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