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 #include <openssl/rsa.h>
  66 #include <openssl/dsa.h>
  67 #include <openssl/dh.h>
  68 #include <openssl/rand.h>
  69
  70 #ifndef OPENSSL_NO_HW
  71 #ifndef OPENSSL_NO_HW_CSWIFT
  72
  73 /* Attribution notice: Rainbow have generously allowed me to reproduce
  74  * the necessary definitions here from their API. This means the support
  75  * can build independently of whether application builders have the
  76  * API or hardware. This will allow developers to easily produce software
  77  * that has latent hardware support for any users that have accelerators
  78  * installed, without the developers themselves needing anything extra.
  79  *
  80  * I have only clipped the parts from the CryptoSwift header files that
  81  * are (or seem) relevant to the CryptoSwift support code. This is
  82  * simply to keep the file sizes reasonable.
  83  * [Geoff]
  84  */
  85 #ifdef FLAT_INC
  86 #include "cswift.h"
  87 #else
  88 #include "vendor_defns/cswift.h"
  89 #endif
  90
  91 #define CSWIFT_LIB_NAME "cswift engine"
  92 #include "e_cswift_err.c"
  93
  94 #define DECIMAL_SIZE(type)      ((sizeof(type)*8+2)/3+1)
  95
  96 static int cswift_destroy(ENGINE *e);
  97 static int cswift_init(ENGINE *e);
  98 static int cswift_finish(ENGINE *e);
  99 static int cswift_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void));
 100
 101 /* BIGNUM stuff */
 102 static int cswift_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 103                 const BIGNUM *m, BN_CTX *ctx);
 104 static int cswift_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 105                 const BIGNUM *q, const BIGNUM *dmp1, const BIGNUM *dmq1,
 106                 const BIGNUM *iqmp, BN_CTX *ctx);
 107
 108 #ifndef OPENSSL_NO_RSA
 109 /* RSA stuff */
 110 static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
 111 #endif
 112 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 113 static int cswift_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 114                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
 115
 116 #ifndef OPENSSL_NO_DSA
 117 /* DSA stuff */
 118 static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa);
 119 static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
 120                                 DSA_SIG *sig, DSA *dsa);
 121 #endif
 122
 123 #ifndef OPENSSL_NO_DH
 124 /* DH stuff */
 125 /* This function is alised to mod_exp (with the DH and mont dropped). */
 126 static int cswift_mod_exp_dh(const DH *dh, BIGNUM *r,
 127                 const BIGNUM *a, const BIGNUM *p,
 128                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
 129 #endif
 130
 131 /* RAND stuff */
 132 static int cswift_rand_bytes(unsigned char *buf, int num);
 133 static int cswift_rand_status(void);
 134
 135 /* The definitions for control commands specific to this engine */
 136 #define CSWIFT_CMD_SO_PATH              ENGINE_CMD_BASE
 137 static const ENGINE_CMD_DEFN cswift_cmd_defns[] = {
 138         {CSWIFT_CMD_SO_PATH,
 139                 "SO_PATH",
 140                 "Specifies the path to the 'cswift' shared library",
 141                 ENGINE_CMD_FLAG_STRING},
 142         {0, NULL, NULL, 0}
 143         };
 144
 145 #ifndef OPENSSL_NO_RSA
 146 /* Our internal RSA_METHOD that we provide pointers to */
 147 static RSA_METHOD cswift_rsa =
 148         {
 149         "CryptoSwift RSA method",
 150         NULL,
 151         NULL,
 152         NULL,
 153         NULL,
 154         cswift_rsa_mod_exp,
 155         cswift_mod_exp_mont,
 156         NULL,
 157         NULL,
 158         0,
 159         NULL,
 160         NULL,
 161         NULL,
 162         NULL
 163         };
 164 #endif
 165
 166 #ifndef OPENSSL_NO_DSA
 167 /* Our internal DSA_METHOD that we provide pointers to */
 168 static DSA_METHOD cswift_dsa =
 169         {
 170         "CryptoSwift DSA method",
 171         cswift_dsa_sign,
 172         NULL, /* dsa_sign_setup */
 173         cswift_dsa_verify,
 174         NULL, /* dsa_mod_exp */
 175         NULL, /* bn_mod_exp */
 176         NULL, /* init */
 177         NULL, /* finish */
 178         0, /* flags */
 179         NULL, /* app_data */
 180         NULL, /* dsa_paramgen */
 181         NULL /* dsa_keygen */
 182         };
 183 #endif
 184
 185 #ifndef OPENSSL_NO_DH
 186 /* Our internal DH_METHOD that we provide pointers to */
 187 static DH_METHOD cswift_dh =
 188         {
 189         "CryptoSwift DH method",
 190         NULL,
 191         NULL,
 192         cswift_mod_exp_dh,
 193         NULL,
 194         NULL,
 195         0,
 196         NULL,
 197         NULL
 198         };
 199 #endif
 200
 201 static RAND_METHOD cswift_random =
