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     if (surewarehk_dso)
 564         DSO_free(surewarehk_dso);
 565     surewarehk_dso = NULL;
 566     p_surewarehk_Init = NULL;
 567     p_surewarehk_Finish = NULL;
 568     p_surewarehk_Rand_Bytes = NULL;
 569     p_surewarehk_Rand_Seed = NULL;
 570     p_surewarehk_Load_Privkey = NULL;
 571     p_surewarehk_Load_Rsa_Pubkey = NULL;
 572     p_surewarehk_Free = NULL;
 573     p_surewarehk_Rsa_Priv_Dec = NULL;
 574     p_surewarehk_Rsa_Sign = NULL;
 575     p_surewarehk_Dsa_Sign = NULL;
 576     p_surewarehk_Info_Pubkey = NULL;
 577     p_surewarehk_Load_Dsa_Pubkey = NULL;
 578     p_surewarehk_Mod_Exp = NULL;
 579     return 0;
 580 }
 581
 582 static int surewarehk_finish(ENGINE *e)
 583 {
 584     int to_return = 1;
 585     if (surewarehk_dso == NULL) {
 586         SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH, ENGINE_R_NOT_LOADED);
 587         to_return = 0;
 588         goto err;
 589     }
 590     p_surewarehk_Finish();
 591     if (!DSO_free(surewarehk_dso)) {
 592         SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH, ENGINE_R_DSO_FAILURE);
 593         to_return = 0;
 594         goto err;
 595     }
 596  err:
 597     BIO_free(logstream);
 598     surewarehk_dso = NULL;
 599     p_surewarehk_Init = NULL;
 600     p_surewarehk_Finish = NULL;
 601     p_surewarehk_Rand_Bytes = NULL;
 602     p_surewarehk_Rand_Seed = NULL;
 603     p_surewarehk_Load_Privkey = NULL;
 604     p_surewarehk_Load_Rsa_Pubkey = NULL;
 605     p_surewarehk_Free = NULL;
 606     p_surewarehk_Rsa_Priv_Dec = NULL;
 607     p_surewarehk_Rsa_Sign = NULL;
 608     p_surewarehk_Dsa_Sign = NULL;
 609     p_surewarehk_Info_Pubkey = NULL;
 610     p_surewarehk_Load_Dsa_Pubkey = NULL;
 611     p_surewarehk_Mod_Exp = NULL;
 612     return to_return;
 613 }
 614
 615 static void surewarehk_error_handling(char *const msg, int func, int ret)
 616 {
 617     switch (ret) {
 618     case SUREWAREHOOK_ERROR_UNIT_FAILURE:
 619         ENGINEerr(func, SUREWARE_R_UNIT_FAILURE);
 620         break;
 621     case SUREWAREHOOK_ERROR_FALLBACK:
 622         ENGINEerr(func, SUREWARE_R_REQUEST_FALLBACK);
 623         break;
 624     case SUREWAREHOOK_ERROR_DATA_SIZE:
 625         ENGINEerr(func, SUREWARE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
 626         break;
 627     case SUREWAREHOOK_ERROR_INVALID_PAD:
 628         ENGINEerr(func, SUREWARE_R_PADDING_CHECK_FAILED);
 629         break;
 630     default:
 631         ENGINEerr(func, SUREWARE_R_REQUEST_FAILED);
 632         break;
 633     case 1:                    /* nothing */
 634         msg[0] = '\0';
 635     }
 636     if (*msg) {
 637         ERR_add_error_data(1, msg);
 638         if (logstream) {
 639             CRYPTO_w_lock(CRYPTO_LOCK_BIO);
 640             BIO_write(logstream, msg, strlen(msg));
 641             CRYPTO_w_unlock(CRYPTO_LOCK_BIO);
 642         }
 643     }
 644 }
 645
 646 static int surewarehk_rand_bytes(unsigned char *buf, int num)
 647 {
 648     int ret = 0;
 649     char msg[64] = "ENGINE_rand_bytes";
 650     if (!p_surewarehk_Rand_Bytes) {
 651         SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_BYTES,
 652                     ENGINE_R_NOT_INITIALISED);
 653     } else {
 654         ret = p_surewarehk_Rand_Bytes(msg, buf, num);
 655         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RAND_BYTES, ret);
 656     }
 657     return ret == 1 ? 1 : 0;
 658 }
 659
 660 static int surewarehk_rand_seed(const void *buf, int num)
 661 {
 662     int ret = 0;
 663     char msg[64] = "ENGINE_rand_seed";
 664     if (!p_surewarehk_Rand_Seed) {
 665         SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_SEED,
 666                     ENGINE_R_NOT_INITIALISED);
 667         return 0;
 668     } else {
 669         ret = p_surewarehk_Rand_Seed(msg, buf, num);
 670         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RAND_SEED, ret);
 671         if (ret == 1)
 672             return 1;
 673         else
 674             return 0;
 675     }
 676 }
 677
