engines/e_atalla.c

   1 /* crypto/engine/hw_atalla.c */
   2 /*
   3  * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
   4  * 2000.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include <string.h>
  62 #include <openssl/crypto.h>
  63 #include <openssl/buffer.h>
  64 #include <openssl/dso.h>
  65 #include <openssl/engine.h>
  66 #ifndef OPENSSL_NO_RSA
  67 # include <openssl/rsa.h>
  68 #endif
  69 #ifndef OPENSSL_NO_DSA
  70 # include <openssl/dsa.h>
  71 #endif
  72 #ifndef OPENSSL_NO_DH
  73 # include <openssl/dh.h>
  74 #endif
  75 #include <openssl/bn.h>
  76
  77 #ifndef OPENSSL_NO_HW
  78 # ifndef OPENSSL_NO_HW_ATALLA
  79
  80 #  ifdef FLAT_INC
  81 #   include "atalla.h"
  82 #  else
  83 #   include "vendor_defns/atalla.h"
  84 #  endif
  85
  86 #  define ATALLA_LIB_NAME "atalla engine"
  87 #  include "e_atalla_err.c"
  88
  89 static int atalla_destroy(ENGINE *e);
  90 static int atalla_init(ENGINE *e);
  91 static int atalla_finish(ENGINE *e);
  92 static int atalla_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void));
  93
  94 /* BIGNUM stuff */
  95 static int atalla_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  96                           const BIGNUM *m, BN_CTX *ctx);
  97
  98 #  ifndef OPENSSL_NO_RSA
  99 /* RSA stuff */
 100 static int atalla_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
 101                               BN_CTX *ctx);
 102 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 103 static int atalla_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 104                                const BIGNUM *m, BN_CTX *ctx,
 105                                BN_MONT_CTX *m_ctx);
 106 #  endif
 107
 108 #  ifndef OPENSSL_NO_DSA
 109 /* DSA stuff */
 110 static int atalla_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
 111                               BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
 112                               BN_CTX *ctx, BN_MONT_CTX *in_mont);
 113 static int atalla_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
 114                               const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
 115                               BN_MONT_CTX *m_ctx);
 116 #  endif
 117
 118 #  ifndef OPENSSL_NO_DH
 119 /* DH stuff */
 120 /* This function is alised to mod_exp (with the DH and mont dropped). */
 121 static int atalla_mod_exp_dh(const DH *dh, BIGNUM *r,
 122                              const BIGNUM *a, const BIGNUM *p,
 123                              const BIGNUM *m, BN_CTX *ctx,
 124                              BN_MONT_CTX *m_ctx);
 125 #  endif
 126
 127 /* The definitions for control commands specific to this engine */
 128 #  define ATALLA_CMD_SO_PATH              ENGINE_CMD_BASE
 129 static const ENGINE_CMD_DEFN atalla_cmd_defns[] = {
 130     {ATALLA_CMD_SO_PATH,
 131      "SO_PATH",
 132      "Specifies the path to the 'atasi' shared library",
 133      ENGINE_CMD_FLAG_STRING},
 134     {0, NULL, NULL, 0}
 135 };
 136
 137 #  ifndef OPENSSL_NO_RSA
 138 /* Our internal RSA_METHOD that we provide pointers to */
 139 static RSA_METHOD atalla_rsa = {
 140     "Atalla RSA method",
 141     NULL,
 142     NULL,
 143     NULL,
 144     NULL,
 145     atalla_rsa_mod_exp,
 146     atalla_mod_exp_mont,
 147     NULL,
 148     NULL,
 149     0,
 150     NULL,
 151     NULL,
 152     NULL,