 202     {
 203     /* "CryptoSwift RAND method", */
 204     NULL,
 205     cswift_rand_bytes,
 206     NULL,
 207     NULL,
 208     cswift_rand_bytes,
 209     cswift_rand_status,
 210     };
 211
 212
 213 /* Constants used when creating the ENGINE */
 214 static const char *engine_cswift_id = "cswift";
 215 static const char *engine_cswift_name = "CryptoSwift hardware engine support";
 216
 217 /* This internal function is used by ENGINE_cswift() and possibly by the
 218  * "dynamic" ENGINE support too */
 219 static int bind_helper(ENGINE *e)
 220         {
 221 #ifndef OPENSSL_NO_RSA
 222         const RSA_METHOD *meth1;
 223 #endif
 224 #ifndef OPENSSL_NO_DH
 225         const DH_METHOD *meth2;
 226 #endif
 227         if(!ENGINE_set_id(e, engine_cswift_id) ||
 228                         !ENGINE_set_name(e, engine_cswift_name) ||
 229 #ifndef OPENSSL_NO_RSA
 230                         !ENGINE_set_RSA(e, &cswift_rsa) ||
 231 #endif
 232 #ifndef OPENSSL_NO_DSA
 233                         !ENGINE_set_DSA(e, &cswift_dsa) ||
 234 #endif
 235 #ifndef OPENSSL_NO_DH
 236                         !ENGINE_set_DH(e, &cswift_dh) ||
 237 #endif
 238                         !ENGINE_set_RAND(e, &cswift_random) ||
 239                         !ENGINE_set_destroy_function(e, cswift_destroy) ||
 240                         !ENGINE_set_init_function(e, cswift_init) ||
 241                         !ENGINE_set_finish_function(e, cswift_finish) ||
 242                         !ENGINE_set_ctrl_function(e, cswift_ctrl) ||
 243                         !ENGINE_set_cmd_defns(e, cswift_cmd_defns))
 244                 return 0;
 245
 246 #ifndef OPENSSL_NO_RSA
 247         /* We know that the "PKCS1_SSLeay()" functions hook properly
 248          * to the cswift-specific mod_exp and mod_exp_crt so we use
 249          * those functions. NB: We don't use ENGINE_openssl() or
 250          * anything "more generic" because something like the RSAref
 251          * code may not hook properly, and if you own one of these
 252          * cards then you have the right to do RSA operations on it
 253          * anyway! */
 254         meth1 = RSA_PKCS1_SSLeay();
 255         cswift_rsa.rsa_pub_enc = meth1->rsa_pub_enc;
 256         cswift_rsa.rsa_pub_dec = meth1->rsa_pub_dec;
 257         cswift_rsa.rsa_priv_enc = meth1->rsa_priv_enc;
 258         cswift_rsa.rsa_priv_dec = meth1->rsa_priv_dec;
 259 #endif
 260
 261 #ifndef OPENSSL_NO_DH
 262         /* Much the same for Diffie-Hellman */
 263         meth2 = DH_OpenSSL();
 264         cswift_dh.generate_key = meth2->generate_key;
 265         cswift_dh.compute_key = meth2->compute_key;
 266 #endif
 267
 268         /* Ensure the cswift error handling is set up */
 269         ERR_load_CSWIFT_strings();
 270         return 1;
 271         }
 272
 273 #ifdef OPENSSL_NO_DYNAMIC_ENGINE
 274 static ENGINE *engine_cswift(void)
 275         {
 276         ENGINE *ret = ENGINE_new();
 277         if(!ret)
 278                 return NULL;
 279         if(!bind_helper(ret))
 280                 {
 281                 ENGINE_free(ret);
 282                 return NULL;
 283                 }
 284         return ret;
 285         }
 286
 287 void ENGINE_load_cswift(void)
 288         {
 289         /* Copied from eng_[openssl|dyn].c */
 290         ENGINE *toadd = engine_cswift();
 291         if(!toadd) return;
 292         ENGINE_add(toadd);
 293         ENGINE_free(toadd);
 294         ERR_clear_error();
 295         }
 296 #endif
 297
 298 /* This is a process-global DSO handle used for loading and unloading
 299  * the CryptoSwift library. NB: This is only set (or unset) during an
 300  * init() or finish() call (reference counts permitting) and they're
 301  * operating with global locks, so this should be thread-safe
 302  * implicitly. */
 303 static DSO *cswift_dso = NULL;
 304
 305 /* These are the function pointers that are (un)set when the library has
 306  * successfully (un)loaded. */
 307 t_swAcquireAccContext *p_CSwift_AcquireAccContext = NULL;
 308 t_swAttachKeyParam *p_CSwift_AttachKeyParam = NULL;
 309 t_swSimpleRequest *p_CSwift_SimpleRequest = NULL;
 310 t_swReleaseAccContext *p_CSwift_ReleaseAccContext = NULL;
 311
 312 /* Used in the DSO operations. */
 313 static const char *CSWIFT_LIBNAME = NULL;
 314 static const char *get_CSWIFT_LIBNAME(void)
 315         {
 316         if(CSWIFT_LIBNAME)
 317                 return CSWIFT_LIBNAME;
 318         return "swift";
 319         }
 320 static void free_CSWIFT_LIBNAME(void)
 321         {
 322         if(CSWIFT_LIBNAME)
 323                 OPENSSL_free((void*)CSWIFT_LIBNAME);
 324         CSWIFT_LIBNAME = NULL;
 325         }
 326 static long set_CSWIFT_LIBNAME(const char *name)
