Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 2 | /* |
| 3 | * Symmetric key cipher operations. |
| 4 | * |
| 5 | * Generic encrypt/decrypt wrapper for ciphers, handles operations across |
| 6 | * multiple page boundaries by using temporary blocks. In user context, |
| 7 | * the kernel is given a chance to schedule us once per page. |
| 8 | * |
| 9 | * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 10 | */ |
| 11 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 12 | #include <crypto/internal/aead.h> |
Ard Biesheuvel | 0eb76ba | 2020-12-11 13:27:15 +0100 | [diff] [blame] | 13 | #include <crypto/internal/cipher.h> |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 14 | #include <crypto/internal/skcipher.h> |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 15 | #include <crypto/scatterwalk.h> |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 16 | #include <linux/bug.h> |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 17 | #include <linux/cryptouser.h> |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 18 | #include <linux/err.h> |
| 19 | #include <linux/kernel.h> |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 20 | #include <linux/list.h> |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 21 | #include <linux/mm.h> |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 22 | #include <linux/module.h> |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 23 | #include <linux/seq_file.h> |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 24 | #include <linux/slab.h> |
| 25 | #include <linux/string.h> |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 26 | #include <net/netlink.h> |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 27 | #include "skcipher.h" |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 28 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 29 | #define CRYPTO_ALG_TYPE_SKCIPHER_MASK 0x0000000e |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 30 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 31 | enum { |
| 32 | SKCIPHER_WALK_PHYS = 1 << 0, |
| 33 | SKCIPHER_WALK_SLOW = 1 << 1, |
| 34 | SKCIPHER_WALK_COPY = 1 << 2, |
| 35 | SKCIPHER_WALK_DIFF = 1 << 3, |
| 36 | SKCIPHER_WALK_SLEEP = 1 << 4, |
| 37 | }; |
| 38 | |
| 39 | struct skcipher_walk_buffer { |
| 40 | struct list_head entry; |
| 41 | struct scatter_walk dst; |
| 42 | unsigned int len; |
| 43 | u8 *data; |
| 44 | u8 buffer[]; |
| 45 | }; |
| 46 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 47 | static const struct crypto_type crypto_skcipher_type; |
| 48 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 49 | static int skcipher_walk_next(struct skcipher_walk *walk); |
| 50 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 51 | static inline void skcipher_map_src(struct skcipher_walk *walk) |
| 52 | { |
Ard Biesheuvel | d07bd95 | 2023-01-02 11:18:46 +0100 | [diff] [blame] | 53 | walk->src.virt.addr = scatterwalk_map(&walk->in); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 54 | } |
| 55 | |
| 56 | static inline void skcipher_map_dst(struct skcipher_walk *walk) |
| 57 | { |
Ard Biesheuvel | d07bd95 | 2023-01-02 11:18:46 +0100 | [diff] [blame] | 58 | walk->dst.virt.addr = scatterwalk_map(&walk->out); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | static inline void skcipher_unmap_src(struct skcipher_walk *walk) |
| 62 | { |
Ard Biesheuvel | d07bd95 | 2023-01-02 11:18:46 +0100 | [diff] [blame] | 63 | scatterwalk_unmap(walk->src.virt.addr); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | static inline void skcipher_unmap_dst(struct skcipher_walk *walk) |
| 67 | { |
Ard Biesheuvel | d07bd95 | 2023-01-02 11:18:46 +0100 | [diff] [blame] | 68 | scatterwalk_unmap(walk->dst.virt.addr); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | static inline gfp_t skcipher_walk_gfp(struct skcipher_walk *walk) |
| 72 | { |
| 73 | return walk->flags & SKCIPHER_WALK_SLEEP ? GFP_KERNEL : GFP_ATOMIC; |
| 74 | } |
| 75 | |
| 76 | /* Get a spot of the specified length that does not straddle a page. |
| 77 | * The caller needs to ensure that there is enough space for this operation. |
| 78 | */ |
| 79 | static inline u8 *skcipher_get_spot(u8 *start, unsigned int len) |
| 80 | { |
| 81 | u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK); |
| 82 | |
| 83 | return max(start, end_page); |
| 84 | } |
| 85 | |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 86 | static inline struct skcipher_alg *__crypto_skcipher_alg( |
| 87 | struct crypto_alg *alg) |
| 88 | { |
| 89 | return container_of(alg, struct skcipher_alg, base); |
| 90 | } |
| 91 | |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 92 | static int skcipher_done_slow(struct skcipher_walk *walk, unsigned int bsize) |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 93 | { |
| 94 | u8 *addr; |
| 95 | |
| 96 | addr = (u8 *)ALIGN((unsigned long)walk->buffer, walk->alignmask + 1); |
| 97 | addr = skcipher_get_spot(addr, bsize); |
| 98 | scatterwalk_copychunks(addr, &walk->out, bsize, |
| 99 | (walk->flags & SKCIPHER_WALK_PHYS) ? 2 : 1); |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 100 | return 0; |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | int skcipher_walk_done(struct skcipher_walk *walk, int err) |
| 104 | { |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 105 | unsigned int n = walk->nbytes; |
| 106 | unsigned int nbytes = 0; |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 107 | |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 108 | if (!n) |
Eric Biggers | 8088d3d | 2018-07-23 10:54:56 -0700 | [diff] [blame] | 109 | goto finish; |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 110 | |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 111 | if (likely(err >= 0)) { |
| 112 | n -= err; |
| 113 | nbytes = walk->total - n; |
| 114 | } |
Eric Biggers | 8088d3d | 2018-07-23 10:54:56 -0700 | [diff] [blame] | 115 | |
| 116 | if (likely(!(walk->flags & (SKCIPHER_WALK_PHYS | |
| 117 | SKCIPHER_WALK_SLOW | |
| 118 | SKCIPHER_WALK_COPY | |
| 119 | SKCIPHER_WALK_DIFF)))) { |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 120 | unmap_src: |
| 121 | skcipher_unmap_src(walk); |
| 122 | } else if (walk->flags & SKCIPHER_WALK_DIFF) { |
| 123 | skcipher_unmap_dst(walk); |
| 124 | goto unmap_src; |
| 125 | } else if (walk->flags & SKCIPHER_WALK_COPY) { |
