engines/e_sureware.c

   1 /*-
   2 *  Written by Corinne Dive-Reclus(cdive@baltimore.com)
   3 *
   4 *
   5 * Redistribution and use in source and binary forms, with or without
   6 * modification, are permitted provided that the following conditions
   7 * are met:
   8 *
   9 * 1. Redistributions of source code must retain the above copyright
  10 *    notice, this list of conditions and the following disclaimer.
  11 *
  12 * 2. Redistributions in binary form must reproduce the above copyright
  13 *    notice, this list of conditions and the following disclaimer in
  14 *    the documentation and/or other materials provided with the
  15 *    distribution.
  16 *
  17 * 3. All advertising materials mentioning features or use of this
  18 *    software must display the following acknowledgment:
  19 *    "This product includes software developed by the OpenSSL Project
  20 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  21 *
  22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23 *    endorse or promote products derived from this software without
  24 *    prior written permission. For written permission, please contact
  25 *    licensing@OpenSSL.org.
  26 *
  27 * 5. Products derived from this software may not be called "OpenSSL"
  28 *    nor may "OpenSSL" appear in their names without prior written
  29 *    permission of the OpenSSL Project.
  30 *
  31 * 6. Redistributions of any form whatsoever must retain the following
  32 *    acknowledgment:
  33 *    "This product includes software developed by the OpenSSL Project
  34 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  35 *
  36 * Written by Corinne Dive-Reclus(cdive@baltimore.com)
  37 *
  38 * Copyright@2001 Baltimore Technologies Ltd.
  39 * All right Reserved.
  40 *                                                                                      *
  41 *        THIS FILE IS PROVIDED BY BALTIMORE TECHNOLOGIES ``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 BALTIMORE TECHNOLOGIES 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
  54 #include <stdio.h>
  55 #include <string.h>
  56 #include <openssl/crypto.h>
  57 #include <openssl/pem.h>
  58 #include <openssl/dso.h>
  59 #include <openssl/engine.h>
  60 #include <openssl/rand.h>
  61 #ifndef OPENSSL_NO_RSA
  62 # include <openssl/rsa.h>
  63 #endif
  64 #ifndef OPENSSL_NO_DSA
  65 # include <openssl/dsa.h>
  66 #endif
  67 #ifndef OPENSSL_NO_DH
  68 # include <openssl/dh.h>
  69 #endif
  70 #include <openssl/bn.h>
  71
  72 #ifndef OPENSSL_NO_HW
  73 # ifndef OPENSSL_NO_HW_SUREWARE
  74
  75 #  ifdef FLAT_INC
  76 #   include "sureware.h"
  77 #  else
  78 #   include "vendor_defns/sureware.h"
  79 #  endif
  80
  81 #  define SUREWARE_LIB_NAME "sureware engine"
  82 #  include "e_sureware_err.c"
  83
  84 static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p,
  85                            void (*f) (void));
  86 static int surewarehk_destroy(ENGINE *e);
  87 static int surewarehk_init(ENGINE *e);
  88 static int surewarehk_finish(ENGINE *e);
  89 static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  90                              const BIGNUM *m, BN_CTX *ctx);
  91
  92 /* RSA stuff */
  93 #  ifndef OPENSSL_NO_RSA
  94 static int surewarehk_rsa_priv_dec(int flen, const unsigned char *from,
  95                                    unsigned char *to, RSA *rsa, int padding);
  96 static int surewarehk_rsa_sign(int flen, const unsigned char *from,
  97                                unsigned char *to, RSA *rsa, int padding);
  98 #  endif
  99
 100 /* RAND stuff */
 101 static int surewarehk_rand_bytes(unsigned char *buf, int num);
 102 static void surewarehk_rand_seed(const void *buf, int num);
 103 static void surewarehk_rand_add(const void *buf, int num, double entropy);
 104
 105 /* KM stuff */
 106 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
 107                                          UI_METHOD *ui_method,
 108                                          void *callback_data);
 109 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
 110                                         UI_METHOD *ui_method,
 111                                         void *callback_data);
 112 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 113                                int idx, long argl, void *argp);
 114 #  if 0
 115 static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 116                                   int idx, long argl, void *argp);
 117 #  endif
 118
 119 #  ifndef OPENSSL_NO_RSA
 120 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 121 static int surewarehk_mod_exp_mont(BIGNUM *r, const BIGNUM *a,
 122                                    const BIGNUM *p, const BIGNUM *m,
 123                                    BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 124 {
 125     return surewarehk_modexp(r, a, p, m, ctx);
 126 }
 127
 128 /* Our internal RSA_METHOD that we provide pointers to */
 129 static RSA_METHOD surewarehk_rsa = {
 130     "SureWare RSA method",
 131     NULL,                       /* pub_enc */
 132     NULL,                       /* pub_dec */
 133     surewarehk_rsa_sign,        /* our rsa_sign is OpenSSL priv_enc */
 134     surewarehk_rsa_priv_dec,    /* priv_dec */
 135     NULL,                       /* mod_exp */
 136     surewarehk_mod_exp_mont,    /* mod_exp_mongomery */
