crypto/engine/eng_openssl.c

   1 /* crypto/engine/eng_openssl.c */
   2 /*
   3  * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* ====================================================================
  60  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  61  * ECDH support in OpenSSL originally developed by
  62  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
  63  */
  64
  65 #include <stdio.h>
  66 #include <openssl/crypto.h>
  67 #include "cryptlib.h"
  68 #include <openssl/engine.h>
  69 #include <openssl/dso.h>
  70 #include <openssl/pem.h>
  71 #include <openssl/evp.h>
  72 #include <openssl/rand.h>
  73 #ifndef OPENSSL_NO_RSA
  74 # include <openssl/rsa.h>
  75 #endif
  76 #ifndef OPENSSL_NO_DSA
  77 # include <openssl/dsa.h>
  78 #endif
  79 #ifndef OPENSSL_NO_DH
  80 # include <openssl/dh.h>
  81 #endif
  82
  83 #include <openssl/hmac.h>
  84 #include <openssl/x509v3.h>
  85
  86 /*
  87  * This testing gunk is implemented (and explained) lower down. It also
  88  * assumes the application explicitly calls "ENGINE_load_openssl()" because
  89  * this is no longer automatic in ENGINE_load_builtin_engines().
  90  */
  91 #define TEST_ENG_OPENSSL_RC4
  92 #define TEST_ENG_OPENSSL_PKEY
  93 /* #define TEST_ENG_OPENSSL_HMAC */
  94 /* #define TEST_ENG_OPENSSL_HMAC_INIT */
  95 /* #define TEST_ENG_OPENSSL_RC4_OTHERS */
  96 #define TEST_ENG_OPENSSL_RC4_P_INIT
  97 /* #define TEST_ENG_OPENSSL_RC4_P_CIPHER */
  98 #define TEST_ENG_OPENSSL_SHA
  99 /* #define TEST_ENG_OPENSSL_SHA_OTHERS */
 100 /* #define TEST_ENG_OPENSSL_SHA_P_INIT */
 101 /* #define TEST_ENG_OPENSSL_SHA_P_UPDATE */
 102 /* #define TEST_ENG_OPENSSL_SHA_P_FINAL */
 103
 104 /* Now check what of those algorithms are actually enabled */
 105 #ifdef OPENSSL_NO_RC4
 106 # undef TEST_ENG_OPENSSL_RC4
 107 # undef TEST_ENG_OPENSSL_RC4_OTHERS
 108 # undef TEST_ENG_OPENSSL_RC4_P_INIT
 109 # undef TEST_ENG_OPENSSL_RC4_P_CIPHER
 110 #endif
 111 #if defined(OPENSSL_NO_SHA) || defined(OPENSSL_NO_SHA0) || defined(OPENSSL_NO_SHA1)
 112 # undef TEST_ENG_OPENSSL_SHA
 113 # undef TEST_ENG_OPENSSL_SHA_OTHERS
 114 # undef TEST_ENG_OPENSSL_SHA_P_INIT
 115 # undef TEST_ENG_OPENSSL_SHA_P_UPDATE
 116 # undef TEST_ENG_OPENSSL_SHA_P_FINAL
 117 #endif
 118
 119 #ifdef TEST_ENG_OPENSSL_RC4
 120 static int openssl_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 121                            const int **nids, int nid);
 122 #endif
 123 #ifdef TEST_ENG_OPENSSL_SHA
 124 static int openssl_digests(ENGINE *e, const EVP_MD **digest,
 125                            const int **nids, int nid);
 126 #endif
 127
 128 #ifdef TEST_ENG_OPENSSL_PKEY
 129 static EVP_PKEY *openssl_load_privkey(ENGINE *eng, const char *key_id,
 130                                       UI_METHOD *ui_method,
 131                                       void *callback_data);
 132 #endif
 133
 134 #ifdef TEST_ENG_OPENSSL_HMAC
 135 static int ossl_register_hmac_meth(void);
 136 static int ossl_pkey_meths(ENGINE *e, EVP_PKEY_METHOD **pmeth,
 137                            const int **nids, int nid);
 138 #endif
 139
 140 /* The constants used when creating the ENGINE */
 141 static const char *engine_openssl_id = "openssl";
 142 static const char *engine_openssl_name = "Software engine support";
 143
 144 /*
 145  * This internal function is used by ENGINE_openssl() and possibly by the
 146  * "dynamic" ENGINE support too
