1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * RSA padding templates. 4 * 5 * Copyright (c) 2015 Intel Corporation 6 */ 7 8 #include <crypto/algapi.h> 9 #include <crypto/akcipher.h> 10 #include <crypto/internal/akcipher.h> 11 #include <crypto/internal/rsa.h> 12 #include <linux/err.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/random.h> 17 #include <linux/scatterlist.h> 18 19 /* 20 * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2]. 21 */ 22 static const u8 rsa_digest_info_md5[] = { 23 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 24 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, /* OID */ 25 0x05, 0x00, 0x04, 0x10 26 }; 27 28 static const u8 rsa_digest_info_sha1[] = { 29 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 30 0x2b, 0x0e, 0x03, 0x02, 0x1a, 31 0x05, 0x00, 0x04, 0x14 32 }; 33 34 static const u8 rsa_digest_info_rmd160[] = { 35 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 36 0x2b, 0x24, 0x03, 0x02, 0x01, 37 0x05, 0x00, 0x04, 0x14 38 }; 39 40 static const u8 rsa_digest_info_sha224[] = { 41 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 42 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 43 0x05, 0x00, 0x04, 0x1c 44 }; 45 46 static const u8 rsa_digest_info_sha256[] = { 47 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 48 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 49 0x05, 0x00, 0x04, 0x20 50 }; 51 52 static const u8 rsa_digest_info_sha384[] = { 53 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 54 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 55 0x05, 0x00, 0x04, 0x30 56 }; 57 58 static const u8 rsa_digest_info_sha512[] = { 59 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 60 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 61 0x05, 0x00, 0x04, 0x40 62 }; 63 64 static const struct rsa_asn1_template { 65 const char *name; 66 const u8 *data; 67 size_t size; 68 } rsa_asn1_templates[] = { 69 #define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) } 70 _(md5), 71 _(sha1), 72 _(rmd160), 73 _(sha256), 74 _(sha384), 75 _(sha512), 76 _(sha224), 77 { NULL } 78 #undef _ 79 }; 80 81 static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name) 82 { 83 const struct rsa_asn1_template *p; 84 85 for (p = rsa_asn1_templates; p->name; p++) 86 if (strcmp(name, p->name) == 0) 87 return p; 88 return NULL; 89 } 90 91 struct pkcs1pad_ctx { 92 struct crypto_akcipher *child; 93 unsigned int key_size; 94 }; 95 96 struct pkcs1pad_inst_ctx { 97 struct crypto_akcipher_spawn spawn; 98 const struct rsa_asn1_template *digest_info; 99 }; 100 101 struct pkcs1pad_request { 102 struct scatterlist in_sg[2], out_sg[1]; 103 uint8_t *in_buf, *out_buf; 104 struct akcipher_request child_req; 105 }; 106 107 static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key, 108 unsigned int keylen) 109 { 110 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 111 int err; 112 113 ctx->key_size = 0; 114 115 err = crypto_akcipher_set_pub_key(ctx->child, key, keylen); 116 if (err) 117 return err; 118 119 /* Find out new modulus size from rsa implementation */ 120 err = crypto_akcipher_maxsize(ctx->child); 121 if (err > PAGE_SIZE) 122 return -ENOTSUPP; 123 124 ctx->key_size = err; 125 return 0; 126 } 127 128 static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key, 129 unsigned int keylen) 130 { 131 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 132 int err; 133 134 ctx->key_size = 0; 135 136 err = crypto_akcipher_set_priv_key(ctx->child, key, keylen); 137 if (err) 138 return err; 139 140 /* Find out new modulus size from rsa implementation */ 141 err = crypto_akcipher_maxsize(ctx->child); 142 if (err > PAGE_SIZE) 143 return -ENOTSUPP; 144 145 ctx->key_size = err; 146 return 0; 147 } 148 149 static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm) 150 { 151 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 152 153 /* 154 * The maximum destination buffer size for the encrypt/sign operations 155 * will be the same as for RSA, even though it's smaller for 156 * decrypt/verify. 157 */ 158 159 return ctx->key_size; 160 } 161 162 static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len, 163 struct scatterlist *next) 164 { 165 int nsegs = next ? 