 137     NULL,                       /* init */
 138     NULL,                       /* finish */
 139     0,                          /* RSA flag */
 140     NULL,
 141     NULL,                       /* OpenSSL sign */
 142     NULL,                       /* OpenSSL verify */
 143     NULL                        /* keygen */
 144 };
 145 #  endif
 146
 147 #  ifndef OPENSSL_NO_DH
 148 /* Our internal DH_METHOD that we provide pointers to */
 149 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 150 static int surewarehk_modexp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
 151                                 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
 152                                 BN_MONT_CTX *m_ctx)
 153 {
 154     return surewarehk_modexp(r, a, p, m, ctx);
 155 }
 156
 157 static DH_METHOD surewarehk_dh = {
 158     "SureWare DH method",
 159     NULL,                       /* gen_key */
 160     NULL,                       /* agree, */
 161     surewarehk_modexp_dh,       /* dh mod exp */
 162     NULL,                       /* init */
 163     NULL,                       /* finish */
 164     0,                          /* flags */
 165     NULL,
 166     NULL
 167 };
 168 #  endif
 169
 170 static RAND_METHOD surewarehk_rand = {
 171     /* "SureWare RAND method", */
 172     surewarehk_rand_seed,
 173     surewarehk_rand_bytes,
 174     NULL,                       /* cleanup */
 175     surewarehk_rand_add,
 176     surewarehk_rand_bytes,
 177     NULL,                       /* rand_status */
 178 };
 179
 180 #  ifndef OPENSSL_NO_DSA
 181 /* DSA stuff */
 182 static DSA_SIG *surewarehk_dsa_do_sign(const unsigned char *dgst, int dlen,
 183                                        DSA *dsa);
 184 static int surewarehk_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
 185                                   BIGNUM *p1, BIGNUM *a2, BIGNUM *p2,
 186                                   BIGNUM *m, BN_CTX *ctx,
 187                                   BN_MONT_CTX *in_mont)
 188 {
 189     BIGNUM t;
 190     int to_return = 0;
 191     BN_init(&t);
 192     /* let rr = a1 ^ p1 mod m */
 193     if (!surewarehk_modexp(rr, a1, p1, m, ctx))
 194         goto end;
 195     /* let t = a2 ^ p2 mod m */
 196     if (!surewarehk_modexp(&t, a2, p2, m, ctx))
 197         goto end;
 198     /* let rr = rr * t mod m */
 199     if (!BN_mod_mul(rr, rr, &t, m, ctx))
 200         goto end;
 201     to_return = 1;
 202  end:
 203     BN_free(&t);
 204     return to_return;
 205 }
 206
 207 static DSA_METHOD surewarehk_dsa = {
 208     "SureWare DSA method",
 209     surewarehk_dsa_do_sign,
 210     NULL,                       /* sign setup */
 211     NULL,                       /* verify, */
 212     surewarehk_dsa_mod_exp,     /* mod exp */
 213     NULL,                       /* bn mod exp */
 214     NULL,                       /* init */
 215     NULL,                       /* finish */
 216     0,
 217     NULL,
 218     NULL,
 219     NULL
 220 };
 221 #  endif
 222
 223 static const char *engine_sureware_id = "sureware";
 224 static const char *engine_sureware_name = "SureWare hardware engine support";
 225
 226 /* Now, to our own code */
 227
 228 /*
 229  * As this is only ever called once, there's no need for locking (indeed -
 230  * the lock will already be held by our caller!!!)
 231  */
 232 static int bind_sureware(ENGINE *e)
 233 {
 234 #  ifndef OPENSSL_NO_RSA
 235     const RSA_METHOD *meth1;
 236 #  endif
 237 #  ifndef OPENSSL_NO_DSA
 238     const DSA_METHOD *meth2;
 239 #  endif
 240 #  ifndef OPENSSL_NO_DH
 241     const DH_METHOD *meth3;
 242 #  endif
 243
 244     if (!ENGINE_set_id(e, engine_sureware_id) ||
 245         !ENGINE_set_name(e, engine_sureware_name) ||
 246 #  ifndef OPENSSL_NO_RSA
 247         !ENGINE_set_RSA(e, &surewarehk_rsa) ||
 248 #  endif
 249 #  ifndef OPENSSL_NO_DSA
 250         !ENGINE_set_DSA(e, &surewarehk_dsa) ||
 251 #  endif
 252 #  ifndef OPENSSL_NO_DH
 253         !ENGINE_set_DH(e, &surewarehk_dh) ||
 254 #  endif
 255         !ENGINE_set_RAND(e, &surewarehk_rand) ||
 256         !ENGINE_set_destroy_function(e, surewarehk_destroy) ||
 257         !ENGINE_set_init_function(e, surewarehk_init) ||
 258         !ENGINE_set_finish_function(e, surewarehk_finish) ||
 259         !ENGINE_set_ctrl_function(e, surewarehk_ctrl) ||
 260         !ENGINE_set_load_privkey_function(e, surewarehk_load_privkey) ||
 261         !ENGINE_set_load_pubkey_function(e, surewarehk_load_pubkey))
 262         return 0;
 263
 264 #  ifndef OPENSSL_NO_RSA
 265     /*
 266      * We know that the "PKCS1_SSLeay()" functions hook properly to the
 267      * cswift-specific mod_exp and mod_exp_crt so we use those functions. NB:
 268      * We don't use ENGINE_openssl() or anything "more generic" because
 269      * something like the RSAref code may not hook properly, and if you own
 270      * one of these cards then you have the right to do RSA operations on it
 271      * anyway!
 272      */
 273     meth1 = RSA_PKCS1_SSLeay();
 274     if (meth1) {
 275         surewarehk_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 276         surewarehk_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 277     }
 278 #  endif
 279
 280 #  ifndef OPENSSL_NO_DSA
 281     /*
 282      * Use the DSA_OpenSSL() method and just hook the mod_exp-ish bits.