| 126 | skcipher_map_dst(walk); |
| 127 | memcpy(walk->dst.virt.addr, walk->page, n); |
| 128 | skcipher_unmap_dst(walk); |
| 129 | } else if (unlikely(walk->flags & SKCIPHER_WALK_SLOW)) { |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 130 | if (err > 0) { |
Eric Biggers | dcaca01 | 2019-03-31 13:04:15 -0700 | [diff] [blame] | 131 | /* |
| 132 | * Didn't process all bytes. Either the algorithm is |
| 133 | * broken, or this was the last step and it turned out |
| 134 | * the message wasn't evenly divisible into blocks but |
| 135 | * the algorithm requires it. |
| 136 | */ |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 137 | err = -EINVAL; |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 138 | nbytes = 0; |
| 139 | } else |
| 140 | n = skcipher_done_slow(walk, n); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 141 | } |
| 142 | |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 143 | if (err > 0) |
| 144 | err = 0; |
| 145 | |
| 146 | walk->total = nbytes; |
| 147 | walk->nbytes = 0; |
| 148 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 149 | scatterwalk_advance(&walk->in, n); |
| 150 | scatterwalk_advance(&walk->out, n); |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 151 | scatterwalk_done(&walk->in, 0, nbytes); |
| 152 | scatterwalk_done(&walk->out, 1, nbytes); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 153 | |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 154 | if (nbytes) { |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 155 | crypto_yield(walk->flags & SKCIPHER_WALK_SLEEP ? |
| 156 | CRYPTO_TFM_REQ_MAY_SLEEP : 0); |
| 157 | return skcipher_walk_next(walk); |
| 158 | } |
| 159 | |
Herbert Xu | 0ba3c02 | 2019-09-06 13:13:06 +1000 | [diff] [blame] | 160 | finish: |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 161 | /* Short-circuit for the common/fast path. */ |
| 162 | if (!((unsigned long)walk->buffer | (unsigned long)walk->page)) |
| 163 | goto out; |
| 164 | |
| 165 | if (walk->flags & SKCIPHER_WALK_PHYS) |
| 166 | goto out; |
| 167 | |
| 168 | if (walk->iv != walk->oiv) |
| 169 | memcpy(walk->oiv, walk->iv, walk->ivsize); |
| 170 | if (walk->buffer != walk->page) |
| 171 | kfree(walk->buffer); |
| 172 | if (walk->page) |
| 173 | free_page((unsigned long)walk->page); |
| 174 | |
| 175 | out: |
| 176 | return err; |
| 177 | } |
| 178 | EXPORT_SYMBOL_GPL(skcipher_walk_done); |
| 179 | |
| 180 | void skcipher_walk_complete(struct skcipher_walk *walk, int err) |
| 181 | { |
| 182 | struct skcipher_walk_buffer *p, *tmp; |
| 183 | |
| 184 | list_for_each_entry_safe(p, tmp, &walk->buffers, entry) { |
| 185 | u8 *data; |
| 186 | |
| 187 | if (err) |
| 188 | goto done; |
| 189 | |
| 190 | data = p->data; |
| 191 | if (!data) { |
| 192 | data = PTR_ALIGN(&p->buffer[0], walk->alignmask + 1); |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 193 | data = skcipher_get_spot(data, walk->stride); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | scatterwalk_copychunks(data, &p->dst, p->len, 1); |
| 197 | |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 198 | if (offset_in_page(p->data) + p->len + walk->stride > |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 199 | PAGE_SIZE) |
| 200 | free_page((unsigned long)p->data); |
| 201 | |
| 202 | done: |
| 203 | list_del(&p->entry); |
| 204 | kfree(p); |
| 205 | } |
| 206 | |
| 207 | if (!err && walk->iv != walk->oiv) |
| 208 | memcpy(walk->oiv, walk->iv, walk->ivsize); |
| 209 | if (walk->buffer != walk->page) |
| 210 | kfree(walk->buffer); |
| 211 | if (walk->page) |
| 212 | free_page((unsigned long)walk->page); |
| 213 | } |
| 214 | EXPORT_SYMBOL_GPL(skcipher_walk_complete); |
| 215 | |
| 216 | static void skcipher_queue_write(struct skcipher_walk *walk, |
| 217 | struct skcipher_walk_buffer *p) |
| 218 | { |
| 219 | p->dst = walk->out; |
| 220 | list_add_tail(&p->entry, &walk->buffers); |
| 221 | } |
| 222 | |
| 223 | static int skcipher_next_slow(struct skcipher_walk *walk, unsigned int bsize) |
| 224 | { |
| 225 | bool phys = walk->flags & SKCIPHER_WALK_PHYS; |
| 226 | unsigned alignmask = walk->alignmask; |
| 227 | struct skcipher_walk_buffer *p; |
| 228 | unsigned a; |
| 229 | unsigned n; |
| 230 | u8 *buffer; |
| 231 | void *v; |
| 232 | |
| 233 | if (!phys) { |
Ard Biesheuvel | 18e615a | 2016-12-13 13:34:02 +0000 | [diff] [blame] | 234 | if (!walk->buffer) |
| 235 | walk->buffer = walk->page; |
| 236 | buffer = walk->buffer; |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 237 | if (buffer) |
| 238 | goto ok; |
| 239 | } |
| 240 | |
| 241 | /* Start with the minimum alignment of kmalloc. */ |
| 242 | a = crypto_tfm_ctx_alignment() - 1; |
| 243 | n = bsize; |
| 244 | |
| 245 | if (phys) { |
| 246 | /* Calculate the minimum alignment of p->buffer. */ |
| 247 | a &= (sizeof(*p) ^ (sizeof(*p) - 1)) >> 1; |
| 248 | n += sizeof(*p); |
| 249 | } |
| 250 | |
| 251 | /* Minimum size to align p->buffer by alignmask. */ |
| 252 | n += alignmask & ~a; |
| 253 | |
| 254 | /* Minimum size to ensure p->buffer does not straddle a page. */ |
| 255 | n += (bsize - 1) & ~(alignmask | a); |
| 256 | |
| 257 | v = kzalloc(n, skcipher_walk_gfp(walk)); |
| 258 | if (!v) |
| 259 | return skcipher_walk_done(walk, -ENOMEM); |
| 260 | |
| 261 | if (phys) { |
| 262 | p = v; |
| 263 | p->len = bsize; |
| 264 | skcipher_queue_write(walk, p); |
| 265 | buffer = p->buffer; |
| 266 | } else { |
| 267 | walk->buffer = v; |
| 268 | buffer = v; |
| 269 | } |
| 270 | |
| 271 | ok: |
| 272 | walk->dst.virt.addr = PTR_ALIGN(buffer, alignmask + 1); |
| 273 | walk->dst.virt.addr = skcipher_get_spot(walk->dst.virt.addr, bsize); |
| 274 | walk->src.virt.addr = walk->dst.virt.addr; |
| 275 | |
| 276 | scatterwalk_copychunks(walk->src.virt.addr, &walk->in, bsize, 0); |
| 277 | |
| 278 | walk->nbytes = bsize; |
| 279 | walk->flags |= SKCIPHER_WALK_SLOW; |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static int skcipher_next_copy(struct skcipher_walk *walk) |
| 285 | { |
| 286 | struct skcipher_walk_buffer *p; |
| 287 | u8 *tmp = walk->page; |
| 288 | |
| 289 | skcipher_map_src(walk); |
| 290 | memcpy(tmp, walk->src.virt.addr, walk->nbytes); |
| 291 | skcipher_unmap_src(walk); |
| 292 | |
| 293 | walk->src.virt.addr = tmp; |
| 294 | walk->dst.virt.addr = tmp; |
| 295 | |
