crypto/evp/p_lib.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/bn.h>
  13 #include <openssl/err.h>
  14 #include <openssl/objects.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/x509.h>
  17 #include <openssl/rsa.h>
  18 #include <openssl/dsa.h>
  19 #include <openssl/dh.h>
  20 #include <openssl/engine.h>
  21
  22 #include "internal/asn1_int.h"
  23 #include "internal/evp_int.h"
  24
  25 static void EVP_PKEY_free_it(EVP_PKEY *x);
  26
  27 int EVP_PKEY_bits(EVP_PKEY *pkey)
  28 {
  29     if (pkey && pkey->ameth && pkey->ameth->pkey_bits)
  30         return pkey->ameth->pkey_bits(pkey);
  31     return 0;
  32 }
  33
  34 int EVP_PKEY_security_bits(const EVP_PKEY *pkey)
  35 {
  36     if (pkey == NULL)
  37         return 0;
  38     if (!pkey->ameth || !pkey->ameth->pkey_security_bits)
  39         return -2;
  40     return pkey->ameth->pkey_security_bits(pkey);
  41 }
  42
  43 int EVP_PKEY_size(EVP_PKEY *pkey)
  44 {
  45     if (pkey && pkey->ameth && pkey->ameth->pkey_size)
  46         return pkey->ameth->pkey_size(pkey);
  47     return 0;
  48 }
  49
  50 int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)
  51 {
  52 #ifndef OPENSSL_NO_DSA
  53     if (pkey->type == EVP_PKEY_DSA) {
  54         int ret = pkey->save_parameters;
  55
  56         if (mode >= 0)
  57             pkey->save_parameters = mode;
  58         return (ret);
  59     }
  60 #endif
  61 #ifndef OPENSSL_NO_EC
  62     if (pkey->type == EVP_PKEY_EC) {
  63         int ret = pkey->save_parameters;
  64
  65         if (mode >= 0)
  66             pkey->save_parameters = mode;
  67         return (ret);
  68     }
  69 #endif
  70     return (0);
  71 }
  72
  73 int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
  74 {
  75     if (to->type == EVP_PKEY_NONE) {
  76         if (EVP_PKEY_set_type(to, from->type) == 0)
  77             return 0;
  78     } else if (to->type != from->type) {
  79         EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_KEY_TYPES);
  80         goto err;
  81     }
  82
  83     if (EVP_PKEY_missing_parameters(from)) {
  84         EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_MISSING_PARAMETERS);
  85         goto err;
  86     }
  87
  88     if (!EVP_PKEY_missing_parameters(to)) {
  89         if (EVP_PKEY_cmp_parameters(to, from) == 1)
  90             return 1;
  91         EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_PARAMETERS);
  92         return 0;
  93     }
  94
  95     if (from->ameth && from->ameth->param_copy)
  96         return from->ameth->param_copy(to, from);
  97  err:
  98     return 0;
  99 }
 100
 101 int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
 102 {
 103     if (pkey->ameth && pkey->ameth->param_missing)
 104         return pkey->ameth->param_missing(pkey);
 105     return 0;
 106 }
 107
 108 int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 109 {
 110     if (a->type != b->type)
 111         return -1;
 112     if (a->ameth && a->ameth->param_cmp)
 113         return a->ameth->param_cmp(a, b);
 114     return -2;
 115 }
 116
 117 int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 118 {
 119     if (a->type != b->type)
 120         return -1;
 121
 122     if (a->ameth) {
 123         int ret;
 124         /* Compare parameters if the algorithm has them */
 125         if (a->ameth->param_cmp) {
 126             ret = a->ameth->param_cmp(a, b);
 127             if (ret <= 0)
 128                 return ret;
 129         }
 130
 131         if (a->ameth->pub_cmp)
 132             return a->ameth->pub_cmp(a, b);
 133     }
 134
 135     return -2;
 136 }
 137
 138 EVP_PKEY *EVP_PKEY_new(void)
 139 {
 140     EVP_PKEY *ret = OPENSSL_zalloc(sizeof(*ret));
 141
 142     if (ret == NULL) {
 143         EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);
 144         return NULL;
 145     }
 146     ret->type = EVP_PKEY_NONE;
 147     ret->save_type = EVP_PKEY_NONE;
 148     ret->references = 1;
 149     ret->save_parameters = 1;
 150     ret->lock = CRYPTO_THREAD_lock_new();
 151     if (ret->lock == NULL) {
 152         EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);
 153         OPENSSL_free(ret);
 154         return NULL;
 155     }
 156     return ret;
 157 }
 158
 159 int EVP_PKEY_up_ref(EVP_PKEY *pkey)
 160 {
 161     int i;
 162
 163     if (CRYPTO_atomic_add(&pkey->references, 1, &i, pkey->lock) <= 0)
 164         return 0;
 165
 166     REF_PRINT_COUNT("EVP_PKEY", pkey);
 167     REF_ASSERT_ISNT(i < 2);
 168     return ((i > 1) ? 1 : 0);
 169 }
 170
 171 /*
 172  * Setup a public key ASN1 method and ENGINE from a NID or a string. If pkey
 173  * is NULL just return 1 or 0 if the algorithm exists.
