test/sm2_internal_test.c

   1 /*
   2  * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include <openssl/bio.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/bn.h>
  17 #include <openssl/crypto.h>
  18 #include <openssl/err.h>
  19 #include <openssl/rand.h>
  20 #include "testutil.h"
  21
  22 #ifndef OPENSSL_NO_SM2
  23
  24 # include "internal/sm2.h"
  25
  26 static RAND_METHOD fake_rand;
  27 static const RAND_METHOD *saved_rand;
  28
  29 static uint8_t *fake_rand_bytes = NULL;
  30 static size_t fake_rand_bytes_offset = 0;
  31 static size_t fake_rand_size = 0;
  32
  33 static int get_faked_bytes(unsigned char *buf, int num)
  34 {
  35     int i;
  36
  37     if (fake_rand_bytes == NULL)
  38         return saved_rand->bytes(buf, num);
  39
  40     if (!TEST_size_t_le(fake_rand_bytes_offset + num, fake_rand_size))
  41         return 0;
  42
  43     for (i = 0; i != num; ++i)
  44         buf[i] = fake_rand_bytes[fake_rand_bytes_offset + i];
  45     fake_rand_bytes_offset += num;
  46     return 1;
  47 }
  48
  49 static int start_fake_rand(const char *hex_bytes)
  50 {
  51     /* save old rand method */
  52     if (!TEST_ptr(saved_rand = RAND_get_rand_method()))
  53         return 0;
  54
  55     fake_rand = *saved_rand;
  56     /* use own random function */
  57     fake_rand.bytes = get_faked_bytes;
  58
  59     fake_rand_bytes = OPENSSL_hexstr2buf(hex_bytes, NULL);
  60     fake_rand_bytes_offset = 0;
  61     fake_rand_size = strlen(hex_bytes) / 2;
  62
  63     /* set new RAND_METHOD */
  64     if (!TEST_true(RAND_set_rand_method(&fake_rand)))
  65         return 0;
  66     return 1;
  67 }
  68
  69 static int restore_rand(void)
  70 {
  71     OPENSSL_free(fake_rand_bytes);
  72     fake_rand_bytes = NULL;
  73     fake_rand_bytes_offset = 0;
  74     if (!TEST_true(RAND_set_rand_method(saved_rand)))
  75         return 0;
  76     return 1;
  77 }
  78
  79 static EC_GROUP *create_EC_group(const char *p_hex, const char *a_hex,
  80                                  const char *b_hex, const char *x_hex,
  81                                  const char *y_hex, const char *order_hex,
  82                                  const char *cof_hex)
  83 {
  84     BIGNUM *p = NULL;
  85     BIGNUM *a = NULL;
  86     BIGNUM *b = NULL;
  87     BIGNUM *g_x = NULL;
  88     BIGNUM *g_y = NULL;
  89     BIGNUM *order = NULL;
  90     BIGNUM *cof = NULL;
  91     EC_POINT *generator = NULL;
  92     EC_GROUP *group = NULL;
  93     int ok = 0;
  94
  95     if (!TEST_true(BN_hex2bn(&p, p_hex))
  96             || !TEST_true(BN_hex2bn(&a, a_hex))
  97             || !TEST_true(BN_hex2bn(&b, b_hex)))
  98         goto done;
  99
 100     group = EC_GROUP_new_curve_GFp(p, a, b, NULL);
 101     if (!TEST_ptr(group))
 102         goto done;
 103
 104     generator = EC_POINT_new(group);
 105     if (!TEST_ptr(generator))
 106         goto done;
 107
 108     if (!TEST_true(BN_hex2bn(&g_x, x_hex))
 109             || !TEST_true(BN_hex2bn(&g_y, y_hex))
 110             || !TEST_true(EC_POINT_set_affine_coordinates_GFp(group, generator,
 111                                                               g_x, g_y, NULL)))
 112         goto done;
 113
 114     if (!TEST_true(BN_hex2bn(&order, order_hex))
 115             || !TEST_true(BN_hex2bn(&cof, cof_hex))
 116             || !TEST_true(EC_GROUP_set_generator(group, generator, order, cof)))
 117         goto done;
 118
 119     ok = 1;
 120 done:
 121     BN_free(p);
 122     BN_free(a);
 123     BN_free(b);
 124     BN_free(g_x);
 125     BN_free(g_y);
 126     EC_POINT_free(generator);
 127     BN_free(order);
 128     BN_free(cof);
 129     if (!ok) {
 130         EC_GROUP_free(group);
 131         group = NULL;
 132     }
 133
 134     return group;
 135 }
 136
 137 static int test_sm2_crypt(const EC_GROUP *group,
 138                           const EVP_MD *digest,
 139                           const char *privkey_hex,
 140                           const char *message,
 141                           const char *k_hex, const char *ctext_hex)
 142 {
 143     const size_t msg_len = strlen(message);
 144     BIGNUM *priv = NULL;
 145     EC_KEY *key = NULL;
 146     EC_POINT *pt = NULL;
 147     unsigned char *expected = OPENSSL_hexstr2buf(ctext_hex, NULL);
