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 86 /* declaration of the test functions */ 87 int x9_62_test_internal(BIO *out, int nid, const char *r, const char *s); 88 int test_builtin(BIO *); 89 90 /* some tests from the X9.62 draft */ 91 int x9_62_test_internal(BIO *out, int nid, const char *r_in, const char *s_in) 92 { 93 int ret = 0; 94 const char message[] = "abc"; 95 unsigned char digest[20]; 96 unsigned int dgst_len = 0; 97 EVP_MD_CTX md_ctx; 98 EC_KEY *key = NULL; 99 ECDSA_SIG *signature = NULL; 100 BIGNUM *r = NULL, *s = NULL; 101 102 EVP_MD_CTX_init(&md_ctx); 103 /* get the message digest */ 104 EVP_DigestInit(&md_ctx, EVP_ecdsa()); 105 EVP_DigestUpdate(&md_ctx, (const void*)message, 3); 106 EVP_DigestFinal(&md_ctx, digest, &dgst_len); 107 108 BIO_printf(out, "testing %s: ", OBJ_nid2sn(nid)); 109 /* create the key */ 110 if ((key = EC_KEY_new_by_curve_name(nid)) == NULL) 111 goto x962_int_err; 112 if (!EC_KEY_generate_key(key)) 113 goto x962_int_err; 114 BIO_printf(out, "."); 115 (void)BIO_flush(out); 116 /* create the signature */ 117 signature = ECDSA_do_sign(digest, 20, key); 118 if (signature == NULL) 119 goto x962_int_err; 120 BIO_printf(out, "."); 121 (void)BIO_flush(out); 122 /* compare the created signature with the expected signature */ 123 if ((r = BN_new()) == NULL || (s = BN_new()) == NULL) 124 goto x962_int_err; 125 if (!BN_dec2bn(&r, r_in) || 126 !BN_dec2bn(&s, s_in)) 127 goto x962_int_err; 128 if (BN_cmp(signature->r ,r) || BN_cmp(signature->s, s)) 129 goto x962_int_err; 130 BIO_printf(out, "."); 131 (void)BIO_flush(out); 132 /* verify the signature */ 133 if (ECDSA_do_verify(digest, 20, signature, key) != 1) 134 goto x962_int_err; 135 BIO_printf(out, "."); 136 (void)BIO_flush(out); 137 138 BIO_printf(out, " ok\n"); 139 ret = 1; 140 x962_int_err: 141 if (!ret) 142 BIO_printf(out, " failed\n"); 143 if (key) 144 EC_KEY_free(key); 145 if (signature) 146 ECDSA_SIG_free(signature); 147 if (r) 148 BN_free(r); 149 if (s) 150 BN_free(s); 151 EVP_MD_CTX_cleanup(&md_ctx); 152 return ret; 153 } 154 155 int test_builtin(BIO *out) 156 { 157 EC_builtin_curve *curves = NULL; 158 size_t crv_len = 0, n = 0; 159 EC_KEY *eckey = NULL, *wrong_eckey = NULL; 160 EC_GROUP *group; 161 ECDSA_SIG *ecdsa_sig = NULL; 162 unsigned char digest[20], wrong_digest[20]; 163 unsigned char *signature = NULL; 164 const unsigned char *sig_ptr; 165 unsigned char *sig_ptr2; 166 unsigned char *raw_buf = NULL; 167 unsigned int sig_len, degree, r_len, s_len, bn_len, buf_len; 168 int nid, ret = 0; 169 170 /* fill digest values with some random data */ 171 arc4random_buf(digest, 20); 172 arc4random_buf(wrong_digest, 20); 173 174 /* create and verify a ecdsa signature with every availble curve 175 * (with ) */ 176 BIO_printf(out, "\ntesting ECDSA_sign() and ECDSA_verify() " 177 "with some internal curves:\n"); 178 179 /* get a list of all internal curves */ 180 crv_len = EC_get_builtin_curves(NULL, 0); 181 182 curves = reallocarray(NULL, sizeof(EC_builtin_curve), crv_len); 