 174  */
 175
 176 static int pkey_set_type(EVP_PKEY *pkey, int type, const char *str, int len)
 177 {
 178     const EVP_PKEY_ASN1_METHOD *ameth;
 179     ENGINE *e = NULL;
 180     if (pkey) {
 181         if (pkey->pkey.ptr)
 182             EVP_PKEY_free_it(pkey);
 183         /*
 184          * If key type matches and a method exists then this lookup has
 185          * succeeded once so just indicate success.
 186          */
 187         if ((type == pkey->save_type) && pkey->ameth)
 188             return 1;
 189 #ifndef OPENSSL_NO_ENGINE
 190         /* If we have an ENGINE release it */
 191         ENGINE_finish(pkey->engine);
 192         pkey->engine = NULL;
 193 #endif
 194     }
 195     if (str)
 196         ameth = EVP_PKEY_asn1_find_str(&e, str, len);
 197     else
 198         ameth = EVP_PKEY_asn1_find(&e, type);
 199 #ifndef OPENSSL_NO_ENGINE
 200     if (pkey == NULL)
 201         ENGINE_finish(e);
 202 #endif
 203     if (ameth == NULL) {
 204         EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);
 205         return 0;
 206     }
 207     if (pkey) {
 208         pkey->ameth = ameth;
 209         pkey->engine = e;
 210
 211         pkey->type = pkey->ameth->pkey_id;
 212         pkey->save_type = type;
 213     }
 214     return 1;
 215 }
 216
 217 int EVP_PKEY_set_type(EVP_PKEY *pkey, int type)
 218 {
 219     return pkey_set_type(pkey, type, NULL, -1);
 220 }
 221
 222 int EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)
 223 {
 224     return pkey_set_type(pkey, EVP_PKEY_NONE, str, len);
 225 }
 226
 227 int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)
 228 {
 229     if (pkey == NULL || !EVP_PKEY_set_type(pkey, type))
 230         return 0;
 231     pkey->pkey.ptr = key;
 232     return (key != NULL);
 233 }
 234
 235 void *EVP_PKEY_get0(const EVP_PKEY *pkey)
 236 {
 237     return pkey->pkey.ptr;
 238 }
 239
 240 const unsigned char *EVP_PKEY_get0_hmac(const EVP_PKEY *pkey, size_t *len)
 241 {
 242     ASN1_OCTET_STRING *os = NULL;
 243     if (pkey->type != EVP_PKEY_HMAC) {
 244         EVPerr(EVP_F_EVP_PKEY_GET0_HMAC, EVP_R_EXPECTING_AN_HMAC_KEY);
 245         return NULL;
 246     }
 247     os = EVP_PKEY_get0(pkey);
 248     *len = os->length;
 249     return os->data;
 250 }
 251
 252 #ifndef OPENSSL_NO_RSA
 253 int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)
 254 {
 255     int ret = EVP_PKEY_assign_RSA(pkey, key);
 256     if (ret)
 257         RSA_up_ref(key);
 258     return ret;
 259 }
 260
 261 RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)
 262 {
 263     if (pkey->type != EVP_PKEY_RSA) {
 264         EVPerr(EVP_F_EVP_PKEY_GET0_RSA, EVP_R_EXPECTING_AN_RSA_KEY);
 265         return NULL;
 266     }
 267     return pkey->pkey.rsa;
 268 }
 269
 270 RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)
 271 {
 272     RSA *ret = EVP_PKEY_get0_RSA(pkey);
 273     if (ret != NULL)
 274         RSA_up_ref(ret);
 275     return ret;
 276 }
 277 #endif
 278
 279 #ifndef OPENSSL_NO_DSA
 280 int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)
 281 {
 282     int ret = EVP_PKEY_assign_DSA(pkey, key);
 283     if (ret)
 284         DSA_up_ref(key);
 285     return ret;
 286 }
 287
 288 DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey)
 289 {
 290     if (pkey->type != EVP_PKEY_DSA) {
 291         EVPerr(EVP_F_EVP_PKEY_GET0_DSA, EVP_R_EXPECTING_A_DSA_KEY);
 292         return NULL;
 293     }
 294     return pkey->pkey.dsa;
 295 }
 296
 297 DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)
 298 {
 299     DSA *ret = EVP_PKEY_get0_DSA(pkey);
 300     if (ret != NULL)
 301         DSA_up_ref(ret);
 302     return ret;
 303 }
 304 #endif
 305
 306 #ifndef OPENSSL_NO_EC
 307
 308 int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)
 309 {
 310     int ret = EVP_PKEY_assign_EC_KEY(pkey, key);
 311     if (ret)
 312         EC_KEY_up_ref(key);
 313     return ret;
 314 }
 315
 316 EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey)
 317 {
 318     if (pkey->type != EVP_PKEY_EC) {
