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27937843 MS |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * s390 implementation of the AES Cipher Algorithm with protected keys. | |
5 | * | |
6 | * s390 Version: | |
7 | * Copyright IBM Corp. 2017 | |
8 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
9 | * Harald Freudenberger <freude@de.ibm.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License (version 2 only) | |
13 | * as published by the Free Software Foundation. | |
14 | * | |
15 | */ | |
16 | ||
17 | #define KMSG_COMPONENT "paes_s390" | |
18 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
19 | ||
20 | #include <crypto/aes.h> | |
21 | #include <crypto/algapi.h> | |
22 | #include <linux/bug.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/cpufeature.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <crypto/xts.h> | |
29 | #include <asm/cpacf.h> | |
30 | #include <asm/pkey.h> | |
31 | ||
32 | static u8 *ctrblk; | |
33 | static DEFINE_SPINLOCK(ctrblk_lock); | |
34 | ||
35 | static cpacf_mask_t km_functions, kmc_functions, kmctr_functions; | |
36 | ||
37 | struct s390_paes_ctx { | |
38 | struct pkey_seckey sk; | |
39 | struct pkey_protkey pk; | |
40 | unsigned long fc; | |
41 | }; | |
42 | ||
43 | struct s390_pxts_ctx { | |
44 | struct pkey_seckey sk[2]; | |
45 | struct pkey_protkey pk[2]; | |
46 | unsigned long fc; | |
47 | }; | |
48 | ||
49 | static inline int __paes_convert_key(struct pkey_seckey *sk, | |
50 | struct pkey_protkey *pk) | |
51 | { | |
52 | int i, ret; | |
53 | ||
54 | /* try three times in case of failure */ | |
55 | for (i = 0; i < 3; i++) { | |
56 | ret = pkey_skey2pkey(sk, pk); | |
57 | if (ret == 0) | |
58 | break; | |
59 | } | |
60 | ||
61 | return ret; | |
62 | } | |
63 | ||
64 | static int __paes_set_key(struct s390_paes_ctx *ctx) | |
65 | { | |
66 | unsigned long fc; | |
67 | ||
68 | if (__paes_convert_key(&ctx->sk, &ctx->pk)) | |
69 | return -EINVAL; | |
70 | ||
71 | /* Pick the correct function code based on the protected key type */ | |
72 | fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 : | |
73 | (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 : | |
74 | (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0; | |
75 | ||
76 | /* Check if the function code is available */ | |
77 | ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0; | |
78 | ||
79 | return ctx->fc ? 0 : -EINVAL; | |
80 | } | |
81 | ||
82 | static int ecb_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
83 | unsigned int key_len) | |
84 | { | |
85 | struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm); | |
86 | ||
87 | if (key_len != SECKEYBLOBSIZE) | |
88 | return -EINVAL; | |
89 | ||
90 | memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE); | |
91 | if (__paes_set_key(ctx)) { | |
92 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
93 | return -EINVAL; | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static int ecb_paes_crypt(struct blkcipher_desc *desc, | |
99 | unsigned long modifier, | |
100 | struct blkcipher_walk *walk) | |
101 | { | |
102 | struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
103 | unsigned int nbytes, n, k; | |
104 | int ret; | |
105 | ||
106 | ret = blkcipher_walk_virt(desc, walk); | |
107 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
108 | /* only use complete blocks */ | |
109 | n = nbytes & ~(AES_BLOCK_SIZE - 1); | |
110 | k = cpacf_km(ctx->fc | modifier, ctx->pk.protkey, | |
111 | walk->dst.virt.addr, walk->src.virt.addr, n); | |
112 | if (k) | |
113 | ret = blkcipher_walk_done(desc, walk, nbytes - k); | |
114 | if (k < n) { | |
115 | if (__paes_set_key(ctx) != 0) | |
116 | return blkcipher_walk_done(desc, walk, -EIO); | |
