engines/e_sureware.c

   1 /* Written by Corinne Dive-Reclus(cdive@baltimore.com)
   2 *
   3 *
   4 * Redistribution and use in source and binary forms, with or without
   5 * modification, are permitted provided that the following conditions
   6 * are met:
   7 *
   8 * 1. Redistributions of source code must retain the above copyright
   9 *    notice, this list of conditions and the following disclaimer.
  10 *
  11 * 2. Redistributions in binary form must reproduce the above copyright
  12 *    notice, this list of conditions and the following disclaimer in
  13 *    the documentation and/or other materials provided with the
  14 *    distribution.
  15 *
  16 * 3. All advertising materials mentioning features or use of this
  17 *    software must display the following acknowledgment:
  18 *    "This product includes software developed by the OpenSSL Project
  19 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20 *
  21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22 *    endorse or promote products derived from this software without
  23 *    prior written permission. For written permission, please contact
  24 *    licensing@OpenSSL.org.
  25 *
  26 * 5. Products derived from this software may not be called "OpenSSL"
  27 *    nor may "OpenSSL" appear in their names without prior written
  28 *    permission of the OpenSSL Project.
  29 *
  30 * 6. Redistributions of any form whatsoever must retain the following
  31 *    acknowledgment:
  32 *    "This product includes software developed by the OpenSSL Project
  33 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34 *
  35 * Written by Corinne Dive-Reclus(cdive@baltimore.com)
  36 *
  37 * Copyright@2001 Baltimore Technologies Ltd.
  38 * All right Reserved.
  39 *                                                                                                                                                                                               *
  40 *               THIS FILE IS PROVIDED BY BALTIMORE TECHNOLOGIES ``AS IS'' AND                                                                                                                                                   *
  41 *               ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE                                   *
  42 *               IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE                              *
  43 *               ARE DISCLAIMED.  IN NO EVENT SHALL BALTIMORE TECHNOLOGIES BE LIABLE                                             *
  44 *               FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL                              *
  45 *               DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS                                 *
  46 *               OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)                                   *
  47 *               HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT                              *
  48 *               LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY                               *
  49 *               OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF                                  *
  50 *               SUCH DAMAGE.                                                                                                                                                    *
  51 ====================================================================*/
  52
  53 #include <stdio.h>
  54 #include <string.h>
  55 #include <openssl/crypto.h>
  56 #include <openssl/pem.h>
  57 #include <openssl/dso.h>
  58 #include <openssl/engine.h>
  59 #include <openssl/rand.h>
  60 #include <openssl/rsa.h>
  61 #include <openssl/dsa.h>
  62 #include <openssl/dh.h>
  63 #include <openssl/bn.h>
  64
  65 #ifndef OPENSSL_NO_HW
  66 #ifndef OPENSSL_NO_HW_SUREWARE
  67
  68 #ifdef FLAT_INC
  69 #include "sureware.h"
  70 #else
  71 #include "vendor_defns/sureware.h"
  72 #endif
  73
  74 #define SUREWARE_LIB_NAME "sureware engine"
  75 #include "e_sureware_err.c"
  76
  77 static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
  78 static int surewarehk_destroy(ENGINE *e);
  79 static int surewarehk_init(ENGINE *e);
  80 static int surewarehk_finish(ENGINE *e);
  81 static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  82         const BIGNUM *m, BN_CTX *ctx);
  83
  84 /* RSA stuff */
  85 static int surewarehk_rsa_priv_dec(int flen,const unsigned char *from,unsigned char *to,
  86                         RSA *rsa,int padding);
  87 static int surewarehk_rsa_sign(int flen,const unsigned char *from,unsigned char *to,
  88                             RSA *rsa,int padding);
  89
  90 /* RAND stuff */
  91 static int surewarehk_rand_bytes(unsigned char *buf, int num);
  92 static void surewarehk_rand_seed(const void *buf, int num);
  93 static void surewarehk_rand_add(const void *buf, int num, double entropy);
  94
  95 /* KM stuff */
  96 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
  97         UI_METHOD *ui_method, void *callback_data);
  98 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
  99         UI_METHOD *ui_method, void *callback_data);
 100 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 101         int idx,long argl, void *argp);
 102 #if 0