 678 static int surewarehk_rand_add(const void *buf, int num, double entropy)
 679 {
 680     return surewarehk_rand_seed(buf, num);
 681 }
 682
 683 static EVP_PKEY *sureware_load_public(ENGINE *e, const char *key_id,
 684                                       char *hptr, unsigned long el,
 685                                       char keytype)
 686 {
 687     EVP_PKEY *res = NULL;
 688 #  ifndef OPENSSL_NO_RSA
 689     RSA *rsatmp = NULL;
 690 #  endif
 691 #  ifndef OPENSSL_NO_DSA
 692     DSA *dsatmp = NULL;
 693 #  endif
 694     char msg[64] = "sureware_load_public";
 695     int ret = 0;
 696     if (!p_surewarehk_Load_Rsa_Pubkey || !p_surewarehk_Load_Dsa_Pubkey) {
 697         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,
 698                     ENGINE_R_NOT_INITIALISED);
 699         goto err;
 700     }
 701     switch (keytype) {
 702 #  ifndef OPENSSL_NO_RSA
 703     case 1:
 704          /*RSA*/
 705             /* set private external reference */
 706             rsatmp = RSA_new_method(e);
 707         RSA_set_ex_data(rsatmp, rsaHndidx, hptr);
 708         rsatmp->flags |= RSA_FLAG_EXT_PKEY;
 709
 710         /* set public big nums */
 711         rsatmp->e = BN_new();
 712         rsatmp->n = BN_new();
 713         if (!rsatmp->e || !rsatmp->n)
 714             goto err;
 715         bn_expand2(rsatmp->e, el / sizeof(BN_ULONG));
 716         bn_expand2(rsatmp->n, el / sizeof(BN_ULONG));
 717         if (rsatmp->e->dmax != (int)(el / sizeof(BN_ULONG)) ||
 718             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         if (!dsatmp->pub_key || !dsatmp->p || !dsatmp->q || !dsatmp->g)
 756             goto err;
 757         bn_expand2(dsatmp->pub_key, el / sizeof(BN_ULONG));
 758         bn_expand2(dsatmp->p, el / sizeof(BN_ULONG));
 759         bn_expand2(dsatmp->q, 20 / sizeof(BN_ULONG));
 760         bn_expand2(dsatmp->g, el / sizeof(BN_ULONG));
 761         if (dsatmp->pub_key->dmax != (int)(el / sizeof(BN_ULONG))
 762             || dsatmp->p->dmax != (int)(el / sizeof(BN_ULONG))
 763             || dsatmp->q->dmax != 20 / sizeof(BN_ULONG)
 764             || 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     RSA_free(rsatmp);
 805 #  endif
 806 #  ifndef OPENSSL_NO_DSA
 807     DSA_free(dsatmp);
 808 #  endif
 809     return NULL;
 810 }
 811
 812 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
 813                                          UI_METHOD *ui_method,
 814                                          void *callback_data)
 815 {
 816     EVP_PKEY *res = NULL;
 817     int ret = 0;
 818     unsigned long el = 0;
 819     char *hptr = NULL;
 820     char keytype = 0;
 821     char msg[64] = "ENGINE_load_privkey";
 822
 823     if (!p_surewarehk_Load_Privkey) {
 824         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,
 825                     ENGINE_R_NOT_INITIALISED);
 826     } else {
 827         ret = p_surewarehk_Load_Privkey(msg, key_id, &hptr, &el, &keytype);
 828         if (ret != 1) {
 829             SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,
 830                         ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 831             ERR_add_error_data(1, msg);
 832         } else
 833             res = sureware_load_public(e, key_id, hptr, el, keytype);
 834     }
 835     return res;
 836 }
 837
 838 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
 839                                         UI_METHOD *ui_method,
 840                                         void *callback_data)
 841 {
 842     EVP_PKEY *res = NULL;
 843     int ret = 0;
 844     unsigned long el = 0;
 845     char *hptr = NULL;
 846     char keytype = 0;
 847     char msg[64] = "ENGINE_load_pubkey";
 848
 849     if (!p_surewarehk_Info_Pubkey) {
 850         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,
 851                     ENGINE_R_NOT_INITIALISED);
 852     } else {
 853         /* call once to identify if DSA or RSA */
 854         ret = p_surewarehk_Info_Pubkey(msg, key_id, &el, &keytype);
 855         if (ret != 1) {
 856             SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,
