1 /* crypto/ecdsa/ecdsatest.c */ 2 /* 3 * Written by Nils Larsch for the OpenSSL project. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 /* ==================================================================== 59 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 60 * 61 * Portions of the attached software ("Contribution") are developed by 62 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 63 * 64 * The Contribution is licensed pursuant to the OpenSSL open source 65 * license provided above. 66 * 67 * The elliptic curve binary polynomial software is originally written by 68 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems Laboratories. 69 * 70 */ 71 72 #include <stdio.h> 73 #include <stdlib.h> 74 #include <string.h> 75 76 #include <openssl/crypto.h> 77 #include <openssl/bio.h> 78 #include <openssl/evp.h> 79 #include <openssl/bn.h> 80 #include <openssl/ecdsa.h> 81 #ifndef OPENSSL_NO_ENGINE 82 #include <openssl/engine.h> 83 #endif 84 #include <openssl/err.h> 85 #include <openssl/rand.h> 86 87 /* declaration of the test functions */ 88 int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s); 89 int test_builtin(BIO *); 90 91 /* some tests from the X9.62 draft */ 92 int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in) 93 { 94 int ret = 0; 95 const char message[] = "abc"; 96 unsigned char digest[20]; 97 unsigned int dgst_len = 0; 98 EVP_MD_CTX md_ctx; 99 EC_KEY *key = NULL; 100 ECDSA_SIG *signature = NULL; 101 BIGNUM *r = NULL, *s = NULL; 102 103 EVP_MD_CTX_init(&md_ctx); 104 /* get the message digest */ 105 EVP_DigestInit(&md_ctx, EVP_ecdsa()); 106 EVP_DigestUpdate(&md_ctx, (const void*)message, 3); 107 EVP_DigestFinal(&md_ctx, digest, &dgst_len); 108 109 BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid)); 110 /* create the key */ 111 if ((key = EC_KEY_new_by_curve_name(nid)) == NULL) 112 goto x962_int_err; 113 if (!EC_KEY_generate_key(key)) 114 goto x962_int_err; 115 BIO_printf(out, "."); 116 (void)BIO_flush(out); 117 /* create the signature */ 118 signature = ECDSA_do_sign(digest, 20, key); 119 if (signature == NULL) 120 goto x962_int_err; 121 BIO_printf(out, "."); 122 (void)BIO_flush(out); 123 /* compare the created signature with the expected signature */ 124 if ((r = BN_new()) == NULL || (s = BN_new()) == NULL) 125 goto x962_int_err; 126 if (!BN_dec2bn(&r, r_in) || 127 !BN_dec2bn(&s, s_in)) 128 goto x962_int_err; 129 if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s)) 130 goto x962_int_err; 131 BIO_printf(out, "."); 132 (void)BIO_flush(out); 133 /* verify the signature */ 134 if (ECDSA_do_verify(digest, 20, signature, key) != 1) 135 goto x962_int_err; 136 BIO_printf(out, "."); 137 (void)BIO_flush(out); 138 139 BIO_printf(out, " ok\n"); 140 ret = 1; 141 x962_int_err: 142 if (!ret) 143 BIO_printf(out, " failed\n"); 144 if (key) 145 EC_KEY_free(key); 146 if (signature) 147 ECDSA_SIG_free(signature); 148 if (r) 149 BN_free(r); 150 if (s) 151 BN_free(s); 152 EVP_MD_CTX_cleanup(&md_ctx); 153 return ret; 154 } 155 156 int test_builtin(BIO *out) 157 { 158 EC_builtin_curve *curves = NULL; 159 size_t crv_len = 0, n = 0; 160 EC_KEY *eckey = NULL, *wrong_eckey = NULL; 161 EC_GROUP *group; 162 ECDSA_SIG *ecdsa_sig = NULL; 163 unsigned char digest[20], wrong_digest[20]; 164 unsigned char *signature = NULL; 165 const unsigned char *sig_ptr; 166 unsigned