 103 static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 104         int idx,long argl, void *argp);
 105 #endif
 106
 107 #ifndef OPENSSL_NO_RSA
 108 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 109 static int surewarehk_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 110                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 111 {
 112         return surewarehk_modexp(r, a, p, m, ctx);
 113 }
 114
 115 /* Our internal RSA_METHOD that we provide pointers to */
 116 static RSA_METHOD surewarehk_rsa =
 117         {
 118         "SureWare RSA method",
 119         NULL, /* pub_enc*/
 120         NULL, /* pub_dec*/
 121         surewarehk_rsa_sign, /* our rsa_sign is OpenSSL priv_enc*/
 122         surewarehk_rsa_priv_dec, /* priv_dec*/
 123         NULL, /*mod_exp*/
 124         surewarehk_mod_exp_mont, /*mod_exp_mongomery*/
 125         NULL, /* init*/
 126         NULL, /* finish*/
 127         0,      /* RSA flag*/
 128         NULL,
 129         NULL, /* OpenSSL sign*/
 130         NULL, /* OpenSSL verify*/
 131         NULL  /* keygen */
 132         };
 133 #endif
 134
 135 #ifndef OPENSSL_NO_DH
 136 /* Our internal DH_METHOD that we provide pointers to */
 137 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 138 static int surewarehk_modexp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
 139         const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 140 {
 141         return surewarehk_modexp(r, a, p, m, ctx);
 142 }
 143
 144 static DH_METHOD surewarehk_dh =
 145         {
 146         "SureWare DH method",
 147         NULL,/*gen_key*/
 148         NULL,/*agree,*/
 149         surewarehk_modexp_dh, /*dh mod exp*/
 150         NULL, /* init*/
 151         NULL, /* finish*/
 152         0,    /* flags*/
 153         NULL,
 154         NULL
 155         };
 156 #endif
 157
 158 static RAND_METHOD surewarehk_rand =
 159         {
 160         /* "SureWare RAND method", */
 161         surewarehk_rand_seed,
 162         surewarehk_rand_bytes,
 163         NULL,/*cleanup*/
 164         surewarehk_rand_add,
 165         surewarehk_rand_bytes,
 166         NULL,/*rand_status*/
 167         };
 168
 169 #ifndef OPENSSL_NO_DSA
 170 /* DSA stuff */
 171 static  DSA_SIG * surewarehk_dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
 172 static int surewarehk_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
 173                 BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
 174                 BN_CTX *ctx, BN_MONT_CTX *in_mont)
 175 {
 176         BIGNUM t;
 177         int to_return = 0;
 178         BN_init(&t);
 179         /* let rr = a1 ^ p1 mod m */
 180         if (!surewarehk_modexp(rr,a1,p1,m,ctx)) goto end;
 181         /* let t = a2 ^ p2 mod m */
 182         if (!surewarehk_modexp(&t,a2,p2,m,ctx)) goto end;
 183         /* let rr = rr * t mod m */
 184         if (!BN_mod_mul(rr,rr,&t,m,ctx)) goto end;
 185         to_return = 1;
 186 end:
 187         BN_free(&t);
 188         return to_return;
 189 }
 190
 191 static DSA_METHOD surewarehk_dsa =
 192         {
 193          "SureWare DSA method",
 194         surewarehk_dsa_do_sign,
 195         NULL,/*sign setup*/
 196         NULL,/*verify,*/
 197         surewarehk_dsa_mod_exp,/*mod exp*/
 198         NULL,/*bn mod exp*/
 199         NULL, /*init*/
 200         NULL,/*finish*/
 201         0,
 202         NULL,
 203         NULL,
 204         NULL
 205         };
 206 #endif
 207
 208 static const char *engine_sureware_id = "sureware";
 209 static const char *engine_sureware_name = "SureWare hardware engine support";
 210
 211 /* Now, to our own code */
 212
 213 /* As this is only ever called once, there's no need for locking
 214  * (indeed - the lock will already be held by our caller!!!) */
 215 static int bind_sureware(ENGINE *e)
 216 {
 217 #ifndef OPENSSL_NO_RSA
 218         const RSA_METHOD *meth1;
 219 #endif
 220 #ifndef OPENSSL_NO_DSA
 221         const DSA_METHOD *meth2;
 222 #endif
 223 #ifndef OPENSSL_NO_DH
 224         const DH_METHOD *meth3;
 225 #endif
 226
 227         if(!ENGINE_set_id(e, engine_sureware_id) ||
 228            !ENGINE_set_name(e, engine_sureware_name) ||
 229 #ifndef OPENSSL_NO_RSA
 230            !ENGINE_set_RSA(e, &surewarehk_rsa) ||
 231 #endif
 232 #ifndef OPENSSL_NO_DSA
 233            !ENGINE_set_DSA(e, &surewarehk_dsa) ||
 234 #endif
 235 #ifndef OPENSSL_NO_DH
 236            !ENGINE_set_DH(e, &surewarehk_dh) ||
 237 #endif
 238            !ENGINE_set_RAND(e, &surewarehk_rand) ||
 239            !ENGINE_set_destroy_function(e, surewarehk_destroy) ||
 240            !ENGINE_set_init_function(e, surewarehk_init) ||
 241            !ENGINE_set_finish_function(e, surewarehk_finish) ||
 242            !ENGINE_set_ctrl_function(e, surewarehk_ctrl) ||
 243            !ENGINE_set_load_privkey_function(e, surewarehk_load_privkey) ||
 244            !ENGINE_set_load_pubkey_function(e, surewarehk_load_pubkey))
 245           return 0;
 246
 247 #ifndef OPENSSL_NO_RSA
 248         /* We know that the "PKCS1_SSLeay()" functions hook properly
 249          * to the cswift-specific mod_exp and mod_exp_crt so we use
 250          * those functions. NB: We don't use ENGINE_openssl() or
 251          * anything "more generic" because something like the RSAref
