1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 2 * project 2006. 3 */ 4 /* ==================================================================== 5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * 3. All advertising materials mentioning features or use of this 20 * software must display the following acknowledgment: 21 * "This product includes software developed by the OpenSSL Project 22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 23 * 24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25 * endorse or promote products derived from this software without 26 * prior written permission. For written permission, please contact 27 * licensing (at) OpenSSL.org. 28 * 29 * 5. Products derived from this software may not be called "OpenSSL" 30 * nor may "OpenSSL" appear in their names without prior written 31 * permission of the OpenSSL Project. 32 * 33 * 6. Redistributions of any form whatsoever must retain the following 34 * acknowledgment: 35 * "This product includes software developed by the OpenSSL Project 36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49 * OF THE POSSIBILITY OF SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This product includes cryptographic software written by Eric Young 53 * (eay (at) cryptsoft.com). This product includes software written by Tim 54 * Hudson (tjh (at) cryptsoft.com). 55 * 56 */ 57 58 #include <stdio.h> 59 #include "cryptlib.h" 60 #include <openssl/x509.h> 61 #include <openssl/asn1.h> 62 #include <openssl/dh.h> 63 #include <openssl/bn.h> 64 #include "asn1_locl.h" 65 66 static void int_dh_free(EVP_PKEY *pkey) 67 { 68 DH_free(pkey->pkey.dh); 69 } 70 71 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) 72 { 73 const unsigned char *p, *pm; 74 int pklen, pmlen; 75 int ptype; 76 void *pval; 77 ASN1_STRING *pstr; 78 X509_ALGOR *palg; 79 ASN1_INTEGER *public_key = NULL; 80 81 DH *dh = NULL; 82 83 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) 84 return 0; 85 X509_ALGOR_get0(NULL, &ptype, &pval, palg); 86 87 if (ptype != V_ASN1_SEQUENCE) 88 { 89 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR); 90 goto err; 91 } 92 93 pstr = pval; 94 pm = pstr->data; 95 pmlen = pstr->length; 96 97 if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) 98 { 99 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); 100 goto err; 101 } 102 103 if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen))) 104 { 105 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR); 106 goto err; 107 } 108 109 /* We have parameters now set public key */ 110 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL))) 111 { 112 DHerr(DH_F_DH_PUB_DECODE, 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 if (dh) 124 DH_free(dh); 125 return 0; 126 127 } 128 129 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) 130 { 131 DH *dh; 132 void *pval = NULL; 133 int ptype; 134 unsigned char *penc = NULL; 135 int penclen; 136 ASN1_STRING *str; 137 ASN1_INTEGER *pub_key = NULL; 138 139 dh=pkey->pkey.dh; 140 141 str = ASN1_STRING_new(); 142 str->length = i2d_DHparams(dh, &str->data); 143 if (str->length <= 0) 144 { 145 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); 146 goto err; 147 } 148 pval = str; 149 ptype = V_ASN1_SEQUENCE; 150 151 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL); 152 if (!pub_key) 153 goto err; 154 155 penclen = i2d_ASN1_INTEGER(pub_key, &penc); 156 157 ASN1_INTEGER_free(pub_key); 158 159 if (penclen <= 0) 160 { 161 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE); 162 goto err; 163 } 164 165 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DH), 166 ptype, pval, penc, penclen)) 167 return 1; 168 169 err: 170 if (penc) 171 OPENSSL_free(penc); 172 if (pval) 173 ASN1_STRING_free(pval); 174 175 return 0; 176 } 177 178 179 /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in 180 * that the AlgorithmIdentifier contains the paramaters, the private key 181 * is explcitly included and the pubkey must be recalculated. 