Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 1 | /* |
| 2 | * QEMU Crypto akcipher algorithms |
| 3 | * |
| 4 | * Copyright (c) 2022 Bytedance |
| 5 | * Author: lei he <helei.sig11@bytedance.com> |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <gcrypt.h> |
| 23 | |
| 24 | #include "qemu/osdep.h" |
| 25 | #include "qemu/host-utils.h" |
| 26 | #include "crypto/akcipher.h" |
| 27 | #include "crypto/random.h" |
| 28 | #include "qapi/error.h" |
| 29 | #include "sysemu/cryptodev.h" |
| 30 | #include "rsakey.h" |
| 31 | |
| 32 | typedef struct QCryptoGcryptRSA { |
| 33 | QCryptoAkCipher akcipher; |
| 34 | gcry_sexp_t key; |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 35 | QCryptoRSAPaddingAlgo padding_alg; |
Markus Armbruster | ef834aa | 2024-09-04 13:18:28 +0200 | [diff] [blame] | 36 | QCryptoHashAlgo hash_alg; |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 37 | } QCryptoGcryptRSA; |
| 38 | |
| 39 | static void qcrypto_gcrypt_rsa_free(QCryptoAkCipher *akcipher) |
| 40 | { |
| 41 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; |
| 42 | if (!rsa) { |
| 43 | return; |
| 44 | } |
| 45 | |
| 46 | gcry_sexp_release(rsa->key); |
| 47 | g_free(rsa); |
| 48 | } |
| 49 | |
| 50 | static QCryptoGcryptRSA *qcrypto_gcrypt_rsa_new( |
| 51 | const QCryptoAkCipherOptionsRSA *opt, |
| 52 | QCryptoAkCipherKeyType type, |
| 53 | const uint8_t *key, size_t keylen, |
| 54 | Error **errp); |
| 55 | |
| 56 | QCryptoAkCipher *qcrypto_akcipher_new(const QCryptoAkCipherOptions *opts, |
| 57 | QCryptoAkCipherKeyType type, |
| 58 | const uint8_t *key, size_t keylen, |
| 59 | Error **errp) |
| 60 | { |
| 61 | switch (opts->alg) { |
Markus Armbruster | cd48d82 | 2024-09-04 13:18:31 +0200 | [diff] [blame] | 62 | case QCRYPTO_AK_CIPHER_ALGO_RSA: |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 63 | return (QCryptoAkCipher *)qcrypto_gcrypt_rsa_new( |
| 64 | &opts->u.rsa, type, key, keylen, errp); |
| 65 | |
| 66 | default: |
| 67 | error_setg(errp, "Unsupported algorithm: %u", opts->alg); |
| 68 | return NULL; |
| 69 | } |
| 70 | |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | static void qcrypto_gcrypt_set_rsa_size(QCryptoAkCipher *akcipher, gcry_mpi_t n) |
| 75 | { |
| 76 | size_t key_size = (gcry_mpi_get_nbits(n) + 7) / 8; |
| 77 | akcipher->max_plaintext_len = key_size; |
| 78 | akcipher->max_ciphertext_len = key_size; |
| 79 | akcipher->max_dgst_len = key_size; |
| 80 | akcipher->max_signature_len = key_size; |
| 81 | } |
| 82 | |
| 83 | static int qcrypto_gcrypt_parse_rsa_private_key( |
| 84 | QCryptoGcryptRSA *rsa, |
| 85 | const uint8_t *key, size_t keylen, Error **errp) |
| 86 | { |
| 87 | g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse( |
Markus Armbruster | 5f4059e | 2024-09-04 13:18:27 +0200 | [diff] [blame] | 88 | QCRYPTO_AK_CIPHER_KEY_TYPE_PRIVATE, key, keylen, errp); |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 89 | gcry_mpi_t n = NULL, e = NULL, d = NULL, p = NULL, q = NULL, u = NULL; |
| 90 | bool compute_mul_inv = false; |
| 91 | int ret = -1; |
| 92 | gcry_error_t err; |
| 93 | |
| 94 | if (!rsa_key) { |
| 95 | return ret; |
| 96 | } |
| 97 | |