| 296 | if (!(walk->flags & SKCIPHER_WALK_PHYS)) |
| 297 | return 0; |
| 298 | |
| 299 | p = kmalloc(sizeof(*p), skcipher_walk_gfp(walk)); |
| 300 | if (!p) |
| 301 | return -ENOMEM; |
| 302 | |
| 303 | p->data = walk->page; |
| 304 | p->len = walk->nbytes; |
| 305 | skcipher_queue_write(walk, p); |
| 306 | |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 307 | if (offset_in_page(walk->page) + walk->nbytes + walk->stride > |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 308 | PAGE_SIZE) |
| 309 | walk->page = NULL; |
| 310 | else |
| 311 | walk->page += walk->nbytes; |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | static int skcipher_next_fast(struct skcipher_walk *walk) |
| 317 | { |
| 318 | unsigned long diff; |
| 319 | |
| 320 | walk->src.phys.page = scatterwalk_page(&walk->in); |
| 321 | walk->src.phys.offset = offset_in_page(walk->in.offset); |
| 322 | walk->dst.phys.page = scatterwalk_page(&walk->out); |
| 323 | walk->dst.phys.offset = offset_in_page(walk->out.offset); |
| 324 | |
| 325 | if (walk->flags & SKCIPHER_WALK_PHYS) |
| 326 | return 0; |
| 327 | |
| 328 | diff = walk->src.phys.offset - walk->dst.phys.offset; |
| 329 | diff |= walk->src.virt.page - walk->dst.virt.page; |
| 330 | |
| 331 | skcipher_map_src(walk); |
| 332 | walk->dst.virt.addr = walk->src.virt.addr; |
| 333 | |
| 334 | if (diff) { |
| 335 | walk->flags |= SKCIPHER_WALK_DIFF; |
| 336 | skcipher_map_dst(walk); |
| 337 | } |
| 338 | |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | static int skcipher_walk_next(struct skcipher_walk *walk) |
| 343 | { |
| 344 | unsigned int bsize; |
| 345 | unsigned int n; |
| 346 | int err; |
| 347 | |
| 348 | walk->flags &= ~(SKCIPHER_WALK_SLOW | SKCIPHER_WALK_COPY | |
| 349 | SKCIPHER_WALK_DIFF); |
| 350 | |
| 351 | n = walk->total; |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 352 | bsize = min(walk->stride, max(n, walk->blocksize)); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 353 | n = scatterwalk_clamp(&walk->in, n); |
| 354 | n = scatterwalk_clamp(&walk->out, n); |
| 355 | |
| 356 | if (unlikely(n < bsize)) { |
| 357 | if (unlikely(walk->total < walk->blocksize)) |
| 358 | return skcipher_walk_done(walk, -EINVAL); |
| 359 | |
| 360 | slow_path: |
| 361 | err = skcipher_next_slow(walk, bsize); |
| 362 | goto set_phys_lowmem; |
| 363 | } |
| 364 | |
| 365 | if (unlikely((walk->in.offset | walk->out.offset) & walk->alignmask)) { |
| 366 | if (!walk->page) { |
| 367 | gfp_t gfp = skcipher_walk_gfp(walk); |
| 368 | |
| 369 | walk->page = (void *)__get_free_page(gfp); |
| 370 | if (!walk->page) |
| 371 | goto slow_path; |
| 372 | } |
| 373 | |
| 374 | walk->nbytes = min_t(unsigned, n, |
| 375 | PAGE_SIZE - offset_in_page(walk->page)); |
| 376 | walk->flags |= SKCIPHER_WALK_COPY; |
| 377 | err = skcipher_next_copy(walk); |
| 378 | goto set_phys_lowmem; |
| 379 | } |
| 380 | |
| 381 | walk->nbytes = n; |
| 382 | |
| 383 | return skcipher_next_fast(walk); |
| 384 | |
| 385 | set_phys_lowmem: |
| 386 | if (!err && (walk->flags & SKCIPHER_WALK_PHYS)) { |
| 387 | walk->src.phys.page = virt_to_page(walk->src.virt.addr); |
| 388 | walk->dst.phys.page = virt_to_page(walk->dst.virt.addr); |
| 389 | walk->src.phys.offset &= PAGE_SIZE - 1; |
| 390 | walk->dst.phys.offset &= PAGE_SIZE - 1; |
| 391 | } |
| 392 | return err; |
| 393 | } |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 394 | |
| 395 | static int skcipher_copy_iv(struct skcipher_walk *walk) |
| 396 | { |
| 397 | unsigned a = crypto_tfm_ctx_alignment() - 1; |
| 398 | unsigned alignmask = walk->alignmask; |
| 399 | unsigned ivsize = walk->ivsize; |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 400 | unsigned bs = walk->stride; |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 401 | unsigned aligned_bs; |
| 402 | unsigned size; |
| 403 | u8 *iv; |
| 404 | |
Eric Biggers | 0567fc9 | 2018-07-23 09:57:50 -0700 | [diff] [blame] | 405 | aligned_bs = ALIGN(bs, alignmask + 1); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 406 | |
| 407 | /* Minimum size to align buffer by alignmask. */ |
| 408 | size = alignmask & ~a; |
| 409 | |
| 410 | if (walk->flags & SKCIPHER_WALK_PHYS) |
| 411 | size += ivsize; |
| 412 | else { |
| 413 | size += aligned_bs + ivsize; |
| 414 | |
| 415 | /* Minimum size to ensure buffer does not straddle a page. */ |
| 416 | size += (bs - 1) & ~(alignmask | a); |
| 417 | } |
| 418 | |
| 419 | walk->buffer = kmalloc(size, skcipher_walk_gfp(walk)); |
| 420 | if (!walk->buffer) |
| 421 | return -ENOMEM; |
| 422 | |
| 423 | iv = PTR_ALIGN(walk->buffer, alignmask + 1); |
| 424 | iv = skcipher_get_spot(iv, bs) + aligned_bs; |
| 425 | |
| 426 | walk->iv = memcpy(iv, walk->iv, walk->ivsize); |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static int skcipher_walk_first(struct skcipher_walk *walk) |
| 431 | { |
Changbin Du | abfc7fa | 2021-08-14 09:11:14 +0800 | [diff] [blame] | 432 | if (WARN_ON_ONCE(in_hardirq())) |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 433 | return -EDEADLK; |
| 434 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 435 | walk->buffer = NULL; |
| 436 | if (unlikely(((unsigned long)walk->iv & walk->alignmask))) { |
| 437 | int err = skcipher_copy_iv(walk); |
| 438 | if (err) |
| 439 | return err; |
| 440 | } |
| 441 | |
| 442 | walk->page = NULL; |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 443 | |
| 444 | return skcipher_walk_next(walk); |
| 445 | } |
| 446 | |
| 447 | static int skcipher_walk_skcipher(struct skcipher_walk *walk, |
| 448 | struct skcipher_request *req) |
| 449 | { |
| 450 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 451 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 452 | |
Herbert Xu | 0cabf2a | 2017-10-07 11:29:48 +0800 | [diff] [blame] | 453 | walk->total = req->cryptlen; |
| 454 | walk->nbytes = 0; |
Eric Biggers | 2b4f27c | 2017-11-29 01:18:57 -0800 | [diff] [blame] | 455 | walk->iv = req->iv; |
| 456 | walk->oiv = req->iv; |
Herbert Xu | 0cabf2a | 2017-10-07 11:29:48 +0800 | [diff] [blame] | 457 | |
| 458 | if (unlikely(!walk->total)) |
| 459 | return 0; |
| 460 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 461 | scatterwalk_start(&walk->in, req->src); |
| 462 | scatterwalk_start(&walk->out, req->dst); |
| 463 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 464 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