117 | } | |
118 | } | |
119 | return ret; | |
120 | } | |
121 | ||
122 | static int ecb_paes_encrypt(struct blkcipher_desc *desc, | |
123 | struct scatterlist *dst, struct scatterlist *src, | |
124 | unsigned int nbytes) | |
125 | { | |
126 | struct blkcipher_walk walk; | |
127 | ||
128 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
129 | return ecb_paes_crypt(desc, CPACF_ENCRYPT, &walk); | |
130 | } | |
131 | ||
132 | static int ecb_paes_decrypt(struct blkcipher_desc *desc, | |
133 | struct scatterlist *dst, struct scatterlist *src, | |
134 | unsigned int nbytes) | |
135 | { | |
136 | struct blkcipher_walk walk; | |
137 | ||
138 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
139 | return ecb_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
140 | } | |
141 | ||
142 | static struct crypto_alg ecb_paes_alg = { | |
143 | .cra_name = "ecb(paes)", | |
144 | .cra_driver_name = "ecb-paes-s390", | |
145 | .cra_priority = 400, /* combo: aes + ecb */ | |
146 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
147 | .cra_blocksize = AES_BLOCK_SIZE, | |
148 | .cra_ctxsize = sizeof(struct s390_paes_ctx), | |
149 | .cra_type = &crypto_blkcipher_type, | |
150 | .cra_module = THIS_MODULE, | |
151 | .cra_list = LIST_HEAD_INIT(ecb_paes_alg.cra_list), | |
152 | .cra_u = { | |
153 | .blkcipher = { | |
154 | .min_keysize = SECKEYBLOBSIZE, | |
155 | .max_keysize = SECKEYBLOBSIZE, | |
156 | .setkey = ecb_paes_set_key, | |
157 | .encrypt = ecb_paes_encrypt, | |
158 | .decrypt = ecb_paes_decrypt, | |
159 | } | |
160 | } | |
161 | }; | |
162 | ||
163 | static int __cbc_paes_set_key(struct s390_paes_ctx *ctx) | |
164 | { | |
165 | unsigned long fc; | |
166 | ||
167 | if (__paes_convert_key(&ctx->sk, &ctx->pk)) | |
168 | return -EINVAL; | |
169 | ||
170 | /* Pick the correct function code based on the protected key type */ | |
171 | fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 : | |
172 | (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMC_PAES_192 : | |
173 | (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KMC_PAES_256 : 0; | |
174 | ||
175 | /* Check if the function code is available */ | |
176 | ctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0; | |
177 | ||
178 | return ctx->fc ? 0 : -EINVAL; | |
179 | } | |
180 | ||
181 | static int cbc_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
182 | unsigned int key_len) | |
183 | { | |
184 | struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm); | |
185 | ||
186 | memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE); | |
187 | if (__cbc_paes_set_key(ctx)) { | |
188 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
189 | return -EINVAL; | |
190 | } | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int cbc_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier, | |
195 | struct blkcipher_walk *walk) | |
196 | { | |
197 | struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
198 | unsigned int nbytes, n, k; | |
199 | int ret; | |
200 | struct { | |
201 | u8 iv[AES_BLOCK_SIZE]; | |
202 | u8 key[MAXPROTKEYSIZE]; | |
203 | } param; | |
204 | ||
205 | ret = blkcipher_walk_virt(desc, walk); | |
206 | memcpy(param.iv, walk->iv, AES_BLOCK_SIZE); | |
207 | memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE); | |
208 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
209 | /* only use complete blocks */ | |
210 | n = nbytes & ~(AES_BLOCK_SIZE - 1); | |
211 | k = cpacf_kmc(ctx->fc | modifier, ¶m, | |
212 | walk->dst.virt.addr, walk->src.virt.addr, n); | |
213 | if (k) | |
214 | ret = blkcipher_walk_done(desc, walk, nbytes - k); | |
215 | if (n < k) { | |
216 | if (__cbc_paes_set_key(ctx) != 0) | |
