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         NULL
 159         };
 160 #endif
 161
 162 #ifndef OPENSSL_NO_DSA
 163 /* Our internal DSA_METHOD that we provide pointers to */
 164 static DSA_METHOD cswift_dsa =
 165         {
 166         "CryptoSwift DSA method",
 167         cswift_dsa_sign,
 168         NULL, /* dsa_sign_setup */
 169         cswift_dsa_verify,
 170         NULL, /* dsa_mod_exp */
 171         NULL, /* bn_mod_exp */
 172         NULL, /* init */
 173         NULL, /* finish */
 174         0, /* flags */
 175         NULL /* app_data */
 176         };
 177 #endif
 178
 179 #ifndef OPENSSL_NO_DH
 180 /* Our internal DH_METHOD that we provide pointers to */
 181 static DH_METHOD cswift_dh =
 182         {
 183         "CryptoSwift DH method",
 184         NULL,
 185         NULL,
 186         cswift_mod_exp_dh,
 187         NULL,
 188         NULL,
 189         0,
 190         NULL
 191         };
 192 #endif
 193
 194 static RAND_METHOD cswift_random =
 195     {
 196     /* "CryptoSwift RAND method", */
 197     NULL,
 198     cswift_rand_bytes,
 199     NULL,
 200     NULL,
 201     cswift_rand_bytes,
 202     cswift_rand_status,
 203     };
 204
 205
 206 /* Constants used when creating the ENGINE */
 207 static const char *engine_cswift_id = "cswift";
 208 static const char *engine_cswift_name = "CryptoSwift hardware engine support";
 209
 210 /* This internal function is used by ENGINE_cswift() and possibly by the
 211  * "dynamic" ENGINE support too */
 212 static int bind_helper(ENGINE *e)
 213         {
 214 #ifndef OPENSSL_NO_RSA
 215         const RSA_METHOD *meth1;
 216 #endif
 217 #ifndef OPENSSL_NO_DH
 218         const DH_METHOD *meth2;
 219 #endif
 220         if(!ENGINE_set_id(e, engine_cswift_id) ||
 221                         !ENGINE_set_name(e, engine_cswift_name) ||
 222 #ifndef OPENSSL_NO_RSA
 223                         !ENGINE_set_RSA(e, &cswift_rsa) ||
 224 #endif
 225 #ifndef OPENSSL_NO_DSA
 226                         !ENGINE_set_DSA(e, &cswift_dsa) ||
 227 #endif
 228 #ifndef OPENSSL_NO_DH
 229                         !ENGINE_set_DH(e, &cswift_dh) ||
 230 #endif
 231                         !ENGINE_set_RAND(e, &cswift_random) ||
 232                         !ENGINE_set_destroy_function(e, cswift_destroy) ||
 233                         !ENGINE_set_init_function(e, cswift_init) ||
 234                         !ENGINE_set_finish_function(e, cswift_finish) ||
 235                         !ENGINE_set_ctrl_function(e, cswift_ctrl) ||
 236                         !ENGINE_set_cmd_defns(e, cswift_cmd_defns))
 237                 return 0;
 238
 239 #ifndef OPENSSL_NO_RSA
 240         /* We know that the "PKCS1_SSLeay()" functions hook properly
 241          * to the cswift-specific mod_exp and mod_exp_crt so we use
 242          * those functions. NB: We don't use ENGINE_openssl() or
 243          * anything "more generic" because something like the RSAref
 244          * code may not hook properly, and if you own one of these
 245          * cards then you have the right to do RSA operations on it
 246          * anyway! */
 247         meth1 = RSA_PKCS1_SSLeay();
 248         cswift_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 249         cswift_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 250         cswift_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
 251         cswift_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
 252 #endif
 253
 254 #ifndef OPENSSL_NO_DH
 255         /* Much the same for Diffie-Hellman */
 256         meth2 = DH_OpenSSL();
 257         cswift_dh.generate_key = meth2->generate_key;
 258         cswift_dh.compute_key = meth2->compute_key;
 259 #endif
 260
 261         /* Ensure the cswift error handling is set up */
 262         ERR_load_CSWIFT_strings();
 263         return 1;
 264         }
 265
 266 #ifdef OPENSSL_NO_DYNAMIC_ENGINE
 267 static ENGINE *engine_cswift(void)
 268         {
 269         ENGINE *ret = ENGINE_new();
 270         if(!ret)
 271                 return NULL;
 272         if(!bind_helper(ret))
 273                 {
 274                 ENGINE_free(ret);
 275                 return NULL;
 276                 }
 277         return ret;
 278         }
 279
 280 void ENGINE_load_cswift(void)