| 465 | walk->flags |= req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ? |
| 466 | SKCIPHER_WALK_SLEEP : 0; |
| 467 | |
| 468 | walk->blocksize = crypto_skcipher_blocksize(tfm); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 469 | walk->ivsize = crypto_skcipher_ivsize(tfm); |
| 470 | walk->alignmask = crypto_skcipher_alignmask(tfm); |
| 471 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 472 | if (alg->co.base.cra_type != &crypto_skcipher_type) |
| 473 | walk->stride = alg->co.chunksize; |
| 474 | else |
| 475 | walk->stride = alg->walksize; |
| 476 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 477 | return skcipher_walk_first(walk); |
| 478 | } |
| 479 | |
| 480 | int skcipher_walk_virt(struct skcipher_walk *walk, |
| 481 | struct skcipher_request *req, bool atomic) |
| 482 | { |
| 483 | int err; |
| 484 | |
Eric Biggers | bb64829 | 2018-12-15 12:41:53 -0800 | [diff] [blame] | 485 | might_sleep_if(req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); |
| 486 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 487 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
| 488 | |
| 489 | err = skcipher_walk_skcipher(walk, req); |
| 490 | |
| 491 | walk->flags &= atomic ? ~SKCIPHER_WALK_SLEEP : ~0; |
| 492 | |
| 493 | return err; |
| 494 | } |
| 495 | EXPORT_SYMBOL_GPL(skcipher_walk_virt); |
| 496 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 497 | int skcipher_walk_async(struct skcipher_walk *walk, |
| 498 | struct skcipher_request *req) |
| 499 | { |
| 500 | walk->flags |= SKCIPHER_WALK_PHYS; |
| 501 | |
| 502 | INIT_LIST_HEAD(&walk->buffers); |
| 503 | |
| 504 | return skcipher_walk_skcipher(walk, req); |
| 505 | } |
| 506 | EXPORT_SYMBOL_GPL(skcipher_walk_async); |
| 507 | |
Herbert Xu | 34bc085 | 2016-11-30 21:14:07 +0800 | [diff] [blame] | 508 | static int skcipher_walk_aead_common(struct skcipher_walk *walk, |
| 509 | struct aead_request *req, bool atomic) |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 510 | { |
| 511 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| 512 | int err; |
| 513 | |
Herbert Xu | 0cabf2a | 2017-10-07 11:29:48 +0800 | [diff] [blame] | 514 | walk->nbytes = 0; |
Eric Biggers | 2b4f27c | 2017-11-29 01:18:57 -0800 | [diff] [blame] | 515 | walk->iv = req->iv; |
| 516 | walk->oiv = req->iv; |
Herbert Xu | 0cabf2a | 2017-10-07 11:29:48 +0800 | [diff] [blame] | 517 | |
| 518 | if (unlikely(!walk->total)) |
| 519 | return 0; |
| 520 | |
Ard Biesheuvel | 3cbf61f | 2016-11-29 13:05:31 +0000 | [diff] [blame] | 521 | walk->flags &= ~SKCIPHER_WALK_PHYS; |
| 522 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 523 | scatterwalk_start(&walk->in, req->src); |
| 524 | scatterwalk_start(&walk->out, req->dst); |
| 525 | |
| 526 | scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2); |
| 527 | scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2); |
| 528 | |
Ondrej Mosnáček | c14ca83 | 2017-11-23 13:49:06 +0100 | [diff] [blame] | 529 | scatterwalk_done(&walk->in, 0, walk->total); |
| 530 | scatterwalk_done(&walk->out, 0, walk->total); |
| 531 | |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 532 | if (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) |
| 533 | walk->flags |= SKCIPHER_WALK_SLEEP; |
| 534 | else |
| 535 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
| 536 | |
| 537 | walk->blocksize = crypto_aead_blocksize(tfm); |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 538 | walk->stride = crypto_aead_chunksize(tfm); |
Herbert Xu | b286d8b | 2016-11-22 20:08:12 +0800 | [diff] [blame] | 539 | walk->ivsize = crypto_aead_ivsize(tfm); |
| 540 | walk->alignmask = crypto_aead_alignmask(tfm); |
| 541 | |
| 542 | err = skcipher_walk_first(walk); |
| 543 | |
| 544 | if (atomic) |
| 545 | walk->flags &= ~SKCIPHER_WALK_SLEEP; |
| 546 | |
| 547 | return err; |
| 548 | } |
Herbert Xu | 34bc085 | 2016-11-30 21:14:07 +0800 | [diff] [blame] | 549 | |
Herbert Xu | 34bc085 | 2016-11-30 21:14:07 +0800 | [diff] [blame] | 550 | int skcipher_walk_aead_encrypt(struct skcipher_walk *walk, |
| 551 | struct aead_request *req, bool atomic) |
| 552 | { |
| 553 | walk->total = req->cryptlen; |
| 554 | |
| 555 | return skcipher_walk_aead_common(walk, req, atomic); |
| 556 | } |
| 557 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_encrypt); |
| 558 | |
| 559 | int skcipher_walk_aead_decrypt(struct skcipher_walk *walk, |
| 560 | struct aead_request *req, bool atomic) |
| 561 | { |
| 562 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
| 563 | |
| 564 | walk->total = req->cryptlen - crypto_aead_authsize(tfm); |
| 565 | |
| 566 | return skcipher_walk_aead_common(walk, req, atomic); |
| 567 | } |
| 568 | EXPORT_SYMBOL_GPL(skcipher_walk_aead_decrypt); |
| 569 | |
Eric Biggers | b1f6b4b | 2019-01-06 18:47:43 -0800 | [diff] [blame] | 570 | static void skcipher_set_needkey(struct crypto_skcipher *tfm) |
| 571 | { |
Eric Biggers | 9ac0d13 | 2019-11-29 10:23:04 -0800 | [diff] [blame] | 572 | if (crypto_skcipher_max_keysize(tfm) != 0) |
Eric Biggers | b1f6b4b | 2019-01-06 18:47:43 -0800 | [diff] [blame] | 573 | crypto_skcipher_set_flags(tfm, CRYPTO_TFM_NEED_KEY); |
| 574 | } |
| 575 | |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 576 | static int skcipher_setkey_unaligned(struct crypto_skcipher *tfm, |
| 577 | const u8 *key, unsigned int keylen) |
| 578 | { |
| 579 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); |
| 580 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); |
| 581 | u8 *buffer, *alignbuffer; |
| 582 | unsigned long absize; |
| 583 | int ret; |
| 584 | |
| 585 | absize = keylen + alignmask; |
| 586 | buffer = kmalloc(absize, GFP_ATOMIC); |
| 587 | if (!buffer) |
| 588 | return -ENOMEM; |
| 589 | |
| 590 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); |
| 591 | memcpy(alignbuffer, key, keylen); |
| 592 | ret = cipher->setkey(tfm, alignbuffer, keylen); |
Waiman Long | 453431a | 2020-08-06 23:18:13 -0700 | [diff] [blame] | 593 | kfree_sensitive(buffer); |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 594 | return ret; |
| 595 | } |
| 596 | |
Eric Biggers | 15252d9 | 2019-11-29 10:23:05 -0800 | [diff] [blame] | 597 | int crypto_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key, |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 598 | unsigned int keylen) |
