engines/e_atalla.c

   1 /* crypto/engine/hw_atalla.c */
   2 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include <openssl/crypto.h>
  61 #include "cryptlib.h"
  62 #include <openssl/dso.h>
  63 #include <openssl/engine.h>
  64
  65 #ifndef OPENSSL_NO_HW
  66 #ifndef OPENSSL_NO_HW_ATALLA
  67
  68 #ifdef FLAT_INC
  69 #include "atalla.h"
  70 #else
  71 #include "vendor_defns/atalla.h"
  72 #endif
  73
  74 #define ATALLA_LIB_NAME "atalla engine"
  75 #include "hw_atalla_err.c"
  76
  77 static int atalla_destroy(ENGINE *e);
  78 static int atalla_init(ENGINE *e);
  79 static int atalla_finish(ENGINE *e);
  80 static int atalla_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)());
  81
  82 /* BIGNUM stuff */
  83 static int atalla_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  84                 const BIGNUM *m, BN_CTX *ctx);
  85
  86 #ifndef OPENSSL_NO_RSA
  87 /* RSA stuff */
  88 static int atalla_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa);
  89 #endif
  90 /* This function is aliased to mod_exp (with the mont stuff dropped). */
  91 static int atalla_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  92                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
  93
  94 #ifndef OPENSSL_NO_DSA
  95 /* DSA stuff */
  96 static int atalla_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
  97                 BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
  98                 BN_CTX *ctx, BN_MONT_CTX *in_mont);
  99 static int atalla_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
 100                 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
 101                 BN_MONT_CTX *m_ctx);
 102 #endif
 103
 104 #ifndef OPENSSL_NO_DH
 105 /* DH stuff */
 106 /* This function is alised to mod_exp (with the DH and mont dropped). */
 107 static int atalla_mod_exp_dh(const DH *dh, BIGNUM *r,
 108                 const BIGNUM *a, const BIGNUM *p,
 109                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
 110 #endif
 111
 112 /* The definitions for control commands specific to this engine */
 113 #define ATALLA_CMD_SO_PATH              ENGINE_CMD_BASE
 114 static const ENGINE_CMD_DEFN atalla_cmd_defns[] = {
 115         {ATALLA_CMD_SO_PATH,
 116                 "SO_PATH",
 117                 "Specifies the path to the 'atasi' shared library",
 118                 ENGINE_CMD_FLAG_STRING},
 119         {0, NULL, NULL, 0}
 120         };
 121
 122 #ifndef OPENSSL_NO_RSA
 123 /* Our internal RSA_METHOD that we provide pointers to */
 124 static RSA_METHOD atalla_rsa =
 125         {
 126         "Atalla RSA method",
 127         NULL,
 128         NULL,
 129         NULL,
 130         NULL,
 131         atalla_rsa_mod_exp,
 132         atalla_mod_exp_mont,
 133         NULL,
 134         NULL,
 135         0,
 136         NULL,
 137         NULL,
 138         NULL
 139         };
 140 #endif
 141
 142 #ifndef OPENSSL_NO_DSA
 143 /* Our internal DSA_METHOD that we provide pointers to */
 144 static DSA_METHOD atalla_dsa =
 145         {
 146         "Atalla DSA method",
 147         NULL, /* dsa_do_sign */
 148         NULL, /* dsa_sign_setup */
 149         NULL, /* dsa_do_verify */
 150         atalla_dsa_mod_exp, /* dsa_mod_exp */
 151         atalla_mod_exp_dsa, /* bn_mod_exp */
 152         NULL, /* init */
 153         NULL, /* finish */
 154         0, /* flags */
 155         NULL /* app_data */
 156         };
 157 #endif
 158
 159 #ifndef OPENSSL_NO_DH
 160 /* Our internal DH_METHOD that we provide pointers to */
 161 static DH_METHOD atalla_dh =
 162         {
 163         "Atalla DH method",
 164         NULL,
 165         NULL,
 166         atalla_mod_exp_dh,
 167         NULL,
 168         NULL,
 169         0,
 170         NULL
 171         };
 172 #endif
 173
 174 /* Constants used when creating the ENGINE */
 175 static const char *engine_atalla_id = "atalla";
 176 static const char *engine_atalla_name = "Atalla hardware engine support";
 177
 178 /* This internal function is used by ENGINE_atalla() and possibly by the
 179  * "dynamic" ENGINE support too */
 180 static int bind_helper(ENGINE *e)
 181         {
 182 #ifndef OPENSSL_NO_RSA
 183         const RSA_METHOD *meth1;
 184 #endif
 185 #ifndef OPENSSL_NO_DSA
