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