| 599 | { |
| 600 | struct skcipher_alg *cipher = crypto_skcipher_alg(tfm); |
| 601 | unsigned long alignmask = crypto_skcipher_alignmask(tfm); |
Eric Biggers | f8d33fa | 2018-01-03 11:16:29 -0800 | [diff] [blame] | 602 | int err; |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 603 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 604 | if (cipher->co.base.cra_type != &crypto_skcipher_type) { |
Eric Biggers | 7ec0a09 | 2023-10-12 22:56:13 -0700 | [diff] [blame] | 605 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm); |
| 606 | |
| 607 | crypto_lskcipher_clear_flags(*ctx, CRYPTO_TFM_REQ_MASK); |
| 608 | crypto_lskcipher_set_flags(*ctx, |
| 609 | crypto_skcipher_get_flags(tfm) & |
| 610 | CRYPTO_TFM_REQ_MASK); |
| 611 | err = crypto_lskcipher_setkey(*ctx, key, keylen); |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 612 | goto out; |
| 613 | } |
| 614 | |
Eric Biggers | 674f368 | 2019-12-30 21:19:36 -0600 | [diff] [blame] | 615 | if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 616 | return -EINVAL; |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 617 | |
| 618 | if ((unsigned long)key & alignmask) |
Eric Biggers | f8d33fa | 2018-01-03 11:16:29 -0800 | [diff] [blame] | 619 | err = skcipher_setkey_unaligned(tfm, key, keylen); |
| 620 | else |
| 621 | err = cipher->setkey(tfm, key, keylen); |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 622 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 623 | out: |
Eric Biggers | b1f6b4b | 2019-01-06 18:47:43 -0800 | [diff] [blame] | 624 | if (unlikely(err)) { |
| 625 | skcipher_set_needkey(tfm); |
Eric Biggers | f8d33fa | 2018-01-03 11:16:29 -0800 | [diff] [blame] | 626 | return err; |
Eric Biggers | b1f6b4b | 2019-01-06 18:47:43 -0800 | [diff] [blame] | 627 | } |
Eric Biggers | f8d33fa | 2018-01-03 11:16:29 -0800 | [diff] [blame] | 628 | |
| 629 | crypto_skcipher_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
| 630 | return 0; |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 631 | } |
Eric Biggers | 15252d9 | 2019-11-29 10:23:05 -0800 | [diff] [blame] | 632 | EXPORT_SYMBOL_GPL(crypto_skcipher_setkey); |
Herbert Xu | 9933e11 | 2017-05-10 03:48:23 +0800 | [diff] [blame] | 633 | |
Eric Biggers | 81bcbb1 | 2019-06-02 22:45:51 -0700 | [diff] [blame] | 634 | int crypto_skcipher_encrypt(struct skcipher_request *req) |
| 635 | { |
| 636 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 637 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 638 | |
Eric Biggers | 81bcbb1 | 2019-06-02 22:45:51 -0700 | [diff] [blame] | 639 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
Eric Biggers | 29ce50e | 2024-03-12 20:48:21 -0700 | [diff] [blame] | 640 | return -ENOKEY; |
| 641 | if (alg->co.base.cra_type != &crypto_skcipher_type) |
| 642 | return crypto_lskcipher_encrypt_sg(req); |
| 643 | return alg->encrypt(req); |
Eric Biggers | 81bcbb1 | 2019-06-02 22:45:51 -0700 | [diff] [blame] | 644 | } |
| 645 | EXPORT_SYMBOL_GPL(crypto_skcipher_encrypt); |
| 646 | |
| 647 | int crypto_skcipher_decrypt(struct skcipher_request *req) |
| 648 | { |
| 649 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 650 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 651 | |
Eric Biggers | 81bcbb1 | 2019-06-02 22:45:51 -0700 | [diff] [blame] | 652 | if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY) |
Eric Biggers | 29ce50e | 2024-03-12 20:48:21 -0700 | [diff] [blame] | 653 | return -ENOKEY; |
| 654 | if (alg->co.base.cra_type != &crypto_skcipher_type) |
| 655 | return crypto_lskcipher_decrypt_sg(req); |
| 656 | return alg->decrypt(req); |
Eric Biggers | 81bcbb1 | 2019-06-02 22:45:51 -0700 | [diff] [blame] | 657 | } |
| 658 | EXPORT_SYMBOL_GPL(crypto_skcipher_decrypt); |
| 659 | |
Herbert Xu | 662ea18 | 2023-11-28 14:33:19 +0800 | [diff] [blame] | 660 | static int crypto_lskcipher_export(struct skcipher_request *req, void *out) |
| 661 | { |
| 662 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 663 | u8 *ivs = skcipher_request_ctx(req); |
| 664 | |
| 665 | ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1); |
| 666 | |
| 667 | memcpy(out, ivs + crypto_skcipher_ivsize(tfm), |
| 668 | crypto_skcipher_statesize(tfm)); |
| 669 | |
| 670 | return 0; |
| 671 | } |
| 672 | |
| 673 | static int crypto_lskcipher_import(struct skcipher_request *req, const void *in) |
| 674 | { |
| 675 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 676 | u8 *ivs = skcipher_request_ctx(req); |
| 677 | |
| 678 | ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(tfm) + 1); |
| 679 | |
| 680 | memcpy(ivs + crypto_skcipher_ivsize(tfm), in, |
| 681 | crypto_skcipher_statesize(tfm)); |
| 682 | |
| 683 | return 0; |
| 684 | } |
| 685 | |
| 686 | static int skcipher_noexport(struct skcipher_request *req, void *out) |
| 687 | { |
| 688 | return 0; |
| 689 | } |
| 690 | |
| 691 | static int skcipher_noimport(struct skcipher_request *req, const void *in) |
| 692 | { |
| 693 | return 0; |
| 694 | } |
| 695 | |
| 696 | int crypto_skcipher_export(struct skcipher_request *req, void *out) |
| 697 | { |
| 698 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 699 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
| 700 | |
| 701 | if (alg->co.base.cra_type != &crypto_skcipher_type) |
| 702 | return crypto_lskcipher_export(req, out); |
| 703 | return alg->export(req, out); |
| 704 | } |
| 705 | EXPORT_SYMBOL_GPL(crypto_skcipher_export); |
| 706 | |
| 707 | int crypto_skcipher_import(struct skcipher_request *req, const void *in) |
| 708 | { |
| 709 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
| 710 | struct skcipher_alg *alg = crypto_skcipher_alg(tfm); |
| 711 | |
| 712 | if (alg->co.base.cra_type != &crypto_skcipher_type) |
| 713 | return crypto_lskcipher_import(req, in); |
| 714 | return alg->import(req, in); |
| 715 | } |
| 716 | EXPORT_SYMBOL_GPL(crypto_skcipher_import); |
| 717 | |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 718 | static void crypto_skcipher_exit_tfm(struct crypto_tfm *tfm) |
| 719 | { |
| 720 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
| 721 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); |
| 722 | |
| 723 | alg->exit(skcipher); |
| 724 | } |
| 725 | |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 726 | static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm) |