182 */ 183 184 static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) 185 { 186 const unsigned char *p, *pm; 187 int pklen, pmlen; 188 int ptype; 189 void *pval; 190 ASN1_STRING *pstr; 191 X509_ALGOR *palg; 192 ASN1_INTEGER *privkey = NULL; 193 194 DH *dh = NULL; 195 196 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) 197 return 0; 198 199 X509_ALGOR_get0(NULL, &ptype, &pval, palg); 200 201 if (ptype != V_ASN1_SEQUENCE) 202 goto decerr; 203 204 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen))) 205 goto decerr; 206 207 208 pstr = pval; 209 pm = pstr->data; 210 pmlen = pstr->length; 211 if (!(dh = d2i_DHparams(NULL, &pm, pmlen))) 212 goto decerr; 213 /* We have parameters now set private key */ 214 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL))) 215 { 216 DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR); 217 goto dherr; 218 } 219 /* Calculate public key */ 220 if (!DH_generate_key(dh)) 221 goto dherr; 222 223 EVP_PKEY_assign_DH(pkey, dh); 224 225 ASN1_INTEGER_free(privkey); 226 227 return 1; 228 229 decerr: 230 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR); 231 dherr: 232 DH_free(dh); 233 return 0; 234 } 235 236 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) 237 { 238 ASN1_STRING *params = NULL; 239 ASN1_INTEGER *prkey = NULL; 240 unsigned char *dp = NULL; 241 int dplen; 242 243 params = ASN1_STRING_new(); 244 245 if (!params) 246 { 247 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); 248 goto err; 249 } 250 251 params->length = i2d_DHparams(pkey->pkey.dh, ¶ms->data); 252 if (params->length <= 0) 253 { 254 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE); 255 goto err; 256 } 257 params->type = V_ASN1_SEQUENCE; 258 259 /* Get private key into integer */ 260 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL); 261 262 if (!prkey) 263 { 264 DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR); 265 goto err; 266 } 267 268 dplen = i2d_ASN1_INTEGER(prkey, &dp); 269 270 ASN1_INTEGER_free(prkey); 271 272 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_dhKeyAgreement), 0, 273 V_ASN1_SEQUENCE, params, dp, dplen)) 274 goto err; 275 276 return 1; 277 278 err: 279 if (dp != NULL) 280 OPENSSL_free(dp); 281 if (params != NULL) 282 ASN1_STRING_free(params); 283 if (prkey != NULL) 284 ASN1_INTEGER_free(prkey); 285 return 0; 286 } 287 288 289 static void update_buflen(const BIGNUM *b, size_t *pbuflen) 290 { 291 size_t i; 292 if (!b) 293 return; 294 if (*pbuflen < (i = (size_t)BN_num_bytes(b))) 295 *pbuflen = i; 296 } 297 298 static int dh_param_decode(EVP_PKEY *pkey, 299 const unsigned char **pder, int derlen) 300 { 301 DH *dh; 302 if (!(dh = d2i_DHparams(NULL, pder, derlen))) 303 { 304 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB); 305 return 0; 306 } 307 EVP_PKEY_assign_DH(pkey, dh); 308 return 1; 309 } 310 311 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder) 312 { 313 return i2d_DHparams(pkey->pkey.dh, pder); 314 } 315 316 static int do_dh_print(BIO *bp, const DH *x, int indent, 317 ASN1_PCTX *ctx, int ptype) 318 { 319 unsigned char *m=NULL; 320 int reason=ERR_R_BUF_LIB,ret=0; 321 size_t buf_len=0; 322 323 const char *ktype = NULL; 324 325 BIGNUM *priv_key, *pub_key; 326 327 if (ptype == 2) 328 priv_key = x->priv_key; 