 252          * code may not hook properly, and if you own one of these
 253          * cards then you have the right to do RSA operations on it
 254          * anyway! */
 255         meth1 = RSA_PKCS1_SSLeay();
 256         if (meth1)
 257         {
 258                 surewarehk_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 259                 surewarehk_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 260         }
 261 #endif
 262
 263 #ifndef OPENSSL_NO_DSA
 264         /* Use the DSA_OpenSSL() method and just hook the mod_exp-ish
 265          * bits. */
 266         meth2 = DSA_OpenSSL();
 267         if (meth2)
 268         {
 269                 surewarehk_dsa.dsa_do_verify = meth2->dsa_do_verify;
 270         }
 271 #endif
 272
 273 #ifndef OPENSSL_NO_DH
 274         /* Much the same for Diffie-Hellman */
 275         meth3 = DH_OpenSSL();
 276         if (meth3)
 277         {
 278                 surewarehk_dh.generate_key = meth3->generate_key;
 279                 surewarehk_dh.compute_key = meth3->compute_key;
 280         }
 281 #endif
 282
 283         /* Ensure the sureware error handling is set up */
 284         ERR_load_SUREWARE_strings();
 285         return 1;
 286 }
 287
 288 #ifndef OPENSSL_NO_DYNAMIC_ENGINE
 289 static int bind_helper(ENGINE *e, const char *id)
 290         {
 291         if(id && (strcmp(id, engine_sureware_id) != 0))
 292                 return 0;
 293         if(!bind_sureware(e))
 294                 return 0;
 295         return 1;
 296         }
 297 IMPLEMENT_DYNAMIC_CHECK_FN()
 298 IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 299 #else
 300 static ENGINE *engine_sureware(void)
 301         {
 302         ENGINE *ret = ENGINE_new();
 303         if(!ret)
 304                 return NULL;
 305         if(!bind_sureware(ret))
 306                 {
 307                 ENGINE_free(ret);
 308                 return NULL;
 309                 }
 310         return ret;
 311         }
 312
 313 void ENGINE_load_sureware(void)
 314         {
 315         /* Copied from eng_[openssl|dyn].c */
 316         ENGINE *toadd = engine_sureware();
 317         if(!toadd) return;
 318         ENGINE_add(toadd);
 319         ENGINE_free(toadd);
 320         ERR_clear_error();
 321         }
 322 #endif
 323
 324 /* This is a process-global DSO handle used for loading and unloading
 325  * the SureWareHook library. NB: This is only set (or unset) during an
 326  * init() or finish() call (reference counts permitting) and they're
 327  * operating with global locks, so this should be thread-safe
 328  * implicitly. */
 329 static DSO *surewarehk_dso = NULL;
 330 #ifndef OPENSSL_NO_RSA
 331 static int rsaHndidx = -1;      /* Index for KM handle.  Not really used yet. */
 332 #endif
 333 #ifndef OPENSSL_NO_DSA
 334 static int dsaHndidx = -1;      /* Index for KM handle.  Not really used yet. */
 335 #endif
 336
 337 /* These are the function pointers that are (un)set when the library has
 338  * successfully (un)loaded. */
 339 static SureWareHook_Init_t *p_surewarehk_Init = NULL;
 340 static SureWareHook_Finish_t *p_surewarehk_Finish = NULL;
 341 static SureWareHook_Rand_Bytes_t *p_surewarehk_Rand_Bytes = NULL;
 342 static SureWareHook_Rand_Seed_t *p_surewarehk_Rand_Seed = NULL;
 343 static SureWareHook_Load_Privkey_t *p_surewarehk_Load_Privkey = NULL;
 344 static SureWareHook_Info_Pubkey_t *p_surewarehk_Info_Pubkey = NULL;
 345 static SureWareHook_Load_Rsa_Pubkey_t *p_surewarehk_Load_Rsa_Pubkey = NULL;
 346 static SureWareHook_Load_Dsa_Pubkey_t *p_surewarehk_Load_Dsa_Pubkey = NULL;
 347 static SureWareHook_Free_t *p_surewarehk_Free=NULL;
 348 static SureWareHook_Rsa_Priv_Dec_t *p_surewarehk_Rsa_Priv_Dec=NULL;
 349 static SureWareHook_Rsa_Sign_t *p_surewarehk_Rsa_Sign=NULL;
 350 static SureWareHook_Dsa_Sign_t *p_surewarehk_Dsa_Sign=NULL;
 351 static SureWareHook_Mod_Exp_t *p_surewarehk_Mod_Exp=NULL;
 352
 353 /* Used in the DSO operations. */
 354 static const char *surewarehk_LIBNAME = "SureWareHook";
 355 static const char *n_surewarehk_Init = "SureWareHook_Init";
 356 static const char *n_surewarehk_Finish = "SureWareHook_Finish";
 357 static const char *n_surewarehk_Rand_Bytes="SureWareHook_Rand_Bytes";
 358 static const char *n_surewarehk_Rand_Seed="SureWareHook_Rand_Seed";
 359 static const char *n_surewarehk_Load_Privkey="SureWareHook_Load_Privkey";
 360 static const char *n_surewarehk_Info_Pubkey="SureWareHook_Info_Pubkey";
 361 static const char *n_surewarehk_Load_Rsa_Pubkey="SureWareHook_Load_Rsa_Pubkey";
 362 static const char *n_surewarehk_Load_Dsa_Pubkey="SureWareHook_Load_Dsa_Pubkey";
 363 static const char *n_surewarehk_Free="SureWareHook_Free";
 364 static const char *n_surewarehk_Rsa_Priv_Dec="SureWareHook_Rsa_Priv_Dec";
 365 static const char *n_surewarehk_Rsa_Sign="SureWareHook_Rsa_Sign";
 366 static const char *n_surewarehk_Dsa_Sign="SureWareHook_Dsa_Sign";
 367 static const char *n_surewarehk_Mod_Exp="SureWareHook_Mod_Exp";
 368 static BIO *logstream = NULL;
 369
 370 /* SureWareHook library functions and mechanics - these are used by the
 371  * higher-level functions further down. NB: As and where there's no
 372  * error checking, take a look lower down where these functions are
 373  * called, the checking and error handling is probably down there.
