engines/e_cswift.c

   1 /* crypto/engine/hw_cswift.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 <string.h>
  61 #include <openssl/crypto.h>
  62 #include <openssl/buffer.h>
  63 #include <openssl/dso.h>
  64 #include <openssl/engine.h>
  65
  66 #ifndef OPENSSL_NO_HW
  67 #ifndef OPENSSL_NO_HW_CSWIFT
  68
  69 /* Attribution notice: Rainbow have generously allowed me to reproduce
  70  * the necessary definitions here from their API. This means the support
  71  * can build independently of whether application builders have the
  72  * API or hardware. This will allow developers to easily produce software
  73  * that has latent hardware support for any users that have accelerators
  74  * installed, without the developers themselves needing anything extra.
  75  *
  76  * I have only clipped the parts from the CryptoSwift header files that
  77  * are (or seem) relevant to the CryptoSwift support code. This is
  78  * simply to keep the file sizes reasonable.
  79  * [Geoff]
  80  */
  81 #ifdef FLAT_INC
  82 #include "cswift.h"
  83 #else
  84 #include "vendor_defns/cswift.h"
  85 #endif
  86
  87 #define CSWIFT_LIB_NAME "cswift engine"
  88 #include "e_cswift_err.c"
  89
  90 #define DECIMAL_SIZE(type)      ((sizeof(type)*8+2)/3+1)
  91
  92 static int cswift_destroy(ENGINE *e);
  93 static int cswift_init(ENGINE *e);
  94 static int cswift_finish(ENGINE *e);
  95 static int cswift_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)());
  96
  97 /* BIGNUM stuff */
  98 static int cswift_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
  99                 const BIGNUM *m, BN_CTX *ctx);
 100 static int cswift_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 101                 const BIGNUM *q, const BIGNUM *dmp1, const BIGNUM *dmq1,
 102                 const BIGNUM *iqmp, BN_CTX *ctx);
 103
 104 #ifndef OPENSSL_NO_RSA
 105 /* RSA stuff */
 106 static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa);
 107 #endif
 108 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 109 static int cswift_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 110                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
 111
 112 #ifndef OPENSSL_NO_DSA
 113 /* DSA stuff */
 114 static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa);
 115 static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
 116                                 DSA_SIG *sig, DSA *dsa);
 117 #endif
 118
 119 #ifndef OPENSSL_NO_DH
 120 /* DH stuff */
 121 /* This function is alised to mod_exp (with the DH and mont dropped). */
 122 static int cswift_mod_exp_dh(const DH *dh, BIGNUM *r,
 123                 const BIGNUM *a, const BIGNUM *p,
 124                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
 125 #endif
 126
 127 /* RAND stuff */
 128 static int cswift_rand_bytes(unsigned char *buf, int num);
 129 static int cswift_rand_status(void);
 130
 131 /* The definitions for control commands specific to this engine */
 132 #define CSWIFT_CMD_SO_PATH              ENGINE_CMD_BASE
 133 static const ENGINE_CMD_DEFN cswift_cmd_defns[] = {
 134         {CSWIFT_CMD_SO_PATH,
 135                 "SO_PATH",
 136                 "Specifies the path to the 'cswift' shared library",
 137                 ENGINE_CMD_FLAG_STRING},
 138         {0, NULL, NULL, 0}
 139         };
 140
 141 #ifndef OPENSSL_NO_RSA
 142 /* Our internal RSA_METHOD that we provide pointers to */
 143 static RSA_METHOD cswift_rsa =
 144         {
 145         "CryptoSwift RSA method",
 146         NULL,
 147         NULL,
 148         NULL,
 149         NULL,
 150         cswift_rsa_mod_exp,
 151         cswift_mod_exp_mont,
 152         NULL,
 153         NULL,
 154         0,
 155         NULL,
 156         NULL,
 157         NULL
 158         };
 159 #endif
 160
 161 #ifndef OPENSSL_NO_DSA
 162 /* Our internal DSA_METHOD that we provide pointers to */
 163 static DSA_METHOD cswift_dsa =
 164         {
 165         "CryptoSwift DSA method",
 166         cswift_dsa_sign,
 167         NULL, /* dsa_sign_setup */
 168         cswift_dsa_verify,
 169         NULL, /* dsa_mod_exp */
 170         NULL, /* bn_mod_exp */
 171         NULL, /* init */
 172         NULL, /* finish */
 173         0, /* flags */
 174         NULL /* app_data */
 175         };
 176 #endif
 177
 178 #ifndef OPENSSL_NO_DH
 179 /* Our internal DH_METHOD that we provide pointers to */
 180 static DH_METHOD cswift_dh =
 181         {
 182         "CryptoSwift DH method",
 183         NULL,
 184         NULL,
 185         cswift_mod_exp_dh,
 186         NULL,
 187         NULL,
 188         0,
 189         NULL
 190         };
 191 #endif
 192
 193 static RAND_METHOD cswift_random =
 194     {
 195     /* "CryptoSwift RAND method", */