 283      */
 284     meth2 = DSA_OpenSSL();
 285     if (meth2) {
 286         surewarehk_dsa.dsa_do_verify = meth2->dsa_do_verify;
 287     }
 288 #  endif
 289
 290 #  ifndef OPENSSL_NO_DH
 291     /* Much the same for Diffie-Hellman */
 292     meth3 = DH_OpenSSL();
 293     if (meth3) {
 294         surewarehk_dh.generate_key = meth3->generate_key;
 295         surewarehk_dh.compute_key = meth3->compute_key;
 296     }
 297 #  endif
 298
 299     /* Ensure the sureware error handling is set up */
 300     ERR_load_SUREWARE_strings();
 301     return 1;
 302 }
 303
 304 #  ifndef OPENSSL_NO_DYNAMIC_ENGINE
 305 static int bind_helper(ENGINE *e, const char *id)
 306 {
 307     if (id && (strcmp(id, engine_sureware_id) != 0))
 308         return 0;
 309     if (!bind_sureware(e))
 310         return 0;
 311     return 1;
 312 }
 313
 314 IMPLEMENT_DYNAMIC_CHECK_FN()
 315     IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 316 #  else
 317 static ENGINE *engine_sureware(void)
 318 {
 319     ENGINE *ret = ENGINE_new();
 320     if (!ret)
 321         return NULL;
 322     if (!bind_sureware(ret)) {
 323         ENGINE_free(ret);
 324         return NULL;
 325     }
 326     return ret;
 327 }
 328
 329 void ENGINE_load_sureware(void)
 330 {
 331     /* Copied from eng_[openssl|dyn].c */
 332     ENGINE *toadd = engine_sureware();
 333     if (!toadd)
 334         return;
 335     ENGINE_add(toadd);
 336     ENGINE_free(toadd);
 337     ERR_clear_error();
 338 }
 339 #  endif
 340
 341 /*
 342  * This is a process-global DSO handle used for loading and unloading the
 343  * SureWareHook library. NB: This is only set (or unset) during an init() or
 344  * finish() call (reference counts permitting) and they're operating with
 345  * global locks, so this should be thread-safe implicitly.
 346  */
 347 static DSO *surewarehk_dso = NULL;
 348 #  ifndef OPENSSL_NO_RSA
 349 /* Index for KM handle.  Not really used yet. */
 350 static int rsaHndidx = -1;
 351 #  endif
 352 #  ifndef OPENSSL_NO_DSA
 353 /* Index for KM handle.  Not really used yet. */
 354 static int dsaHndidx = -1;
 355 #  endif
 356
 357 /*
 358  * These are the function pointers that are (un)set when the library has
 359  * successfully (un)loaded.
 360  */
 361 static SureWareHook_Init_t *p_surewarehk_Init = NULL;
 362 static SureWareHook_Finish_t *p_surewarehk_Finish = NULL;
 363 static SureWareHook_Rand_Bytes_t *p_surewarehk_Rand_Bytes = NULL;
 364 static SureWareHook_Rand_Seed_t *p_surewarehk_Rand_Seed = NULL;
 365 static SureWareHook_Load_Privkey_t *p_surewarehk_Load_Privkey = NULL;
 366 static SureWareHook_Info_Pubkey_t *p_surewarehk_Info_Pubkey = NULL;
 367 static SureWareHook_Load_Rsa_Pubkey_t *p_surewarehk_Load_Rsa_Pubkey = NULL;
 368 static SureWareHook_Load_Dsa_Pubkey_t *p_surewarehk_Load_Dsa_Pubkey = NULL;
 369 static SureWareHook_Free_t *p_surewarehk_Free = NULL;
 370 static SureWareHook_Rsa_Priv_Dec_t *p_surewarehk_Rsa_Priv_Dec = NULL;
 371 static SureWareHook_Rsa_Sign_t *p_surewarehk_Rsa_Sign = NULL;
 372 static SureWareHook_Dsa_Sign_t *p_surewarehk_Dsa_Sign = NULL;
 373 static SureWareHook_Mod_Exp_t *p_surewarehk_Mod_Exp = NULL;
 374
 375 /* Used in the DSO operations. */
 376 static const char *surewarehk_LIBNAME = "SureWareHook";
 377 static const char *n_surewarehk_Init = "SureWareHook_Init";
 378 static const char *n_surewarehk_Finish = "SureWareHook_Finish";
 379 static const char *n_surewarehk_Rand_Bytes = "SureWareHook_Rand_Bytes";
 380 static const char *n_surewarehk_Rand_Seed = "SureWareHook_Rand_Seed";
 381 static const char *n_surewarehk_Load_Privkey = "SureWareHook_Load_Privkey";
 382 static const char *n_surewarehk_Info_Pubkey = "SureWareHook_Info_Pubkey";
 383 static const char *n_surewarehk_Load_Rsa_Pubkey =
 384     "SureWareHook_Load_Rsa_Pubkey";
 385 static const char *n_surewarehk_Load_Dsa_Pubkey =
 386     "SureWareHook_Load_Dsa_Pubkey";
 387 static const char *n_surewarehk_Free = "SureWareHook_Free";
 388 static const char *n_surewarehk_Rsa_Priv_Dec = "SureWareHook_Rsa_Priv_Dec";
 389 static const char *n_surewarehk_Rsa_Sign = "SureWareHook_Rsa_Sign";
 390 static const char *n_surewarehk_Dsa_Sign = "SureWareHook_Dsa_Sign";
 391 static const char *n_surewarehk_Mod_Exp = "SureWareHook_Mod_Exp";
 392 static BIO *logstream = NULL;
 393
 394 /*
 395  * SureWareHook library functions and mechanics - these are used by the
 396  * higher-level functions further down. NB: As and where there's no error
 397  * checking, take a look lower down where these functions are called, the
 398  * checking and error handling is probably down there.
 399  */
 400 static int threadsafe = 1;
 401 static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p,
 402                            void (*f) (void))
 403 {
 404     int to_return = 1;
 405
 406     switch (cmd) {
 407     case ENGINE_CTRL_SET_LOGSTREAM:
 408         {
 409             BIO *bio = (BIO *)p;
 410             CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 411             if (logstream) {
 412                 BIO_free(logstream);
 413                 logstream = NULL;
 414             }
 415             if (CRYPTO_add(&bio->references, 1, CRYPTO_LOCK_BIO) > 1)
 416                 logstream = bio;
 417             else
 418                 SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,
 419                             SUREWARE_R_BIO_WAS_FREED);
 420         }
 421         CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 422         break;
 423         /*
 424          * This will prevent the initialisation function from "installing"
 425          * the mutex-handling callbacks, even if they are available from
 426          * within the library (or were provided to the library from the
 427          * calling application). This is to remove any baggage for
 428          * applications not using multithreading.
