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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * RSA padding templates.4 *5 * Copyright (c) 2015 Intel Corporation6 */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, 0x1026};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, 0x1432};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, 0x1438};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, 0x1c44};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, 0x2050};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, 0x3056};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, 0x4062};63 64static const u8 rsa_digest_info_sha3_256[] = {65 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,66 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x08,67 0x05, 0x00, 0x04, 0x2068};69 70static const u8 rsa_digest_info_sha3_384[] = {71 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,72 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x09,73 0x05, 0x00, 0x04, 0x3074};75 76static const u8 rsa_digest_info_sha3_512[] = {77 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,78 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x0A,79 0x05, 0x00, 0x04, 0x4080};81 82static const struct rsa_asn1_template {83 const char *name;84 const u8 *data;85 size_t size;86} rsa_asn1_templates[] = {87#define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) }88 _(md5),89 _(sha1),90 _(rmd160),91 _(sha256),92 _(sha384),93 _(sha512),94 _(sha224),95#undef _96#define _(X) { "sha3-" #X, rsa_digest_info_sha3_##X, sizeof(rsa_digest_info_sha3_##X) }97 _(256),98 _(384),99 _(512),100#undef _101 { NULL }102};103 104static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)105{106 const struct rsa_asn1_template *p;107 108 for (p = rsa_asn1_templates; p->name; p++)109 if (strcmp(name, p->name) == 0)110 return p;111 return NULL;112}113 114struct pkcs1pad_ctx {115 struct crypto_akcipher *child;116 unsigned int key_size;117};118 119struct pkcs1pad_inst_ctx {120 struct crypto_akcipher_spawn spawn;121 const struct rsa_asn1_template *digest_info;122};123 124struct pkcs1pad_request {125 struct scatterlist in_sg[2], out_sg[1];126 uint8_t *in_buf, *out_buf;127 struct akcipher_request child_req;128};129 130static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,131 unsigned int keylen)132{133 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);134 int err;135 136 ctx->key_size = 0;137 138 err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);139 if (err)140 return err;141 142 /* Find out new modulus size from rsa implementation */143 err = crypto_akcipher_maxsize(ctx->child);144 if (err > PAGE_SIZE)145 return -ENOTSUPP;146 147 ctx->key_size = err;148 return 0;149}150 151static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,152 unsigned int keylen)153{154 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);155 int err;156 157 ctx->key_size = 0;158 159 err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);160 if (err)161 return err;162 163 /* Find out new modulus size from rsa implementation */164 err = crypto_akcipher_maxsize(ctx->child);165 if (err > PAGE_SIZE)166 return -ENOTSUPP;167 168 ctx->key_size = err;169 return 0;170}171 172static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)173{174 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);175 176 /*177 * The maximum destination buffer size for the encrypt/sign operations178 * will be the same as for RSA, even though it's smaller for179 * decrypt/verify.180 */181 182 return ctx->key_size;183}184 185static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,186 struct scatterlist *next)187{188 int nsegs = next ? 2 : 1;189 190 sg_init_table(sg, nsegs);191 sg_set_buf(sg, buf, len);192 193 if (next)194 sg_chain(sg, nsegs, next);195}196 197static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)198{199 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);200 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);201 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);202 unsigned int pad_len;203 unsigned int len;204 u8 *out_buf;205 206 if (err)207 goto out;208 209 len = req_ctx->child_req.dst_len;210 pad_len = ctx->key_size - len;211 212 /* Four billion to one */213 if (likely(!pad_len))214 goto out;215 216 out_buf = kzalloc(ctx->key_size, GFP_ATOMIC);217 err = -ENOMEM;218 if (!out_buf)219 goto out;220 221 sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),222 out_buf + pad_len, len);223 sg_copy_from_buffer(req->dst,224 