 196     NULL,
 197     cswift_rand_bytes,
 198     NULL,
 199     NULL,
 200     cswift_rand_bytes,
 201     cswift_rand_status,
 202     };
 203
 204
 205 /* Constants used when creating the ENGINE */
 206 static const char *engine_cswift_id = "cswift";
 207 static const char *engine_cswift_name = "CryptoSwift hardware engine support";
 208
 209 /* This internal function is used by ENGINE_cswift() and possibly by the
 210  * "dynamic" ENGINE support too */
 211 static int bind_helper(ENGINE *e)
 212         {
 213 #ifndef OPENSSL_NO_RSA
 214         const RSA_METHOD *meth1;
 215 #endif
 216 #ifndef OPENSSL_NO_DH
 217         const DH_METHOD *meth2;
 218 #endif
 219         if(!ENGINE_set_id(e, engine_cswift_id) ||
 220                         !ENGINE_set_name(e, engine_cswift_name) ||
 221 #ifndef OPENSSL_NO_RSA
 222                         !ENGINE_set_RSA(e, &cswift_rsa) ||
 223 #endif
 224 #ifndef OPENSSL_NO_DSA
 225                         !ENGINE_set_DSA(e, &cswift_dsa) ||
 226 #endif
 227 #ifndef OPENSSL_NO_DH
 228                         !ENGINE_set_DH(e, &cswift_dh) ||
 229 #endif
 230                         !ENGINE_set_RAND(e, &cswift_random) ||
 231                         !ENGINE_set_destroy_function(e, cswift_destroy) ||
 232                         !ENGINE_set_init_function(e, cswift_init) ||
 233                         !ENGINE_set_finish_function(e, cswift_finish) ||
 234                         !ENGINE_set_ctrl_function(e, cswift_ctrl) ||
 235                         !ENGINE_set_cmd_defns(e, cswift_cmd_defns))
 236                 return 0;
 237
 238 #ifndef OPENSSL_NO_RSA
 239         /* We know that the "PKCS1_SSLeay()" functions hook properly
 240          * to the cswift-specific mod_exp and mod_exp_crt so we use
 241          * those functions. NB: We don't use ENGINE_openssl() or
 242          * anything "more generic" because something like the RSAref
 243          * code may not hook properly, and if you own one of these
 244          * cards then you have the right to do RSA operations on it
 245          * anyway! */
 246         meth1 = RSA_PKCS1_SSLeay();
 247         cswift_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 248         cswift_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 249         cswift_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
 250         cswift_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
 251 #endif
 252
 253 #ifndef OPENSSL_NO_DH
 254         /* Much the same for Diffie-Hellman */
 255         meth2 = DH_OpenSSL();
 256         cswift_dh.generate_key = meth2->generate_key;
 257         cswift_dh.compute_key = meth2->compute_key;
 258 #endif
 259
 260         /* Ensure the cswift error handling is set up */
 261         ERR_load_CSWIFT_strings();
 262         return 1;
 263         }
 264
 265 static ENGINE *engine_cswift(void)
 266         {
 267         ENGINE *ret = ENGINE_new();
 268         if(!ret)
 269                 return NULL;
 270         if(!bind_helper(ret))
 271                 {
 272                 ENGINE_free(ret);
 273                 return NULL;
 274                 }
 275         return ret;
 276         }
 277
 278 void ENGINE_load_cswift(void)
 279         {
 280         /* Copied from eng_[openssl|dyn].c */
 281         ENGINE *toadd = engine_cswift();
 282         if(!toadd) return;
 283         ENGINE_add(toadd);
 284         ENGINE_free(toadd);
 285         ERR_clear_error();
 286         }
 287
 288 /* This is a process-global DSO handle used for loading and unloading
 289  * the CryptoSwift library. NB: This is only set (or unset) during an
 290  * init() or finish() call (reference counts permitting) and they're
 291  * operating with global locks, so this should be thread-safe
 292  * implicitly. */
 293 static DSO *cswift_dso = NULL;
 294
 295 /* These are the function pointers that are (un)set when the library has
 296  * successfully (un)loaded. */
 297 t_swAcquireAccContext *p_CSwift_AcquireAccContext = NULL;
 298 t_swAttachKeyParam *p_CSwift_AttachKeyParam = NULL;
 299 t_swSimpleRequest *p_CSwift_SimpleRequest = NULL;
 300 t_swReleaseAccContext *p_CSwift_ReleaseAccContext = NULL;
 301
 302 /* Used in the DSO operations. */
 303 static const char *CSWIFT_LIBNAME = NULL;
 304 static const char *get_CSWIFT_LIBNAME(void)
 305         {
 306         if(CSWIFT_LIBNAME)
 307                 return CSWIFT_LIBNAME;
 308         return "swift";
 309         }
 310 static void free_CSWIFT_LIBNAME(void)
 311         {
 312         if(CSWIFT_LIBNAME)
 313                 OPENSSL_free((void*)CSWIFT_LIBNAME);
 314         CSWIFT_LIBNAME = NULL;
 315         }
 316 static long set_CSWIFT_LIBNAME(const char *name)
 317         {
