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20a884f5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
27937843 MS |
2 | /* |
3 | * Cryptographic API. | |
4 | * | |
5 | * s390 implementation of the AES Cipher Algorithm with protected keys. | |
6 | * | |
7 | * s390 Version: | |
8 | * Copyright IBM Corp. 2017 | |
9 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
10 | * Harald Freudenberger <freude@de.ibm.com> | |
27937843 MS |
11 | */ |
12 | ||
13 | #define KMSG_COMPONENT "paes_s390" | |
14 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
15 | ||
16 | #include <crypto/aes.h> | |
17 | #include <crypto/algapi.h> | |
18 | #include <linux/bug.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/cpufeature.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <crypto/xts.h> | |
25 | #include <asm/cpacf.h> | |
26 | #include <asm/pkey.h> | |
27 | ||
28 | static u8 *ctrblk; | |
29 | static DEFINE_SPINLOCK(ctrblk_lock); | |
30 | ||
31 | static cpacf_mask_t km_functions, kmc_functions, kmctr_functions; | |
32 | ||
33 | struct s390_paes_ctx { | |
34 | struct pkey_seckey sk; | |
35 | struct pkey_protkey pk; | |
36 | unsigned long fc; | |
37 | }; | |
38 | ||
39 | struct s390_pxts_ctx { | |
40 | struct pkey_seckey sk[2]; | |
41 | struct pkey_protkey pk[2]; | |
42 | unsigned long fc; | |
43 | }; | |
44 | ||
45 | static inline int __paes_convert_key(struct pkey_seckey *sk, | |
46 | struct pkey_protkey *pk) | |
47 | { | |
48 | int i, ret; | |
49 | ||
50 | /* try three times in case of failure */ | |
51 | for (i = 0; i < 3; i++) { | |
52 | ret = pkey_skey2pkey(sk, pk); | |
53 | if (ret == 0) | |
54 | break; | |
55 | } | |
56 | ||
57 | return ret; | |
58 | } | |
59 | ||
60 | static int __paes_set_key(struct s390_paes_ctx *ctx) | |
61 | { | |
62 | unsigned long fc; | |
63 | ||
64 | if (__paes_convert_key(&ctx->sk, &ctx->pk)) | |
65 | return -EINVAL; | |
66 | ||
67 | /* Pick the correct function code based on the protected key type */ | |
68 | fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 : | |
69 | (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 : | |
70 | (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0; | |
71 | ||
72 | /* Check if the function code is available */ | |
73 | ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0; | |
74 | ||
75 | return ctx->fc ? 0 : -EINVAL; | |
76 | } | |
77 | ||
78 | static int ecb_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
79 | unsigned int key_len) | |
80 | { | |
81 | struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm); | |
82 | ||
83 | if (key_len != SECKEYBLOBSIZE) | |
84 | return -EINVAL; | |
85 | ||
86 | memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE); | |
87 | if (__paes_set_key(ctx)) { | |
88 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
89 | return -EINVAL; | |
90 | } | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static int ecb_paes_crypt(struct blkcipher_desc *desc, | |
95 | unsigned long modifier, | |
96 | struct blkcipher_walk *walk) | |
97 | { | |
98 | struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
99 | unsigned int nbytes, n, k; | |
100 | int ret; | |
101 | ||
102 | ret = blkcipher_walk_virt(desc, walk); | |
103 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
104 | /* only use complete blocks */ | |
105 | n = nbytes & ~(AES_BLOCK_SIZE - 1); | |
106 | k = cpacf_km(ctx->fc | modifier, ctx->pk.protkey, | |
107 | walk->dst.virt.addr, walk->src.virt.addr, n); | |
108 | if (k) | |
109 | ret = blkcipher_walk_done(desc, walk, nbytes - k); | |
110 | if (k < n) { | |
111 | if (__paes_set_key(ctx) != 0) | |
112 | return blkcipher_walk_done(desc, walk, -EIO); | |
113 | } | |
114 | } | |
115 | return ret; | |