 857                         ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 858             ERR_add_error_data(1, msg);
 859         } else
 860             res = sureware_load_public(e, key_id, hptr, el, keytype);
 861     }
 862     return res;
 863 }
 864
 865 /*
 866  * This cleans up an RSA/DSA KM key(do not destroy the key into the hardware)
 867  * , called when ex_data is freed
 868  */
 869 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 870                                int idx, long argl, void *argp)
 871 {
 872     if (!p_surewarehk_Free) {
 873         SUREWAREerr(SUREWARE_F_SUREWAREHK_EX_FREE, ENGINE_R_NOT_INITIALISED);
 874     } else
 875         p_surewarehk_Free((char *)item, 0);
 876 }
 877
 878 /*
 879  * return number of decrypted bytes
 880  */
 881 #  ifndef OPENSSL_NO_RSA
 882 static int surewarehk_rsa_priv_dec(int flen, const unsigned char *from,
 883                                    unsigned char *to, RSA *rsa, int padding)
 884 {
 885     int ret = 0, tlen;
 886     char *buf = NULL, *hptr = NULL;
 887     char msg[64] = "ENGINE_rsa_priv_dec";
 888     if (!p_surewarehk_Rsa_Priv_Dec) {
 889         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 890                     ENGINE_R_NOT_INITIALISED);
 891     }
 892     /* extract ref to private key */
 893     else if (!(hptr = RSA_get_ex_data(rsa, rsaHndidx))) {
 894         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 895                     SUREWARE_R_MISSING_KEY_COMPONENTS);
 896         goto err;
 897     }
 898     /* analyse what padding we can do into the hardware */
 899     if (padding == RSA_PKCS1_PADDING) {
 900         /* do it one shot */
 901         ret =
 902             p_surewarehk_Rsa_Priv_Dec(msg, flen, (unsigned char *)from, &tlen,
 903                                       to, hptr, SUREWARE_PKCS1_PAD);
 904         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 905                                   ret);
 906         if (ret != 1)
 907             goto err;
 908         ret = tlen;
 909     } else {                    /* do with no padding into hardware */
 910
 911         ret =
 912             p_surewarehk_Rsa_Priv_Dec(msg, flen, (unsigned char *)from, &tlen,
 913                                       to, hptr, SUREWARE_NO_PAD);
 914         surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 915                                   ret);
 916         if (ret != 1)
 917             goto err;
 918         /* intermediate buffer for padding */
 919         if ((buf = OPENSSL_malloc(tlen)) == NULL) {
 920             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 921                         ERR_R_MALLOC_FAILURE);
 922             goto err;
 923         }
 924         memcpy(buf, to, tlen);  /* transfert to into buf */
 925         switch (padding) {      /* check padding in software */
 926         case RSA_PKCS1_OAEP_PADDING:
 927             ret =
 928                 RSA_padding_check_PKCS1_OAEP(to, tlen, (unsigned char *)buf,
 929                                              tlen, tlen, NULL, 0);
 930             break;
 931         case RSA_SSLV23_PADDING:
 932             ret =
 933                 RSA_padding_check_SSLv23(to, tlen, (unsigned char *)buf, flen,
 934                                          tlen);
 935             break;
 936         case RSA_NO_PADDING:
 937             ret =
 938                 RSA_padding_check_none(to, tlen, (unsigned char *)buf, flen,
 939                                        tlen);
 940             break;
 941         default:
 942             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 943                         SUREWARE_R_UNKNOWN_PADDING_TYPE);
 944             goto err;
 945         }
 946         if (ret < 0)
 947             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,
 948                         SUREWARE_R_PADDING_CHECK_FAILED);
 949     }
 950  err:
 951     if (buf) {
 952         OPENSSL_cleanse(buf, tlen);
 953         OPENSSL_free(buf);
 954     }
 955     return ret;
 956 }
 957
 958 /*
 959  * Does what OpenSSL rsa_priv_enc does.
