engines/e_sureware.c

   1 /* Written by Corinne Dive-Reclus(cdive@baltimore.com)
   2 *
   3 *
   4 * Redistribution and use in source and binary forms, with or without
   5 * modification, are permitted provided that the following conditions
   6 * are met:
   7 *
   8 * 1. Redistributions of source code must retain the above copyright
   9 *    notice, this list of conditions and the following disclaimer.
  10 *
  11 * 2. Redistributions in binary form must reproduce the above copyright
  12 *    notice, this list of conditions and the following disclaimer in
  13 *    the documentation and/or other materials provided with the
  14 *    distribution.
  15 *
  16 * 3. All advertising materials mentioning features or use of this
  17 *    software must display the following acknowledgment:
  18 *    "This product includes software developed by the OpenSSL Project
  19 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20 *
  21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22 *    endorse or promote products derived from this software without
  23 *    prior written permission. For written permission, please contact
  24 *    licensing@OpenSSL.org.
  25 *
  26 * 5. Products derived from this software may not be called "OpenSSL"
  27 *    nor may "OpenSSL" appear in their names without prior written
  28 *    permission of the OpenSSL Project.
  29 *
  30 * 6. Redistributions of any form whatsoever must retain the following
  31 *    acknowledgment:
  32 *    "This product includes software developed by the OpenSSL Project
  33 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34 *
  35 * Written by Corinne Dive-Reclus(cdive@baltimore.com)
  36 *
  37 * Copyright@2001 Baltimore Technologies Ltd.
  38 * All right Reserved.
  39 *                                                                                                                                                                                               *
  40 *               THIS FILE IS PROVIDED BY BALTIMORE TECHNOLOGIES ``AS IS'' AND                                                                                                                                                   *
  41 *               ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE                                   *
  42 *               IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE                              *
  43 *               ARE DISCLAIMED.  IN NO EVENT SHALL BALTIMORE TECHNOLOGIES BE LIABLE                                             *
  44 *               FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL                              *
  45 *               DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS                                 *
  46 *               OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)                                   *
  47 *               HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT                              *
  48 *               LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY                               *
  49 *               OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF                                  *
  50 *               SUCH DAMAGE.                                                                                                                                                    *
  51 ====================================================================*/
  52
  53 #include <stdio.h>
  54 #include <string.h>
  55 #include <openssl/crypto.h>
  56 #include <openssl/pem.h>
  57 #include <openssl/dso.h>
  58 #include <openssl/engine.h>
  59 #include <openssl/rand.h>
  60 #ifndef OPENSSL_NO_RSA
  61 #include <openssl/rsa.h>
  62 #endif
  63 #ifndef OPENSSL_NO_DSA
  64 #include <openssl/dsa.h>
  65 #endif
  66 #ifndef OPENSSL_NO_DH
  67 #include <openssl/dh.h>
  68 #endif
  69 #include <openssl/bn.h>
  70
  71 #ifndef OPENSSL_NO_HW
  72 #ifndef OPENSSL_NO_HW_SUREWARE
  73
  74 #ifdef FLAT_INC
  75 #include "sureware.h"
  76 #else
  77 #include "vendor_defns/sureware.h"
  78 #endif
  79
  80 #define SUREWARE_LIB_NAME "sureware engine"
  81 #include "e_sureware_err.c"
  82
  83 static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
  84 static int surewarehk_destroy(ENGINE *e);
  85 static int surewarehk_init(ENGINE *e);
  86 static int surewarehk_finish(ENGINE *e);
  87 static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  88         const BIGNUM *m, BN_CTX *ctx);
  89
  90 /* RSA stuff */
  91 #ifndef OPENSSL_NO_RSA
  92 static int surewarehk_rsa_priv_dec(int flen,const unsigned char *from,unsigned char *to,
  93                         RSA *rsa,int padding);
  94 static int surewarehk_rsa_sign(int flen,const unsigned char *from,unsigned char *to,
  95                             RSA *rsa,int padding);
  96 #endif
  97
  98 /* RAND stuff */
  99 static int surewarehk_rand_bytes(unsigned char *buf, int num);
 100 static int surewarehk_rand_seed(const void *buf, int num);
 101 static int surewarehk_rand_add(const void *buf, int num, double entropy);
 102
 103 /* KM stuff */
 104 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
 105         UI_METHOD *ui_method, void *callback_data);
 106 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
 107         UI_METHOD *ui_method, void *callback_data);