217 | return blkcipher_walk_done(desc, walk, -EIO); | |
218 | memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE); | |
219 | } | |
220 | } | |
221 | memcpy(walk->iv, param.iv, AES_BLOCK_SIZE); | |
222 | return ret; | |
223 | } | |
224 | ||
225 | static int cbc_paes_encrypt(struct blkcipher_desc *desc, | |
226 | struct scatterlist *dst, struct scatterlist *src, | |
227 | unsigned int nbytes) | |
228 | { | |
229 | struct blkcipher_walk walk; | |
230 | ||
231 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
232 | return cbc_paes_crypt(desc, 0, &walk); | |
233 | } | |
234 | ||
235 | static int cbc_paes_decrypt(struct blkcipher_desc *desc, | |
236 | struct scatterlist *dst, struct scatterlist *src, | |
237 | unsigned int nbytes) | |
238 | { | |
239 | struct blkcipher_walk walk; | |
240 | ||
241 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
242 | return cbc_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
243 | } | |
244 | ||
245 | static struct crypto_alg cbc_paes_alg = { | |
246 | .cra_name = "cbc(paes)", | |
247 | .cra_driver_name = "cbc-paes-s390", | |
248 | .cra_priority = 400, /* combo: aes + cbc */ | |
249 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
250 | .cra_blocksize = AES_BLOCK_SIZE, | |
251 | .cra_ctxsize = sizeof(struct s390_paes_ctx), | |
252 | .cra_type = &crypto_blkcipher_type, | |
253 | .cra_module = THIS_MODULE, | |
254 | .cra_list = LIST_HEAD_INIT(cbc_paes_alg.cra_list), | |
255 | .cra_u = { | |
256 | .blkcipher = { | |
257 | .min_keysize = SECKEYBLOBSIZE, | |
258 | .max_keysize = SECKEYBLOBSIZE, | |
259 | .ivsize = AES_BLOCK_SIZE, | |
260 | .setkey = cbc_paes_set_key, | |
261 | .encrypt = cbc_paes_encrypt, | |
262 | .decrypt = cbc_paes_decrypt, | |
263 | } | |
264 | } | |
265 | }; | |
266 | ||
267 | static int __xts_paes_set_key(struct s390_pxts_ctx *ctx) | |
268 | { | |
269 | unsigned long fc; | |
270 | ||
271 | if (__paes_convert_key(&ctx->sk[0], &ctx->pk[0]) || | |
272 | __paes_convert_key(&ctx->sk[1], &ctx->pk[1])) | |
273 | return -EINVAL; | |
274 | ||
275 | if (ctx->pk[0].type != ctx->pk[1].type) | |
276 | return -EINVAL; | |
277 | ||
278 | /* Pick the correct function code based on the protected key type */ | |
279 | fc = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PXTS_128 : | |
280 | (ctx->pk[0].type == PKEY_KEYTYPE_AES_256) ? | |
281 | CPACF_KM_PXTS_256 : 0; | |
282 | ||
283 | /* Check if the function code is available */ | |
284 | ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0; | |
285 | ||
286 | return ctx->fc ? 0 : -EINVAL; | |
287 | } | |
288 | ||
289 | static int xts_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
290 | unsigned int key_len) | |
291 | { | |
292 | struct s390_pxts_ctx *ctx = crypto_tfm_ctx(tfm); | |
293 | u8 ckey[2 * AES_MAX_KEY_SIZE]; | |
294 | unsigned int ckey_len; | |
295 | ||
296 | memcpy(ctx->sk[0].seckey, in_key, SECKEYBLOBSIZE); | |
297 | memcpy(ctx->sk[1].seckey, in_key + SECKEYBLOBSIZE, SECKEYBLOBSIZE); | |
298 | if (__xts_paes_set_key(ctx)) { | |
299 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
300 | return -EINVAL; | |
301 | } | |
302 | ||
303 | /* | |
304 | * xts_check_key verifies the key length is not odd and makes | |
305 | * sure that the two keys are not the same. This can be done | |
306 | * on the two protected keys as well | |
307 | */ | |
308 | ckey_len = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? | |
309 | AES_KEYSIZE_128 : AES_KEYSIZE_256; | |
310 | memcpy(ckey, ctx->pk[0].protkey, ckey_len); | |
311 | memcpy(ckey + ckey_len, ctx->pk[1].protkey, ckey_len); | |
312 | return xts_check_key(tfm, ckey, 2*ckey_len); | |
313 | } | |
314 | ||
315 | static int xts_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier, | |
