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             BIO_free(logstream);
 408             logstream = NULL;
 409             if (CRYPTO_add(&bio->references, 1, CRYPTO_LOCK_BIO) > 1)
 410                 logstream = bio;
 411             else
 412                 SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,
 413                             SUREWARE_R_BIO_WAS_FREED);
 414         }
 415         CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 416         break;
 417         /*
 418          * This will prevent the initialisation function from "installing"
 419          * the mutex-handling callbacks, even if they are available from
 420          * within the library (or were provided to the library from the
 421          * calling application). This is to remove any baggage for
 422          * applications not using multithreading.
 423          */
 424     case ENGINE_CTRL_CHIL_NO_LOCKING:
 425         CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 426         threadsafe = 0;
 427         CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 428         break;
 429
 430         /* The command isn't understood by this engine */
 431     default:
 432         SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,
 433                     ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 434         to_return = 0;
 435         break;
 436     }
 437
 438     return to_return;
 439 }
 440
 441 /* Destructor (complements the "ENGINE_surewarehk()" constructor) */
 442 static int surewarehk_destroy(ENGINE *e)
 443 {
 444     ERR_unload_SUREWARE_strings();
 445     return 1;
 446 }
 447
 448 /* (de)initialisation functions. */
 449 static int surewarehk_init(ENGINE *e)
 450 {
 451     char msg[64] = "ENGINE_init";
 452     SureWareHook_Init_t *p1 = NULL;
 453     SureWareHook_Finish_t *p2 = NULL;
 454     SureWareHook_Rand_Bytes_t *p3 = NULL;
 455     SureWareHook_Rand_Seed_t *p4 = NULL;
 456     SureWareHook_Load_Privkey_t *p5 = NULL;
 457     SureWareHook_Load_Rsa_Pubkey_t *p6 = NULL;
 458     SureWareHook_Free_t *p7 = NULL;
 459     SureWareHook_Rsa_Priv_Dec_t *p8 = NULL;
 460     SureWareHook_Rsa_Sign_t *p9 = NULL;
 461     SureWareHook_Dsa_Sign_t *p12 = NULL;
 462     SureWareHook_Info_Pubkey_t *p13 = NULL;
 463     SureWareHook_Load_Dsa_Pubkey_t *p14 = NULL;
 464     SureWareHook_Mod_Exp_t *p15 = NULL;
 465
 466     if (surewarehk_dso != NULL) {
 467         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, ENGINE_R_ALREADY_LOADED);
 468         goto err;
 469     }
 470     /* Attempt to load libsurewarehk.so/surewarehk.dll/whatever. */
 471     surewarehk_dso = DSO_load(NULL, surewarehk_LIBNAME, NULL, 0);
 472     if (surewarehk_dso == NULL) {
 473         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, ENGINE_R_DSO_FAILURE);
 474         goto err;
 475     }
 476     if (!
 477         (p1 =
 478          (SureWareHook_Init_t *) DSO_bind_func(surewarehk_dso,
 479                                                n_surewarehk_Init))
 480 || !(p2 =
 481      (SureWareHook_Finish_t *) DSO_bind_func(surewarehk_dso,
 482                                              n_surewarehk_Finish))
 483 || !(p3 =
 484      (SureWareHook_Rand_Bytes_t *) DSO_bind_func(surewarehk_dso,
 485                                                  n_surewarehk_Rand_Bytes))
 486 || !(p4 =
 487      (SureWareHook_Rand_Seed_t *) DSO_bind_func(surewarehk_dso,
 488                                                 n_surewarehk_Rand_Seed))
 489 || !(p5 =
 490      (SureWareHook_Load_Privkey_t *) DSO_bind_func(surewarehk_dso,
 491                                                    n_surewarehk_Load_Privkey))
 492 || !(p6 =
 493      (SureWareHook_Load_Rsa_Pubkey_t *) DSO_bind_func(surewarehk_dso,
 494                                                       n_surewarehk_Load_Rsa_Pubkey))
 495 || !(p7 =
 496      (SureWareHook_Free_t *) DSO_bind_func(surewarehk_dso, n_surewarehk_Free))
 497 || !(p8 =
 498      (SureWareHook_Rsa_Priv_Dec_t *) DSO_bind_func(surewarehk_dso,