| 727 | { |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 728 | struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm); |
| 729 | struct skcipher_alg *alg = crypto_skcipher_alg(skcipher); |
| 730 | |
Eric Biggers | b1f6b4b | 2019-01-06 18:47:43 -0800 | [diff] [blame] | 731 | skcipher_set_needkey(skcipher); |
Eric Biggers | f8d33fa | 2018-01-03 11:16:29 -0800 | [diff] [blame] | 732 | |
Herbert Xu | 662ea18 | 2023-11-28 14:33:19 +0800 | [diff] [blame] | 733 | if (tfm->__crt_alg->cra_type != &crypto_skcipher_type) { |
| 734 | unsigned am = crypto_skcipher_alignmask(skcipher); |
| 735 | unsigned reqsize; |
| 736 | |
| 737 | reqsize = am & ~(crypto_tfm_ctx_alignment() - 1); |
| 738 | reqsize += crypto_skcipher_ivsize(skcipher); |
| 739 | reqsize += crypto_skcipher_statesize(skcipher); |
| 740 | crypto_skcipher_set_reqsize(skcipher, reqsize); |
| 741 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 742 | return crypto_init_lskcipher_ops_sg(tfm); |
Herbert Xu | 662ea18 | 2023-11-28 14:33:19 +0800 | [diff] [blame] | 743 | } |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 744 | |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 745 | if (alg->exit) |
| 746 | skcipher->base.exit = crypto_skcipher_exit_tfm; |
| 747 | |
| 748 | if (alg->init) |
| 749 | return alg->init(skcipher); |
| 750 | |
| 751 | return 0; |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 752 | } |
| 753 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 754 | static unsigned int crypto_skcipher_extsize(struct crypto_alg *alg) |
| 755 | { |
| 756 | if (alg->cra_type != &crypto_skcipher_type) |
| 757 | return sizeof(struct crypto_lskcipher *); |
| 758 | |
| 759 | return crypto_alg_extsize(alg); |
| 760 | } |
| 761 | |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 762 | static void crypto_skcipher_free_instance(struct crypto_instance *inst) |
| 763 | { |
| 764 | struct skcipher_instance *skcipher = |
| 765 | container_of(inst, struct skcipher_instance, s.base); |
| 766 | |
| 767 | skcipher->free(skcipher); |
| 768 | } |
| 769 | |
| 770 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) |
Gideon Israel Dsouza | d8c34b9 | 2016-12-31 21:26:23 +0530 | [diff] [blame] | 771 | __maybe_unused; |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 772 | static void crypto_skcipher_show(struct seq_file *m, struct crypto_alg *alg) |
| 773 | { |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 774 | struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 775 | |
| 776 | seq_printf(m, "type : skcipher\n"); |
| 777 | seq_printf(m, "async : %s\n", |
| 778 | alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); |
| 779 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
| 780 | seq_printf(m, "min keysize : %u\n", skcipher->min_keysize); |
| 781 | seq_printf(m, "max keysize : %u\n", skcipher->max_keysize); |
| 782 | seq_printf(m, "ivsize : %u\n", skcipher->ivsize); |
| 783 | seq_printf(m, "chunksize : %u\n", skcipher->chunksize); |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 784 | seq_printf(m, "walksize : %u\n", skcipher->walksize); |
Herbert Xu | 662ea18 | 2023-11-28 14:33:19 +0800 | [diff] [blame] | 785 | seq_printf(m, "statesize : %u\n", skcipher->statesize); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 786 | } |
| 787 | |
Herbert Xu | c0f9e01 | 2023-02-16 18:35:28 +0800 | [diff] [blame] | 788 | static int __maybe_unused crypto_skcipher_report( |
| 789 | struct sk_buff *skb, struct crypto_alg *alg) |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 790 | { |
Herbert Xu | 1085680 | 2023-02-16 18:35:21 +0800 | [diff] [blame] | 791 | struct skcipher_alg *skcipher = __crypto_skcipher_alg(alg); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 792 | struct crypto_report_blkcipher rblkcipher; |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 793 | |
Eric Biggers | 37db69e | 2018-11-03 14:56:03 -0700 | [diff] [blame] | 794 | memset(&rblkcipher, 0, sizeof(rblkcipher)); |
| 795 | |
| 796 | strscpy(rblkcipher.type, "skcipher", sizeof(rblkcipher.type)); |
| 797 | strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 798 | |
| 799 | rblkcipher.blocksize = alg->cra_blocksize; |
| 800 | rblkcipher.min_keysize = skcipher->min_keysize; |
| 801 | rblkcipher.max_keysize = skcipher->max_keysize; |
| 802 | rblkcipher.ivsize = skcipher->ivsize; |
| 803 | |
Eric Biggers | 37db69e | 2018-11-03 14:56:03 -0700 | [diff] [blame] | 804 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, |
| 805 | sizeof(rblkcipher), &rblkcipher); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 806 | } |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 807 | |
Eric Biggers | 5325306 | 2019-10-25 12:41:11 -0700 | [diff] [blame] | 808 | static const struct crypto_type crypto_skcipher_type = { |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 809 | .extsize = crypto_skcipher_extsize, |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 810 | .init_tfm = crypto_skcipher_init_tfm, |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 811 | .free = crypto_skcipher_free_instance, |
| 812 | #ifdef CONFIG_PROC_FS |
| 813 | .show = crypto_skcipher_show, |
| 814 | #endif |
Ondrej Mosnacek | b8969a1 | 2023-05-02 10:02:33 +0200 | [diff] [blame] | 815 | #if IS_ENABLED(CONFIG_CRYPTO_USER) |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 816 | .report = crypto_skcipher_report, |
Herbert Xu | c0f9e01 | 2023-02-16 18:35:28 +0800 | [diff] [blame] | 817 | #endif |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 818 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 819 | .maskset = CRYPTO_ALG_TYPE_SKCIPHER_MASK, |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 820 | .type = CRYPTO_ALG_TYPE_SKCIPHER, |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 821 | .tfmsize = offsetof(struct crypto_skcipher, base), |
| 822 | }; |
| 823 | |
Herbert Xu | 3a01d0e | 2016-07-12 13:17:50 +0800 | [diff] [blame] | 824 | int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, |
Eric Biggers | b9f76dd | 2020-01-02 19:58:45 -0800 | [diff] [blame] | 825 | struct crypto_instance *inst, |
| 826 | const char *name, u32 type, u32 mask) |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 827 | { |
Eric Biggers | 5325306 | 2019-10-25 12:41:11 -0700 | [diff] [blame] | 828 | spawn->base.frontend = &crypto_skcipher_type; |
