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 */ 22static 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 28static 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 34static 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 40static 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 46static 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 52static 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 58static 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 64static 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 81static 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 91struct pkcs1pad_ctx { 92 struct crypto_akcipher *child; 93 unsigned int key_size; 94}; 95 96struct pkcs1pad_inst_ctx { 97 struct crypto_akcipher_spawn spawn; 98 const struct rsa_asn1_template *digest_info; 99}; 100 101struct 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 107static 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 128static 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 149static 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 162static 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 174static 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 205out: 206 req->dst_len = ctx->key_size; 207 208 kfree(req_ctx->in_buf); 209 210 return err; 211} 212 213static 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; 217 218 if (err == -EINPROGRESS) 219 goto out; 220 221 err = pkcs1pad_encrypt_sign_complete(req, err); 222 223out: 224 akcipher_request_complete(req, err); 225} 226 227static int pkcs1pad_encrypt(struct akcipher_request *req) 228{ 229 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 230 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 231 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 232 int err; 233 unsigned int i, ps_end; 234 235 if (!ctx->key_size) 236 return -EINVAL; 237 238 if (req->src_len > ctx->key_size - 11) 239 return -EOVERFLOW; 240 241 if (req->dst_len < ctx->key_size) { 242 req->dst_len = ctx->key_size; 243 return -EOVERFLOW; 244 } 245 246 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, 247 GFP_KERNEL); 248 if (!req_ctx->in_buf) 249 return -ENOMEM; 250 251 ps_end = ctx->key_size - req->src_len - 2; 252 req_ctx->in_buf[0] = 0x02; 253 for (i = 1; i < ps_end; i++) 254 req_ctx->in_buf[i] = 1 + prandom_u32_max(255); 255 req_ctx->in_buf[ps_end] = 0x00; 256 257 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, 258 ctx->key_size - 1 - req->src_len, req->src); 259 260 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 261 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 262 pkcs1pad_encrypt_sign_complete_cb, req); 263 264 /* Reuse output buffer */ 265 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, 266 req->dst, ctx->key_size - 1, req->dst_len); 267 268 err = crypto_akcipher_encrypt(&req_ctx->child_req); 269 if (err != -EINPROGRESS && err != -EBUSY) 270 return pkcs1pad_encrypt_sign_complete(req, err); 271 272 return err; 273} 274 275static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err) 276{ 277 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 278 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 279 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 280 unsigned int dst_len; 281 unsigned int pos; 282 u8 *out_buf; 283 284 if (err) 285 goto done; 286 287 err = -EINVAL; 288 dst_len = req_ctx->child_req.dst_len; 289 if (dst_len < ctx->key_size - 1) 290 goto done; 291 292 out_buf = req_ctx->out_buf; 293 if (dst_len == ctx->key_size) { 294 if (out_buf[0] != 0x00) 295 /* Decrypted value had no leading 0 byte */ 296 goto done; 297 298 dst_len--; 299 out_buf++; 300 } 301 302 if (out_buf[0] != 0x02) 303 goto done; 304 305 for (pos = 1; pos < dst_len; pos++) 306 if (out_buf[pos] == 0x00) 307 break; 308 if (pos < 9 || pos == dst_len) 309 goto done; 310 pos++; 311 312 err = 0; 313 314 if (req->dst_len < dst_len - pos) 315 err = -EOVERFLOW; 316 req->dst_len = dst_len - pos; 317 318 if (!err) 319 sg_copy_from_buffer(req->dst, 320 sg_nents_for_len(req->dst, req->dst_len), 321 out_buf + pos, req->dst_len); 322 323done: 324 kfree_sensitive(req_ctx->out_buf); 325 326 return err; 327} 328 329static void pkcs1pad_decrypt_complete_cb( 330 struct crypto_async_request *child_async_req, int err) 331{ 332 struct akcipher_request *req = child_async_req->data; 333 334 if (err == -EINPROGRESS) 335 goto out; 336 337 err = pkcs1pad_decrypt_complete(req, err); 338 339out: 340 akcipher_request_complete(req, err); 341} 342 343static int pkcs1pad_decrypt(struct akcipher_request *req) 344{ 345 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 346 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 347 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 348 int err; 349 350 if (!ctx->key_size || req->src_len != ctx->key_size) 351 return -EINVAL; 352 353 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL); 354 if (!req_ctx->out_buf) 355 return -ENOMEM; 356 357 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, 358 ctx->key_size, NULL); 359 360 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 361 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 362 pkcs1pad_decrypt_complete_cb, req); 363 364 /* Reuse input buffer, output to a new buffer */ 365 akcipher_request_set_crypt(&req_ctx->child_req, req->src, 366 req_ctx->out_sg, req->src_len, 367 ctx->key_size); 368 369 err = crypto_akcipher_decrypt(&req_ctx->child_req); 370 if (err != -EINPROGRESS && err != -EBUSY) 371 return pkcs1pad_decrypt_complete(req, err); 372 373 return err; 374} 375 376static int pkcs1pad_sign(struct akcipher_request *req) 377{ 378 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 379 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 380 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 381 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 382 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 383 const struct rsa_asn1_template *digest_info = ictx->digest_info; 384 int err; 385 unsigned int ps_end, digest_size = 0; 386 387 if (!ctx->key_size) 388 return -EINVAL; 389 390 if (digest_info) 391 digest_size = digest_info->size; 392 393 if (req->src_len + digest_size > ctx->key_size - 11) 394 return -EOVERFLOW; 395 396 if (req->dst_len < ctx->key_size) { 397 req->dst_len = ctx->key_size; 398 return -EOVERFLOW; 399 } 400 401 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, 402 GFP_KERNEL); 403 if (!req_ctx->in_buf) 404 return -ENOMEM; 405 406 ps_end = ctx->key_size - digest_size - req->src_len - 2; 407 req_ctx->in_buf[0] = 0x01; 408 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1); 409 req_ctx->in_buf[ps_end] = 0x00; 410 411 if (digest_info) 412 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data, 413 digest_info->size); 414 415 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, 416 ctx->key_size - 1 - req->src_len, req->src); 417 418 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 419 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 420 pkcs1pad_encrypt_sign_complete_cb, req); 421 422 /* Reuse output buffer */ 423 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, 424 req->dst, ctx->key_size - 1, req->dst_len); 425 426 err = crypto_akcipher_decrypt(&req_ctx->child_req); 427 if (err != -EINPROGRESS && err != -EBUSY) 428 return pkcs1pad_encrypt_sign_complete(req, err); 429 430 return err; 431} 432 433static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) 434{ 435 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 436 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 437 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 438 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 439 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 440 const struct rsa_asn1_template *digest_info = ictx->digest_info; 441 unsigned int dst_len; 442 unsigned int pos; 443 u8 *out_buf; 444 445 if (err) 446 goto done; 447 448 err = -EINVAL; 449 dst_len = req_ctx->child_req.dst_len; 450 if (dst_len < ctx->key_size - 1) 451 goto done; 452 453 out_buf = req_ctx->out_buf; 454 if (dst_len == ctx->key_size) { 455 if (out_buf[0] != 0x00) 456 /* Decrypted value had no leading 0 byte */ 457 goto done; 458 459 dst_len--; 460 out_buf++; 461 } 462 463 err = -EBADMSG; 464 if (out_buf[0] != 0x01) 465 goto done; 466 467 for (pos = 1; pos < dst_len; pos++) 468 if (out_buf[pos] != 0xff) 469 break; 470 471 if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00) 472 goto done; 473 pos++; 474 475 if (digest_info) { 476 if (digest_info->size > dst_len - pos) 477 goto done; 478 if (crypto_memneq(out_buf + pos, digest_info->data, 479 digest_info->size)) 480 goto done; 481 482 pos += digest_info->size; 483 } 484 485 err = 0; 486 487 if (req->dst_len != dst_len - pos) { 488 err = -EKEYREJECTED; 489 req->dst_len = dst_len - pos; 490 goto done; 491 } 492 /* Extract appended digest. */ 493 sg_pcopy_to_buffer(req->src, 494 sg_nents_for_len(req->src, 495 req->src_len + req->dst_len), 496 req_ctx->out_buf + ctx->key_size, 497 req->dst_len, req->src_len); 498 /* Do the actual verification step. */ 499 if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos, 500 req->dst_len) != 0) 501 err = -EKEYREJECTED; 502done: 503 kfree_sensitive(req_ctx->out_buf); 504 505 return err; 506} 507 508static void pkcs1pad_verify_complete_cb( 509 struct crypto_async_request *child_async_req, int err) 510{ 511 struct akcipher_request *req = child_async_req->data; 512 513 if (err == -EINPROGRESS) 514 goto out; 515 516 err = pkcs1pad_verify_complete(req, err); 517 518out: 519 akcipher_request_complete(req, err); 520} 521 522/* 523 * The verify operation is here for completeness similar to the verification 524 * defined in RFC2313 section 10.2 except that block type 0 is not accepted, 525 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to 526 * retrieve the DigestInfo from a signature, instead the user is expected 527 * to call the sign operation to generate the expected signature and compare 528 * signatures instead of the message-digests. 