Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 2 | /* |
| 3 | * RSA padding templates. |
| 4 | * |
| 5 | * Copyright (c) 2015 Intel Corporation |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <crypto/algapi.h> |
| 9 | #include <crypto/akcipher.h> |
| 10 | #include <crypto/internal/akcipher.h> |
Eric Biggers | a1180cf | 2019-01-10 12:17:53 -0800 | [diff] [blame] | 11 | #include <crypto/internal/rsa.h> |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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> |
Herbert Xu | 0c3dc78 | 2020-08-19 21:58:20 +1000 | [diff] [blame] | 17 | #include <linux/scatterlist.h> |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 18 | |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 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 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 91 | struct pkcs1pad_ctx { |
| 92 | struct crypto_akcipher *child; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 93 | unsigned int key_size; |
| 94 | }; |
| 95 | |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 96 | struct pkcs1pad_inst_ctx { |
| 97 | struct crypto_akcipher_spawn spawn; |
Herbert Xu | c0d20d2 | 2016-06-29 19:32:23 +0800 | [diff] [blame] | 98 | const struct rsa_asn1_template *digest_info; |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 99 | }; |
| 100 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 101 | struct pkcs1pad_request { |
Herbert Xu | 0f2c831 | 2016-06-29 19:32:24 +0800 | [diff] [blame] | 102 | struct scatterlist in_sg[2], out_sg[1]; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 103 | uint8_t *in_buf, *out_buf; |
Tadeusz Struk | a6d7bfd | 2016-07-14 20:39:18 -0700 | [diff] [blame] | 104 | struct akcipher_request child_req; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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); |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 111 | int err; |
| 112 | |
| 113 | ctx->key_size = 0; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 114 | |
| 115 | err = crypto_akcipher_set_pub_key(ctx->child, key, keylen); |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 116 | if (err) |
| 117 | return err; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 118 | |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 119 | /* Find out new modulus size from rsa implementation */ |
| 120 | err = crypto_akcipher_maxsize(ctx->child); |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 121 | if (err > PAGE_SIZE) |
| 122 | return -ENOTSUPP; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 123 | |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 124 | ctx->key_size = err; |
| 125 | return 0; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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); |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 132 | int err; |
| 133 | |
| 134 | ctx->key_size = 0; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 135 | |
| 136 | err = crypto_akcipher_set_priv_key(ctx->child, key, keylen); |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 137 | if (err) |
| 138 | return err; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 139 | |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 140 | /* Find out new modulus size from rsa implementation */ |
| 141 | err = crypto_akcipher_maxsize(ctx->child); |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 142 | if (err > PAGE_SIZE) |
| 143 | return -ENOTSUPP; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 144 | |
Herbert Xu | 73f79189 | 2016-06-29 19:32:27 +0800 | [diff] [blame] | 145 | ctx->key_size = err; |
| 146 | return 0; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 147 | } |
| 148 | |
Tudor-Dan Ambarus | 543de10 | 2017-05-25 10:18:16 +0300 | [diff] [blame] | 149 | static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | |
Tudor-Dan Ambarus | 543de10 | 2017-05-25 10:18:16 +0300 | [diff] [blame] | 159 | return ctx->key_size; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len, |
| 163 | struct scatterlist *next) |
| 164 | { |
Herbert Xu | 0f2c831 | 2016-06-29 19:32:24 +0800 | [diff] [blame] | 165 | int nsegs = next ? 2 : 1; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 166 | |
Herbert Xu | 0f2c831 | 2016-06-29 19:32:24 +0800 | [diff] [blame] | 167 | sg_init_table(sg, nsegs); |
| 168 | sg_set_buf(sg, buf, len); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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); |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 179 | unsigned int pad_len; |
| 180 | unsigned int len; |
| 181 | u8 *out_buf; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 182 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 183 | if (err) |
| 184 | goto out; |
Andrzej Zaborowski | 5319216 | 2015-12-12 00:03:51 -0500 | [diff] [blame] | 185 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 186 | len = req_ctx->child_req.dst_len; |
| 187 | pad_len = ctx->key_size - len; |
Andrzej Zaborowski | 5319216 | 2015-12-12 00:03:51 -0500 | [diff] [blame] | 188 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 189 | /* Four billion to one */ |
| 190 | if (likely(!pad_len)) |
| 191 | goto out; |
Andrzej Zaborowski | 5319216 | 2015-12-12 00:03:51 -0500 | [diff] [blame] | 192 | |