Eric Biggers | de95c95 | 2020-01-02 19:58:48 -0800 | [diff] [blame] | 829 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 830 | } |
Herbert Xu | 3a01d0e | 2016-07-12 13:17:50 +0800 | [diff] [blame] | 831 | EXPORT_SYMBOL_GPL(crypto_grab_skcipher); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 832 | |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 833 | struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name, |
| 834 | u32 type, u32 mask) |
| 835 | { |
Eric Biggers | 5325306 | 2019-10-25 12:41:11 -0700 | [diff] [blame] | 836 | return crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 837 | } |
| 838 | EXPORT_SYMBOL_GPL(crypto_alloc_skcipher); |
| 839 | |
Kees Cook | b350bee | 2018-09-18 19:10:38 -0700 | [diff] [blame] | 840 | struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( |
| 841 | const char *alg_name, u32 type, u32 mask) |
| 842 | { |
| 843 | struct crypto_skcipher *tfm; |
| 844 | |
| 845 | /* Only sync algorithms allowed. */ |
Herbert Xu | e6cb02b | 2022-11-11 18:05:41 +0800 | [diff] [blame] | 846 | mask |= CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE; |
Kees Cook | b350bee | 2018-09-18 19:10:38 -0700 | [diff] [blame] | 847 | |
Eric Biggers | 5325306 | 2019-10-25 12:41:11 -0700 | [diff] [blame] | 848 | tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); |
Kees Cook | b350bee | 2018-09-18 19:10:38 -0700 | [diff] [blame] | 849 | |
| 850 | /* |
| 851 | * Make sure we do not allocate something that might get used with |
| 852 | * an on-stack request: check the request size. |
| 853 | */ |
| 854 | if (!IS_ERR(tfm) && WARN_ON(crypto_skcipher_reqsize(tfm) > |
| 855 | MAX_SYNC_SKCIPHER_REQSIZE)) { |
| 856 | crypto_free_skcipher(tfm); |
| 857 | return ERR_PTR(-EINVAL); |
| 858 | } |
| 859 | |
| 860 | return (struct crypto_sync_skcipher *)tfm; |
| 861 | } |
| 862 | EXPORT_SYMBOL_GPL(crypto_alloc_sync_skcipher); |
| 863 | |
Eric Biggers | d3ca75a | 2019-10-25 12:41:09 -0700 | [diff] [blame] | 864 | int crypto_has_skcipher(const char *alg_name, u32 type, u32 mask) |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 865 | { |
Eric Biggers | 5325306 | 2019-10-25 12:41:11 -0700 | [diff] [blame] | 866 | return crypto_type_has_alg(alg_name, &crypto_skcipher_type, type, mask); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 867 | } |
Eric Biggers | d3ca75a | 2019-10-25 12:41:09 -0700 | [diff] [blame] | 868 | EXPORT_SYMBOL_GPL(crypto_has_skcipher); |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 869 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 870 | int skcipher_prepare_alg_common(struct skcipher_alg_common *alg) |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 871 | { |
| 872 | struct crypto_alg *base = &alg->base; |
| 873 | |
Herbert Xu | 662ea18 | 2023-11-28 14:33:19 +0800 | [diff] [blame] | 874 | if (alg->ivsize > PAGE_SIZE / 8 || alg->chunksize > PAGE_SIZE / 8 || |
| 875 | alg->statesize > PAGE_SIZE / 2 || |
| 876 | (alg->ivsize + alg->statesize) > PAGE_SIZE / 2) |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 877 | return -EINVAL; |
| 878 | |
| 879 | if (!alg->chunksize) |
| 880 | alg->chunksize = base->cra_blocksize; |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 881 | |
| 882 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
| 883 | |
Herbert Xu | 31865c4 | 2023-09-14 16:28:24 +0800 | [diff] [blame] | 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | static int skcipher_prepare_alg(struct skcipher_alg *alg) |
| 888 | { |
| 889 | struct crypto_alg *base = &alg->base; |
| 890 | int err; |
| 891 | |
| 892 | err = skcipher_prepare_alg_common(&alg->co); |
| 893 | if (err) |
| 894 | return err; |
| 895 | |
| 896 | if (alg->walksize > PAGE_SIZE / 8) |
| 897 | return -EINVAL; |
| 898 | |
Ard Biesheuvel | c821f6a | 2016-12-29 14:09:08 +0000 | [diff] [blame] | 899 | if (!alg->walksize) |
| 900 | alg->walksize = alg->chunksize; |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 901 | |
Herbert Xu | 662ea18 | 2023-11-28 14:33:19 +0800 | [diff] [blame] | 902 | if (!alg->statesize) { |
| 903 | alg->import = skcipher_noimport; |
| 904 | alg->export = skcipher_noexport; |
| 905 | } else if (!(alg->import && alg->export)) |
| 906 | return -EINVAL; |
| 907 | |
Eric Biggers | 5325306 | 2019-10-25 12:41:11 -0700 | [diff] [blame] | 908 | base->cra_type = &crypto_skcipher_type; |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 909 | base->cra_flags |= CRYPTO_ALG_TYPE_SKCIPHER; |
| 910 | |
| 911 | return 0; |
| 912 | } |
| 913 | |
| 914 | int crypto_register_skcipher(struct skcipher_alg *alg) |
| 915 | { |
| 916 | struct crypto_alg *base = &alg->base; |
| 917 | int err; |
| 918 | |
| 919 | err = skcipher_prepare_alg(alg); |
| 920 | if (err) |
| 921 | return err; |
| 922 | |
| 923 | return crypto_register_alg(base); |
| 924 | } |
| 925 | EXPORT_SYMBOL_GPL(crypto_register_skcipher); |
| 926 | |
| 927 | void crypto_unregister_skcipher(struct skcipher_alg *alg) |
| 928 | { |
| 929 | crypto_unregister_alg(&alg->base); |
| 930 | } |
| 931 | EXPORT_SYMBOL_GPL(crypto_unregister_skcipher); |
| 932 | |
| 933 | int crypto_register_skciphers(struct skcipher_alg *algs, int count) |
| 934 | { |
| 935 | int i, ret; |
| 936 | |
| 937 | for (i = 0; i < count; i++) { |
| 938 | ret = crypto_register_skcipher(&algs[i]); |
| 939 | if (ret) |
| 940 | goto err; |
| 941 | } |
| 942 | |
| 943 | return 0; |
| 944 | |
| 945 | err: |
| 946 | for (--i; i >= 0; --i) |
| 947 | crypto_unregister_skcipher(&algs[i]); |
| 948 | |
| 949 | return ret; |
| 950 | } |
| 951 | EXPORT_SYMBOL_GPL(crypto_register_skciphers); |
| 952 | |
| 953 | void crypto_unregister_skciphers(struct skcipher_alg *algs, int count) |
| 954 | { |
| 955 | int i; |
| 956 | |
| 957 | for (i = count - 1; i >= 0; --i) |
| 958 | crypto_unregister_skcipher(&algs[i]); |
| 959 | } |
| 960 | EXPORT_SYMBOL_GPL(crypto_unregister_skciphers); |
| 961 | |
| 962 | int skcipher_register_instance(struct crypto_template *tmpl, |
| 963 | struct skcipher_instance *inst) |
| 964 | { |
| 965 | int err; |
| 966 | |
Eric Biggers | d4fdc2d | 2020-01-02 20:04:40 -0800 | [diff] [blame] | 967 | if (WARN_ON(!inst->free)) |
| 968 | return -EINVAL; |
| 969 | |
Herbert Xu | 4e6c3df | 2016-07-12 13:17:31 +0800 | [diff] [blame] | 970 | err = skcipher_prepare_alg(&inst->alg); |
| 971 | if (err) |