 108 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 109         int idx,long argl, void *argp);
 110 #if 0
 111 static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 112         int idx,long argl, void *argp);
 113 #endif
 114
 115 #ifndef OPENSSL_NO_RSA
 116 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 117 static int surewarehk_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 118                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 119 {
 120         return surewarehk_modexp(r, a, p, m, ctx);
 121 }
 122
 123 /* Our internal RSA_METHOD that we provide pointers to */
 124 static RSA_METHOD surewarehk_rsa =
 125         {
 126         "SureWare RSA method",
 127         NULL, /* pub_enc*/
 128         NULL, /* pub_dec*/
 129         surewarehk_rsa_sign, /* our rsa_sign is OpenSSL priv_enc*/
 130         surewarehk_rsa_priv_dec, /* priv_dec*/
 131         NULL, /*mod_exp*/
 132         surewarehk_mod_exp_mont, /*mod_exp_mongomery*/
 133         NULL, /* init*/
 134         NULL, /* finish*/
 135         0,      /* RSA flag*/
 136         NULL,
 137         NULL, /* OpenSSL sign*/
 138         NULL, /* OpenSSL verify*/
 139         NULL  /* keygen */
 140         };
 141 #endif
 142
 143 #ifndef OPENSSL_NO_DH
 144 /* Our internal DH_METHOD that we provide pointers to */
 145 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 146 static int surewarehk_modexp_dh(const DH *dh, BIGNUM *r, const BIGNUM *a,
 147         const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 148 {
 149         return surewarehk_modexp(r, a, p, m, ctx);
 150 }
 151
 152 static DH_METHOD surewarehk_dh =
 153         {
 154         "SureWare DH method",
 155         NULL,/*gen_key*/
 156         NULL,/*agree,*/
 157         surewarehk_modexp_dh, /*dh mod exp*/
 158         NULL, /* init*/
 159         NULL, /* finish*/
 160         0,    /* flags*/
 161         NULL,
 162         NULL
 163         };
 164 #endif
 165
 166 static RAND_METHOD surewarehk_rand =
 167         {
 168         /* "SureWare RAND method", */
 169         surewarehk_rand_seed,
 170         surewarehk_rand_bytes,
 171         NULL,/*cleanup*/
 172         surewarehk_rand_add,
 173         surewarehk_rand_bytes,
 174         NULL,/*rand_status*/
 175         };
 176
 177 #ifndef OPENSSL_NO_DSA
 178 /* DSA stuff */
 179 static  DSA_SIG * surewarehk_dsa_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
 180 static int surewarehk_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
 181                 BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
 182                 BN_CTX *ctx, BN_MONT_CTX *in_mont)
 183 {
 184         BIGNUM t;
 185         int to_return = 0;
 186         BN_init(&t);
 187         /* let rr = a1 ^ p1 mod m */
 188         if (!surewarehk_modexp(rr,a1,p1,m,ctx)) goto end;
 189         /* let t = a2 ^ p2 mod m */
 190         if (!surewarehk_modexp(&t,a2,p2,m,ctx)) goto end;
 191         /* let rr = rr * t mod m */
 192         if (!BN_mod_mul(rr,rr,&t,m,ctx)) goto end;
 193         to_return = 1;
 194 end:
 195         BN_free(&t);
 196         return to_return;
 197 }
 198
 199 static DSA_METHOD surewarehk_dsa =
 200         {
 201          "SureWare DSA method",
 202         surewarehk_dsa_do_sign,
 203         NULL,/*sign setup*/
 204         NULL,/*verify,*/
 205         surewarehk_dsa_mod_exp,/*mod exp*/
 206         NULL,/*bn mod exp*/
 207         NULL, /*init*/
 208         NULL,/*finish*/
 209         0,
 210         NULL,
 211         NULL,
 212         NULL
 213         };
 214 #endif
 215
 216 static const char *engine_sureware_id = "sureware";
 217 static const char *engine_sureware_name = "SureWare hardware engine support";
 218
 219 /* Now, to our own code */
 220
 221 /* As this is only ever called once, there's no need for locking
 222  * (indeed - the lock will already be held by our caller!!!) */
 223 static int bind_sureware(ENGINE *e)
 224 {
 225 #ifndef OPENSSL_NO_RSA
 226         const RSA_METHOD *meth1;
 227 #endif
 228 #ifndef OPENSSL_NO_DSA
 229         const DSA_METHOD *meth2;
 230 #endif
 231 #ifndef OPENSSL_NO_DH
 232         const DH_METHOD *meth3;
 233 #endif
 234
 235         if(!ENGINE_set_id(e, engine_sureware_id) ||
 236            !ENGINE_set_name(e, engine_sureware_name) ||
 237 #ifndef OPENSSL_NO_RSA
 238            !ENGINE_set_RSA(e, &surewarehk_rsa) ||
 239 #endif
 240 #ifndef OPENSSL_NO_DSA
 241            !ENGINE_set_DSA(e, &surewarehk_dsa) ||
 242 #endif
 243 #ifndef OPENSSL_NO_DH
 244            !ENGINE_set_DH(e, &surewarehk_dh) ||
 245 #endif
 246            !ENGINE_set_RAND(e, &surewarehk_rand) ||
 247            !ENGINE_set_destroy_function(e, surewarehk_destroy) ||
 248            !ENGINE_set_init_function(e, surewarehk_init) ||
 249            !ENGINE_set_finish_function(e, surewarehk_finish) ||
 250            !ENGINE_set_ctrl_function(e, surewarehk_ctrl) ||
 251            !ENGINE_set_load_privkey_function(e, surewarehk_load_privkey) ||
 252            !ENGINE_set_load_pubkey_function(e, surewarehk_load_pubkey))
 253           return 0;
 254
 255 #ifndef OPENSSL_NO_RSA
 256         /* We know that the "PKCS1_SSLeay()" functions hook properly
 257          * to the cswift-specific mod_exp and mod_exp_crt so we use
 258          * those functions. NB: We don't use ENGINE_openssl() or
