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      1 /* crypto/evp/p_lib.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 #include "cryptlib.h"
     61 #include <openssl/bn.h>
     62 #include <openssl/err.h>
     63 #include <openssl/objects.h>
     64 #include <openssl/evp.h>
     65 #include <openssl/asn1_mac.h>
     66 #include <openssl/x509.h>
     67 #ifndef OPENSSL_NO_RSA
     68 #include <openssl/rsa.h>
     69 #endif
     70 #ifndef OPENSSL_NO_DSA
     71 #include <openssl/dsa.h>
     72 #endif
     73 #ifndef OPENSSL_NO_DH
     74 #include <openssl/dh.h>
     75 #endif
     76 
     77 #ifndef OPENSSL_NO_ENGINE
     78 #include <openssl/engine.h>
     79 #endif
     80 
     81 #include "asn1_locl.h"
     82 
     83 static void EVP_PKEY_free_it(EVP_PKEY *x);
     84 
     85 int EVP_PKEY_bits(EVP_PKEY *pkey)
     86 	{
     87 	if (pkey && pkey->ameth && pkey->ameth->pkey_bits)
     88 		return pkey->ameth->pkey_bits(pkey);
     89 	return 0;
     90 	}
     91 
     92 int EVP_PKEY_size(EVP_PKEY *pkey)
     93 	{
     94 	if (pkey && pkey->ameth && pkey->ameth->pkey_size)
     95 		return pkey->ameth->pkey_size(pkey);
     96 	return 0;
     97 	}
     98 
     99 int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)
    100 	{
    101 #ifndef OPENSSL_NO_DSA
    102 	if (pkey->type == EVP_PKEY_DSA)
    103 		{
    104 		int ret=pkey->save_parameters;
    105 
    106 		if (mode >= 0)
    107 			pkey->save_parameters=mode;
    108 		return(ret);
    109 		}
    110 #endif
    111 #ifndef OPENSSL_NO_EC
    112 	if (pkey->type == EVP_PKEY_EC)
    113 		{
    114 		int ret = pkey->save_parameters;
    115 
    116 		if (mode >= 0)
    117 			pkey->save_parameters = mode;
    118 		return(ret);
    119 		}
    120 #endif
    121 	return(0);
    122 	}
    123 
    124 int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
    125 	{
    126 	if (to->type != from->type)
    127 		{
    128 		EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS,EVP_R_DIFFERENT_KEY_TYPES);
    129 		goto err;
    130 		}
    131 
    132 	if (EVP_PKEY_missing_parameters(from))
    133 		{
    134 		EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS,EVP_R_MISSING_PARAMETERS);
    135 		goto err;
    136 		}
    137 	if (from->ameth && from->ameth->param_copy)
    138 		return from->ameth->param_copy(to, from);
    139 err:
    140 	return 0;
    141 	}
    142 
    143 int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
    144 	{
    145 	if (pkey->ameth && pkey->ameth->param_missing)
    146 		return pkey->ameth->param_missing(pkey);
    147 	return 0;
    148 	}
    149 
    150 int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
    151 	{
    152 	if (a->type != b->type)
    153 		return -1;
    154 	if (a->ameth && a->ameth->param_cmp)
    155 		return a->ameth->param_cmp(a, b);
    156 	return -2;
    157 	}
    158 
    159 int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
    160 	{
    161 	if (a->type != b->type)
    162 		return -1;
    163 
    164 	if (a->ameth)
    165 		{
    166 		int ret;
    167 		/* Compare parameters if the algorithm has them */
    168 		if (a->ameth->param_cmp)
    169 			{
    170 			ret = a->ameth->param_cmp(a, b);
    171 			if (ret <= 0)
    172 				return ret;
    173 			}
    174 
    175 		if (a->ameth->pub_cmp)
    176 			return a->ameth->pub_cmp(a, b);
    177 		}
    178 
    179 	return -2;
    180 	}
    181 
    182 EVP_PKEY *EVP_PKEY_new(void)
    183 	{
    184 	EVP_PKEY *ret;
    185 
    186 	ret=(EVP_PKEY *)OPENSSL_malloc(sizeof(EVP_PKEY));
    187 	if (ret == NULL)
    188 		{
    189 		EVPerr(EVP_F_EVP_PKEY_NEW,ERR_R_MALLOC_FAILURE);
    190 		return(NULL);
    191 		}
    192 	ret->type=EVP_PKEY_NONE;
    193 	ret->save_type=EVP_PKEY_NONE;
    194 	ret->references=1;
    195 	ret->ameth=NULL;
    196 	ret->engine=NULL;
    197 	ret->pkey.ptr=NULL;
    198 	ret->attributes=NULL;
    199 	ret->save_parameters=1;
    200 	return(ret);
    201 	}
    202 
    203 EVP_PKEY *EVP_PKEY_dup(EVP_PKEY *pkey)
    204 	{
    205 	CRYPTO_add(&pkey->references,1,CRYPTO_LOCK_EVP_PKEY);
    206 	return pkey;
    207 	}
    208 
    209 /* Setup a public key ASN1 method and ENGINE from a NID or a string.