 281         {
 282         /* Copied from eng_[openssl|dyn].c */
 283         ENGINE *toadd = engine_cswift();
 284         if(!toadd) return;
 285         ENGINE_add(toadd);
 286         ENGINE_free(toadd);
 287         ERR_clear_error();
 288         }
 289 #endif
 290
 291 /* This is a process-global DSO handle used for loading and unloading
 292  * the CryptoSwift library. NB: This is only set (or unset) during an
 293  * init() or finish() call (reference counts permitting) and they're
 294  * operating with global locks, so this should be thread-safe
 295  * implicitly. */
 296 static DSO *cswift_dso = NULL;
 297
 298 /* These are the function pointers that are (un)set when the library has
 299  * successfully (un)loaded. */
 300 t_swAcquireAccContext *p_CSwift_AcquireAccContext = NULL;
 301 t_swAttachKeyParam *p_CSwift_AttachKeyParam = NULL;
 302 t_swSimpleRequest *p_CSwift_SimpleRequest = NULL;
 303 t_swReleaseAccContext *p_CSwift_ReleaseAccContext = NULL;
 304
 305 /* Used in the DSO operations. */
 306 static const char *CSWIFT_LIBNAME = NULL;
 307 static const char *get_CSWIFT_LIBNAME(void)
 308         {
 309         if(CSWIFT_LIBNAME)
 310                 return CSWIFT_LIBNAME;
 311         return "swift";
 312         }
 313 static void free_CSWIFT_LIBNAME(void)
 314         {
 315         if(CSWIFT_LIBNAME)
 316                 OPENSSL_free((void*)CSWIFT_LIBNAME);
 317         CSWIFT_LIBNAME = NULL;
 318         }
 319 static long set_CSWIFT_LIBNAME(const char *name)
 320         {
 321         free_CSWIFT_LIBNAME();
 322         return (((CSWIFT_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
 323         }
 324 static const char *CSWIFT_F1 = "swAcquireAccContext";
 325 static const char *CSWIFT_F2 = "swAttachKeyParam";
 326 static const char *CSWIFT_F3 = "swSimpleRequest";
 327 static const char *CSWIFT_F4 = "swReleaseAccContext";
 328
 329
 330 /* CryptoSwift library functions and mechanics - these are used by the
 331  * higher-level functions further down. NB: As and where there's no
 332  * error checking, take a look lower down where these functions are
 333  * called, the checking and error handling is probably down there. */
 334
 335 /* utility function to obtain a context */
 336 static int get_context(SW_CONTEXT_HANDLE *hac)
 337         {
 338         SW_STATUS status;
 339
 340         status = p_CSwift_AcquireAccContext(hac);
 341         if(status != SW_OK)
 342                 return 0;
 343         return 1;
 344         }
 345
 346 /* similarly to release one. */
 347 static void release_context(SW_CONTEXT_HANDLE hac)
 348         {
 349         p_CSwift_ReleaseAccContext(hac);
 350         }
 351
 352 /* Destructor (complements the "ENGINE_cswift()" constructor) */
 353 static int cswift_destroy(ENGINE *e)
 354         {
 355         free_CSWIFT_LIBNAME();
 356         ERR_unload_CSWIFT_strings();
 357         return 1;
 358         }
 359
 360 /* (de)initialisation functions. */
 361 static int cswift_init(ENGINE *e)
 362         {
 363         SW_CONTEXT_HANDLE hac;
 364         t_swAcquireAccContext *p1;
 365         t_swAttachKeyParam *p2;
 366         t_swSimpleRequest *p3;
 367         t_swReleaseAccContext *p4;
 368
 369         if(cswift_dso != NULL)
 370                 {
 371                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_ALREADY_LOADED);
 372                 goto err;
 373                 }
 374         /* Attempt to load libswift.so/swift.dll/whatever. */
 375         cswift_dso = DSO_load(NULL, get_CSWIFT_LIBNAME(), NULL, 0);
 376         if(cswift_dso == NULL)
 377                 {
 378                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
 379                 goto err;
 380                 }
 381         if(!(p1 = (t_swAcquireAccContext *)
 382                                 DSO_bind_func(cswift_dso, CSWIFT_F1)) ||
 383                         !(p2 = (t_swAttachKeyParam *)
 384                                 DSO_bind_func(cswift_dso, CSWIFT_F2)) ||
 385                         !(p3 = (t_swSimpleRequest *)
 386                                 DSO_bind_func(cswift_dso, CSWIFT_F3)) ||
 387                         !(p4 = (t_swReleaseAccContext *)
 388                                 DSO_bind_func(cswift_dso, CSWIFT_F4)))
