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Change functions to ANSI C.
[thirdparty/openssl.git] / crypto / rsa / rsa_eay.c
CommitLineData
58964a49
RE		 1/* crypto/rsa/rsa_eay.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include "bn.h"
62#include "rsa.h"
63#include "rand.h"
64
65#ifndef NOPROTO
66static int RSA_eay_public_encrypt(int flen, unsigned char *from,
67 unsigned char *to, RSA *rsa,int padding);
68static int RSA_eay_private_encrypt(int flen, unsigned char *from,
69 unsigned char *to, RSA *rsa,int padding);
70static int RSA_eay_public_decrypt(int flen, unsigned char *from,
71 unsigned char *to, RSA *rsa,int padding);
72static int RSA_eay_private_decrypt(int flen, unsigned char *from,
73 unsigned char *to, RSA *rsa,int padding);
74static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *i, RSA *rsa);
75static int RSA_eay_init(RSA *rsa);
76static int RSA_eay_finish(RSA *rsa);
77#else
78static int RSA_eay_public_encrypt();
79static int RSA_eay_private_encrypt();
80static int RSA_eay_public_decrypt();
81static int RSA_eay_private_decrypt();
82static int RSA_eay_mod_exp();
83static int RSA_eay_init();
84static int RSA_eay_finish();
85#endif
86
87static RSA_METHOD rsa_pkcs1_eay_meth={
88 "Eric Young's PKCS#1 RSA",
89 RSA_eay_public_encrypt,
90 RSA_eay_public_decrypt,
91 RSA_eay_private_encrypt,
92 RSA_eay_private_decrypt,
93 RSA_eay_mod_exp,
94 BN_mod_exp_mont,
95 RSA_eay_init,
96 RSA_eay_finish,
97 0,
98 NULL,
99 };
100
6b691a5c 101RSA_METHOD *RSA_PKCS1_SSLeay(void)
58964a49
RE		 102 {
103 return(&rsa_pkcs1_eay_meth);
104 }
105
6b691a5c
UM		 106static int RSA_eay_public_encrypt(int flen, unsigned char *from,
107 unsigned char *to, RSA *rsa, int padding)
58964a49 108 {
dfeab068 109 BIGNUM f,ret;
58964a49
RE		 110 int i,j,k,num=0,r= -1;
111 unsigned char *buf=NULL;
112 BN_CTX *ctx=NULL;
113
dfeab068
RE		 114 BN_init(&f);
115 BN_init(&ret);
58964a49
RE		 116 if ((ctx=BN_CTX_new()) == NULL) goto err;
117 num=BN_num_bytes(rsa->n);
118 if ((buf=(unsigned char *)Malloc(num)) == NULL)
119 {
120 RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE);
121 goto err;
122 }
123
124 switch (padding)
125 {
126 case RSA_PKCS1_PADDING:
127 i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen);
128 break;
a4949896
BL		 129 case RSA_PKCS1_OAEP_PADDING:
130 i=RSA_padding_add_PKCS1_OAEP(buf,num,from,flen,NULL,0);
131 break;
58964a49
RE		 132 case RSA_SSLV23_PADDING:
133 i=RSA_padding_add_SSLv23(buf,num,from,flen);
134 break;
135 case RSA_NO_PADDING:
136 i=RSA_padding_add_none(buf,num,from,flen);
137 break;
138 default:
139 RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
140 goto err;
141 }
142 if (i <= 0) goto err;
143
dfeab068 144 if (BN_bin2bn(buf,num,&f) == NULL) goto err;
58964a49 145
03f8b042 146 if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
58964a49 147 {
03f8b042
BL		 148 if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
149 if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
150 goto err;
58964a49
RE		 151 }
152
dfeab068 153 if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
03f8b042 154 rsa->_method_mod_n)) goto err;
58964a49
RE		 155
156 /* put in leading 0 bytes if the number is less than the
157 * length of the modulus */
dfeab068
RE		 158 j=BN_num_bytes(&ret);