| 98 | err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD, |
| 99 | rsa_key->n.data, rsa_key->n.len, NULL); |
| 100 | if (gcry_err_code(err) != 0) { |
| 101 | error_setg(errp, "Failed to parse RSA parameter n: %s/%s", |
| 102 | gcry_strsource(err), gcry_strerror(err)); |
| 103 | goto cleanup; |
| 104 | } |
| 105 | |
| 106 | err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD, |
| 107 | rsa_key->e.data, rsa_key->e.len, NULL); |
| 108 | if (gcry_err_code(err) != 0) { |
| 109 | error_setg(errp, "Failed to parse RSA parameter e: %s/%s", |
| 110 | gcry_strsource(err), gcry_strerror(err)); |
| 111 | goto cleanup; |
| 112 | } |
| 113 | |
| 114 | err = gcry_mpi_scan(&d, GCRYMPI_FMT_STD, |
| 115 | rsa_key->d.data, rsa_key->d.len, NULL); |
| 116 | if (gcry_err_code(err) != 0) { |
| 117 | error_setg(errp, "Failed to parse RSA parameter d: %s/%s", |
| 118 | gcry_strsource(err), gcry_strerror(err)); |
| 119 | goto cleanup; |
| 120 | } |
| 121 | |
| 122 | err = gcry_mpi_scan(&p, GCRYMPI_FMT_STD, |
| 123 | rsa_key->p.data, rsa_key->p.len, NULL); |
| 124 | if (gcry_err_code(err) != 0) { |
| 125 | error_setg(errp, "Failed to parse RSA parameter p: %s/%s", |
| 126 | gcry_strsource(err), gcry_strerror(err)); |
| 127 | goto cleanup; |
| 128 | } |
| 129 | |
| 130 | err = gcry_mpi_scan(&q, GCRYMPI_FMT_STD, |
| 131 | rsa_key->q.data, rsa_key->q.len, NULL); |
| 132 | if (gcry_err_code(err) != 0) { |
| 133 | error_setg(errp, "Failed to parse RSA parameter q: %s/%s", |
| 134 | gcry_strsource(err), gcry_strerror(err)); |
| 135 | goto cleanup; |
| 136 | } |
| 137 | |
| 138 | if (gcry_mpi_cmp_ui(p, 0) > 0 && gcry_mpi_cmp_ui(q, 0) > 0) { |
| 139 | compute_mul_inv = true; |
| 140 | |
| 141 | u = gcry_mpi_new(0); |
| 142 | if (gcry_mpi_cmp(p, q) > 0) { |
| 143 | gcry_mpi_swap(p, q); |
| 144 | } |
| 145 | gcry_mpi_invm(u, p, q); |
| 146 | } |
| 147 | |
| 148 | if (compute_mul_inv) { |
| 149 | err = gcry_sexp_build(&rsa->key, NULL, |
| 150 | "(private-key (rsa (n %m) (e %m) (d %m) (p %m) (q %m) (u %m)))", |
| 151 | n, e, d, p, q, u); |
| 152 | } else { |
| 153 | err = gcry_sexp_build(&rsa->key, NULL, |
| 154 | "(private-key (rsa (n %m) (e %m) (d %m)))", n, e, d); |
| 155 | } |
| 156 | if (gcry_err_code(err) != 0) { |
| 157 | error_setg(errp, "Failed to build RSA private key: %s/%s", |
| 158 | gcry_strsource(err), gcry_strerror(err)); |
| 159 | goto cleanup; |
| 160 | } |
| 161 | qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n); |
| 162 | ret = 0; |
| 163 | |
| 164 | cleanup: |
| 165 | gcry_mpi_release(n); |
| 166 | gcry_mpi_release(e); |
| 167 | gcry_mpi_release(d); |
| 168 | gcry_mpi_release(p); |
| 169 | gcry_mpi_release(q); |
| 170 | gcry_mpi_release(u); |
| 171 | return ret; |
| 172 | } |
| 173 | |
| 174 | static int qcrypto_gcrypt_parse_rsa_public_key(QCryptoGcryptRSA *rsa, |
| 175 | const uint8_t *key, |
| 176 | size_t keylen, |
| 177 | Error **errp) |
| 178 | { |
| 179 | |
| 180 | g_autoptr(QCryptoAkCipherRSAKey) rsa_key = qcrypto_akcipher_rsakey_parse( |
Markus Armbruster | 5f4059e | 2024-09-04 13:18:27 +0200 | [diff] [blame] | 181 | QCRYPTO_AK_CIPHER_KEY_TYPE_PUBLIC, key, keylen, errp); |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 182 | gcry_mpi_t n = NULL, e = NULL; |
