1 /* $OpenBSD: dh_ameth.c,v 1.18 2020/01/04 13:57:43 inoguchi Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 2006. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2006 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 #include <stdio.h> 60 61 #include <openssl/asn1.h> 62 #include <openssl/bn.h> 63 #include <openssl/dh.h> 64 #include <openssl/err.h> 65 #include <openssl/x509.h> 66 67 #include "asn1_locl.h" 68 69 static void 70 int_dh_free(EVP_PKEY *pkey) 71 { 72 DH_free(pkey->pkey.dh); 73 } 74 75 static int 76 dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) 77 { 78 const unsigned char *p, *pm; 79 int pklen, pmlen; 80 int ptype; 81 const void *pval; 82 const ASN1_STRING *pstr; 83 X509_ALGOR *palg; 84 ASN1_INTEGER *public_key = NULL; 85 DH *dh = NULL; 86 87 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) 88 return 0; 89 X509_ALGOR_get0(NULL, &ptype, &pval, palg); 90 91 if (ptype != V_ASN1_SEQUENCE) { 92 DHerror(DH_R_PARAMETER_ENCODING_ERROR); 93 goto err; 94 } 95 96 pstr = pval; 97 pm = pstr->data; 98 pmlen = pstr->length; 99 100 if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) { 101 DHerror(DH_R_DECODE_ERROR); 102 goto err; 103 } 104 105 if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) { 106 DHerror(DH_R_DECODE_ERROR); 107 goto err; 108 } 109 110 /* We have parameters now set public key */ 111 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) { 112 DHerror(DH_R_BN_DECODE_ERROR); 113 goto err; 114 } 115 116 ASN1_INTEGER_free(public_key); 117 EVP_PKEY_assign_DH(pkey, dh); 118 return 1; 119 120 err: 121 if (public_key) 122 ASN1_INTEGER_free(public_key); 123 DH_free(dh); 124 return 0; 125 } 126 127 static int 128 dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) 129 { 130 DH *dh; 131 int ptype; 132 unsigned char *penc = NULL; 133 int penclen; 134 ASN1_STRING *str; 135 ASN1_INTEGER *pub_key = NULL; 136 137 dh=pkey->pkey.dh; 138 139 str = ASN1_STRING_new(); 140 if (str == NULL) { 141 DHerror(ERR_R_MALLOC_FAILURE); 142 goto err; 143 } 144 145 str->length = i2d_DHparams(dh, &str->data); 146 if (str->length <= 0) { 147 DHerror(ERR_R_MALLOC_FAILURE); 148 goto err; 149 } 150 ptype = V_ASN1_SEQUENCE; 151 152 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL); 153 if (!pub_key) 154 goto err; 155 156 penclen = i2d_ASN1_INTEGER(pub_key, &penc); 157 158 ASN1_INTEGER_free(pub_key); 159 160 if (penclen <= 0) { 161 DHerror(ERR_R_MALLOC_FAILURE); 162 goto err; 163 } 164 165 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH), ptype, 166 (void *)str, penc, penclen)) 167 return 1; 168 169 err: 170 free(penc); 171 ASN1_STRING_free(str); 172 173 return 0; 174 } 175 176 /* 177 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in 178 * that the AlgorithmIdentifier contains the paramaters, the private key 179 * is explcitly included and the pubkey must be recalculated. 