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_ATOMIC); 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(void *data, int err) 214{ 215 struct akcipher_request *req = data; 216 217 if (err == -EINPROGRESS) 218 goto out; 219 220 err = pkcs1pad_encrypt_sign_complete(req, err); 221 222out: 223 akcipher_request_complete(req, err); 224} 225 226static int pkcs1pad_encrypt(struct akcipher_request *req) 227{ 228 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 229 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 230 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 231 int err; 232 unsigned int i, ps_end; 233 234 if (!ctx->key_size) 235 return -EINVAL; 236 237 if (req->src_len > ctx->key_size - 11) 238 return -EOVERFLOW; 239 240 if (req->dst_len < ctx->key_size) { 241 req->dst_len = ctx->key_size; 242 return -EOVERFLOW; 243 } 244 245 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, 246 GFP_KERNEL); 247 if (!req_ctx->in_buf) 248 return -ENOMEM; 249 250 ps_end = ctx->key_size - req->src_len - 2; 251 req_ctx->in_buf[0] = 0x02; 252 for (i = 1; i < ps_end; i++) 253 req_ctx->in_buf[i] = get_random_u32_inclusive(1, 255); 254 req_ctx->in_buf[ps_end] = 0x00; 255 256 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, 257 ctx->key_size - 1 - req->src_len, req->src); 258 259 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 260 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 261 pkcs1pad_encrypt_sign_complete_cb, req); 262 263 /* Reuse output buffer */ 264 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, 265 req->dst, ctx->key_size - 1, req->dst_len); 266 267 err = crypto_akcipher_encrypt(&req_ctx->child_req); 268 if (err != -EINPROGRESS && err != -EBUSY) 269 return pkcs1pad_encrypt_sign_complete(req, err); 270 271 return err; 272} 273 274static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err) 275{ 276 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 277 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 278 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 279 unsigned int dst_len; 280 unsigned int pos; 281 u8 *out_buf; 282 283 if (err) 284 goto done; 285 286 err = -EINVAL; 287 dst_len = req_ctx->child_req.dst_len; 288 if (dst_len < ctx->key_size - 1) 289 goto done; 290 291 out_buf = req_ctx->out_buf; 292 if (dst_len == ctx->key_size) { 293 if (out_buf[0] != 0x00) 294 /* Decrypted value had no leading 0 byte */ 295 goto done; 296 297 dst_len--; 298 out_buf++; 299 } 300 301 if (out_buf[0] != 0x02) 302 goto done; 303 304 for (pos = 1; pos < dst_len; pos++) 305 if (out_buf[pos] == 0x00) 306 break; 307 if (pos < 9 || pos == dst_len) 308 goto done; 309 pos++; 310 311 err = 0; 312 313 if (req->dst_len < dst_len - pos) 314 err = -EOVERFLOW; 315 req->dst_len = dst_len - pos; 316 317 if (!err) 318 sg_copy_from_buffer(req->dst, 319 sg_nents_for_len(req->dst, req->dst_len), 320 out_buf + pos, req->dst_len); 321 322done: 323 kfree_sensitive(req_ctx->out_buf); 324 325 return err; 326} 327 328static void pkcs1pad_decrypt_complete_cb(void *data, int err) 329{ 330 struct akcipher_request *req = data; 331 332 if (err == -EINPROGRESS) 333 goto out; 334 335 err = pkcs1pad_decrypt_complete(req, err); 336 337out: 338 akcipher_request_complete(req, err); 339} 340 341static int pkcs1pad_decrypt(struct akcipher_request *req) 342{ 343 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 344 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 345 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 346 int err; 347 348 if (!ctx->key_size || req->src_len != ctx->key_size) 349 return -EINVAL; 350 351 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL); 352 if (!req_ctx->out_buf) 353 return -ENOMEM; 354 355 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, 356 ctx->key_size, NULL); 357 358 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 359 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 360 pkcs1pad_decrypt_complete_cb, req); 361 362 /* Reuse input buffer, output to a new buffer */ 363 akcipher_request_set_crypt(&req_ctx->child_req, req->src, 364 req_ctx->out_sg, req->src_len, 365 ctx->key_size); 366 367 err = crypto_akcipher_decrypt(&req_ctx->child_req); 368 if (err != -EINPROGRESS && err != -EBUSY) 369 return pkcs1pad_decrypt_complete(req, err); 370 371 return err; 372} 373 374static int pkcs1pad_sign(struct akcipher_request *req) 375{ 376 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 377 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 378 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 379 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 380 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 381 const struct rsa_asn1_template *digest_info = ictx->digest_info; 382 int err; 383 unsigned int ps_end, digest_info_size = 0; 384 385 if (!ctx->key_size) 386 return -EINVAL; 387 388 if (digest_info) 389 digest_info_size = digest_info->size; 390 391 if (req->src_len + digest_info_size > ctx->key_size - 11) 392 return -EOVERFLOW; 393 394 if (req->dst_len < ctx->key_size) { 395 req->dst_len = ctx->key_size; 396 return -EOVERFLOW; 397 } 398 399 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, 400 GFP_KERNEL); 401 if (!req_ctx->in_buf) 402 return -ENOMEM; 403 404 ps_end = ctx->key_size - digest_info_size - req->src_len - 2; 405 req_ctx->in_buf[0] = 0x01; 406 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1); 407 req_ctx->in_buf[ps_end] = 0x00; 408 409 if (digest_info) 410 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data, 411 digest_info->size); 412 413 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, 414 ctx->key_size - 1 - req->src_len, req->src); 415 416 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 417 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 418 pkcs1pad_encrypt_sign_complete_cb, req); 419 420 /* Reuse output buffer */ 421 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, 