 147  */
 148 static int bind_helper(ENGINE *e)
 149 {
 150     if (!ENGINE_set_id(e, engine_openssl_id)
 151         || !ENGINE_set_name(e, engine_openssl_name)
 152 #ifndef TEST_ENG_OPENSSL_NO_ALGORITHMS
 153 # ifndef OPENSSL_NO_RSA
 154         || !ENGINE_set_RSA(e, RSA_get_default_method())
 155 # endif
 156 # ifndef OPENSSL_NO_DSA
 157         || !ENGINE_set_DSA(e, DSA_get_default_method())
 158 # endif
 159 # ifndef OPENSSL_NO_ECDH
 160         || !ENGINE_set_ECDH(e, ECDH_OpenSSL())
 161 # endif
 162 # ifndef OPENSSL_NO_ECDSA
 163         || !ENGINE_set_ECDSA(e, ECDSA_OpenSSL())
 164 # endif
 165 # ifndef OPENSSL_NO_DH
 166         || !ENGINE_set_DH(e, DH_get_default_method())
 167 # endif
 168         || !ENGINE_set_RAND(e, RAND_SSLeay())
 169 # ifdef TEST_ENG_OPENSSL_RC4
 170         || !ENGINE_set_ciphers(e, openssl_ciphers)
 171 # endif
 172 # ifdef TEST_ENG_OPENSSL_SHA
 173         || !ENGINE_set_digests(e, openssl_digests)
 174 # endif
 175 #endif
 176 #ifdef TEST_ENG_OPENSSL_PKEY
 177         || !ENGINE_set_load_privkey_function(e, openssl_load_privkey)
 178 #endif
 179 #ifdef TEST_ENG_OPENSSL_HMAC
 180         || !ossl_register_hmac_meth()
 181         || !ENGINE_set_pkey_meths(e, ossl_pkey_meths)
 182 #endif
 183         )
 184         return 0;
 185     /*
 186      * If we add errors to this ENGINE, ensure the error handling is setup
 187      * here
 188      */
 189     /* openssl_load_error_strings(); */
 190     return 1;
 191 }
 192
 193 static ENGINE *engine_openssl(void)
 194 {
 195     ENGINE *ret = ENGINE_new();
 196     if (!ret)
 197         return NULL;
 198     if (!bind_helper(ret)) {
 199         ENGINE_free(ret);
 200         return NULL;
 201     }
 202     return ret;
 203 }
 204
 205 void ENGINE_load_openssl(void)
 206 {
 207     ENGINE *toadd = engine_openssl();
 208     if (!toadd)
 209         return;
 210     ENGINE_add(toadd);
 211     /*
 212      * If the "add" worked, it gets a structural reference. So either way, we
 213      * release our just-created reference.
 214      */
 215     ENGINE_free(toadd);
 216     ERR_clear_error();
 217 }
 218
 219 /*
 220  * This stuff is needed if this ENGINE is being compiled into a
 221  * self-contained shared-library.
 222  */
 223 #ifdef ENGINE_DYNAMIC_SUPPORT
 224 static int bind_fn(ENGINE *e, const char *id)
 225 {
 226     if (id && (strcmp(id, engine_openssl_id) != 0))
 227         return 0;
 228     if (!bind_helper(e))
 229         return 0;
 230     return 1;
 231 }
 232
 233 IMPLEMENT_DYNAMIC_CHECK_FN()
 234     IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
 235 #endif                          /* ENGINE_DYNAMIC_SUPPORT */
 236 #ifdef TEST_ENG_OPENSSL_RC4
 237 /*-
 238  * This section of code compiles an "alternative implementation" of two modes of
 239  * RC4 into this ENGINE. The result is that EVP_CIPHER operation for "rc4"
 240  * should under normal circumstances go via this support rather than the default
 241  * EVP support. There are other symbols to tweak the testing;
 242  *    TEST_ENC_OPENSSL_RC4_OTHERS - print a one line message to stderr each time
 243  *        we're asked for a cipher we don't support (should not happen).
 244  *    TEST_ENG_OPENSSL_RC4_P_INIT - print a one line message to stderr each time
 245  *        the "init_key" handler is called.
 246  *    TEST_ENG_OPENSSL_RC4_P_CIPHER - ditto for the "cipher" handler.