2 : 1; 166 167 sg_init_table(sg, nsegs); 168 sg_set_buf(sg, buf, len); 169 170 if (next) 171 sg_chain(sg, nsegs, next); 172 } 173 174 static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err) 175 { 176 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 177 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 178 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 179 unsigned int pad_len; 180 unsigned int len; 181 u8 *out_buf; 182 183 if (err) 184 goto out; 185 186 len = req_ctx->child_req.dst_len; 187 pad_len = ctx->key_size - len; 188 189 /* Four billion to one */ 190 if (likely(!pad_len)) 191 goto out; 192 193 out_buf = kzalloc(ctx->key_size, GFP_KERNEL); 194 err = -ENOMEM; 195 if (!out_buf) 196 goto out; 197 198 sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len), 199 out_buf + pad_len, len); 200 sg_copy_from_buffer(req->dst, 201 sg_nents_for_len(req->dst, ctx->key_size), 202 out_buf, ctx->key_size); 203 kfree_sensitive(out_buf); 204 205 out: 206 req->dst_len = ctx->key_size; 207 208 kfree(req_ctx->in_buf); 209 210 return err; 211 } 212 213 static void pkcs1pad_encrypt_sign_complete_cb( 214 struct crypto_async_request *child_async_req, int err) 215 { 216 struct akcipher_request *req = child_async_req->data; 217 struct crypto_async_request async_req; 218 219 if (err == -EINPROGRESS) 220 return; 221 222 async_req.data = req->base.data; 223 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); 224 async_req.flags = child_async_req->flags; 225 req->base.complete(&async_req, 226 pkcs1pad_encrypt_sign_complete(req, err)); 227 } 228 229 static int pkcs1pad_encrypt(struct akcipher_request *req) 230 { 231 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 232 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 233 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 234 int err; 235 unsigned int i, ps_end; 236 237 if (!ctx->key_size) 238 return -EINVAL; 239 240 if (req->src_len > ctx->key_size - 11) 241 return -EOVERFLOW; 242 243 if (req->dst_len < ctx->key_size) { 244 req->dst_len = ctx->key_size; 245 return -EOVERFLOW; 246 } 247 248 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, 249 GFP_KERNEL); 250 if (!req_ctx->in_buf) 251 return -ENOMEM; 252 253 ps_end = ctx->key_size - req->src_len - 2; 254 req_ctx->in_buf[0] = 0x02; 255 for (i = 1; i < ps_end; i++) 256 req_ctx->in_buf[i] = 1 + prandom_u32_max(255); 257 req_ctx->in_buf[ps_end] = 0x00; 258 259 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, 260 ctx->key_size - 1 - req->src_len, req->src); 261 262 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 263 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 264 pkcs1pad_encrypt_sign_complete_cb, req); 265 266 /* Reuse output buffer */ 267 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, 268 req->dst, ctx->key_size - 1, req->dst_len); 269 270 err = crypto_akcipher_encrypt(&req_ctx->child_req); 271 if (err != -EINPROGRESS && err != -EBUSY) 272 return pkcs1pad_encrypt_sign_complete(req, err); 273 274 return err; 275 } 276 277 static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err) 278 { 279 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 280 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 281 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 282 unsigned int dst_len; 283 unsigned int pos; 284 u8 *out_buf; 285 286 if (err) 287 goto done; 288 289 err = -EINVAL; 290 dst_len = req_ctx->child_req.dst_len; 291 if (dst_len < ctx->key_size - 1) 292 goto done; 293 294 out_buf = req_ctx->out_buf; 295 if (dst_len == ctx->key_size) { 296 if (out_buf[0] != 0x00) 297 /* Decrypted value had no leading 0 byte */ 298 goto done; 299 300 dst_len--; 301 out_buf++; 302 } 303 304 if (out_buf[0] != 0x02) 305 goto done; 306 307 for (pos = 1; pos < dst_len; pos++) 308 if (out_buf[pos] == 0x00) 309 break; 310 if (pos < 9 || pos == dst_len) 311 goto done; 312 pos++; 313 314 err = 0; 315 316 if (req->dst_len < dst_len - pos) 317 err = -EOVERFLOW; 318 req->dst_len = dst_len - pos; 319 320 if (!err) 321 sg_copy_from_buffer(req->dst, 322 sg_nents_for_len(req->dst, req->dst_len), 323 out_buf + pos, req->dst_len); 324 325 done: 326 kfree_sensitive(req_ctx->out_buf); 327 328 return err; 329 } 330 331 static void pkcs1pad_decrypt_complete_cb( 332 struct crypto_async_request *child_async_req, int err) 333 { 334 struct akcipher_request *req = child_async_req->data; 335 struct crypto_async_request async_req; 336 337 if (err == -EINPROGRESS) 338 return; 339 340 async_req.data = req->base.data; 341 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); 342 async_req.flags = child_async_req->flags; 343 req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err)); 344 } 345 346 static int pkcs1pad_decrypt(struct akcipher_request *req) 347 { 348 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 349 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 350 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 351 int err; 352 353 if (!ctx->key_size || req->src_len != ctx->key_size) 354 return -EINVAL; 355 356 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL); 357 if (!req_ctx->out_buf) 358 return -ENOMEM; 359 360 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, 361 ctx->key_size, NULL); 362 363 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 364 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 365 pkcs1pad_decrypt_complete_cb, req); 