159 i=BN_bn2bin(&ret,&(to[num-j]));
58964a49
RE		 160 for (k=0; k<(num-i); k++)
161 to[k]=0;
162
163 r=num;
164err:
165 if (ctx != NULL) BN_CTX_free(ctx);
dfeab068
RE		 166 BN_clear_free(&f);
167 BN_clear_free(&ret);
58964a49
RE		 168 if (buf != NULL)
169 {
170 memset(buf,0,num);
171 Free(buf);
172 }
173 return(r);
174 }
175
6b691a5c
UM		 176static int RSA_eay_private_encrypt(int flen, unsigned char *from,
177 unsigned char *to, RSA *rsa, int padding)
58964a49 178 {
dfeab068 179 BIGNUM f,ret;
58964a49
RE		 180 int i,j,k,num=0,r= -1;
181 unsigned char *buf=NULL;
182 BN_CTX *ctx=NULL;
183
dfeab068
RE		 184 BN_init(&f);
185 BN_init(&ret);
186
58964a49
RE		 187 if ((ctx=BN_CTX_new()) == NULL) goto err;
188 num=BN_num_bytes(rsa->n);
189 if ((buf=(unsigned char *)Malloc(num)) == NULL)
190 {
191 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE);
192 goto err;
193 }
194
195 switch (padding)
196 {
197 case RSA_PKCS1_PADDING:
198 i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen);
199 break;
200 case RSA_NO_PADDING:
201 i=RSA_padding_add_none(buf,num,from,flen);
202 break;
203 case RSA_SSLV23_PADDING:
204 default:
205 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
206 goto err;
207 }
208 if (i <= 0) goto err;
209
dfeab068 210 if (BN_bin2bn(buf,num,&f) == NULL) goto err;
58964a49
RE		 211
212 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
213 RSA_blinding_on(rsa,ctx);
214 if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068 215 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
58964a49
RE		 216
217 if ( (rsa->p != NULL) &&
218 (rsa->q != NULL) &&
219 (rsa->dmp1 != NULL) &&
220 (rsa->dmq1 != NULL) &&
221 (rsa->iqmp != NULL))
dfeab068 222 { if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
58964a49
RE		 223 else
224 {
dfeab068 225 if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL)) goto err;
58964a49
RE		 226 }
227
228 if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068 229 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
58964a49
RE		 230
231 /* put in leading 0 bytes if the number is less than the
232 * length of the modulus */
dfeab068
RE		 233 j=BN_num_bytes(&ret);
234 i=BN_bn2bin(&ret,&(to[num-j]));
58964a49
RE		 235 for (k=0; k<(num-i); k++)
236 to[k]=0;
237
238 r=num;
239err:
240 if (ctx != NULL) BN_CTX_free(ctx);
dfeab068
RE		 241 BN_clear_free(&ret);
242 BN_clear_free(&f);
58964a49
RE		 243 if (buf != NULL)
244 {
245 memset(buf,0,num);
246 Free(buf);
247 }
248 return(r);
249 }
250
6b691a5c
UM		 251static int RSA_eay_private_decrypt(int flen, unsigned char *from,
252 unsigned char *to, RSA *rsa, int padding)
58964a49 253 {
dfeab068 254 BIGNUM f,ret;
58964a49
RE		 255 int j,num=0,r= -1;
256 unsigned char *p;
257 unsigned char *buf=NULL;
258 BN_CTX *ctx=NULL;
259
dfeab068
RE		 260 BN_init(&f);
261 BN_init(&ret);
58964a49
RE		 262 ctx=BN_CTX_new();
263 if (ctx == NULL) goto err;
264
265 num=BN_num_bytes(rsa->n);
266
267 if ((buf=(unsigned char *)Malloc(num)) == NULL)
268 {
269 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE);
270 goto err;
271 }
272
273 /* This check was for equallity but PGP does evil things
274 * and chops off the top '0' bytes */
275 if (flen > num)
276 {
277 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
278 goto err;
279 }
280