 960  */
 961 static int surewarehk_rsa_sign(int flen, const unsigned char *from,
 962                                unsigned char *to, RSA *rsa, int padding)
 963 {
 964     int ret = 0, tlen;
 965     char *hptr = NULL;
 966     char msg[64] = "ENGINE_rsa_sign";
 967     if (!p_surewarehk_Rsa_Sign) {
 968         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN, ENGINE_R_NOT_INITIALISED);
 969     }
 970     /* extract ref to private key */
 971     else if (!(hptr = RSA_get_ex_data(rsa, rsaHndidx))) {
 972         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,
 973                     SUREWARE_R_MISSING_KEY_COMPONENTS);
 974     } else {
 975         switch (padding) {
 976         case RSA_PKCS1_PADDING: /* do it in one shot */
 977             ret =
 978                 p_surewarehk_Rsa_Sign(msg, flen, (unsigned char *)from, &tlen,
 979                                       to, hptr, SUREWARE_PKCS1_PAD);
 980             surewarehk_error_handling(msg, SUREWARE_F_SUREWAREHK_RSA_SIGN,
 981                                       ret);
 982             break;
 983         case RSA_NO_PADDING:
 984         default:
 985             SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,
 986                         SUREWARE_R_UNKNOWN_PADDING_TYPE);
 987         }
 988     }
 989     return ret == 1 ? tlen : ret;
 990 }
 991
 992 #  endif
 993
 994 #  ifndef OPENSSL_NO_DSA
 995 /* DSA sign and verify */
 996 static DSA_SIG *surewarehk_dsa_do_sign(const unsigned char *from, int flen,
 997                                        DSA *dsa)
 998 {
 999     int ret = 0;
1000     char *hptr = NULL;
1001     DSA_SIG *psign = NULL;
1002     char msg[64] = "ENGINE_dsa_do_sign";
1003     if (!p_surewarehk_Dsa_Sign) {
1004         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1005                     ENGINE_R_NOT_INITIALISED);
1006         goto err;
1007     }
1008     /* extract ref to private key */
1009     else if (!(hptr = DSA_get_ex_data(dsa, dsaHndidx))) {
1010         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1011                     SUREWARE_R_MISSING_KEY_COMPONENTS);
1012         goto err;
1013     } else {
1014         if ((psign = DSA_SIG_new()) == NULL) {
1015             SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,
1016                         ERR_R_MALLOC_FAILURE);
1017             goto err;
1018         }
1019         psign->r = BN_new();
1020         psign->s = BN_new();
1021         if (!psign->r || !psign->s)
1022             goto err;
1023         bn_expand2(psign->r, 20 / sizeof(BN_ULONG));
1024         bn_expand2(psign->s, 20 / sizeof(BN_ULONG));
1025         if (psign->r->dmax != 20 / sizeof(BN_ULONG) ||
1026             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 if (r) {
1056         bn_expand2(r, m->top);
1057         if (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 */