 429          */
 430     case ENGINE_CTRL_CHIL_NO_LOCKING:
 431         CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 432         threadsafe = 0;
 433         CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 434         break;
 435
 436         /* The command isn't understood by this engine */
 437     default:
 438         SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,
 439                     ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 440         to_return = 0;
 441         break;
 442     }
 443
 444     return to_return;
 445 }
 446
 447 /* Destructor (complements the "ENGINE_surewarehk()" constructor) */
 448 static int surewarehk_destroy(ENGINE *e)
 449 {
 450     ERR_unload_SUREWARE_strings();
 451     return 1;
 452 }
 453
 454 /* (de)initialisation functions. */
 455 static int surewarehk_init(ENGINE *e)
 456 {
 457     char msg[64] = "ENGINE_init";
 458     SureWareHook_Init_t *p1 = NULL;
 459     SureWareHook_Finish_t *p2 = NULL;
 460     SureWareHook_Rand_Bytes_t *p3 = NULL;
 461     SureWareHook_Rand_Seed_t *p4 = NULL;
 462     SureWareHook_Load_Privkey_t *p5 = NULL;
 463     SureWareHook_Load_Rsa_Pubkey_t *p6 = NULL;
 464     SureWareHook_Free_t *p7 = NULL;
 465     SureWareHook_Rsa_Priv_Dec_t *p8 = NULL;
 466     SureWareHook_Rsa_Sign_t *p9 = NULL;
 467     SureWareHook_Dsa_Sign_t *p12 = NULL;
 468     SureWareHook_Info_Pubkey_t *p13 = NULL;
 469     SureWareHook_Load_Dsa_Pubkey_t *p14 = NULL;
 470     SureWareHook_Mod_Exp_t *p15 = NULL;
 471
 472     if (surewarehk_dso != NULL) {
 473         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, ENGINE_R_ALREADY_LOADED);
 474         goto err;
 475     }
 476     /* Attempt to load libsurewarehk.so/surewarehk.dll/whatever. */
 477     surewarehk_dso = DSO_load(NULL, surewarehk_LIBNAME, NULL, 0);
 478     if (surewarehk_dso == NULL) {
 479         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, ENGINE_R_DSO_FAILURE);
 480         goto err;
 481     }
 482     if (!
 483         (p1 =
 484          (SureWareHook_Init_t *) DSO_bind_func(surewarehk_dso,
 485                                                n_surewarehk_Init))
 486 || !(p2 =
 487      (SureWareHook_Finish_t *) DSO_bind_func(surewarehk_dso,
 488                                              n_surewarehk_Finish))
 489 || !(p3 =
 490      (SureWareHook_Rand_Bytes_t *) DSO_bind_func(surewarehk_dso,
 491                                                  n_surewarehk_Rand_Bytes))
 492 || !(p4 =
 493      (SureWareHook_Rand_Seed_t *) DSO_bind_func(surewarehk_dso,
 494                                                 n_surewarehk_Rand_Seed))
 495 || !(p5 =
 496      (SureWareHook_Load_Privkey_t *) DSO_bind_func(surewarehk_dso,
 497                                                    n_surewarehk_Load_Privkey))
 498 || !(p6 =
 499      (SureWareHook_Load_Rsa_Pubkey_t *) DSO_bind_func(surewarehk_dso,
 500                                                       n_surewarehk_Load_Rsa_Pubkey))
 501 || !(p7 =
 502      (SureWareHook_Free_t *) DSO_bind_func(surewarehk_dso, n_surewarehk_Free))
 503 || !(p8 =
 504      (SureWareHook_Rsa_Priv_Dec_t *) DSO_bind_func(surewarehk_dso,
 505                                                    n_surewarehk_Rsa_Priv_Dec))
 506 || !(p9 =
 507      (SureWareHook_Rsa_Sign_t *) DSO_bind_func(surewarehk_dso,
 508                                                n_surewarehk_Rsa_Sign))
 509 || !(p12 =
 510      (SureWareHook_Dsa_Sign_t *) DSO_bind_func(surewarehk_dso,
 511                                                n_surewarehk_Dsa_Sign))
 512 || !(p13 =
 513      (SureWareHook_Info_Pubkey_t *) DSO_bind_func(surewarehk_dso,
 514                                                   n_surewarehk_Info_Pubkey))
 515 || !(p14 =
 516      (SureWareHook_Load_Dsa_Pubkey_t *) DSO_bind_func(surewarehk_dso,
 517                                                       n_surewarehk_Load_Dsa_Pubkey))
 518 || !(p15 =
 519      (SureWareHook_Mod_Exp_t *) DSO_bind_func(surewarehk_dso,
 520                                               n_surewarehk_Mod_Exp))) {
 521         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, ENGINE_R_DSO_FAILURE);
 522         goto err;
 523     }
 524     /* Copy the pointers */
 525     p_surewarehk_Init = p1;
 526     p_surewarehk_Finish = p2;
 527     p_surewarehk_Rand_Bytes = p3;
 528     p_surewarehk_Rand_Seed = p4;
 529     p_surewarehk_Load_Privkey = p5;
 530     p_surewarehk_Load_Rsa_Pubkey = p6;
 531     p_surewarehk_Free = p7;
 532     p_surewarehk_Rsa_Priv_Dec = p8;
 533     p_surewarehk_Rsa_Sign = p9;
 534     p_surewarehk_Dsa_Sign = p12;
 535     p_surewarehk_Info_Pubkey = p13;
 536     p_surewarehk_Load_Dsa_Pubkey = p14;
 537     p_surewarehk_Mod_Exp = p15;
 538     /* Contact the hardware and initialises it. */
 539     if (p_surewarehk_Init(msg, threadsafe) == SUREWAREHOOK_ERROR_UNIT_FAILURE) {
 540         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, SUREWARE_R_UNIT_FAILURE);
 541         goto err;
 542     }
 543     if (p_surewarehk_Init(msg, threadsafe) == SUREWAREHOOK_ERROR_UNIT_FAILURE) {
 544         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, SUREWARE_R_UNIT_FAILURE);
 545         goto err;
 546     }
 547     /*
 548      * try to load the default private key, if failed does not return a
 549      * failure but wait for an explicit ENGINE_load_privakey
 550      */
 551     surewarehk_load_privkey(e, NULL, NULL, NULL);
 552
 553     /* Everything's fine. */
 554 #  ifndef OPENSSL_NO_RSA