 499                                                    n_surewarehk_Rsa_Priv_Dec))
 500 || !(p9 =
 501      (SureWareHook_Rsa_Sign_t *) DSO_bind_func(surewarehk_dso,
 502                                                n_surewarehk_Rsa_Sign))
 503 || !(p12 =
 504      (SureWareHook_Dsa_Sign_t *) DSO_bind_func(surewarehk_dso,
 505                                                n_surewarehk_Dsa_Sign))
 506 || !(p13 =
 507      (SureWareHook_Info_Pubkey_t *) DSO_bind_func(surewarehk_dso,
 508                                                   n_surewarehk_Info_Pubkey))
 509 || !(p14 =
 510      (SureWareHook_Load_Dsa_Pubkey_t *) DSO_bind_func(surewarehk_dso,
 511                                                       n_surewarehk_Load_Dsa_Pubkey))
 512 || !(p15 =
 513      (SureWareHook_Mod_Exp_t *) DSO_bind_func(surewarehk_dso,
 514                                               n_surewarehk_Mod_Exp))) {
 515         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, ENGINE_R_DSO_FAILURE);
 516         goto err;
 517     }
 518     /* Copy the pointers */
 519     p_surewarehk_Init = p1;
 520     p_surewarehk_Finish = p2;
 521     p_surewarehk_Rand_Bytes = p3;
 522     p_surewarehk_Rand_Seed = p4;
 523     p_surewarehk_Load_Privkey = p5;
 524     p_surewarehk_Load_Rsa_Pubkey = p6;
 525     p_surewarehk_Free = p7;
 526     p_surewarehk_Rsa_Priv_Dec = p8;
 527     p_surewarehk_Rsa_Sign = p9;
 528     p_surewarehk_Dsa_Sign = p12;
 529     p_surewarehk_Info_Pubkey = p13;
 530     p_surewarehk_Load_Dsa_Pubkey = p14;
 531     p_surewarehk_Mod_Exp = p15;
 532     /* Contact the hardware and initialises it. */
 533     if (p_surewarehk_Init(msg, threadsafe) == SUREWAREHOOK_ERROR_UNIT_FAILURE) {
 534         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, SUREWARE_R_UNIT_FAILURE);
 535         goto err;
 536     }
 537     if (p_surewarehk_Init(msg, threadsafe) == SUREWAREHOOK_ERROR_UNIT_FAILURE) {
 538         SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT, SUREWARE_R_UNIT_FAILURE);
 539         goto err;
 540     }
 541     /*
 542      * try to load the default private key, if failed does not return a
 543      * failure but wait for an explicit ENGINE_load_privakey
 544      */
 545     surewarehk_load_privkey(e, NULL, NULL, NULL);
 546
 547     /* Everything's fine. */
 548 #  ifndef OPENSSL_NO_RSA
 549     if (rsaHndidx == -1)
 550         rsaHndidx = RSA_get_ex_new_index(0,
 551                                          "SureWareHook RSA key handle",
 552                                          NULL, NULL, surewarehk_ex_free);
 553 #  endif
 554 #  ifndef OPENSSL_NO_DSA
 555     if (dsaHndidx == -1)
 556         dsaHndidx = DSA_get_ex_new_index(0,
 557                                          "SureWareHook DSA key handle",
 558                                          NULL, NULL, surewarehk_ex_free);
 559 #  endif
 560
 561     return 1;
 562  err:
 563     DSO_free(surewarehk_dso);
 564     surewarehk_dso = NULL;
 565     p_surewarehk_Init = NULL;
 566     p_surewarehk_Finish = NULL;
 567     p_surewarehk_Rand_Bytes = NULL;
 568     p_surewarehk_Rand_Seed = NULL;
 569     p_surewarehk_Load_Privkey = NULL;
 570     p_surewarehk_Load_Rsa_Pubkey = NULL;
 571     p_surewarehk_Free = NULL;
 572     p_surewarehk_Rsa_Priv_Dec = NULL;
 573     p_surewarehk_Rsa_Sign = NULL;
 574     p_surewarehk_Dsa_Sign = NULL;
 575     p_surewarehk_Info_Pubkey = NULL;
 576     p_surewarehk_Load_Dsa_Pubkey = NULL;
 577     p_surewarehk_Mod_Exp = NULL;
 578     return 0;
 579 }
 580
 581 static int surewarehk_finish(ENGINE *e)
 582 {
 583     int to_return = 1;
 584     if (surewarehk_dso == NULL) {
 585         SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH, ENGINE_R_NOT_LOADED);
 586         to_return = 0;
 587         goto err;
 588     }
 589     p_surewarehk_Finish();
 590     if (!DSO_free(surewarehk_dso)) {
 591         SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH, ENGINE_R_DSO_FAILURE);
 592         to_return = 0;
 593         goto err;
 594     }
 595  err:
 596     BIO_free(logstream);
 597     surewarehk_dso = NULL;
 598     p_surewarehk_Init = NULL;