 153     NULL
 154 };
 155 #  endif
 156
 157 #  ifndef OPENSSL_NO_DSA
 158 /* Our internal DSA_METHOD that we provide pointers to */
 159 static DSA_METHOD atalla_dsa = {
 160     "Atalla DSA method",
 161     NULL,                       /* dsa_do_sign */
 162     NULL,                       /* dsa_sign_setup */
 163     NULL,                       /* dsa_do_verify */
 164     atalla_dsa_mod_exp,         /* dsa_mod_exp */
 165     atalla_mod_exp_dsa,         /* bn_mod_exp */
 166     NULL,                       /* init */
 167     NULL,                       /* finish */
 168     0,                          /* flags */
 169     NULL,                       /* app_data */
 170     NULL,                       /* dsa_paramgen */
 171     NULL                        /* dsa_keygen */
 172 };
 173 #  endif
 174
 175 #  ifndef OPENSSL_NO_DH
 176 /* Our internal DH_METHOD that we provide pointers to */
 177 static DH_METHOD atalla_dh = {
 178     "Atalla DH method",
 179     NULL,
 180     NULL,
 181     atalla_mod_exp_dh,
 182     NULL,
 183     NULL,
 184     0,
 185     NULL,
 186     NULL
 187 };
 188 #  endif
 189
 190 /* Constants used when creating the ENGINE */
 191 static const char *engine_atalla_id = "atalla";
 192 static const char *engine_atalla_name = "Atalla hardware engine support";
 193
 194 /*
 195  * This internal function is used by ENGINE_atalla() and possibly by the
 196  * "dynamic" ENGINE support too
 197  */
 198 static int bind_helper(ENGINE *e)
 199 {
 200 #  ifndef OPENSSL_NO_RSA
 201     const RSA_METHOD *meth1;
 202 #  endif
 203 #  ifndef OPENSSL_NO_DSA
 204     const DSA_METHOD *meth2;
 205 #  endif
 206 #  ifndef OPENSSL_NO_DH
 207     const DH_METHOD *meth3;
 208 #  endif
 209     if (!ENGINE_set_id(e, engine_atalla_id) ||
 210         !ENGINE_set_name(e, engine_atalla_name) ||
 211 #  ifndef OPENSSL_NO_RSA
 212         !ENGINE_set_RSA(e, &atalla_rsa) ||
 213 #  endif
 214 #  ifndef OPENSSL_NO_DSA
 215         !ENGINE_set_DSA(e, &atalla_dsa) ||
 216 #  endif
 217 #  ifndef OPENSSL_NO_DH
 218         !ENGINE_set_DH(e, &atalla_dh) ||
 219 #  endif
 220         !ENGINE_set_destroy_function(e, atalla_destroy) ||
 221         !ENGINE_set_init_function(e, atalla_init) ||
 222         !ENGINE_set_finish_function(e, atalla_finish) ||
 223         !ENGINE_set_ctrl_function(e, atalla_ctrl) ||
 224         !ENGINE_set_cmd_defns(e, atalla_cmd_defns))
 225         return 0;
 226
 227 #  ifndef OPENSSL_NO_RSA
 228     /*
 229      * We know that the "PKCS1_SSLeay()" functions hook properly to the
 230      * atalla-specific mod_exp and mod_exp_crt so we use those functions. NB:
 231      * We don't use ENGINE_openssl() or anything "more generic" because
 232      * something like the RSAref code may not hook properly, and if you own
 233      * one of these cards then you have the right to do RSA operations on it
 234      * anyway!
 235      */
 236     meth1 = RSA_PKCS1_SSLeay();
 237     atalla_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 238     atalla_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 239     atalla_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
 240     atalla_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
 241 #  endif
 242
 243 #  ifndef OPENSSL_NO_DSA
 244     /*
 245      * Use the DSA_OpenSSL() method and just hook the mod_exp-ish bits.