| 183 | int ret = -1; |
| 184 | gcry_error_t err; |
| 185 | |
| 186 | if (!rsa_key) { |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | err = gcry_mpi_scan(&n, GCRYMPI_FMT_STD, |
| 191 | rsa_key->n.data, rsa_key->n.len, NULL); |
| 192 | if (gcry_err_code(err) != 0) { |
| 193 | error_setg(errp, "Failed to parse RSA parameter n: %s/%s", |
| 194 | gcry_strsource(err), gcry_strerror(err)); |
| 195 | goto cleanup; |
| 196 | } |
| 197 | |
| 198 | err = gcry_mpi_scan(&e, GCRYMPI_FMT_STD, |
| 199 | rsa_key->e.data, rsa_key->e.len, NULL); |
| 200 | if (gcry_err_code(err) != 0) { |
| 201 | error_setg(errp, "Failed to parse RSA parameter e: %s/%s", |
| 202 | gcry_strsource(err), gcry_strerror(err)); |
| 203 | goto cleanup; |
| 204 | } |
| 205 | |
| 206 | err = gcry_sexp_build(&rsa->key, NULL, |
| 207 | "(public-key (rsa (n %m) (e %m)))", n, e); |
| 208 | if (gcry_err_code(err) != 0) { |
| 209 | error_setg(errp, "Failed to build RSA public key: %s/%s", |
| 210 | gcry_strsource(err), gcry_strerror(err)); |
| 211 | goto cleanup; |
| 212 | } |
| 213 | qcrypto_gcrypt_set_rsa_size((QCryptoAkCipher *)rsa, n); |
| 214 | ret = 0; |
| 215 | |
| 216 | cleanup: |
| 217 | gcry_mpi_release(n); |
| 218 | gcry_mpi_release(e); |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | static int qcrypto_gcrypt_rsa_encrypt(QCryptoAkCipher *akcipher, |
| 223 | const void *in, size_t in_len, |
| 224 | void *out, size_t out_len, |
| 225 | Error **errp) |
| 226 | { |
| 227 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; |
| 228 | int ret = -1; |
| 229 | gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL; |
| 230 | gcry_sexp_t cipher_sexp_item = NULL; |
| 231 | gcry_mpi_t cipher_mpi = NULL; |
| 232 | const char *result; |
| 233 | gcry_error_t err; |
| 234 | size_t actual_len; |
| 235 | |
| 236 | if (in_len > akcipher->max_plaintext_len) { |
| 237 | error_setg(errp, "Plaintext length is greater than key size: %d", |
| 238 | akcipher->max_plaintext_len); |
| 239 | return ret; |
| 240 | } |
| 241 | |
| 242 | err = gcry_sexp_build(&data_sexp, NULL, |
| 243 | "(data (flags %s) (value %b))", |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 244 | QCryptoRSAPaddingAlgo_str(rsa->padding_alg), |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 245 | in_len, in); |
| 246 | if (gcry_err_code(err) != 0) { |
| 247 | error_setg(errp, "Failed to build plaintext: %s/%s", |
| 248 | gcry_strsource(err), gcry_strerror(err)); |
| 249 | goto cleanup; |
| 250 | } |
| 251 | |
| 252 | err = gcry_pk_encrypt(&cipher_sexp, data_sexp, rsa->key); |
| 253 | if (gcry_err_code(err) != 0) { |
| 254 | error_setg(errp, "Failed to encrypt: %s/%s", |
| 255 | gcry_strsource(err), gcry_strerror(err)); |
| 256 | goto cleanup; |
| 257 | } |
| 258 | |
| 259 | /* S-expression of cipher: (enc-val (rsa (a a-mpi))) */ |
| 260 | cipher_sexp_item = gcry_sexp_find_token(cipher_sexp, "a", 0); |
| 261 | if (!cipher_sexp_item || gcry_sexp_length(cipher_sexp_item) != 2) { |
| 262 | error_setg(errp, "Invalid ciphertext result"); |
| 263 | goto cleanup; |
| 264 | } |