 599     p_surewarehk_Finish = NULL;
 600     p_surewarehk_Rand_Bytes = NULL;
 601     p_surewarehk_Rand_Seed = NULL;
 602     p_surewarehk_Load_Privkey = NULL;
 603     p_surewarehk_Load_Rsa_Pubkey = NULL;
 604     p_surewarehk_Free = NULL;
 605     p_surewarehk_Rsa_Priv_Dec = NULL;
 606     p_surewarehk_Rsa_Sign = NULL;
 607     p_surewarehk_Dsa_Sign = NULL;
 608     p_surewarehk_Info_Pubkey = NULL;
 609     p_surewarehk_Load_Dsa_Pubkey = NULL;
 610     p_surewarehk_Mod_Exp = NULL;
 611     return to_return;
 612 }
 613
 614 static void surewarehk_error_handling(char *const msg, int func, int ret)
 615 {
 616     switch (ret) {
 617     case SUREWAREHOOK_ERROR_UNIT_FAILURE:
 618         ENGINEerr(func, SUREWARE_R_UNIT_FAILURE);
 619         break;
 620     case SUREWAREHOOK_ERROR_FALLBACK:
 621         ENGINEerr(func, SUREWARE_R_REQUEST_FALLBACK);
 622         break;
 623     case SUREWAREHOOK_ERROR_DATA_SIZE:
 624         ENGINEerr(func, SUREWARE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
 625         break;
 626     case SUREWAREHOOK_ERROR_INVALID_PAD:
 627         ENGINEerr(func, SUREWARE_R_PADDING_CHECK_FAILED);
 628         break;
 629     default:
 630         ENGINEerr(func, SUREWARE_R_REQUEST_FAILED);
 631         break;
 632     case 1:                    /* nothing */
 633         msg[0] = '\0';
 634     }
 635     if (*msg) {
 636         ERR_add_error_data(1, msg);
 637         if (logstream) {
 638             CRYPTO_w_lock(CRYPTO_LOCK_BIO);
 639             BIO_write(logstream, msg, strlen(msg));
 640             CRYPTO_w_unlock(CRYPTO_LOCK_BIO);
 641         }
 642     }
 643 }
 644
 645 static int surewarehk_rand_bytes(unsigned char *buf, int num)
 646 {
 647     int ret = 0;
 648     char msg[64] = "ENGINE_rand_bytes";
 649     if (!p_surewarehk_Rand_Bytes) {
 650         SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_BYTES,
 651                     ENGINE_R_NOT_INITIALISED);
 652     } else {
 653         ret = p_surewarehk_Rand_Bytes(msg, buf, num);
 654         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RAND_BYTES, ret);
 655     }
 656     return ret == 1 ? 1 : 0;
 657 }
 658
 659 static int surewarehk_rand_seed(const void *buf, int num)
 660 {
 661     int ret = 0;
 662     char msg[64] = "ENGINE_rand_seed";
 663     if (!p_surewarehk_Rand_Seed) {
 664         SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_SEED,
 665                     ENGINE_R_NOT_INITIALISED);
 666         return 0;
 667     } else {
 668         ret = p_surewarehk_Rand_Seed(msg, buf, num);
 669         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RAND_SEED, ret);
 670         if (ret == 1)
 671             return 1;
 672         else
 673             return 0;
 674     }
 675 }
 676
 677 static int surewarehk_rand_add(const void *buf, int num, double entropy)
 678 {
 679     return surewarehk_rand_seed(buf, num);
 680 }
 681
 682 static EVP_PKEY *sureware_load_public(ENGINE *e, const char *key_id,
 683                                       char *hptr, unsigned long el,
 684                                       char keytype)
 685 {
 686     EVP_PKEY *res = NULL;
 687 #  ifndef OPENSSL_NO_RSA
 688     RSA *rsatmp = NULL;
 689 #  endif
 690 #  ifndef OPENSSL_NO_DSA
 691     DSA *dsatmp = NULL;
 692 #  endif
 693     char msg[64] = "sureware_load_public";
 694     int ret = 0;
 695     if (!p_surewarehk_Load_Rsa_Pubkey || !p_surewarehk_Load_Dsa_Pubkey) {
 696         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,
 697                     ENGINE_R_NOT_INITIALISED);
 698         goto err;
 699     }
 700     switch (keytype) {
 701 #  ifndef OPENSSL_NO_RSA
 702     case 1:
 703          /*RSA*/
 704             /* set private external reference */
 705             rsatmp = RSA_new_method(e);
 706         RSA_set_ex_data(rsatmp, rsaHndidx, hptr);
 707         rsatmp->flags |= RSA_FLAG_EXT_PKEY;
 708
 709         /* set public big nums */
 710         rsatmp->e = BN_new();
 711         rsatmp->n = BN_new();
 712         if (!rsatmp->e || !rsatmp->n)