 247  */
 248 # include <openssl/rc4.h>
 249 # define TEST_RC4_KEY_SIZE               16
 250 static const int test_cipher_nids[] = { NID_rc4, NID_rc4_40 };
 251
 252 static const int test_cipher_nids_number = 2;
 253 typedef struct {
 254     unsigned char key[TEST_RC4_KEY_SIZE];
 255     RC4_KEY ks;
 256 } TEST_RC4_KEY;
 257 # define test(ctx) ((TEST_RC4_KEY *)(ctx)->cipher_data)
 258 static int test_rc4_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
 259                              const unsigned char *iv, int enc)
 260 {
 261 # ifdef TEST_ENG_OPENSSL_RC4_P_INIT
 262     fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) test_init_key() called\n");
 263 # endif
 264     memcpy(&test(ctx)->key[0], key, EVP_CIPHER_CTX_key_length(ctx));
 265     RC4_set_key(&test(ctx)->ks, EVP_CIPHER_CTX_key_length(ctx),
 266                 test(ctx)->key);
 267     return 1;
 268 }
 269
 270 static int test_rc4_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 271                            const unsigned char *in, size_t inl)
 272 {
 273 # ifdef TEST_ENG_OPENSSL_RC4_P_CIPHER
 274     fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) test_cipher() called\n");
 275 # endif
 276     RC4(&test(ctx)->ks, inl, in, out);
 277     return 1;
 278 }
 279
 280 static const EVP_CIPHER test_r4_cipher = {
 281     NID_rc4,
 282     1, TEST_RC4_KEY_SIZE, 0,
 283     EVP_CIPH_VARIABLE_LENGTH,
 284     test_rc4_init_key,
 285     test_rc4_cipher,
 286     NULL,
 287     sizeof(TEST_RC4_KEY),
 288     NULL,
 289     NULL,
 290     NULL,
 291     NULL
 292 };
 293
 294 static const EVP_CIPHER test_r4_40_cipher = {
 295     NID_rc4_40,
 296     1, 5 /* 40 bit */ , 0,
 297     EVP_CIPH_VARIABLE_LENGTH,
 298     test_rc4_init_key,
 299     test_rc4_cipher,
 300     NULL,
 301     sizeof(TEST_RC4_KEY),
 302     NULL,
 303     NULL,
 304     NULL,
 305     NULL
 306 };
 307
 308 static int openssl_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 309                            const int **nids, int nid)
 310 {
 311     if (!cipher) {
 312         /* We are returning a list of supported nids */
 313         *nids = test_cipher_nids;
 314         return test_cipher_nids_number;
 315     }
 316     /* We are being asked for a specific cipher */
 317     if (nid == NID_rc4)
 318         *cipher = &test_r4_cipher;
 319     else if (nid == NID_rc4_40)
 320         *cipher = &test_r4_40_cipher;
 321     else {
 322 # ifdef TEST_ENG_OPENSSL_RC4_OTHERS
 323         fprintf(stderr, "(TEST_ENG_OPENSSL_RC4) returning NULL for "
 324                 "nid %d\n", nid);
 325 # endif
 326         *cipher = NULL;
 327         return 0;
 328     }
 329     return 1;
 330 }
 331 #endif
 332
 333 #ifdef TEST_ENG_OPENSSL_SHA
 334 /* Much the same sort of comment as for TEST_ENG_OPENSSL_RC4 */
 335 # include <openssl/sha.h>
 336 static const int test_digest_nids[] = { NID_sha1 };
 337
 338 static const int test_digest_nids_number = 1;
 339 static int test_sha1_init(EVP_MD_CTX *ctx)
 340 {
 341 # ifdef TEST_ENG_OPENSSL_SHA_P_INIT
 342     fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_init() called\n");
 343 # endif
 344     return SHA1_Init(ctx->md_data);
 345 }
 346
 347 static int test_sha1_update(EVP_MD_CTX *ctx, const void *data, size_t count)
 348 {
 349 # ifdef TEST_ENG_OPENSSL_SHA_P_UPDATE
 350     fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_update() called\n");
 351 # endif
 352     return SHA1_Update(ctx->md_data, data, count);
 353 }
 354
 355 static int test_sha1_final(EVP_MD_CTX *ctx, unsigned char *md)
 356 {
 357 # ifdef TEST_ENG_OPENSSL_SHA_P_FINAL
 358     fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) test_sha1_final() called\n");
 359 # endif
 360     return SHA1_Final(md, ctx->md_data);
 361 }
 362
 363 static const EVP_MD test_sha_md = {
 364     NID_sha1,
 365     NID_sha1WithRSAEncryption,
 366     SHA_DIGEST_LENGTH,
 367     0,
 368     test_sha1_init,
 369     test_sha1_update,
 370     test_sha1_final,
 371     NULL,
