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