 713             goto err;
 714         bn_expand2(rsatmp->e, el / sizeof(BN_ULONG));
 715         bn_expand2(rsatmp->n, el / sizeof(BN_ULONG));
 716         if (rsatmp->e->dmax != (int)(el / sizeof(BN_ULONG)) ||
 717             rsatmp->n->dmax != (int)(el / sizeof(BN_ULONG)))
 718             goto err;
 719         ret = p_surewarehk_Load_Rsa_Pubkey(msg, key_id, el,
 720                                            (unsigned long *)rsatmp->n->d,
 721                                            (unsigned long *)rsatmp->e->d);
 722         surewarehk_error_handling(msg, SUREWARE_F_SUREWARE_LOAD_PUBLIC, ret);
 723         if (ret != 1) {
 724             SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,
 725                         ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 726             goto err;
 727         }
 728         /* normalise pub e and pub n */
 729         rsatmp->e->top = el / sizeof(BN_ULONG);
 730         bn_fix_top(rsatmp->e);
 731         rsatmp->n->top = el / sizeof(BN_ULONG);
 732         bn_fix_top(rsatmp->n);
 733         /* create an EVP object: engine + rsa key */
 734         res = EVP_PKEY_new();
 735         EVP_PKEY_assign_RSA(res, rsatmp);
 736         break;
 737 #  endif
 738
 739 #  ifndef OPENSSL_NO_DSA
 740     case 2:
 741          /*DSA*/
 742             /* set private/public external reference */
 743             dsatmp = DSA_new_method(e);
 744         DSA_set_ex_data(dsatmp, dsaHndidx, hptr);
 745         /*
 746          * dsatmp->flags |= DSA_FLAG_EXT_PKEY;
 747          */
 748
 749         /* set public key */
 750         dsatmp->pub_key = BN_new();
 751         dsatmp->p = BN_new();
 752         dsatmp->q = BN_new();
 753         dsatmp->g = BN_new();
 754         if (!dsatmp->pub_key || !dsatmp->p || !dsatmp->q || !dsatmp->g)
 755             goto err;
 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->dmax != (int)(el / sizeof(BN_ULONG))
 761             || dsatmp->p->dmax != (int)(el / sizeof(BN_ULONG))
 762             || dsatmp->q->dmax != 20 / sizeof(BN_ULONG)
 763             || 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 #  ifndef OPENSSL_NO_RSA
 803     RSA_free(rsatmp);
 804 #  endif
 805 #  ifndef OPENSSL_NO_DSA
 806     DSA_free(dsatmp);
 807 #  endif
 808     return NULL;
 809 }
 810
 811 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
 812                                          UI_METHOD *ui_method,
 813                                          void *callback_data)
 814 {
 815     EVP_PKEY *res = NULL;
 816     int ret = 0;
 817     unsigned long el = 0;
 818     char *hptr = NULL;
 819     char keytype = 0;
 820     char msg[64] = "ENGINE_load_privkey";
 821
 822     if (!p_surewarehk_Load_Privkey) {
 823         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,
 824                     ENGINE_R_NOT_INITIALISED);
 825     } else {
 826         ret = p_surewarehk_Load_Privkey(msg, key_id, &hptr, &el, &keytype);
 827         if (ret != 1) {
 828             SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,
 829                         ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 830             ERR_add_error_data(1, msg);
 831         } else
 832             res = sureware_load_public(e, key_id, hptr, el, keytype);
 833     }
 834     return res;
 835 }
 836
 837 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
 838                                         UI_METHOD *ui_method,
 839                                         void *callback_data)
 840 {
 841     EVP_PKEY *res = NULL;
 842     int ret = 0;
 843     unsigned long el = 0;
 844     char *hptr = NULL;
 845     char keytype = 0;
 846     char msg[64] = "ENGINE_load_pubkey";
 847
 848     if (!p_surewarehk_Info_Pubkey) {
 849         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,
 850                     ENGINE_R_NOT_INITIALISED);
 851     } else {
 852         /* call once to identify if DSA or RSA */
 853         ret = p_surewarehk_Info_Pubkey(msg, key_id, &el, &keytype);
 854         if (ret != 1) {
 855             SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,