 555     if (rsaHndidx == -1)
 556         rsaHndidx = RSA_get_ex_new_index(0,
 557                                          "SureWareHook RSA key handle",
 558                                          NULL, NULL, surewarehk_ex_free);
 559 #  endif
 560 #  ifndef OPENSSL_NO_DSA
 561     if (dsaHndidx == -1)
 562         dsaHndidx = DSA_get_ex_new_index(0,
 563                                          "SureWareHook DSA key handle",
 564                                          NULL, NULL, surewarehk_ex_free);
 565 #  endif
 566
 567     return 1;
 568  err:
 569     if (surewarehk_dso)
 570         DSO_free(surewarehk_dso);
 571     surewarehk_dso = NULL;
 572     p_surewarehk_Init = NULL;
 573     p_surewarehk_Finish = NULL;
 574     p_surewarehk_Rand_Bytes = NULL;
 575     p_surewarehk_Rand_Seed = NULL;
 576     p_surewarehk_Load_Privkey = NULL;
 577     p_surewarehk_Load_Rsa_Pubkey = NULL;
 578     p_surewarehk_Free = NULL;
 579     p_surewarehk_Rsa_Priv_Dec = NULL;
 580     p_surewarehk_Rsa_Sign = NULL;
 581     p_surewarehk_Dsa_Sign = NULL;
 582     p_surewarehk_Info_Pubkey = NULL;
 583     p_surewarehk_Load_Dsa_Pubkey = NULL;
 584     p_surewarehk_Mod_Exp = NULL;
 585     return 0;
 586 }
 587
 588 static int surewarehk_finish(ENGINE *e)
 589 {
 590     int to_return = 1;
 591     if (surewarehk_dso == NULL) {
 592         SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH, ENGINE_R_NOT_LOADED);
 593         to_return = 0;
 594         goto err;
 595     }
 596     p_surewarehk_Finish();
 597     if (!DSO_free(surewarehk_dso)) {
 598         SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH, ENGINE_R_DSO_FAILURE);
 599         to_return = 0;
 600         goto err;
 601     }
 602  err:
 603     if (logstream)
 604         BIO_free(logstream);
 605     surewarehk_dso = NULL;
 606     p_surewarehk_Init = NULL;
 607     p_surewarehk_Finish = NULL;
 608     p_surewarehk_Rand_Bytes = NULL;
 609     p_surewarehk_Rand_Seed = NULL;
 610     p_surewarehk_Load_Privkey = NULL;
 611     p_surewarehk_Load_Rsa_Pubkey = NULL;
 612     p_surewarehk_Free = NULL;
 613     p_surewarehk_Rsa_Priv_Dec = NULL;
 614     p_surewarehk_Rsa_Sign = NULL;
 615     p_surewarehk_Dsa_Sign = NULL;
 616     p_surewarehk_Info_Pubkey = NULL;
 617     p_surewarehk_Load_Dsa_Pubkey = NULL;
 618     p_surewarehk_Mod_Exp = NULL;
 619     return to_return;
 620 }
 621
 622 static void surewarehk_error_handling(char *const msg, int func, int ret)
 623 {
 624     switch (ret) {
 625     case SUREWAREHOOK_ERROR_UNIT_FAILURE:
 626         ENGINEerr(func, SUREWARE_R_UNIT_FAILURE);
 627         break;
 628     case SUREWAREHOOK_ERROR_FALLBACK:
 629         ENGINEerr(func, SUREWARE_R_REQUEST_FALLBACK);
 630         break;
 631     case SUREWAREHOOK_ERROR_DATA_SIZE:
 632         ENGINEerr(func, SUREWARE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
 633         break;
 634     case SUREWAREHOOK_ERROR_INVALID_PAD:
 635         ENGINEerr(func, SUREWARE_R_PADDING_CHECK_FAILED);
 636         break;
 637     default:
 638         ENGINEerr(func, SUREWARE_R_REQUEST_FAILED);
 639         break;
 640     case 1:                    /* nothing */
 641         msg[0] = '\0';
 642     }
 643     if (*msg) {
 644         ERR_add_error_data(1, msg);
 645         if (logstream) {
 646             CRYPTO_w_lock(CRYPTO_LOCK_BIO);
 647             BIO_write(logstream, msg, strlen(msg));
 648             CRYPTO_w_unlock(CRYPTO_LOCK_BIO);
 649         }
 650     }
 651 }
 652
 653 static int surewarehk_rand_bytes(unsigned char *buf, int num)
 654 {
 655     int ret = 0;
 656     char msg[64] = "ENGINE_rand_bytes";
 657     if (!p_surewarehk_Rand_Bytes) {
 658         SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_BYTES,
 659                     ENGINE_R_NOT_INITIALISED);
 660     } else {
 661         ret = p_surewarehk_Rand_Bytes(msg, buf, num);
 662         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RAND_BYTES, ret);
 663     }
 664     return ret == 1 ? 1 : 0;
 665 }
 666
 667 static void surewarehk_rand_seed(const void *buf, int num)
 668 {
 669     int ret = 0;
 670     char msg[64] = "ENGINE_rand_seed";
 671     if (!p_surewarehk_Rand_Seed) {
 672         SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_SEED,
 673                     ENGINE_R_NOT_INITIALISED);
 674     } else {
 675         ret = p_surewarehk_Rand_Seed(msg, buf, num);
 676         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RAND_SEED, ret);
 677     }
 678 }
 679
 680 static void surewarehk_rand_add(const void *buf, int num, double entropy)
 681 {
 682     surewarehk_rand_seed(buf, num);
 683 }
 684
 685 static EVP_PKEY *sureware_load_public(ENGINE *e, const char *key_id,
 686                                       char *hptr, unsigned long el,
 687                                       char keytype)
 688 {
 689     EVP_PKEY *res = NULL;
 690 #  ifndef OPENSSL_NO_RSA
 691     RSA *rsatmp = NULL;
 692 #  endif
 693 #  ifndef OPENSSL_NO_DSA
 694     DSA *dsatmp = NULL;
 695 #  endif
 696     char msg[64] = "sureware_load_public";
 697     int ret = 0;
 698     if (!p_surewarehk_Load_Rsa_Pubkey || !p_surewarehk_Load_Dsa_Pubkey) {
 699         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,
 700                     ENGINE_R_NOT_INITIALISED);
 701         goto err;
 702     }
 703     switch (keytype) {
 704 #  ifndef OPENSSL_NO_RSA
 705     case 1:
 706          /*RSA*/
 707             /* set private external reference */
 708             rsatmp = RSA_new_method(e);