366 367 /* Reuse input buffer, output to a new buffer */ 368 akcipher_request_set_crypt(&req_ctx->child_req, req->src, 369 req_ctx->out_sg, req->src_len, 370 ctx->key_size); 371 372 err = crypto_akcipher_decrypt(&req_ctx->child_req); 373 if (err != -EINPROGRESS && err != -EBUSY) 374 return pkcs1pad_decrypt_complete(req, err); 375 376 return err; 377 } 378 379 static int pkcs1pad_sign(struct akcipher_request *req) 380 { 381 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 382 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 383 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 384 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 385 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 386 const struct rsa_asn1_template *digest_info = ictx->digest_info; 387 int err; 388 unsigned int ps_end, digest_size = 0; 389 390 if (!ctx->key_size) 391 return -EINVAL; 392 393 if (digest_info) 394 digest_size = digest_info->size; 395 396 if (req->src_len + digest_size > ctx->key_size - 11) 397 return -EOVERFLOW; 398 399 if (req->dst_len < ctx->key_size) { 400 req->dst_len = ctx->key_size; 401 return -EOVERFLOW; 402 } 403 404 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, 405 GFP_KERNEL); 406 if (!req_ctx->in_buf) 407 return -ENOMEM; 408 409 ps_end = ctx->key_size - digest_size - req->src_len - 2; 410 req_ctx->in_buf[0] = 0x01; 411 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1); 412 req_ctx->in_buf[ps_end] = 0x00; 413 414 if (digest_info) 415 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data, 416 digest_info->size); 417 418 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, 419 ctx->key_size - 1 - req->src_len, req->src); 420 421 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 422 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 423 pkcs1pad_encrypt_sign_complete_cb, req); 424 425 /* Reuse output buffer */ 426 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, 427 req->dst, ctx->key_size - 1, req->dst_len); 428 429 err = crypto_akcipher_decrypt(&req_ctx->child_req); 430 if (err != -EINPROGRESS && err != -EBUSY) 431 return pkcs1pad_encrypt_sign_complete(req, err); 432 433 return err; 434 } 435 436 static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) 437 { 438 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 439 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 440 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 441 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 442 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 443 const struct rsa_asn1_template *digest_info = ictx->digest_info; 444 unsigned int dst_len; 445 unsigned int pos; 446 u8 *out_buf; 447 448 if (err) 449 goto done; 450 451 err = -EINVAL; 452 dst_len = req_ctx->child_req.dst_len; 453 if (dst_len < ctx->key_size - 1) 454 goto done; 455 456 out_buf = req_ctx->out_buf; 457 if (dst_len == ctx->key_size) { 458 if (out_buf[0] != 0x00) 459 /* Decrypted value had no leading 0 byte */ 460 goto done; 461 462 dst_len--; 463 out_buf++; 464 } 465 466 err = -EBADMSG; 467 if (out_buf[0] != 0x01) 468 goto done; 469 470 for (pos = 1; pos < dst_len; pos++) 471 if (out_buf[pos] != 0xff) 472 break; 473 474 if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00) 475 goto done; 476 pos++; 477 478 if (digest_info) { 479 if (crypto_memneq(out_buf + pos, digest_info->data, 480 digest_info->size)) 481 goto done; 482 483 pos += digest_info->size; 484 } 485 486 err = 0; 487 488 if (req->dst_len != dst_len - pos) { 489 err = -EKEYREJECTED; 490 req->dst_len = dst_len - pos; 491 goto done; 492 } 493 /* Extract appended digest. */ 494 sg_pcopy_to_buffer(req->src, 495 sg_nents_for_len(req->src, 496 req->src_len + req->dst_len), 497 req_ctx->out_buf + ctx->key_size, 498 req->dst_len, ctx->key_size); 499 /* Do the actual verification step. */ 500 if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos, 501 req->dst_len) != 0) 502 err = -EKEYREJECTED; 503 done: 504 kfree_sensitive(req_ctx->out_buf); 505 506 return err; 507 } 508 509 static void pkcs1pad_verify_complete_cb( 510 struct crypto_async_request *child_async_req, int err) 511 { 512 struct akcipher_request *req = child_async_req->data; 513 struct crypto_async_request async_req; 514 515 if (err == -EINPROGRESS) 516 return; 517 518 async_req.data = req->base.data; 519 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); 520 async_req.flags = child_async_req->flags; 521 req->base.complete(&async_req, pkcs1pad_verify_complete(req, err)); 522 } 523 524 /* 525 * The verify operation is here for completeness similar to the verification 526 * defined in RFC2313 section 10.2 except that block type 0 is not accepted, 527 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to 528 * retrieve the DigestInfo from a signature, instead the user is expected 529 * to call the sign operation to generate the expected signature and compare 530 * signatures instead of the message-digests. 