 318         free_CSWIFT_LIBNAME();
 319         return (((CSWIFT_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
 320         }
 321 static const char *CSWIFT_F1 = "swAcquireAccContext";
 322 static const char *CSWIFT_F2 = "swAttachKeyParam";
 323 static const char *CSWIFT_F3 = "swSimpleRequest";
 324 static const char *CSWIFT_F4 = "swReleaseAccContext";
 325
 326
 327 /* CryptoSwift library functions and mechanics - these are used by the
 328  * higher-level functions further down. NB: As and where there's no
 329  * error checking, take a look lower down where these functions are
 330  * called, the checking and error handling is probably down there. */
 331
 332 /* utility function to obtain a context */
 333 static int get_context(SW_CONTEXT_HANDLE *hac)
 334         {
 335         SW_STATUS status;
 336
 337         status = p_CSwift_AcquireAccContext(hac);
 338         if(status != SW_OK)
 339                 return 0;
 340         return 1;
 341         }
 342
 343 /* similarly to release one. */
 344 static void release_context(SW_CONTEXT_HANDLE hac)
 345         {
 346         p_CSwift_ReleaseAccContext(hac);
 347         }
 348
 349 /* Destructor (complements the "ENGINE_cswift()" constructor) */
 350 static int cswift_destroy(ENGINE *e)
 351         {
 352         free_CSWIFT_LIBNAME();
 353         ERR_unload_CSWIFT_strings();
 354         return 1;
 355         }
 356
 357 /* (de)initialisation functions. */
 358 static int cswift_init(ENGINE *e)
 359         {
 360         SW_CONTEXT_HANDLE hac;
 361         t_swAcquireAccContext *p1;
 362         t_swAttachKeyParam *p2;
 363         t_swSimpleRequest *p3;
 364         t_swReleaseAccContext *p4;
 365
 366         if(cswift_dso != NULL)
 367                 {
 368                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_ALREADY_LOADED);
 369                 goto err;
 370                 }
 371         /* Attempt to load libswift.so/swift.dll/whatever. */
 372         cswift_dso = DSO_load(NULL, get_CSWIFT_LIBNAME(), NULL, 0);
 373         if(cswift_dso == NULL)
 374                 {
 375                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
 376                 goto err;
 377                 }
 378         if(!(p1 = (t_swAcquireAccContext *)
 379                                 DSO_bind_func(cswift_dso, CSWIFT_F1)) ||
 380                         !(p2 = (t_swAttachKeyParam *)
 381                                 DSO_bind_func(cswift_dso, CSWIFT_F2)) ||
 382                         !(p3 = (t_swSimpleRequest *)
 383                                 DSO_bind_func(cswift_dso, CSWIFT_F3)) ||
 384                         !(p4 = (t_swReleaseAccContext *)
 385                                 DSO_bind_func(cswift_dso, CSWIFT_F4)))
 386                 {
 387                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
 388                 goto err;
 389                 }
 390         /* Copy the pointers */
 391         p_CSwift_AcquireAccContext = p1;
 392         p_CSwift_AttachKeyParam = p2;
 393         p_CSwift_SimpleRequest = p3;
 394         p_CSwift_ReleaseAccContext = p4;
 395         /* Try and get a context - if not, we may have a DSO but no
 396          * accelerator! */
 397         if(!get_context(&hac))
 398                 {
 399                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_UNIT_FAILURE);
 400                 goto err;
 401                 }
 402         release_context(hac);
 403         /* Everything's fine. */
 404         return 1;
 405 err:
 406         if(cswift_dso)
 407                 DSO_free(cswift_dso);
 408         p_CSwift_AcquireAccContext = NULL;
 409         p_CSwift_AttachKeyParam = NULL;
 410         p_CSwift_SimpleRequest = NULL;
 411         p_CSwift_ReleaseAccContext = NULL;
 412         return 0;
 413         }
 414
 415 static int cswift_finish(ENGINE *e)
 416         {
 417         free_CSWIFT_LIBNAME();
 418         if(cswift_dso == NULL)
 419                 {
 420                 CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_NOT_LOADED);
 421                 return 0;
 422                 }
 423         if(!DSO_free(cswift_dso))
 424                 {
 425                 CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_UNIT_FAILURE);
 426                 return 0;
 427                 }
 428         cswift_dso = NULL;
 429         p_CSwift_AcquireAccContext = NULL;
 430         p_CSwift_AttachKeyParam = NULL;
 431         p_CSwift_SimpleRequest = NULL;
 432         p_CSwift_ReleaseAccContext = NULL;
 433         return 1;
 434         }
 435
 436 static int cswift_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)())
 437         {
 438         int initialised = ((cswift_dso == NULL) ? 0 : 1);
