test/sm2_internal_test.c

   1 /*
   2  * Copyright 2017-2020 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 RAND_METHOD fake_rand;
  32 static const RAND_METHOD *saved_rand;
  33
  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, int num)
  39 {
  40     if (fake_rand_bytes == NULL)
  41         return saved_rand->bytes(buf, num);
  42
  43     if (!TEST_size_t_gt(fake_rand_size, 0))
  44         return 0;
  45
  46     while (num-- > 0) {
  47         if (fake_rand_bytes_offset >= fake_rand_size)
  48             fake_rand_bytes_offset = 0;
  49         *buf++ = fake_rand_bytes[fake_rand_bytes_offset++];
  50     }
  51
  52     return 1;
  53 }
  54
  55 static int start_fake_rand(const char *hex_bytes)
  56 {
  57     /* save old rand method */
  58     if (!TEST_ptr(saved_rand = RAND_get_rand_method()))
  59         return 0;
  60
  61     fake_rand = *saved_rand;
  62     /* use own random function */
  63     fake_rand.bytes = get_faked_bytes;
  64
  65     fake_rand_bytes = OPENSSL_hexstr2buf(hex_bytes, NULL);
  66     fake_rand_bytes_offset = 0;
  67     fake_rand_size = strlen(hex_bytes) / 2;
  68
  69     /* set new RAND_METHOD */
  70     if (!TEST_true(RAND_set_rand_method(&fake_rand)))
  71         return 0;
  72     return 1;
  73 }
  74
  75 static int restore_rand(void)
  76 {
  77     OPENSSL_free(fake_rand_bytes);
  78     fake_rand_bytes = NULL;
  79     fake_rand_bytes_offset = 0;
  80     if (!TEST_true(RAND_set_rand_method(saved_rand)))
  81         return 0;
  82     return 1;
  83 }
  84
  85 static EC_GROUP *create_EC_group(const char *p_hex, const char *a_hex,
  86                                  const char *b_hex, const char *x_hex,
  87                                  const char *y_hex, const char *order_hex,
  88                                  const char *cof_hex)
  89 {
  90     BIGNUM *p = NULL;
  91     BIGNUM *a = NULL;
  92     BIGNUM *b = NULL;
  93     BIGNUM *g_x = NULL;
  94     BIGNUM *g_y = NULL;
  95     BIGNUM *order = NULL;
  96     BIGNUM *cof = NULL;
  97     EC_POINT *generator = NULL;
  98     EC_GROUP *group = NULL;
  99     int ok = 0;
 100
 101     if (!TEST_true(BN_hex2bn(&p, p_hex))
 102             || !TEST_true(BN_hex2bn(&a, a_hex))
 103             || !TEST_true(BN_hex2bn(&b, b_hex)))
 104         goto done;
 105
 106     group = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 107     if (!TEST_ptr(group))
 108         goto done;
 109
 110     generator = EC_POINT_new(group);
 111     if (!TEST_ptr(generator))
 112         goto done;
 113
 114     if (!TEST_true(BN_hex2bn(&g_x, x_hex))
 115             || !TEST_true(BN_hex2bn(&g_y, y_hex))
 116             || !TEST_true(EC_POINT_set_affine_coordinates(group, generator, g_x,
 117                                                           g_y, NULL)))
 118         goto done;
 119
 120     if (!TEST_true(BN_hex2bn(&order, order_hex))
 121             || !TEST_true(BN_hex2bn(&cof, cof_hex))
 122             || !TEST_true(EC_GROUP_set_generator(group, generator, order, cof)))
 123         goto done;
 124
 125     ok = 1;
 126 done:
 127     BN_free(p);
 128     BN_free(a);
 129     BN_free(b);
 130     BN_free(g_x);
 131     BN_free(g_y);
 132     EC_POINT_free(generator);
 133     BN_free(order);
 134     BN_free(cof);
 135     if (!ok) {
 136         EC_GROUP_free(group);
 137         group = NULL;
 138     }
 139
 140     return group;
 141 }
 142
 143 static int test_sm2_crypt(const EC_GROUP *group,
 144                           const EVP_MD *digest,
 145                           const char *privkey_hex,
 146                           const char *message,
 147                           const char *k_hex, const char *ctext_hex)
 148 {
 149     const size_t msg_len = strlen(message);
 150     BIGNUM *priv = NULL;
 151     EC_KEY *key = NULL;
 152     EC_POINT *pt = NULL;
 153     unsigned char *expected = OPENSSL_hexstr2buf(ctext_hex, NULL);
 154     size_t ctext_len = 0;
 155     size_t ptext_len = 0;
 156     uint8_t *ctext = NULL;
 157     uint8_t *recovered = NULL;
 158     size_t recovered_len = msg_len;
 159     int rc = 0;