 186         const DSA_METHOD *meth2;
 187 #endif
 188 #ifndef OPENSSL_NO_DH
 189         const DH_METHOD *meth3;
 190 #endif
 191         if(!ENGINE_set_id(e, engine_atalla_id) ||
 192                         !ENGINE_set_name(e, engine_atalla_name) ||
 193 #ifndef OPENSSL_NO_RSA
 194                         !ENGINE_set_RSA(e, &atalla_rsa) ||
 195 #endif
 196 #ifndef OPENSSL_NO_DSA
 197                         !ENGINE_set_DSA(e, &atalla_dsa) ||
 198 #endif
 199 #ifndef OPENSSL_NO_DH
 200                         !ENGINE_set_DH(e, &atalla_dh) ||
 201 #endif
 202                         !ENGINE_set_destroy_function(e, atalla_destroy) ||
 203                         !ENGINE_set_init_function(e, atalla_init) ||
 204                         !ENGINE_set_finish_function(e, atalla_finish) ||
 205                         !ENGINE_set_ctrl_function(e, atalla_ctrl) ||
 206                         !ENGINE_set_cmd_defns(e, atalla_cmd_defns))
 207                 return 0;
 208
 209 #ifndef OPENSSL_NO_RSA
 210         /* We know that the "PKCS1_SSLeay()" functions hook properly
 211          * to the atalla-specific mod_exp and mod_exp_crt so we use
 212          * those functions. NB: We don't use ENGINE_openssl() or
 213          * anything "more generic" because something like the RSAref
 214          * code may not hook properly, and if you own one of these
 215          * cards then you have the right to do RSA operations on it
 216          * anyway! */
 217         meth1 = RSA_PKCS1_SSLeay();
 218         atalla_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 219         atalla_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 220         atalla_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
 221         atalla_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
 222 #endif
 223
 224 #ifndef OPENSSL_NO_DSA
 225         /* Use the DSA_OpenSSL() method and just hook the mod_exp-ish
 226          * bits. */
 227         meth2 = DSA_OpenSSL();
 228         atalla_dsa.dsa_do_sign = meth2->dsa_do_sign;
 229         atalla_dsa.dsa_sign_setup = meth2->dsa_sign_setup;
 230         atalla_dsa.dsa_do_verify = meth2->dsa_do_verify;
 231 #endif
 232
 233 #ifndef OPENSSL_NO_DH
 234         /* Much the same for Diffie-Hellman */
 235         meth3 = DH_OpenSSL();
 236         atalla_dh.generate_key = meth3->generate_key;
 237         atalla_dh.compute_key = meth3->compute_key;
 238 #endif
 239
 240         /* Ensure the atalla error handling is set up */
 241         ERR_load_ATALLA_strings();
 242         return 1;
 243         }
 244
 245 static ENGINE *engine_atalla(void)
 246         {
 247         ENGINE *ret = ENGINE_new();
 248         if(!ret)
 249                 return NULL;
 250         if(!bind_helper(ret))
 251                 {
 252                 ENGINE_free(ret);
 253                 return NULL;
 254                 }
 255         return ret;
 256         }
 257
 258 void ENGINE_load_atalla(void)
 259         {
 260         /* Copied from eng_[openssl|dyn].c */
 261         ENGINE *toadd = engine_atalla();
 262         if(!toadd) return;
 263         ENGINE_add(toadd);
 264         ENGINE_free(toadd);
 265         ERR_clear_error();
 266         }
 267
 268 /* This is a process-global DSO handle used for loading and unloading
 269  * the Atalla library. NB: This is only set (or unset) during an
 270  * init() or finish() call (reference counts permitting) and they're
 271  * operating with global locks, so this should be thread-safe
 272  * implicitly. */
 273 static DSO *atalla_dso = NULL;
 274
 275 /* These are the function pointers that are (un)set when the library has
 276  * successfully (un)loaded. */
 277 static tfnASI_GetHardwareConfig *p_Atalla_GetHardwareConfig = NULL;
 278 static tfnASI_RSAPrivateKeyOpFn *p_Atalla_RSAPrivateKeyOpFn = NULL;
 279 static tfnASI_GetPerformanceStatistics *p_Atalla_GetPerformanceStatistics = NULL;
 280
 281 /* These are the static string constants for the DSO file name and the function
 282  * symbol names to bind to. Regrettably, the DSO name on *nix appears to be
 283  * "atasi.so" rather than something more consistent like "libatasi.so". At the
 284  * time of writing, I'm not sure what the file name on win32 is but clearly
 285  * native name translation is not possible (eg libatasi.so on *nix, and