183 184 if (curves == NULL) 185 { 186 BIO_printf(out, "malloc error\n"); 187 goto builtin_err; 188 } 189 190 if (!EC_get_builtin_curves(curves, crv_len)) 191 { 192 BIO_printf(out, "unable to get internal curves\n"); 193 goto builtin_err; 194 } 195 196 /* now create and verify a signature for every curve */ 197 for (n = 0; n < crv_len; n++) 198 { 199 unsigned char dirt, offset; 200 201 nid = curves[n].nid; 202 if (nid == NID_ipsec4) 203 continue; 204 /* create new ecdsa key (== EC_KEY) */ 205 if ((eckey = EC_KEY_new()) == NULL) 206 goto builtin_err; 207 group = EC_GROUP_new_by_curve_name(nid); 208 if (group == NULL) 209 goto builtin_err; 210 if (EC_KEY_set_group(eckey, group) == 0) 211 goto builtin_err; 212 EC_GROUP_free(group); 213 degree = EC_GROUP_get_degree(EC_KEY_get0_group(eckey)); 214 if (degree < 160) 215 /* drop the curve */ 216 { 217 EC_KEY_free(eckey); 218 eckey = NULL; 219 continue; 220 } 221 BIO_printf(out, "%s: ", OBJ_nid2sn(nid)); 222 /* create key */ 223 if (!EC_KEY_generate_key(eckey)) 224 { 225 BIO_printf(out, " failed\n"); 226 goto builtin_err; 227 } 228 /* create second key */ 229 if ((wrong_eckey = EC_KEY_new()) == NULL) 230 goto builtin_err; 231 group = EC_GROUP_new_by_curve_name(nid); 232 if (group == NULL) 233 goto builtin_err; 234 if (EC_KEY_set_group(wrong_eckey, group) == 0) 235 goto builtin_err; 236 EC_GROUP_free(group); 237 if (!EC_KEY_generate_key(wrong_eckey)) 238 { 239 BIO_printf(out, " failed\n"); 240 goto builtin_err; 241 } 242 243 BIO_printf(out, "."); 244 (void)BIO_flush(out); 245 /* check key */ 246 if (!EC_KEY_check_key(eckey)) 247 { 248 BIO_printf(out, " failed\n"); 249 goto builtin_err; 250 } 251 BIO_printf(out, "."); 252 (void)BIO_flush(out); 253 /* create signature */ 254 sig_len = ECDSA_size(eckey); 255 if ((signature = malloc(sig_len)) == NULL) 256 goto builtin_err; 257 if (!ECDSA_sign(0, digest, 20, signature, &sig_len, eckey)) 258 { 259 BIO_printf(out, " failed\n"); 260 goto builtin_err; 261 } 262 BIO_printf(out, "."); 263 (void)BIO_flush(out); 264 /* verify signature */ 265 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 266 { 267 BIO_printf(out, " failed\n"); 268 goto builtin_err; 269 } 270 BIO_printf(out, "."); 271 (void)BIO_flush(out); 272 /* verify signature with the wrong key */ 273 if (ECDSA_verify(0, digest, 20, signature, sig_len, 274 wrong_eckey) == 1) 275 { 276 BIO_printf(out, " failed\n"); 277 goto builtin_err; 278 } 279 BIO_printf(out, "."); 280 (void)BIO_flush(out); 281 /* wrong digest */ 282 if (ECDSA_verify(0, wrong_digest, 20, signature, sig_len, 283 eckey) == 1) 284 { 285 BIO_printf(out, " failed\n"); 286 goto builtin_err; 287 } 288 BIO_printf(out, "."); 289 (void)BIO_flush(out); 290 /* wrong length */ 291 if (ECDSA_verify(0, digest, 20, signature, sig_len - 1, 292 eckey) == 1) 293 { 294 BIO_printf(out, " failed\n"); 295 goto builtin_err; 296 } 297 BIO_printf(out, "."); 298 (void)BIO_flush(out); 299 300 /* Modify a single byte of the signature: to ensure we don't 301 * garble