1 /* $OpenBSD: x_pubkey.c,v 1.26 2017/01/29 17:49:22 beck Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/opensslconf.h> 62 63 #include <openssl/asn1t.h> 64 #include <openssl/err.h> 65 #include <openssl/x509.h> 66 67 #ifndef OPENSSL_NO_DSA 68 #include <openssl/dsa.h> 69 #endif 70 #ifndef OPENSSL_NO_RSA 71 #include <openssl/rsa.h> 72 #endif 73 74 #include "asn1_locl.h" 75 76 /* Minor tweak to operation: free up EVP_PKEY */ 77 static int 78 pubkey_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg) 79 { 80 if (operation == ASN1_OP_FREE_POST) { 81 X509_PUBKEY *pubkey = (X509_PUBKEY *)*pval; 82 EVP_PKEY_free(pubkey->pkey); 83 } 84 return 1; 85 } 86 87 static const ASN1_AUX X509_PUBKEY_aux = { 88 .asn1_cb = pubkey_cb, 89 }; 90 static const ASN1_TEMPLATE X509_PUBKEY_seq_tt[] = { 91 { 92 .offset = offsetof(X509_PUBKEY, algor), 93 .field_name = "algor", 94 .item = &X509_ALGOR_it, 95 }, 96 { 97 .offset = offsetof(X509_PUBKEY, public_key), 98 .field_name = "public_key", 99 .item = &ASN1_BIT_STRING_it, 100 }, 101 }; 102 103 const ASN1_ITEM X509_PUBKEY_it = { 104 .itype = ASN1_ITYPE_SEQUENCE, 105 .utype = V_ASN1_SEQUENCE, 106 .templates = X509_PUBKEY_seq_tt, 107 .tcount = sizeof(X509_PUBKEY_seq_tt) / sizeof(ASN1_TEMPLATE), 108 .funcs = &X509_PUBKEY_aux, 109 .size = sizeof(X509_PUBKEY), 110 .sname = "X509_PUBKEY", 111 }; 112 113 114 X509_PUBKEY * 115 d2i_X509_PUBKEY(X509_PUBKEY **a, const unsigned char **in, long len) 116 { 117 return (X509_PUBKEY *)ASN1_item_d2i((ASN1_VALUE **)a, in, len, 118 &X509_PUBKEY_it); 119 } 120 121 int 122 i2d_X509_PUBKEY(X509_PUBKEY *a, unsigned char **out) 123 { 124 return ASN1_item_i2d((ASN1_VALUE *)a, out, &X509_PUBKEY_it); 125 } 126 127 X509_PUBKEY * 128 X509_PUBKEY_new(void) 129 { 130 return (X509_PUBKEY *)ASN1_item_new(&X509_PUBKEY_it); 131 } 132 133 void 134 X509_PUBKEY_free(X509_PUBKEY *a) 135 { 136 ASN1_item_free((ASN1_VALUE *)a, &X509_PUBKEY_it); 137 } 138 139 int 140 X509_PUBKEY_set(X509_PUBKEY **x, EVP_PKEY *pkey) 141 { 142 X509_PUBKEY *pk = NULL; 143 144 if (x == NULL) 145 return (0); 146 if ((pk = X509_PUBKEY_new()) == NULL) 147 goto error; 148 149 if (pkey->ameth) { 150 if (pkey->ameth->pub_encode) { 151 if (!pkey->ameth->pub_encode(pk, pkey)) { 152 X509error(X509_R_PUBLIC_KEY_ENCODE_ERROR); 153 goto error; 154 } 155 } else { 156 X509error(X509_R_METHOD_NOT_SUPPORTED); 157 goto error; 158 } 159 } else { 160 X509error(X509_R_UNSUPPORTED_ALGORITHM); 161 goto error; 162 } 163 164 if (*x != NULL) 165 X509_PUBKEY_free(*x); 166 167 *x = pk; 168 169 return 1; 170 171 error: 172 if (pk != NULL) 173 X509_PUBKEY_free(pk); 174 return 0; 175 } 176 177 EVP_PKEY * 178 X509_PUBKEY_get(X509_PUBKEY *key) 179 { 180 EVP_PKEY *ret = NULL; 181 182 if (key == NULL) 183 goto error; 184 185 if (key->pkey != NULL) { 186 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY); 187 return key->pkey; 188 } 189 190 if (key->public_key == NULL) 191 goto error; 192 193 if ((ret = EVP_PKEY_new()) == NULL) { 194 X509error(ERR_R_MALLOC_FAILURE); 195 goto error; 196 } 197 198 if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm))) { 199 X509error(X509_R_UNSUPPORTED_ALGORITHM); 200 goto error; 201 } 202 203 if (ret->ameth->pub_decode) { 204 if (!ret->ameth->pub_decode(ret, key)) { 205 X509error(X509_R_PUBLIC_KEY_DECODE_ERROR); 206 goto error; 207 } 208 } else { 209 X509error(X509_R_METHOD_NOT_SUPPORTED); 210 goto error; 211 } 212 213 /* Check to see if another thread set key->pkey first */ 214 CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY); 215 if (key->pkey) { 216 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY); 217 EVP_PKEY_free(ret); 218 ret = key->pkey; 219 } else { 220 key->pkey = ret; 221 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY); 222 } 223 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY); 224 225 return ret; 226 227 error: 228 EVP_PKEY_free(ret); 229 return (NULL); 230 } 231 232 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure 233 * and encode or decode as X509_PUBKEY 234 */ 235 236 EVP_PKEY * 237 