test/sm2_internal_test.c

   1 /*
   2  * Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /*
  11  * Low level APIs are deprecated for public use, but still ok for internal use.
  12  */
  13 #include "internal/deprecated.h"
  14
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18
  19 #include <openssl/bio.h>
  20 #include <openssl/evp.h>
  21 #include <openssl/bn.h>
  22 #include <openssl/crypto.h>
  23 #include <openssl/err.h>
  24 #include <openssl/rand.h>
  25 #include "testutil.h"
  26
  27 #ifndef OPENSSL_NO_SM2
  28
  29 # include "crypto/sm2.h"
  30
  31 static fake_random_generate_cb get_faked_bytes;
  32
  33 static OSSL_PROVIDER *fake_rand = NULL;
  34 static uint8_t *fake_rand_bytes = NULL;
  35 static size_t fake_rand_bytes_offset = 0;
  36 static size_t fake_rand_size = 0;
  37
  38 static int get_faked_bytes(unsigned char *buf, size_t num,
  39                            ossl_unused const char *name,
  40                            ossl_unused EVP_RAND_CTX *ctx)
  41 {
  42     if (!TEST_ptr(fake_rand_bytes) || !TEST_size_t_gt(fake_rand_size, 0))
  43         return 0;
  44
  45     while (num-- > 0) {
  46         if (fake_rand_bytes_offset >= fake_rand_size)
  47             fake_rand_bytes_offset = 0;
  48         *buf++ = fake_rand_bytes[fake_rand_bytes_offset++];
  49     }
  50
  51     return 1;
  52 }
  53
  54 static int start_fake_rand(const char *hex_bytes)
  55 {
  56     OPENSSL_free(fake_rand_bytes);
  57     fake_rand_bytes_offset = 0;
  58     fake_rand_size = strlen(hex_bytes) / 2;
  59     if (!TEST_ptr(fake_rand_bytes = OPENSSL_hexstr2buf(hex_bytes, NULL)))
  60         return 0;
  61
  62     /* use own random function */
  63     fake_rand_set_public_private_callbacks(NULL, get_faked_bytes);
  64     return 1;
  65
  66 }
  67
  68 static void restore_rand(void)
  69 {
  70     fake_rand_set_public_private_callbacks(NULL, NULL);
  71     OPENSSL_free(fake_rand_bytes);
  72     fake_rand_bytes = NULL;
  73     fake_rand_bytes_offset = 0;
  74 }
  75
  76 static EC_GROUP *create_EC_group(const char *p_hex, const char *a_hex,
  77                                  const char *b_hex, const char *x_hex,
  78                                  const char *y_hex, const char *order_hex,
  79                                  const char *cof_hex)
  80 {
  81     BIGNUM *p = NULL;
  82     BIGNUM *a = NULL;
  83     BIGNUM *b = NULL;
  84     BIGNUM *g_x = NULL;
  85     BIGNUM *g_y = NULL;
  86     BIGNUM *order = NULL;
  87     BIGNUM *cof = NULL;
  88     EC_POINT *generator = NULL;
  89     EC_GROUP *group = NULL;
  90     int ok = 0;
  91
  92     if (!TEST_true(BN_hex2bn(&p, p_hex))
  93             || !TEST_true(BN_hex2bn(&a, a_hex))
  94             || !TEST_true(BN_hex2bn(&b, b_hex)))
  95         goto done;
  96
  97     group = EC_GROUP_new_curve_GFp(p, a, b, NULL);
  98     if (!TEST_ptr(group))
  99         goto done;
 100
 101     generator = EC_POINT_new(group);
 102     if (!TEST_ptr(generator))
 103         goto done;
 104
 105     if (!TEST_true(BN_hex2bn(&g_x, x_hex))
 106             || !TEST_true(BN_hex2bn(&g_y, y_hex))
 107             || !TEST_true(EC_POINT_set_affine_coordinates(group, generator, g_x,
 108                                                           g_y, NULL)))
 109         goto done;
 110
 111     if (!TEST_true(BN_hex2bn(&order, order_hex))
 112             || !TEST_true(BN_hex2bn(&cof, cof_hex))
 113             || !TEST_true(EC_GROUP_set_generator(group, generator, order, cof)))
 114         goto done;
 115
 116     ok = 1;
 117 done:
 118     BN_free(p);
 119     BN_free(a);
 120     BN_free(b);
 121     BN_free(g_x);
 122     BN_free(g_y);
 123     EC_POINT_free(generator);
 124     BN_free(order);
 125     BN_free(cof);
 126     if (!ok) {
 127         EC_GROUP_free(group);
 128         group = NULL;
 129     }
 130
 131     return group;
 132 }
 133
 134 static int test_sm2_crypt(const EC_GROUP *group,
 135                           const EVP_MD *digest,
 136                           const char *privkey_hex,
 137                           const char *message,
 138                           const char *k_hex, const char *ctext_hex)
 139 {
 140     const size_t msg_len = strlen(message);
 141     BIGNUM *priv = NULL;
 142     EC_KEY *key = NULL;
 143     EC_POINT *pt = NULL;
 144     unsigned char *expected = OPENSSL_hexstr2buf(ctext_hex, NULL);
 145     size_t ctext_len = 0;
