Blame view
crypto/ablkcipher.c
10.4 KB
2874c5fd2 treewide: Replace... |
1 |
// SPDX-License-Identifier: GPL-2.0-or-later |
b5b7f0886 [CRYPTO] api: Add... |
2 3 |
/* * Asynchronous block chaining cipher operations. |
c4ede64a6 crypto: ablkciphe... |
4 |
* |
b5b7f0886 [CRYPTO] api: Add... |
5 6 7 8 |
* This is the asynchronous version of blkcipher.c indicating completion * via a callback. * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
b5b7f0886 [CRYPTO] api: Add... |
9 |
*/ |
378f4f51f [CRYPTO] skcipher... |
10 11 |
#include <crypto/internal/skcipher.h> #include <linux/err.h> |
791b4d5f7 [CRYPTO] api: Add... |
12 |
#include <linux/kernel.h> |
791b4d5f7 [CRYPTO] api: Add... |
13 |
#include <linux/slab.h> |
b5b7f0886 [CRYPTO] api: Add... |
14 |
#include <linux/seq_file.h> |
29ffc8764 crypto: Add users... |
15 |
#include <linux/cryptouser.h> |
d8c34b949 crypto: Replaced ... |
16 |
#include <linux/compiler.h> |
29ffc8764 crypto: Add users... |
17 |
#include <net/netlink.h> |
b5b7f0886 [CRYPTO] api: Add... |
18 |
|
bf06099db crypto: skcipher ... |
19 |
#include <crypto/scatterwalk.h> |
378f4f51f [CRYPTO] skcipher... |
20 |
#include "internal.h" |
bf06099db crypto: skcipher ... |
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 |
struct ablkcipher_buffer { struct list_head entry; struct scatter_walk dst; unsigned int len; void *data; }; enum { ABLKCIPHER_WALK_SLOW = 1 << 0, }; static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p) { scatterwalk_copychunks(p->data, &p->dst, p->len, 1); } void __ablkcipher_walk_complete(struct ablkcipher_walk *walk) { struct ablkcipher_buffer *p, *tmp; list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { ablkcipher_buffer_write(p); list_del(&p->entry); kfree(p); } } EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete); static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk, struct ablkcipher_buffer *p) { p->dst = walk->out; list_add_tail(&p->entry, &walk->buffers); } /* Get a spot of the specified length that does not straddle a page. * The caller needs to ensure that there is enough space for this operation. */ static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len) { u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
a861afbc9 crypto: ablkciphe... |
62 |
|
bf06099db crypto: skcipher ... |
63 64 |
return max(start, end_page); } |
318abdfbe crypto: ablkciphe... |
65 66 |
static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk, unsigned int n) |
bf06099db crypto: skcipher ... |
67 |
{ |
bf06099db crypto: skcipher ... |
68 69 70 71 72 73 74 75 76 |
for (;;) { unsigned int len_this_page = scatterwalk_pagelen(&walk->out); if (len_this_page > n) len_this_page = n; scatterwalk_advance(&walk->out, n); if (n == len_this_page) break; n -= len_this_page; |
5be4d4c94 crypto: replace s... |
77 |
scatterwalk_start(&walk->out, sg_next(walk->out.sg)); |
bf06099db crypto: skcipher ... |
78 |
} |
bf06099db crypto: skcipher ... |
79 |
} |
318abdfbe crypto: ablkciphe... |
80 81 |
static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk, unsigned int n) |
bf06099db crypto: skcipher ... |
82 83 84 |
{ scatterwalk_advance(&walk->in, n); scatterwalk_advance(&walk->out, n); |
bf06099db crypto: skcipher ... |
85 86 87 88 89 90 91 92 93 |
} static int ablkcipher_walk_next(struct ablkcipher_request *req, struct ablkcipher_walk *walk); int ablkcipher_walk_done(struct ablkcipher_request *req, struct ablkcipher_walk *walk, int err) { struct crypto_tfm *tfm = req->base.tfm; |
318abdfbe crypto: ablkciphe... |
94 95 |
unsigned int n; /* bytes processed */ bool more; |
bf06099db crypto: skcipher ... |
96 |
|
318abdfbe crypto: ablkciphe... |
97 98 |
if (unlikely(err < 0)) goto finish; |
bf06099db crypto: skcipher ... |
99 |
|
318abdfbe crypto: ablkciphe... |
100 101 102 |
n = walk->nbytes - err; walk->total -= n; more = (walk->total != 0); |
bf06099db crypto: skcipher ... |
103 |
|
318abdfbe crypto: ablkciphe... |
104 105 106 107 108 109 110 111 112 |
if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) { ablkcipher_done_fast(walk, n); } else { if (WARN_ON(err)) { /* unexpected case; didn't process all bytes */ err = -EINVAL; goto finish; } ablkcipher_done_slow(walk, n); |
bf06099db crypto: skcipher ... |
113 |
} |
318abdfbe crypto: ablkciphe... |
114 115 |
scatterwalk_done(&walk->in, 0, more); scatterwalk_done(&walk->out, 1, more); |
bf06099db crypto: skcipher ... |
116 |
|
318abdfbe crypto: ablkciphe... |
117 |
if (more) { |
bf06099db crypto: skcipher ... |
118 119 120 |
