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(const 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_UP_REF(&pkey->references, &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_POLY1305
 253 const unsigned char *EVP_PKEY_get0_poly1305(const EVP_PKEY *pkey, size_t *len)
 254 {
 255     ASN1_OCTET_STRING *os = NULL;
 256     if (pkey->type != EVP_PKEY_POLY1305) {
 257         EVPerr(EVP_F_EVP_PKEY_GET0_POLY1305, EVP_R_EXPECTING_A_POLY1305_KEY);
 258         return NULL;
 259     }
 260     os = EVP_PKEY_get0(pkey);
 261     *len = os->length;
 262     return os->data;
 263 }
 264 #endif
 265
 266 #ifndef OPENSSL_NO_RSA
 267 int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)
 268 {
 269     int ret = EVP_PKEY_assign_RSA(pkey, key);
 270     if (ret)
 271         RSA_up_ref(key);
 272     return ret;
 273 }
 274
 275 RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)
 276 {
 277     if (pkey->type != EVP_PKEY_RSA) {
 278         EVPerr(EVP_F_EVP_PKEY_GET0_RSA, EVP_R_EXPECTING_AN_RSA_KEY);
 279         return NULL;
 280     }
 281     return pkey->pkey.rsa;
 282 }
 283
 284 RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)
 285 {
 286     RSA *ret = EVP_PKEY_get0_RSA(pkey);
 287     if (ret != NULL)
 288         RSA_up_ref(ret);
 289     return ret;
 290 }
 291 #endif
 292
 293 #ifndef OPENSSL_NO_DSA
 294 int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)
 295 {
 296     int ret = EVP_PKEY_assign_DSA(pkey, key);
 297     if (ret)
 298         DSA_up_ref(key);
 299     return ret;
 300 }
 301
 302 DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey)
 303 {
 304     if (pkey->type != EVP_PKEY_DSA) {
 305         EVPerr(EVP_F_EVP_PKEY_GET0_DSA, EVP_R_EXPECTING_A_DSA_KEY);
 306         return NULL;
 307     }
 308     return pkey->pkey.dsa;
 309 }
 310
 311 DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)
 312 {
 313     DSA *ret = EVP_PKEY_get0_DSA(pkey);
 314     if (ret != NULL)
 315         DSA_up_ref(ret);
 316     return ret;
 317 }
 318 #endif
 319
 320 #ifndef OPENSSL_NO_EC
 321
 322 int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)
 323 {
 324     int ret = EVP_PKEY_assign_EC_KEY(pkey, key);
 325     if (ret)
 326         EC_KEY_up_ref(key);
 327     return ret;
 328 }
 329
 330 EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey)
 331 {
 332     if (pkey->type != EVP_PKEY_EC) {
 333         EVPerr(EVP_F_EVP_PKEY_GET0_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
 334         return NULL;
 335     }
 336     return pkey->pkey.ec;
 337 }
 338
 339 EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)
 340 {
 341     EC_KEY *ret = EVP_PKEY_get0_EC_KEY(pkey);
 342     if (ret != NULL)
 343         EC_KEY_up_ref(ret);
 344     return ret;
 345 }
 346 #endif
 347
 348 #ifndef OPENSSL_NO_DH
 349
 350 int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)
 351 {
 352     int ret = EVP_PKEY_assign_DH(pkey, key);
 353     if (ret)
 354         DH_up_ref(key);
 355     return ret;
 356 }
 357
 358 DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey)
 359 {
 360     if (pkey->type != EVP_PKEY_DH && pkey->type != EVP_PKEY_DHX) {
 361         EVPerr(EVP_F_EVP_PKEY_GET0_DH, EVP_R_EXPECTING_A_DH_KEY);
 362         return NULL;
 363     }
 364     return pkey->pkey.dh;
 365 }
 366
 367 DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)
 368 {
 369     DH *ret = EVP_PKEY_get0_DH(pkey);
 370     if (ret != NULL)
 371         DH_up_ref(ret);
 372     return ret;
 373 }
 374 #endif
 375
 376 int EVP_PKEY_type(int type)
 377 {
 378     int ret;
 379     const EVP_PKEY_ASN1_METHOD *ameth;
 380     ENGINE *e;
 381     ameth = EVP_PKEY_asn1_find(&e, type);
 382     if (ameth)
 383         ret = ameth->pkey_id;
 384     else
 385         ret = NID_undef;
 386 #ifndef OPENSSL_NO_ENGINE
 387     ENGINE_finish(e);
 388 #endif
 389     return ret;
 390 }
 391
 392 int EVP_PKEY_id(const EVP_PKEY *pkey)
 393 {
 394     return pkey->type;
 395 }
 396
 397 int EVP_PKEY_base_id(const EVP_PKEY *pkey)
 398 {
 399     return EVP_PKEY_type(pkey->type);
 400 }
 401
 402 void EVP_PKEY_free(EVP_PKEY *x)
 403 {
 404     int i;
 405
 406     if (x == NULL)
 407         return;
 408
 409     CRYPTO_DOWN_REF(&x->references, &i, x->lock);
 410     REF_PRINT_COUNT("EVP_PKEY", x);
 411     if (i > 0)
 412         return;
 413     REF_ASSERT_ISNT(i < 0);
 414     EVP_PKEY_free_it(x);
 415     CRYPTO_THREAD_lock_free(x->lock);
 416     sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
 417     OPENSSL_free(x);
 418 }
 419
 420 static void EVP_PKEY_free_it(EVP_PKEY *x)
 421 {
 422     /* internal function; x is never NULL */
 423     if (x->ameth && x->ameth->pkey_free) {
 424         x->ameth->pkey_free(x);
 425         x->pkey.ptr = NULL;
 426     }
 427 #ifndef OPENSSL_NO_ENGINE
 428     ENGINE_finish(x->engine);
 429     x->engine = NULL;
 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 static int evp_pkey_asn1_ctrl(EVP_PKEY *pkey, int op, int arg1, void *arg2)
 469 {
 470     if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
 471         return -2;
 472     return pkey->ameth->pkey_ctrl(pkey, op, arg1, arg2);
 473 }
 474
 475 int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)
 476 {
 477     return evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID, 0, pnid);
 478 }
 479
 480 int EVP_PKEY_set1_tls_encodedpoint(EVP_PKEY *pkey,
 481                                const unsigned char *pt, size_t ptlen)
 482 {
 483     if (ptlen > INT_MAX)
 484         return 0;
 485     if (evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_SET1_TLS_ENCPT, ptlen,
 486                            (void *)pt) <= 0)
 487         return 0;
 488     return 1;
 489 }
 490
 491 size_t EVP_PKEY_get1_tls_encodedpoint(EVP_PKEY *pkey, unsigned char **ppt)
 492 {
 493     int rv;
 494     rv = evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_GET1_TLS_ENCPT, 0, ppt);
 495     if (rv <= 0)
 496         return 0;
 497     return rv;
 498 }