 259          * anything "more generic" because something like the RSAref
 260          * code may not hook properly, and if you own one of these
 261          * cards then you have the right to do RSA operations on it
 262          * anyway! */
 263         meth1 = RSA_PKCS1_SSLeay();
 264         if (meth1)
 265         {
 266                 surewarehk_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 267                 surewarehk_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 268         }
 269 #endif
 270
 271 #ifndef OPENSSL_NO_DSA
 272         /* Use the DSA_OpenSSL() method and just hook the mod_exp-ish
 273          * bits. */
 274         meth2 = DSA_OpenSSL();
 275         if (meth2)
 276         {
 277                 surewarehk_dsa.dsa_do_verify = meth2->dsa_do_verify;
 278         }
 279 #endif
 280
 281 #ifndef OPENSSL_NO_DH
 282         /* Much the same for Diffie-Hellman */
 283         meth3 = DH_OpenSSL();
 284         if (meth3)
 285         {
 286                 surewarehk_dh.generate_key = meth3->generate_key;
 287                 surewarehk_dh.compute_key = meth3->compute_key;
 288         }
 289 #endif
 290
 291         /* Ensure the sureware error handling is set up */
 292         ERR_load_SUREWARE_strings();
 293         return 1;
 294 }
 295
 296 #ifndef OPENSSL_NO_DYNAMIC_ENGINE
 297 static int bind_helper(ENGINE *e, const char *id)
 298         {
 299         if(id && (strcmp(id, engine_sureware_id) != 0))
 300                 return 0;
 301         if(!bind_sureware(e))
 302                 return 0;
 303         return 1;
 304         }
 305 IMPLEMENT_DYNAMIC_CHECK_FN()
 306 IMPLEMENT_DYNAMIC_BIND_FN(bind_helper)
 307 #else
 308 static ENGINE *engine_sureware(void)
 309         {
 310         ENGINE *ret = ENGINE_new();
 311         if(!ret)
 312                 return NULL;
 313         if(!bind_sureware(ret))
 314                 {
 315                 ENGINE_free(ret);
 316                 return NULL;
 317                 }
 318         return ret;
 319         }
 320
 321 void ENGINE_load_sureware(void)
 322         {
 323         /* Copied from eng_[openssl|dyn].c */
 324         ENGINE *toadd = engine_sureware();
 325         if(!toadd) return;
 326         ENGINE_add(toadd);
 327         ENGINE_free(toadd);
 328         ERR_clear_error();
 329         }
 330 #endif
 331
 332 /* This is a process-global DSO handle used for loading and unloading
 333  * the SureWareHook library. NB: This is only set (or unset) during an
 334  * init() or finish() call (reference counts permitting) and they're
 335  * operating with global locks, so this should be thread-safe
 336  * implicitly. */
 337 static DSO *surewarehk_dso = NULL;
 338 #ifndef OPENSSL_NO_RSA
 339 static int rsaHndidx = -1;      /* Index for KM handle.  Not really used yet. */
 340 #endif
 341 #ifndef OPENSSL_NO_DSA
 342 static int dsaHndidx = -1;      /* Index for KM handle.  Not really used yet. */
 343 #endif
 344
 345 /* These are the function pointers that are (un)set when the library has
 346  * successfully (un)loaded. */
 347 static SureWareHook_Init_t *p_surewarehk_Init = NULL;
 348 static SureWareHook_Finish_t *p_surewarehk_Finish = NULL;
 349 static SureWareHook_Rand_Bytes_t *p_surewarehk_Rand_Bytes = NULL;
 350 static SureWareHook_Rand_Seed_t *p_surewarehk_Rand_Seed = NULL;
 351 static SureWareHook_Load_Privkey_t *p_surewarehk_Load_Privkey = NULL;
 352 static SureWareHook_Info_Pubkey_t *p_surewarehk_Info_Pubkey = NULL;
 353 static SureWareHook_Load_Rsa_Pubkey_t *p_surewarehk_Load_Rsa_Pubkey = NULL;
 354 static SureWareHook_Load_Dsa_Pubkey_t *p_surewarehk_Load_Dsa_Pubkey = NULL;
 355 static SureWareHook_Free_t *p_surewarehk_Free=NULL;
 356 static SureWareHook_Rsa_Priv_Dec_t *p_surewarehk_Rsa_Priv_Dec=NULL;
 357 static SureWareHook_Rsa_Sign_t *p_surewarehk_Rsa_Sign=NULL;
 358 static SureWareHook_Dsa_Sign_t *p_surewarehk_Dsa_Sign=NULL;
 359 static SureWareHook_Mod_Exp_t *p_surewarehk_Mod_Exp=NULL;
 360
 361 /* Used in the DSO operations. */
 362 static const char *surewarehk_LIBNAME = "SureWareHook";
 363 static const char *n_surewarehk_Init = "SureWareHook_Init";
 364 static const char *n_surewarehk_Finish = "SureWareHook_Finish";
 365 static const char *n_surewarehk_Rand_Bytes="SureWareHook_Rand_Bytes";
 366 static const char *n_surewarehk_Rand_Seed="SureWareHook_Rand_Seed";
 367 static const char *n_surewarehk_Load_Privkey="SureWareHook_Load_Privkey";
 368 static const char *n_surewarehk_Info_Pubkey="SureWareHook_Info_Pubkey";
 369 static const char *n_surewarehk_Load_Rsa_Pubkey="SureWareHook_Load_Rsa_Pubkey";
 370 static const char *n_surewarehk_Load_Dsa_Pubkey="SureWareHook_Load_Dsa_Pubkey";
 371 static const char *n_surewarehk_Free="SureWareHook_Free";
 372 static const char *n_surewarehk_Rsa_Priv_Dec="SureWareHook_Rsa_Priv_Dec";
 373 static const char *n_surewarehk_Rsa_Sign="SureWareHook_Rsa_Sign";
 374 static const char *n_surewarehk_Dsa_Sign="SureWareHook_Dsa_Sign";
 375 static const char *n_surewarehk_Mod_Exp="SureWareHook_Mod_Exp";
 376 static BIO *logstream = NULL;
 377
 378 /* SureWareHook library functions and mechanics - these are used by the
 379  * higher-level functions further down. NB: As and where there's no
 380  * error checking, take a look lower down where these functions are
 381  * called, the checking and error handling is probably down there.