316 | struct blkcipher_walk *walk) | |
317 | { | |
318 | struct s390_pxts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
319 | unsigned int keylen, offset, nbytes, n, k; | |
320 | int ret; | |
321 | struct { | |
322 | u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */ | |
323 | u8 tweak[16]; | |
324 | u8 block[16]; | |
325 | u8 bit[16]; | |
326 | u8 xts[16]; | |
327 | } pcc_param; | |
328 | struct { | |
329 | u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */ | |
330 | u8 init[16]; | |
331 | } xts_param; | |
332 | ||
333 | ret = blkcipher_walk_virt(desc, walk); | |
334 | keylen = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 48 : 64; | |
335 | offset = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 16 : 0; | |
336 | retry: | |
337 | memset(&pcc_param, 0, sizeof(pcc_param)); | |
338 | memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak)); | |
339 | memcpy(pcc_param.key + offset, ctx->pk[1].protkey, keylen); | |
340 | cpacf_pcc(ctx->fc, pcc_param.key + offset); | |
341 | ||
342 | memcpy(xts_param.key + offset, ctx->pk[0].protkey, keylen); | |
343 | memcpy(xts_param.init, pcc_param.xts, 16); | |
344 | ||
345 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
346 | /* only use complete blocks */ | |
347 | n = nbytes & ~(AES_BLOCK_SIZE - 1); | |
348 | k = cpacf_km(ctx->fc | modifier, xts_param.key + offset, | |
349 | walk->dst.virt.addr, walk->src.virt.addr, n); | |
350 | if (k) | |
351 | ret = blkcipher_walk_done(desc, walk, nbytes - k); | |
352 | if (k < n) { | |
353 | if (__xts_paes_set_key(ctx) != 0) | |
354 | return blkcipher_walk_done(desc, walk, -EIO); | |
355 | goto retry; | |
356 | } | |
357 | } | |
358 | return ret; | |
359 | } | |
360 | ||
361 | static int xts_paes_encrypt(struct blkcipher_desc *desc, | |
362 | struct scatterlist *dst, struct scatterlist *src, | |
363 | unsigned int nbytes) | |
364 | { | |
365 | struct blkcipher_walk walk; | |
366 | ||
367 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
368 | return xts_paes_crypt(desc, 0, &walk); | |
369 | } | |
370 | ||
371 | static int xts_paes_decrypt(struct blkcipher_desc *desc, | |
372 | struct scatterlist *dst, struct scatterlist *src, | |
373 | unsigned int nbytes) | |
374 | { | |
375 | struct blkcipher_walk walk; | |
376 | ||
377 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
378 | return xts_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
379 | } | |
380 | ||
381 | static struct crypto_alg xts_paes_alg = { | |
382 | .cra_name = "xts(paes)", | |
383 | .cra_driver_name = "xts-paes-s390", | |
384 | .cra_priority = 400, /* combo: aes + xts */ | |
385 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
386 | .cra_blocksize = AES_BLOCK_SIZE, | |
387 | .cra_ctxsize = sizeof(struct s390_pxts_ctx), | |
388 | .cra_type = &crypto_blkcipher_type, | |
389 | .cra_module = THIS_MODULE, | |
390 | .cra_list = LIST_HEAD_INIT(xts_paes_alg.cra_list), | |
391 | .cra_u = { | |
392 | .blkcipher = { | |
393 | .min_keysize = 2 * SECKEYBLOBSIZE, | |
394 | .max_keysize = 2 * SECKEYBLOBSIZE, | |
395 | .ivsize = AES_BLOCK_SIZE, | |
396 | .setkey = xts_paes_set_key, | |
397 | .encrypt = xts_paes_encrypt, | |
398 | .decrypt = xts_paes_decrypt, | |
399 | } | |
400 | } | |
401 | }; | |
402 | ||
403 | static int __ctr_paes_set_key(struct s390_paes_ctx *ctx) | |
404 | { | |
405 | unsigned long fc; | |
406 | ||
407 | if (__paes_convert_key(&ctx->sk, &ctx->pk)) | |
408 | return -EINVAL; | |
409 | ||
410 | /* Pick the correct function code based on the protected key type */ | |
411 | fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 : | |
412 | (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMCTR_PAES_192 : | |