 374 */
 375 static int threadsafe=1;
 376 static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
 377 {
 378         int to_return = 1;
 379
 380         switch(cmd)
 381         {
 382                 case ENGINE_CTRL_SET_LOGSTREAM:
 383                 {
 384                         BIO *bio = (BIO *)p;
 385                         CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 386                         if (logstream)
 387                         {
 388                                 BIO_free(logstream);
 389                                 logstream = NULL;
 390                         }
 391                         if (CRYPTO_add(&bio->references,1,CRYPTO_LOCK_BIO) > 1)
 392                                 logstream = bio;
 393                         else
 394                                 SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,SUREWARE_R_BIO_WAS_FREED);
 395                 }
 396                 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 397                 break;
 398         /* This will prevent the initialisation function from "installing"
 399          * the mutex-handling callbacks, even if they are available from
 400          * within the library (or were provided to the library from the
 401          * calling application). This is to remove any baggage for
 402          * applications not using multithreading. */
 403         case ENGINE_CTRL_CHIL_NO_LOCKING:
 404                 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 405                 threadsafe = 0;
 406                 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 407                 break;
 408
 409         /* The command isn't understood by this engine */
 410         default:
 411                 SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,
 412                         ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 413                 to_return = 0;
 414                 break;
 415                 }
 416
 417         return to_return;
 418 }
 419
 420 /* Destructor (complements the "ENGINE_surewarehk()" constructor) */
 421 static int surewarehk_destroy(ENGINE *e)
 422 {
 423         ERR_unload_SUREWARE_strings();
 424         return 1;
 425 }
 426
 427 /* (de)initialisation functions. */
 428 static int surewarehk_init(ENGINE *e)
 429 {
 430         char msg[64]="ENGINE_init";
 431         SureWareHook_Init_t *p1=NULL;
 432         SureWareHook_Finish_t *p2=NULL;
 433         SureWareHook_Rand_Bytes_t *p3=NULL;
 434         SureWareHook_Rand_Seed_t *p4=NULL;
 435         SureWareHook_Load_Privkey_t *p5=NULL;
 436         SureWareHook_Load_Rsa_Pubkey_t *p6=NULL;
 437         SureWareHook_Free_t *p7=NULL;
 438         SureWareHook_Rsa_Priv_Dec_t *p8=NULL;
 439         SureWareHook_Rsa_Sign_t *p9=NULL;
 440         SureWareHook_Dsa_Sign_t *p12=NULL;
 441         SureWareHook_Info_Pubkey_t *p13=NULL;
 442         SureWareHook_Load_Dsa_Pubkey_t *p14=NULL;
 443         SureWareHook_Mod_Exp_t *p15=NULL;
 444
 445         if(surewarehk_dso != NULL)
 446         {
 447                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_ALREADY_LOADED);
 448                 goto err;
 449         }
 450         /* Attempt to load libsurewarehk.so/surewarehk.dll/whatever. */
 451         surewarehk_dso = DSO_load(NULL, surewarehk_LIBNAME, NULL, 0);
 452         if(surewarehk_dso == NULL)
 453         {
 454                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_DSO_FAILURE);
 455                 goto err;
 456         }
 457         if(!(p1=(SureWareHook_Init_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Init)) ||
 458            !(p2=(SureWareHook_Finish_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Finish)) ||
 459            !(p3=(SureWareHook_Rand_Bytes_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rand_Bytes)) ||
 460            !(p4=(SureWareHook_Rand_Seed_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rand_Seed)) ||
 461            !(p5=(SureWareHook_Load_Privkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Privkey)) ||
 462            !(p6=(SureWareHook_Load_Rsa_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Rsa_Pubkey)) ||
 463            !(p7=(SureWareHook_Free_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Free)) ||
 464            !(p8=(SureWareHook_Rsa_Priv_Dec_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rsa_Priv_Dec)) ||
 465            !(p9=(SureWareHook_Rsa_Sign_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rsa_Sign)) ||
 466            !(p12=(SureWareHook_Dsa_Sign_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Dsa_Sign)) ||
 467            !(p13=(SureWareHook_Info_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Info_Pubkey)) ||
 468            !(p14=(SureWareHook_Load_Dsa_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Dsa_Pubkey)) ||
 469            !(p15=(SureWareHook_Mod_Exp_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Mod_Exp)))
 470         {
 471                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_DSO_FAILURE);
 472                 goto err;
 473         }
 474         /* Copy the pointers */
 475         p_surewarehk_Init = p1;
 476         p_surewarehk_Finish = p2;
 477         p_surewarehk_Rand_Bytes = p3;
 478         p_surewarehk_Rand_Seed = p4;
 479         p_surewarehk_Load_Privkey = p5;
 480         p_surewarehk_Load_Rsa_Pubkey = p6;
 481         p_surewarehk_Free = p7;
 482         p_surewarehk_Rsa_Priv_Dec = p8;
 483         p_surewarehk_Rsa_Sign = p9;
 484         p_surewarehk_Dsa_Sign = p12;
 485         p_surewarehk_Info_Pubkey = p13;
 486         p_surewarehk_Load_Dsa_Pubkey = p14;
 487         p_surewarehk_Mod_Exp = p15;
 488         /* Contact the hardware and initialises it. */
 489         if(p_surewarehk_Init(msg,threadsafe)==SUREWAREHOOK_ERROR_UNIT_FAILURE)
 490         {
 491                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,SUREWARE_R_UNIT_FAILURE);