 327         {
 328         free_CSWIFT_LIBNAME();
 329         return (((CSWIFT_LIBNAME = BUF_strdup(name)) != NULL) ? 1 : 0);
 330         }
 331 static const char *CSWIFT_F1 = "swAcquireAccContext";
 332 static const char *CSWIFT_F2 = "swAttachKeyParam";
 333 static const char *CSWIFT_F3 = "swSimpleRequest";
 334 static const char *CSWIFT_F4 = "swReleaseAccContext";
 335
 336
 337 /* CryptoSwift library functions and mechanics - these are used by the
 338  * higher-level functions further down. NB: As and where there's no
 339  * error checking, take a look lower down where these functions are
 340  * called, the checking and error handling is probably down there. */
 341
 342 /* utility function to obtain a context */
 343 static int get_context(SW_CONTEXT_HANDLE *hac)
 344         {
 345         SW_STATUS status;
 346
 347         status = p_CSwift_AcquireAccContext(hac);
 348         if(status != SW_OK)
 349                 return 0;
 350         return 1;
 351         }
 352
 353 /* similarly to release one. */
 354 static void release_context(SW_CONTEXT_HANDLE hac)
 355         {
 356         p_CSwift_ReleaseAccContext(hac);
 357         }
 358
 359 /* Destructor (complements the "ENGINE_cswift()" constructor) */
 360 static int cswift_destroy(ENGINE *e)
 361         {
 362         free_CSWIFT_LIBNAME();
 363         ERR_unload_CSWIFT_strings();
 364         return 1;
 365         }
 366
 367 /* (de)initialisation functions. */
 368 static int cswift_init(ENGINE *e)
 369         {
 370         SW_CONTEXT_HANDLE hac;
 371         t_swAcquireAccContext *p1;
 372         t_swAttachKeyParam *p2;
 373         t_swSimpleRequest *p3;
 374         t_swReleaseAccContext *p4;
 375
 376         if(cswift_dso != NULL)
 377                 {
 378                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_ALREADY_LOADED);
 379                 goto err;
 380                 }
 381         /* Attempt to load libswift.so/swift.dll/whatever. */
 382         cswift_dso = DSO_load(NULL, get_CSWIFT_LIBNAME(), NULL, 0);
 383         if(cswift_dso == NULL)
 384                 {
 385                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
 386                 goto err;
 387                 }
 388         if(!(p1 = (t_swAcquireAccContext *)
 389                                 DSO_bind_func(cswift_dso, CSWIFT_F1)) ||
 390                         !(p2 = (t_swAttachKeyParam *)
 391                                 DSO_bind_func(cswift_dso, CSWIFT_F2)) ||
 392                         !(p3 = (t_swSimpleRequest *)
 393                                 DSO_bind_func(cswift_dso, CSWIFT_F3)) ||
 394                         !(p4 = (t_swReleaseAccContext *)
 395                                 DSO_bind_func(cswift_dso, CSWIFT_F4)))
 396                 {
 397                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_NOT_LOADED);
 398                 goto err;
 399                 }
 400         /* Copy the pointers */
 401         p_CSwift_AcquireAccContext = p1;
 402         p_CSwift_AttachKeyParam = p2;
 403         p_CSwift_SimpleRequest = p3;
 404         p_CSwift_ReleaseAccContext = p4;
 405         /* Try and get a context - if not, we may have a DSO but no
 406          * accelerator! */
 407         if(!get_context(&hac))
 408                 {
 409                 CSWIFTerr(CSWIFT_F_CSWIFT_INIT,CSWIFT_R_UNIT_FAILURE);
 410                 goto err;
 411                 }
 412         release_context(hac);
 413         /* Everything's fine. */
 414         return 1;
 415 err:
 416         if(cswift_dso)
 417                 DSO_free(cswift_dso);
 418         p_CSwift_AcquireAccContext = NULL;
 419         p_CSwift_AttachKeyParam = NULL;
 420         p_CSwift_SimpleRequest = NULL;
 421         p_CSwift_ReleaseAccContext = NULL;
 422         return 0;
 423         }
 424
 425 static int cswift_finish(ENGINE *e)
 426         {
 427         free_CSWIFT_LIBNAME();
 428         if(cswift_dso == NULL)
 429                 {
 430                 CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_NOT_LOADED);
 431                 return 0;
 432                 }
 433         if(!DSO_free(cswift_dso))
 434                 {
 435                 CSWIFTerr(CSWIFT_F_CSWIFT_FINISH,CSWIFT_R_UNIT_FAILURE);
 436                 return 0;
 437                 }
 438         cswift_dso = NULL;
 439         p_CSwift_AcquireAccContext = NULL;
 440         p_CSwift_AttachKeyParam = NULL;
 441         p_CSwift_SimpleRequest = NULL;
 442         p_CSwift_ReleaseAccContext = NULL;
 443         return 1;
 444         }
 445
 446 static int cswift_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
 447         {
 448         int initialised = ((cswift_dso == NULL) ? 0 : 1);