 439         switch(cmd)
 440                 {
 441         case CSWIFT_CMD_SO_PATH:
 442                 if(p == NULL)
 443                         {
 444                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,ERR_R_PASSED_NULL_PARAMETER);
 445                         return 0;
 446                         }
 447                 if(initialised)
 448                         {
 449                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_ALREADY_LOADED);
 450                         return 0;
 451                         }
 452                 return set_CSWIFT_LIBNAME((const char *)p);
 453         default:
 454                 break;
 455                 }
 456         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 457         return 0;
 458         }
 459
 460 /* Un petit mod_exp */
 461 static int cswift_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 462                         const BIGNUM *m, BN_CTX *ctx)
 463         {
 464         /* I need somewhere to store temporary serialised values for
 465          * use with the CryptoSwift API calls. A neat cheat - I'll use
 466          * BIGNUMs from the BN_CTX but access their arrays directly as
 467          * byte arrays <grin>. This way I don't have to clean anything
 468          * up. */
 469         BIGNUM *modulus;
 470         BIGNUM *exponent;
 471         BIGNUM *argument;
 472         BIGNUM *result;
 473         SW_STATUS sw_status;
 474         SW_LARGENUMBER arg, res;
 475         SW_PARAM sw_param;
 476         SW_CONTEXT_HANDLE hac;
 477         int to_return, acquired;
 478
 479         modulus = exponent = argument = result = NULL;
 480         to_return = 0; /* expect failure */
 481         acquired = 0;
 482
 483         if(!get_context(&hac))
 484                 {
 485                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_UNIT_FAILURE);
 486                 goto err;
 487                 }
 488         acquired = 1;
 489         /* Prepare the params */
 490         BN_CTX_start(ctx);
 491         modulus = BN_CTX_get(ctx);
 492         exponent = BN_CTX_get(ctx);
 493         argument = BN_CTX_get(ctx);
 494         result = BN_CTX_get(ctx);
 495         if(!result)
 496                 {
 497                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_CTX_FULL);
 498                 goto err;
 499                 }
 500         if(!bn_wexpand(modulus, m->top) || !bn_wexpand(exponent, p->top) ||
 501                 !bn_wexpand(argument, a->top) || !bn_wexpand(result, m->top))
 502                 {
 503                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_EXPAND_FAIL);
 504                 goto err;
 505                 }
 506         sw_param.type = SW_ALG_EXP;
 507         sw_param.up.exp.modulus.nbytes = BN_bn2bin(m,
 508                 (unsigned char *)modulus->d);
 509         sw_param.up.exp.modulus.value = (unsigned char *)modulus->d;
 510         sw_param.up.exp.exponent.nbytes = BN_bn2bin(p,
 511                 (unsigned char *)exponent->d);
 512         sw_param.up.exp.exponent.value = (unsigned char *)exponent->d;
 513         /* Attach the key params */
 514         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 515         switch(sw_status)
 516                 {
 517         case SW_OK:
 518                 break;
 519         case SW_ERR_INPUT_SIZE:
 520                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BAD_KEY_SIZE);
 521                 goto err;
 522         default:
 523                 {
 524                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 525                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
 526                 sprintf(tmpbuf, "%ld", sw_status);
 527                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 528                 }
 529                 goto err;
 530                 }
 531         /* Prepare the argument and response */
 532         arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
 533         arg.value = (unsigned char *)argument->d;
 534         res.nbytes = BN_num_bytes(m);
 535         memset(result->d, 0, res.nbytes);
 536         res.value = (unsigned char *)result->d;
 537         /* Perform the operation */
 538         if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP, &arg, 1,
 539                 &res, 1)) != SW_OK)
 540                 {
 541                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 542                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
 543                 sprintf(tmpbuf, "%ld", sw_status);
 544                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 545                 goto err;
 546                 }