413 | (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? | |
414 | CPACF_KMCTR_PAES_256 : 0; | |
415 | ||
416 | /* Check if the function code is available */ | |
417 | ctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0; | |
418 | ||
419 | return ctx->fc ? 0 : -EINVAL; | |
420 | } | |
421 | ||
422 | static int ctr_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key, | |
423 | unsigned int key_len) | |
424 | { | |
425 | struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm); | |
426 | ||
427 | memcpy(ctx->sk.seckey, in_key, key_len); | |
428 | if (__ctr_paes_set_key(ctx)) { | |
429 | tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; | |
430 | return -EINVAL; | |
431 | } | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes) | |
436 | { | |
437 | unsigned int i, n; | |
438 | ||
439 | /* only use complete blocks, max. PAGE_SIZE */ | |
440 | memcpy(ctrptr, iv, AES_BLOCK_SIZE); | |
441 | n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1); | |
442 | for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) { | |
443 | memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE); | |
444 | crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE); | |
445 | ctrptr += AES_BLOCK_SIZE; | |
446 | } | |
447 | return n; | |
448 | } | |
449 | ||
450 | static int ctr_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier, | |
451 | struct blkcipher_walk *walk) | |
452 | { | |
453 | struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
454 | u8 buf[AES_BLOCK_SIZE], *ctrptr; | |
455 | unsigned int nbytes, n, k; | |
456 | int ret, locked; | |
457 | ||
458 | locked = spin_trylock(&ctrblk_lock); | |
459 | ||
460 | ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE); | |
461 | while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) { | |
462 | n = AES_BLOCK_SIZE; | |
463 | if (nbytes >= 2*AES_BLOCK_SIZE && locked) | |
464 | n = __ctrblk_init(ctrblk, walk->iv, nbytes); | |
465 | ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv; | |
466 | k = cpacf_kmctr(ctx->fc | modifier, ctx->pk.protkey, | |
467 | walk->dst.virt.addr, walk->src.virt.addr, | |
468 | n, ctrptr); | |
469 | if (k) { | |
470 | if (ctrptr == ctrblk) | |
471 | memcpy(walk->iv, ctrptr + k - AES_BLOCK_SIZE, | |
472 | AES_BLOCK_SIZE); | |
473 | crypto_inc(walk->iv, AES_BLOCK_SIZE); | |
474 | ret = blkcipher_walk_done(desc, walk, nbytes - n); | |
475 | } | |
476 | if (k < n) { | |
e7c95eff MS |
477 | if (__ctr_paes_set_key(ctx) != 0) { |
478 | if (locked) | |
479 | spin_unlock(&ctrblk_lock); | |
27937843 | 480 | return blkcipher_walk_done(desc, walk, -EIO); |
e7c95eff | 481 | } |
27937843 MS |
482 | } |
483 | } | |
484 | if (locked) | |
485 | spin_unlock(&ctrblk_lock); | |
486 | /* | |
487 | * final block may be < AES_BLOCK_SIZE, copy only nbytes | |
488 | */ | |
489 | if (nbytes) { | |
490 | while (1) { | |
491 | if (cpacf_kmctr(ctx->fc | modifier, | |
492 | ctx->pk.protkey, buf, | |
493 | walk->src.virt.addr, AES_BLOCK_SIZE, | |
494 | walk->iv) == AES_BLOCK_SIZE) | |
495 | break; | |
496 | if (__ctr_paes_set_key(ctx) != 0) | |
497 | return blkcipher_walk_done(desc, walk, -EIO); | |
498 | } | |
499 | memcpy(walk->dst.virt.addr, buf, nbytes); | |
500 | crypto_inc(walk->iv, AES_BLOCK_SIZE); | |
501 | ret = blkcipher_walk_done(desc, walk, 0); | |
502 | } | |
503 | ||
504 | return ret; | |
505 | } | |
506 | ||
507 | static int ctr_paes_encrypt(struct blkcipher_desc *desc, | |
508 | struct scatterlist *dst, struct scatterlist *src, | |
509 | unsigned int nbytes) | |
510 | { | |
511 | struct blkcipher_walk walk; | |
512 | ||
513 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
514 | return ctr_paes_crypt(desc, 0, &walk); | |
515 | } | |
516 | ||