 709         RSA_set_ex_data(rsatmp, rsaHndidx, hptr);
 710         rsatmp->flags |= RSA_FLAG_EXT_PKEY;
 711
 712         /* set public big nums */
 713         rsatmp->e = BN_new();
 714         rsatmp->n = BN_new();
 715         bn_expand2(rsatmp->e, el / sizeof(BN_ULONG));
 716         bn_expand2(rsatmp->n, el / sizeof(BN_ULONG));
 717         if (!rsatmp->e || rsatmp->e->dmax != (int)(el / sizeof(BN_ULONG)) ||
 718             !rsatmp->n || rsatmp->n->dmax != (int)(el / sizeof(BN_ULONG)))
 719             goto err;
 720         ret = p_surewarehk_Load_Rsa_Pubkey(msg, key_id, el,
 721                                            (unsigned long *)rsatmp->n->d,
 722                                            (unsigned long *)rsatmp->e->d);
 723         surewarehk_error_handling(msg, SUREWARE_F_SUREWARE_LOAD_PUBLIC, ret);
 724         if (ret != 1) {
 725             SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,
 726                         ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 727             goto err;
 728         }
 729         /* normalise pub e and pub n */
 730         rsatmp->e->top = el / sizeof(BN_ULONG);
 731         bn_fix_top(rsatmp->e);
 732         rsatmp->n->top = el / sizeof(BN_ULONG);
 733         bn_fix_top(rsatmp->n);
 734         /* create an EVP object: engine + rsa key */
 735         res = EVP_PKEY_new();
 736         EVP_PKEY_assign_RSA(res, rsatmp);
 737         break;
 738 #  endif
 739
 740 #  ifndef OPENSSL_NO_DSA
 741     case 2:
 742          /*DSA*/
 743             /* set private/public external reference */
 744             dsatmp = DSA_new_method(e);
 745         DSA_set_ex_data(dsatmp, dsaHndidx, hptr);
 746         /*
 747          * dsatmp->flags |= DSA_FLAG_EXT_PKEY;
 748          */
 749
 750         /* set public key */
 751         dsatmp->pub_key = BN_new();
 752         dsatmp->p = BN_new();
 753         dsatmp->q = BN_new();
 754         dsatmp->g = BN_new();
 755         bn_expand2(dsatmp->pub_key, el / sizeof(BN_ULONG));
 756         bn_expand2(dsatmp->p, el / sizeof(BN_ULONG));
 757         bn_expand2(dsatmp->q, 20 / sizeof(BN_ULONG));
 758         bn_expand2(dsatmp->g, el / sizeof(BN_ULONG));
 759         if (!dsatmp->pub_key
 760             || dsatmp->pub_key->dmax != (int)(el / sizeof(BN_ULONG))
 761             || !dsatmp->p || dsatmp->p->dmax != (int)(el / sizeof(BN_ULONG))
 762             || !dsatmp->q || dsatmp->q->dmax != 20 / sizeof(BN_ULONG)
 763             || !dsatmp->g || dsatmp->g->dmax != (int)(el / sizeof(BN_ULONG)))
 764             goto err;
 765
 766         ret = p_surewarehk_Load_Dsa_Pubkey(msg, key_id, el,
 767                                            (unsigned long *)dsatmp->
 768                                            pub_key->d,
 769                                            (unsigned long *)dsatmp->p->d,
 770                                            (unsigned long *)dsatmp->q->d,
 771                                            (unsigned long *)dsatmp->g->d);
 772         surewarehk_error_handling(msg, SUREWARE_F_SUREWARE_LOAD_PUBLIC, ret);
 773         if (ret != 1) {
 774             SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,
 775                         ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 776             goto err;
 777         }
 778         /* set parameters */
 779         /* normalise pubkey and parameters in case of */
 780         dsatmp->pub_key->top = el / sizeof(BN_ULONG);
 781         bn_fix_top(dsatmp->pub_key);
 782         dsatmp->p->top = el / sizeof(BN_ULONG);
 783         bn_fix_top(dsatmp->p);
 784         dsatmp->q->top = 20 / sizeof(BN_ULONG);
 785         bn_fix_top(dsatmp->q);
 786         dsatmp->g->top = el / sizeof(BN_ULONG);
 787         bn_fix_top(dsatmp->g);
 788
 789         /* create an EVP object: engine + rsa key */
 790         res = EVP_PKEY_new();
 791         EVP_PKEY_assign_DSA(res, dsatmp);
 792         break;
 793 #  endif
 794
 795     default:
 796         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,
 797                     ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 798         goto err;
 799     }
 800     return res;
 801  err:
 802     if (res)
 803         EVP_PKEY_free(res);
 804 #  ifndef OPENSSL_NO_RSA
 805     if (rsatmp)
 806         RSA_free(rsatmp);
 807 #  endif
 808 #  ifndef OPENSSL_NO_DSA
 809     if (dsatmp)
 810         DSA_free(dsatmp);
 811 #  endif
 812     return NULL;
 813 }
 814
 815 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
 816                                          UI_METHOD *ui_method,
 817                                          void *callback_data)
 818 {
 819     EVP_PKEY *res = NULL;
 820     int ret = 0;
 821     unsigned long el = 0;
 822     char *hptr = NULL;
 823     char keytype = 0;
 824     char msg[64] = "ENGINE_load_privkey";
 825
 826     if (!p_surewarehk_Load_Privkey) {
 827         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,
 828                     ENGINE_R_NOT_INITIALISED);
 829     } else {
 830         ret = p_surewarehk_Load_Privkey(msg, key_id, &hptr, &el, &keytype);
 831         if (ret != 1) {
 832             SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,
 833                         ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 834             ERR_add_error_data(1, msg);
 835         } else
 836             res = sureware_load_public(e, key_id, hptr, el, keytype);
 837     }
 838     return res;
 839 }
 840