116 | } | |
117 | ||
118 | static int ecb_paes_encrypt(struct blkcipher_desc *desc, | |
119 | struct scatterlist *dst, struct scatterlist *src, | |
120 | unsigned int nbytes) | |
121 | { | |
122 | struct blkcipher_walk walk; | |
123 | ||
124 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
125 | return ecb_paes_crypt(desc, CPACF_ENCRYPT, &walk); | |
126 | } | |
127 | ||
128 | static int ecb_paes_decrypt(struct blkcipher_desc *desc, | |
129 | struct scatterlist *dst, struct scatterlist *src, | |
130 | unsigned int nbytes) | |
131 | { | |
132 | struct blkcipher_walk walk; | |
133 | ||
134 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
135 | return ecb_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
136 | } | |
137 | ||
138 | static struct crypto_alg ecb_paes_alg = { | |
139 | .cra_name = "ecb(paes)", | |
140 | .cra_driver_name = "ecb-paes-s390", | |
141 | .cra_priority = 400, /* combo: aes + ecb */ | |
142 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
143 | .cra_blocksize = AES_BLOCK_SIZE, | |
144 | .cra_ctxsize = sizeof(struct s390_paes_ctx), | |
145 | .cra_type = &crypto_blkcipher_type, | |
146 | .cra_module = THIS_MODULE, | |
147 | .cra_list = LIST_HEAD_INIT(ecb_paes_alg.cra_list), | |
148 | .cra_u = { | |
149 | .blkcipher = { | |
150 | .min_keysize = SECKEYBLOBSIZE, | |
151 | .max_keysize = SECKEYBLOBSIZE, | |
152 | .setkey = ecb_paes_set_key, | |
153 | .encrypt = ecb_paes_encrypt, | |
154 | .decrypt = ecb_paes_decrypt, | |
155 | } | |
156 | } | |
157 | }; | |
158 | ||
159 | static int __cbc_paes_set_key(struct s390_paes_ctx *ctx) | |
160 | { | |
161 | unsigned long fc; | |
162 | ||
163 | if (__paes_convert_key(&ctx->sk, &ctx->pk)) | |
164 | return -EINVAL; | |
165 | ||
166 | /* Pick the correct function code based on the protected key type */ | |
167 | fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 : | |
168 | (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMC_PAES_192 : | |
169 | (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KMC_PAES_256 : 0; | |
170 | ||
171 | /* Check if the function code is available */ | |
172 | ctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0; | |
173 | ||
174 | return ctx->fc ? 0 : -EINVAL; | |
175 | } | |
176 | ||
177 | static int cbc_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
178 | unsigned int key_len) | |
179 | { | |
180 | struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm); | |
181 | ||
182 | memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE); | |
183 | if (__cbc_paes_set_key(ctx)) { | |
184 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
185 | return -EINVAL; | |
186 | } | |
187 | return 0; | |
188 | } | |
189 | ||
190 | static int cbc_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier, | |
191 | struct blkcipher_walk *walk) | |
192 | { | |
193 | struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
194 | unsigned int nbytes, n, k; | |
195 | int ret; | |
196 | struct { | |
197 | u8 iv[AES_BLOCK_SIZE]; | |
198 | u8 key[MAXPROTKEYSIZE]; | |
199 | } param; | |
200 | ||
201 | ret = blkcipher_walk_virt(desc, walk); | |
202 | memcpy(param.iv, walk->iv, AES_BLOCK_SIZE); | |
203 | memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE); | |
204 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
205 | /* only use complete blocks */ | |
206 | n = nbytes & ~(AES_BLOCK_SIZE - 1); | |
207 | k = cpacf_kmc(ctx->fc | modifier, ¶m, | |
208 | walk->dst.virt.addr, walk->src.virt.addr, n); | |
209 | if (k) | |
210 | ret = blkcipher_walk_done(desc, walk, nbytes - k); | |
211 | if (n < k) { | |
212 | if (__cbc_paes_set_key(ctx) != 0) | |
213 | return blkcipher_walk_done(desc, walk, -EIO); | |