d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length) 238 { 239 X509_PUBKEY *xpk; 240 EVP_PKEY *pktmp; 241 xpk = d2i_X509_PUBKEY(NULL, pp, length); 242 if (!xpk) 243 return NULL; 244 pktmp = X509_PUBKEY_get(xpk); 245 X509_PUBKEY_free(xpk); 246 if (!pktmp) 247 return NULL; 248 if (a) { 249 EVP_PKEY_free(*a); 250 *a = pktmp; 251 } 252 return pktmp; 253 } 254 255 int 256 i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp) 257 { 258 X509_PUBKEY *xpk = NULL; 259 int ret; 260 if (!a) 261 return 0; 262 if (!X509_PUBKEY_set(&xpk, a)) 263 return 0; 264 ret = i2d_X509_PUBKEY(xpk, pp); 265 X509_PUBKEY_free(xpk); 266 return ret; 267 } 268 269 /* The following are equivalents but which return RSA and DSA 270 * keys 271 */ 272 #ifndef OPENSSL_NO_RSA 273 RSA * 274 d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length) 275 { 276 EVP_PKEY *pkey; 277 RSA *key; 278 const unsigned char *q; 279 q = *pp; 280 pkey = d2i_PUBKEY(NULL, &q, length); 281 if (!pkey) 282 return NULL; 283 key = EVP_PKEY_get1_RSA(pkey); 284 EVP_PKEY_free(pkey); 285 if (!key) 286 return NULL; 287 *pp = q; 288 if (a) { 289 RSA_free(*a); 290 *a = key; 291 } 292 return key; 293 } 294 295 int 296 i2d_RSA_PUBKEY(RSA *a, unsigned char **pp) 297 { 298 EVP_PKEY *pktmp; 299 int ret; 300 if (!a) 301 return 0; 302 pktmp = EVP_PKEY_new(); 303 if (!pktmp) { 304 ASN1error(ERR_R_MALLOC_FAILURE); 305 return 0; 306 } 307 EVP_PKEY_set1_RSA(pktmp, a); 308 ret = i2d_PUBKEY(pktmp, pp); 309 EVP_PKEY_free(pktmp); 310 return ret; 311 } 312 #endif 313 314 #ifndef OPENSSL_NO_DSA 315 DSA * 316 d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length) 317 { 318 EVP_PKEY *pkey; 319 DSA *key; 320 const unsigned char *q; 321 q = *pp; 322 pkey = d2i_PUBKEY(NULL, &q, length); 323 if (!pkey) 324 return NULL; 325 key = EVP_PKEY_get1_DSA(pkey); 326 EVP_PKEY_free(pkey); 327 if (!key) 328 return NULL; 329 *pp = q; 330 if (a) { 331 DSA_free(*a); 332 *a = key; 333 } 334 return key; 335 } 336 337 int 338 i2d_DSA_PUBKEY(DSA *a, unsigned char **pp) 339 { 340 EVP_PKEY *pktmp; 341 int ret; 342 if (!a) 343 return 0; 344 pktmp = EVP_PKEY_new(); 345 if (!pktmp) { 346 ASN1error(ERR_R_MALLOC_FAILURE); 347 return 0; 348 } 349 EVP_PKEY_set1_DSA(pktmp, a); 350 ret = i2d_PUBKEY(pktmp, pp); 351 EVP_PKEY_free(pktmp); 352 return ret; 353 } 354 #endif 355 356 #ifndef OPENSSL_NO_EC 357 EC_KEY * 358 d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length) 359 { 360 EVP_PKEY *pkey; 361 EC_KEY *key; 362 const unsigned char *q; 363 q = *pp; 364 pkey = d2i_PUBKEY(NULL, &q, length); 365 if (!pkey) 366 return (NULL); 367 key = EVP_PKEY_get1_EC_KEY(pkey); 368 EVP_PKEY_free(pkey); 369 if (!key) 370 return (NULL); 371 *pp = q; 372 if (a) { 373 EC_KEY_free(*a); 374 *a = key; 375 } 376 return (key); 377 } 378 379 int 380 i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp) 381 { 382 EVP_PKEY *pktmp; 383 int ret; 384 if (!a) 385 return (0); 386 if ((pktmp = EVP_PKEY_new()) == NULL) { 387 ASN1error(ERR_R_MALLOC_FAILURE); 388 return (0); 389 } 390 EVP_PKEY_set1_EC_KEY(pktmp, a); 391 ret = i2d_PUBKEY(pktmp, pp); 392 EVP_PKEY_free(pktmp); 393 return (ret); 394 } 395 #endif 396 397 int 398 X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj, int ptype, 399 void *pval, unsigned char *penc, int penclen) 400 { 401 if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval)) 402 return 0; 403 if (penc) { 404 free(pub->public_key->data); 405 pub->public_key->data = penc; 406 pub->public_key->length = penclen; 407 /* Set number of unused bits to zero */ 408 pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); 409 pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT; 410 } 411 return 1; 412 } 413 414 int 415 X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg, const unsigned char **pk, 416 int *ppklen, X509_ALGOR **pa, X509_PUBKEY *pub) 417 { 418 if (ppkalg) 419 *ppkalg = pub->algor->algorithm; 420 if (pk) { 421 *pk = pub->public_key->data; 422 *ppklen = pub->public_key->length; 423 } 424 if (pa) 425 *pa = pub->algor; 426 return 1; 427 } 428