 382 */
 383 static int threadsafe=1;
 384 static int surewarehk_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
 385 {
 386         int to_return = 1;
 387
 388         switch(cmd)
 389         {
 390                 case ENGINE_CTRL_SET_LOGSTREAM:
 391                 {
 392                         BIO *bio = (BIO *)p;
 393                         CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 394                         if (logstream)
 395                         {
 396                                 BIO_free(logstream);
 397                                 logstream = NULL;
 398                         }
 399                         if (CRYPTO_add(&bio->references,1,CRYPTO_LOCK_BIO) > 1)
 400                                 logstream = bio;
 401                         else
 402                                 SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,SUREWARE_R_BIO_WAS_FREED);
 403                 }
 404                 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 405                 break;
 406         /* This will prevent the initialisation function from "installing"
 407          * the mutex-handling callbacks, even if they are available from
 408          * within the library (or were provided to the library from the
 409          * calling application). This is to remove any baggage for
 410          * applications not using multithreading. */
 411         case ENGINE_CTRL_CHIL_NO_LOCKING:
 412                 CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
 413                 threadsafe = 0;
 414                 CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
 415                 break;
 416
 417         /* The command isn't understood by this engine */
 418         default:
 419                 SUREWAREerr(SUREWARE_F_SUREWAREHK_CTRL,
 420                         ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 421                 to_return = 0;
 422                 break;
 423                 }
 424
 425         return to_return;
 426 }
 427
 428 /* Destructor (complements the "ENGINE_surewarehk()" constructor) */
 429 static int surewarehk_destroy(ENGINE *e)
 430 {
 431         ERR_unload_SUREWARE_strings();
 432         return 1;
 433 }
 434
 435 /* (de)initialisation functions. */
 436 static int surewarehk_init(ENGINE *e)
 437 {
 438         char msg[64]="ENGINE_init";
 439         SureWareHook_Init_t *p1=NULL;
 440         SureWareHook_Finish_t *p2=NULL;
 441         SureWareHook_Rand_Bytes_t *p3=NULL;
 442         SureWareHook_Rand_Seed_t *p4=NULL;
 443         SureWareHook_Load_Privkey_t *p5=NULL;
 444         SureWareHook_Load_Rsa_Pubkey_t *p6=NULL;
 445         SureWareHook_Free_t *p7=NULL;
 446         SureWareHook_Rsa_Priv_Dec_t *p8=NULL;
 447         SureWareHook_Rsa_Sign_t *p9=NULL;
 448         SureWareHook_Dsa_Sign_t *p12=NULL;
 449         SureWareHook_Info_Pubkey_t *p13=NULL;
 450         SureWareHook_Load_Dsa_Pubkey_t *p14=NULL;
 451         SureWareHook_Mod_Exp_t *p15=NULL;
 452
 453         if(surewarehk_dso != NULL)
 454         {
 455                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_ALREADY_LOADED);
 456                 goto err;
 457         }
 458         /* Attempt to load libsurewarehk.so/surewarehk.dll/whatever. */
 459         surewarehk_dso = DSO_load(NULL, surewarehk_LIBNAME, NULL, 0);
 460         if(surewarehk_dso == NULL)
 461         {
 462                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_DSO_FAILURE);
 463                 goto err;
 464         }
 465         if(!(p1=(SureWareHook_Init_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Init)) ||
 466            !(p2=(SureWareHook_Finish_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Finish)) ||
 467            !(p3=(SureWareHook_Rand_Bytes_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rand_Bytes)) ||
 468            !(p4=(SureWareHook_Rand_Seed_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rand_Seed)) ||
 469            !(p5=(SureWareHook_Load_Privkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Privkey)) ||
 470            !(p6=(SureWareHook_Load_Rsa_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Rsa_Pubkey)) ||
 471            !(p7=(SureWareHook_Free_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Free)) ||
 472            !(p8=(SureWareHook_Rsa_Priv_Dec_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rsa_Priv_Dec)) ||
 473            !(p9=(SureWareHook_Rsa_Sign_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Rsa_Sign)) ||
 474            !(p12=(SureWareHook_Dsa_Sign_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Dsa_Sign)) ||
 475            !(p13=(SureWareHook_Info_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Info_Pubkey)) ||
 476            !(p14=(SureWareHook_Load_Dsa_Pubkey_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Load_Dsa_Pubkey)) ||
 477            !(p15=(SureWareHook_Mod_Exp_t*)DSO_bind_func(surewarehk_dso, n_surewarehk_Mod_Exp)))
 478         {
 479                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,ENGINE_R_DSO_FAILURE);
 480                 goto err;
 481         }
 482         /* Copy the pointers */
 483         p_surewarehk_Init = p1;
 484         p_surewarehk_Finish = p2;
 485         p_surewarehk_Rand_Bytes = p3;
 486         p_surewarehk_Rand_Seed = p4;
 487         p_surewarehk_Load_Privkey = p5;
 488         p_surewarehk_Load_Rsa_Pubkey = p6;
 489         p_surewarehk_Free = p7;
 490         p_surewarehk_Rsa_Priv_Dec = p8;
 491         p_surewarehk_Rsa_Sign = p9;
 492         p_surewarehk_Dsa_Sign = p12;
 493         p_surewarehk_Info_Pubkey = p13;
 494         p_surewarehk_Load_Dsa_Pubkey = p14;
 495         p_surewarehk_Mod_Exp = p15;
 496         /* Contact the hardware and initialises it. */
 497         if(p_surewarehk_Init(msg,threadsafe)==SUREWAREHOOK_ERROR_UNIT_FAILURE)
 498         {
 499                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,SUREWARE_R_UNIT_FAILURE);
 500                 goto err;