 246      */
 247     meth2 = DSA_OpenSSL();
 248     atalla_dsa.dsa_do_sign = meth2->dsa_do_sign;
 249     atalla_dsa.dsa_sign_setup = meth2->dsa_sign_setup;
 250     atalla_dsa.dsa_do_verify = meth2->dsa_do_verify;
 251 #  endif
 252
 253 #  ifndef OPENSSL_NO_DH
 254     /* Much the same for Diffie-Hellman */
 255     meth3 = DH_OpenSSL();
 256     atalla_dh.generate_key = meth3->generate_key;
 257     atalla_dh.compute_key = meth3->compute_key;
 258 #  endif
 259
 260     /* Ensure the atalla error handling is set up */
 261     ERR_load_ATALLA_strings();
 262     return 1;
 263 }
 264
 265 #  ifdef OPENSSL_NO_DYNAMIC_ENGINE
 266 static ENGINE *engine_atalla(void)
 267 {
 268     ENGINE *ret = ENGINE_new();
 269     if (!ret)
 270         return NULL;
 271     if (!bind_helper(ret)) {
 272         ENGINE_free(ret);
 273         return NULL;
 274     }
 275     return ret;
 276 }
 277
 278 void ENGINE_load_atalla(void)
 279 {
 280     /* Copied from eng_[openssl|dyn].c */
 281     ENGINE *toadd = engine_atalla();
 282     if (!toadd)
 283         return;
 284     ENGINE_add(toadd);
 285     ENGINE_free(toadd);
 286     ERR_clear_error();
 287 }
 288 #  endif
 289
 290 /*
 291  * This is a process-global DSO handle used for loading and unloading the
 292  * Atalla library. NB: This is only set (or unset) during an init() or
 293  * finish() call (reference counts permitting) and they're operating with
 294  * global locks, so this should be thread-safe implicitly.
 295  */
 296 static DSO *atalla_dso = NULL;
 297
 298 /*
 299  * These are the function pointers that are (un)set when the library has
 300  * successfully (un)loaded.
 301  */
 302 static tfnASI_GetHardwareConfig *p_Atalla_GetHardwareConfig = NULL;
 303 static tfnASI_RSAPrivateKeyOpFn *p_Atalla_RSAPrivateKeyOpFn = NULL;
 304 static tfnASI_GetPerformanceStatistics *p_Atalla_GetPerformanceStatistics =
 305     NULL;
 306
 307 /*
 308  * These are the static string constants for the DSO file name and the
 309  * function symbol names to bind to. Regrettably, the DSO name on *nix
 310  * appears to be "atasi.so" rather than something more consistent like
 311  * "libatasi.so". At the time of writing, I'm not sure what the file name on
 312  * win32 is but clearly native name translation is not possible (eg
 313  * libatasi.so on *nix, and atasi.dll on win32). For the purposes of testing,
 314  * I have created a symbollic link called "libatasi.so" so that we can use
 315  * native name-translation - a better solution will be needed.
 316  */
 317 static const char *ATALLA_LIBNAME = NULL;
 318 static const char *get_ATALLA_LIBNAME(void)
 319 {
 320     if (ATALLA_LIBNAME)
 321         return ATALLA_LIBNAME;
 322     return "atasi";
 323 }
 324
 325 static void free_ATALLA_LIBNAME(void)
 326 {
 327     if (ATALLA_LIBNAME)
 328         OPENSSL_free((void *)ATALLA_LIBNAME);
 329     ATALLA_LIBNAME = NULL;
 330 }
 331
 332 static long set_ATALLA_LIBNAME(const char *name)
 333 {
 334     free_ATALLA_LIBNAME();
 335     return (((ATALLA_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
 336 }
 337
 338 static const char *ATALLA_F1 = "ASI_GetHardwareConfig";
 339 static const char *ATALLA_F2 = "ASI_RSAPrivateKeyOpFn";
 340 static const char *ATALLA_F3 = "ASI_GetPerformanceStatistics";
 341
 342 /* Destructor (complements the "ENGINE_atalla()" constructor) */
 343 static int atalla_destroy(ENGINE *e)
 344 {
 345     free_ATALLA_LIBNAME();
 346     /*
 347      * Unload the atalla error strings so any error state including our
 348      * functs or reasons won't lead to a segfault (they simply get displayed
 349      * without corresponding string data because none will be found).