| 972 | return err; |
| 973 | |
| 974 | return crypto_register_instance(tmpl, skcipher_crypto_instance(inst)); |
| 975 | } |
| 976 | EXPORT_SYMBOL_GPL(skcipher_register_instance); |
| 977 | |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 978 | static int skcipher_setkey_simple(struct crypto_skcipher *tfm, const u8 *key, |
| 979 | unsigned int keylen) |
| 980 | { |
| 981 | struct crypto_cipher *cipher = skcipher_cipher_simple(tfm); |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 982 | |
| 983 | crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); |
| 984 | crypto_cipher_set_flags(cipher, crypto_skcipher_get_flags(tfm) & |
| 985 | CRYPTO_TFM_REQ_MASK); |
Eric Biggers | af5034e | 2019-12-30 21:19:38 -0600 | [diff] [blame] | 986 | return crypto_cipher_setkey(cipher, key, keylen); |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 987 | } |
| 988 | |
| 989 | static int skcipher_init_tfm_simple(struct crypto_skcipher *tfm) |
| 990 | { |
| 991 | struct skcipher_instance *inst = skcipher_alg_instance(tfm); |
Eric Biggers | d5ed3b6 | 2020-01-02 19:59:05 -0800 | [diff] [blame] | 992 | struct crypto_cipher_spawn *spawn = skcipher_instance_ctx(inst); |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 993 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); |
| 994 | struct crypto_cipher *cipher; |
| 995 | |
| 996 | cipher = crypto_spawn_cipher(spawn); |
| 997 | if (IS_ERR(cipher)) |
| 998 | return PTR_ERR(cipher); |
| 999 | |
| 1000 | ctx->cipher = cipher; |
| 1001 | return 0; |
| 1002 | } |
| 1003 | |
| 1004 | static void skcipher_exit_tfm_simple(struct crypto_skcipher *tfm) |
| 1005 | { |
| 1006 | struct skcipher_ctx_simple *ctx = crypto_skcipher_ctx(tfm); |
| 1007 | |
| 1008 | crypto_free_cipher(ctx->cipher); |
| 1009 | } |
| 1010 | |
| 1011 | static void skcipher_free_instance_simple(struct skcipher_instance *inst) |
| 1012 | { |
Eric Biggers | aacd5b4 | 2020-01-02 19:59:00 -0800 | [diff] [blame] | 1013 | crypto_drop_cipher(skcipher_instance_ctx(inst)); |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1014 | kfree(inst); |
| 1015 | } |
| 1016 | |
| 1017 | /** |
| 1018 | * skcipher_alloc_instance_simple - allocate instance of simple block cipher mode |
| 1019 | * |
| 1020 | * Allocate an skcipher_instance for a simple block cipher mode of operation, |
| 1021 | * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, |
| 1022 | * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, |
| 1023 | * alignmask, and priority are set from the underlying cipher but can be |
| 1024 | * overridden if needed. The tfm context defaults to skcipher_ctx_simple, and |
| 1025 | * default ->setkey(), ->init(), and ->exit() methods are installed. |
| 1026 | * |
| 1027 | * @tmpl: the template being instantiated |
| 1028 | * @tb: the template parameters |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1029 | * |
| 1030 | * Return: a pointer to the new instance, or an ERR_PTR(). The caller still |
| 1031 | * needs to register the instance. |
| 1032 | */ |
Herbert Xu | b3c16bf | 2019-12-20 13:29:40 +0800 | [diff] [blame] | 1033 | struct skcipher_instance *skcipher_alloc_instance_simple( |
| 1034 | struct crypto_template *tmpl, struct rtattr **tb) |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1035 | { |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1036 | u32 mask; |
Eric Biggers | aacd5b4 | 2020-01-02 19:59:00 -0800 | [diff] [blame] | 1037 | struct skcipher_instance *inst; |
| 1038 | struct crypto_cipher_spawn *spawn; |
| 1039 | struct crypto_alg *cipher_alg; |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1040 | int err; |
| 1041 | |
Eric Biggers | 7bcb2c9 | 2020-07-09 23:20:38 -0700 | [diff] [blame] | 1042 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SKCIPHER, &mask); |
| 1043 | if (err) |
| 1044 | return ERR_PTR(err); |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1045 | |
| 1046 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
Eric Biggers | aacd5b4 | 2020-01-02 19:59:00 -0800 | [diff] [blame] | 1047 | if (!inst) |
| 1048 | return ERR_PTR(-ENOMEM); |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1049 | spawn = skcipher_instance_ctx(inst); |
| 1050 | |
Eric Biggers | aacd5b4 | 2020-01-02 19:59:00 -0800 | [diff] [blame] | 1051 | err = crypto_grab_cipher(spawn, skcipher_crypto_instance(inst), |
| 1052 | crypto_attr_alg_name(tb[1]), 0, mask); |
| 1053 | if (err) |
| 1054 | goto err_free_inst; |
| 1055 | cipher_alg = crypto_spawn_cipher_alg(spawn); |
| 1056 | |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1057 | err = crypto_inst_setname(skcipher_crypto_instance(inst), tmpl->name, |
| 1058 | cipher_alg); |
| 1059 | if (err) |
| 1060 | goto err_free_inst; |
| 1061 | |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1062 | inst->free = skcipher_free_instance_simple; |
| 1063 | |
| 1064 | /* Default algorithm properties, can be overridden */ |
| 1065 | inst->alg.base.cra_blocksize = cipher_alg->cra_blocksize; |
| 1066 | inst->alg.base.cra_alignmask = cipher_alg->cra_alignmask; |
| 1067 | inst->alg.base.cra_priority = cipher_alg->cra_priority; |
| 1068 | inst->alg.min_keysize = cipher_alg->cra_cipher.cia_min_keysize; |
| 1069 | inst->alg.max_keysize = cipher_alg->cra_cipher.cia_max_keysize; |
| 1070 | inst->alg.ivsize = cipher_alg->cra_blocksize; |
| 1071 | |
| 1072 | /* Use skcipher_ctx_simple by default, can be overridden */ |
| 1073 | inst->alg.base.cra_ctxsize = sizeof(struct skcipher_ctx_simple); |
| 1074 | inst->alg.setkey = skcipher_setkey_simple; |
| 1075 | inst->alg.init = skcipher_init_tfm_simple; |
| 1076 | inst->alg.exit = skcipher_exit_tfm_simple; |
| 1077 | |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1078 | return inst; |
| 1079 | |
| 1080 | err_free_inst: |
Eric Biggers | aacd5b4 | 2020-01-02 19:59:00 -0800 | [diff] [blame] | 1081 | skcipher_free_instance_simple(inst); |
Eric Biggers | 0872da1 | 2019-01-03 20:16:14 -0800 | [diff] [blame] | 1082 | return ERR_PTR(err); |
| 1083 | } |
| 1084 | EXPORT_SYMBOL_GPL(skcipher_alloc_instance_simple); |
| 1085 | |
Herbert Xu | 7a7ffe6 | 2015-08-20 15:21:45 +0800 | [diff] [blame] | 1086 | MODULE_LICENSE("GPL"); |
| 1087 | MODULE_DESCRIPTION("Symmetric key cipher type"); |
Ard Biesheuvel | 0eb76ba | 2020-12-11 13:27:15 +0100 | [diff] [blame] | 1088 | MODULE_IMPORT_NS(CRYPTO_INTERNAL); |