| 265 | |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 266 | if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALGO_RAW) { |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 267 | cipher_mpi = gcry_sexp_nth_mpi(cipher_sexp_item, 1, GCRYMPI_FMT_USG); |
| 268 | if (!cipher_mpi) { |
| 269 | error_setg(errp, "Invalid ciphertext result"); |
| 270 | goto cleanup; |
| 271 | } |
| 272 | err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len, |
| 273 | &actual_len, cipher_mpi); |
| 274 | if (gcry_err_code(err) != 0) { |
| 275 | error_setg(errp, "Failed to print MPI: %s/%s", |
| 276 | gcry_strsource(err), gcry_strerror(err)); |
| 277 | goto cleanup; |
| 278 | } |
| 279 | |
| 280 | if (actual_len > out_len) { |
| 281 | error_setg(errp, "Ciphertext buffer length is too small"); |
| 282 | goto cleanup; |
| 283 | } |
| 284 | |
| 285 | /* We always padding leading-zeros for RSA-RAW */ |
| 286 | if (actual_len < out_len) { |
| 287 | memmove((uint8_t *)out + (out_len - actual_len), out, actual_len); |
| 288 | memset(out, 0, out_len - actual_len); |
| 289 | } |
| 290 | ret = out_len; |
| 291 | |
| 292 | } else { |
| 293 | result = gcry_sexp_nth_data(cipher_sexp_item, 1, &actual_len); |
| 294 | if (!result) { |
| 295 | error_setg(errp, "Invalid ciphertext result"); |
| 296 | goto cleanup; |
| 297 | } |
| 298 | if (actual_len > out_len) { |
| 299 | error_setg(errp, "Ciphertext buffer length is too small"); |
| 300 | goto cleanup; |
| 301 | } |
| 302 | memcpy(out, result, actual_len); |
| 303 | ret = actual_len; |
| 304 | } |
| 305 | |
| 306 | cleanup: |
| 307 | gcry_sexp_release(data_sexp); |
| 308 | gcry_sexp_release(cipher_sexp); |
| 309 | gcry_sexp_release(cipher_sexp_item); |
| 310 | gcry_mpi_release(cipher_mpi); |
| 311 | return ret; |
| 312 | } |
| 313 | |
| 314 | static int qcrypto_gcrypt_rsa_decrypt(QCryptoAkCipher *akcipher, |
| 315 | const void *in, size_t in_len, |
| 316 | void *out, size_t out_len, |
| 317 | Error **errp) |
| 318 | { |
| 319 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; |
| 320 | int ret = -1; |
| 321 | gcry_sexp_t data_sexp = NULL, cipher_sexp = NULL; |
| 322 | gcry_mpi_t data_mpi = NULL; |
| 323 | gcry_error_t err; |
| 324 | size_t actual_len; |
| 325 | const char *result; |
| 326 | |
| 327 | if (in_len > akcipher->max_ciphertext_len) { |
| 328 | error_setg(errp, "Ciphertext length is greater than key size: %d", |
| 329 | akcipher->max_ciphertext_len); |
| 330 | return ret; |
| 331 | } |
| 332 | |
| 333 | err = gcry_sexp_build(&cipher_sexp, NULL, |
| 334 | "(enc-val (flags %s) (rsa (a %b) ))", |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 335 | QCryptoRSAPaddingAlgo_str(rsa->padding_alg), |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 336 | in_len, in); |
| 337 | if (gcry_err_code(err) != 0) { |
| 338 | error_setg(errp, "Failed to build ciphertext: %s/%s", |
| 339 | gcry_strsource(err), gcry_strerror(err)); |
| 340 | goto cleanup; |
| 341 | } |
| 342 | |
| 343 | err = gcry_pk_decrypt(&data_sexp, cipher_sexp, rsa->key); |
| 344 | if (gcry_err_code(err) != 0) { |
| 345 | error_setg(errp, "Failed to decrypt: %s/%s", |
| 346 | gcry_strsource(err), gcry_strerror(err)); |
| 347 | goto cleanup; |
| 348 | } |
| 349 | |