crypto_yield(req->base.flags); return ablkcipher_walk_next(req, walk); } |
318abdfbe crypto: ablkciphe... |
121 122 123 |
err = 0; finish: walk->nbytes = 0; |
bf06099db crypto: skcipher ... |
124 125 |
if (walk->iv != req->info) memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize); |
33c7c0fb2 crypto: skcipher ... |
126 |
kfree(walk->iv_buffer); |
bf06099db crypto: skcipher ... |
127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 |
return err; } EXPORT_SYMBOL_GPL(ablkcipher_walk_done); static inline int ablkcipher_next_slow(struct ablkcipher_request *req, struct ablkcipher_walk *walk, unsigned int bsize, unsigned int alignmask, void **src_p, void **dst_p) { unsigned aligned_bsize = ALIGN(bsize, alignmask + 1); struct ablkcipher_buffer *p; void *src, *dst, *base; unsigned int n; n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1); n += (aligned_bsize * 3 - (alignmask + 1) + (alignmask & ~(crypto_tfm_ctx_alignment() - 1))); p = kmalloc(n, GFP_ATOMIC); if (!p) |
2716fbf63 crypto: skcipher ... |
148 |
return ablkcipher_walk_done(req, walk, -ENOMEM); |
bf06099db crypto: skcipher ... |
149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 |
base = p + 1; dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1); src = dst = ablkcipher_get_spot(dst, bsize); p->len = bsize; p->data = dst; scatterwalk_copychunks(src, &walk->in, bsize, 0); ablkcipher_queue_write(walk, p); walk->nbytes = bsize; walk->flags |= ABLKCIPHER_WALK_SLOW; *src_p = src; *dst_p = dst; return 0; } static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk, struct crypto_tfm *tfm, unsigned int alignmask) { unsigned bs = walk->blocksize; unsigned int ivsize = tfm->crt_ablkcipher.ivsize; unsigned aligned_bs = ALIGN(bs, alignmask + 1); unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) - (alignmask + 1); u8 *iv; size += alignmask & ~(crypto_tfm_ctx_alignment() - 1); walk->iv_buffer = kmalloc(size, GFP_ATOMIC); if (!walk->iv_buffer) return -ENOMEM; iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1); iv = ablkcipher_get_spot(iv, bs) + aligned_bs; iv = ablkcipher_get_spot(iv, bs) + aligned_bs; iv = ablkcipher_get_spot(iv, ivsize); walk->iv = memcpy(iv, walk->iv, ivsize); return 0; } static inline int ablkcipher_next_fast(struct ablkcipher_request *req, struct ablkcipher_walk *walk) { walk->src.page = scatterwalk_page(&walk->in); walk->src.offset = offset_in_page(walk->in.offset); walk->dst.page = scatterwalk_page(&walk->out); walk->dst.offset = offset_in_page(walk->out.offset); return 0; } static int ablkcipher_walk_next(struct ablkcipher_request *req, struct ablkcipher_walk *walk) { struct crypto_tfm *tfm = req->base.tfm; unsigned int alignmask, bsize, n; void *src, *dst; int err; alignmask = crypto_tfm_alg_alignmask(tfm); n = walk->total; if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) { req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN; return ablkcipher_walk_done(req, walk, -EINVAL); } walk->flags &= ~ABLKCIPHER_WALK_SLOW; src = dst = NULL; bsize = min(walk->blocksize, n); n = scatterwalk_clamp(&walk->in, n); n = scatterwalk_clamp(&walk->out, n); if (n < bsize || !scatterwalk_aligned(&walk->in, alignmask) || !scatterwalk_aligned(&walk->out, alignmask)) { err = ablkcipher_next_slow(req, walk, bsize, alignmask, &src, &dst); goto set_phys_lowmem; } walk->nbytes = n; return ablkcipher_next_fast(req, walk); set_phys_lowmem: if (err >= 0) { walk->src.page = virt_to_page(src); walk->dst.page = virt_to_page(dst); walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1)); walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1)); } return err; } static int ablkcipher_walk_first(struct ablkcipher_request *req, struct ablkcipher_walk *walk) { struct crypto_tfm *tfm = req->base.tfm; unsigned int alignmask; alignmask = crypto_tfm_alg_alignmask(tfm); if (WARN_ON_ONCE(in_irq())) return -EDEADLK; |
70d906bc1 crypto: skcipher ... |
261 |
walk->iv = req->info; |
bf06099db crypto: skcipher ... |
262 263 264 265 266 |
walk->nbytes = walk->total; if (unlikely(!walk->total)) return 0; walk->iv_buffer = NULL; |
bf06099db crypto: skcipher ... |
267 268 |
if (unlikely(((unsigned long)walk->iv & alignmask))) { int err = ablkcipher_copy_iv(walk, tfm, alignmask); |
a861afbc9 crypto: ablkciphe... |
269 |
|
bf06099db crypto: skcipher ... |
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 |
if (err) return err; } scatterwalk_start(&walk->in, walk->in.sg); scatterwalk_start(&walk->out, walk->out.sg); return ablkcipher_walk_next(req, walk); } int ablkcipher_walk_phys(struct ablkcipher_request *req, struct ablkcipher_walk *walk) { walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm); return ablkcipher_walk_first(req, walk); } EXPORT_SYMBOL_GPL(ablkcipher_walk_phys); |