329 else 330 priv_key = NULL; 331 332 if (ptype > 0) 333 pub_key = x->pub_key; 334 else 335 pub_key = NULL; 336 337 update_buflen(x->p, &buf_len); 338 339 if (buf_len == 0) 340 { 341 reason = ERR_R_PASSED_NULL_PARAMETER; 342 goto err; 343 } 344 345 update_buflen(x->g, &buf_len); 346 update_buflen(pub_key, &buf_len); 347 update_buflen(priv_key, &buf_len); 348 349 if (ptype == 2) 350 ktype = "PKCS#3 DH Private-Key"; 351 else if (ptype == 1) 352 ktype = "PKCS#3 DH Public-Key"; 353 else 354 ktype = "PKCS#3 DH Parameters"; 355 356 m= OPENSSL_malloc(buf_len+10); 357 if (m == NULL) 358 { 359 reason=ERR_R_MALLOC_FAILURE; 360 goto err; 361 } 362 363 BIO_indent(bp, indent, 128); 364 if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0) 365 goto err; 366 indent += 4; 367 368 if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err; 369 if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err; 370 371 if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err; 372 if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err; 373 if (x->length != 0) 374 { 375 BIO_indent(bp, indent, 128); 376 if (BIO_printf(bp,"recommended-private-length: %d bits\n", 377 (int)x->length) <= 0) goto err; 378 } 379 380 381 ret=1; 382 if (0) 383 { 384 err: 385 DHerr(DH_F_DO_DH_PRINT,reason); 386 } 387 if (m != NULL) OPENSSL_free(m); 388 return(ret); 389 } 390 391 static int int_dh_size(const EVP_PKEY *pkey) 392 { 393 return(DH_size(pkey->pkey.dh)); 394 } 395 396 static int dh_bits(const EVP_PKEY *pkey) 397 { 398 return BN_num_bits(pkey->pkey.dh->p); 399 } 400 401 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) 402 { 403 if ( BN_cmp(a->pkey.dh->p,b->pkey.dh->p) || 404 BN_cmp(a->pkey.dh->g,b->pkey.dh->g)) 405 return 0; 406 else 407 return 1; 408 } 409 410 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) 411 { 412 BIGNUM *a; 413 414 if ((a=BN_dup(from->pkey.dh->p)) == NULL) 415 return 0; 416 if (to->pkey.dh->p != NULL) 417 BN_free(to->pkey.dh->p); 418 to->pkey.dh->p=a; 419 420 if ((a=BN_dup(from->pkey.dh->g)) == NULL) 421 return 0; 422 if (to->pkey.dh->g != NULL) 423 BN_free(to->pkey.dh->g); 424 to->pkey.dh->g=a; 425 426 return 1; 427 } 428 429 static int dh_missing_parameters(const EVP_PKEY *a) 430 { 431 if (!a->pkey.dh->p || !a->pkey.dh->g) 432 return 1; 433 return 0; 434 } 435 436 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) 437 { 438 if (dh_cmp_parameters(a, b) == 0) 439 return 0; 440 if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0) 441 return 0; 442 else 443 return 1; 444 } 445 446 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, 447 ASN1_PCTX *ctx) 448 { 449 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0); 450 } 451 452 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, 453 ASN1_PCTX *ctx) 454 { 455 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1); 456 } 457 458 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, 459 ASN1_PCTX *ctx) 460 { 461 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2); 462 } 463 464 int DHparams_print(BIO *bp, const DH *x) 465 { 466 return do_dh_print(bp, x, 4, NULL, 0); 467 } 468 469 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = 470 { 471 EVP_PKEY_DH, 472 EVP_PKEY_DH, 473 0, 474 475 "DH", 476 "OpenSSL PKCS#3 DH method", 477 478 dh_pub_decode, 479 dh_pub_encode, 480 dh_pub_cmp, 481 dh_public_print, 482 483 dh_priv_decode, 484 dh_priv_encode, 485 dh_private_print, 486 487 int_dh_size, 488 dh_bits, 489 490 dh_param_decode, 491 dh_param_encode, 492 dh_missing_parameters, 493 dh_copy_parameters, 494 dh_cmp_parameters, 495 dh_param_print, 496 0, 497 498 int_dh_free, 499 0 500 }; 501 502
