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