Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* Written by Dr Stephen N Henson (steve@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@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@cryptsoft.com). This product includes software written by Tim |
| 54 | * Hudson (tjh@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, |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 496 | |
| 497 | int_dh_free, |
| 498 | 0 |
| 499 | }; |
| 500 | |