180 */ 181 182 static int 183 dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8) 184 { 185 const unsigned char *p, *pm; 186 int pklen, pmlen; 187 int ptype; 188 const void *pval; 189 const ASN1_STRING *pstr; 190 const X509_ALGOR *palg; 191 ASN1_INTEGER *privkey = NULL; 192 DH *dh = NULL; 193 194 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) 195 return 0; 196 197 X509_ALGOR_get0(NULL, &ptype, &pval, palg); 198 199 if (ptype != V_ASN1_SEQUENCE) 200 goto decerr; 201 202 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen))) 203 goto decerr; 204 205 pstr = pval; 206 pm = pstr->data; 207 pmlen = pstr->length; 208 if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) 209 goto decerr; 210 /* We have parameters now set private key */ 211 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) { 212 DHerror(DH_R_BN_ERROR); 213 goto dherr; 214 } 215 /* Calculate public key */ 216 if (!DH_generate_key(dh)) 217 goto dherr; 218 219 EVP_PKEY_assign_DH(pkey, dh); 220 221 ASN1_INTEGER_free(privkey); 222 223 return 1; 224 225 decerr: 226 DHerror(EVP_R_DECODE_ERROR); 227 dherr: 228 ASN1_INTEGER_free(privkey); 229 DH_free(dh); 230 return 0; 231 } 232 233 static int 234 dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) 235 { 236 ASN1_STRING *params = NULL; 237 ASN1_INTEGER *prkey = NULL; 238 unsigned char *dp = NULL; 239 int dplen; 240 241 params = ASN1_STRING_new(); 242 243 if (!params) { 244 DHerror(ERR_R_MALLOC_FAILURE); 245 goto err; 246 } 247 248 params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data); 249 if (params->length <= 0) { 250 DHerror(ERR_R_MALLOC_FAILURE); 251 goto err; 252 } 253 params->type = V_ASN1_SEQUENCE; 254 255 /* Get private key into integer */ 256 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL); 257 258 if (!prkey) { 259 DHerror(DH_R_BN_ERROR); 260 goto err; 261 } 262 263 dplen = i2d_ASN1_INTEGER(prkey, &dp); 264 265 ASN1_INTEGER_free(prkey); 266 prkey = NULL; 267 268 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0, 269 V_ASN1_SEQUENCE, params, dp, dplen)) 270 goto err; 271 272 return 1; 273 274 err: 275 free(dp); 276 ASN1_STRING_free(params); 277 ASN1_INTEGER_free(prkey); 278 return 0; 279 } 280 281 static void 282 update_buflen(const BIGNUM *b, size_t *pbuflen) 283 { 284 size_t i; 285 286 if (!b) 287 return; 288 if (*pbuflen < (i = (size_t)BN_num_bytes(b))) 289 *pbuflen = i; 290 } 291 292 static int 293 dh_param_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen) 294 { 295 DH *dh; 296 297 if (!(dh = d2i_DHparams(NULL, pder, derlen))) { 298 DHerror(ERR_R_DH_LIB); 299 return 0; 300 } 301 EVP_PKEY_assign_DH(pkey, dh); 302 return 1; 303 } 304 305 static int 306 dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder) 307 { 308 return i2d_DHparams(pkey->pkey.dh, pder); 309 } 310 311 static int 312 do_dh_print(BIO *bp, const DH *x, int indent, ASN1_PCTX *ctx, int ptype) 313 { 314 unsigned char *m = NULL; 315 int reason = ERR_R_BUF_LIB, ret = 0; 316 size_t buf_len = 0; 317 const char *ktype = NULL; 318 BIGNUM *priv_key, *pub_key; 319 320 if (ptype == 2) 321 priv_key = x->priv_key; 322 else 323 priv_key = NULL; 324 325 if (ptype > 0) 326 pub_key = x->pub_key; 327 else 328 pub_key = NULL; 329 330 update_buflen(x->p, &buf_len); 331 332 if (buf_len == 0) { 333 reason = ERR_R_PASSED_NULL_PARAMETER; 334 goto err; 335 } 336 337 update_buflen(x->g, &buf_len); 338 update_buflen(pub_key, &buf_len); 339 update_buflen(priv_key, &buf_len); 340 341 if (ptype == 2) 342 ktype = "PKCS#3 DH Private-Key"; 343 else if (ptype == 1) 344 ktype = "PKCS#3 DH Public-Key"; 345 else 346 ktype = "PKCS#3 DH Parameters"; 347 348 m= malloc(buf_len + 10); 349 if (m == NULL) { 350 reason = ERR_R_MALLOC_FAILURE; 351 goto err; 352 } 353 354 BIO_indent(bp, indent, 128); 355 if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0) 356 goto err; 357 indent += 4; 358 359 if (!ASN1_bn_print(bp, "private-key:", priv_key, m, indent)) 360 goto err; 361 if (!ASN1_bn_print(bp, "public-key:", pub_key, m, indent)) 362 goto err; 363 364 if (!ASN1_bn_print(bp, "prime:", x->p, m, indent)) 365 goto err; 366 if (!ASN1_bn_print(bp, "generator:", x->g, m, indent)) 367 goto err; 368 if (x->length != 0) { 369 BIO_indent(bp, indent, 128); 370 if (BIO_printf(bp, "recommended-private-length: %d bits\n", 371 (int)x->length) <= 0) 372 goto err; 373 } 374 375 ret = 1; 376 if (0) { 377 err: 378 DHerror(reason); 379 } 380 free(m); 381 return(ret); 382 } 383 384 static int 385 int_dh_size(const EVP_PKEY *pkey) 386 { 387 return DH_size(pkey->pkey.dh); 388 } 389 390 static int 391 dh_bits(const EVP_PKEY *pkey) 392 { 393 return BN_num_bits(pkey->pkey.dh->p); 394 } 395 396 static int 397 dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) 398 { 399 if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) || 400 BN_cmp(a->pkey.dh->g, b->pkey.dh->g)) 401 return 0; 402 else 403 return 1; 404 } 405 406 static int 407 dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) 408 { 409 BIGNUM *a; 410 411 if ((a = BN_dup(from->pkey.dh->p)) == NULL) 412 return 0; 413 BN_free(to->pkey.dh->p); 414 to->pkey.dh->p = a; 415 416 if ((a = BN_dup(from->pkey.dh->g)) == NULL) 417 return 0; 418 BN_free(to->pkey.dh->g); 419 to->pkey.dh->g = a; 420 421 return 1; 422 } 423 424 static int 425 dh_missing_parameters(const EVP_PKEY *a) 426 { 427 if (!a->pkey.dh->p || !a->pkey.dh->g) 428 return 1; 429 return 0; 430 } 431 432 static int 433 dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) 434 { 435 if (dh_cmp_parameters(a, b) == 0) 436 return 0; 437 if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0) 438 return 0; 439 else 440 return 1; 441 } 442 443 static int 444 dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) 445 { 446 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0); 447 } 448 449 static int 450 dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) 451 { 452 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1); 453 } 454 455 static int 456 dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx) 457 { 458 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2); 459 } 460 461 int 462 DHparams_print(BIO *bp, const DH *x) 463 { 464 return do_dh_print(bp, x, 4, NULL, 0); 465 } 466 467 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = { 468 .pkey_id = EVP_PKEY_DH, 469 .pkey_base_id = EVP_PKEY_DH, 470 471 .pem_str = "DH", 472 .info = "OpenSSL PKCS#3 DH method", 473 474 .pub_decode = dh_pub_decode, 475 .pub_encode = dh_pub_encode, 476 .pub_cmp = dh_pub_cmp, 477 .pub_print = dh_public_print, 478 479 .priv_decode = dh_priv_decode, 480 .priv_encode = dh_priv_encode, 481 .priv_print = dh_private_print, 482 483 .pkey_size = int_dh_size, 484 .pkey_bits = dh_bits, 485 486 .param_decode = dh_param_decode, 487 .param_encode = dh_param_encode, 488 .param_missing = dh_missing_parameters, 489 .param_copy = dh_copy_parameters, 490 .param_cmp = dh_cmp_parameters, 491 .param_print = dh_param_print, 492 493 .pkey_free = int_dh_free, 494 }; 495