31b6250dd0a2e07b1fea70efc6c76caf6ebddf26
[openssl.git] / 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 */