 856                         ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 857             ERR_add_error_data(1, msg);
 858         } else
 859             res = sureware_load_public(e, key_id, hptr, el, keytype);
 860     }
 861     return res;
 862 }
 863
 864 /*
 865  * This cleans up an RSA/DSA KM key(do not destroy the key into the hardware)
 866  * , called when ex_data is freed
 867  */
 868 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 869                                int idx, long argl, void *argp)
 870 {
 871     if (!p_surewarehk_Free) {
 872         SUREWAREerr(SUREWARE_F_SUREWAREHK_EX_FREE, ENGINE_R_NOT_INITIALISED);
 873     } else
 874         p_surewarehk_Free((char *)item, 0);
 875 }
 876
 877 /*
 878  * return number of decrypted bytes
 879  */
 880 #  ifndef OPENSSL_NO_RSA
 881 static int surewarehk_rsa_priv_dec(int flen, const unsigned char *from,
 882                                    unsigned char *to, RSA *rsa, int padding)
 883 {
 884     int ret = 0, tlen;
 885     char *buf = NULL, *hptr = NULL;
 886     char msg[64] = "ENGINE_rsa_priv_dec";
 887     if (!p_surewarehk_Rsa_Priv_Dec) {
 888         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 889                     ENGINE_R_NOT_INITIALISED);
 890     }
 891     /* extract ref to private key */
 892     else if ((hptr = RSA_get_ex_data(rsa, rsaHndidx)) == NULL) {
 893         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 894                     SUREWARE_R_MISSING_KEY_COMPONENTS);
 895         goto err;
 896     }
 897     /* analyse what padding we can do into the hardware */
 898     if (padding == RSA_PKCS1_PADDING) {
 899         /* do it one shot */
 900         ret =
 901             p_surewarehk_Rsa_Priv_Dec(msg, flen, (unsigned char *)from, &tlen,
 902                                       to, hptr, SUREWARE_PKCS1_PAD);
 903         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 904                                   ret);
 905         if (ret != 1)
 906             goto err;
 907         ret = tlen;
 908     } else {                    /* do with no padding into hardware */
 909
 910         ret =
 911             p_surewarehk_Rsa_Priv_Dec(msg, flen, (unsigned char *)from, &tlen,
 912                                       to, hptr, SUREWARE_NO_PAD);
 913         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 914                                   ret);
 915         if (ret != 1)
 916             goto err;
 917         /* intermediate buffer for padding */
 918         if ((buf = OPENSSL_malloc(tlen)) == NULL) {
 919             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 920                         ERR_R_MALLOC_FAILURE);
 921             goto err;
 922         }
 923         memcpy(buf, to, tlen);  /* transfert to into buf */
 924         switch (padding) {      /* check padding in software */
 925         case RSA_PKCS1_OAEP_PADDING:
 926             ret =
 927                 RSA_padding_check_PKCS1_OAEP(to, tlen, (unsigned char *)buf,
 928                                              tlen, tlen, NULL, 0);
 929             break;
 930         case RSA_SSLV23_PADDING:
 931             ret =
 932                 RSA_padding_check_SSLv23(to, tlen, (unsigned char *)buf, flen,
 933                                          tlen);
 934             break;
 935         case RSA_NO_PADDING:
 936             ret =
 937                 RSA_padding_check_none(to, tlen, (unsigned char *)buf, flen,
 938                                        tlen);
 939             break;
 940         default:
 941             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 942                         SUREWARE_R_UNKNOWN_PADDING_TYPE);
 943             goto err;
 944         }
 945         if (ret < 0)
 946             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 947                         SUREWARE_R_PADDING_CHECK_FAILED);
 948     }
 949  err:
 950     OPENSSL_clear_free(buf, tlen);
 951     return ret;
 952 }
 953
 954 /*
 955  * Does what OpenSSL rsa_priv_enc does.