 389                 {
 390                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
 391                 goto err;
 392                 }
 393         /* Copy the pointers */
 394         p_CSwift_AcquireAccContext = p1;
 395         p_CSwift_AttachKeyParam = p2;
 396         p_CSwift_SimpleRequest = p3;
 397         p_CSwift_ReleaseAccContext = p4;
 398         /* Try and get a context - if not, we may have a DSO but no
 399          * accelerator! */
 400         if(!get_context(&hac))
 401                 {
 402                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_UNIT_FAILURE);
 403                 goto err;
 404                 }
 405         release_context(hac);
 406         /* Everything's fine. */
 407         return 1;
 408 err:
 409         if(cswift_dso)
 410                 DSO_free(cswift_dso);
 411         p_CSwift_AcquireAccContext = NULL;
 412         p_CSwift_AttachKeyParam = NULL;
 413         p_CSwift_SimpleRequest = NULL;
 414         p_CSwift_ReleaseAccContext = NULL;
 415         return 0;
 416         }
 417
 418 static int cswift_finish(ENGINE *e)
 419         {
 420         free_CSWIFT_LIBNAME();
 421         if(cswift_dso == NULL)
 422                 {
 423                 CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_NOT_LOADED);
 424                 return 0;
 425                 }
 426         if(!DSO_free(cswift_dso))
 427                 {
 428                 CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_UNIT_FAILURE);
 429                 return 0;
 430                 }
 431         cswift_dso = NULL;
 432         p_CSwift_AcquireAccContext = NULL;
 433         p_CSwift_AttachKeyParam = NULL;
 434         p_CSwift_SimpleRequest = NULL;
 435         p_CSwift_ReleaseAccContext = NULL;
 436         return 1;
 437         }
 438
 439 static int cswift_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)())
 440         {
 441         int initialised = ((cswift_dso == NULL) ? 0 : 1);
 442         switch(cmd)
 443                 {
 444         case CSWIFT_CMD_SO_PATH:
 445                 if(p == NULL)
 446                         {
 447                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,ERR_R_PASSED_NULL_PARAMETER);
 448                         return 0;
 449                         }
 450                 if(initialised)
 451                         {
 452                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_ALREADY_LOADED);
 453                         return 0;
 454                         }
 455                 return set_CSWIFT_LIBNAME((const char *)p);
 456         default:
 457                 break;
 458                 }
 459         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 460         return 0;
 461         }
 462
 463 /* Un petit mod_exp */
 464 static int cswift_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 465                         const BIGNUM *m, BN_CTX *ctx)
 466         {
 467         /* I need somewhere to store temporary serialised values for
 468          * use with the CryptoSwift API calls. A neat cheat - I'll use
 469          * BIGNUMs from the BN_CTX but access their arrays directly as
 470          * byte arrays <grin>. This way I don't have to clean anything
 471          * up. */
 472         BIGNUM *modulus;
 473         BIGNUM *exponent;
 474         BIGNUM *argument;
 475         BIGNUM *result;
 476         SW_STATUS sw_status;
 477         SW_LARGENUMBER arg, res;
 478         SW_PARAM sw_param;
 479         SW_CONTEXT_HANDLE hac;
 480         int to_return, acquired;
 481
 482         modulus = exponent = argument = result = NULL;
 483         to_return = 0; /* expect failure */
 484         acquired = 0;
 485
 486         if(!get_context(&hac))
 487                 {
 488                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_UNIT_FAILURE);
 489                 goto err;
 490                 }
 491         acquired = 1;
 492         /* Prepare the params */
 493         BN_CTX_start(ctx);
 494         modulus = BN_CTX_get(ctx);
 495         exponent = BN_CTX_get(ctx);
 496         argument = BN_CTX_get(ctx);
 497         result = BN_CTX_get(ctx);
 498         if(!result)
 499                 {