char *sig_ptr2; 167 unsigned char *raw_buf = NULL; 168 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; 169 int nid, ret = 0; 170 171 /* fill digest values with some random data */ 172 if (!RAND_pseudo_bytes(digest, 20) || 173 !RAND_pseudo_bytes(wrong_digest, 20)) 174 { 175 BIO_printf(out, "ERROR: unable to get random data\n"); 176 goto builtin_err; 177 } 178 179 /* create and verify a ecdsa signature with every availble curve 180 * (with ) */ 181 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() " 182 "with some internal curves:\n"); 183 184 /* get a list of all internal curves */ 185 crv_len = EC_get_builtin_curves(NULL, 0); 186 187 curves = reallocarray(NULL, sizeof(EC_builtin_curve), crv_len); 188 189 if (curves == NULL) 190 { 191 BIO_printf(out, "malloc error\n"); 192 goto builtin_err; 193 } 194 195 if (!EC_get_builtin_curves(curves, crv_len)) 196 { 197 BIO_printf(out, "unable to get internal curves\n"); 198 goto builtin_err; 199 } 200 201 /* now create and verify a signature for every curve */ 202 for (n = 0; n < crv_len; n++) 203 { 204 unsigned char dirt, offset; 205 206 nid = curves[n].nid; 207 if (nid == NID_ipsec4) 208 continue; 209 /* create new ecdsa key (== EC_KEY) */ 210 if ((eckey = EC_KEY_new()) == NULL) 211 goto builtin_err; 212 group = EC_GROUP_new_by_curve_name(nid); 213 if (group == NULL) 214 goto builtin_err; 215 if (EC_KEY_set_group(eckey, group) == 0) 216 goto builtin_err; 217 EC_GROUP_free(group); 218 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 219 if (degree < 160) 220 /* drop the curve */ 221 { 222 EC_KEY_free(eckey); 223 eckey = NULL; 224 continue; 225 } 226 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 227 /* create key */ 228 if (!EC_KEY_generate_key(eckey)) 229 { 230 BIO_printf(out, " failed\n"); 231 goto builtin_err; 232 } 233 /* create second key */ 234 if ((wrong_eckey = EC_KEY_new()) == NULL) 235 goto builtin_err; 236 group = EC_GROUP_new_by_curve_name(nid); 237 if (group == NULL) 238 goto builtin_err; 239 if (EC_KEY_set_group(wrong_eckey, group) == 0) 240 goto builtin_err; 241 EC_GROUP_free(group); 242 if (!EC_KEY_generate_key(wrong_eckey)) 243 { 244 BIO_printf(out, " failed\n"); 245 goto builtin_err; 246 } 247 248 BIO_printf(out, "."); 249 (void)BIO_flush(out); 250 /* check key */ 251 if (!EC_KEY_check_key(eckey)) 252 { 253 BIO_printf(out, " failed\n"); 254 goto builtin_err; 255 } 256 BIO_printf(out, "."); 257 (void)BIO_flush(out); 258 /* create signature */ 259 sig_len = ECDSA_size(eckey); 260 if ((signature = malloc(sig_len)) == NULL) 261 goto builtin_err; 262 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) 263 { 264 BIO_printf(out, " failed\n"); 265 goto builtin_err; 266 } 267 BIO_printf(out, "."); 268 (void)BIO_flush(out); 269 /* verify signature */ 270 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 271 { 272 BIO_printf(out, " failed\n"); 273 goto builtin_err; 274 } 275 BIO_printf(out, "."); 276 (void)BIO_flush(out); 277 /* verify signature with the wrong key */ 278 if (ECDSA_verify(0, digest, 20, signature, sig_len, 279 wrong_eckey) == 1) 280 { 281 BIO_printf(out, " failed\n"); 282 goto builtin_err; 283 } 284 BIO_printf(out, "."); 285 (void)BIO_flush(out); 286 /* wrong digest */ 287 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, 288 eckey) == 1) 289 { 290 BIO_printf(out, " failed\n"); 291 goto