    210  * If pkey is NULL just return 1 or 0 if the algorithm exists.
    211  */
    212 
    213 static int pkey_set_type(EVP_PKEY *pkey, int type, const char *str, int len)
    214 	{
    215 	const EVP_PKEY_ASN1_METHOD *ameth;
    216 	ENGINE *e = NULL;
    217 	if (pkey)
    218 		{
    219 		if (pkey->pkey.ptr)
    220 			EVP_PKEY_free_it(pkey);
    221 		/* If key type matches and a method exists then this
    222 		 * lookup has succeeded once so just indicate success.
    223 		 */
    224 		if ((type == pkey->save_type) && pkey->ameth)
    225 			return 1;
    226 #ifndef OPENSSL_NO_ENGINE
    227 		/* If we have an ENGINE release it */
    228 		if (pkey->engine)
    229 			{
    230 			ENGINE_finish(pkey->engine);
    231 			pkey->engine = NULL;
    232 			}
    233 #endif
    234 		}
    235 	if (str)
    236 		ameth = EVP_PKEY_asn1_find_str(&e, str, len);
    237 	else
    238 		ameth = EVP_PKEY_asn1_find(&e, type);
    239 #ifndef OPENSSL_NO_ENGINE
    240 	if (!pkey && e)
    241 		ENGINE_finish(e);
    242 #endif
    243 	if (!ameth)
    244 		{
    245 		EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);
    246 		return 0;
    247 		}
    248 	if (pkey)
    249 		{
    250 		pkey->ameth = ameth;
    251 		pkey->engine = e;
    252 
    253 		pkey->type = pkey->ameth->pkey_id;
    254 		pkey->save_type=type;
    255 		}
    256 	return 1;
    257 	}
    258 
    259 int EVP_PKEY_set_type(EVP_PKEY *pkey, int type)
    260 	{
    261 	return pkey_set_type(pkey, type, NULL, -1);
    262 	}
    263 
    264 int EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)
    265 	{
    266 	return pkey_set_type(pkey, EVP_PKEY_NONE, str, len);
    267 	}
    268 
    269 int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)
    270 	{
    271 	if (!EVP_PKEY_set_type(pkey, type))
    272 		return 0;
    273 	pkey->pkey.ptr=key;
    274 	return (key != NULL);
    275 	}
    276 
    277 void *EVP_PKEY_get0(EVP_PKEY *pkey)
    278 	{
    279 	return pkey->pkey.ptr;
    280 	}
    281 
    282 #ifndef OPENSSL_NO_RSA
    283 int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)
    284 {
    285 	int ret = EVP_PKEY_assign_RSA(pkey, key);
    286 	if(ret)
    287 		RSA_up_ref(key);
    288 	return ret;
    289 }
    290 
    291 RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)
    292 	{
    293 	if(pkey->type != EVP_PKEY_RSA) {
    294 		EVPerr(EVP_F_EVP_PKEY_GET1_RSA, EVP_R_EXPECTING_AN_RSA_KEY);
    295 		return NULL;
    296 	}
    297 	RSA_up_ref(pkey->pkey.rsa);
    298 	return pkey->pkey.rsa;
    299 }
    300 #endif
    301 
    302 #ifndef OPENSSL_NO_DSA
    303 int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)
    304 {
    305 	int ret = EVP_PKEY_assign_DSA(pkey, key);
    306 	if(ret)
    307 		DSA_up_ref(key);
    308 	return ret;
    309 }
    310 
    311 DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)
    312 	{
    313 	if(pkey->type != EVP_PKEY_DSA) {
    314 		EVPerr(EVP_F_EVP_PKEY_GET1_DSA, EVP_R_EXPECTING_A_DSA_KEY);
    315 		return NULL;
    316 	}
    317 	DSA_up_ref(pkey->pkey.dsa);
    318 	return pkey->pkey.dsa;
    319 }
    320 #endif
    321 
    322 #ifndef OPENSSL_NO_EC
    323 
    324 int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)
    325 {
    326 	int ret = EVP_PKEY_assign_EC_KEY(pkey,key);
    327 	if (ret)
    328 		EC_KEY_up_ref(key);
    329 	return ret;
    330 }
    331 
    332 EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)
    333 {
    334 	if (pkey->type != EVP_PKEY_EC)
    335 	{
    336 		EVPerr(EVP_F_EVP_PKEY_GET1_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
    337 		return NULL;
    338 	}
    339 	EC_KEY_up_ref(pkey->pkey.ec);
    340 	return pkey->pkey.ec;
    341 }
    342 #endif