 500                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_CTX_FULL);
 501                 goto err;
 502                 }
 503         if(!bn_wexpand(modulus, m->top) || !bn_wexpand(exponent, p->top) ||
 504                 !bn_wexpand(argument, a->top) || !bn_wexpand(result, m->top))
 505                 {
 506                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_EXPAND_FAIL);
 507                 goto err;
 508                 }
 509         sw_param.type = SW_ALG_EXP;
 510         sw_param.up.exp.modulus.nbytes = BN_bn2bin(m,
 511                 (unsigned char *)modulus->d);
 512         sw_param.up.exp.modulus.value = (unsigned char *)modulus->d;
 513         sw_param.up.exp.exponent.nbytes = BN_bn2bin(p,
 514                 (unsigned char *)exponent->d);
 515         sw_param.up.exp.exponent.value = (unsigned char *)exponent->d;
 516         /* Attach the key params */
 517         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 518         switch(sw_status)
 519                 {
 520         case SW_OK:
 521                 break;
 522         case SW_ERR_INPUT_SIZE:
 523                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BAD_KEY_SIZE);
 524                 goto err;
 525         default:
 526                 {
 527                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 528                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
 529                 sprintf(tmpbuf, "%ld", sw_status);
 530                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 531                 }
 532                 goto err;
 533                 }
 534         /* Prepare the argument and response */
 535         arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
 536         arg.value = (unsigned char *)argument->d;
 537         res.nbytes = BN_num_bytes(m);
 538         memset(result->d, 0, res.nbytes);
 539         res.value = (unsigned char *)result->d;
 540         /* Perform the operation */
 541         if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP, &arg, 1,
 542                 &res, 1)) != SW_OK)
 543                 {
 544                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 545                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
 546                 sprintf(tmpbuf, "%ld", sw_status);
 547                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 548                 goto err;
 549                 }
 550         /* Convert the response */
 551         BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
 552         to_return = 1;
 553 err:
 554         if(acquired)
 555                 release_context(hac);
 556         BN_CTX_end(ctx);
 557         return to_return;
 558         }
 559
 560 /* Un petit mod_exp chinois */
 561 static int cswift_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 562                         const BIGNUM *q, const BIGNUM *dmp1,
 563                         const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
 564         {
 565         SW_STATUS sw_status;
 566         SW_LARGENUMBER arg, res;
 567         SW_PARAM sw_param;
 568         SW_CONTEXT_HANDLE hac;
 569         BIGNUM *rsa_p = NULL;
 570         BIGNUM *rsa_q = NULL;
 571         BIGNUM *rsa_dmp1 = NULL;
 572         BIGNUM *rsa_dmq1 = NULL;
 573         BIGNUM *rsa_iqmp = NULL;
 574         BIGNUM *argument = NULL;
 575         BIGNUM *result = NULL;
 576         int to_return = 0; /* expect failure */
 577         int acquired = 0;
 578
 579         if(!get_context(&hac))
 580                 {
 581                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_UNIT_FAILURE);
 582                 goto err;
 583                 }
 584         acquired = 1;
 585         /* Prepare the params */
 586         BN_CTX_start(ctx);
 587         rsa_p = BN_CTX_get(ctx);
 588         rsa_q = BN_CTX_get(ctx);
 589         rsa_dmp1 = BN_CTX_get(ctx);
 590         rsa_dmq1 = BN_CTX_get(ctx);
 591         rsa_iqmp = BN_CTX_get(ctx);
 592         argument = BN_CTX_get(ctx);
 593         result = BN_CTX_get(ctx);
 594         if(!result)
 595                 {
 596                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_CTX_FULL);
 597                 goto err;
 598                 }