 449         switch(cmd)
 450                 {
 451         case CSWIFT_CMD_SO_PATH:
 452                 if(p == NULL)
 453                         {
 454                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,ERR_R_PASSED_NULL_PARAMETER);
 455                         return 0;
 456                         }
 457                 if(initialised)
 458                         {
 459                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_ALREADY_LOADED);
 460                         return 0;
 461                         }
 462                 return set_CSWIFT_LIBNAME((const char *)p);
 463         default:
 464                 break;
 465                 }
 466         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL,CSWIFT_R_CTRL_COMMAND_NOT_IMPLEMENTED);
 467         return 0;
 468         }
 469
 470 /* Un petit mod_exp */
 471 static int cswift_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 472                         const BIGNUM *m, BN_CTX *ctx)
 473         {
 474         /* I need somewhere to store temporary serialised values for
 475          * use with the CryptoSwift API calls. A neat cheat - I'll use
 476          * BIGNUMs from the BN_CTX but access their arrays directly as
 477          * byte arrays <grin>. This way I don't have to clean anything
 478          * up. */
 479         BIGNUM *modulus;
 480         BIGNUM *exponent;
 481         BIGNUM *argument;
 482         BIGNUM *result;
 483         SW_STATUS sw_status;
 484         SW_LARGENUMBER arg, res;
 485         SW_PARAM sw_param;
 486         SW_CONTEXT_HANDLE hac;
 487         int to_return, acquired;
 488
 489         modulus = exponent = argument = result = NULL;
 490         to_return = 0; /* expect failure */
 491         acquired = 0;
 492
 493         if(!get_context(&hac))
 494                 {
 495                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_UNIT_FAILURE);
 496                 goto err;
 497                 }
 498         acquired = 1;
 499         /* Prepare the params */
 500         BN_CTX_start(ctx);
 501         modulus = BN_CTX_get(ctx);
 502         exponent = BN_CTX_get(ctx);
 503         argument = BN_CTX_get(ctx);
 504         result = BN_CTX_get(ctx);
 505         if(!result)
 506                 {
 507                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_CTX_FULL);
 508                 goto err;
 509                 }
 510         if(!bn_wexpand(modulus, m->top) || !bn_wexpand(exponent, p->top) ||
 511                 !bn_wexpand(argument, a->top) || !bn_wexpand(result, m->top))
 512                 {
 513                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BN_EXPAND_FAIL);
 514                 goto err;
 515                 }
 516         sw_param.type = SW_ALG_EXP;
 517         sw_param.up.exp.modulus.nbytes = BN_bn2bin(m,
 518                 (unsigned char *)modulus->d);
 519         sw_param.up.exp.modulus.value = (unsigned char *)modulus->d;
 520         sw_param.up.exp.exponent.nbytes = BN_bn2bin(p,
 521                 (unsigned char *)exponent->d);
 522         sw_param.up.exp.exponent.value = (unsigned char *)exponent->d;
 523         /* Attach the key params */
 524         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 525         switch(sw_status)
 526                 {
 527         case SW_OK:
 528                 break;
 529         case SW_ERR_INPUT_SIZE:
 530                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_BAD_KEY_SIZE);
 531                 goto err;
 532         default:
 533                 {
 534                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 535                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
 536                 sprintf(tmpbuf, "%ld", sw_status);
 537                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 538                 }
 539                 goto err;
 540                 }
 541         /* Prepare the argument and response */
 542         arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
 543         arg.value = (unsigned char *)argument->d;
 544         res.nbytes = BN_num_bytes(m);
 545         memset(result->d, 0, res.nbytes);
 546         res.value = (unsigned char *)result->d;
 547         /* Perform the operation */
 548         if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP, &arg, 1,
 549                 &res, 1)) != SW_OK)
 550                 {
 551                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 552                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP,CSWIFT_R_REQUEST_FAILED);
 553                 sprintf(tmpbuf, "%ld", sw_status);
 554                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 555                 goto err;
