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