 599         if(!bn_wexpand(rsa_p, p->top) || !bn_wexpand(rsa_q, q->top) ||
 600                         !bn_wexpand(rsa_dmp1, dmp1->top) ||
 601                         !bn_wexpand(rsa_dmq1, dmq1->top) ||
 602                         !bn_wexpand(rsa_iqmp, iqmp->top) ||
 603                         !bn_wexpand(argument, a->top) ||
 604                         !bn_wexpand(result, p->top + q->top))
 605                 {
 606                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
 607                 goto err;
 608                 }
 609         sw_param.type = SW_ALG_CRT;
 610         sw_param.up.crt.p.nbytes = BN_bn2bin(p, (unsigned char *)rsa_p->d);
 611         sw_param.up.crt.p.value = (unsigned char *)rsa_p->d;
 612         sw_param.up.crt.q.nbytes = BN_bn2bin(q, (unsigned char *)rsa_q->d);
 613         sw_param.up.crt.q.value = (unsigned char *)rsa_q->d;
 614         sw_param.up.crt.dmp1.nbytes = BN_bn2bin(dmp1,
 615                 (unsigned char *)rsa_dmp1->d);
 616         sw_param.up.crt.dmp1.value = (unsigned char *)rsa_dmp1->d;
 617         sw_param.up.crt.dmq1.nbytes = BN_bn2bin(dmq1,
 618                 (unsigned char *)rsa_dmq1->d);
 619         sw_param.up.crt.dmq1.value = (unsigned char *)rsa_dmq1->d;
 620         sw_param.up.crt.iqmp.nbytes = BN_bn2bin(iqmp,
 621                 (unsigned char *)rsa_iqmp->d);
 622         sw_param.up.crt.iqmp.value = (unsigned char *)rsa_iqmp->d;
 623         /* Attach the key params */
 624         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 625         switch(sw_status)
 626                 {
 627         case SW_OK:
 628                 break;
 629         case SW_ERR_INPUT_SIZE:
 630                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BAD_KEY_SIZE);
 631                 goto err;
 632         default:
 633                 {
 634                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 635                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
 636                 sprintf(tmpbuf, "%ld", sw_status);
 637                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 638                 }
 639                 goto err;
 640                 }
 641         /* Prepare the argument and response */
 642         arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
 643         arg.value = (unsigned char *)argument->d;
 644         res.nbytes = 2 * BN_num_bytes(p);
 645         memset(result->d, 0, res.nbytes);
 646         res.value = (unsigned char *)result->d;
 647         /* Perform the operation */
 648         if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP_CRT, &arg, 1,
 649                 &res, 1)) != SW_OK)
 650                 {
 651                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 652                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
 653                 sprintf(tmpbuf, "%ld", sw_status);
 654                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 655                 goto err;
 656                 }
 657         /* Convert the response */
 658         BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
 659         to_return = 1;
 660 err:
 661         if(acquired)
 662                 release_context(hac);
 663         BN_CTX_end(ctx);
 664         return to_return;
 665         }
 666
 667 #ifndef OPENSSL_NO_RSA
 668 static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
 669         {
 670         BN_CTX *ctx;
 671         int to_return = 0;
 672
 673         if((ctx = BN_CTX_new()) == NULL)
 674                 goto err;
 675         if(!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp)
 676                 {
 677                 CSWIFTerr(CSWIFT_F_CSWIFT_RSA_MOD_EXP,CSWIFT_R_MISSING_KEY_COMPONENTS);
 678                 goto err;
 679                 }
 680         to_return = cswift_mod_exp_crt(r0, I, rsa->p, rsa->q, rsa->dmp1,
 681                 rsa->dmq1, rsa->iqmp, ctx);
 682 err:
 683         if(ctx)
 684                 BN_CTX_free(ctx);
 685         return to_return;
 686         }
 687 #endif
 688
 689 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 690 static int cswift_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 691                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 692         {