 547         /* Convert the response */
 548         BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
 549         to_return = 1;
 550 err:
 551         if(acquired)
 552                 release_context(hac);
 553         BN_CTX_end(ctx);
 554         return to_return;
 555         }
 556
 557 /* Un petit mod_exp chinois */
 558 static int cswift_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 559                         const BIGNUM *q, const BIGNUM *dmp1,
 560                         const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
 561         {
 562         SW_STATUS sw_status;
 563         SW_LARGENUMBER arg, res;
 564         SW_PARAM sw_param;
 565         SW_CONTEXT_HANDLE hac;
 566         BIGNUM *rsa_p = NULL;
 567         BIGNUM *rsa_q = NULL;
 568         BIGNUM *rsa_dmp1 = NULL;
 569         BIGNUM *rsa_dmq1 = NULL;
 570         BIGNUM *rsa_iqmp = NULL;
 571         BIGNUM *argument = NULL;
 572         BIGNUM *result = NULL;
 573         int to_return = 0; /* expect failure */
 574         int acquired = 0;
 575
 576         if(!get_context(&hac))
 577                 {
 578                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_UNIT_FAILURE);
 579                 goto err;
 580                 }
 581         acquired = 1;
 582         /* Prepare the params */
 583         BN_CTX_start(ctx);
 584         rsa_p = BN_CTX_get(ctx);
 585         rsa_q = BN_CTX_get(ctx);
 586         rsa_dmp1 = BN_CTX_get(ctx);
 587         rsa_dmq1 = BN_CTX_get(ctx);
 588         rsa_iqmp = BN_CTX_get(ctx);
 589         argument = BN_CTX_get(ctx);
 590         result = BN_CTX_get(ctx);
 591         if(!result)
 592                 {
 593                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_CTX_FULL);
 594                 goto err;
 595                 }
 596         if(!bn_wexpand(rsa_p, p->top) || !bn_wexpand(rsa_q, q->top) ||
 597                         !bn_wexpand(rsa_dmp1, dmp1->top) ||
 598                         !bn_wexpand(rsa_dmq1, dmq1->top) ||
 599                         !bn_wexpand(rsa_iqmp, iqmp->top) ||
 600                         !bn_wexpand(argument, a->top) ||
 601                         !bn_wexpand(result, p->top + q->top))
 602                 {
 603                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
 604                 goto err;
 605                 }
 606         sw_param.type = SW_ALG_CRT;
 607         sw_param.up.crt.p.nbytes = BN_bn2bin(p, (unsigned char *)rsa_p->d);
 608         sw_param.up.crt.p.value = (unsigned char *)rsa_p->d;
 609         sw_param.up.crt.q.nbytes = BN_bn2bin(q, (unsigned char *)rsa_q->d);
 610         sw_param.up.crt.q.value = (unsigned char *)rsa_q->d;
 611         sw_param.up.crt.dmp1.nbytes = BN_bn2bin(dmp1,
 612                 (unsigned char *)rsa_dmp1->d);
 613         sw_param.up.crt.dmp1.value = (unsigned char *)rsa_dmp1->d;
 614         sw_param.up.crt.dmq1.nbytes = BN_bn2bin(dmq1,
 615                 (unsigned char *)rsa_dmq1->d);
 616         sw_param.up.crt.dmq1.value = (unsigned char *)rsa_dmq1->d;
 617         sw_param.up.crt.iqmp.nbytes = BN_bn2bin(iqmp,
 618                 (unsigned char *)rsa_iqmp->d);
 619         sw_param.up.crt.iqmp.value = (unsigned char *)rsa_iqmp->d;
 620         /* Attach the key params */
 621         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 622         switch(sw_status)
 623                 {
 624         case SW_OK:
 625                 break;
 626         case SW_ERR_INPUT_SIZE:
 627                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BAD_KEY_SIZE);
 628                 goto err;
 629         default:
 630                 {
 631                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 632                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
 633                 sprintf(tmpbuf, "%ld", sw_status);
 634                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 635                 }
 636                 goto err;
 637                 }
 638         /* Prepare the argument and response */
 639         arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
 640         arg.value = (unsigned char *)argument->d;
 641         res.nbytes = 2 * BN_num_bytes(p);
 642         memset(result->d, 0, res.nbytes);
 643         res.value = (unsigned char *)result->d;
 644         /* Perform the operation */
 645         if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP_CRT, &arg, 1,
 646                 &res, 1)) != SW_OK)
 647                 {
 648                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 649                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
 650                 sprintf(tmpbuf, "%ld", sw_status);