    343 
    344 
    345 #ifndef OPENSSL_NO_DH
    346 
    347 int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)
    348 {
    349 	int ret = EVP_PKEY_assign_DH(pkey, key);
    350 	if(ret)
    351 		DH_up_ref(key);
    352 	return ret;
    353 }
    354 
    355 DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)
    356 	{
    357 	if(pkey->type != EVP_PKEY_DH) {
    358 		EVPerr(EVP_F_EVP_PKEY_GET1_DH, EVP_R_EXPECTING_A_DH_KEY);
    359 		return NULL;
    360 	}
    361 	DH_up_ref(pkey->pkey.dh);
    362 	return pkey->pkey.dh;
    363 }
    364 #endif
    365 
    366 int EVP_PKEY_type(int type)
    367 	{
    368 	int ret;
    369 	const EVP_PKEY_ASN1_METHOD *ameth;
    370 	ENGINE *e;
    371 	ameth = EVP_PKEY_asn1_find(&e, type);
    372 	if (ameth)
    373 		ret = ameth->pkey_id;
    374 	else
    375 		ret = NID_undef;
    376 #ifndef OPENSSL_NO_ENGINE
    377 	if (e)
    378 		ENGINE_finish(e);
    379 #endif
    380 	return ret;
    381 	}
    382 
    383 int EVP_PKEY_id(const EVP_PKEY *pkey)
    384 	{
    385 	return pkey->type;
    386 	}
    387 
    388 int EVP_PKEY_base_id(const EVP_PKEY *pkey)
    389 	{
    390 	return EVP_PKEY_type(pkey->type);
    391 	}
    392 
    393 void EVP_PKEY_free(EVP_PKEY *x)
    394 	{
    395 	int i;
    396 
    397 	if (x == NULL) return;
    398 
    399 	i=CRYPTO_add(&x->references,-1,CRYPTO_LOCK_EVP_PKEY);
    400 #ifdef REF_PRINT
    401 	REF_PRINT("EVP_PKEY",x);
    402 #endif
    403 	if (i > 0) return;
    404 #ifdef REF_CHECK
    405 	if (i < 0)
    406 		{
    407 		fprintf(stderr,"EVP_PKEY_free, bad reference count\n");
    408 		abort();
    409 		}
    410 #endif
    411 	EVP_PKEY_free_it(x);
    412 	if (x->attributes)
    413 		sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
    414 	OPENSSL_free(x);
    415 	}
    416 
    417 static void EVP_PKEY_free_it(EVP_PKEY *x)
    418 	{
    419 	if (x->ameth && x->ameth->pkey_free)
    420 		{
    421 		x->ameth->pkey_free(x);
    422 		x->pkey.ptr = NULL;
    423 		}
    424 #ifndef OPENSSL_NO_ENGINE
    425 	if (x->engine)
    426 		{
    427 		ENGINE_finish(x->engine);
    428 		x->engine = NULL;
    429 		}
    430 #endif
    431 	}
    432 
    433 static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,
    434 				const char *kstr)
    435 	{
    436 	BIO_indent(out, indent, 128);
    437 	BIO_printf(out, "%s algorithm \"%s\" unsupported\n",
    438 						kstr, OBJ_nid2ln(pkey->type));
    439 	return 1;
    440 	}
    441 
    442 int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
    443 				int indent, ASN1_PCTX *pctx)
    444 	{
    445 	if (pkey->ameth && pkey->ameth->pub_print)
    446 		return pkey->ameth->pub_print(out, pkey, indent, pctx);
    447 
    448 	return unsup_alg(out, pkey, indent, "Public Key");
    449 	}
    450 
    451 int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
    452 				int indent, ASN1_PCTX *pctx)
    453 	{
    454 	if (pkey->ameth && pkey->ameth->priv_print)
    455 		return pkey->ameth->priv_print(out, pkey, indent, pctx);
    456 
    457 	return unsup_alg(out, pkey, indent, "Private Key");
    458 	}
    459 
    460 int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
    461 				int indent, ASN1_PCTX *pctx)
    462 	{
    463 	if (pkey->ameth && pkey->ameth->param_print)
    464 		return pkey->ameth->param_print(out, pkey, indent, pctx);
    465 	return unsup_alg(out, pkey, indent, "Parameters");
    466 	}
    467 
    468 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)
    469 	{
    470 	if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
    471 		return -2;
    472 	return pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID,
    473 						0, pnid);
    474 	}
    475 
    476