 286  * atasi.dll on win32). For the purposes of testing, I have created a symbollic
 287  * link called "libatasi.so" so that we can use native name-translation - a
 288  * better solution will be needed. */
 289 static const char *ATALLA_LIBNAME = NULL;
 290 static const char *get_ATALLA_LIBNAME(void)
 291         {
 292                 if(ATALLA_LIBNAME)
 293                         return ATALLA_LIBNAME;
 294                 return "atasi";
 295         }
 296 static void free_ATALLA_LIBNAME(void)
 297         {
 298                 if(ATALLA_LIBNAME)
 299                         OPENSSL_free((void*)ATALLA_LIBNAME);
 300                 ATALLA_LIBNAME = NULL;
 301         }
 302 static long set_ATALLA_LIBNAME(const char *name)
 303         {
 304         free_ATALLA_LIBNAME();
 305         return (((ATALLA_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
 306         }
 307 static const char *ATALLA_F1 = "ASI_GetHardwareConfig";
 308 static const char *ATALLA_F2 = "ASI_RSAPrivateKeyOpFn";
 309 static const char *ATALLA_F3 = "ASI_GetPerformanceStatistics";
 310
 311 /* Destructor (complements the "ENGINE_atalla()" constructor) */
 312 static int atalla_destroy(ENGINE *e)
 313         {
 314         free_ATALLA_LIBNAME();
 315         /* Unload the atalla error strings so any error state including our
 316          * functs or reasons won't lead to a segfault (they simply get displayed
 317          * without corresponding string data because none will be found). */
 318         ERR_unload_ATALLA_strings();
 319         return 1;
 320         }
 321
 322 /* (de)initialisation functions. */
 323 static int atalla_init(ENGINE *e)
 324         {
 325         tfnASI_GetHardwareConfig *p1;
 326         tfnASI_RSAPrivateKeyOpFn *p2;
 327         tfnASI_GetPerformanceStatistics *p3;
 328         /* Not sure of the origin of this magic value, but Ben's code had it
 329          * and it seemed to have been working for a few people. :-) */
 330         unsigned int config_buf[1024];
 331
 332         if(atalla_dso != NULL)
 333                 {
 334                 ATALLAerr(ATALLA_F_ATALLA_INIT,ATALLA_R_ALREADY_LOADED);
 335                 goto err;
 336                 }
 337         /* Attempt to load libatasi.so/atasi.dll/whatever. Needs to be
 338          * changed unfortunately because the Atalla drivers don't have
 339          * standard library names that can be platform-translated well. */
 340         /* TODO: Work out how to actually map to the names the Atalla
 341          * drivers really use - for now a symbollic link needs to be
 342          * created on the host system from libatasi.so to atasi.so on
 343          * unix variants. */
 344         atalla_dso = DSO_load(NULL, get_ATALLA_LIBNAME(), NULL, 0);
 345         if(atalla_dso == NULL)
 346                 {
 347                 ATALLAerr(ATALLA_F_ATALLA_INIT,ATALLA_R_NOT_LOADED);
 348                 goto err;
 349                 }
 350         if(!(p1 = (tfnASI_GetHardwareConfig *)DSO_bind_func(
 351                                 atalla_dso, ATALLA_F1)) ||
 352                         !(p2 = (tfnASI_RSAPrivateKeyOpFn *)DSO_bind_func(
 353                                 atalla_dso, ATALLA_F2)) ||
 354                         !(p3 = (tfnASI_GetPerformanceStatistics *)DSO_bind_func(
 355                                 atalla_dso, ATALLA_F3)))
 356                 {
 357                 ATALLAerr(ATALLA_F_ATALLA_INIT,ATALLA_R_NOT_LOADED);
 358                 goto err;
 359                 }
 360         /* Copy the pointers */
 361         p_Atalla_GetHardwareConfig = p1;
 362         p_Atalla_RSAPrivateKeyOpFn = p2;
 363         p_Atalla_GetPerformanceStatistics = p3;
 364         /* Perform a basic test to see if there's actually any unit
 365          * running. */
 366         if(p1(0L, config_buf) != 0)
 367                 {
 368                 ATALLAerr(ATALLA_F_ATALLA_INIT,ATALLA_R_UNIT_FAILURE);
 369                 goto err;
 370                 }
 371         /* Everything's fine. */
 372         return 1;
 373 err:
 374         if(atalla_dso)
 375                 DSO_free(atalla_dso);
 376         p_Atalla_GetHardwareConfig = NULL;
 377         p_Atalla_RSAPrivateKeyOpFn = NULL;
 378         p_Atalla_GetPerformanceStatistics = NULL;