 693         return cswift_mod_exp(r, a, p, m, ctx);
 694         }
 695
 696 #ifndef OPENSSL_NO_DSA
 697 static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa)
 698         {
 699         SW_CONTEXT_HANDLE hac;
 700         SW_PARAM sw_param;
 701         SW_STATUS sw_status;
 702         SW_LARGENUMBER arg, res;
 703         unsigned char *ptr;
 704         BN_CTX *ctx;
 705         BIGNUM *dsa_p = NULL;
 706         BIGNUM *dsa_q = NULL;
 707         BIGNUM *dsa_g = NULL;
 708         BIGNUM *dsa_key = NULL;
 709         BIGNUM *result = NULL;
 710         DSA_SIG *to_return = NULL;
 711         int acquired = 0;
 712
 713         if((ctx = BN_CTX_new()) == NULL)
 714                 goto err;
 715         if(!get_context(&hac))
 716                 {
 717                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_UNIT_FAILURE);
 718                 goto err;
 719                 }
 720         acquired = 1;
 721         /* Prepare the params */
 722         BN_CTX_start(ctx);
 723         dsa_p = BN_CTX_get(ctx);
 724         dsa_q = BN_CTX_get(ctx);
 725         dsa_g = BN_CTX_get(ctx);
 726         dsa_key = BN_CTX_get(ctx);
 727         result = BN_CTX_get(ctx);
 728         if(!result)
 729                 {
 730                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BN_CTX_FULL);
 731                 goto err;
 732                 }
 733         if(!bn_wexpand(dsa_p, dsa->p->top) ||
 734                         !bn_wexpand(dsa_q, dsa->q->top) ||
 735                         !bn_wexpand(dsa_g, dsa->g->top) ||
 736                         !bn_wexpand(dsa_key, dsa->priv_key->top) ||
 737                         !bn_wexpand(result, dsa->p->top))
 738                 {
 739                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BN_EXPAND_FAIL);
 740                 goto err;
 741                 }
 742         sw_param.type = SW_ALG_DSA;
 743         sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
 744                                 (unsigned char *)dsa_p->d);
 745         sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
 746         sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
 747                                 (unsigned char *)dsa_q->d);
 748         sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
 749         sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
 750                                 (unsigned char *)dsa_g->d);
 751         sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
 752         sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->priv_key,
 753                                 (unsigned char *)dsa_key->d);
 754         sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
 755         /* Attach the key params */
 756         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 757         switch(sw_status)
 758                 {
 759         case SW_OK:
 760                 break;
 761         case SW_ERR_INPUT_SIZE:
 762                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BAD_KEY_SIZE);
 763                 goto err;
 764         default:
 765                 {
 766                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 767                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_REQUEST_FAILED);
 768                 sprintf(tmpbuf, "%ld", sw_status);
 769                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 770                 }
 771                 goto err;
 772                 }
 773         /* Prepare the argument and response */
 774         arg.nbytes = dlen;
 775         arg.value = (unsigned char *)dgst;
 776         res.nbytes = BN_num_bytes(dsa->p);
 777         memset(result->d, 0, res.nbytes);
 778         res.value = (unsigned char *)result->d;
 779         /* Perform the operation */
 780         sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_SIGN, &arg, 1,
 781                 &res, 1);
 782         if(sw_status != SW_OK)
 783                 {
 784                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 785                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_REQUEST_FAILED);
 786                 sprintf(tmpbuf, "%ld", sw_status);