| 350 | /* S-expression of plaintext: (value plaintext) */ |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 351 | if (rsa->padding_alg == QCRYPTO_RSA_PADDING_ALGO_RAW) { |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 352 | data_mpi = gcry_sexp_nth_mpi(data_sexp, 1, GCRYMPI_FMT_USG); |
| 353 | if (!data_mpi) { |
| 354 | error_setg(errp, "Invalid plaintext result"); |
| 355 | goto cleanup; |
| 356 | } |
| 357 | err = gcry_mpi_print(GCRYMPI_FMT_USG, out, out_len, |
| 358 | &actual_len, data_mpi); |
| 359 | if (gcry_err_code(err) != 0) { |
| 360 | error_setg(errp, "Failed to print MPI: %s/%s", |
| 361 | gcry_strsource(err), gcry_strerror(err)); |
| 362 | goto cleanup; |
| 363 | } |
| 364 | if (actual_len > out_len) { |
| 365 | error_setg(errp, "Plaintext buffer length is too small"); |
| 366 | goto cleanup; |
| 367 | } |
| 368 | /* We always padding leading-zeros for RSA-RAW */ |
| 369 | if (actual_len < out_len) { |
| 370 | memmove((uint8_t *)out + (out_len - actual_len), out, actual_len); |
| 371 | memset(out, 0, out_len - actual_len); |
| 372 | } |
| 373 | ret = out_len; |
| 374 | } else { |
| 375 | result = gcry_sexp_nth_data(data_sexp, 1, &actual_len); |
| 376 | if (!result) { |
| 377 | error_setg(errp, "Invalid plaintext result"); |
| 378 | goto cleanup; |
| 379 | } |
| 380 | if (actual_len > out_len) { |
| 381 | error_setg(errp, "Plaintext buffer length is too small"); |
| 382 | goto cleanup; |
| 383 | } |
| 384 | memcpy(out, result, actual_len); |
| 385 | ret = actual_len; |
| 386 | } |
| 387 | |
| 388 | cleanup: |
| 389 | gcry_sexp_release(cipher_sexp); |
| 390 | gcry_sexp_release(data_sexp); |
| 391 | gcry_mpi_release(data_mpi); |
| 392 | return ret; |
| 393 | } |
| 394 | |
| 395 | static int qcrypto_gcrypt_rsa_sign(QCryptoAkCipher *akcipher, |
| 396 | const void *in, size_t in_len, |
| 397 | void *out, size_t out_len, Error **errp) |
| 398 | { |
| 399 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; |
| 400 | int ret = -1; |
| 401 | gcry_sexp_t dgst_sexp = NULL, sig_sexp = NULL; |
| 402 | gcry_sexp_t sig_sexp_item = NULL; |
| 403 | const char *result; |
| 404 | gcry_error_t err; |
| 405 | size_t actual_len; |
| 406 | |
| 407 | if (in_len > akcipher->max_dgst_len) { |
| 408 | error_setg(errp, "Data length is greater than key size: %d", |
| 409 | akcipher->max_dgst_len); |
| 410 | return ret; |
| 411 | } |
| 412 | |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 413 | if (rsa->padding_alg != QCRYPTO_RSA_PADDING_ALGO_PKCS1) { |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 414 | error_setg(errp, "Invalid padding %u", rsa->padding_alg); |
| 415 | return ret; |
| 416 | } |
| 417 | |
| 418 | err = gcry_sexp_build(&dgst_sexp, NULL, |
| 419 | "(data (flags pkcs1) (hash %s %b))", |
Markus Armbruster | ef834aa | 2024-09-04 13:18:28 +0200 | [diff] [blame] | 420 | QCryptoHashAlgo_str(rsa->hash_alg), |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 421 | in_len, in); |
| 422 | if (gcry_err_code(err) != 0) { |
| 423 | error_setg(errp, "Failed to build dgst: %s/%s", |
| 424 | gcry_strsource(err), gcry_strerror(err)); |
| 425 | goto cleanup; |
| 426 | } |
| 427 | |
| 428 | err = gcry_pk_sign(&sig_sexp, dgst_sexp, rsa->key); |