 379         return 0;
 380         }
 381
 382 static int atalla_finish(ENGINE *e)
 383         {
 384         free_ATALLA_LIBNAME();
 385         if(atalla_dso == NULL)
 386                 {
 387                 ATALLAerr(ATALLA_F_ATALLA_FINISH,ATALLA_R_NOT_LOADED);
 388                 return 0;
 389                 }
 390         if(!DSO_free(atalla_dso))
 391                 {
 392                 ATALLAerr(ATALLA_F_ATALLA_FINISH,ATALLA_R_UNIT_FAILURE);
 393                 return 0;
 394                 }
 395         atalla_dso = NULL;
 396         p_Atalla_GetHardwareConfig = NULL;
 397         p_Atalla_RSAPrivateKeyOpFn = NULL;
 398         p_Atalla_GetPerformanceStatistics = NULL;
 399         return 1;
 400         }
 401
 402 static int atalla_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)())
 403         {
 404         int initialised = ((atalla_dso == NULL) ? 0 : 1);
 405         switch(cmd)
 406                 {
 407         case ATALLA_CMD_SO_PATH:
 408                 if(p == NULL)
 409                         {
 410                         ATALLAerr(ATALLA_F_ATALLA_CTRL,ERR_R_PASSED_NULL_PARAMETER);
 411                         return 0;
 412                         }
 413                 if(initialised)
 414                         {
 415                         ATALLAerr(ATALLA_F_ATALLA_CTRL,ATALLA_R_ALREADY_LOADED);
 416                         return 0;
 417                         }
 418                 return set_ATALLA_LIBNAME((const char *)p);
 419         default:
 420                 break;
 421                 }
 422         ATALLAerr(ATALLA_F_ATALLA_CTRL,ATALLA_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 423         return 0;
 424         }
 425
 426 static int atalla_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 427                         const BIGNUM *m, BN_CTX *ctx)
 428         {
 429         /* I need somewhere to store temporary serialised values for
 430          * use with the Atalla API calls. A neat cheat - I'll use
 431          * BIGNUMs from the BN_CTX but access their arrays directly as
 432          * byte arrays <grin>. This way I don't have to clean anything
 433          * up. */
 434         BIGNUM *modulus;
 435         BIGNUM *exponent;
 436         BIGNUM *argument;
 437         BIGNUM *result;
 438         RSAPrivateKey keydata;
 439         int to_return, numbytes;
 440
 441         modulus = exponent = argument = result = NULL;
 442         to_return = 0; /* expect failure */
 443
 444         if(!atalla_dso)
 445                 {
 446                 ATALLAerr(ATALLA_F_ATALLA_MOD_EXP,ATALLA_R_NOT_LOADED);
 447                 goto err;
 448                 }
 449         /* Prepare the params */
 450         BN_CTX_start(ctx);
 451         modulus = BN_CTX_get(ctx);
 452         exponent = BN_CTX_get(ctx);
 453         argument = BN_CTX_get(ctx);
 454         result = BN_CTX_get(ctx);
 455         if (!result)
 456                 {
 457                 ATALLAerr(ATALLA_F_ATALLA_MOD_EXP,ATALLA_R_BN_CTX_FULL);
 458                 goto err;
 459                 }
 460         if(!bn_wexpand(modulus, m->top) || !bn_wexpand(exponent, m->top) ||
 461            !bn_wexpand(argument, m->top) || !bn_wexpand(result, m->top))
 462                 {
 463                 ATALLAerr(ATALLA_F_ATALLA_MOD_EXP,ATALLA_R_BN_EXPAND_FAIL);
 464                 goto err;
 465                 }
 466         /* Prepare the key-data */
 467         memset(&keydata, 0,sizeof keydata);
 468         numbytes = BN_num_bytes(m);
 469         memset(exponent->d, 0, numbytes);
 470         memset(modulus->d, 0, numbytes);
 471         BN_bn2bin(p, (unsigned char *)exponent->d + numbytes - BN_num_bytes(p));
 472         BN_bn2bin(m, (unsigned char *)modulus->d + numbytes - BN_num_bytes(m));
 473         keydata.privateExponent.data = (unsigned char *)exponent->d;
 474         keydata.privateExponent.len = numbytes;
 475         keydata.modulus.data = (unsigned char *)modulus->d;
 476         keydata.modulus.len = numbytes;
 477         /* Prepare the argument */
 478         memset(argument->d, 0, numbytes);
 479         memset(result->d, 0, numbytes);
 480         BN_bn2bin(a, (unsigned char *)argument->d + numbytes - BN_num_bytes(a));
 481         /* Perform the operation */
