | |
807 | ||
808 | static int ctr_aes_encrypt(struct blkcipher_desc *desc, | |
809 | struct scatterlist *dst, struct scatterlist *src, | |
810 | unsigned int nbytes) | |
811 | { | |
812 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
813 | struct blkcipher_walk walk; | |
814 | ||
815 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
816 | return ctr_aes_crypt(desc, sctx->enc, sctx, &walk); | |
817 | } | |
818 | ||
819 | static int ctr_aes_decrypt(struct blkcipher_desc *desc, | |
820 | struct scatterlist *dst, struct scatterlist *src, | |
821 | unsigned int nbytes) | |
822 | { | |
823 | struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm); | |
824 | struct blkcipher_walk walk; | |
825 | ||
826 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
827 | return ctr_aes_crypt(desc, sctx->dec, sctx, &walk); | |
828 | } | |
829 | ||
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, | |
835 | .cra_blocksize = 1, | |
836 | .cra_ctxsize = sizeof(struct s390_aes_ctx), | |
837 | .cra_type = &crypto_blkcipher_type, | |
838 | .cra_module = THIS_MODULE, | |
0200f3ec GS |
839 | .cra_u = { |
840 | .blkcipher = { | |
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, | |
847 | } | |
848 | } | |
849 | }; | |
850 | ||
4f57ba71 IT |
851 | static int ctr_aes_alg_reg; |
852 | ||
9f7819c1 | 853 | static int __init aes_s390_init(void) |
bf754ae8 JG |
854 | { |
855 | int ret; | |
856 | ||
1822bc90 | 857 | if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA)) |
86aa9fc2 | 858 | keylen_flag |= AES_KEYLEN_128; |
1822bc90 | 859 | if (crypt_s390_func_available(KM_AES_192_ENCRYPT, CRYPT_S390_MSA)) |
86aa9fc2 | 860 | keylen_flag |= AES_KEYLEN_192; |
1822bc90 | 861 | if (crypt_s390_func_available(KM_AES_256_ENCRYPT, CRYPT_S390_MSA)) |
86aa9fc2 JG |
862 | keylen_flag |= AES_KEYLEN_256; |
863 | ||
864 | if (!keylen_flag) | |
865 | return -EOPNOTSUPP; | |
bf754ae8 | 866 | |
86aa9fc2 | 867 | /* z9 109 and z9 BC/EC only support 128 bit key length */ |
b0c3e75d | 868 | if (keylen_flag == AES_KEYLEN_128) |
39f09392 JG |
869 | pr_info("AES hardware acceleration is only available for" |
870 | " 128-bit keys\n"); | |
bf754ae8 JG |
871 | |
872 | ret = crypto_register_alg(&aes_alg); | |
86aa9fc2 | 873 | if (ret) |
a9e62fad | 874 | goto aes_err; |
a9e62fad HX |
875 | |
876 | ret = crypto_register_alg(&ecb_aes_alg); | |
86aa9fc2 | 877 | if (ret) |
a9e62fad | 878 | goto ecb_aes_err; |
a9e62fad HX |
879 | |
880 | ret = crypto_register_alg(&cbc_aes_alg); | |
86aa9fc2 | 881 | if (ret) |
a9e62fad | 882 | goto cbc_aes_err; |
a9e62fad | 883 | |
99d97222 GS |
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); | |
889 | if (ret) | |
890 | goto xts_aes_err; | |
4f57ba71 | 891 | xts_aes_alg_reg = 1; |
99d97222 GS |
892 | } |
893 | ||
0200f3ec GS |
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); | |
901 | if (!ctrblk) { | |
902 | ret = -ENOMEM; | |
903 | goto ctr_aes_err; | |
904 | } | |
905 | ret = crypto_register_alg(&ctr_aes_alg); | |
906 | if (ret) { | |
907 | free_page((unsigned long) ctrblk); | |
908 | goto ctr_aes_err; | |
909 | } | |
4f57ba71 | 910 | ctr_aes_alg_reg = 1; |
0200f3ec GS |
911 | } |
912 | ||
a9e62fad | 913 | out: |
bf754ae8 | 914 | return ret; |
a9e62fad | 915 | |
0200f3ec GS |
916 | ctr_aes_err: |
917 | crypto_unregister_alg(&xts_aes_alg); | |
99d97222 GS |
918 | xts_aes_err: |
919 | crypto_unregister_alg(&cbc_aes_alg); | |
a9e62fad HX |
920 | cbc_aes_err: |
921 | crypto_unregister_alg(&ecb_aes_alg); | |
922 | ecb_aes_err: | |
923 | crypto_unregister_alg(&aes_alg); | |
924 | aes_err: | |
925 | goto out; | |
bf754ae8 JG |
926 | } |
927 | ||
9f7819c1 | 928 | static void __exit aes_s390_fini(void) |
bf754ae8 | 929 | { |
4f57ba71 IT |
930 | if (ctr_aes_alg_reg) { |
931 | crypto_unregister_alg(&ctr_aes_alg); | |
932 | free_page((unsigned long) ctrblk); | |
933 | } | |
934 | if (xts_aes_alg_reg) | |
935 | crypto_unregister_alg(&xts_aes_alg); | |
a9e62fad HX |
936 | crypto_unregister_alg(&cbc_aes_alg); |
937 | crypto_unregister_alg(&ecb_aes_alg); | |
bf754ae8 JG |
938 | crypto_unregister_alg(&aes_alg); |
939 | } | |
940 | ||
9f7819c1 HC |
941 | module_init(aes_s390_init); |
942 | module_exit(aes_s390_fini); | |
bf754ae8 | 943 | |
a760a665 | 944 | MODULE_ALIAS("aes-all"); |
bf754ae8 JG |
945 | |
946 | MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm"); | |
947 | MODULE_LICENSE("GPL"); |