 146     size_t ptext_len = 0;
 147     uint8_t *ctext = NULL;
 148     uint8_t *recovered = NULL;
 149     size_t recovered_len = msg_len;
 150     int rc = 0;
 151
 152     if (!TEST_ptr(expected)
 153             || !TEST_true(BN_hex2bn(&priv, privkey_hex)))
 154         goto done;
 155
 156     key = EC_KEY_new();
 157     if (!TEST_ptr(key)
 158             || !TEST_true(EC_KEY_set_group(key, group))
 159             || !TEST_true(EC_KEY_set_private_key(key, priv)))
 160         goto done;
 161
 162     pt = EC_POINT_new(group);
 163     if (!TEST_ptr(pt)
 164             || !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
 165             || !TEST_true(EC_KEY_set_public_key(key, pt))
 166             || !TEST_true(ossl_sm2_ciphertext_size(key, digest, msg_len,
 167                                                    &ctext_len)))
 168         goto done;
 169
 170     ctext = OPENSSL_zalloc(ctext_len);
 171     if (!TEST_ptr(ctext))
 172         goto done;
 173
 174     start_fake_rand(k_hex);
 175     if (!TEST_true(ossl_sm2_encrypt(key, digest,
 176                                     (const uint8_t *)message, msg_len,
 177                                     ctext, &ctext_len))) {
 178         restore_rand();
 179         goto done;
 180     }
 181     restore_rand();
 182
 183     if (!TEST_mem_eq(ctext, ctext_len, expected, ctext_len))
 184         goto done;
 185
 186     if (!TEST_true(ossl_sm2_plaintext_size(key, digest, ctext_len, &ptext_len))
 187             || !TEST_int_eq(ptext_len, msg_len))
 188         goto done;
 189
 190     recovered = OPENSSL_zalloc(ptext_len);
 191     if (!TEST_ptr(recovered)
 192             || !TEST_true(ossl_sm2_decrypt(key, digest, ctext, ctext_len,
 193                                            recovered, &recovered_len))
 194             || !TEST_int_eq(recovered_len, msg_len)
 195             || !TEST_mem_eq(recovered, recovered_len, message, msg_len))
 196         goto done;
 197
 198     rc = 1;
 199  done:
 200     BN_free(priv);
 201     EC_POINT_free(pt);
 202     OPENSSL_free(ctext);
 203     OPENSSL_free(recovered);
 204     OPENSSL_free(expected);
 205     EC_KEY_free(key);
 206     return rc;
 207 }
 208
 209 static int sm2_crypt_test(void)
 210 {
 211     int testresult = 0;
 212     EC_GROUP *test_group =
 213         create_EC_group
 214         ("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
 215          "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
 216          "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
 217          "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
 218          "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
 219          "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
 220          "1");
 221
 222     if (!TEST_ptr(test_group))
 223         goto done;
 224
 225     if (!test_sm2_crypt(
 226             test_group,
 227             EVP_sm3(),
 228             "1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
 229             "encryption standard",
 230             "004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
 231             "0092e8ff62146873c258557548500ab2df2a365e0609ab67640a1f6d57d7b17820"
 232             "008349312695a3e1d2f46905f39a766487f2432e95d6be0cb009fe8c69fd8825a7",
 233             "307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF1"
 234             "7F6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A2"
 235             "4B84400F01B804209C3D7360C30156FAB7C80A0276712DA9D8094A634B766D3A"
 236             "285E07480653426D0413650053A89B41C418B0C3AAD00D886C00286467"))
 237         goto done;
 238
 239     /* Same test as above except using SHA-256 instead of SM3 */
 240     if (!test_sm2_crypt(
 241             test_group,
 242             EVP_sha256(),
 243             "1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
 244             "encryption standard",
 245             "004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
 246             "003da18008784352192d70f22c26c243174a447ba272fec64163dd4742bae8bc98"
 247             "00df17605cf304e9dd1dfeb90c015e93b393a6f046792f790a6fa4228af67d9588",
 248             "307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF17F"
 249             "6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A24B84"
 250             "400F01B80420BE89139D07853100EFA763F60CBE30099EA3DF7F8F364F9D10A5E9"