 492                 goto err;
 493         }
 494         if(p_surewarehk_Init(msg,threadsafe)==SUREWAREHOOK_ERROR_UNIT_FAILURE)
 495         {
 496                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,SUREWARE_R_UNIT_FAILURE);
 497                 goto err;
 498         }
 499         /* try to load the default private key, if failed does not return a failure but
 500            wait for an explicit ENGINE_load_privakey */
 501         surewarehk_load_privkey(e,NULL,NULL,NULL);
 502
 503         /* Everything's fine. */
 504 #ifndef OPENSSL_NO_RSA
 505         if (rsaHndidx == -1)
 506                 rsaHndidx = RSA_get_ex_new_index(0,
 507                                                 "SureWareHook RSA key handle",
 508                                                 NULL, NULL, surewarehk_ex_free);
 509 #endif
 510 #ifndef OPENSSL_NO_DSA
 511         if (dsaHndidx == -1)
 512                 dsaHndidx = DSA_get_ex_new_index(0,
 513                                                 "SureWareHook DSA key handle",
 514                                                 NULL, NULL, surewarehk_ex_free);
 515 #endif
 516
 517         return 1;
 518 err:
 519         if(surewarehk_dso)
 520                 DSO_free(surewarehk_dso);
 521         surewarehk_dso = NULL;
 522         p_surewarehk_Init = NULL;
 523         p_surewarehk_Finish = NULL;
 524         p_surewarehk_Rand_Bytes = NULL;
 525         p_surewarehk_Rand_Seed = NULL;
 526         p_surewarehk_Load_Privkey = NULL;
 527         p_surewarehk_Load_Rsa_Pubkey = NULL;
 528         p_surewarehk_Free = NULL;
 529         p_surewarehk_Rsa_Priv_Dec = NULL;
 530         p_surewarehk_Rsa_Sign = NULL;
 531         p_surewarehk_Dsa_Sign = NULL;
 532         p_surewarehk_Info_Pubkey = NULL;
 533         p_surewarehk_Load_Dsa_Pubkey = NULL;
 534         p_surewarehk_Mod_Exp = NULL;
 535         return 0;
 536 }
 537
 538 static int surewarehk_finish(ENGINE *e)
 539 {
 540         int to_return = 1;
 541         if(surewarehk_dso == NULL)
 542                 {
 543                 SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH,ENGINE_R_NOT_LOADED);
 544                 to_return = 0;
 545                 goto err;
 546                 }
 547         p_surewarehk_Finish();
 548         if(!DSO_free(surewarehk_dso))
 549                 {
 550                 SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH,ENGINE_R_DSO_FAILURE);
 551                 to_return = 0;
 552                 goto err;
 553                 }
 554  err:
 555         if (logstream)
 556                 BIO_free(logstream);
 557         surewarehk_dso = NULL;
 558         p_surewarehk_Init = NULL;
 559         p_surewarehk_Finish = NULL;
 560         p_surewarehk_Rand_Bytes = NULL;
 561         p_surewarehk_Rand_Seed = NULL;
 562         p_surewarehk_Load_Privkey = NULL;
 563         p_surewarehk_Load_Rsa_Pubkey = NULL;
 564         p_surewarehk_Free = NULL;
 565         p_surewarehk_Rsa_Priv_Dec = NULL;
 566         p_surewarehk_Rsa_Sign = NULL;
 567         p_surewarehk_Dsa_Sign = NULL;
 568         p_surewarehk_Info_Pubkey = NULL;
 569         p_surewarehk_Load_Dsa_Pubkey = NULL;
 570         p_surewarehk_Mod_Exp = NULL;
 571         return to_return;
 572 }
 573
 574 static void surewarehk_error_handling(char *const msg,int func,int ret)
 575 {
 576         switch (ret)
 577         {
 578                 case SUREWAREHOOK_ERROR_UNIT_FAILURE:
 579                         ENGINEerr(func,SUREWARE_R_UNIT_FAILURE);
 580                         break;
 581                 case SUREWAREHOOK_ERROR_FALLBACK:
 582                         ENGINEerr(func,SUREWARE_R_REQUEST_FALLBACK);
 583                         break;
 584                 case SUREWAREHOOK_ERROR_DATA_SIZE:
 585                         ENGINEerr(func,SUREWARE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
 586                         break;
 587                 case SUREWAREHOOK_ERROR_INVALID_PAD:
 588                         ENGINEerr(func,SUREWARE_R_PADDING_CHECK_FAILED);
 589                         break;
 590                 default:
 591                         ENGINEerr(func,SUREWARE_R_REQUEST_FAILED);
 592                         break;
 593                 case 1:/*nothing*/
 594                         msg[0]='\0';
 595         }
 596         if (*msg)
 597         {
 598                 ERR_add_error_data(1,msg);
 599                 if (logstream)
 600                 {
 601                         CRYPTO_w_lock(CRYPTO_LOCK_BIO);
 602                         BIO_write(logstream, msg, strlen(msg));
 603                         CRYPTO_w_unlock(CRYPTO_LOCK_BIO);
 604                 }
 605         }
 606 }
 607
 608 static int surewarehk_rand_bytes(unsigned char *buf, int num)
 609 {
 610         int ret=0;
 611         char msg[64]="ENGINE_rand_bytes";
 612         if(!p_surewarehk_Rand_Bytes)
 613         {
 614                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_BYTES,ENGINE_R_NOT_INITIALISED);
 615         }
 616         else
 617         {
 618                 ret = p_surewarehk_Rand_Bytes(msg,buf, num);
 619                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RAND_BYTES,ret);
 620         }
 621         return ret==1 ? 1 : 0;
 622 }
 623
 624 static void surewarehk_rand_seed(const void *buf, int num)
 625 {
 626         int ret=0;
 627         char msg[64]="ENGINE_rand_seed";
 628         if(!p_surewarehk_Rand_Seed)
 629         {
 630                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_SEED,ENGINE_R_NOT_INITIALISED);
 631         }
 632         else
 633         {
 634                 ret = p_surewarehk_Rand_Seed(msg,buf, num);
 635                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RAND_SEED,ret);
 636         }
 637 }
 638
 639 static void surewarehk_rand_add(const void *buf, int num, double entropy)
 640 {
 641         surewarehk_rand_seed(buf,num);