214 | memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE); | |
215 | } | |
216 | } | |
217 | memcpy(walk->iv, param.iv, AES_BLOCK_SIZE); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | static int cbc_paes_encrypt(struct blkcipher_desc *desc, | |
222 | struct scatterlist *dst, struct scatterlist *src, | |
223 | unsigned int nbytes) | |
224 | { | |
225 | struct blkcipher_walk walk; | |
226 | ||
227 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
228 | return cbc_paes_crypt(desc, 0, &walk); | |
229 | } | |
230 | ||
231 | static int cbc_paes_decrypt(struct blkcipher_desc *desc, | |
232 | struct scatterlist *dst, struct scatterlist *src, | |
233 | unsigned int nbytes) | |
234 | { | |
235 | struct blkcipher_walk walk; | |
236 | ||
237 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
238 | return cbc_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
239 | } | |
240 | ||
241 | static struct crypto_alg cbc_paes_alg = { | |
242 | .cra_name = "cbc(paes)", | |
243 | .cra_driver_name = "cbc-paes-s390", | |
244 | .cra_priority = 400, /* combo: aes + cbc */ | |
245 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
246 | .cra_blocksize = AES_BLOCK_SIZE, | |
247 | .cra_ctxsize = sizeof(struct s390_paes_ctx), | |
248 | .cra_type = &crypto_blkcipher_type, | |
249 | .cra_module = THIS_MODULE, | |
250 | .cra_list = LIST_HEAD_INIT(cbc_paes_alg.cra_list), | |
251 | .cra_u = { | |
252 | .blkcipher = { | |
253 | .min_keysize = SECKEYBLOBSIZE, | |
254 | .max_keysize = SECKEYBLOBSIZE, | |
255 | .ivsize = AES_BLOCK_SIZE, | |
256 | .setkey = cbc_paes_set_key, | |
257 | .encrypt = cbc_paes_encrypt, | |
258 | .decrypt = cbc_paes_decrypt, | |
259 | } | |
260 | } | |
261 | }; | |
262 | ||
263 | static int __xts_paes_set_key(struct s390_pxts_ctx *ctx) | |
264 | { | |
265 | unsigned long fc; | |
266 | ||
267 | if (__paes_convert_key(&ctx->sk[0], &ctx->pk[0]) || | |
268 | __paes_convert_key(&ctx->sk[1], &ctx->pk[1])) | |
269 | return -EINVAL; | |
270 | ||
271 | if (ctx->pk[0].type != ctx->pk[1].type) | |
272 | return -EINVAL; | |
273 | ||
274 | /* Pick the correct function code based on the protected key type */ | |
275 | fc = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PXTS_128 : | |
276 | (ctx->pk[0].type == PKEY_KEYTYPE_AES_256) ? | |
277 | CPACF_KM_PXTS_256 : 0; | |
278 | ||
279 | /* Check if the function code is available */ | |
280 | ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0; | |
281 | ||
282 | return ctx->fc ? 0 : -EINVAL; | |
283 | } | |
284 | ||
285 | static int xts_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
286 | unsigned int key_len) | |
287 | { | |
288 | struct s390_pxts_ctx *ctx = crypto_tfm_ctx(tfm); | |
289 | u8 ckey[2 * AES_MAX_KEY_SIZE]; | |
290 | unsigned int ckey_len; | |
291 | ||
292 | memcpy(ctx->sk[0].seckey, in_key, SECKEYBLOBSIZE); | |
293 | memcpy(ctx->sk[1].seckey, in_key + SECKEYBLOBSIZE, SECKEYBLOBSIZE); | |
294 | if (__xts_paes_set_key(ctx)) { | |
295 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
296 | return -EINVAL; | |
297 | } | |
298 | ||
299 | /* | |
300 | * xts_check_key verifies the key length is not odd and makes | |
301 | * sure that the two keys are not the same. This can be done | |
302 | * on the two protected keys as well | |
303 | */ | |
304 | ckey_len = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? | |
305 | AES_KEYSIZE_128 : AES_KEYSIZE_256; | |
306 | memcpy(ckey, ctx->pk[0].protkey, ckey_len); | |
307 | memcpy(ckey + ckey_len, ctx->pk[1].protkey, ckey_len); | |
308 | return xts_check_key(tfm, ckey, 2*ckey_len); | |
309 | } | |
310 | ||
311 | static int xts_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier, | |
312 | struct blkcipher_walk *walk) | |
313 | { | |
