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