 642 }
 643
 644 static EVP_PKEY* sureware_load_public(ENGINE *e,const char *key_id,char *hptr,unsigned long el,char keytype)
 645 {
 646         EVP_PKEY *res = NULL;
 647 #ifndef OPENSSL_NO_RSA
 648         RSA *rsatmp = NULL;
 649 #endif
 650 #ifndef OPENSSL_NO_DSA
 651         DSA *dsatmp=NULL;
 652 #endif
 653         char msg[64]="sureware_load_public";
 654         int ret=0;
 655         if(!p_surewarehk_Load_Rsa_Pubkey || !p_surewarehk_Load_Dsa_Pubkey)
 656         {
 657                 SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_NOT_INITIALISED);
 658                 goto err;
 659         }
 660         switch (keytype)
 661         {
 662 #ifndef OPENSSL_NO_RSA
 663         case 1: /*RSA*/
 664                 /* set private external reference */
 665                 rsatmp = RSA_new_method(e);
 666                 RSA_set_ex_data(rsatmp,rsaHndidx,hptr);
 667                 rsatmp->flags |= RSA_FLAG_EXT_PKEY;
 668
 669                 /* set public big nums*/
 670                 rsatmp->e = BN_new();
 671                 rsatmp->n = BN_new();
 672                 bn_expand2(rsatmp->e, el/sizeof(BN_ULONG));
 673                 bn_expand2(rsatmp->n, el/sizeof(BN_ULONG));
 674                 if (!rsatmp->e || rsatmp->e->dmax!=(int)(el/sizeof(BN_ULONG))||
 675                         !rsatmp->n || rsatmp->n->dmax!=(int)(el/sizeof(BN_ULONG)))
 676                         goto err;
 677                 ret=p_surewarehk_Load_Rsa_Pubkey(msg,key_id,el,
 678                                                  (unsigned long *)rsatmp->n->d,
 679                                                  (unsigned long *)rsatmp->e->d);
 680                 surewarehk_error_handling(msg,SUREWARE_F_SUREWARE_LOAD_PUBLIC,ret);
 681                 if (ret!=1)
 682                 {
 683                         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 684                         goto err;
 685                 }
 686                 /* normalise pub e and pub n */
 687                 rsatmp->e->top=el/sizeof(BN_ULONG);
 688                 bn_fix_top(rsatmp->e);
 689                 rsatmp->n->top=el/sizeof(BN_ULONG);
 690                 bn_fix_top(rsatmp->n);
 691                 /* create an EVP object: engine + rsa key */
 692                 res = EVP_PKEY_new();
 693                 EVP_PKEY_assign_RSA(res, rsatmp);
 694                 break;
 695 #endif
 696
 697 #ifndef OPENSSL_NO_DSA
 698         case 2:/*DSA*/
 699                 /* set private/public external reference */
 700                 dsatmp = DSA_new_method(e);
 701                 DSA_set_ex_data(dsatmp,dsaHndidx,hptr);
 702                 /*dsatmp->flags |= DSA_FLAG_EXT_PKEY;*/
 703
 704                 /* set public key*/
 705                 dsatmp->pub_key = BN_new();
 706                 dsatmp->p = BN_new();
 707                 dsatmp->q = BN_new();
 708                 dsatmp->g = BN_new();
 709                 bn_expand2(dsatmp->pub_key, el/sizeof(BN_ULONG));
 710                 bn_expand2(dsatmp->p, el/sizeof(BN_ULONG));
 711                 bn_expand2(dsatmp->q, 20/sizeof(BN_ULONG));
 712                 bn_expand2(dsatmp->g, el/sizeof(BN_ULONG));
 713                 if (!dsatmp->pub_key || dsatmp->pub_key->dmax!=(int)(el/sizeof(BN_ULONG))||
 714                         !dsatmp->p || dsatmp->p->dmax!=(int)(el/sizeof(BN_ULONG)) ||
 715                         !dsatmp->q || dsatmp->q->dmax!=20/sizeof(BN_ULONG) ||
 716                         !dsatmp->g || dsatmp->g->dmax!=(int)(el/sizeof(BN_ULONG)))
 717                         goto err;
 718
 719                 ret=p_surewarehk_Load_Dsa_Pubkey(msg,key_id,el,
 720                                                  (unsigned long *)dsatmp->pub_key->d,
 721                                                  (unsigned long *)dsatmp->p->d,
 722                                                  (unsigned long *)dsatmp->q->d,
 723                                                  (unsigned long *)dsatmp->g->d);
 724                 surewarehk_error_handling(msg,SUREWARE_F_SUREWARE_LOAD_PUBLIC,ret);
 725                 if (ret!=1)
 726                 {
 727                         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 728                         goto err;
 729                 }
 730                 /* set parameters */
 731                 /* normalise pubkey and parameters in case of */
 732                 dsatmp->pub_key->top=el/sizeof(BN_ULONG);
 733                 bn_fix_top(dsatmp->pub_key);
 734                 dsatmp->p->top=el/sizeof(BN_ULONG);
 735                 bn_fix_top(dsatmp->p);
 736                 dsatmp->q->top=20/sizeof(BN_ULONG);
 737                 bn_fix_top(dsatmp->q);
 738                 dsatmp->g->top=el/sizeof(BN_ULONG);
 739                 bn_fix_top(dsatmp->g);
 740
 741                 /* create an EVP object: engine + rsa key */
 742                 res = EVP_PKEY_new();
 743                 EVP_PKEY_assign_DSA(res, dsatmp);
 744                 break;
 745 #endif
 746
 747         default:
 748                 SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 749                 goto err;
 750         }
 751         return res;
 752  err:
 753         if (res)
 754                 EVP_PKEY_free(res);
 755 #ifndef OPENSSL_NO_RSA
 756         if (rsatmp)
 757                 RSA_free(rsatmp);
 758 #endif
 759 #ifndef OPENSSL_NO_DSA
 760         if (dsatmp)
 761                 DSA_free(dsatmp);
 762 #endif
 763         return NULL;
 764 }
 765
 766 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
 767                                          UI_METHOD *ui_method, void *callback_data)
 768 {
 769         EVP_PKEY *res = NULL;
 770         int ret=0;
 771         unsigned long el=0;
 772         char *hptr=NULL;
 773         char keytype=0;
 774         char msg[64]="ENGINE_load_privkey";
 775
 776         if(!p_surewarehk_Load_Privkey)
 777         {