314 | struct s390_pxts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
315 | unsigned int keylen, offset, nbytes, n, k; | |
316 | int ret; | |
317 | struct { | |
318 | u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */ | |
319 | u8 tweak[16]; | |
320 | u8 block[16]; | |
321 | u8 bit[16]; | |
322 | u8 xts[16]; | |
323 | } pcc_param; | |
324 | struct { | |
325 | u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */ | |
326 | u8 init[16]; | |
327 | } xts_param; | |
328 | ||
329 | ret = blkcipher_walk_virt(desc, walk); | |
330 | keylen = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 48 : 64; | |
331 | offset = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 16 : 0; | |
332 | retry: | |
333 | memset(&pcc_param, 0, sizeof(pcc_param)); | |
334 | memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak)); | |
335 | memcpy(pcc_param.key + offset, ctx->pk[1].protkey, keylen); | |
336 | cpacf_pcc(ctx->fc, pcc_param.key + offset); | |
337 | ||
338 | memcpy(xts_param.key + offset, ctx->pk[0].protkey, keylen); | |
339 | memcpy(xts_param.init, pcc_param.xts, 16); | |
340 | ||
341 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
342 | /* only use complete blocks */ | |
343 | n = nbytes & ~(AES_BLOCK_SIZE - 1); | |
344 | k = cpacf_km(ctx->fc | modifier, xts_param.key + offset, | |
345 | walk->dst.virt.addr, walk->src.virt.addr, n); | |
346 | if (k) | |
347 | ret = blkcipher_walk_done(desc, walk, nbytes - k); | |
348 | if (k < n) { | |
349 | if (__xts_paes_set_key(ctx) != 0) | |
350 | return blkcipher_walk_done(desc, walk, -EIO); | |
351 | goto retry; | |
352 | } | |
353 | } | |
354 | return ret; | |
355 | } | |
356 | ||
357 | static int xts_paes_encrypt(struct blkcipher_desc *desc, | |
358 | struct scatterlist *dst, struct scatterlist *src, | |
359 | unsigned int nbytes) | |
360 | { | |
361 | struct blkcipher_walk walk; | |
362 | ||
363 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
364 | return xts_paes_crypt(desc, 0, &walk); | |
365 | } | |
366 | ||
367 | static int xts_paes_decrypt(struct blkcipher_desc *desc, | |
368 | struct scatterlist *dst, struct scatterlist *src, | |
369 | unsigned int nbytes) | |
370 | { | |
371 | struct blkcipher_walk walk; | |
372 | ||
373 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
374 | return xts_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
375 | } | |
376 | ||
377 | static struct crypto_alg xts_paes_alg = { | |
378 | .cra_name = "xts(paes)", | |
379 | .cra_driver_name = "xts-paes-s390", | |
380 | .cra_priority = 400, /* combo: aes + xts */ | |
381 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
382 | .cra_blocksize = AES_BLOCK_SIZE, | |
383 | .cra_ctxsize = sizeof(struct s390_pxts_ctx), | |
384 | .cra_type = &crypto_blkcipher_type, | |
385 | .cra_module = THIS_MODULE, | |
386 | .cra_list = LIST_HEAD_INIT(xts_paes_alg.cra_list), | |
387 | .cra_u = { | |
388 | .blkcipher = { | |
389 | .min_keysize = 2 * SECKEYBLOBSIZE, | |
390 | .max_keysize = 2 * SECKEYBLOBSIZE, | |
391 | .ivsize = AES_BLOCK_SIZE, | |
392 | .setkey = xts_paes_set_key, | |
393 | .encrypt = xts_paes_encrypt, | |
394 | .decrypt = xts_paes_decrypt, | |
395 | } | |
396 | } | |
397 | }; | |
398 | ||
399 | static int __ctr_paes_set_key(struct s390_paes_ctx *ctx) | |
400 | { | |
401 | unsigned long fc; | |
402 | ||
403 | if (__paes_convert_key(&ctx->sk, &ctx->pk)) | |
404 | return -EINVAL; | |
405 | ||
406 | /* Pick the correct function code based on the protected key type */ | |
407 | fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 : | |
408 | (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMCTR_PAES_192 : | |
409 | (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? | |