Herbert Xu | d52b0c7 | 2023-01-23 18:08:56 +0800 | [diff] [blame] | 193 | out_buf = kzalloc(ctx->key_size, GFP_ATOMIC); |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 194 | err = -ENOMEM; |
| 195 | if (!out_buf) |
| 196 | goto out; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 197 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 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); |
Waiman Long | 453431a | 2020-08-06 23:18:13 -0700 | [diff] [blame] | 203 | kfree_sensitive(out_buf); |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 204 | |
| 205 | out: |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 206 | req->dst_len = ctx->key_size; |
| 207 | |
| 208 | kfree(req_ctx->in_buf); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 209 | |
| 210 | return err; |
| 211 | } |
| 212 | |
Herbert Xu | 255e48e | 2023-02-08 13:58:44 +0800 | [diff] [blame] | 213 | static void pkcs1pad_encrypt_sign_complete_cb(void *data, int err) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 214 | { |
Herbert Xu | 255e48e | 2023-02-08 13:58:44 +0800 | [diff] [blame] | 215 | struct akcipher_request *req = data; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 216 | |
| 217 | if (err == -EINPROGRESS) |
Herbert Xu | 564cabc | 2023-01-31 16:02:04 +0800 | [diff] [blame] | 218 | goto out; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 219 | |
Herbert Xu | 564cabc | 2023-01-31 16:02:04 +0800 | [diff] [blame] | 220 | err = pkcs1pad_encrypt_sign_complete(req, err); |
| 221 | |
| 222 | out: |
| 223 | akcipher_request_complete(req, err); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | static 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 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 245 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, |
Herbert Xu | 3a32ce5 | 2016-06-29 19:32:26 +0800 | [diff] [blame] | 246 | GFP_KERNEL); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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++) |
Jason A. Donenfeld | e8a533c | 2022-10-09 20:44:02 -0600 | [diff] [blame] | 253 | req_ctx->in_buf[i] = get_random_u32_inclusive(1, 255); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 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 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 267 | err = crypto_akcipher_encrypt(&req_ctx->child_req); |
Gilad Ben-Yossef | 4e5b0ad | 2017-10-18 08:00:36 +0100 | [diff] [blame] | 268 | if (err != -EINPROGRESS && err != -EBUSY) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 269 | return pkcs1pad_encrypt_sign_complete(req, err); |
| 270 | |
| 271 | return err; |
| 272 | } |
| 273 | |
| 274 | static 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); |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 279 | unsigned int dst_len; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 280 | unsigned int pos; |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 281 | u8 *out_buf; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 282 | |
| 283 | if (err) |
| 284 | goto done; |
| 285 | |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 286 | err = -EINVAL; |
| 287 | dst_len = req_ctx->child_req.dst_len; |
| 288 | if (dst_len < ctx->key_size - 1) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 289 | goto done; |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 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++; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 299 | } |
| 300 | |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 301 | if (out_buf[0] != 0x02) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 302 | goto done; |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 303 | |
| 304 | for (pos = 1; pos < dst_len; pos++) |
| 305 | if (out_buf[pos] == 0x00) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 306 | break; |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 307 | if (pos < 9 || pos == dst_len) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 308 | goto done; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 309 | pos++; |
| 310 | |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 311 | err = 0; |
| 312 | |
| 313 | if (req->dst_len < dst_len - pos) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 314 | err = -EOVERFLOW; |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 315 | req->dst_len = dst_len - pos; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 316 | |
| 317 | if (!err) |
| 318 | sg_copy_from_buffer(req->dst, |
| 319 | sg_nents_for_len(req->dst, req->dst_len), |
Herbert Xu | 0cf43f5 | 2016-09-22 17:04:57 +0800 | [diff] [blame] | 320 | out_buf + pos, req->dst_len); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 321 | |
| 322 | done: |
Waiman Long | 453431a | 2020-08-06 23:18:13 -0700 | [diff] [blame] | 323 | kfree_sensitive(req_ctx->out_buf); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 324 | |
| 325 | return err; |
| 326 | } |
| 327 | |
Herbert Xu | 255e48e | 2023-02-08 13:58:44 +0800 | [diff] [blame] | 328 | static void pkcs1pad_decrypt_complete_cb(void *data, int err) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 329 | { |
Herbert Xu | 255e48e | 2023-02-08 13:58:44 +0800 | [diff] [blame] | 330 | struct akcipher_request *req = data; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 331 | |