422 req->dst, ctx->key_size - 1, req->dst_len); 423 424 err = crypto_akcipher_decrypt(&req_ctx->child_req); 425 if (err != -EINPROGRESS && err != -EBUSY) 426 return pkcs1pad_encrypt_sign_complete(req, err); 427 428 return err; 429} 430 431static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) 432{ 433 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 434 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 435 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 436 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 437 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 438 const struct rsa_asn1_template *digest_info = ictx->digest_info; 439 const unsigned int sig_size = req->src_len; 440 const unsigned int digest_size = req->dst_len; 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 (digest_size != 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, sig_size + digest_size), 495 req_ctx->out_buf + ctx->key_size, 496 digest_size, sig_size); 497 /* Do the actual verification step. */ 498 if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos, 499 digest_size) != 0) 500 err = -EKEYREJECTED; 501done: 502 kfree_sensitive(req_ctx->out_buf); 503 504 return err; 505} 506 507static void pkcs1pad_verify_complete_cb(void *data, int err) 508{ 509 struct akcipher_request *req = data; 510 511 if (err == -EINPROGRESS) 512 goto out; 513 514 err = pkcs1pad_verify_complete(req, err); 515 516out: 517 akcipher_request_complete(req, err); 518} 519 520/* 521 * The verify operation is here for completeness similar to the verification 522 * defined in RFC2313 section 10.2 except that block type 0 is not accepted, 523 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to 524 * retrieve the DigestInfo from a signature, instead the user is expected 525 * to call the sign operation to generate the expected signature and compare 526 * signatures instead of the message-digests. 527 */ 528static int pkcs1pad_verify(struct akcipher_request *req) 529{ 530 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); 531 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 532 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); 533 const unsigned int sig_size = req->src_len; 534 const unsigned int digest_size = req->dst_len; 535 int err; 536 537 if (WARN_ON(req->dst) || WARN_ON(!digest_size) || 538 !ctx->key_size || sig_size != ctx->key_size) 539 return -EINVAL; 540 541 req_ctx->out_buf = kmalloc(ctx->key_size + digest_size, GFP_KERNEL); 542 if (!req_ctx->out_buf) 543 return -ENOMEM; 544 545 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, 546 ctx->key_size, NULL); 547 548 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); 549 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, 550 pkcs1pad_verify_complete_cb, req); 551 552 /* Reuse input buffer, output to a new buffer */ 553 akcipher_request_set_crypt(&req_ctx->child_req, req->src, 554 req_ctx->out_sg, sig_size, ctx->key_size); 555 556 err = crypto_akcipher_encrypt(&req_ctx->child_req); 557 if (err != -EINPROGRESS && err != -EBUSY) 558 return pkcs1pad_verify_complete(req, err); 559 560 return err; 561} 562 563static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) 564{ 565 struct akcipher_instance *inst = akcipher_alg_instance(tfm); 566 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); 567 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); 568 struct crypto_akcipher *child_tfm; 569 570 child_tfm = crypto_spawn_akcipher(&ictx->spawn); 571 if (IS_ERR(child_tfm)) 572 return PTR_ERR(child_tfm); 573 574 ctx->child = child_tfm; 575 576 akcipher_set_reqsize(tfm, sizeof(struct pkcs1pad_request) + 577 crypto_akcipher_reqsize(child_tfm)); 578 579 return 0; 580} 581 582static 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 589static 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 598static 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 if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) { 625 err = -EINVAL; 626 goto err_free_inst; 627 } 628 629 err = -ENAMETOOLONG; 630 hash_name = crypto_attr_alg_name(tb[2]); 631 if (IS_ERR(hash_name)) { 632 if (snprintf(inst->alg.base.cra_name, 633 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", 634 rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) 635 goto err_free_inst; 636 637 if (snprintf(inst->alg.base.cra_driver_name, 638 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", 639 rsa_alg->base.cra_driver_name) >= 640 CRYPTO_MAX_ALG_NAME) 641 goto err_free_inst; 642 } else { 643 ctx->digest_info = rsa_lookup_asn1(hash_name); 644 if (!ctx->digest_info) { 645 err = -EINVAL; 646 goto err_free_inst; 647 } 648 649 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 650 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name, 651 hash_name) >= CRYPTO_MAX_ALG_NAME) 652 goto err_free_inst; 653 654 if (snprintf(inst->alg.base.cra_driver_name, 655 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)", 656 rsa_alg->base.cra_driver_name, 657 hash_name) >= CRYPTO_MAX_ALG_NAME) 658 goto err_free_inst; 659 } 660 661 inst->alg.base.cra_priority = rsa_alg->base.cra_priority; 662 inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx); 663 664 inst->alg.init = pkcs1pad_init_tfm; 665 inst->alg.exit = pkcs1pad_exit_tfm; 666 667 inst->alg.encrypt = pkcs1pad_encrypt; 668 inst->alg.decrypt = pkcs1pad_decrypt; 669 inst->alg.sign = pkcs1pad_sign; 670 inst->alg.verify = pkcs1pad_verify; 671 inst->alg.set_pub_key = pkcs1pad_set_pub_key; 672 inst->alg.set_priv_key = pkcs1pad_set_priv_key; 673 inst->alg.max_size = pkcs1pad_get_max_size; 674 675 inst->free = pkcs1pad_free; 676 677 err = akcipher_register_instance(tmpl, inst); 678 if (err) { 679err_free_inst: 680 pkcs1pad_free(inst); 681 } 682 return err; 683} 684 685struct crypto_template rsa_pkcs1pad_tmpl = { 686 .name = "pkcs1pad", 687 .create = pkcs1pad_create, 688 .module = THIS_MODULE, 689}; 690