 350      */
 351     ERR_unload_ATALLA_strings();
 352     return 1;
 353 }
 354
 355 /* (de)initialisation functions. */
 356 static int atalla_init(ENGINE *e)
 357 {
 358     tfnASI_GetHardwareConfig *p1;
 359     tfnASI_RSAPrivateKeyOpFn *p2;
 360     tfnASI_GetPerformanceStatistics *p3;
 361     /*
 362      * Not sure of the origin of this magic value, but Ben's code had it and
 363      * it seemed to have been working for a few people. :-)
 364      */
 365     unsigned int config_buf[1024];
 366
 367     if (atalla_dso != NULL) {
 368         ATALLAerr(ATALLA_F_ATALLA_INIT, ATALLA_R_ALREADY_LOADED);
 369         goto err;
 370     }
 371     /*
 372      * Attempt to load libatasi.so/atasi.dll/whatever. Needs to be changed
 373      * unfortunately because the Atalla drivers don't have standard library
 374      * names that can be platform-translated well.
 375      */
 376     /*
 377      * TODO: Work out how to actually map to the names the Atalla drivers
 378      * really use - for now a symbollic link needs to be created on the host
 379      * system from libatasi.so to atasi.so on unix variants.
 380      */
 381     atalla_dso = DSO_load(NULL, get_ATALLA_LIBNAME(), NULL, 0);
 382     if (atalla_dso == NULL) {
 383         ATALLAerr(ATALLA_F_ATALLA_INIT, ATALLA_R_NOT_LOADED);
 384         goto err;
 385     }
 386     if (!
 387         (p1 =
 388          (tfnASI_GetHardwareConfig *) DSO_bind_func(atalla_dso, ATALLA_F1))
 389 || !(p2 = (tfnASI_RSAPrivateKeyOpFn *) DSO_bind_func(atalla_dso, ATALLA_F2))
 390 || !(p3 =
 391      (tfnASI_GetPerformanceStatistics *) DSO_bind_func(atalla_dso,
 392                                                        ATALLA_F3))) {
 393         ATALLAerr(ATALLA_F_ATALLA_INIT, ATALLA_R_NOT_LOADED);
 394         goto err;
 395     }
 396     /* Copy the pointers */
 397     p_Atalla_GetHardwareConfig = p1;
 398     p_Atalla_RSAPrivateKeyOpFn = p2;
 399     p_Atalla_GetPerformanceStatistics = p3;
 400     /*
 401      * Perform a basic test to see if there's actually any unit running.
 402      */
 403     if (p1(0L, config_buf) != 0) {
 404         ATALLAerr(ATALLA_F_ATALLA_INIT, ATALLA_R_UNIT_FAILURE);
 405         goto err;
 406     }
 407     /* Everything's fine. */
 408     return 1;
 409  err:
 410     if (atalla_dso)
 411         DSO_free(atalla_dso);
 412     atalla_dso = NULL;
 413     p_Atalla_GetHardwareConfig = NULL;
 414     p_Atalla_RSAPrivateKeyOpFn = NULL;
 415     p_Atalla_GetPerformanceStatistics = NULL;
 416     return 0;
 417 }
 418
 419 static int atalla_finish(ENGINE *e)
 420 {
 421     free_ATALLA_LIBNAME();
 422     if (atalla_dso == NULL) {
 423         ATALLAerr(ATALLA_F_ATALLA_FINISH, ATALLA_R_NOT_LOADED);
 424         return 0;
 425     }
 426     if (!DSO_free(atalla_dso)) {
 427         ATALLAerr(ATALLA_F_ATALLA_FINISH, ATALLA_R_UNIT_FAILURE);
 428         return 0;
 429     }
 430     atalla_dso = NULL;
 431     p_Atalla_GetHardwareConfig = NULL;
 432     p_Atalla_RSAPrivateKeyOpFn = NULL;
 433     p_Atalla_GetPerformanceStatistics = NULL;
 434     return 1;
 435 }
 436
 437 static int atalla_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void))
 438 {
 439     int initialised = ((atalla_dso == NULL) ? 0 : 1);
 440     switch (cmd) {
 441     case ATALLA_CMD_SO_PATH:
 442         if (p == NULL) {
 443             ATALLAerr(ATALLA_F_ATALLA_CTRL, ERR_R_PASSED_NULL_PARAMETER);
 444             return 0;
 445         }
 446         if (initialised) {
 447             ATALLAerr(ATALLA_F_ATALLA_CTRL, ATALLA_R_ALREADY_LOADED);
 448             return 0;
 449         }
 450         return set_ATALLA_LIBNAME((const char *)p);
 451     default:
 452         break;
 453     }
 454     ATALLAerr(ATALLA_F_ATALLA_CTRL, ATALLA_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 455     return 0;
 456 }
 457
 458 static int atalla_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 459                           const BIGNUM *m, BN_CTX *ctx)
 460 {
 461     /*
 462      * I need somewhere to store temporary serialised values for use with the
 463      * Atalla API calls. A neat cheat - I'll use BIGNUMs from the BN_CTX but
 464      * access their arrays directly as byte arrays <grin>. This way I don't
 465      * have to clean anything up.