 556                 }
 557         /* Convert the response */
 558         BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
 559         to_return = 1;
 560 err:
 561         if(acquired)
 562                 release_context(hac);
 563         BN_CTX_end(ctx);
 564         return to_return;
 565         }
 566
 567 /* Un petit mod_exp chinois */
 568 static int cswift_mod_exp_crt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 569                         const BIGNUM *q, const BIGNUM *dmp1,
 570                         const BIGNUM *dmq1, const BIGNUM *iqmp, BN_CTX *ctx)
 571         {
 572         SW_STATUS sw_status;
 573         SW_LARGENUMBER arg, res;
 574         SW_PARAM sw_param;
 575         SW_CONTEXT_HANDLE hac;
 576         BIGNUM *rsa_p = NULL;
 577         BIGNUM *rsa_q = NULL;
 578         BIGNUM *rsa_dmp1 = NULL;
 579         BIGNUM *rsa_dmq1 = NULL;
 580         BIGNUM *rsa_iqmp = NULL;
 581         BIGNUM *argument = NULL;
 582         BIGNUM *result = NULL;
 583         int to_return = 0; /* expect failure */
 584         int acquired = 0;
 585
 586         if(!get_context(&hac))
 587                 {
 588                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_UNIT_FAILURE);
 589                 goto err;
 590                 }
 591         acquired = 1;
 592         /* Prepare the params */
 593         BN_CTX_start(ctx);
 594         rsa_p = BN_CTX_get(ctx);
 595         rsa_q = BN_CTX_get(ctx);
 596         rsa_dmp1 = BN_CTX_get(ctx);
 597         rsa_dmq1 = BN_CTX_get(ctx);
 598         rsa_iqmp = BN_CTX_get(ctx);
 599         argument = BN_CTX_get(ctx);
 600         result = BN_CTX_get(ctx);
 601         if(!result)
 602                 {
 603                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_CTX_FULL);
 604                 goto err;
 605                 }
 606         if(!bn_wexpand(rsa_p, p->top) || !bn_wexpand(rsa_q, q->top) ||
 607                         !bn_wexpand(rsa_dmp1, dmp1->top) ||
 608                         !bn_wexpand(rsa_dmq1, dmq1->top) ||
 609                         !bn_wexpand(rsa_iqmp, iqmp->top) ||
 610                         !bn_wexpand(argument, a->top) ||
 611                         !bn_wexpand(result, p->top + q->top))
 612                 {
 613                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BN_EXPAND_FAIL);
 614                 goto err;
 615                 }
 616         sw_param.type = SW_ALG_CRT;
 617         sw_param.up.crt.p.nbytes = BN_bn2bin(p, (unsigned char *)rsa_p->d);
 618         sw_param.up.crt.p.value = (unsigned char *)rsa_p->d;
 619         sw_param.up.crt.q.nbytes = BN_bn2bin(q, (unsigned char *)rsa_q->d);
 620         sw_param.up.crt.q.value = (unsigned char *)rsa_q->d;
 621         sw_param.up.crt.dmp1.nbytes = BN_bn2bin(dmp1,
 622                 (unsigned char *)rsa_dmp1->d);
 623         sw_param.up.crt.dmp1.value = (unsigned char *)rsa_dmp1->d;
 624         sw_param.up.crt.dmq1.nbytes = BN_bn2bin(dmq1,
 625                 (unsigned char *)rsa_dmq1->d);
 626         sw_param.up.crt.dmq1.value = (unsigned char *)rsa_dmq1->d;
 627         sw_param.up.crt.iqmp.nbytes = BN_bn2bin(iqmp,
 628                 (unsigned char *)rsa_iqmp->d);
 629         sw_param.up.crt.iqmp.value = (unsigned char *)rsa_iqmp->d;
 630         /* Attach the key params */
 631         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 632         switch(sw_status)
 633                 {
 634         case SW_OK:
 635                 break;
 636         case SW_ERR_INPUT_SIZE:
 637                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_BAD_KEY_SIZE);
 638                 goto err;
 639         default:
 640                 {
 641                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 642                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
 643                 sprintf(tmpbuf, "%ld", sw_status);
 644                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 645                 }
 646                 goto err;
 647                 }
 648         /* Prepare the argument and response */
 649         arg.nbytes = BN_bn2bin(a, (unsigned char *)argument->d);
 650         arg.value = (unsigned char *)argument->d;
 651         res.nbytes = 2 * BN_num_bytes(p);
 652         memset(result->d, 0, res.nbytes);
 653         res.value = (unsigned char *)result->d;
 654         /* Perform the operation */
 655         if((sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_MODEXP_CRT, &arg, 1,
 656                 &res, 1)) != SW_OK)
 657                 {
 658                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 659                 CSWIFTerr(CSWIFT_F_CSWIFT_MOD_EXP_CRT,CSWIFT_R_REQUEST_FAILED);