 251             "88E3C5AAFC0413229E6C9AEE2BB92CAD649FE2C035689785DA33"))
 252         goto done;
 253
 254     testresult = 1;
 255  done:
 256     EC_GROUP_free(test_group);
 257
 258     return testresult;
 259 }
 260
 261 static int test_sm2_sign(const EC_GROUP *group,
 262                          const char *userid,
 263                          const char *privkey_hex,
 264                          const char *message,
 265                          const char *k_hex,
 266                          const char *r_hex,
 267                          const char *s_hex)
 268 {
 269     const size_t msg_len = strlen(message);
 270     int ok = 0;
 271     BIGNUM *priv = NULL;
 272     EC_POINT *pt = NULL;
 273     EC_KEY *key = NULL;
 274     ECDSA_SIG *sig = NULL;
 275     const BIGNUM *sig_r = NULL;
 276     const BIGNUM *sig_s = NULL;
 277     BIGNUM *r = NULL;
 278     BIGNUM *s = NULL;
 279
 280     if (!TEST_true(BN_hex2bn(&priv, privkey_hex)))
 281         goto done;
 282
 283     key = EC_KEY_new();
 284     if (!TEST_ptr(key)
 285             || !TEST_true(EC_KEY_set_group(key, group))
 286             || !TEST_true(EC_KEY_set_private_key(key, priv)))
 287         goto done;
 288
 289     pt = EC_POINT_new(group);
 290     if (!TEST_ptr(pt)
 291             || !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
 292             || !TEST_true(EC_KEY_set_public_key(key, pt)))
 293         goto done;
 294
 295     start_fake_rand(k_hex);
 296     sig = ossl_sm2_do_sign(key, EVP_sm3(), (const uint8_t *)userid,
 297                            strlen(userid), (const uint8_t *)message, msg_len);
 298     if (!TEST_ptr(sig)) {
 299         restore_rand();
 300         goto done;
 301     }
 302     restore_rand();
 303
 304     ECDSA_SIG_get0(sig, &sig_r, &sig_s);
 305
 306     if (!TEST_true(BN_hex2bn(&r, r_hex))
 307             || !TEST_true(BN_hex2bn(&s, s_hex))
 308             || !TEST_BN_eq(r, sig_r)
 309             || !TEST_BN_eq(s, sig_s))
 310         goto done;
 311
 312     ok = ossl_sm2_do_verify(key, EVP_sm3(), sig, (const uint8_t *)userid,
 313                             strlen(userid), (const uint8_t *)message, msg_len);
 314
 315     /* We goto done whether this passes or fails */
 316     TEST_true(ok);
 317
 318  done:
 319     ECDSA_SIG_free(sig);
 320     EC_POINT_free(pt);
 321     EC_KEY_free(key);
 322     BN_free(priv);
 323     BN_free(r);
 324     BN_free(s);
 325
 326     return ok;
 327 }
 328
 329 static int sm2_sig_test(void)
 330 {
 331     int testresult = 0;
 332     /* From draft-shen-sm2-ecdsa-02 */
 333     EC_GROUP *test_group =
 334         create_EC_group
 335         ("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
 336          "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
 337          "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
 338          "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
 339          "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
 340          "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
 341          "1");
 342
 343     if (!TEST_ptr(test_group))
 344         goto done;
 345
 346     if (!TEST_true(test_sm2_sign(
 347                         test_group,
 348                         "ALICE123@YAHOO.COM",
 349                         "128B2FA8BD433C6C068C8D803DFF79792A519A55171B1B650C23661D15897263",
 350                         "message digest",
 351                         "006CB28D99385C175C94F94E934817663FC176D925DD72B727260DBAAE1FB2F96F"
 352                         "007c47811054c6f99613a578eb8453706ccb96384fe7df5c171671e760bfa8be3a",
 353                         "40F1EC59F793D9F49E09DCEF49130D4194F79FB1EED2CAA55BACDB49C4E755D1",
 354                         "6FC6DAC32C5D5CF10C77DFB20F7C2EB667A457872FB09EC56327A67EC7DEEBE7")))
 355         goto done;
 356
 357     testresult = 1;
 358
 359  done:
 360     EC_GROUP_free(test_group);
 361
 362     return testresult;
 363 }
 364
 365 #endif
 366
 367 int setup_tests(void)
 368 {
 369 #ifdef OPENSSL_NO_SM2
 370     TEST_note("SM2 is disabled.");
 371 #else
 372     fake_rand = fake_rand_start(NULL);
 373     if (fake_rand == NULL)
 374         return 0;
 375
 376     ADD_TEST(sm2_crypt_test);
 377     ADD_TEST(sm2_sig_test);
 378 #endif
 379     return 1;
 380 }
 381
 382 void cleanup_tests(void)
 383 {
 384 #ifndef OPENSSL_NO_SM2
 385     fake_rand_finish(fake_rand);
 386 #endif
 387 }