1 /* $OpenBSD: x_pubkey.c,v 1.24 2015/02/11 03:39:51 jsing 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 X509err(X509_F_X509_PUBKEY_SET, 153 X509_R_PUBLIC_KEY_ENCODE_ERROR); 154 goto error; 155 } 156 } else { 157 X509err(X509_F_X509_PUBKEY_SET, 158 X509_R_METHOD_NOT_SUPPORTED); 159 goto error; 160 } 161 } else { 162 X509err(X509_F_X509_PUBKEY_SET, X509_R_UNSUPPORTED_ALGORITHM); 163 goto error; 164 } 165 166 if (*x != NULL) 167 X509_PUBKEY_free(*x); 168 169 *x = pk; 170 171 return 1; 172 173 error: 174 if (pk != NULL) 175 X509_PUBKEY_free(pk); 176 return 0; 177 } 178 179 EVP_PKEY * 180 X509_PUBKEY_get(X509_PUBKEY *key) 181 { 182 EVP_PKEY *ret = NULL; 183 184 if (key == NULL) 185 goto error; 186 187 if (key->pkey != NULL) { 188 CRYPTO_add(&key->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY); 189 return key->pkey; 190 } 191 192 if (key->public_key == NULL) 193 goto error; 194 195 if ((ret = EVP_PKEY_new()) == NULL) { 196 X509err(X509_F_X509_PUBKEY_GET, ERR_R_MALLOC_FAILURE); 197 goto error; 198 } 199 200 if (!EVP_PKEY_set_type(ret, OBJ_obj2nid(key->algor->algorithm))) { 201 X509err(X509_F_X509_PUBKEY_GET, X509_R_UNSUPPORTED_ALGORITHM); 202 goto error; 203 } 204 205 if (ret->ameth->pub_decode) { 206 if (!ret->ameth->pub_decode(ret, key)) { 207 X509err(X509_F_X509_PUBKEY_GET, 208 X509_R_PUBLIC_KEY_DECODE_ERROR); 209 goto error; 210 } 211 } else { 212 X509err(X509_F_X509_PUBKEY_GET, X509_R_METHOD_NOT_SUPPORTED); 213 goto error; 214 } 215 216 /* Check to see if another thread set key->pkey first */ 217 CRYPTO_w_lock(CRYPTO_LOCK_EVP_PKEY); 218 if (key->pkey) { 219 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY); 220 EVP_PKEY_free(ret); 221 ret = key->pkey; 222 } else { 223 key->pkey = ret; 224 CRYPTO_w_unlock(CRYPTO_LOCK_EVP_PKEY); 225 } 226 CRYPTO_add(&ret->references, 1, CRYPTO_LOCK_EVP_PKEY); 227 228 return ret; 229 230 error: 231 EVP_PKEY_free(ret); 232 return (NULL); 233 } 234 235 /* Now two pseudo ASN1 routines that take an EVP_PKEY structure 236 * and encode or decode as X509_PUBKEY 237 */ 238 239 EVP_PKEY * 240 d2i_PUBKEY(EVP_PKEY **a, const unsigned char **pp, long length) 241 { 242 X509_PUBKEY *xpk; 243 EVP_PKEY *pktmp; 244 xpk = d2i_X509_PUBKEY(NULL, pp, length); 245 if (!xpk) 246 return NULL; 247 pktmp = X509_PUBKEY_get(xpk); 248 X509_PUBKEY_free(xpk); 249 if (!pktmp) 250 return NULL; 251 if (a) { 252 EVP_PKEY_free(*a); 253 *a = pktmp; 254 } 255 return pktmp; 256 } 257 258 int 259 i2d_PUBKEY(EVP_PKEY *a, unsigned char **pp) 260 { 261 X509_PUBKEY *xpk = NULL; 262 int ret; 263 if (!a) 264 return 0; 265 if (!X509_PUBKEY_set(&xpk, a)) 266 return 0; 267 ret = i2d_X509_PUBKEY(xpk, pp); 268 X509_PUBKEY_free(xpk); 269 return ret; 270 } 271 272 /* The following are equivalents but which return RSA and DSA 273 * keys 274 */ 275 #ifndef OPENSSL_NO_RSA 276 RSA * 277 d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length) 278 { 279 EVP_PKEY *pkey; 280 RSA *key; 281 const unsigned char *q; 282 q = *pp; 283 pkey = d2i_PUBKEY(NULL, &q, length); 284 if (!pkey) 285 return NULL; 286 key = EVP_PKEY_get1_RSA(pkey); 287 EVP_PKEY_free(pkey); 288 if (!key) 289 return NULL; 290 *pp = q; 291 if (a) { 292 RSA_free(*a); 293 *a = key; 294 } 295 return key; 296 } 297 298 int 299 i2d_RSA_PUBKEY(RSA *a, unsigned char **pp) 300 { 301 EVP_PKEY *pktmp; 302 int ret; 303 if (!a) 304 return 0; 305 pktmp = EVP_PKEY_new(); 306 if (!pktmp) { 307 ASN1err(ASN1_F_I2D_RSA_PUBKEY, ERR_R_MALLOC_FAILURE); 308 return 0; 309 } 310 EVP_PKEY_set1_RSA(pktmp, a); 311 ret = i2d_PUBKEY(pktmp, pp); 312 EVP_PKEY_free(pktmp); 313 return ret; 314 } 315 #endif 316 317 #ifndef OPENSSL_NO_DSA 318 DSA * 319 d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length) 320 { 321 EVP_PKEY *pkey; 322 DSA *key; 323 const unsigned char *q; 324 q = *pp; 325 pkey = d2i_PUBKEY(NULL, &q, length); 326 if (!pkey) 327 return NULL; 328 key = EVP_PKEY_get1_DSA(pkey); 329 EVP_PKEY_free(pkey); 330 if (!key) 331 return NULL; 332 *pp = q; 333 if (a) { 334 DSA_free(*a); 335 *a = key; 336 } 337 return key; 338 } 339 340 int 341 i2d_DSA_PUBKEY(DSA *a, unsigned char **pp) 342 { 343 EVP_PKEY *pktmp; 344 int ret; 345 if (!a) 346 return 0; 347 pktmp = EVP_PKEY_new(); 348 if (!pktmp) { 349 ASN1err(ASN1_F_I2D_DSA_PUBKEY, ERR_R_MALLOC_FAILURE); 350 return 0; 351 } 352 EVP_PKEY_set1_DSA(pktmp, a); 353 ret = i2d_PUBKEY(pktmp, pp); 354 EVP_PKEY_free(pktmp); 355 return ret; 356 } 357 #endif 358 359 #ifndef OPENSSL_NO_EC 360 EC_KEY * 361 d2i_EC_PUBKEY(EC_KEY **a, const unsigned char **pp, long length) 362 { 363 EVP_PKEY *pkey; 364 EC_KEY *key; 365 const unsigned char *q; 366 q = *pp; 367 pkey = d2i_PUBKEY(NULL, &q, length); 368 if (!pkey) 369 return (NULL); 370 key = EVP_PKEY_get1_EC_KEY(pkey); 371 EVP_PKEY_free(pkey); 372 if (!key) 373 return (NULL); 374 *pp = q; 375 if (a) { 376 EC_KEY_free(*a); 377 *a = key; 378 } 379 return (key); 380 } 381 382 int 383 i2d_EC_PUBKEY(EC_KEY *a, unsigned char **pp) 384 { 385 EVP_PKEY *pktmp; 386 int ret; 387 if (!a) 388 return (0); 389 if ((pktmp = EVP_PKEY_new()) == NULL) { 390 ASN1err(ASN1_F_I2D_EC_PUBKEY, ERR_R_MALLOC_FAILURE); 391 return (0); 392 } 393 EVP_PKEY_set1_EC_KEY(pktmp, a); 394 ret = i2d_PUBKEY(pktmp, pp); 395 EVP_PKEY_free(pktmp); 396 return (ret); 397 } 398 #endif 399 400 int 401 X509_PUBKEY_set0_param(X509_PUBKEY *pub, ASN1_OBJECT *aobj, int ptype, 402 void *pval, unsigned char *penc, int penclen) 403 { 404 if (!X509_ALGOR_set0(pub->algor, aobj, ptype, pval)) 405 return 0; 406 if (penc) { 407 free(pub->public_key->data); 408 pub->public_key->data = penc; 409 pub->public_key->length = penclen; 410 /* Set number of unused bits to zero */ 411 pub->public_key->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); 412 pub->public_key->flags |= ASN1_STRING_FLAG_BITS_LEFT; 413 } 414 return 1; 415 } 416 417 int 418 X509_PUBKEY_get0_param(ASN1_OBJECT **ppkalg, const unsigned char **pk, 419 int *ppklen, X509_ALGOR **pa, X509_PUBKEY *pub) 420 { 421 if (ppkalg) 422 *ppkalg = pub->algor->algorithm; 423 if (pk) { 424 *pk = pub->public_key->data; 425 *ppklen = pub->public_key->length; 426 } 427 if (pa) 428 *pa = pub->algor; 429 return 1; 430 } 431