 651                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 652                 goto err;
 653                 }
 654         /* Convert the response */
 655         BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
 656         to_return = 1;
 657 err:
 658         if(acquired)
 659                 release_context(hac);
 660         BN_CTX_end(ctx);
 661         return to_return;
 662         }
 663
 664 #ifndef OPENSSL_NO_RSA
 665 static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
 666         {
 667         BN_CTX *ctx;
 668         int to_return = 0;
 669
 670         if((ctx = BN_CTX_new()) == NULL)
 671                 goto err;
 672         if(!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp)
 673                 {
 674                 CSWIFTerr(CSWIFT_F_CSWIFT_RSA_MOD_EXP,CSWIFT_R_MISSING_KEY_COMPONENTS);
 675                 goto err;
 676                 }
 677         to_return = cswift_mod_exp_crt(r0, I, rsa->p, rsa->q, rsa->dmp1,
 678                 rsa->dmq1, rsa->iqmp, ctx);
 679 err:
 680         if(ctx)
 681                 BN_CTX_free(ctx);
 682         return to_return;
 683         }
 684 #endif
 685
 686 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 687 static int cswift_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 688                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 689         {
 690         return cswift_mod_exp(r, a, p, m, ctx);
 691         }
 692
 693 #ifndef OPENSSL_NO_DSA
 694 static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa)
 695         {
 696         SW_CONTEXT_HANDLE hac;
 697         SW_PARAM sw_param;
 698         SW_STATUS sw_status;
 699         SW_LARGENUMBER arg, res;
 700         unsigned char *ptr;
 701         BN_CTX *ctx;
 702         BIGNUM *dsa_p = NULL;
 703         BIGNUM *dsa_q = NULL;
 704         BIGNUM *dsa_g = NULL;
 705         BIGNUM *dsa_key = NULL;
 706         BIGNUM *result = NULL;
 707         DSA_SIG *to_return = NULL;
 708         int acquired = 0;
 709
 710         if((ctx = BN_CTX_new()) == NULL)
 711                 goto err;
 712         if(!get_context(&hac))
 713                 {
 714                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_UNIT_FAILURE);
 715                 goto err;
 716                 }
 717         acquired = 1;
 718         /* Prepare the params */
 719         BN_CTX_start(ctx);
 720         dsa_p = BN_CTX_get(ctx);
 721         dsa_q = BN_CTX_get(ctx);
 722         dsa_g = BN_CTX_get(ctx);
 723         dsa_key = BN_CTX_get(ctx);
 724         result = BN_CTX_get(ctx);
 725         if(!result)
 726                 {
 727                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BN_CTX_FULL);
 728                 goto err;
 729                 }
 730         if(!bn_wexpand(dsa_p, dsa->p->top) ||
 731                         !bn_wexpand(dsa_q, dsa->q->top) ||
 732                         !bn_wexpand(dsa_g, dsa->g->top) ||
 733                         !bn_wexpand(dsa_key, dsa->priv_key->top) ||
 734                         !bn_wexpand(result, dsa->p->top))
 735                 {
 736                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BN_EXPAND_FAIL);
 737                 goto err;
 738                 }
 739         sw_param.type = SW_ALG_DSA;
 740         sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
 741                                 (unsigned char *)dsa_p->d);
 742         sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
 743         sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
 744                                 (unsigned char *)dsa_q->d);
 745         sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
 746         sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
 747                                 (unsigned char *)dsa_g->d);
 748         sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
 749         sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->priv_key,
 750                                 (unsigned char *)dsa_key->d);
 751         sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
 752         /* Attach the key params */
 753         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 754         switch(sw_status)
 755                 {
 756         case SW_OK:
 757                 break;
 758         case SW_ERR_INPUT_SIZE:
 759                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BAD_KEY_SIZE);
 760                 goto err;
 761         default:
 762                 {
 763                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 764                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_REQUEST_FAILED);
 765                 sprintf(tmpbuf, "%ld", sw_status);