sg_nents_for_len(req->dst, ctx->key_size),225 out_buf, ctx->key_size);226 kfree_sensitive(out_buf);227 228out:229 req->dst_len = ctx->key_size;230 231 kfree(req_ctx->in_buf);232 233 return err;234}235 236static void pkcs1pad_encrypt_sign_complete_cb(void *data, int err)237{238 struct akcipher_request *req = data;239 240 if (err == -EINPROGRESS)241 goto out;242 243 err = pkcs1pad_encrypt_sign_complete(req, err);244 245out:246 akcipher_request_complete(req, err);247}248 249static int pkcs1pad_encrypt(struct akcipher_request *req)250{251 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);252 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);253 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);254 int err;255 unsigned int i, ps_end;256 257 if (!ctx->key_size)258 return -EINVAL;259 260 if (req->src_len > ctx->key_size - 11)261 return -EOVERFLOW;262 263 if (req->dst_len < ctx->key_size) {264 req->dst_len = ctx->key_size;265 return -EOVERFLOW;266 }267 268 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,269 GFP_KERNEL);270 if (!req_ctx->in_buf)271 return -ENOMEM;272 273 ps_end = ctx->key_size - req->src_len - 2;274 req_ctx->in_buf[0] = 0x02;275 for (i = 1; i < ps_end; i++)276 req_ctx->in_buf[i] = get_random_u32_inclusive(1, 255);277 req_ctx->in_buf[ps_end] = 0x00;278 279 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,280 ctx->key_size - 1 - req->src_len, req->src);281 282 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);283 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,284 pkcs1pad_encrypt_sign_complete_cb, req);285 286 /* Reuse output buffer */287 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,288 req->dst, ctx->key_size - 1, req->dst_len);289 290 err = crypto_akcipher_encrypt(&req_ctx->child_req);291 if (err != -EINPROGRESS && err != -EBUSY)292 return pkcs1pad_encrypt_sign_complete(req, err);293 294 return err;295}296 297static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err)298{299 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);300 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);301 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);302 unsigned int dst_len;303 unsigned int pos;304 u8 *out_buf;305 306 if (err)307 goto done;308 309 err = -EINVAL;310 dst_len = req_ctx->child_req.dst_len;311 if (dst_len < ctx->key_size - 1)312 goto done;313 314 out_buf = req_ctx->out_buf;315 if (dst_len == ctx->key_size) {316 if (out_buf[0] != 0x00)317 /* Decrypted value had no leading 0 byte */318 goto done;319 320 dst_len--;321 out_buf++;322 }323 324 if (out_buf[0] != 0x02)325 goto done;326 327 for (pos = 1; pos < dst_len; pos++)328 if (out_buf[pos] == 0x00)329 break;330 if (pos < 9 || pos == dst_len)331 goto done;332 pos++;333 334 err = 0;335 336 if (req->dst_len < dst_len - pos)337 err = -EOVERFLOW;338 req->dst_len = dst_len - pos;339 340 if (!err)341 sg_copy_from_buffer(req->dst,342 sg_nents_for_len(req->dst, req->dst_len),343 out_buf + pos, req->dst_len);344 345done:346 kfree_sensitive(req_ctx->out_buf);347 348 return err;349}350 351static void pkcs1pad_decrypt_complete_cb(void *data, int err)352{353 struct akcipher_request *req = data;354 355 if (err == -EINPROGRESS)356 goto out;357 358 err = pkcs1pad_decrypt_complete(req, err);359 360out:361 akcipher_request_complete(req, err);362}363 364static int pkcs1pad_decrypt(struct akcipher_request *req)365{366 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);367 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);368 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);369 int err;370 371 if (!ctx->key_size || req->src_len != ctx->key_size)372 return -EINVAL;373 374 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);375 if (!req_ctx->out_buf)376 return -ENOMEM;377 378 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,379 ctx->key_size, NULL);380 381 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);382 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,383 pkcs1pad_decrypt_complete_cb, req);384 385 /* Reuse input buffer, output to a new buffer */386 akcipher_request_set_crypt(&req_ctx->child_req, req->src,387 req_ctx->out_sg, req->src_len,388 ctx->key_size);389 390 err = crypto_akcipher_decrypt(&req_ctx->child_req);391 if (err != -EINPROGRESS && err != -EBUSY)392 return pkcs1pad_decrypt_complete(req, err);393 394 return err;395}396 397static int pkcs1pad_sign(struct akcipher_request *req)398{399 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);400 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);401 