281 /* make data into a big number */
dfeab068 282 if (BN_bin2bn(from,(int)flen,&f) == NULL) goto err;
58964a49
RE		 283
284 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
285 RSA_blinding_on(rsa,ctx);
286 if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068 287 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
58964a49
RE		 288
289 /* do the decrypt */
290 if ( (rsa->p != NULL) &&
291 (rsa->q != NULL) &&
292 (rsa->dmp1 != NULL) &&
293 (rsa->dmq1 != NULL) &&
294 (rsa->iqmp != NULL))
dfeab068 295 { if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
58964a49
RE		 296 else
297 {
dfeab068 298 if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL))
58964a49
RE		 299 goto err;
300 }
301
302 if (rsa->flags & RSA_FLAG_BLINDING)
dfeab068 303 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
58964a49
RE		 304
305 p=buf;
dfeab068 306 j=BN_bn2bin(&ret,p); /* j is only used with no-padding mode */
58964a49
RE		 307
308 switch (padding)
309 {
310 case RSA_PKCS1_PADDING:
dfeab068 311 r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
58964a49 312 break;
a4949896
BL		 313 case RSA_PKCS1_OAEP_PADDING:
314 r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
315 break;
316 case RSA_SSLV23_PADDING:
dfeab068 317 r=RSA_padding_check_SSLv23(to,num,buf,j,num);
58964a49
RE		 318 break;
319 case RSA_NO_PADDING:
dfeab068 320 r=RSA_padding_check_none(to,num,buf,j,num);
58964a49
RE		 321 break;
322 default:
323 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
324 goto err;
325 }
326 if (r < 0)
327 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
328
329err:
330 if (ctx != NULL) BN_CTX_free(ctx);
dfeab068
RE		 331 BN_clear_free(&f);
332 BN_clear_free(&ret);
58964a49
RE		 333 if (buf != NULL)
334 {
335 memset(buf,0,num);
336 Free(buf);
337 }
338 return(r);
339 }
340
6b691a5c
UM		 341static int RSA_eay_public_decrypt(int flen, unsigned char *from,
342 unsigned char *to, RSA *rsa, int padding)
58964a49 343 {
dfeab068 344 BIGNUM f,ret;
58964a49
RE		 345 int i,num=0,r= -1;
346 unsigned char *p;
347 unsigned char *buf=NULL;
348 BN_CTX *ctx=NULL;
349
dfeab068
RE		 350 BN_init(&f);
351 BN_init(&ret);
58964a49
RE		 352 ctx=BN_CTX_new();
353 if (ctx == NULL) goto err;
354
355 num=BN_num_bytes(rsa->n);
356 buf=(unsigned char *)Malloc(num);
357 if (buf == NULL)
358 {
359 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE);
360 goto err;
361 }
362
363 /* This check was for equallity but PGP does evil things
364 * and chops off the top '0' bytes */
365 if (flen > num)
366 {
367 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
368 goto err;
369 }
370
dfeab068 371 if (BN_bin2bn(from,flen,&f) == NULL) goto err;
58964a49 372 /* do the decrypt */
03f8b042 373 if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
58964a49 374 {
03f8b042
BL		 375 if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
376 if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
377 goto err;
58964a49
RE		 378 }
379
dfeab068 380 if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
03f8b042 381 rsa->_method_mod_n)) goto err;
58964a49
RE		 382
383 p=buf;
dfeab068 384 i=BN_bn2bin(&ret,p);
58964a49
RE		 385
386 switch (padding)
387 {
388 case RSA_PKCS1_PADDING:
dfeab068 389 r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