 501         }
 502         if(p_surewarehk_Init(msg,threadsafe)==SUREWAREHOOK_ERROR_UNIT_FAILURE)
 503         {
 504                 SUREWAREerr(SUREWARE_F_SUREWAREHK_INIT,SUREWARE_R_UNIT_FAILURE);
 505                 goto err;
 506         }
 507         /* try to load the default private key, if failed does not return a failure but
 508            wait for an explicit ENGINE_load_privakey */
 509         surewarehk_load_privkey(e,NULL,NULL,NULL);
 510
 511         /* Everything's fine. */
 512 #ifndef OPENSSL_NO_RSA
 513         if (rsaHndidx == -1)
 514                 rsaHndidx = RSA_get_ex_new_index(0,
 515                                                 "SureWareHook RSA key handle",
 516                                                 NULL, NULL, surewarehk_ex_free);
 517 #endif
 518 #ifndef OPENSSL_NO_DSA
 519         if (dsaHndidx == -1)
 520                 dsaHndidx = DSA_get_ex_new_index(0,
 521                                                 "SureWareHook DSA key handle",
 522                                                 NULL, NULL, surewarehk_ex_free);
 523 #endif
 524
 525         return 1;
 526 err:
 527         if(surewarehk_dso)
 528                 DSO_free(surewarehk_dso);
 529         surewarehk_dso = NULL;
 530         p_surewarehk_Init = NULL;
 531         p_surewarehk_Finish = NULL;
 532         p_surewarehk_Rand_Bytes = NULL;
 533         p_surewarehk_Rand_Seed = NULL;
 534         p_surewarehk_Load_Privkey = NULL;
 535         p_surewarehk_Load_Rsa_Pubkey = NULL;
 536         p_surewarehk_Free = NULL;
 537         p_surewarehk_Rsa_Priv_Dec = NULL;
 538         p_surewarehk_Rsa_Sign = NULL;
 539         p_surewarehk_Dsa_Sign = NULL;
 540         p_surewarehk_Info_Pubkey = NULL;
 541         p_surewarehk_Load_Dsa_Pubkey = NULL;
 542         p_surewarehk_Mod_Exp = NULL;
 543         return 0;
 544 }
 545
 546 static int surewarehk_finish(ENGINE *e)
 547 {
 548         int to_return = 1;
 549         if(surewarehk_dso == NULL)
 550                 {
 551                 SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH,ENGINE_R_NOT_LOADED);
 552                 to_return = 0;
 553                 goto err;
 554                 }
 555         p_surewarehk_Finish();
 556         if(!DSO_free(surewarehk_dso))
 557                 {
 558                 SUREWAREerr(SUREWARE_F_SUREWAREHK_FINISH,ENGINE_R_DSO_FAILURE);
 559                 to_return = 0;
 560                 goto err;
 561                 }
 562  err:
 563         if (logstream)
 564                 BIO_free(logstream);
 565         surewarehk_dso = NULL;
 566         p_surewarehk_Init = NULL;
 567         p_surewarehk_Finish = NULL;
 568         p_surewarehk_Rand_Bytes = NULL;
 569         p_surewarehk_Rand_Seed = NULL;
 570         p_surewarehk_Load_Privkey = NULL;
 571         p_surewarehk_Load_Rsa_Pubkey = NULL;
 572         p_surewarehk_Free = NULL;
 573         p_surewarehk_Rsa_Priv_Dec = NULL;
 574         p_surewarehk_Rsa_Sign = NULL;
 575         p_surewarehk_Dsa_Sign = NULL;
 576         p_surewarehk_Info_Pubkey = NULL;
 577         p_surewarehk_Load_Dsa_Pubkey = NULL;
 578         p_surewarehk_Mod_Exp = NULL;
 579         return to_return;
 580 }
 581
 582 static void surewarehk_error_handling(char *const msg,int func,int ret)
 583 {
 584         switch (ret)
 585         {
 586                 case SUREWAREHOOK_ERROR_UNIT_FAILURE:
 587                         ENGINEerr(func,SUREWARE_R_UNIT_FAILURE);
 588                         break;
 589                 case SUREWAREHOOK_ERROR_FALLBACK:
 590                         ENGINEerr(func,SUREWARE_R_REQUEST_FALLBACK);
 591                         break;
 592                 case SUREWAREHOOK_ERROR_DATA_SIZE:
 593                         ENGINEerr(func,SUREWARE_R_SIZE_TOO_LARGE_OR_TOO_SMALL);
 594                         break;
 595                 case SUREWAREHOOK_ERROR_INVALID_PAD:
 596                         ENGINEerr(func,SUREWARE_R_PADDING_CHECK_FAILED);
 597                         break;
 598                 default:
 599                         ENGINEerr(func,SUREWARE_R_REQUEST_FAILED);
 600                         break;
 601                 case 1:/*nothing*/
 602                         msg[0]='\0';
 603         }
 604         if (*msg)
 605         {
 606                 ERR_add_error_data(1,msg);
 607                 if (logstream)
 608                 {
 609                         CRYPTO_w_lock(CRYPTO_LOCK_BIO);
 610                         BIO_write(logstream, msg, strlen(msg));
 611                         CRYPTO_w_unlock(CRYPTO_LOCK_BIO);
 612                 }
 613         }
 614 }
 615
 616 static int surewarehk_rand_bytes(unsigned char *buf, int num)
 617 {
 618         int ret=0;
 619         char msg[64]="ENGINE_rand_bytes";
 620         if(!p_surewarehk_Rand_Bytes)
 621         {
 622                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_BYTES,ENGINE_R_NOT_INITIALISED);
 623         }
 624         else
 625         {
 626                 ret = p_surewarehk_Rand_Bytes(msg,buf, num);
 627                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RAND_BYTES,ret);
 628         }
 629         return ret==1 ? 1 : 0;
 630 }
 631
 632 static int surewarehk_rand_seed(const void *buf, int num)
 633 {
 634         int ret=0;
 635         char msg[64]="ENGINE_rand_seed";
 636         if(!p_surewarehk_Rand_Seed)
 637         {
 638                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RAND_SEED,ENGINE_R_NOT_INITIALISED);
 639                 return 0;
 640         }
 641         else
 642         {
 643                 ret = p_surewarehk_Rand_Seed(msg,buf, num);
 644                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RAND_SEED,ret);
 645                 if (ret == 1)
 646                         return 1;
 647                 else
 648                         return 0;
 649         }
 650 }
 651
 652 static int surewarehk_rand_add(const void *buf, int num, double entropy)
 653 {
 654         return surewarehk_rand_seed(buf,num);