 466      */
 467     BIGNUM *modulus;
 468     BIGNUM *exponent;
 469     BIGNUM *argument;
 470     BIGNUM *result;
 471     RSAPrivateKey keydata;
 472     int to_return, numbytes;
 473
 474     modulus = exponent = argument = result = NULL;
 475     to_return = 0;              /* expect failure */
 476
 477     if (!atalla_dso) {
 478         ATALLAerr(ATALLA_F_ATALLA_MOD_EXP, ATALLA_R_NOT_LOADED);
 479         goto err;
 480     }
 481     /* Prepare the params */
 482     BN_CTX_start(ctx);
 483     modulus = BN_CTX_get(ctx);
 484     exponent = BN_CTX_get(ctx);
 485     argument = BN_CTX_get(ctx);
 486     result = BN_CTX_get(ctx);
 487     if (!result) {
 488         ATALLAerr(ATALLA_F_ATALLA_MOD_EXP, ATALLA_R_BN_CTX_FULL);
 489         goto err;
 490     }
 491     if (!bn_wexpand(modulus, m->top) || !bn_wexpand(exponent, m->top) ||
 492         !bn_wexpand(argument, m->top) || !bn_wexpand(result, m->top)) {
 493         ATALLAerr(ATALLA_F_ATALLA_MOD_EXP, ATALLA_R_BN_EXPAND_FAIL);
 494         goto err;
 495     }
 496     /* Prepare the key-data */
 497     memset(&keydata, 0, sizeof keydata);
 498     numbytes = BN_num_bytes(m);
 499     memset(exponent->d, 0, numbytes);
 500     memset(modulus->d, 0, numbytes);
 501     BN_bn2bin(p, (unsigned char *)exponent->d + numbytes - BN_num_bytes(p));
 502     BN_bn2bin(m, (unsigned char *)modulus->d + numbytes - BN_num_bytes(m));
 503     keydata.privateExponent.data = (unsigned char *)exponent->d;
 504     keydata.privateExponent.len = numbytes;
 505     keydata.modulus.data = (unsigned char *)modulus->d;
 506     keydata.modulus.len = numbytes;
 507     /* Prepare the argument */
 508     memset(argument->d, 0, numbytes);
 509     memset(result->d, 0, numbytes);
 510     BN_bn2bin(a, (unsigned char *)argument->d + numbytes - BN_num_bytes(a));
 511     /* Perform the operation */
 512     if (p_Atalla_RSAPrivateKeyOpFn(&keydata, (unsigned char *)result->d,
 513                                    (unsigned char *)argument->d,
 514                                    keydata.modulus.len) != 0) {
 515         ATALLAerr(ATALLA_F_ATALLA_MOD_EXP, ATALLA_R_REQUEST_FAILED);
 516         goto err;
 517     }
 518     /* Convert the response */
 519     BN_bin2bn((unsigned char *)result->d, numbytes, r);
 520     to_return = 1;
 521  err:
 522     BN_CTX_end(ctx);
 523     return to_return;
 524 }
 525
 526 #  ifndef OPENSSL_NO_RSA
 527 static int atalla_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
 528                               BN_CTX *ctx)
 529 {
 530     int to_return = 0;
 531
 532     if (!atalla_dso) {
 533         ATALLAerr(ATALLA_F_ATALLA_RSA_MOD_EXP, ATALLA_R_NOT_LOADED);
 534         goto err;
 535     }
 536     if (!rsa->d || !rsa->n) {
 537         ATALLAerr(ATALLA_F_ATALLA_RSA_MOD_EXP,
 538                   ATALLA_R_MISSING_KEY_COMPONENTS);
 539         goto err;
 540     }
 541     to_return = atalla_mod_exp(r0, I, rsa->d, rsa->n, ctx);
 542  err:
 543     return to_return;
 544 }
 545 #  endif