 160
 161     if (!TEST_ptr(expected)
 162             || !TEST_true(BN_hex2bn(&priv, privkey_hex)))
 163         goto done;
 164
 165     key = EC_KEY_new();
 166     if (!TEST_ptr(key)
 167             || !TEST_true(EC_KEY_set_group(key, group))
 168             || !TEST_true(EC_KEY_set_private_key(key, priv)))
 169         goto done;
 170
 171     pt = EC_POINT_new(group);
 172     if (!TEST_ptr(pt)
 173             || !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
 174             || !TEST_true(EC_KEY_set_public_key(key, pt))
 175             || !TEST_true(sm2_ciphertext_size(key, digest, msg_len, &ctext_len)))
 176         goto done;
 177
 178     ctext = OPENSSL_zalloc(ctext_len);
 179     if (!TEST_ptr(ctext))
 180         goto done;
 181
 182     start_fake_rand(k_hex);
 183     if (!TEST_true(sm2_encrypt(key, digest, (const uint8_t *)message, msg_len,
 184                                ctext, &ctext_len))) {
 185         restore_rand();
 186         goto done;
 187     }
 188     restore_rand();
 189
 190     if (!TEST_mem_eq(ctext, ctext_len, expected, ctext_len))
 191         goto done;
 192
 193     if (!TEST_true(sm2_plaintext_size(key, digest, ctext_len, &ptext_len))
 194             || !TEST_int_eq(ptext_len, msg_len))
 195         goto done;
 196
 197     recovered = OPENSSL_zalloc(ptext_len);
 198     if (!TEST_ptr(recovered)
 199             || !TEST_true(sm2_decrypt(key, digest, ctext, ctext_len, recovered, &recovered_len))
 200             || !TEST_int_eq(recovered_len, msg_len)
 201             || !TEST_mem_eq(recovered, recovered_len, message, msg_len))
 202         goto done;
 203
 204     rc = 1;
 205  done:
 206     BN_free(priv);
 207     EC_POINT_free(pt);
 208     OPENSSL_free(ctext);
 209     OPENSSL_free(recovered);
 210     OPENSSL_free(expected);
 211     EC_KEY_free(key);
 212     return rc;
 213 }
 214
 215 static int sm2_crypt_test(void)
 216 {
 217     int testresult = 0;
 218     EC_GROUP *test_group =
 219         create_EC_group
 220         ("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
 221          "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
 222          "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
 223          "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
 224          "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
 225          "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
 226          "1");
 227
 228     if (!TEST_ptr(test_group))
 229         goto done;
 230
 231     if (!test_sm2_crypt(
 232             test_group,
 233             EVP_sm3(),
 234             "1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
 235             "encryption standard",
 236             "004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
 237             "0092e8ff62146873c258557548500ab2df2a365e0609ab67640a1f6d57d7b17820"
 238             "008349312695a3e1d2f46905f39a766487f2432e95d6be0cb009fe8c69fd8825a7",
 239             "307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF1"
 240             "7F6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A2"
 241             "4B84400F01B804209C3D7360C30156FAB7C80A0276712DA9D8094A634B766D3A"
 242             "285E07480653426D0413650053A89B41C418B0C3AAD00D886C00286467"))
 243         goto done;
 244
 245     /* Same test as above except using SHA-256 instead of SM3 */
 246     if (!test_sm2_crypt(
 247             test_group,
 248             EVP_sha256(),
 249             "1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
 250             "encryption standard",
 251             "004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
 252             "003da18008784352192d70f22c26c243174a447ba272fec64163dd4742bae8bc98"
 253             "00df17605cf304e9dd1dfeb90c015e93b393a6f046792f790a6fa4228af67d9588",
 254             "307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF17F"
 255             "6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A24B84"
 256             "400F01B80420BE89139D07853100EFA763F60CBE30099EA3DF7F8F364F9D10A5E9"
 257             "88E3C5AAFC0413229E6C9AEE2BB92CAD649FE2C035689785DA33"))