 655 }
 656
 657 static EVP_PKEY* sureware_load_public(ENGINE *e,const char *key_id,char *hptr,unsigned long el,char keytype)
 658 {
 659         EVP_PKEY *res = NULL;
 660 #ifndef OPENSSL_NO_RSA
 661         RSA *rsatmp = NULL;
 662 #endif
 663 #ifndef OPENSSL_NO_DSA
 664         DSA *dsatmp=NULL;
 665 #endif
 666         char msg[64]="sureware_load_public";
 667         int ret=0;
 668         if(!p_surewarehk_Load_Rsa_Pubkey || !p_surewarehk_Load_Dsa_Pubkey)
 669         {
 670                 SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_NOT_INITIALISED);
 671                 goto err;
 672         }
 673         switch (keytype)
 674         {
 675 #ifndef OPENSSL_NO_RSA
 676         case 1: /*RSA*/
 677                 /* set private external reference */
 678                 rsatmp = RSA_new_method(e);
 679                 RSA_set_ex_data(rsatmp,rsaHndidx,hptr);
 680                 rsatmp->flags |= RSA_FLAG_EXT_PKEY;
 681
 682                 /* set public big nums*/
 683                 rsatmp->e = BN_new();
 684                 rsatmp->n = BN_new();
 685                 bn_expand2(rsatmp->e, el/sizeof(BN_ULONG));
 686                 bn_expand2(rsatmp->n, el/sizeof(BN_ULONG));
 687                 if (!rsatmp->e || rsatmp->e->dmax!=(int)(el/sizeof(BN_ULONG))||
 688                         !rsatmp->n || rsatmp->n->dmax!=(int)(el/sizeof(BN_ULONG)))
 689                         goto err;
 690                 ret=p_surewarehk_Load_Rsa_Pubkey(msg,key_id,el,
 691                                                  (unsigned long *)rsatmp->n->d,
 692                                                  (unsigned long *)rsatmp->e->d);
 693                 surewarehk_error_handling(msg,SUREWARE_F_SUREWARE_LOAD_PUBLIC,ret);
 694                 if (ret!=1)
 695                 {
 696                         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 697                         goto err;
 698                 }
 699                 /* normalise pub e and pub n */
 700                 rsatmp->e->top=el/sizeof(BN_ULONG);
 701                 bn_fix_top(rsatmp->e);
 702                 rsatmp->n->top=el/sizeof(BN_ULONG);
 703                 bn_fix_top(rsatmp->n);
 704                 /* create an EVP object: engine + rsa key */
 705                 res = EVP_PKEY_new();
 706                 EVP_PKEY_assign_RSA(res, rsatmp);
 707                 break;
 708 #endif
 709
 710 #ifndef OPENSSL_NO_DSA
 711         case 2:/*DSA*/
 712                 /* set private/public external reference */
 713                 dsatmp = DSA_new_method(e);
 714                 DSA_set_ex_data(dsatmp,dsaHndidx,hptr);
 715                 /*dsatmp->flags |= DSA_FLAG_EXT_PKEY;*/
 716
 717                 /* set public key*/
 718                 dsatmp->pub_key = BN_new();
 719                 dsatmp->p = BN_new();
 720                 dsatmp->q = BN_new();
 721                 dsatmp->g = BN_new();
 722                 bn_expand2(dsatmp->pub_key, el/sizeof(BN_ULONG));
 723                 bn_expand2(dsatmp->p, el/sizeof(BN_ULONG));
 724                 bn_expand2(dsatmp->q, 20/sizeof(BN_ULONG));
 725                 bn_expand2(dsatmp->g, el/sizeof(BN_ULONG));
 726                 if (!dsatmp->pub_key || dsatmp->pub_key->dmax!=(int)(el/sizeof(BN_ULONG))||
 727                         !dsatmp->p || dsatmp->p->dmax!=(int)(el/sizeof(BN_ULONG)) ||
 728                         !dsatmp->q || dsatmp->q->dmax!=20/sizeof(BN_ULONG) ||
 729                         !dsatmp->g || dsatmp->g->dmax!=(int)(el/sizeof(BN_ULONG)))
 730                         goto err;
 731
 732                 ret=p_surewarehk_Load_Dsa_Pubkey(msg,key_id,el,
 733                                                  (unsigned long *)dsatmp->pub_key->d,
 734                                                  (unsigned long *)dsatmp->p->d,
 735                                                  (unsigned long *)dsatmp->q->d,
 736                                                  (unsigned long *)dsatmp->g->d);
 737                 surewarehk_error_handling(msg,SUREWARE_F_SUREWARE_LOAD_PUBLIC,ret);
 738                 if (ret!=1)
 739                 {
 740                         SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 741                         goto err;
 742                 }
 743                 /* set parameters */
 744                 /* normalise pubkey and parameters in case of */
 745                 dsatmp->pub_key->top=el/sizeof(BN_ULONG);
 746                 bn_fix_top(dsatmp->pub_key);
 747                 dsatmp->p->top=el/sizeof(BN_ULONG);
 748                 bn_fix_top(dsatmp->p);
 749                 dsatmp->q->top=20/sizeof(BN_ULONG);
 750                 bn_fix_top(dsatmp->q);
 751                 dsatmp->g->top=el/sizeof(BN_ULONG);
 752                 bn_fix_top(dsatmp->g);
 753
 754                 /* create an EVP object: engine + rsa key */
 755                 res = EVP_PKEY_new();
 756                 EVP_PKEY_assign_DSA(res, dsatmp);
 757                 break;
 758 #endif
 759
 760         default:
 761                 SUREWAREerr(SUREWARE_F_SUREWARE_LOAD_PUBLIC,ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 762                 goto err;
 763         }
 764         return res;
 765  err:
 766 #ifndef OPENSSL_NO_RSA
 767         if (rsatmp)
 768                 RSA_free(rsatmp);
 769 #endif
 770 #ifndef OPENSSL_NO_DSA
 771         if (dsatmp)
 772                 DSA_free(dsatmp);
 773 #endif
 774         return NULL;
 775 }
 776
 777 static EVP_PKEY *surewarehk_load_privkey(ENGINE *e, const char *key_id,
 778                                          UI_METHOD *ui_method, void *callback_data)
 779 {
 780         EVP_PKEY *res = NULL;
 781         int ret=0;
 782         unsigned long el=0;
 783         char *hptr=NULL;
 784         char keytype=0;
 785         char msg[64]="ENGINE_load_privkey";
 786
 787         if(!p_surewarehk_Load_Privkey)
 788         {
 789                 SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,ENGINE_R_NOT_INITIALISED);