 660                 sprintf(tmpbuf, "%ld", sw_status);
 661                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 662                 goto err;
 663                 }
 664         /* Convert the response */
 665         BN_bin2bn((unsigned char *)result->d, res.nbytes, r);
 666         to_return = 1;
 667 err:
 668         if(acquired)
 669                 release_context(hac);
 670         BN_CTX_end(ctx);
 671         return to_return;
 672         }
 673
 674 #ifndef OPENSSL_NO_RSA
 675 static int cswift_rsa_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
 676         {
 677         int to_return = 0;
 678
 679         if(!rsa->p || !rsa->q || !rsa->dmp1 || !rsa->dmq1 || !rsa->iqmp)
 680                 {
 681                 CSWIFTerr(CSWIFT_F_CSWIFT_RSA_MOD_EXP,CSWIFT_R_MISSING_KEY_COMPONENTS);
 682                 goto err;
 683                 }
 684         to_return = cswift_mod_exp_crt(r0, I, rsa->p, rsa->q, rsa->dmp1,
 685                 rsa->dmq1, rsa->iqmp, ctx);
 686 err:
 687         return to_return;
 688         }
 689 #endif
 690
 691 /* This function is aliased to mod_exp (with the mont stuff dropped). */
 692 static int cswift_mod_exp_mont(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
 693                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 694         {
 695         return cswift_mod_exp(r, a, p, m, ctx);
 696         }
 697
 698 #ifndef OPENSSL_NO_DSA
 699 static DSA_SIG *cswift_dsa_sign(const unsigned char *dgst, int dlen, DSA *dsa)
 700         {
 701         SW_CONTEXT_HANDLE hac;
 702         SW_PARAM sw_param;
 703         SW_STATUS sw_status;
 704         SW_LARGENUMBER arg, res;
 705         unsigned char *ptr;
 706         BN_CTX *ctx;
 707         BIGNUM *dsa_p = NULL;
 708         BIGNUM *dsa_q = NULL;
 709         BIGNUM *dsa_g = NULL;
 710         BIGNUM *dsa_key = NULL;
 711         BIGNUM *result = NULL;
 712         DSA_SIG *to_return = NULL;
 713         int acquired = 0;
 714
 715         if((ctx = BN_CTX_new()) == NULL)
 716                 goto err;
 717         if(!get_context(&hac))
 718                 {
 719                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_UNIT_FAILURE);
 720                 goto err;
 721                 }
 722         acquired = 1;
 723         /* Prepare the params */
 724         BN_CTX_start(ctx);
 725         dsa_p = BN_CTX_get(ctx);
 726         dsa_q = BN_CTX_get(ctx);
 727         dsa_g = BN_CTX_get(ctx);
 728         dsa_key = BN_CTX_get(ctx);
 729         result = BN_CTX_get(ctx);
 730         if(!result)
 731                 {
 732                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BN_CTX_FULL);
 733                 goto err;
 734                 }
 735         if(!bn_wexpand(dsa_p, dsa->p->top) ||
 736                         !bn_wexpand(dsa_q, dsa->q->top) ||
 737                         !bn_wexpand(dsa_g, dsa->g->top) ||
 738                         !bn_wexpand(dsa_key, dsa->priv_key->top) ||
 739                         !bn_wexpand(result, dsa->p->top))
 740                 {
 741                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BN_EXPAND_FAIL);
 742                 goto err;
 743                 }
 744         sw_param.type = SW_ALG_DSA;
 745         sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
 746                                 (unsigned char *)dsa_p->d);
 747         sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
 748         sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
 749                                 (unsigned char *)dsa_q->d);
 750         sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
 751         sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
 752                                 (unsigned char *)dsa_g->d);
 753         sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
 754         sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->priv_key,
 755                                 (unsigned char *)dsa_key->d);
 756         sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
 757         /* Attach the key params */
 758         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 759         switch(sw_status)
 760                 {
 761         case SW_OK:
 762                 break;
 763         case SW_ERR_INPUT_SIZE:
 764                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_BAD_KEY_SIZE);
 765                 goto err;
 766         default:
 767                 {
 768                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 769                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_REQUEST_FAILED);