 258         goto done;
 259
 260     testresult = 1;
 261  done:
 262     EC_GROUP_free(test_group);
 263
 264     return testresult;
 265 }
 266
 267 static int test_sm2_sign(const EC_GROUP *group,
 268                          const char *userid,
 269                          const char *privkey_hex,
 270                          const char *message,
 271                          const char *k_hex,
 272                          const char *r_hex,
 273                          const char *s_hex)
 274 {
 275     const size_t msg_len = strlen(message);
 276     int ok = 0;
 277     BIGNUM *priv = NULL;
 278     EC_POINT *pt = NULL;
 279     EC_KEY *key = NULL;
 280     ECDSA_SIG *sig = NULL;
 281     const BIGNUM *sig_r = NULL;
 282     const BIGNUM *sig_s = NULL;
 283     BIGNUM *r = NULL;
 284     BIGNUM *s = NULL;
 285
 286     if (!TEST_true(BN_hex2bn(&priv, privkey_hex)))
 287         goto done;
 288
 289     key = EC_KEY_new();
 290     if (!TEST_ptr(key)
 291             || !TEST_true(EC_KEY_set_group(key, group))
 292             || !TEST_true(EC_KEY_set_private_key(key, priv)))
 293         goto done;
 294
 295     pt = EC_POINT_new(group);
 296     if (!TEST_ptr(pt)
 297             || !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
 298             || !TEST_true(EC_KEY_set_public_key(key, pt)))
 299         goto done;
 300
 301     start_fake_rand(k_hex);
 302     sig = sm2_do_sign(key, EVP_sm3(), (const uint8_t *)userid, strlen(userid),
 303                       (const uint8_t *)message, msg_len);
 304     if (!TEST_ptr(sig)) {
 305         restore_rand();
 306         goto done;
 307     }
 308     restore_rand();
 309
 310     ECDSA_SIG_get0(sig, &sig_r, &sig_s);
 311
 312     if (!TEST_true(BN_hex2bn(&r, r_hex))
 313             || !TEST_true(BN_hex2bn(&s, s_hex))
 314             || !TEST_BN_eq(r, sig_r)
 315             || !TEST_BN_eq(s, sig_s))
 316         goto done;
 317
 318     ok = sm2_do_verify(key, EVP_sm3(), sig, (const uint8_t *)userid,
 319                        strlen(userid), (const uint8_t *)message, msg_len);
 320
 321     /* We goto done whether this passes or fails */
 322     TEST_true(ok);
 323
 324  done:
 325     ECDSA_SIG_free(sig);
 326     EC_POINT_free(pt);
 327     EC_KEY_free(key);
 328     BN_free(priv);
 329     BN_free(r);
 330     BN_free(s);
 331
 332     return ok;
 333 }
 334
 335 static int sm2_sig_test(void)
 336 {
 337     int testresult = 0;
 338     /* From draft-shen-sm2-ecdsa-02 */
 339     EC_GROUP *test_group =
 340         create_EC_group
 341         ("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
 342          "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
 343          "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
 344          "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
 345          "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
 346          "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
 347          "1");
 348
 349     if (!TEST_ptr(test_group))
 350         goto done;
 351
 352     if (!TEST_true(test_sm2_sign(
 353                         test_group,
 354                         "ALICE123@YAHOO.COM",
 355                         "128B2FA8BD433C6C068C8D803DFF79792A519A55171B1B650C23661D15897263",
 356                         "message digest",
 357                         "006CB28D99385C175C94F94E934817663FC176D925DD72B727260DBAAE1FB2F96F"
 358                         "007c47811054c6f99613a578eb8453706ccb96384fe7df5c171671e760bfa8be3a",
 359                         "40F1EC59F793D9F49E09DCEF49130D4194F79FB1EED2CAA55BACDB49C4E755D1",
 360                         "6FC6DAC32C5D5CF10C77DFB20F7C2EB667A457872FB09EC56327A67EC7DEEBE7")))
 361         goto done;
 362
 363     testresult = 1;
 364
 365  done:
 366     EC_GROUP_free(test_group);
 367
 368     return testresult;
 369 }
 370
 371 #endif
 372
 373 int setup_tests(void)
 374 {
 375 #ifdef OPENSSL_NO_SM2
 376     TEST_note("SM2 is disabled.");
 377 #else
 378     ADD_TEST(sm2_crypt_test);
 379     ADD_TEST(sm2_sig_test);
 380 #endif
 381     return 1;
 382 }