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);402 struct akcipher_instance *inst = akcipher_alg_instance(tfm);403 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);404 const struct rsa_asn1_template *digest_info = ictx->digest_info;405 int err;406 unsigned int ps_end, digest_info_size = 0;407 408 if (!ctx->key_size)409 return -EINVAL;410 411 if (digest_info)412 digest_info_size = digest_info->size;413 414 if (req->src_len + digest_info_size > ctx->key_size - 11)415 return -EOVERFLOW;416 417 if (req->dst_len < ctx->key_size) {418 req->dst_len = ctx->key_size;419 return -EOVERFLOW;420 }421 422 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,423 GFP_KERNEL);424 if (!req_ctx->in_buf)425 return -ENOMEM;426 427 ps_end = ctx->key_size - digest_info_size - req->src_len - 2;428 req_ctx->in_buf[0] = 0x01;429 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);430 req_ctx->in_buf[ps_end] = 0x00;431 432 if (digest_info)433 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,434 digest_info->size);435 436 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,437 ctx->key_size - 1 - req->src_len, req->src);438 439 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);440 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,441 pkcs1pad_encrypt_sign_complete_cb, req);442 443 /* Reuse output buffer */444 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,445 req->dst, ctx->key_size - 1, req->dst_len);446 447 err = crypto_akcipher_decrypt(&req_ctx->child_req);448 if (err != -EINPROGRESS && err != -EBUSY)449 return pkcs1pad_encrypt_sign_complete(req, err);450 451 return err;452}453 454static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)455{456 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);457 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);458 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);459 struct akcipher_instance *inst = akcipher_alg_instance(tfm);460 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);461 const struct rsa_asn1_template *digest_info = ictx->digest_info;462 const unsigned int sig_size = req->src_len;463 const unsigned int digest_size = req->dst_len;464 unsigned int dst_len;465 unsigned int pos;466 u8 *out_buf;467 468 if (err)469 goto done;470 471 err = -EINVAL;472 dst_len = req_ctx->child_req.dst_len;473 if (dst_len < ctx->key_size - 1)474 goto done;475 476 out_buf = req_ctx->out_buf;477 if (dst_len == ctx->key_size) {478 if (out_buf[0] != 0x00)479 /* Decrypted value had no leading 0 byte */480 goto done;481 482 dst_len--;483 out_buf++;484 }485 486 err = -EBADMSG;487 if (out_buf[0] != 0x01)488 goto done;489 490 for (pos = 1; pos < dst_len; pos++)491 if (out_buf[pos] != 0xff)492 break;493 494 if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00)495 goto done;496 pos++;497 498 if (digest_info) {499 if (digest_info->size > dst_len - pos)500 goto done;501 if (crypto_memneq(out_buf + pos, digest_info->data,502 digest_info->size))503 goto done;504 505 pos += digest_info->size;506 }507 508 err = 0;509 510 if (digest_size != dst_len - pos) {511 err = -EKEYREJECTED;512 req->dst_len = dst_len - pos;513 goto done;514 }515 /* Extract appended digest. */516 sg_pcopy_to_buffer(req->src,517 sg_nents_for_len(req->src, sig_size + digest_size),518 req_ctx->out_buf + ctx->key_size,519 digest_size, sig_size);520 /* Do the actual verification step. */521 if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos,522 digest_size) != 0)523 err = -EKEYREJECTED;524done:525 kfree_sensitive(req_ctx->out_buf);526 527 return err;528}529 530static void pkcs1pad_verify_complete_cb(void *data, int err)531{532 struct akcipher_request *req = data;533 534 if (err == -EINPROGRESS)535 goto out;536 537 err = pkcs1pad_verify_complete(req, err);538 539out:540 akcipher_request_complete(req, err);541}542 543/*544 * The verify operation is here for completeness similar to the verification545 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,546 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to547 * retrieve the DigestInfo from a signature, instead the user is expected548 * to call the sign operation to generate the expected signature and compare549 * signatures instead of the message-digests.550 */551static int pkcs1pad_verify(struct akcipher_request *req)552{553 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);554 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);555 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);556 const unsigned int sig_size = req->src_len;557 