 372     NULL,
 373     EVP_PKEY_RSA_method,
 374     SHA_CBLOCK,
 375     sizeof(EVP_MD *) + sizeof(SHA_CTX),
 376 };
 377
 378 static int openssl_digests(ENGINE *e, const EVP_MD **digest,
 379                            const int **nids, int nid)
 380 {
 381     if (!digest) {
 382         /* We are returning a list of supported nids */
 383         *nids = test_digest_nids;
 384         return test_digest_nids_number;
 385     }
 386     /* We are being asked for a specific digest */
 387     if (nid == NID_sha1)
 388         *digest = &test_sha_md;
 389     else {
 390 # ifdef TEST_ENG_OPENSSL_SHA_OTHERS
 391         fprintf(stderr, "(TEST_ENG_OPENSSL_SHA) returning NULL for "
 392                 "nid %d\n", nid);
 393 # endif
 394         *digest = NULL;
 395         return 0;
 396     }
 397     return 1;
 398 }
 399 #endif
 400
 401 #ifdef TEST_ENG_OPENSSL_PKEY
 402 static EVP_PKEY *openssl_load_privkey(ENGINE *eng, const char *key_id,
 403                                       UI_METHOD *ui_method,
 404                                       void *callback_data)
 405 {
 406     BIO *in;
 407     EVP_PKEY *key;
 408     fprintf(stderr, "(TEST_ENG_OPENSSL_PKEY)Loading Private key %s\n",
 409             key_id);
 410     in = BIO_new_file(key_id, "r");
 411     if (!in)
 412         return NULL;
 413     key = PEM_read_bio_PrivateKey(in, NULL, 0, NULL);
 414     BIO_free(in);
 415     return key;
 416 }
 417 #endif
 418
 419 #ifdef TEST_ENG_OPENSSL_HMAC
 420
 421 /*
 422  * Experimental HMAC redirection implementation: mainly copied from
 423  * hm_pmeth.c
 424  */
 425
 426 /* HMAC pkey context structure */
 427
 428 typedef struct {
 429     const EVP_MD *md;           /* MD for HMAC use */
 430     ASN1_OCTET_STRING ktmp;     /* Temp storage for key */
 431     HMAC_CTX ctx;
 432 } OSSL_HMAC_PKEY_CTX;
 433
 434 static int ossl_hmac_init(EVP_PKEY_CTX *ctx)
 435 {
 436     OSSL_HMAC_PKEY_CTX *hctx;
 437     hctx = OPENSSL_malloc(sizeof(OSSL_HMAC_PKEY_CTX));
 438     if (!hctx)
 439         return 0;
 440     hctx->md = NULL;
 441     hctx->ktmp.data = NULL;
 442     hctx->ktmp.length = 0;
 443     hctx->ktmp.flags = 0;
 444     hctx->ktmp.type = V_ASN1_OCTET_STRING;
 445     HMAC_CTX_init(&hctx->ctx);
 446     EVP_PKEY_CTX_set_data(ctx, hctx);
 447     EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
 448 # ifdef TEST_ENG_OPENSSL_HMAC_INIT
 449     fprintf(stderr, "(TEST_ENG_OPENSSL_HMAC) ossl_hmac_init() called\n");
 450 # endif
 451     return 1;
 452 }
 453
 454 static int ossl_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 455 {
 456     OSSL_HMAC_PKEY_CTX *sctx, *dctx;
 457     if (!ossl_hmac_init(dst))
 458         return 0;
 459     sctx = EVP_PKEY_CTX_get_data(src);
 460     dctx = EVP_PKEY_CTX_get_data(dst);
 461     dctx->md = sctx->md;
 462     HMAC_CTX_init(&dctx->ctx);
 463     if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
 464         return 0;
 465     if (sctx->ktmp.data) {
 466         if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
 467                                    sctx->ktmp.data, sctx->ktmp.length))
 468             return 0;
 469     }
 470     return 1;
 471 }
 472
 473 static void ossl_hmac_cleanup(EVP_PKEY_CTX *ctx)
 474 {
 475     OSSL_HMAC_PKEY_CTX *hctx;
 476     hctx = EVP_PKEY_CTX_get_data(ctx);
 477     HMAC_CTX_cleanup(&hctx->ctx);
 478     if (hctx->ktmp.data) {
 479         if (hctx->ktmp.length)
 480             OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
 481         OPENSSL_free(hctx->ktmp.data);
 482         hctx->ktmp.data = NULL;
 483     }
 484     OPENSSL_free(hctx);
 485 }
 486
 487 static int ossl_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 488 {
 489     ASN1_OCTET_STRING *hkey = NULL;
 490     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
 491     if (!hctx->ktmp.data)
 492         return 0;
 493     hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
 494     if (!hkey)
 495         return 0;