529 */ 530static int pkcs1pad_verify(struct akcipher_request *req) 531{ 532 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 533 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 534 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 535 int err; 536 537 if (WARN_ON(req->dst) || 538 WARN_ON(!req->dst_len) || 539 !ctx->key_size || req->src_len != ctx->key_size) 540 return -EINVAL; 541 542 req_ctx->out_buf = kmalloc(ctx->key_size + req->dst_len, GFP_KERNEL); 543 if (!req_ctx->out_buf) 544 return -ENOMEM; 545 546 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, 547 ctx->key_size, NULL); 548 549 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 550 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 551 pkcs1pad_verify_complete_cb, req); 552 553 /* Reuse input buffer, output to a new buffer */ 554 akcipher_request_set_crypt(&req_ctx->child_req, req->src, 555 req_ctx->out_sg, req->src_len, 556 ctx->key_size); 557 558 err = crypto_akcipher_encrypt(&req_ctx->child_req); 559 if (err != -EINPROGRESS && err != -EBUSY) 560 return pkcs1pad_verify_complete(req, err); 561 562 return err; 563} 564 565static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) 566{ 567 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 568 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 569 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 570 struct crypto_akcipher *child_tfm; 571 572 child_tfm = crypto_spawn_akcipher(&ictx->spawn); 573 if (IS_ERR(child_tfm)) 574 return PTR_ERR(child_tfm); 575 576 ctx->child = child_tfm; 577 return 0; 578} 579 580static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm) 581{ 582 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 583 584 crypto_free_akcipher(ctx->child); 585} 586 587static void pkcs1pad_free(struct akcipher_instance *inst) 588{ 589 struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst); 590 struct crypto_akcipher_spawn *spawn = &ctx->spawn; 591 592 crypto_drop_akcipher(spawn); 593 kfree(inst); 594} 595 596static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb) 597{ 598 u32 mask; 599 struct akcipher_instance *inst; 600 struct pkcs1pad_inst_ctx *ctx; 601 struct akcipher_alg *rsa_alg; 602 const char *hash_name; 603 int err; 604 605 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask); 606 if (err) 607 return err; 608 609 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 610 if (!inst) 611 return -ENOMEM; 612 613 ctx = akcipher_instance_ctx(inst); 614 615 err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst), 616 crypto_attr_alg_name(tb[1]), 0, mask); 617 if (err) 618 goto err_free_inst; 619 620 rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn); 621 622 if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) { 623 err = -EINVAL; 624 goto err_free_inst; 625 } 626 627 err = -ENAMETOOLONG; 628 hash_name = crypto_attr_alg_name(tb[2]); 629 if (IS_ERR(hash_name)) { 630 if (snprintf(inst->alg.base.cra_name, 631 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", 632 rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) 633 goto err_free_inst; 634 635 if (snprintf(inst->alg.base.cra_driver_name, 636 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", 637 rsa_alg->base.cra_driver_name) >= 638 CRYPTO_MAX_ALG_NAME) 639 goto err_free_inst; 640 } else { 641 ctx->digest_info = rsa_lookup_asn1(hash_name); 642 if (!ctx->digest_info) { 643 err = -EINVAL; 644 goto err_free_inst; 645 } 646 647 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 648 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name, 649 hash_name) >= CRYPTO_MAX_ALG_NAME) 650 goto err_free_inst; 651 652 if (snprintf(inst->alg.base.cra_driver_name, 653 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)", 654 rsa_alg->base.cra_driver_name, 655 hash_name) >= CRYPTO_MAX_ALG_NAME) 656 goto err_free_inst; 657 } 658 659 inst->alg.base.cra_priority = rsa_alg->base.cra_priority; 660 inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx); 661 662 inst->alg.init = pkcs1pad_init_tfm; 663 inst->alg.exit = pkcs1pad_exit_tfm; 664 665 inst->alg.encrypt = pkcs1pad_encrypt; 666 inst->alg.decrypt = pkcs1pad_decrypt; 667 inst->alg.sign = pkcs1pad_sign; 668 inst->alg.verify = pkcs1pad_verify; 669 inst->alg.set_pub_key = pkcs1pad_set_pub_key; 670 inst->alg.set_priv_key = pkcs1pad_set_priv_key; 671 inst->alg.max_size = pkcs1pad_get_max_size; 672 inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize; 673 674 inst->free = pkcs1pad_free; 675 676 err = akcipher_register_instance(tmpl, inst); 677 if (err) { 678err_free_inst: 679 pkcs1pad_free(inst); 680 } 681 return err; 682} 683 684struct crypto_template rsa_pkcs1pad_tmpl = { 685 .name = "pkcs1pad", 686 .create = pkcs1pad_create, 687 .module = THIS_MODULE, 688}; 689