| 429 | if (gcry_err_code(err) != 0) { |
| 430 | error_setg(errp, "Failed to make signature: %s/%s", |
| 431 | gcry_strsource(err), gcry_strerror(err)); |
| 432 | goto cleanup; |
| 433 | } |
| 434 | |
| 435 | /* S-expression of signature: (sig-val (rsa (s s-mpi))) */ |
| 436 | sig_sexp_item = gcry_sexp_find_token(sig_sexp, "s", 0); |
| 437 | if (!sig_sexp_item || gcry_sexp_length(sig_sexp_item) != 2) { |
| 438 | error_setg(errp, "Invalid signature result"); |
| 439 | goto cleanup; |
| 440 | } |
| 441 | |
| 442 | result = gcry_sexp_nth_data(sig_sexp_item, 1, &actual_len); |
| 443 | if (!result) { |
| 444 | error_setg(errp, "Invalid signature result"); |
| 445 | goto cleanup; |
| 446 | } |
| 447 | |
| 448 | if (actual_len > out_len) { |
| 449 | error_setg(errp, "Signature buffer length is too small"); |
| 450 | goto cleanup; |
| 451 | } |
| 452 | memcpy(out, result, actual_len); |
| 453 | ret = actual_len; |
| 454 | |
| 455 | cleanup: |
| 456 | gcry_sexp_release(dgst_sexp); |
| 457 | gcry_sexp_release(sig_sexp); |
| 458 | gcry_sexp_release(sig_sexp_item); |
| 459 | |
| 460 | return ret; |
| 461 | } |
| 462 | |
| 463 | static int qcrypto_gcrypt_rsa_verify(QCryptoAkCipher *akcipher, |
| 464 | const void *in, size_t in_len, |
| 465 | const void *in2, size_t in2_len, |
| 466 | Error **errp) |
| 467 | { |
| 468 | QCryptoGcryptRSA *rsa = (QCryptoGcryptRSA *)akcipher; |
| 469 | int ret = -1; |
| 470 | gcry_sexp_t sig_sexp = NULL, dgst_sexp = NULL; |
| 471 | gcry_error_t err; |
| 472 | |
| 473 | if (in_len > akcipher->max_signature_len) { |
| 474 | error_setg(errp, "Signature length is greater than key size: %d", |
| 475 | akcipher->max_signature_len); |
| 476 | return ret; |
| 477 | } |
| 478 | |
| 479 | if (in2_len > akcipher->max_dgst_len) { |
| 480 | error_setg(errp, "Data length is greater than key size: %d", |
| 481 | akcipher->max_dgst_len); |
| 482 | return ret; |
| 483 | } |
| 484 | |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 485 | if (rsa->padding_alg != QCRYPTO_RSA_PADDING_ALGO_PKCS1) { |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 486 | error_setg(errp, "Invalid padding %u", rsa->padding_alg); |
| 487 | return ret; |
| 488 | } |
| 489 | |
| 490 | err = gcry_sexp_build(&sig_sexp, NULL, |
| 491 | "(sig-val (rsa (s %b)))", in_len, in); |
| 492 | if (gcry_err_code(err) != 0) { |
| 493 | error_setg(errp, "Failed to build signature: %s/%s", |
| 494 | gcry_strsource(err), gcry_strerror(err)); |
| 495 | goto cleanup; |
| 496 | } |
| 497 | |
| 498 | err = gcry_sexp_build(&dgst_sexp, NULL, |
| 499 | "(data (flags pkcs1) (hash %s %b))", |
Markus Armbruster | ef834aa | 2024-09-04 13:18:28 +0200 | [diff] [blame] | 500 | QCryptoHashAlgo_str(rsa->hash_alg), |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 501 | in2_len, in2); |
| 502 | if (gcry_err_code(err) != 0) { |
| 503 | error_setg(errp, "Failed to build dgst: %s/%s", |
| 504 | gcry_strsource(err), gcry_strerror(err)); |
| 505 | goto cleanup; |
| 506 | } |
| 507 | |
| 508 | err = gcry_pk_verify(sig_sexp, dgst_sexp, rsa->key); |
| 509 | if (gcry_err_code(err) != 0) { |
| 510 | error_setg(errp, "Failed to verify signature: %s/%s", |