 770                 sprintf(tmpbuf, "%ld", sw_status);
 771                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 772                 }
 773                 goto err;
 774                 }
 775         /* Prepare the argument and response */
 776         arg.nbytes = dlen;
 777         arg.value = (unsigned char *)dgst;
 778         res.nbytes = BN_num_bytes(dsa->p);
 779         memset(result->d, 0, res.nbytes);
 780         res.value = (unsigned char *)result->d;
 781         /* Perform the operation */
 782         sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_SIGN, &arg, 1,
 783                 &res, 1);
 784         if(sw_status != SW_OK)
 785                 {
 786                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 787                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_SIGN,CSWIFT_R_REQUEST_FAILED);
 788                 sprintf(tmpbuf, "%ld", sw_status);
 789                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 790                 goto err;
 791                 }
 792         /* Convert the response */
 793         ptr = (unsigned char *)result->d;
 794         if((to_return = DSA_SIG_new()) == NULL)
 795                 goto err;
 796         to_return->r = BN_bin2bn((unsigned char *)result->d, 20, NULL);
 797         to_return->s = BN_bin2bn((unsigned char *)result->d + 20, 20, NULL);
 798
 799 err:
 800         if(acquired)
 801                 release_context(hac);
 802         if(ctx)
 803                 {
 804                 BN_CTX_end(ctx);
 805                 BN_CTX_free(ctx);
 806                 }
 807         return to_return;
 808         }
 809
 810 static int cswift_dsa_verify(const unsigned char *dgst, int dgst_len,
 811                                 DSA_SIG *sig, DSA *dsa)
 812         {
 813         SW_CONTEXT_HANDLE hac;
 814         SW_PARAM sw_param;
 815         SW_STATUS sw_status;
 816         SW_LARGENUMBER arg[2], res;
 817         unsigned long sig_result;
 818         BN_CTX *ctx;
 819         BIGNUM *dsa_p = NULL;
 820         BIGNUM *dsa_q = NULL;
 821         BIGNUM *dsa_g = NULL;
 822         BIGNUM *dsa_key = NULL;
 823         BIGNUM *argument = NULL;
 824         int to_return = -1;
 825         int acquired = 0;
 826
 827         if((ctx = BN_CTX_new()) == NULL)
 828                 goto err;
 829         if(!get_context(&hac))
 830                 {
 831                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_UNIT_FAILURE);
 832                 goto err;
 833                 }
 834         acquired = 1;
 835         /* Prepare the params */
 836         BN_CTX_start(ctx);
 837         dsa_p = BN_CTX_get(ctx);
 838         dsa_q = BN_CTX_get(ctx);
 839         dsa_g = BN_CTX_get(ctx);
 840         dsa_key = BN_CTX_get(ctx);
 841         argument = BN_CTX_get(ctx);
 842         if(!argument)
 843                 {
 844                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BN_CTX_FULL);
 845                 goto err;
 846                 }
 847         if(!bn_wexpand(dsa_p, dsa->p->top) ||
 848                         !bn_wexpand(dsa_q, dsa->q->top) ||
 849                         !bn_wexpand(dsa_g, dsa->g->top) ||
 850                         !bn_wexpand(dsa_key, dsa->pub_key->top) ||
 851                         !bn_wexpand(argument, 40))
 852                 {
 853                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BN_EXPAND_FAIL);
 854                 goto err;
 855                 }
 856         sw_param.type = SW_ALG_DSA;
 857         sw_param.up.dsa.p.nbytes = BN_bn2bin(dsa->p,
 858                                 (unsigned char *)dsa_p->d);
 859         sw_param.up.dsa.p.value = (unsigned char *)dsa_p->d;
 860         sw_param.up.dsa.q.nbytes = BN_bn2bin(dsa->q,
 861                                 (unsigned char *)dsa_q->d);
 862         sw_param.up.dsa.q.value = (unsigned char *)dsa_q->d;
 863         sw_param.up.dsa.g.nbytes = BN_bn2bin(dsa->g,
 864                                 (unsigned char *)dsa_g->d);
 865         sw_param.up.dsa.g.value = (unsigned char *)dsa_g->d;
 866         sw_param.up.dsa.key.nbytes = BN_bn2bin(dsa->pub_key,
 867                                 (unsigned char *)dsa_key->d);
 868         sw_param.up.dsa.key.value = (unsigned char *)dsa_key->d;
 869         /* Attach the key params */
 870         sw_status = p_CSwift_AttachKeyParam(hac, &sw_param);
 871         switch(sw_status)
 872                 {
 873         case SW_OK:
 874                 break;
 875         case SW_ERR_INPUT_SIZE:
 876                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_BAD_KEY_SIZE);
 877                 goto err;
 878         default:
 879                 {