 841 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
 842                                         UI_METHOD *ui_method,
 843                                         void *callback_data)
 844 {
 845     EVP_PKEY *res = NULL;
 846     int ret = 0;
 847     unsigned long el = 0;
 848     char *hptr = NULL;
 849     char keytype = 0;
 850     char msg[64] = "ENGINE_load_pubkey";
 851
 852     if (!p_surewarehk_Info_Pubkey) {
 853         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,
 854                     ENGINE_R_NOT_INITIALISED);
 855     } else {
 856         /* call once to identify if DSA or RSA */
 857         ret = p_surewarehk_Info_Pubkey(msg, key_id, &el, &keytype);
 858         if (ret != 1) {
 859             SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,
 860                         ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 861             ERR_add_error_data(1, msg);
 862         } else
 863             res = sureware_load_public(e, key_id, hptr, el, keytype);
 864     }
 865     return res;
 866 }
 867
 868 /*
 869  * This cleans up an RSA/DSA KM key(do not destroy the key into the hardware)
 870  * , called when ex_data is freed
 871  */
 872 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 873                                int idx, long argl, void *argp)
 874 {
 875     if (!p_surewarehk_Free) {
 876         SUREWAREerr(SUREWARE_F_SUREWAREHK_EX_FREE, ENGINE_R_NOT_INITIALISED);
 877     } else
 878         p_surewarehk_Free((char *)item, 0);
 879 }
 880
 881 #  if 0
 882 /* not currently used (bug?) */
 883 /*
 884  * This cleans up an DH KM key (destroys the key into hardware), called when
 885  * ex_data is freed
 886  */
 887 static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 888                                   int idx, long argl, void *argp)
 889 {
 890     if (!p_surewarehk_Free) {
 891         SUREWAREerr(SUREWARE_F_SUREWAREHK_DH_EX_FREE,
 892                     ENGINE_R_NOT_INITIALISED);
 893     } else
 894         p_surewarehk_Free((char *)item, 1);
 895 }
 896 #  endif
 897
 898 /*
 899  * return number of decrypted bytes
 900  */
 901 #  ifndef OPENSSL_NO_RSA
 902 static int surewarehk_rsa_priv_dec(int flen, const unsigned char *from,
 903                                    unsigned char *to, RSA *rsa, int padding)
 904 {
 905     int ret = 0, tlen;
 906     char *buf = NULL, *hptr = NULL;
 907     char msg[64] = "ENGINE_rsa_priv_dec";
 908     if (!p_surewarehk_Rsa_Priv_Dec) {
 909         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 910                     ENGINE_R_NOT_INITIALISED);
 911     }
 912     /* extract ref to private key */
 913     else if (!(hptr = RSA_get_ex_data(rsa, rsaHndidx))) {
 914         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 915                     SUREWARE_R_MISSING_KEY_COMPONENTS);
 916         goto err;
 917     }
 918     /* analyse what padding we can do into the hardware */
 919     if (padding == RSA_PKCS1_PADDING) {
 920         /* do it one shot */
 921         ret =
 922             p_surewarehk_Rsa_Priv_Dec(msg, flen, (unsigned char *)from, &tlen,
 923                                       to, hptr, SUREWARE_PKCS1_PAD);
 924         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 925                                   ret);
 926         if (ret != 1)
 927             goto err;
 928         ret = tlen;
 929     } else {                    /* do with no padding into hardware */
 930
 931         ret =
 932             p_surewarehk_Rsa_Priv_Dec(msg, flen, (unsigned char *)from, &tlen,
 933                                       to, hptr, SUREWARE_NO_PAD);
 934         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 935                                   ret);
 936         if (ret != 1)
 937             goto err;
 938         /* intermediate buffer for padding */
 939         if ((buf = OPENSSL_malloc(tlen)) == NULL) {
 940             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 941                         ERR_R_MALLOC_FAILURE);
 942             goto err;
 943         }
 944         memcpy(buf, to, tlen);  /* transfert to into buf */
 945         switch (padding) {      /* check padding in software */
 946 #   ifndef OPENSSL_NO_SHA
 947         case RSA_PKCS1_OAEP_PADDING:
 948             ret =
 949                 RSA_padding_check_PKCS1_OAEP(to, tlen, (unsigned char *)buf,
 950                                              tlen, tlen, NULL, 0);
 951             break;
 952 #   endif
 953         case RSA_SSLV23_PADDING:
 954             ret =
 955                 RSA_padding_check_SSLv23(to, tlen, (unsigned char *)buf, flen,
 956                                          tlen);
 957             break;
 958         case RSA_NO_PADDING:
 959             ret =
 960                 RSA_padding_check_none(to, tlen, (unsigned char *)buf, flen,
 961                                        tlen);
 962             break;
 963         default:
 964             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 965                         SUREWARE_R_UNKNOWN_PADDING_TYPE);
 966             goto err;
 967         }
 968         if (ret < 0)
 969             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 970                         SUREWARE_R_PADDING_CHECK_FAILED);
 971     }
 972  err:
 973     if (buf) {
 974         OPENSSL_cleanse(buf, tlen);
 975         OPENSSL_free(buf);
 976     }
 977     return ret;
 978 }
 979
 980 /*
 981  * Does what OpenSSL rsa_priv_enc does.