 766                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 767                 }
 768                 goto err;
 769                 }
 770         /* Prepare the argument and response */
 771         arg.nbytes = dlen;
 772         arg.value = (unsigned char *)dgst;
 773         res.nbytes = BN_num_bytes(dsa->p);
 774         memset(result->d, 0, res.nbytes);
 775         res.value = (unsigned char *)result->d;
 776         /* Perform the operation */
 777         sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_SIGN, &arg, 1,
 778                 &res, 1);
 779         if(sw_status != SW_OK)
 780                 {
 781                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 782                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_REQUEST_FAILED);
 783                 sprintf(tmpbuf, "%ld", sw_status);
 784                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 785                 goto err;
 786                 }
 787         /* Convert the response */
 788         ptr = (unsigned char *)result->d;
 789         if((to_return = DSA_SIG_new()) == NULL)
 790                 goto err;
 791         to_return->r = BN_bin2bn((unsigned char *)result->d, 20, NULL);
 792         to_return->s = BN_bin2bn((unsigned char *)result->d + 20, 20, NULL);
 793
 794 err:
 795         if(acquired)
 796                 release_context(hac);
 797         if(ctx)
 798                 {
 799                 BN_CTX_end(ctx);
 800                 BN_CTX_free(ctx);
 801                 }
 802         return to_return;
 803         }
 804
 805 static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
 806                                 DSA_SIG *sig, DSA *dsa)
 807         {
 808         SW_CONTEXT_HANDLE hac;
 809         SW_PARAM sw_param;
 810         SW_STATUS sw_status;
 811         SW_LARGENUMBER arg[2], res;
 812         unsigned long sig_result;
 813         BN_CTX *ctx;
 814         BIGNUM *dsa_p = NULL;
 815         BIGNUM *dsa_q = NULL;
 816         BIGNUM *dsa_g = NULL;
 817         BIGNUM *dsa_key = NULL;
 818         BIGNUM *argument = NULL;
 819         int to_return = -1;
 820         int acquired = 0;
 821
 822         if((ctx = BN_CTX_new()) == NULL)
 823                 goto err;
 824         if(!get_context(&hac))
 825                 {
 826                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_UNIT_FAILURE);
 827                 goto err;
 828                 }
 829         acquired = 1;
 830         /* Prepare the params */
 831         BN_CTX_start(ctx);
 832         dsa_p = BN_CTX_get(ctx);
 833         dsa_q = BN_CTX_get(ctx);
 834         dsa_g = BN_CTX_get(ctx);
 835         dsa_key = BN_CTX_get(ctx);
 836         argument = BN_CTX_get(ctx);
 837         if(!argument)
 838                 {
 839                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BN_CTX_FULL);
 840                 goto err;
 841                 }
 842         if(!bn_wexpand(dsa_p, dsa->p->top) ||
 843                         !bn_wexpand(dsa_q, dsa->q->top) ||
 844                         !bn_wexpand(dsa_g, dsa->g->top) ||
 845                         !bn_wexpand(dsa_key, dsa->pub_key->top) ||
 846                         !bn_wexpand(argument, 40))
 847                 {
 848                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BN_EXPAND_FAIL);
 849                 goto err;
 850                 }
 851         sw_param.type = SW_ALG_DSA;
 852         sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
 853                                 (unsigned char *)dsa_p->d);
 854         sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
 855         sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
 856                                 (unsigned char *)dsa_q->d);
 857         sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
 858         sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
 859                                 (unsigned char *)dsa_g->d);
 860         sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
 861         sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->pub_key,
 862                                 (unsigned char *)dsa_key->d);
 863         sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
 864         /* Attach the key params */
 865         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 866         switch(sw_status)
 867                 {
 868         case SW_OK:
 869                 break;
 870         case SW_ERR_INPUT_SIZE:
 871                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BAD_KEY_SIZE);
 872                 goto err;
 873         default:
 874                 {