 880                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 881                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_REQUEST_FAILED);
 882                 sprintf(tmpbuf, "%ld", sw_status);
 883                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 884                 }
 885                 goto err;
 886                 }
 887         /* Prepare the argument and response */
 888         arg[0].nbytes = dgst_len;
 889         arg[0].value = (unsigned char *)dgst;
 890         arg[1].nbytes = 40;
 891         arg[1].value = (unsigned char *)argument->d;
 892         memset(arg[1].value, 0, 40);
 893         BN_bn2bin(sig->r, arg[1].value + 20 - BN_num_bytes(sig->r));
 894         BN_bn2bin(sig->s, arg[1].value + 40 - BN_num_bytes(sig->s));
 895         res.nbytes = 4; /* unsigned long */
 896         res.value = (unsigned char *)(&sig_result);
 897         /* Perform the operation */
 898         sw_status = p_CSwift_SimpleRequest(hac, SW_CMD_DSS_VERIFY, arg, 2,
 899                 &res, 1);
 900         if(sw_status != SW_OK)
 901                 {
 902                 char tmpbuf[DECIMAL_SIZE(sw_status)+1];
 903                 CSWIFTerr(CSWIFT_F_CSWIFT_DSA_VERIFY,CSWIFT_R_REQUEST_FAILED);
 904                 sprintf(tmpbuf, "%ld", sw_status);
 905                 ERR_add_error_data(2, "CryptoSwift error number is ",tmpbuf);
 906                 goto err;
 907                 }
 908         /* Convert the response */
 909         to_return = ((sig_result == 0) ? 0 : 1);
 910
 911 err:
 912         if(acquired)
 913                 release_context(hac);
 914         if(ctx)
 915                 {
 916                 BN_CTX_end(ctx);
 917                 BN_CTX_free(ctx);
 918                 }
 919         return to_return;
 920         }
 921 #endif
 922
 923 #ifndef OPENSSL_NO_DH
 924 /* This function is aliased to mod_exp (with the dh and mont dropped). */
 925 static int cswift_mod_exp_dh(const DH *dh, BIGNUM *r,
 926                 const BIGNUM *a, const BIGNUM *p,
 927                 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx)
 928         {
 929         return cswift_mod_exp(r, a, p, m, ctx);
 930         }
 931 #endif
 932
 933 /* Random bytes are good */
 934 static int cswift_rand_bytes(unsigned char *buf, int num)
 935 {
 936         SW_CONTEXT_HANDLE hac;
 937         SW_STATUS swrc;
 938         SW_LARGENUMBER largenum;
 939         size_t nbytes = 0;
 940         int acquired = 0;
 941         int to_return = 0; /* assume failure */
 942
 943         if (!get_context(&hac))
 944         {
 945                 CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_UNIT_FAILURE);
 946                 goto err;
 947         }
 948         acquired = 1;
 949
 950         while (nbytes < (size_t)num)
 951         {
 952                 /* tell CryptoSwift how many bytes we want and where we want it.
 953                  * Note: - CryptoSwift cannot do more than 4096 bytes at a time.
 954                  *       - CryptoSwift can only do multiple of 32-bits. */
 955                 largenum.value = (SW_BYTE *) buf + nbytes;
 956                 if (4096 > num - nbytes)
 957                         largenum.nbytes = num - nbytes;
 958                 else
 959                         largenum.nbytes = 4096;
 960
 961                 swrc = p_CSwift_SimpleRequest(hac, SW_CMD_RAND, NULL, 0, &largenum, 1);
 962                 if (swrc != SW_OK)
 963                 {
 964                         char tmpbuf[20];
 965                         CSWIFTerr(CSWIFT_F_CSWIFT_CTRL, CSWIFT_R_REQUEST_FAILED);
 966                         sprintf(tmpbuf, "%ld", swrc);
 967                         ERR_add_error_data(2, "CryptoSwift error number is ", tmpbuf);
 968                         goto err;
 969                 }
 970
 971                 nbytes += largenum.nbytes;
 972         }
 973         to_return = 1;  /* success */
 974
 975 err:
 976         if (acquired)
 977                 release_context(hac);
 978         return to_return;
 979 }
 980
 981 static int cswift_rand_status(void)
 982 {
 983         return 1;
 984 }
 985
 986
 987 /* This stuff is needed if this ENGINE is being compiled into a self-contained
 988  * shared-library. */
 989 #ifndef OPENSSL_NO_DYNAMIC_ENGINE
 990 static int bind_fn(ENGINE *e, const char *id)
 991         {
 992         if(id && (strcmp(id, engine_cswift_id) != 0))
 993                 return 0;
 994         if(!bind_helper(e))
 995                 return 0;
 996         return 1;
 997         }
 998 IMPLEMENT_DYNAMIC_CHECK_FN()
 999 IMPLEMENT_DYNAMIC_BIND_FN(bind_fn)
1000 #endif /* OPENSSL_NO_DYNAMIC_ENGINE */
1001
1002 #endif /* !OPENSSL_NO_HW_CSWIFT */
1003 #endif /* !OPENSSL_NO_HW */