 482         if(p_Atalla_RSAPrivateKeyOpFn(&keydata, (unsigned char *)result->d,
 483                         (unsigned char *)argument->d,
 484                         keydata.modulus.len) != 0)
 485                 {
 486                 ATALLAerr(ATALLA_F_ATALLA_MOD_EXP,ATALLA_R_REQUEST_FAILED);
 487                 goto err;
 488                 }
 489         /* Convert the response */
 490         BN_bin2bn((unsigned char *)result->d, numbytes, r);
 491         to_return = 1;
 492 err:
 493         BN_CTX_end(ctx);
 494         return to_return;
 495         }
 496
 497 #ifndef OPENSSL_NO_RSA
 498 static int atalla_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
 499         {
 500         BN_CTX *ctx = NULL;
 501         int to_return = 0;
 502
 503         if(!atalla_dso)
 504                 {
 505                 ATALLAerr(ATALLA_F_ATALLA_RSA_MOD_EXP,ATALLA_R_NOT_LOADED);
 506                 goto err;
 507                 }
 508         if((ctx = BN_CTX_new()) == NULL)
 509                 goto err;
 510         if(!rsa->d || !rsa->n)
 511                 {
 512                 ATALLAerr(ATALLA_F_ATALLA_RSA_MOD_EXP,ATALLA_R_MISSING_KEY_COMPONENTS);
 513                 goto err;
 514                 }
 515         to_return = atalla_mod_exp(r0, I, rsa->d, rsa->n, ctx);
 516 err:
 517         if(ctx)
 518                 BN_CTX_free(ctx);
 519         return to_return;
 520         }
 521 #endif
 522
 523 #ifndef OPENSSL_NO_DSA
 524 /* This code was liberated and adapted from the commented-out code in
 525  * dsa_ossl.c. Because of the unoptimised form of the Atalla acceleration
 526  * (it doesn't have a CRT form for RSA), this function means that an
 527  * Atalla system running with a DSA server certificate can handshake
 528  * around 5 or 6 times faster/more than an equivalent system running with
 529  * RSA. Just check out the "signs" statistics from the RSA and DSA parts
 530  * of "openssl speed -engine atalla dsa1024 rsa1024". */
 531 static int atalla_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
 532                 BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
 533                 BN_CTX *ctx, BN_MONT_CTX *in_mont)
 534         {
 535         BIGNUM t;
 536         int to_return = 0;
 537
 538         BN_init(&t);
 539         /* let rr = a1 ^ p1 mod m */
 540         if (!atalla_mod_exp(rr,a1,p1,m,ctx)) goto end;
 541         /* let t = a2 ^ p2 mod m */
 542         if (!atalla_mod_exp(&t,a2,p2,m,ctx)) goto end;
 543         /* let rr = rr * t mod m */
 544         if (!BN_mod_mul(rr,rr,&t,m,ctx)) goto end;
 545         to_return = 1;
 546 end:
 547         BN_free(&t);
 548         return to_return;
 549         }
 550
 551 static int atalla_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
 552                 const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
 553                 BN_MONT_CTX *m_ctx)
 554         {
 555         return atalla_mod_exp(r, a, p, m, ctx);
 556         }
 557 #endif
 558
 559 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 560 static int atalla_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 561                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 562         {
 563         return atalla_mod_exp(r, a, p, m, ctx);
 564         }
 565
 566 #ifndef OPENSSL_NO_DH
 567 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 568 static int atalla_mod_exp_dh(const DH *dh, BIGNUM *r,
 569                 const BIGNUM *a, const BIGNUM *p,
 570                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 571         {
 572         return atalla_mod_exp(r, a, p, m, ctx);
 573         }
 574 #endif
 575
 576 /* This stuff is needed if this ENGINE is being compiled into a self-contained
 577  * shared-library. */
 578 #ifndef OPENSSL_NO_DYNAMIC_ENGINE
 579 static int bind_fn(ENGINE *e, const char *id)
 580         {
 581         if(id && (strcmp(id, engine_atalla_id) != 0))
 582                 return 0;
 583         if(!bind_helper(e))
 584                 return 0;
 585         return 1;
 586         }
 587 IMPLEMENT_DYNAMIC_CHECK_FN()
 588 IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
 589 #endif /* OPENSSL_NO_DYNAMIC_ENGINE */
 590
 591 #endif /* !OPENSSL_NO_HW_ATALLA */
 592 #endif /* !OPENSSL_NO_HW */