 790         }
 791         else
 792         {
 793                 ret=p_surewarehk_Load_Privkey(msg,key_id,&hptr,&el,&keytype);
 794                 if (ret!=1)
 795                 {
 796                         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PRIVKEY,ENGINE_R_FAILED_LOADING_PRIVATE_KEY);
 797                         ERR_add_error_data(1,msg);
 798                 }
 799                 else
 800                         res=sureware_load_public(e,key_id,hptr,el,keytype);
 801         }
 802         return res;
 803 }
 804
 805 static EVP_PKEY *surewarehk_load_pubkey(ENGINE *e, const char *key_id,
 806                                          UI_METHOD *ui_method, void *callback_data)
 807 {
 808         EVP_PKEY *res = NULL;
 809         int ret=0;
 810         unsigned long el=0;
 811         char *hptr=NULL;
 812         char keytype=0;
 813         char msg[64]="ENGINE_load_pubkey";
 814
 815         if(!p_surewarehk_Info_Pubkey)
 816         {
 817                 SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,ENGINE_R_NOT_INITIALISED);
 818         }
 819         else
 820         {
 821                 /* call once to identify if DSA or RSA */
 822                 ret=p_surewarehk_Info_Pubkey(msg,key_id,&el,&keytype);
 823                 if (ret!=1)
 824                 {
 825                         SUREWAREerr(SUREWARE_F_SUREWAREHK_LOAD_PUBKEY,ENGINE_R_FAILED_LOADING_PUBLIC_KEY);
 826                         ERR_add_error_data(1,msg);
 827                 }
 828                 else
 829                         res=sureware_load_public(e,key_id,hptr,el,keytype);
 830         }
 831         return res;
 832 }
 833
 834 /* This cleans up an RSA/DSA KM key(do not destroy the key into the hardware)
 835 , called when ex_data is freed */
 836 static void surewarehk_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 837         int idx,long argl, void *argp)
 838 {
 839         if(!p_surewarehk_Free)
 840         {
 841                 SUREWAREerr(SUREWARE_F_SUREWAREHK_EX_FREE,ENGINE_R_NOT_INITIALISED);
 842         }
 843         else
 844                 p_surewarehk_Free((char *)item,0);
 845 }
 846
 847 #if 0
 848 /* not currently used (bug?) */
 849 /* This cleans up an DH KM key (destroys the key into hardware),
 850 called when ex_data is freed */
 851 static void surewarehk_dh_ex_free(void *obj, void *item, CRYPTO_EX_DATA *ad,
 852         int idx,long argl, void *argp)
 853 {
 854         if(!p_surewarehk_Free)
 855         {
 856                 SUREWAREerr(SUREWARE_F_SUREWAREHK_DH_EX_FREE,ENGINE_R_NOT_INITIALISED);
 857         }
 858         else
 859                 p_surewarehk_Free((char *)item,1);
 860 }
 861 #endif
 862
 863 /*
 864 * return number of decrypted bytes
 865 */
 866 #ifndef OPENSSL_NO_RSA
 867 static int surewarehk_rsa_priv_dec(int flen,const unsigned char *from,unsigned char *to,
 868                         RSA *rsa,int padding)
 869 {
 870         int ret=0,tlen;
 871         char *buf=NULL,*hptr=NULL;
 872         char msg[64]="ENGINE_rsa_priv_dec";
 873         if (!p_surewarehk_Rsa_Priv_Dec)
 874         {
 875                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ENGINE_R_NOT_INITIALISED);
 876         }
 877         /* extract ref to private key */
 878         else if (!(hptr=RSA_get_ex_data(rsa, rsaHndidx)))
 879         {
 880                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,SUREWARE_R_MISSING_KEY_COMPONENTS);
 881                 goto err;
 882         }
 883         /* analyse what padding we can do into the hardware */
 884         if (padding==RSA_PKCS1_PADDING)
 885         {
 886                 /* do it one shot */
 887                 ret=p_surewarehk_Rsa_Priv_Dec(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_PKCS1_PAD);
 888                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ret);
 889                 if (ret!=1)
 890                         goto err;
 891                 ret=tlen;
 892         }
 893         else /* do with no padding into hardware */
 894         {
 895                 ret=p_surewarehk_Rsa_Priv_Dec(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_NO_PAD);
 896                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ret);
 897                 if (ret!=1)
 898                         goto err;
 899                 /* intermediate buffer for padding */
 900                 if ((buf=OPENSSL_malloc(tlen)) == NULL)
 901                 {
 902                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,ERR_R_MALLOC_FAILURE);
 903                         goto err;
 904                 }
 905                 memcpy(buf,to,tlen);/* transfert to into buf */
 906                 switch (padding) /* check padding in software */
 907                 {
 908 #ifndef OPENSSL_NO_SHA
 909                 case RSA_PKCS1_OAEP_PADDING:
 910                         ret=RSA_padding_check_PKCS1_OAEP(to,tlen,(unsigned char *)buf,tlen,tlen,NULL,0);
 911                         break;
 912 #endif
 913                 case RSA_SSLV23_PADDING:
 914                         ret=RSA_padding_check_SSLv23(to,tlen,(unsigned char *)buf,flen,tlen);
 915                         break;
 916                 case RSA_NO_PADDING:
 917                         ret=RSA_padding_check_none(to,tlen,(unsigned char *)buf,flen,tlen);
 918                         break;
 919                 default:
 920                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,SUREWARE_R_UNKNOWN_PADDING_TYPE);
 921                         goto err;
 922                 }
 923                 if (ret < 0)
 924                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_PRIV_DEC,SUREWARE_R_PADDING_CHECK_FAILED);
 925         }
 926 err:
 927         if (buf)
 928         {
 929                 OPENSSL_cleanse(buf,tlen);
 930                 OPENSSL_free(buf);
 931         }
 932         return ret;
 933 }
 934
 935 /*
 936 * Does what OpenSSL rsa_priv_enc does.