 787                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 788                 goto err;
 789                 }
 790         /* Convert the response */
 791         ptr = (unsigned char *)result->d;
 792         if((to_return = DSA_SIG_new()) == NULL)
 793                 goto err;
 794         to_return->r = BN_bin2bn((unsigned char *)result->d, 20, NULL);
 795         to_return->s = BN_bin2bn((unsigned char *)result->d + 20, 20, NULL);
 796
 797 err:
 798         if(acquired)
 799                 release_context(hac);
 800         if(ctx)
 801                 {
 802                 BN_CTX_end(ctx);
 803                 BN_CTX_free(ctx);
 804                 }
 805         return to_return;
 806         }
 807
 808 static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
 809                                 DSA_SIG *sig, DSA *dsa)
 810         {
 811         SW_CONTEXT_HANDLE hac;
 812         SW_PARAM sw_param;
 813         SW_STATUS sw_status;
 814         SW_LARGENUMBER arg[2], res;
 815         unsigned long sig_result;
 816         BN_CTX *ctx;
 817         BIGNUM *dsa_p = NULL;
 818         BIGNUM *dsa_q = NULL;
 819         BIGNUM *dsa_g = NULL;
 820         BIGNUM *dsa_key = NULL;
 821         BIGNUM *argument = NULL;
 822         int to_return = -1;
 823         int acquired = 0;
 824
 825         if((ctx = BN_CTX_new()) == NULL)
 826                 goto err;
 827         if(!get_context(&hac))
 828                 {
 829                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_UNIT_FAILURE);
 830                 goto err;
 831                 }
 832         acquired = 1;
 833         /* Prepare the params */
 834         BN_CTX_start(ctx);
 835         dsa_p = BN_CTX_get(ctx);
 836         dsa_q = BN_CTX_get(ctx);
 837         dsa_g = BN_CTX_get(ctx);
 838         dsa_key = BN_CTX_get(ctx);
 839         argument = BN_CTX_get(ctx);
 840         if(!argument)
 841                 {
 842                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BN_CTX_FULL);
 843                 goto err;
 844                 }
 845         if(!bn_wexpand(dsa_p, dsa->p->top) ||
 846                         !bn_wexpand(dsa_q, dsa->q->top) ||
 847                         !bn_wexpand(dsa_g, dsa->g->top) ||
 848                         !bn_wexpand(dsa_key, dsa->pub_key->top) ||
 849                         !bn_wexpand(argument, 40))
 850                 {
 851                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BN_EXPAND_FAIL);
 852                 goto err;
 853                 }
 854         sw_param.type = SW_ALG_DSA;
 855         sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
 856                                 (unsigned char *)dsa_p->d);
 857         sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
 858         sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
 859                                 (unsigned char *)dsa_q->d);
 860         sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
 861         sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
 862                                 (unsigned char *)dsa_g->d);
 863         sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
 864         sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->pub_key,
 865                                 (unsigned char *)dsa_key->d);
 866         sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
 867         /* Attach the key params */
 868         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 869         switch(sw_status)
 870                 {
 871         case SW_OK:
 872                 break;
 873         case SW_ERR_INPUT_SIZE:
 874                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BAD_KEY_SIZE);
 875                 goto err;
 876         default:
 877                 {
 878                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 879                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_REQUEST_FAILED);
 880                 sprintf(tmpbuf, "%ld", sw_status);
 881                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 882                 }
 883                 goto err;
 884                 }
 885         /* Prepare the argument and response */
 886         arg[0].nbytes = dgst_len;
 887         arg[0].value = (unsigned char *)dgst;