const unsigned int digest_size = req->dst_len;558 int err;559 560 if (WARN_ON(req->dst) || WARN_ON(!digest_size) ||561 !ctx->key_size || sig_size != ctx->key_size)562 return -EINVAL;563 564 req_ctx->out_buf = kmalloc(ctx->key_size + digest_size, GFP_KERNEL);565 if (!req_ctx->out_buf)566 return -ENOMEM;567 568 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,569 ctx->key_size, NULL);570 571 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);572 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,573 pkcs1pad_verify_complete_cb, req);574 575 /* Reuse input buffer, output to a new buffer */576 akcipher_request_set_crypt(&req_ctx->child_req, req->src,577 req_ctx->out_sg, sig_size, ctx->key_size);578 579 err = crypto_akcipher_encrypt(&req_ctx->child_req);580 if (err != -EINPROGRESS && err != -EBUSY)581 return pkcs1pad_verify_complete(req, err);582 583 return err;584}585 586static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)587{588 struct akcipher_instance *inst = akcipher_alg_instance(tfm);589 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);590 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);591 struct crypto_akcipher *child_tfm;592 593 child_tfm = crypto_spawn_akcipher(&ictx->spawn);594 if (IS_ERR(child_tfm))595 return PTR_ERR(child_tfm);596 597 ctx->child = child_tfm;598 599 akcipher_set_reqsize(tfm, sizeof(struct pkcs1pad_request) +600 crypto_akcipher_reqsize(child_tfm));601 602 return 0;603}604 605static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)606{607 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);608 609 crypto_free_akcipher(ctx->child);610}611 612static void pkcs1pad_free(struct akcipher_instance *inst)613{614 struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);615 struct crypto_akcipher_spawn *spawn = &ctx->spawn;616 617 crypto_drop_akcipher(spawn);618 kfree(inst);619}620 621static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)622{623 u32 mask;624 struct akcipher_instance *inst;625 struct pkcs1pad_inst_ctx *ctx;626 struct akcipher_alg *rsa_alg;627 const char *hash_name;628 int err;629 630 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask);631 if (err)632 return err;633 634 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);635 if (!inst)636 return -ENOMEM;637 638 ctx = akcipher_instance_ctx(inst);639 640 err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst),641 crypto_attr_alg_name(tb[1]), 0, mask);642 if (err)643 goto err_free_inst;644 645 rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);646 647 if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) {648 err = -EINVAL;649 goto err_free_inst;650 }651 652 err = -ENAMETOOLONG;653 hash_name = crypto_attr_alg_name(tb[2]);654 if (IS_ERR(hash_name)) {655 if (snprintf(inst->alg.base.cra_name,656 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",657 rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)658 goto err_free_inst;659 660 if (snprintf(inst->alg.base.cra_driver_name,661 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",662 rsa_alg->base.cra_driver_name) >=663 CRYPTO_MAX_ALG_NAME)664 goto err_free_inst;665 } else {666 ctx->digest_info = rsa_lookup_asn1(hash_name);667 if (!ctx->digest_info) {668 err = -EINVAL;669 goto err_free_inst;670 }671 672 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,673 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name,674 hash_name) >= CRYPTO_MAX_ALG_NAME)675 goto err_free_inst;676 677 if (snprintf(inst->alg.base.cra_driver_name,678 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",679 rsa_alg->base.cra_driver_name,680 hash_name) >= CRYPTO_MAX_ALG_NAME)681 goto err_free_inst;682 }683 684 inst->alg.base.cra_priority = rsa_alg->base.cra_priority;685 inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);686 687 inst->alg.init = pkcs1pad_init_tfm;688 inst->alg.exit = pkcs1pad_exit_tfm;689 690 inst->alg.encrypt = pkcs1pad_encrypt;691 inst->alg.decrypt = pkcs1pad_decrypt;692 inst->alg.sign = pkcs1pad_sign;693 inst->alg.verify = pkcs1pad_verify;694 inst->alg.set_pub_key = pkcs1pad_set_pub_key;695 inst->alg.set_priv_key = pkcs1pad_set_priv_key;696 inst->alg.max_size = pkcs1pad_get_max_size;697 698 inst->free = pkcs1pad_free;699 700 err = akcipher_register_instance(tmpl, inst);701 if (err) {702err_free_inst:703 pkcs1pad_free(inst);704 }705 return err;706}707 708struct crypto_template rsa_pkcs1pad_tmpl = {709 .name = "pkcs1pad",710 .create = pkcs1pad_create,711 .module = THIS_MODULE,712};713 714MODULE_ALIAS_CRYPTO("pkcs1pad");715