 148     size_t ctext_len = 0;
 149     size_t ptext_len = 0;
 150     uint8_t *ctext = NULL;
 151     uint8_t *recovered = NULL;
 152     size_t recovered_len = msg_len;
 153     int rc = 0;
 154
 155     if (!TEST_ptr(expected)
 156             || !TEST_true(BN_hex2bn(&priv, privkey_hex)))
 157         goto done;
 158
 159     key = EC_KEY_new();
 160     if (!TEST_ptr(key)
 161             || !TEST_true(EC_KEY_set_group(key, group))
 162             || !TEST_true(EC_KEY_set_private_key(key, priv)))
 163         goto done;
 164
 165     pt = EC_POINT_new(group);
 166     if (!TEST_ptr(pt)
 167             || !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
 168             || !TEST_true(EC_KEY_set_public_key(key, pt))
 169             || !TEST_true(sm2_ciphertext_size(key, digest, msg_len, &ctext_len)))
 170         goto done;
 171
 172     ctext = OPENSSL_zalloc(ctext_len);
 173     if (!TEST_ptr(ctext))
 174         goto done;
 175
 176     start_fake_rand(k_hex);
 177     if (!TEST_true(sm2_encrypt(key, digest, (const uint8_t *)message, msg_len,
 178                                ctext, &ctext_len))
 179             || !TEST_size_t_eq(fake_rand_bytes_offset, fake_rand_size)) {
 180         restore_rand();
 181         goto done;
 182     }
 183     restore_rand();
 184
 185     if (!TEST_mem_eq(ctext, ctext_len, expected, ctext_len))
 186         goto done;
 187
 188     if (!TEST_true(sm2_plaintext_size(key, digest, ctext_len, &ptext_len))
 189             || !TEST_int_eq(ptext_len, msg_len))
 190         goto done;
 191
 192     recovered = OPENSSL_zalloc(ptext_len);
 193     if (!TEST_ptr(recovered)
 194             || !TEST_true(sm2_decrypt(key, digest, ctext, ctext_len, recovered, &recovered_len))
 195             || !TEST_int_eq(recovered_len, msg_len)
 196             || !TEST_mem_eq(recovered, recovered_len, message, msg_len))
 197         goto done;
 198
 199     rc = 1;
 200  done:
 201     BN_free(priv);
 202     EC_POINT_free(pt);
 203     OPENSSL_free(ctext);
 204     OPENSSL_free(recovered);
 205     OPENSSL_free(expected);
 206     EC_KEY_free(key);
 207     return rc;
 208 }
 209
 210 static int sm2_crypt_test(void)
 211 {
 212     int testresult = 0;
 213     EC_GROUP *test_group =
 214         create_EC_group
 215         ("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
 216          "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
 217          "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
 218          "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
 219          "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
 220          "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
 221          "1");
 222
 223     if (!TEST_ptr(test_group))
 224         goto done;
 225
 226     if (!test_sm2_crypt(
 227             test_group,
 228             EVP_sm3(),
 229             "1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
 230             "encryption standard",
 231             "004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
 232             "0092e8ff62146873c258557548500ab2df2a365e0609ab67640a1f6d57d7b17820"
 233             "008349312695a3e1d2f46905f39a766487f2432e95d6be0cb009fe8c69fd8825a7",
 234             "307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF1"
 235             "7F6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A2"
 236             "4B84400F01B804209C3D7360C30156FAB7C80A0276712DA9D8094A634B766D3A"
 237             "285E07480653426D0413650053A89B41C418B0C3AAD00D886C00286467"))
 238         goto done;
 239
 240     /* Same test as above except using SHA-256 instead of SM3 */
 241     if (!test_sm2_crypt(
 242             test_group,
 243             EVP_sha256(),
 244             "1649AB77A00637BD5E2EFE283FBF353534AA7F7CB89463F208DDBC2920BB0DA0",
 245             "encryption standard",
 246             "004C62EEFD6ECFC2B95B92FD6C3D9575148AFA17425546D49018E5388D49DD7B4F"
 247             "003da18008784352192d70f22c26c243174a447ba272fec64163dd4742bae8bc98"
 248             "00df17605cf304e9dd1dfeb90c015e93b393a6f046792f790a6fa4228af67d9588",
 249             "307B0220245C26FB68B1DDDDB12C4B6BF9F2B6D5FE60A383B0D18D1C4144ABF17F"
 250             "6252E7022076CB9264C2A7E88E52B19903FDC47378F605E36811F5C07423A24B84"