410 | CPACF_KMCTR_PAES_256 : 0; | |
411 | ||
412 | /* Check if the function code is available */ | |
413 | ctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0; | |
414 | ||
415 | return ctx->fc ? 0 : -EINVAL; | |
416 | } | |
417 | ||
418 | static int ctr_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
419 | unsigned int key_len) | |
420 | { | |
421 | struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm); | |
422 | ||
423 | memcpy(ctx->sk.seckey, in_key, key_len); | |
424 | if (__ctr_paes_set_key(ctx)) { | |
425 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
426 | return -EINVAL; | |
427 | } | |
428 | return 0; | |
429 | } | |
430 | ||
431 | static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes) | |
432 | { | |
433 | unsigned int i, n; | |
434 | ||
435 | /* only use complete blocks, max. PAGE_SIZE */ | |
436 | memcpy(ctrptr, iv, AES_BLOCK_SIZE); | |
437 | n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1); | |
438 | for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) { | |
439 | memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE); | |
440 | crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE); | |
441 | ctrptr += AES_BLOCK_SIZE; | |
442 | } | |
443 | return n; | |
444 | } | |
445 | ||
446 | static int ctr_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier, | |
447 | struct blkcipher_walk *walk) | |
448 | { | |
449 | struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
450 | u8 buf[AES_BLOCK_SIZE], *ctrptr; | |
451 | unsigned int nbytes, n, k; | |
452 | int ret, locked; | |
453 | ||
454 | locked = spin_trylock(&ctrblk_lock); | |
455 | ||
456 | ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE); | |
457 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
458 | n = AES_BLOCK_SIZE; | |
459 | if (nbytes >= 2*AES_BLOCK_SIZE && locked) | |
460 | n = __ctrblk_init(ctrblk, walk->iv, nbytes); | |
461 | ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv; | |
462 | k = cpacf_kmctr(ctx->fc | modifier, ctx->pk.protkey, | |
463 | walk->dst.virt.addr, walk->src.virt.addr, | |
464 | n, ctrptr); | |
465 | if (k) { | |
466 | if (ctrptr == ctrblk) | |
467 | memcpy(walk->iv, ctrptr + k - AES_BLOCK_SIZE, | |
468 | AES_BLOCK_SIZE); | |
469 | crypto_inc(walk->iv, AES_BLOCK_SIZE); | |
470 | ret = blkcipher_walk_done(desc, walk, nbytes - n); | |
471 | } | |
472 | if (k < n) { | |
e7c95eff MS |
473 | if (__ctr_paes_set_key(ctx) != 0) { |
474 | if (locked) | |
475 | spin_unlock(&ctrblk_lock); | |
27937843 | 476 | return blkcipher_walk_done(desc, walk, -EIO); |
e7c95eff | 477 | } |
27937843 MS |
478 | } |
479 | } | |
480 | if (locked) | |
481 | spin_unlock(&ctrblk_lock); | |
482 | /* | |
483 | * final block may be < AES_BLOCK_SIZE, copy only nbytes | |
484 | */ | |
485 | if (nbytes) { | |
486 | while (1) { | |
487 | if (cpacf_kmctr(ctx->fc | modifier, | |
488 | ctx->pk.protkey, buf, | |
489 | walk->src.virt.addr, AES_BLOCK_SIZE, | |
490 | walk->iv) == AES_BLOCK_SIZE) | |
491 | break; | |
492 | if (__ctr_paes_set_key(ctx) != 0) | |
493 | return blkcipher_walk_done(desc, walk, -EIO); | |
494 | } | |
495 | memcpy(walk->dst.virt.addr, buf, nbytes); | |
496 | crypto_inc(walk->iv, AES_BLOCK_SIZE); | |
497 | ret = blkcipher_walk_done(desc, walk, 0); | |
498 | } | |
499 | ||
500 | return ret; | |
501 | } | |
502 | ||
503 | static int ctr_paes_encrypt(struct blkcipher_desc *desc, | |
504 | struct scatterlist *dst, struct scatterlist *src, | |
505 | unsigned int nbytes) | |
506 | { | |
507 | struct blkcipher_walk walk; | |
508 | ||
509 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
510 | return ctr_paes_crypt(desc, 0, &walk); | |
511 | } | |
512 | ||
513 | static int ctr_paes_decrypt(struct blkcipher_desc *desc, | |