 319         EVPerr(EVP_F_EVP_PKEY_GET0_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
 320         return NULL;
 321     }
 322     return pkey->pkey.ec;
 323 }
 324
 325 EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)
 326 {
 327     EC_KEY *ret = EVP_PKEY_get0_EC_KEY(pkey);
 328     if (ret != NULL)
 329         EC_KEY_up_ref(ret);
 330     return ret;
 331 }
 332 #endif
 333
 334 #ifndef OPENSSL_NO_DH
 335
 336 int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)
 337 {
 338     int ret = EVP_PKEY_assign_DH(pkey, key);
 339     if (ret)
 340         DH_up_ref(key);
 341     return ret;
 342 }
 343
 344 DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey)
 345 {
 346     if (pkey->type != EVP_PKEY_DH && pkey->type != EVP_PKEY_DHX) {
 347         EVPerr(EVP_F_EVP_PKEY_GET0_DH, EVP_R_EXPECTING_A_DH_KEY);
 348         return NULL;
 349     }
 350     return pkey->pkey.dh;
 351 }
 352
 353 DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)
 354 {
 355     DH *ret = EVP_PKEY_get0_DH(pkey);
 356     if (ret != NULL)
 357         DH_up_ref(ret);
 358     return ret;
 359 }
 360 #endif
 361
 362 int EVP_PKEY_type(int type)
 363 {
 364     int ret;
 365     const EVP_PKEY_ASN1_METHOD *ameth;
 366     ENGINE *e;
 367     ameth = EVP_PKEY_asn1_find(&e, type);
 368     if (ameth)
 369         ret = ameth->pkey_id;
 370     else
 371         ret = NID_undef;
 372 #ifndef OPENSSL_NO_ENGINE
 373     ENGINE_finish(e);
 374 #endif
 375     return ret;
 376 }
 377
 378 int EVP_PKEY_id(const EVP_PKEY *pkey)
 379 {
 380     return pkey->type;
 381 }
 382
 383 int EVP_PKEY_base_id(const EVP_PKEY *pkey)
 384 {
 385     return EVP_PKEY_type(pkey->type);
 386 }
 387
 388 void EVP_PKEY_free(EVP_PKEY *x)
 389 {
 390     int i;
 391
 392     if (x == NULL)
 393         return;
 394
 395     CRYPTO_atomic_add(&x->references, -1, &i, x->lock);
 396     REF_PRINT_COUNT("EVP_PKEY", x);
 397     if (i > 0)
 398         return;
 399     REF_ASSERT_ISNT(i < 0);
 400     EVP_PKEY_free_it(x);
 401     sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
 402     OPENSSL_free(x);
 403 }
 404
 405 static void EVP_PKEY_free_it(EVP_PKEY *x)
 406 {
 407     /* internal function; x is never NULL */
 408     if (x->ameth && x->ameth->pkey_free) {
 409         x->ameth->pkey_free(x);
 410         x->pkey.ptr = NULL;
 411     }
 412 #ifndef OPENSSL_NO_ENGINE
 413     ENGINE_finish(x->engine);
 414     x->engine = NULL;
 415 #endif
 416     CRYPTO_THREAD_lock_free(x->lock);
 417 }
 418
 419 static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,
 420                      const char *kstr)
 421 {
 422     BIO_indent(out, indent, 128);
 423     BIO_printf(out, "%s algorithm \"%s\" unsupported\n",
 424                kstr, OBJ_nid2ln(pkey->type));
 425     return 1;
 426 }
 427
 428 int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
 429                           int indent, ASN1_PCTX *pctx)
 430 {
 431     if (pkey->ameth && pkey->ameth->pub_print)
 432         return pkey->ameth->pub_print(out, pkey, indent, pctx);
 433
 434     return unsup_alg(out, pkey, indent, "Public Key");
 435 }
 436
 437 int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
 438                            int indent, ASN1_PCTX *pctx)
 439 {
 440     if (pkey->ameth && pkey->ameth->priv_print)
 441         return pkey->ameth->priv_print(out, pkey, indent, pctx);
 442
 443     return unsup_alg(out, pkey, indent, "Private Key");
 444 }
 445
 446 int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
 447                           int indent, ASN1_PCTX *pctx)
 448 {
 449     if (pkey->ameth && pkey->ameth->param_print)
 450         return pkey->ameth->param_print(out, pkey, indent, pctx);
 451     return unsup_alg(out, pkey, indent, "Parameters");
 452 }
 453
 454 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)
 455 {
 456     if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
 457         return -2;
 458     return pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID,
 459                                   0, pnid);
 460 }