 546
 547 #  ifndef OPENSSL_NO_DSA
 548 /*
 549  * This code was liberated and adapted from the commented-out code in
 550  * dsa_ossl.c. Because of the unoptimised form of the Atalla acceleration (it
 551  * doesn't have a CRT form for RSA), this function means that an Atalla
 552  * system running with a DSA server certificate can handshake around 5 or 6
 553  * times faster/more than an equivalent system running with RSA. Just check
 554  * out the "signs" statistics from the RSA and DSA parts of "openssl speed
 555  * -engine atalla dsa1024 rsa1024".
 556  */
 557 static int atalla_dsa_mod_exp(DSA *dsa, BIGNUM *rr, BIGNUM *a1,
 558                               BIGNUM *p1, BIGNUM *a2, BIGNUM *p2, BIGNUM *m,
 559                               BN_CTX *ctx, BN_MONT_CTX *in_mont)
 560 {
 561     BIGNUM t;
 562     int to_return = 0;
 563
 564     BN_init(&t);
 565     /* let rr = a1 ^ p1 mod m */
 566     if (!atalla_mod_exp(rr, a1, p1, m, ctx))
 567         goto end;
 568     /* let t = a2 ^ p2 mod m */
 569     if (!atalla_mod_exp(&t, a2, p2, m, ctx))
 570         goto end;
 571     /* let rr = rr * t mod m */
 572     if (!BN_mod_mul(rr, rr, &t, m, ctx))
 573         goto end;
 574     to_return = 1;
 575  end:
 576     BN_free(&t);
 577     return to_return;
 578 }
 579
 580 static int atalla_mod_exp_dsa(DSA *dsa, BIGNUM *r, BIGNUM *a,
 581                               const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
 582                               BN_MONT_CTX *m_ctx)
 583 {
 584     return atalla_mod_exp(r, a, p, m, ctx);
 585 }
 586 #  endif
 587
 588 #  ifndef OPENSSL_NO_RSA
 589 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 590 static int atalla_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 591                                const BIGNUM *m, BN_CTX *ctx,
 592                                BN_MONT_CTX *m_ctx)
 593 {
 594     return atalla_mod_exp(r, a, p, m, ctx);
 595 }
 596 #  endif
 597
 598 #  ifndef OPENSSL_NO_DH
 599 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 600 static int atalla_mod_exp_dh(const DH *dh, BIGNUM *r,
 601                              const BIGNUM *a, const BIGNUM *p,
 602                              const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 603 {
 604     return atalla_mod_exp(r, a, p, m, ctx);
 605 }
 606 #  endif
 607
 608 /*
 609  * This stuff is needed if this ENGINE is being compiled into a
 610  * self-contained shared-library.
 611  */
 612 #  ifndef OPENSSL_NO_DYNAMIC_ENGINE
 613 static int bind_fn(ENGINE *e, const char *id)
 614 {
 615     if (id && (strcmp(id, engine_atalla_id) != 0))
 616         return 0;
 617     if (!bind_helper(e))
 618         return 0;
 619     return 1;
 620 }
 621
 622 IMPLEMENT_DYNAMIC_CHECK_FN()
 623     IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
 624 #  endif                        /* OPENSSL_NO_DYNAMIC_ENGINE */
 625 # endif                         /* !OPENSSL_NO_HW_ATALLA */
 626 #endif                          /* !OPENSSL_NO_HW */