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