 496     EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
 497
 498     return 1;
 499 }
 500
 501 static int ossl_int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
 502 {
 503     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx->pctx);
 504     if (!HMAC_Update(&hctx->ctx, data, count))
 505         return 0;
 506     return 1;
 507 }
 508
 509 static int ossl_hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
 510 {
 511     EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
 512     mctx->update = ossl_int_update;
 513     return 1;
 514 }
 515
 516 static int ossl_hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig,
 517                              size_t *siglen, EVP_MD_CTX *mctx)
 518 {
 519     unsigned int hlen;
 520     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
 521     int l = EVP_MD_CTX_size(mctx);
 522
 523     if (l < 0)
 524         return 0;
 525     *siglen = l;
 526     if (!sig)
 527         return 1;
 528
 529     if (!HMAC_Final(&hctx->ctx, sig, &hlen))
 530         return 0;
 531     *siglen = (size_t)hlen;
 532     return 1;
 533 }
 534
 535 static int ossl_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 536 {
 537     OSSL_HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
 538     EVP_PKEY *pk;
 539     ASN1_OCTET_STRING *key;
 540     switch (type) {
 541
 542     case EVP_PKEY_CTRL_SET_MAC_KEY:
 543         if ((!p2 && p1 > 0) || (p1 < -1))
 544             return 0;
 545         if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
 546             return 0;
 547         break;
 548
 549     case EVP_PKEY_CTRL_MD:
 550         hctx->md = p2;
 551         break;
 552
 553     case EVP_PKEY_CTRL_DIGESTINIT:
 554         pk = EVP_PKEY_CTX_get0_pkey(ctx);
 555         key = EVP_PKEY_get0(pk);
 556         if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md, NULL))
 557             return 0;
 558         break;
 559
 560     default:
 561         return -2;
 562
 563     }
 564     return 1;
 565 }
 566
 567 static int ossl_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
 568                               const char *type, const char *value)
 569 {
 570     if (!value) {
 571         return 0;
 572     }
 573     if (!strcmp(type, "key")) {
 574         void *p = (void *)value;
 575         return ossl_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
 576     }
 577     if (!strcmp(type, "hexkey")) {
 578         unsigned char *key;
 579         int r;
 580         long keylen;
 581         key = string_to_hex(value, &keylen);
 582         if (!key)
 583             return 0;
 584         r = ossl_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
 585         OPENSSL_free(key);
 586         return r;
 587     }
 588     return -2;
 589 }
 590
 591 static EVP_PKEY_METHOD *ossl_hmac_meth;
 592
 593 static int ossl_register_hmac_meth(void)
 594 {
 595     EVP_PKEY_METHOD *meth;
 596     meth = EVP_PKEY_meth_new(EVP_PKEY_HMAC, 0);
 597     if (!meth)
 598         return 0;
 599     EVP_PKEY_meth_set_init(meth, ossl_hmac_init);
 600     EVP_PKEY_meth_set_copy(meth, ossl_hmac_copy);
 601     EVP_PKEY_meth_set_cleanup(meth, ossl_hmac_cleanup);
 602
 603     EVP_PKEY_meth_set_keygen(meth, 0, ossl_hmac_keygen);
 604
 605     EVP_PKEY_meth_set_signctx(meth, ossl_hmac_signctx_init,
 606                               ossl_hmac_signctx);
 607
 608     EVP_PKEY_meth_set_ctrl(meth, ossl_hmac_ctrl, ossl_hmac_ctrl_str);
 609     ossl_hmac_meth = meth;
 610     return 1;
 611 }
 612
 613 static int ossl_pkey_meths(ENGINE *e, EVP_PKEY_METHOD **pmeth,
 614                            const int **nids, int nid)
 615 {
 616     static int ossl_pkey_nids[] = {
 617         EVP_PKEY_HMAC,
 618         0
 619     };
 620     if (!pmeth) {
 621         *nids = ossl_pkey_nids;
 622         return 1;
 623     }
 624
 625     if (nid == EVP_PKEY_HMAC) {
 626         *pmeth = ossl_hmac_meth;
 627         return 1;
 628     }
 629
 630     *pmeth = NULL;
 631     return 0;
 632 }
 633
 634 #endif