 956  */
 957 static int surewarehk_rsa_sign(int flen, const unsigned char *from,
 958                                unsigned char *to, RSA *rsa, int padding)
 959 {
 960     int ret = 0, tlen;
 961     char *hptr = NULL;
 962     char msg[64] = "ENGINE_rsa_sign";
 963     if (!p_surewarehk_Rsa_Sign) {
 964         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN, ENGINE_R_NOT_INITIALISED);
 965     }
 966     /* extract ref to private key */
 967     else if ((hptr = RSA_get_ex_data(rsa, rsaHndidx)) == NULL) {
 968         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,
 969                     SUREWARE_R_MISSING_KEY_COMPONENTS);
 970     } else {
 971         switch (padding) {
 972         case RSA_PKCS1_PADDING: /* do it in one shot */
 973             ret =
 974                 p_surewarehk_Rsa_Sign(msg, flen, (unsigned char *)from, &tlen,
 975                                       to, hptr, SUREWARE_PKCS1_PAD);
 976             surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_SIGN,
 977                                       ret);
 978             break;
 979         case RSA_NO_PADDING:
 980         default:
 981             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,
 982                         SUREWARE_R_UNKNOWN_PADDING_TYPE);
 983         }
 984     }
 985     return ret == 1 ? tlen : ret;
 986 }
 987
 988 #  endif
 989
 990 #  ifndef OPENSSL_NO_DSA
 991 /* DSA sign and verify */
 992 static DSA_SIG *surewarehk_dsa_do_sign(const unsigned char *from, int flen,
 993                                        DSA *dsa)
 994 {
 995     int ret = 0;
 996     char *hptr = NULL;
 997     DSA_SIG *psign = NULL;
 998     char msg[64] = "ENGINE_dsa_do_sign";
 999     if (!p_surewarehk_Dsa_Sign) {
1000         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1001                     ENGINE_R_NOT_INITIALISED);
1002         goto err;
1003     }
1004     /* extract ref to private key */
1005     else if ((hptr = DSA_get_ex_data(dsa, dsaHndidx)) == NULL) {
1006         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1007                     SUREWARE_R_MISSING_KEY_COMPONENTS);
1008         goto err;
1009     } else {
1010         if ((psign = DSA_SIG_new()) == NULL) {
1011             SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1012                         ERR_R_MALLOC_FAILURE);
1013             goto err;
1014         }
1015         psign->r = BN_new();
1016         psign->s = BN_new();
1017         if (!psign->r || !psign->s)
1018             goto err;
1019         bn_expand2(psign->r, 20 / sizeof(BN_ULONG));
1020         bn_expand2(psign->s, 20 / sizeof(BN_ULONG));
1021         if (psign->r->dmax != 20 / sizeof(BN_ULONG) ||
1022             psign->s->dmax != 20 / sizeof(BN_ULONG))
1023             goto err;
1024         ret = p_surewarehk_Dsa_Sign(msg, flen, from,
1025                                     (unsigned long *)psign->r->d,
1026                                     (unsigned long *)psign->s->d, hptr);
1027         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1028                                   ret);
1029     }
1030     psign->r->top = 20 / sizeof(BN_ULONG);
1031     bn_fix_top(psign->r);
1032     psign->s->top = 20 / sizeof(BN_ULONG);
1033     bn_fix_top(psign->s);
1034
1035  err:
1036     if (psign) {
1037         DSA_SIG_free(psign);
1038         psign = NULL;
1039     }
1040     return psign;
1041 }
1042 #  endif
1043
1044 static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
1045                              const BIGNUM *m, BN_CTX *ctx)
1046 {
1047     int ret = 0;
1048     char msg[64] = "ENGINE_modexp";
1049     if (!p_surewarehk_Mod_Exp) {
1050         SUREWAREerr(SUREWARE_F_SUREWAREHK_MODEXP, ENGINE_R_NOT_INITIALISED);
1051     } else if (r) {
1052         bn_expand2(r, m->top);
1053         if (r->dmax == m->top) {
1054             /* do it */
1055             ret = p_surewarehk_Mod_Exp(msg,
1056                                        m->top * sizeof(BN_ULONG),
1057                                        (unsigned long *)m->d,
1058                                        p->top * sizeof(BN_ULONG),
1059                                        (unsigned long *)p->d,
1060                                        a->top * sizeof(BN_ULONG),
1061                                        (unsigned long *)a->d,
1062                                        (unsigned long *)r->d);
1063             surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_MODEXP, ret);
1064             if (ret == 1) {
1065                 /* normalise result */
1066                 r->top = m->top;
1067                 bn_fix_top(r);
1068             }
1069         }
1070     }
1071     return ret;
1072 }
1073 # endif                         /* !OPENSSL_NO_HW_SUREWARE */
1074 #endif                          /* !OPENSSL_NO_HW */