 937 */
 938 static int surewarehk_rsa_sign(int flen,const unsigned char *from,unsigned char *to,
 939                             RSA *rsa,int padding)
 940 {
 941         int ret=0,tlen;
 942         char *hptr=NULL;
 943         char msg[64]="ENGINE_rsa_sign";
 944         if (!p_surewarehk_Rsa_Sign)
 945         {
 946                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,ENGINE_R_NOT_INITIALISED);
 947         }
 948         /* extract ref to private key */
 949         else if (!(hptr=RSA_get_ex_data(rsa, rsaHndidx)))
 950         {
 951                 SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,SUREWARE_R_MISSING_KEY_COMPONENTS);
 952         }
 953         else
 954         {
 955                 switch (padding)
 956                 {
 957                 case RSA_PKCS1_PADDING: /* do it in one shot */
 958                         ret=p_surewarehk_Rsa_Sign(msg,flen,(unsigned char *)from,&tlen,to,hptr,SUREWARE_PKCS1_PAD);
 959                         surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_RSA_SIGN,ret);
 960                         break;
 961                 case RSA_NO_PADDING:
 962                 default:
 963                         SUREWAREerr(SUREWARE_F_SUREWAREHK_RSA_SIGN,SUREWARE_R_UNKNOWN_PADDING_TYPE);
 964                 }
 965         }
 966         return ret==1 ? tlen : ret;
 967 }
 968
 969 #endif
 970
 971 #ifndef OPENSSL_NO_DSA
 972 /* DSA sign and verify */
 973 static  DSA_SIG * surewarehk_dsa_do_sign(const unsigned char *from, int flen, DSA *dsa)
 974 {
 975         int ret=0;
 976         char *hptr=NULL;
 977         DSA_SIG *psign=NULL;
 978         char msg[64]="ENGINE_dsa_do_sign";
 979         if (!p_surewarehk_Dsa_Sign)
 980         {
 981                 SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ENGINE_R_NOT_INITIALISED);
 982                 goto err;
 983         }
 984         /* extract ref to private key */
 985         else if (!(hptr=DSA_get_ex_data(dsa, dsaHndidx)))
 986         {
 987                 SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,SUREWARE_R_MISSING_KEY_COMPONENTS);
 988                 goto err;
 989         }
 990         else
 991         {
 992                 if((psign = DSA_SIG_new()) == NULL)
 993                 {
 994                         SUREWAREerr(SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ERR_R_MALLOC_FAILURE);
 995                         goto err;
 996                 }
 997                 psign->r=BN_new();
 998                 psign->s=BN_new();
 999                 bn_expand2(psign->r, 20/sizeof(BN_ULONG));
1000                 bn_expand2(psign->s, 20/sizeof(BN_ULONG));
1001                 if (!psign->r || psign->r->dmax!=20/sizeof(BN_ULONG) ||
1002                         !psign->s || psign->s->dmax!=20/sizeof(BN_ULONG))
1003                         goto err;
1004                 ret=p_surewarehk_Dsa_Sign(msg,flen,from,
1005                                           (unsigned long *)psign->r->d,
1006                                           (unsigned long *)psign->s->d,
1007                                           hptr);
1008                 surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_DSA_DO_SIGN,ret);
1009         }
1010         psign->r->top=20/sizeof(BN_ULONG);
1011         bn_fix_top(psign->r);
1012         psign->s->top=20/sizeof(BN_ULONG);
1013         bn_fix_top(psign->s);
1014
1015 err:
1016         if (psign)
1017         {
1018                 DSA_SIG_free(psign);
1019                 psign=NULL;
1020         }
1021         return psign;
1022 }
1023 #endif
1024
1025 static int surewarehk_modexp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
1026                              const BIGNUM *m, BN_CTX *ctx)
1027 {
1028         int ret=0;
1029         char msg[64]="ENGINE_modexp";
1030         if (!p_surewarehk_Mod_Exp)
1031         {
1032                 SUREWAREerr(SUREWARE_F_SUREWAREHK_MODEXP,ENGINE_R_NOT_INITIALISED);
1033         }
1034         else
1035         {
1036                 bn_expand2(r,m->top);
1037                 if (r && r->dmax==m->top)
1038                 {
1039                         /* do it*/
1040                         ret=p_surewarehk_Mod_Exp(msg,
1041                                                  m->top*sizeof(BN_ULONG),
1042                                                  (unsigned long *)m->d,
1043                                                  p->top*sizeof(BN_ULONG),
1044                                                  (unsigned long *)p->d,
1045                                                  a->top*sizeof(BN_ULONG),
1046                                                  (unsigned long *)a->d,
1047                                                  (unsigned long *)r->d);
1048                         surewarehk_error_handling(msg,SUREWARE_F_SUREWAREHK_MODEXP,ret);
1049                         if (ret==1)
1050                         {
1051                                 /* normalise result */
1052                                 r->top=m->top;
1053                                 bn_fix_top(r);
1054                         }
1055                 }
1056         }
1057         return ret;
1058 }
1059 #endif /* !OPENSSL_NO_HW_SureWare */
1060 #endif /* !OPENSSL_NO_HW */