the ASN1 structure, we read the raw signature and 302 * modify a byte in one of the bignums directly. */ 303 sig_ptr = signature; 304 if ((ecdsa_sig = d2i_ECDSA_SIG(NULL, &sig_ptr, sig_len)) == NULL) 305 { 306 BIO_printf(out, " failed\n"); 307 goto builtin_err; 308 } 309 310 /* Store the two BIGNUMs in raw_buf. */ 311 r_len = BN_num_bytes(ecdsa_sig->r); 312 s_len = BN_num_bytes(ecdsa_sig->s); 313 bn_len = (degree + 7) / 8; 314 if ((r_len > bn_len) || (s_len > bn_len)) 315 { 316 BIO_printf(out, " failed\n"); 317 goto builtin_err; 318 } 319 buf_len = 2 * bn_len; 320 if ((raw_buf = calloc(1, buf_len)) == NULL) 321 goto builtin_err; 322 BN_bn2bin(ecdsa_sig->r, raw_buf + bn_len - r_len); 323 BN_bn2bin(ecdsa_sig->s, raw_buf + buf_len - s_len); 324 325 /* Modify a single byte in the buffer. */ 326 offset = raw_buf[10] % buf_len; 327 dirt = raw_buf[11] ? raw_buf[11] : 1; 328 raw_buf[offset] ^= dirt; 329 /* Now read the BIGNUMs back in from raw_buf. */ 330 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 331 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 332 goto builtin_err; 333 334 sig_ptr2 = signature; 335 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 336 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) == 1) 337 { 338 BIO_printf(out, " failed\n"); 339 goto builtin_err; 340 } 341 /* Sanity check: undo the modification and verify signature. */ 342 raw_buf[offset] ^= dirt; 343 if ((BN_bin2bn(raw_buf, bn_len, ecdsa_sig->r) == NULL) || 344 (BN_bin2bn(raw_buf + bn_len, bn_len, ecdsa_sig->s) == NULL)) 345 goto builtin_err; 346 347 sig_ptr2 = signature; 348 sig_len = i2d_ECDSA_SIG(ecdsa_sig, &sig_ptr2); 349 if (ECDSA_verify(0, digest, 20, signature, sig_len, eckey) != 1) 350 { 351 BIO_printf(out, " failed\n"); 352 goto builtin_err; 353 } 354 BIO_printf(out, "."); 355 (void)BIO_flush(out); 356 357 BIO_printf(out, " ok\n"); 358 /* cleanup */ 359 /* clean bogus errors */ 360 ERR_clear_error(); 361 free(signature); 362 signature = NULL; 363 EC_KEY_free(eckey); 364 eckey = NULL; 365 EC_KEY_free(wrong_eckey); 366 wrong_eckey = NULL; 367 ECDSA_SIG_free(ecdsa_sig); 368 ecdsa_sig = NULL; 369 free(raw_buf); 370 raw_buf = NULL; 371 } 372 373 ret = 1; 374 builtin_err: 375 if (eckey) 376 EC_KEY_free(eckey); 377 if (wrong_eckey) 378 EC_KEY_free(wrong_eckey); 379 if (ecdsa_sig) 380 ECDSA_SIG_free(ecdsa_sig); 381 free(signature); 382 free(raw_buf); 383 free(curves); 384 385 return ret; 386 } 387 388 int main(void) 389 { 390 int ret = 1; 391 BIO *out; 392 393 out = BIO_new_fp(stdout, BIO_NOCLOSE); 394 395 ERR_load_crypto_strings(); 396 397 /* the tests */ 398 if (!test_builtin(out)) goto err; 399 400 ret = 0; 401 err: 402 if (ret) 403 BIO_printf(out, "\nECDSA test failed\n"); 404 else 405 BIO_printf(out, "\nECDSA test passed\n"); 406 if (ret) 407 ERR_print_errors(out); 408 CRYPTO_cleanup_all_ex_data(); 409 ERR_remove_thread_state(NULL); 410 ERR_free_strings(); 411 CRYPTO_mem_leaks(out); 412 if (out != NULL) 413 BIO_free(out); 414 return ret; 415 } 416