 778                 SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,ENGINE_R_NOT_INITIALISED);
 779         }
 780         else
 781         {
 782                 ret=p_surewarehk_Load_Privkey(msg,key_id,&hptr,&el,&keytype);
 783                 if (ret!=1)
 784                 {
 785                         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 786                         ERR_add_error_data(1,msg);
 787                 }
 788                 else
 789                         res=sureware_load_public(e,key_id,hptr,el,keytype);
 790         }
 791         return res;
 792 }
 793
 794 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
 795                                          UI_METHOD *ui_method, void *callback_data)
 796 {
 797         EVP_PKEY *res = NULL;
 798         int ret=0;
 799         unsigned long el=0;
 800         char *hptr=NULL;
 801         char keytype=0;
 802         char msg[64]="ENGINE_load_pubkey";
 803
 804         if(!p_surewarehk_Info_Pubkey)
 805         {
 806                 SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,ENGINE_R_NOT_INITIALISED);
 807         }
 808         else
 809         {
 810                 /* call once to identify if DSA or RSA */
 811                 ret=p_surewarehk_Info_Pubkey(msg,key_id,&el,&keytype);
 812                 if (ret!=1)
 813                 {
 814                         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 815                         ERR_add_error_data(1,msg);
 816                 }
 817                 else
 818                         res=sureware_load_public(e,key_id,hptr,el,keytype);
 819         }
 820         return res;
 821 }
 822
 823 /* This cleans up an RSA/DSA KM key(do not destroy the key into the hardware)
 824 , called when ex_data is freed */
 825 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 826         int idx,long argl, void *argp)
 827 {
 828         if(!p_surewarehk_Free)
 829         {
 830                 SUREWAREerr(SUREWARE_F_SUREWAREHK_EX_FREE,ENGINE_R_NOT_INITIALISED);
 831         }
 832         else
 833                 p_surewarehk_Free((char *)item,0);
 834 }
 835
 836 #if 0
 837 /* not currently used (bug?) */
 838 /* This cleans up an DH KM key (destroys the key into hardware),
 839 called when ex_data is freed */
 840 static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 841         int idx,long argl, void *argp)
 842 {
 843         if(!p_surewarehk_Free)
 844         {
 845                 SUREWAREerr(SUREWARE_F_SUREWAREHK_DH_EX_FREE,ENGINE_R_NOT_INITIALISED);
 846         }
 847         else
 848                 p_surewarehk_Free((char *)item,1);
 849 }
 850 #endif
 851
 852 /*
 853 * return number of decrypted bytes
 854 */
 855 #ifndef OPENSSL_NO_RSA
 856 static int surewarehk_rsa_priv_dec(int flen,const unsigned char *from,unsigned char *to,
 857                         RSA *rsa,int padding)
 858 {
 859         int ret=0,tlen;
 860         char *buf=NULL,*hptr=NULL;
 861         char msg[64]="ENGINE_rsa_priv_dec";
 862         if (!p_surewarehk_Rsa_Priv_Dec)
 863         {
 864                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ENGINE_R_NOT_INITIALISED);
 865         }
 866         /* extract ref to private key */
 867         else if (!(hptr=RSA_get_ex_data(rsa, rsaHndidx)))
 868         {
 869                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,SUREWARE_R_MISSING_KEY_COMPONENTS);
 870                 goto err;
 871         }
 872         /* analyse what padding we can do into the hardware */
 873         if (padding==RSA_PKCS1_PADDING)
 874         {
 875                 /* do it one shot */
 876                 ret=p_surewarehk_Rsa_Priv_Dec(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_PKCS1_PAD);
 877                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ret);
 878                 if (ret!=1)
 879                         goto err;
 880                 ret=tlen;
 881         }
 882         else /* do with no padding into hardware */
 883         {
 884                 ret=p_surewarehk_Rsa_Priv_Dec(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_NO_PAD);
 885                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ret);
 886                 if (ret!=1)
 887                         goto err;
 888                 /* intermediate buffer for padding */
 889                 if ((buf=OPENSSL_malloc(tlen)) == NULL)
 890                 {
 891                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ERR_R_MALLOC_FAILURE);
 892                         goto err;
 893                 }
 894                 memcpy(buf,to,tlen);/* transfert to into buf */
 895                 switch (padding) /* check padding in software */
 896                 {
 897 #ifndef OPENSSL_NO_SHA
 898                 case RSA_PKCS1_OAEP_PADDING:
 899                         ret=RSA_padding_check_PKCS1_OAEP(to,tlen,(unsigned char *)buf,tlen,tlen,NULL,0);
 900                         break;
 901 #endif
 902                 case RSA_SSLV23_PADDING:
 903                         ret=RSA_padding_check_SSLv23(to,tlen,(unsigned char *)buf,flen,tlen);
 904                         break;
 905                 case RSA_NO_PADDING:
 906                         ret=RSA_padding_check_none(to,tlen,(unsigned char *)buf,flen,tlen);
 907                         break;
 908                 default:
 909                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,SUREWARE_R_UNKNOWN_PADDING_TYPE);
 910                         goto err;
 911                 }
 912                 if (ret < 0)
 913                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,SUREWARE_R_PADDING_CHECK_FAILED);
 914         }
 915 err:
 916         if (buf)
 917         {
 918                 OPENSSL_cleanse(buf,tlen);
 919                 OPENSSL_free(buf);
 920         }
 921         return ret;
 922 }
 923
 924 /*
 925 * Does what OpenSSL rsa_priv_enc does.