 875                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 876                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_REQUEST_FAILED);
 877                 sprintf(tmpbuf, "%ld", sw_status);
 878                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 879                 }
 880                 goto err;
 881                 }
 882         /* Prepare the argument and response */
 883         arg[0].nbytes = dgst_len;
 884         arg[0].value = (unsigned char *)dgst;
 885         arg[1].nbytes = 40;
 886         arg[1].value = (unsigned char *)argument->d;
 887         memset(arg[1].value, 0, 40);
 888         BN_bn2bin(sig->r, arg[1].value + 20 - BN_num_bytes(sig->r));
 889         BN_bn2bin(sig->s, arg[1].value + 40 - BN_num_bytes(sig->s));
 890         res.nbytes = 4; /* unsigned long */
 891         res.value = (unsigned char *)(&sig_result);
 892         /* Perform the operation */
 893         sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_VERIFY, arg, 2,
 894                 &res, 1);
 895         if(sw_status != SW_OK)
 896                 {
 897                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 898                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_REQUEST_FAILED);
 899                 sprintf(tmpbuf, "%ld", sw_status);
 900                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 901                 goto err;
 902                 }
 903         /* Convert the response */
 904         to_return = ((sig_result == 0) ? 0 : 1);
 905
 906 err:
 907         if(acquired)
 908                 release_context(hac);
 909         if(ctx)
 910                 {
 911                 BN_CTX_end(ctx);
 912                 BN_CTX_free(ctx);
 913                 }
 914         return to_return;
 915         }
 916 #endif
 917
 918 #ifndef OPENSSL_NO_DH
 919 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 920 static int cswift_mod_exp_dh(const DH *dh, BIGNUM *r,
 921                 const BIGNUM *a, const BIGNUM *p,
 922                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 923         {
 924         return cswift_mod_exp(r, a, p, m, ctx);
 925         }
 926 #endif
 927
 928 /* Random bytes are good */
 929 static int cswift_rand_bytes(unsigned char *buf, int num)
 930 {
 931         SW_CONTEXT_HANDLE hac;
 932         SW_STATUS swrc;
 933         SW_LARGENUMBER largenum;
 934         size_t nbytes = 0;
 935         int acquired = 0;
 936         int to_return = 0; /* assume failure */
 937
 938         if (!get_context(&hac))
 939         {
 940                 CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_UNIT_FAILURE);
 941                 goto err;
 942         }
 943         acquired = 1;
 944
 945         while (nbytes < (size_t)num)
 946         {
 947                 /* tell CryptoSwift how many bytes we want and where we want it.
 948                  * Note: - CryptoSwift cannot do more than 4096 bytes at a time.
 949                  *       - CryptoSwift can only do multiple of 32-bits. */
 950                 largenum.value = (SW_BYTE *) buf + nbytes;
 951                 if (4096 > num - nbytes)
 952                         largenum.nbytes = num - nbytes;
 953                 else
 954                         largenum.nbytes = 4096;
 955
 956                 swrc = p_CSwift_SimpleRequest(hac, SW_CMD_RAND, NULL, 0, &largenum, 1);
 957                 if (swrc != SW_OK)
 958                 {
 959                         char tmpbuf[20];
 960                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_REQUEST_FAILED);
 961                         sprintf(tmpbuf, "%ld", swrc);
 962                         ERR_add_error_data(2, "CryptoSwift error number is ", tmpbuf);
 963                         goto err;
 964                 }
 965
 966                 nbytes += largenum.nbytes;
 967         }
 968         to_return = 1;  /* success */
 969
 970 err:
 971         if (acquired)
 972                 release_context(hac);
 973         return to_return;
 974 }
 975
 976 static int cswift_rand_status(void)
 977 {
 978         return 1;
 979 }
 980
 981
 982 /* This stuff is needed if this ENGINE is being compiled into a self-contained
 983  * shared-library. */
 984 #ifndef OPENSSL_NO_DYNAMIC_ENGINE
 985 static int bind_fn(ENGINE *e, const char *id)
 986         {
 987         if(id && (strcmp(id, engine_cswift_id) != 0))
 988                 return 0;
 989         if(!bind_helper(e))
 990                 return 0;
 991         return 1;
 992         }
 993 IMPLEMENT_DYNAMIC_CHECK_FN()
 994 IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
 995 #endif /* OPENSSL_NO_DYNAMIC_ENGINE */
 996
 997 #endif /* !OPENSSL_NO_HW_CSWIFT */
 998 #endif /* !OPENSSL_NO_HW */