| 511 | gcry_strsource(err), gcry_strerror(err)); |
| 512 | goto cleanup; |
| 513 | } |
| 514 | ret = 0; |
| 515 | |
| 516 | cleanup: |
| 517 | gcry_sexp_release(dgst_sexp); |
| 518 | gcry_sexp_release(sig_sexp); |
| 519 | |
| 520 | return ret; |
| 521 | } |
| 522 | |
| 523 | QCryptoAkCipherDriver gcrypt_rsa = { |
| 524 | .encrypt = qcrypto_gcrypt_rsa_encrypt, |
| 525 | .decrypt = qcrypto_gcrypt_rsa_decrypt, |
| 526 | .sign = qcrypto_gcrypt_rsa_sign, |
| 527 | .verify = qcrypto_gcrypt_rsa_verify, |
| 528 | .free = qcrypto_gcrypt_rsa_free, |
| 529 | }; |
| 530 | |
| 531 | static QCryptoGcryptRSA *qcrypto_gcrypt_rsa_new( |
| 532 | const QCryptoAkCipherOptionsRSA *opt, |
| 533 | QCryptoAkCipherKeyType type, |
| 534 | const uint8_t *key, size_t keylen, |
| 535 | Error **errp) |
| 536 | { |
| 537 | QCryptoGcryptRSA *rsa = g_new0(QCryptoGcryptRSA, 1); |
| 538 | rsa->padding_alg = opt->padding_alg; |
| 539 | rsa->hash_alg = opt->hash_alg; |
| 540 | rsa->akcipher.driver = &gcrypt_rsa; |
| 541 | |
| 542 | switch (type) { |
Markus Armbruster | 5f4059e | 2024-09-04 13:18:27 +0200 | [diff] [blame] | 543 | case QCRYPTO_AK_CIPHER_KEY_TYPE_PRIVATE: |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 544 | if (qcrypto_gcrypt_parse_rsa_private_key(rsa, key, keylen, errp) != 0) { |
| 545 | goto error; |
| 546 | } |
| 547 | break; |
| 548 | |
Markus Armbruster | 5f4059e | 2024-09-04 13:18:27 +0200 | [diff] [blame] | 549 | case QCRYPTO_AK_CIPHER_KEY_TYPE_PUBLIC: |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 550 | if (qcrypto_gcrypt_parse_rsa_public_key(rsa, key, keylen, errp) != 0) { |
| 551 | goto error; |
| 552 | } |
| 553 | break; |
| 554 | |
| 555 | default: |
| 556 | error_setg(errp, "Unknown akcipher key type %d", type); |
| 557 | goto error; |
| 558 | } |
| 559 | |
| 560 | return rsa; |
| 561 | |
| 562 | error: |
| 563 | qcrypto_gcrypt_rsa_free((QCryptoAkCipher *)rsa); |
| 564 | return NULL; |
| 565 | } |
| 566 | |
| 567 | |
| 568 | bool qcrypto_akcipher_supports(QCryptoAkCipherOptions *opts) |
| 569 | { |
| 570 | switch (opts->alg) { |
Markus Armbruster | cd48d82 | 2024-09-04 13:18:31 +0200 | [diff] [blame] | 571 | case QCRYPTO_AK_CIPHER_ALGO_RSA: |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 572 | switch (opts->u.rsa.padding_alg) { |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 573 | case QCRYPTO_RSA_PADDING_ALGO_RAW: |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 574 | return true; |
| 575 | |
Markus Armbruster | c96050f | 2024-09-04 13:18:32 +0200 | [diff] [blame] | 576 | case QCRYPTO_RSA_PADDING_ALGO_PKCS1: |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 577 | switch (opts->u.rsa.hash_alg) { |
Markus Armbruster | ef834aa | 2024-09-04 13:18:28 +0200 | [diff] [blame] | 578 | case QCRYPTO_HASH_ALGO_MD5: |
| 579 | case QCRYPTO_HASH_ALGO_SHA1: |
| 580 | case QCRYPTO_HASH_ALGO_SHA256: |
| 581 | case QCRYPTO_HASH_ALGO_SHA512: |
Lei He | e09d1c2 | 2022-05-25 17:01:15 +0800 | [diff] [blame] | 582 | return true; |
| 583 | |
| 584 | default: |
| 585 | return false; |
| 586 | } |
| 587 | |
| 588 | default: |
| 589 | return false; |
| 590 | } |
| 591 | |
| 592 | default: |
| 593 | return true; |
| 594 | } |
| 595 | } |