 926 */
 927 static int surewarehk_rsa_sign(int flen,const unsigned char *from,unsigned char *to,
 928                             RSA *rsa,int padding)
 929 {
 930         int ret=0,tlen;
 931         char *hptr=NULL;
 932         char msg[64]="ENGINE_rsa_sign";
 933         if (!p_surewarehk_Rsa_Sign)
 934         {
 935                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,ENGINE_R_NOT_INITIALISED);
 936         }
 937         /* extract ref to private key */
 938         else if (!(hptr=RSA_get_ex_data(rsa, rsaHndidx)))
 939         {
 940                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,SUREWARE_R_MISSING_KEY_COMPONENTS);
 941         }
 942         else
 943         {
 944                 switch (padding)
 945                 {
 946                 case RSA_PKCS1_PADDING: /* do it in one shot */
 947                         ret=p_surewarehk_Rsa_Sign(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_PKCS1_PAD);
 948                         surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_SIGN,ret);
 949                         break;
 950                 case RSA_NO_PADDING:
 951                 default:
 952                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,SUREWARE_R_UNKNOWN_PADDING_TYPE);
 953                 }
 954         }
 955         return ret==1 ? tlen : ret;
 956 }
 957
 958 #endif
 959
 960 #ifndef OPENSSL_NO_DSA
 961 /* DSA sign and verify */
 962 static  DSA_SIG * surewarehk_dsa_do_sign(const unsigned char *from, int flen, DSA *dsa)
 963 {
 964         int ret=0;
 965         char *hptr=NULL;
 966         DSA_SIG *psign=NULL;
 967         char msg[64]="ENGINE_dsa_do_sign";
 968         if (!p_surewarehk_Dsa_Sign)
 969         {
 970                 SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ENGINE_R_NOT_INITIALISED);
 971         }
 972         /* extract ref to private key */
 973         else if (!(hptr=DSA_get_ex_data(dsa, dsaHndidx)))
 974         {
 975                 SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,SUREWARE_R_MISSING_KEY_COMPONENTS);
 976         }
 977         else
 978         {
 979                 if((psign = DSA_SIG_new()) == NULL)
 980                 {
 981                         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ERR_R_MALLOC_FAILURE);
 982                         goto err;
 983                 }
 984                 psign->r=BN_new();
 985                 psign->s=BN_new();
 986                 bn_expand2(psign->r, 20/sizeof(BN_ULONG));
 987                 bn_expand2(psign->s, 20/sizeof(BN_ULONG));
 988                 if (!psign->r || psign->r->dmax!=20/sizeof(BN_ULONG) ||
 989                         !psign->s || psign->s->dmax!=20/sizeof(BN_ULONG))
 990                         goto err;
 991                 ret=p_surewarehk_Dsa_Sign(msg,flen,from,
 992                                           (unsigned long *)psign->r->d,
 993                                           (unsigned long *)psign->s->d,
 994                                           hptr);
 995                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ret);
 996         }
 997         psign->r->top=20/sizeof(BN_ULONG);
 998         bn_fix_top(psign->r);
 999         psign->s->top=20/sizeof(BN_ULONG);
1000         bn_fix_top(psign->s);
1001
1002 err:
1003         if (psign)
1004         {
1005                 DSA_SIG_free(psign);
1006                 psign=NULL;
1007         }
1008         return psign;
1009 }
1010 #endif
1011
1012 static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
1013                              const BIGNUM *m, BN_CTX *ctx)
1014 {
1015         int ret=0;
1016         char msg[64]="ENGINE_modexp";
1017         if (!p_surewarehk_Mod_Exp)
1018         {
1019                 SUREWAREerr(SUREWARE_F_SUREWAREHK_MODEXP,ENGINE_R_NOT_INITIALISED);
1020         }
1021         else
1022         {
1023                 bn_expand2(r,m->top);
1024                 if (r && r->dmax==m->top)
1025                 {
1026                         /* do it*/
1027                         ret=p_surewarehk_Mod_Exp(msg,
1028                                                  m->top*sizeof(BN_ULONG),
1029                                                  (unsigned long *)m->d,
1030                                                  p->top*sizeof(BN_ULONG),
1031                                                  (unsigned long *)p->d,
1032                                                  a->top*sizeof(BN_ULONG),
1033                                                  (unsigned long *)a->d,
1034                                                  (unsigned long *)r->d);
1035                         surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_MODEXP,ret);
1036                         if (ret==1)
1037                         {
1038                                 /* normalise result */
1039                                 r->top=m->top;
1040                                 bn_fix_top(r);
1041                         }
1042                 }
1043         }
1044         return ret;
1045 }
1046 #endif /* !OPENSSL_NO_HW_SureWare */
1047 #endif /* !OPENSSL_NO_HW */