514 | struct scatterlist *dst, struct scatterlist *src, | |
515 | unsigned int nbytes) | |
516 | { | |
517 | struct blkcipher_walk walk; | |
518 | ||
519 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
520 | return ctr_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
521 | } | |
522 | ||
523 | static struct crypto_alg ctr_paes_alg = { | |
524 | .cra_name = "ctr(paes)", | |
525 | .cra_driver_name = "ctr-paes-s390", | |
526 | .cra_priority = 400, /* combo: aes + ctr */ | |
527 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
528 | .cra_blocksize = 1, | |
529 | .cra_ctxsize = sizeof(struct s390_paes_ctx), | |
530 | .cra_type = &crypto_blkcipher_type, | |
531 | .cra_module = THIS_MODULE, | |
532 | .cra_list = LIST_HEAD_INIT(ctr_paes_alg.cra_list), | |
533 | .cra_u = { | |
534 | .blkcipher = { | |
535 | .min_keysize = SECKEYBLOBSIZE, | |
536 | .max_keysize = SECKEYBLOBSIZE, | |
537 | .ivsize = AES_BLOCK_SIZE, | |
538 | .setkey = ctr_paes_set_key, | |
539 | .encrypt = ctr_paes_encrypt, | |
540 | .decrypt = ctr_paes_decrypt, | |
541 | } | |
542 | } | |
543 | }; | |
544 | ||
545 | static inline void __crypto_unregister_alg(struct crypto_alg *alg) | |
546 | { | |
547 | if (!list_empty(&alg->cra_list)) | |
548 | crypto_unregister_alg(alg); | |
549 | } | |
550 | ||
551 | static void paes_s390_fini(void) | |
552 | { | |
553 | if (ctrblk) | |
554 | free_page((unsigned long) ctrblk); | |
555 | __crypto_unregister_alg(&ctr_paes_alg); | |
556 | __crypto_unregister_alg(&xts_paes_alg); | |
557 | __crypto_unregister_alg(&cbc_paes_alg); | |
558 | __crypto_unregister_alg(&ecb_paes_alg); | |
559 | } | |
560 | ||
561 | static int __init paes_s390_init(void) | |
562 | { | |
563 | int ret; | |
564 | ||
565 | /* Query available functions for KM, KMC and KMCTR */ | |
566 | cpacf_query(CPACF_KM, &km_functions); | |
567 | cpacf_query(CPACF_KMC, &kmc_functions); | |
568 | cpacf_query(CPACF_KMCTR, &kmctr_functions); | |
569 | ||
570 | if (cpacf_test_func(&km_functions, CPACF_KM_PAES_128) || | |
571 | cpacf_test_func(&km_functions, CPACF_KM_PAES_192) || | |
572 | cpacf_test_func(&km_functions, CPACF_KM_PAES_256)) { | |
573 | ret = crypto_register_alg(&ecb_paes_alg); | |
574 | if (ret) | |
575 | goto out_err; | |
576 | } | |
577 | ||
578 | if (cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) || | |
579 | cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) || | |
580 | cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256)) { | |
581 | ret = crypto_register_alg(&cbc_paes_alg); | |
582 | if (ret) | |
583 | goto out_err; | |
584 | } | |
585 | ||
586 | if (cpacf_test_func(&km_functions, CPACF_KM_PXTS_128) || | |
587 | cpacf_test_func(&km_functions, CPACF_KM_PXTS_256)) { | |
588 | ret = crypto_register_alg(&xts_paes_alg); | |
589 | if (ret) | |
590 | goto out_err; | |
591 | } | |
592 | ||
593 | if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) || | |
594 | cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) || | |
595 | cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) { | |
596 | ret = crypto_register_alg(&ctr_paes_alg); | |
597 | if (ret) | |
598 | goto out_err; | |
599 | ctrblk = (u8 *) __get_free_page(GFP_KERNEL); | |
600 | if (!ctrblk) { | |
601 | ret = -ENOMEM; | |
602 | goto out_err; | |
603 | } | |
604 | } | |
605 | ||
606 | return 0; | |
607 | out_err: | |
608 | paes_s390_fini(); | |
609 | return ret; | |
610 | } | |
611 | ||
612 | module_init(paes_s390_init); | |
613 | module_exit(paes_s390_fini); | |
614 | ||
284c43e6 | 615 | MODULE_ALIAS_CRYPTO("paes"); |
27937843 MS |
616 | |
617 | MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm with protected keys"); | |
618 | MODULE_LICENSE("GPL"); |