 982  */
 983 static int surewarehk_rsa_sign(int flen, const unsigned char *from,
 984                                unsigned char *to, RSA *rsa, int padding)
 985 {
 986     int ret = 0, tlen;
 987     char *hptr = NULL;
 988     char msg[64] = "ENGINE_rsa_sign";
 989     if (!p_surewarehk_Rsa_Sign) {
 990         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN, ENGINE_R_NOT_INITIALISED);
 991     }
 992     /* extract ref to private key */
 993     else if (!(hptr = RSA_get_ex_data(rsa, rsaHndidx))) {
 994         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,
 995                     SUREWARE_R_MISSING_KEY_COMPONENTS);
 996     } else {
 997         switch (padding) {
 998         case RSA_PKCS1_PADDING: /* do it in one shot */
 999             ret =
1000                 p_surewarehk_Rsa_Sign(msg, flen, (unsigned char *)from, &tlen,
1001                                       to, hptr, SUREWARE_PKCS1_PAD);
1002             surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_SIGN,
1003                                       ret);
1004             break;
1005         case RSA_NO_PADDING:
1006         default:
1007             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,
1008                         SUREWARE_R_UNKNOWN_PADDING_TYPE);
1009         }
1010     }
1011     return ret == 1 ? tlen : ret;
1012 }
1013
1014 #  endif
1015
1016 #  ifndef OPENSSL_NO_DSA
1017 /* DSA sign and verify */
1018 static DSA_SIG *surewarehk_dsa_do_sign(const unsigned char *from, int flen,
1019                                        DSA *dsa)
1020 {
1021     int ret = 0;
1022     char *hptr = NULL;
1023     DSA_SIG *psign = NULL;
1024     char msg[64] = "ENGINE_dsa_do_sign";
1025     if (!p_surewarehk_Dsa_Sign) {
1026         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1027                     ENGINE_R_NOT_INITIALISED);
1028         goto err;
1029     }
1030     /* extract ref to private key */
1031     else if (!(hptr = DSA_get_ex_data(dsa, dsaHndidx))) {
1032         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1033                     SUREWARE_R_MISSING_KEY_COMPONENTS);
1034         goto err;
1035     } else {
1036         if ((psign = DSA_SIG_new()) == NULL) {
1037             SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1038                         ERR_R_MALLOC_FAILURE);
1039             goto err;
1040         }
1041         psign->r = BN_new();
1042         psign->s = BN_new();
1043         bn_expand2(psign->r, 20 / sizeof(BN_ULONG));
1044         bn_expand2(psign->s, 20 / sizeof(BN_ULONG));
1045         if (!psign->r || psign->r->dmax != 20 / sizeof(BN_ULONG) ||
1046             !psign->s || psign->s->dmax != 20 / sizeof(BN_ULONG))
1047             goto err;
1048         ret = p_surewarehk_Dsa_Sign(msg, flen, from,
1049                                     (unsigned long *)psign->r->d,
1050                                     (unsigned long *)psign->s->d, hptr);
1051         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1052                                   ret);
1053     }
1054     psign->r->top = 20 / sizeof(BN_ULONG);
1055     bn_fix_top(psign->r);
1056     psign->s->top = 20 / sizeof(BN_ULONG);
1057     bn_fix_top(psign->s);
1058
1059  err:
1060     if (psign) {
1061         DSA_SIG_free(psign);
1062         psign = NULL;
1063     }
1064     return psign;
1065 }
1066 #  endif
1067
1068 static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
1069                              const BIGNUM *m, BN_CTX *ctx)
1070 {
1071     int ret = 0;
1072     char msg[64] = "ENGINE_modexp";
1073     if (!p_surewarehk_Mod_Exp) {
1074         SUREWAREerr(SUREWARE_F_SUREWAREHK_MODEXP, ENGINE_R_NOT_INITIALISED);
1075     } else {
1076         bn_expand2(r, m->top);
1077         if (r && r->dmax == m->top) {
1078             /* do it */
1079             ret = p_surewarehk_Mod_Exp(msg,
1080                                        m->top * sizeof(BN_ULONG),
1081                                        (unsigned long *)m->d,
1082                                        p->top * sizeof(BN_ULONG),
1083                                        (unsigned long *)p->d,
1084                                        a->top * sizeof(BN_ULONG),
1085                                        (unsigned long *)a->d,
1086                                        (unsigned long *)r->d);
1087             surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_MODEXP, ret);
1088             if (ret == 1) {
1089                 /* normalise result */
1090                 r->top = m->top;
1091                 bn_fix_top(r);
1092             }
1093         }
1094     }
1095     return ret;
1096 }
1097 # endif                         /* !OPENSSL_NO_HW_SureWare */
1098 #endif                          /* !OPENSSL_NO_HW */