531 */ 532 static int pkcs1pad_verify(struct akcipher_request *req) 533 { 534 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 535 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 536 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 537 int err; 538 539 if (WARN_ON(req->dst) || 540 WARN_ON(!req->dst_len) || 541 !ctx->key_size || req->src_len < ctx->key_size) 542 return -EINVAL; 543 544 req_ctx->out_buf = kmalloc(ctx->key_size + req->dst_len, GFP_KERNEL); 545 if (!req_ctx->out_buf) 546 return -ENOMEM; 547 548 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, 549 ctx->key_size, NULL); 550 551 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 552 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 553 pkcs1pad_verify_complete_cb, req); 554 555 /* Reuse input buffer, output to a new buffer */ 556 akcipher_request_set_crypt(&req_ctx->child_req, req->src, 557 req_ctx->out_sg, req->src_len, 558 ctx->key_size); 559 560 err = crypto_akcipher_encrypt(&req_ctx->child_req); 561 if (err != -EINPROGRESS && err != -EBUSY) 562 return pkcs1pad_verify_complete(req, err); 563 564 return err; 565 } 566 567 static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) 568 { 569 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 570 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 571 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 572 struct crypto_akcipher *child_tfm; 573 574 child_tfm = crypto_spawn_akcipher(&ictx->spawn); 575 if (IS_ERR(child_tfm)) 576 return PTR_ERR(child_tfm); 577 578 ctx->child = child_tfm; 579 return 0; 580 } 581 582 static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm) 583 { 584 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 585 586 crypto_free_akcipher(ctx->child); 587 } 588 589 static void pkcs1pad_free(struct akcipher_instance *inst) 590 { 591 struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst); 592 struct crypto_akcipher_spawn *spawn = &ctx->spawn; 593 594 crypto_drop_akcipher(spawn); 595 kfree(inst); 596 } 597 598 static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb) 599 { 600 u32 mask; 601 struct akcipher_instance *inst; 602 struct pkcs1pad_inst_ctx *ctx; 603 struct akcipher_alg *rsa_alg; 604 const char *hash_name; 605 int err; 606 607 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask); 608 if (err) 609 return err; 610 611 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 612 if (!inst) 613 return -ENOMEM; 614 615 ctx = akcipher_instance_ctx(inst); 616 617 err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst), 618 crypto_attr_alg_name(tb[1]), 0, mask); 619 if (err) 620 goto err_free_inst; 621 622 rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn); 623 624 err = -ENAMETOOLONG; 625 hash_name = crypto_attr_alg_name(tb[2]); 626 if (IS_ERR(hash_name)) { 627 if (snprintf(inst->alg.base.cra_name, 628 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", 629 rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) 630 goto err_free_inst; 631 632 if (snprintf(inst->alg.base.cra_driver_name, 633 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", 634 rsa_alg->base.cra_driver_name) >= 635 CRYPTO_MAX_ALG_NAME) 636 goto err_free_inst; 637 } else { 638 ctx->digest_info = rsa_lookup_asn1(hash_name); 639 if (!ctx->digest_info) { 640 err = -EINVAL; 641 goto err_free_inst; 642 } 643 644 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 645 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name, 646 hash_name) >= CRYPTO_MAX_ALG_NAME) 647 goto err_free_inst; 648 649 if (snprintf(inst->alg.base.cra_driver_name, 650 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)", 651 rsa_alg->base.cra_driver_name, 652 hash_name) >= CRYPTO_MAX_ALG_NAME) 653 goto err_free_inst; 654 } 655 656 inst->alg.base.cra_priority = rsa_alg->base.cra_priority; 657 inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx); 658 659 inst->alg.init = pkcs1pad_init_tfm; 660 inst->alg.exit = pkcs1pad_exit_tfm; 661 662 inst->alg.encrypt = pkcs1pad_encrypt; 663 inst->alg.decrypt = pkcs1pad_decrypt; 664 inst->alg.sign = pkcs1pad_sign; 665 inst->alg.verify = pkcs1pad_verify; 666 inst->alg.set_pub_key = pkcs1pad_set_pub_key; 667 inst->alg.set_priv_key = pkcs1pad_set_priv_key; 668 inst->alg.max_size = pkcs1pad_get_max_size; 669 inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize; 670 671 inst->free = pkcs1pad_free; 672 673 err = akcipher_register_instance(tmpl, inst); 674 if (err) { 675 err_free_inst: 676 pkcs1pad_free(inst); 677 } 678 return err; 679 } 680 681 struct crypto_template rsa_pkcs1pad_tmpl = { 682 .name = "pkcs1pad", 683 .create = pkcs1pad_create, 684 .module = THIS_MODULE, 685 }; 686