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