| 332 | if (err == -EINPROGRESS) |
Herbert Xu | 564cabc | 2023-01-31 16:02:04 +0800 | [diff] [blame] | 333 | goto out; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 334 | |
Herbert Xu | 564cabc | 2023-01-31 16:02:04 +0800 | [diff] [blame] | 335 | err = pkcs1pad_decrypt_complete(req, err); |
| 336 | |
| 337 | out: |
| 338 | akcipher_request_complete(req, err); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 339 | } |
| 340 | |
| 341 | static 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 | |
Herbert Xu | 3a32ce5 | 2016-06-29 19:32:26 +0800 | [diff] [blame] | 351 | req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 352 | if (!req_ctx->out_buf) |
| 353 | return -ENOMEM; |
| 354 | |
| 355 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, |
Tadeusz Struk | 6f0904a | 2016-04-06 14:42:32 -0700 | [diff] [blame] | 356 | ctx->key_size, NULL); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 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 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 367 | err = crypto_akcipher_decrypt(&req_ctx->child_req); |
Gilad Ben-Yossef | 4e5b0ad | 2017-10-18 08:00:36 +0100 | [diff] [blame] | 368 | if (err != -EINPROGRESS && err != -EBUSY) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 369 | return pkcs1pad_decrypt_complete(req, err); |
| 370 | |
| 371 | return err; |
| 372 | } |
| 373 | |
| 374 | static 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); |
Herbert Xu | c0d20d2 | 2016-06-29 19:32:23 +0800 | [diff] [blame] | 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; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 382 | int err; |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 383 | unsigned int ps_end, digest_info_size = 0; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 384 | |
| 385 | if (!ctx->key_size) |
| 386 | return -EINVAL; |
| 387 | |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 388 | if (digest_info) |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 389 | digest_info_size = digest_info->size; |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 390 | |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 391 | if (req->src_len + digest_info_size > ctx->key_size - 11) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 392 | return -EOVERFLOW; |
| 393 | |
| 394 | if (req->dst_len < ctx->key_size) { |
| 395 | req->dst_len = ctx->key_size; |
| 396 | return -EOVERFLOW; |
| 397 | } |
| 398 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 399 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, |
Herbert Xu | 3a32ce5 | 2016-06-29 19:32:26 +0800 | [diff] [blame] | 400 | GFP_KERNEL); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 401 | if (!req_ctx->in_buf) |
| 402 | return -ENOMEM; |
| 403 | |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 404 | ps_end = ctx->key_size - digest_info_size - req->src_len - 2; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 409 | if (digest_info) |
| 410 | memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data, |
| 411 | digest_info->size); |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 412 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 413 | pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, |
| 414 | ctx->key_size - 1 - req->src_len, req->src); |
| 415 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 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 | |
Vitaly Chikunov | 3ecc972 | 2019-04-11 18:51:14 +0300 | [diff] [blame] | 424 | err = crypto_akcipher_decrypt(&req_ctx->child_req); |
Gilad Ben-Yossef | 4e5b0ad | 2017-10-18 08:00:36 +0100 | [diff] [blame] | 425 | if (err != -EINPROGRESS && err != -EBUSY) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 426 | return pkcs1pad_encrypt_sign_complete(req, err); |
| 427 | |
| 428 | return err; |
| 429 | } |
| 430 | |
| 431 | static 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); |
Herbert Xu | c0d20d2 | 2016-06-29 19:32:23 +0800 | [diff] [blame] | 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; |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 439 | const unsigned int sig_size = req->src_len; |
| 440 | const unsigned int digest_size = req->dst_len; |
Herbert Xu | 27710b8 | 2016-07-03 10:46:11 +0800 | [diff] [blame] | 441 | unsigned int dst_len; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 442 | unsigned int pos; |
Herbert Xu | 27710b8 | 2016-07-03 10:46:11 +0800 | [diff] [blame] | 443 | u8 *out_buf; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 444 | |
| 445 | if (err) |
| 446 | goto done; |
| 447 | |
Herbert Xu | 27710b8 | 2016-07-03 10:46:11 +0800 | [diff] [blame] | 448 | err = -EINVAL; |
| 449 | dst_len = req_ctx->child_req.dst_len; |
| 450 | if (dst_len < ctx->key_size - 1) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 451 | goto done; |
Herbert Xu | 27710b8 | 2016-07-03 10:46:11 +0800 | [diff] [blame] | 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++; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 461 | } |
| 462 | |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 463 | err = -EBADMSG; |