791b4d5f7 [CRYPTO] api: Add... |
287 288 |
static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen) |
ca7c39385 [CRYPTO] api: Han... |
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 |
{ struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); int ret; u8 *buffer, *alignbuffer; unsigned long absize; absize = keylen + alignmask; buffer = kmalloc(absize, GFP_ATOMIC); if (!buffer) return -ENOMEM; alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); memcpy(alignbuffer, key, keylen); ret = cipher->setkey(tfm, alignbuffer, keylen); |
068171767 [CRYPTO] api: fix... |
304 |
memset(alignbuffer, 0, keylen); |
ca7c39385 [CRYPTO] api: Han... |
305 306 307 |
kfree(buffer); return ret; } |
b5b7f0886 [CRYPTO] api: Add... |
308 309 310 311 |
static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen) { struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); |
ca7c39385 [CRYPTO] api: Han... |
312 |
unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); |
b5b7f0886 [CRYPTO] api: Add... |
313 314 315 316 317 |
if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); return -EINVAL; } |
ca7c39385 [CRYPTO] api: Han... |
318 319 |
if ((unsigned long)key & alignmask) return setkey_unaligned(tfm, key, keylen); |
b5b7f0886 [CRYPTO] api: Add... |
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 |
return cipher->setkey(tfm, key, keylen); } static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) { return alg->cra_ctxsize; } static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) { struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; if (alg->ivsize > PAGE_SIZE / 8) return -EINVAL; crt->setkey = setkey; crt->encrypt = alg->encrypt; crt->decrypt = alg->decrypt; |
ecfc43292 [CRYPTO] skcipher... |
341 |
crt->base = __crypto_ablkcipher_cast(tfm); |
b5b7f0886 [CRYPTO] api: Add... |
342 343 344 345 |
crt->ivsize = alg->ivsize; return 0; } |
3acc84739 crypto: algapi - ... |
346 |
#ifdef CONFIG_NET |
29ffc8764 crypto: Add users... |
347 348 349 |
static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) { struct crypto_report_blkcipher rblkcipher; |
37db69e0b crypto: user - cl... |
350 351 352 |
memset(&rblkcipher, 0, sizeof(rblkcipher)); strscpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type)); |
c79b411ea crypto: skcipher ... |
353 |
strscpy(rblkcipher.geniv, "<default>", sizeof(rblkcipher.geniv)); |
29ffc8764 crypto: Add users... |
354 355 356 357 358 |
rblkcipher.blocksize = alg->cra_blocksize; rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize; rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize; rblkcipher.ivsize = alg->cra_ablkcipher.ivsize; |
37db69e0b crypto: user - cl... |
359 360 |
return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, sizeof(rblkcipher), &rblkcipher); |
29ffc8764 crypto: Add users... |
361 |
} |
3acc84739 crypto: algapi - ... |
362 363 364 365 366 367 |
#else static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg) { return -ENOSYS; } #endif |
29ffc8764 crypto: Add users... |
368 |
|
b5b7f0886 [CRYPTO] api: Add... |
369 |
static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) |
d8c34b949 crypto: Replaced ... |
370 |
__maybe_unused; |
b5b7f0886 [CRYPTO] api: Add... |
371 372 373 374 375 376 |
static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) { struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; seq_printf(m, "type : ablkcipher "); |
189ed66e9 [CRYPTO] api: Sho... |
377 378 379 |
seq_printf(m, "async : %s ", alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); |
b5b7f0886 [CRYPTO] api: Add... |
380 381 382 383 384 385 386 387 |
seq_printf(m, "blocksize : %u ", alg->cra_blocksize); seq_printf(m, "min keysize : %u ", ablkcipher->min_keysize); seq_printf(m, "max keysize : %u ", ablkcipher->max_keysize); seq_printf(m, "ivsize : %u ", ablkcipher->ivsize); |
c79b411ea crypto: skcipher ... |
388 389 |
seq_printf(m, "geniv : <default> "); |
b5b7f0886 [CRYPTO] api: Add... |
390 391 392 393 394 395 396 397 |
} const struct crypto_type crypto_ablkcipher_type = { .ctxsize = crypto_ablkcipher_ctxsize, .init = crypto_init_ablkcipher_ops, #ifdef CONFIG_PROC_FS .show = crypto_ablkcipher_show, #endif |
29ffc8764 crypto: Add users... |
398 |
.report = crypto_ablkcipher_report, |
b5b7f0886 [CRYPTO] api: Add... |
399 400 |
}; EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); |