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