builtin_err; 292 } 293 BIO_printf(out, "."); 294 (void)BIO_flush(out); 295 /* wrong length */ 296 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, 297 eckey) == 1) 298 { 299 BIO_printf(out, " failed\n"); 300 goto builtin_err; 301 } 302 BIO_printf(out, "."); 303 (void)BIO_flush(out); 304 305 /* Modify a single byte of the signature: to ensure we don't 306 * garble the ASN1 structure, we read the raw signature and 307 * modify a byte in one of the bignums directly. */ 308 sig_ptr = signature; 309 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) 310 { 311 BIO_printf(out, " failed\n"); 312 goto builtin_err; 313 } 314 315 /* Store the two BIGNUMs in raw_buf. */ 316 r_len = BN_num_bytes(ecdsa_sig->r); 317 s_len = BN_num_bytes(ecdsa_sig->s); 318 bn_len = (degree + 7) / 8; 319 if ((r_len > bn_len) || (s_len > bn_len)) 320 { 321 BIO_printf(out, " failed\n"); 322 goto builtin_err; 323 } 324 buf_len = 2 * bn_len; 325 if ((raw_buf = calloc(1, buf_len)) == NULL) 326 goto builtin_err; 327 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); 328 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); 329 330 /* Modify a single byte in the buffer. */ 331 offset = raw_buf[10] % buf_len; 332 dirt = raw_buf[11] ? raw_buf[11] : 1; 333 raw_buf[offset] ^= dirt; 334 /* Now read the BIGNUMs back in from raw_buf. */ 335 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 336 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 337 goto builtin_err; 338 339 sig_ptr2 = signature; 340 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 341 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) 342 { 343 BIO_printf(out, " failed\n"); 344 goto builtin_err; 345 } 346 /* Sanity check: undo the modification and verify signature. */ 347 raw_buf[offset] ^= dirt; 348 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 349 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 350 goto builtin_err; 351 352 sig_ptr2 = signature; 353 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 354 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 355 { 356 BIO_printf(out, " failed\n"); 357 goto builtin_err; 358 } 359 BIO_printf(out, "."); 360 (void)BIO_flush(out); 361 362 BIO_printf(out, " ok\n"); 363 /* cleanup */ 364 /* clean bogus errors */ 365 ERR_clear_error(); 366 free(signature); 367 signature = NULL; 368 EC_KEY_free(eckey); 369 eckey = NULL; 370 EC_KEY_free(wrong_eckey); 371 wrong_eckey = NULL; 372 ECDSA_SIG_free(ecdsa_sig); 373 ecdsa_sig = NULL; 374 free(raw_buf); 375 raw_buf = NULL; 376 } 377 378 ret = 1; 379 builtin_err: 380 if (eckey) 381 EC_KEY_free(eckey); 382 if (wrong_eckey) 383 EC_KEY_free(wrong_eckey); 384 if (ecdsa_sig) 385 ECDSA_SIG_free(ecdsa_sig); 386 free(signature); 387 free(raw_buf); 388 free(curves); 389 390 return ret; 391 } 392 393 int main(void) 394 { 395 int ret = 1; 396 BIO *out; 397 398 out = BIO_new_fp(stdout, BIO_NOCLOSE); 399 400 ERR_load_crypto_strings(); 401 402 /* the tests */ 403 if (!test_builtin(out)) goto err; 404 405 ret = 0; 406 err: 407 if (ret) 408 BIO_printf(out, "\nECDSA test failed\n"); 409 else 410 BIO_printf(out, "\nECDSA test passed\n"); 411 if (ret) 412 ERR_print_errors(out); 413 CRYPTO_cleanup_all_ex_data(); 414 ERR_remove_thread_state(NULL); 415 ERR_free_strings(); 416 CRYPTO_mem_leaks(out); 417 if (out != NULL) 418 BIO_free(out); 419 return ret; 420 } 421