517 | static int ctr_paes_decrypt(struct blkcipher_desc *desc, | |
518 | struct scatterlist *dst, struct scatterlist *src, | |
519 | unsigned int nbytes) | |
520 | { | |
521 | struct blkcipher_walk walk; | |
522 | ||
523 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
524 | return ctr_paes_crypt(desc, CPACF_DECRYPT, &walk); | |
525 | } | |
526 | ||
527 | static struct crypto_alg ctr_paes_alg = { | |
528 | .cra_name = "ctr(paes)", | |
529 | .cra_driver_name = "ctr-paes-s390", | |
530 | .cra_priority = 400, /* combo: aes + ctr */ | |
531 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
532 | .cra_blocksize = 1, | |
533 | .cra_ctxsize = sizeof(struct s390_paes_ctx), | |
534 | .cra_type = &crypto_blkcipher_type, | |
535 | .cra_module = THIS_MODULE, | |
536 | .cra_list = LIST_HEAD_INIT(ctr_paes_alg.cra_list), | |
537 | .cra_u = { | |
538 | .blkcipher = { | |
539 | .min_keysize = SECKEYBLOBSIZE, | |
540 | .max_keysize = SECKEYBLOBSIZE, | |
541 | .ivsize = AES_BLOCK_SIZE, | |
542 | .setkey = ctr_paes_set_key, | |
543 | .encrypt = ctr_paes_encrypt, | |
544 | .decrypt = ctr_paes_decrypt, | |
545 | } | |
546 | } | |
547 | }; | |
548 | ||
549 | static inline void __crypto_unregister_alg(struct crypto_alg *alg) | |
550 | { | |
551 | if (!list_empty(&alg->cra_list)) | |
552 | crypto_unregister_alg(alg); | |
553 | } | |
554 | ||
555 | static void paes_s390_fini(void) | |
556 | { | |
557 | if (ctrblk) | |
558 | free_page((unsigned long) ctrblk); | |
559 | __crypto_unregister_alg(&ctr_paes_alg); | |
560 | __crypto_unregister_alg(&xts_paes_alg); | |
561 | __crypto_unregister_alg(&cbc_paes_alg); | |
562 | __crypto_unregister_alg(&ecb_paes_alg); | |
563 | } | |
564 | ||
565 | static int __init paes_s390_init(void) | |
566 | { | |
567 | int ret; | |
568 | ||
569 | /* Query available functions for KM, KMC and KMCTR */ | |
570 | cpacf_query(CPACF_KM, &km_functions); | |
571 | cpacf_query(CPACF_KMC, &kmc_functions); | |
572 | cpacf_query(CPACF_KMCTR, &kmctr_functions); | |
573 | ||
574 | if (cpacf_test_func(&km_functions, CPACF_KM_PAES_128) || | |
575 | cpacf_test_func(&km_functions, CPACF_KM_PAES_192) || | |
576 | cpacf_test_func(&km_functions, CPACF_KM_PAES_256)) { | |
577 | ret = crypto_register_alg(&ecb_paes_alg); | |
578 | if (ret) | |
579 | goto out_err; | |
580 | } | |
581 | ||
582 | if (cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) || | |
583 | cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) || | |
584 | cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256)) { | |
585 | ret = crypto_register_alg(&cbc_paes_alg); | |
586 | if (ret) | |
587 | goto out_err; | |
588 | } | |
589 | ||
590 | if (cpacf_test_func(&km_functions, CPACF_KM_PXTS_128) || | |
591 | cpacf_test_func(&km_functions, CPACF_KM_PXTS_256)) { | |
592 | ret = crypto_register_alg(&xts_paes_alg); | |
593 | if (ret) | |
594 | goto out_err; | |
595 | } | |
596 | ||
597 | if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) || | |
598 | cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) || | |
599 | cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) { | |
600 | ret = crypto_register_alg(&ctr_paes_alg); | |
601 | if (ret) | |
602 | goto out_err; | |
603 | ctrblk = (u8 *) __get_free_page(GFP_KERNEL); | |
604 | if (!ctrblk) { | |
605 | ret = -ENOMEM; | |
606 | goto out_err; | |
607 | } | |
608 | } | |
609 | ||
610 | return 0; | |
611 | out_err: | |
612 | paes_s390_fini(); | |
613 | return ret; | |
614 | } | |
615 | ||
616 | module_init(paes_s390_init); | |
617 | module_exit(paes_s390_fini); | |
618 | ||
619 | MODULE_ALIAS_CRYPTO("aes-all"); | |
620 | ||
621 | MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm with protected keys"); | |
622 | MODULE_LICENSE("GPL"); |