 251             "400F01B80420BE89139D07853100EFA763F60CBE30099EA3DF7F8F364F9D10A5E9"
 252             "88E3C5AAFC0413229E6C9AEE2BB92CAD649FE2C035689785DA33"))
 253         goto done;
 254
 255     testresult = 1;
 256  done:
 257     EC_GROUP_free(test_group);
 258
 259     return testresult;
 260 }
 261
 262 static int test_sm2_sign(const EC_GROUP *group,
 263                          const char *userid,
 264                          const char *privkey_hex,
 265                          const char *message,
 266                          const char *k_hex,
 267                          const char *r_hex,
 268                          const char *s_hex)
 269 {
 270     const size_t msg_len = strlen(message);
 271     int ok = 0;
 272     BIGNUM *priv = NULL;
 273     EC_POINT *pt = NULL;
 274     EC_KEY *key = NULL;
 275     ECDSA_SIG *sig = NULL;
 276     const BIGNUM *sig_r = NULL;
 277     const BIGNUM *sig_s = NULL;
 278     BIGNUM *r = NULL;
 279     BIGNUM *s = NULL;
 280
 281     if (!TEST_true(BN_hex2bn(&priv, privkey_hex)))
 282         goto done;
 283
 284     key = EC_KEY_new();
 285     if (!TEST_ptr(key)
 286             || !TEST_true(EC_KEY_set_group(key, group))
 287             || !TEST_true(EC_KEY_set_private_key(key, priv)))
 288         goto done;
 289
 290     pt = EC_POINT_new(group);
 291     if (!TEST_ptr(pt)
 292             || !TEST_true(EC_POINT_mul(group, pt, priv, NULL, NULL, NULL))
 293             || !TEST_true(EC_KEY_set_public_key(key, pt)))
 294         goto done;
 295
 296     start_fake_rand(k_hex);
 297     sig = sm2_do_sign(key, EVP_sm3(), userid, (const uint8_t *)message, msg_len);
 298     if (!TEST_ptr(sig)
 299             || !TEST_size_t_eq(fake_rand_bytes_offset, fake_rand_size)) {
 300         restore_rand();
 301         goto done;
 302     }
 303     restore_rand();
 304
 305     ECDSA_SIG_get0(sig, &sig_r, &sig_s);
 306
 307     if (!TEST_true(BN_hex2bn(&r, r_hex))
 308             || !TEST_true(BN_hex2bn(&s, s_hex))
 309             || !TEST_BN_eq(r, sig_r)
 310             || !TEST_BN_eq(s, sig_s))
 311         goto done;
 312
 313     ok = sm2_do_verify(key, EVP_sm3(), sig, userid, (const uint8_t *)message,
 314                        msg_len);
 315
 316     /* We goto done whether this passes or fails */
 317     TEST_true(ok);
 318
 319  done:
 320     ECDSA_SIG_free(sig);
 321     EC_POINT_free(pt);
 322     EC_KEY_free(key);
 323     BN_free(priv);
 324     BN_free(r);
 325     BN_free(s);
 326
 327     return ok;
 328 }
 329
 330 static int sm2_sig_test(void)
 331 {
 332     int testresult = 0;
 333     /* From draft-shen-sm2-ecdsa-02 */
 334     EC_GROUP *test_group =
 335         create_EC_group
 336         ("8542D69E4C044F18E8B92435BF6FF7DE457283915C45517D722EDB8B08F1DFC3",
 337          "787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498",
 338          "63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A",
 339          "421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D",
 340          "0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2",
 341          "8542D69E4C044F18E8B92435BF6FF7DD297720630485628D5AE74EE7C32E79B7",
 342          "1");
 343
 344     if (!TEST_ptr(test_group))
 345         goto done;
 346
 347     if (!TEST_true(test_sm2_sign(
 348                         test_group,
 349                         "ALICE123@YAHOO.COM",
 350                         "128B2FA8BD433C6C068C8D803DFF79792A519A55171B1B650C23661D15897263",
 351                         "message digest",
 352                         "006CB28D99385C175C94F94E934817663FC176D925DD72B727260DBAAE1FB2F96F"
 353                         "007c47811054c6f99613a578eb8453706ccb96384fe7df5c171671e760bfa8be3a",
 354                         "40F1EC59F793D9F49E09DCEF49130D4194F79FB1EED2CAA55BACDB49C4E755D1",
 355                         "6FC6DAC32C5D5CF10C77DFB20F7C2EB667A457872FB09EC56327A67EC7DEEBE7")))
 356         goto done;
 357
 358     testresult = 1;
 359
 360  done:
 361     EC_GROUP_free(test_group);
 362
 363     return testresult;
 364 }
 365
 366 #endif
 367
 368 int setup_tests(void)
 369 {
 370 #ifdef OPENSSL_NO_SM2
 371     TEST_note("SM2 is disabled.");
 372 #else
 373     ADD_TEST(sm2_crypt_test);
 374     ADD_TEST(sm2_sig_test);
 375 #endif
 376     return 1;
 377 }