Herbert Xu | 27710b8 | 2016-07-03 10:46:11 +0800 | [diff] [blame] | 464 | if (out_buf[0] != 0x01) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 465 | goto done; |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 466 | |
Herbert Xu | 27710b8 | 2016-07-03 10:46:11 +0800 | [diff] [blame] | 467 | for (pos = 1; pos < dst_len; pos++) |
| 468 | if (out_buf[pos] != 0xff) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 469 | break; |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 470 | |
Herbert Xu | 27710b8 | 2016-07-03 10:46:11 +0800 | [diff] [blame] | 471 | if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 472 | goto done; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 473 | pos++; |
| 474 | |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 475 | if (digest_info) { |
Eric Biggers | a24611e | 2022-01-18 16:13:05 -0800 | [diff] [blame] | 476 | if (digest_info->size > dst_len - pos) |
| 477 | goto done; |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 478 | if (crypto_memneq(out_buf + pos, digest_info->data, |
| 479 | digest_info->size)) |
| 480 | goto done; |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 481 | |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 482 | pos += digest_info->size; |
| 483 | } |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 484 | |
| 485 | err = 0; |
| 486 | |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 487 | if (digest_size != dst_len - pos) { |
Vitaly Chikunov | c7381b0 | 2019-04-11 18:51:15 +0300 | [diff] [blame] | 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, |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 494 | sg_nents_for_len(req->src, sig_size + digest_size), |
Vitaly Chikunov | c7381b0 | 2019-04-11 18:51:15 +0300 | [diff] [blame] | 495 | req_ctx->out_buf + ctx->key_size, |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 496 | digest_size, sig_size); |
Vitaly Chikunov | c7381b0 | 2019-04-11 18:51:15 +0300 | [diff] [blame] | 497 | /* Do the actual verification step. */ |
| 498 | if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos, |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 499 | digest_size) != 0) |
Vitaly Chikunov | c7381b0 | 2019-04-11 18:51:15 +0300 | [diff] [blame] | 500 | err = -EKEYREJECTED; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 501 | done: |
Waiman Long | 453431a | 2020-08-06 23:18:13 -0700 | [diff] [blame] | 502 | kfree_sensitive(req_ctx->out_buf); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 503 | |
| 504 | return err; |
| 505 | } |
| 506 | |
Herbert Xu | 255e48e | 2023-02-08 13:58:44 +0800 | [diff] [blame] | 507 | static void pkcs1pad_verify_complete_cb(void *data, int err) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 508 | { |
Herbert Xu | 255e48e | 2023-02-08 13:58:44 +0800 | [diff] [blame] | 509 | struct akcipher_request *req = data; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 510 | |
| 511 | if (err == -EINPROGRESS) |
Herbert Xu | 564cabc | 2023-01-31 16:02:04 +0800 | [diff] [blame] | 512 | goto out; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 513 | |
Herbert Xu | 564cabc | 2023-01-31 16:02:04 +0800 | [diff] [blame] | 514 | err = pkcs1pad_verify_complete(req, err); |
| 515 | |
| 516 | out: |
| 517 | akcipher_request_complete(req, err); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | */ |
| 528 | static 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); |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 533 | const unsigned int sig_size = req->src_len; |
| 534 | const unsigned int digest_size = req->dst_len; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 535 | int err; |
| 536 | |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 537 | if (WARN_ON(req->dst) || WARN_ON(!digest_size) || |
| 538 | !ctx->key_size || sig_size != ctx->key_size) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 539 | return -EINVAL; |
| 540 | |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 541 | req_ctx->out_buf = kmalloc(ctx->key_size + digest_size, GFP_KERNEL); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 542 | if (!req_ctx->out_buf) |
| 543 | return -ENOMEM; |
| 544 | |
| 545 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, |
Tadeusz Struk | 6f0904a | 2016-04-06 14:42:32 -0700 | [diff] [blame] | 546 | ctx->key_size, NULL); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 552 | /* Reuse input buffer, output to a new buffer */ |
| 553 | akcipher_request_set_crypt(&req_ctx->child_req, req->src, |
Eric Biggers | c2a28fd | 2022-01-18 16:13:06 -0800 | [diff] [blame] | 554 | req_ctx->out_sg, sig_size, ctx->key_size); |
Herbert Xu | d858b07 | 2016-06-29 19:32:28 +0800 | [diff] [blame] | 555 | |
Vitaly Chikunov | 3ecc972 | 2019-04-11 18:51:14 +0300 | [diff] [blame] | 556 | err = crypto_akcipher_encrypt(&req_ctx->child_req); |
Gilad Ben-Yossef | 4e5b0ad | 2017-10-18 08:00:36 +0100 | [diff] [blame] | 557 | if (err != -EINPROGRESS && err != -EBUSY) |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 558 | return pkcs1pad_verify_complete(req, err); |
| 559 | |
| 560 | return err; |
| 561 | } |
| 562 | |
| 563 | static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) |
| 564 | { |
| 565 | struct akcipher_instance *inst = akcipher_alg_instance(tfm); |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 566 | struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 567 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
