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