 888         arg[1].nbytes = 40;
 889         arg[1].value = (unsigned char *)argument->d;
 890         memset(arg[1].value, 0, 40);
 891         BN_bn2bin(sig->r, arg[1].value + 20 - BN_num_bytes(sig->r));
 892         BN_bn2bin(sig->s, arg[1].value + 40 - BN_num_bytes(sig->s));
 893         res.nbytes = 4; /* unsigned long */
 894         res.value = (unsigned char *)(&sig_result);
 895         /* Perform the operation */
 896         sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_VERIFY, arg, 2,
 897                 &res, 1);
 898         if(sw_status != SW_OK)
 899                 {
 900                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 901                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_REQUEST_FAILED);
 902                 sprintf(tmpbuf, "%ld", sw_status);
 903                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 904                 goto err;
 905                 }
 906         /* Convert the response */
 907         to_return = ((sig_result == 0) ? 0 : 1);
 908
 909 err:
 910         if(acquired)
 911                 release_context(hac);
 912         if(ctx)
 913                 {
 914                 BN_CTX_end(ctx);
 915                 BN_CTX_free(ctx);
 916                 }
 917         return to_return;
 918         }
 919 #endif
 920
 921 #ifndef OPENSSL_NO_DH
 922 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 923 static int cswift_mod_exp_dh(const DH *dh, BIGNUM *r,
 924                 const BIGNUM *a, const BIGNUM *p,
 925                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 926         {
 927         return cswift_mod_exp(r, a, p, m, ctx);
 928         }
 929 #endif
 930
 931 /* Random bytes are good */
 932 static int cswift_rand_bytes(unsigned char *buf, int num)
 933 {
 934         SW_CONTEXT_HANDLE hac;
 935         SW_STATUS swrc;
 936         SW_LARGENUMBER largenum;
 937         size_t nbytes = 0;
 938         int acquired = 0;
 939         int to_return = 0; /* assume failure */
 940
 941         if (!get_context(&hac))
 942         {
 943                 CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_UNIT_FAILURE);
 944                 goto err;
 945         }
 946         acquired = 1;
 947
 948         while (nbytes < (size_t)num)
 949         {
 950                 /* tell CryptoSwift how many bytes we want and where we want it.
 951                  * Note: - CryptoSwift cannot do more than 4096 bytes at a time.
 952                  *       - CryptoSwift can only do multiple of 32-bits. */
 953                 largenum.value = (SW_BYTE *) buf + nbytes;
 954                 if (4096 > num - nbytes)
 955                         largenum.nbytes = num - nbytes;
 956                 else
 957                         largenum.nbytes = 4096;
 958
 959                 swrc = p_CSwift_SimpleRequest(hac, SW_CMD_RAND, NULL, 0, &largenum, 1);
 960                 if (swrc != SW_OK)
 961                 {
 962                         char tmpbuf[20];
 963                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_REQUEST_FAILED);
 964                         sprintf(tmpbuf, "%ld", swrc);
 965                         ERR_add_error_data(2, "CryptoSwift error number is ", tmpbuf);
 966                         goto err;
 967                 }
 968
 969                 nbytes += largenum.nbytes;
 970         }
 971         to_return = 1;  /* success */
 972
 973 err:
 974         if (acquired)
 975                 release_context(hac);
 976         return to_return;
 977 }
 978
 979 static int cswift_rand_status(void)
 980 {
 981         return 1;
 982 }
 983
 984
 985 /* This stuff is needed if this ENGINE is being compiled into a self-contained
 986  * shared-library. */
 987 #ifndef OPENSSL_NO_DYNAMIC_ENGINE
 988 static int bind_fn(ENGINE *e, const char *id)
 989         {
 990         if(id && (strcmp(id, engine_cswift_id) != 0))
 991                 return 0;
 992         if(!bind_helper(e))
 993                 return 0;
 994         return 1;
 995         }
 996 IMPLEMENT_DYNAMIC_CHECK_FN()
 997 IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
 998 #endif /* OPENSSL_NO_DYNAMIC_ENGINE */
 999
1000 #endif /* !OPENSSL_NO_HW_CSWIFT */
1001 #endif /* !OPENSSL_NO_HW */