| 568 | struct crypto_akcipher *child_tfm; |
| 569 | |
Herbert Xu | c0d20d2 | 2016-06-29 19:32:23 +0800 | [diff] [blame] | 570 | child_tfm = crypto_spawn_akcipher(&ictx->spawn); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 571 | if (IS_ERR(child_tfm)) |
| 572 | return PTR_ERR(child_tfm); |
| 573 | |
| 574 | ctx->child = child_tfm; |
Herbert Xu | 5b11d1a | 2022-11-22 13:53:38 +0800 | [diff] [blame] | 575 | |
| 576 | akcipher_set_reqsize(tfm, sizeof(struct pkcs1pad_request) + |
| 577 | crypto_akcipher_reqsize(child_tfm)); |
| 578 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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 | { |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 591 | struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst); |
| 592 | struct crypto_akcipher_spawn *spawn = &ctx->spawn; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 593 | |
| 594 | crypto_drop_akcipher(spawn); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 595 | kfree(inst); |
| 596 | } |
| 597 | |
| 598 | static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb) |
| 599 | { |
Eric Biggers | 73bed26 | 2020-01-02 19:58:47 -0800 | [diff] [blame] | 600 | u32 mask; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 601 | struct akcipher_instance *inst; |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 602 | struct pkcs1pad_inst_ctx *ctx; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 603 | struct akcipher_alg *rsa_alg; |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 604 | const char *hash_name; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 605 | int err; |
| 606 | |
Eric Biggers | 7bcb2c9 | 2020-07-09 23:20:38 -0700 | [diff] [blame] | 607 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask); |
| 608 | if (err) |
| 609 | return err; |
Eric Biggers | 73bed26 | 2020-01-02 19:58:47 -0800 | [diff] [blame] | 610 | |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 611 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 612 | if (!inst) |
| 613 | return -ENOMEM; |
| 614 | |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 615 | ctx = akcipher_instance_ctx(inst); |
Tadeusz Struk | a49de37 | 2016-03-03 21:49:26 +0000 | [diff] [blame] | 616 | |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 617 | err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst), |
| 618 | crypto_attr_alg_name(tb[1]), 0, mask); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 619 | if (err) |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 620 | goto err_free_inst; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 621 | |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 622 | rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn); |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 623 | |
Eric Biggers | 9b30430 | 2022-01-18 16:13:02 -0800 | [diff] [blame] | 624 | if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) { |
| 625 | err = -EINVAL; |
| 626 | goto err_free_inst; |
| 627 | } |
| 628 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 629 | err = -ENAMETOOLONG; |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 630 | hash_name = crypto_attr_alg_name(tb[2]); |
| 631 | if (IS_ERR(hash_name)) { |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 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) |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 635 | goto err_free_inst; |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 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) |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 641 | goto err_free_inst; |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 642 | } else { |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 643 | ctx->digest_info = rsa_lookup_asn1(hash_name); |
| 644 | if (!ctx->digest_info) { |
| 645 | err = -EINVAL; |
| 646 | goto err_free_inst; |
| 647 | } |
| 648 | |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 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) |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 652 | goto err_free_inst; |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 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) |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 658 | goto err_free_inst; |
Denis Kenzior | b3a8c8a | 2018-10-09 17:47:53 +0100 | [diff] [blame] | 659 | } |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 660 | |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 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; |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 674 | |
| 675 | inst->free = pkcs1pad_free; |
| 676 | |
| 677 | err = akcipher_register_instance(tmpl, inst); |
Eric Biggers | 0708bb4 | 2020-02-25 20:59:23 -0800 | [diff] [blame] | 678 | if (err) { |
| 679 | err_free_inst: |
| 680 | pkcs1pad_free(inst); |
| 681 | } |
Andrzej Zaborowski | 3d5b1ec | 2015-12-05 17:09:34 +0100 | [diff] [blame] | 682 | return err; |
| 683 | } |
| 684 | |
| 685 | struct crypto_template rsa_pkcs1pad_tmpl = { |
| 686 | .name = "pkcs1pad", |
| 687 | .create = pkcs1pad_create, |
| 688 | .module = THIS_MODULE, |
| 689 | }; |