58964a49
RE		 390 break;
391 case RSA_NO_PADDING:
dfeab068 392 r=RSA_padding_check_none(to,num,buf,i,num);
58964a49
RE		 393 break;
394 default:
395 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
396 goto err;
397 }
398 if (r < 0)
399 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
400
401err:
402 if (ctx != NULL) BN_CTX_free(ctx);
dfeab068
RE		 403 BN_clear_free(&f);
404 BN_clear_free(&ret);
58964a49
RE		 405 if (buf != NULL)
406 {
407 memset(buf,0,num);
408 Free(buf);
409 }
410 return(r);
411 }
412
6b691a5c 413static int RSA_eay_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
58964a49 414 {
dfeab068 415 BIGNUM r1,m1;
58964a49
RE		 416 int ret=0;
417 BN_CTX *ctx;
418
419 if ((ctx=BN_CTX_new()) == NULL) goto err;
dfeab068
RE		 420 BN_init(&m1);
421 BN_init(&r1);
58964a49
RE		 422
423 if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
424 {
03f8b042 425 if (rsa->_method_mod_p == NULL)
58964a49 426 {
03f8b042
BL		 427 if ((rsa->_method_mod_p=BN_MONT_CTX_new()) != NULL)
428 if (!BN_MONT_CTX_set(rsa->_method_mod_p,rsa->p,
429 ctx))
58964a49
RE		 430 goto err;
431 }
03f8b042 432 if (rsa->_method_mod_q == NULL)
58964a49 433 {
03f8b042
BL		 434 if ((rsa->_method_mod_q=BN_MONT_CTX_new()) != NULL)
435 if (!BN_MONT_CTX_set(rsa->_method_mod_q,rsa->q,
436 ctx))
58964a49
RE		 437 goto err;
438 }
439 }
440
dfeab068
RE		 441 if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
442 if (!rsa->meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
03f8b042 443 rsa->_method_mod_q)) goto err;
58964a49 444
dfeab068
RE		 445 if (!BN_mod(&r1,I,rsa->p,ctx)) goto err;
446 if (!rsa->meth->bn_mod_exp(r0,&r1,rsa->dmp1,rsa->p,ctx,
03f8b042 447 rsa->_method_mod_p)) goto err;
58964a49 448
dfeab068
RE		 449 if (!BN_sub(r0,r0,&m1)) goto err;
450 /* This will help stop the size of r0 increasing, which does
451 * affect the multiply if it optimised for a power of 2 size */
452 if (r0->neg)
453 if (!BN_add(r0,r0,rsa->p)) goto err;
58964a49 454
dfeab068
RE		 455 if (!BN_mul(&r1,r0,rsa->iqmp,ctx)) goto err;
456 if (!BN_mod(r0,&r1,rsa->p,ctx)) goto err;
abd4c915
DSH		 457 /* If p < q it is occasionally possible for the correction of
458 * adding 'p' if r0 is negative above to leave the result still
459 * negative. This can break the private key operations: the following
460 * second correction should *always* correct this rare occurrence.
461 * This will *never* happen with OpenSSL generated keys because
462 * they ensure p > q [steve]
463 */
464 if (r0->neg)
465 if (!BN_add(r0,r0,rsa->p)) goto err;
dfeab068
RE		 466 if (!BN_mul(&r1,r0,rsa->q,ctx)) goto err;
467 if (!BN_add(r0,&r1,&m1)) goto err;
58964a49
RE		 468
469 ret=1;
470err:
dfeab068
RE		 471 BN_clear_free(&m1);
472 BN_clear_free(&r1);
e03ddfae 473 BN_CTX_free(ctx);
58964a49
RE		 474 return(ret);
475 }
476
6b691a5c 477static int RSA_eay_init(RSA *rsa)
58964a49
RE		 478 {
479 rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE;
480 return(1);
481 }
482
6b691a5c 483static int RSA_eay_finish(RSA *rsa)
58964a49 484 {
03f8b042
BL		 485 if (rsa->_method_mod_n != NULL)
486 BN_MONT_CTX_free(rsa->_method_mod_n);
487 if (rsa->_method_mod_p != NULL)
488 BN_MONT_CTX_free(rsa->_method_mod_p);
489 if (rsa->_method_mod_q != NULL)
490 BN_MONT_CTX_free(rsa->_method_mod_q);
58964a49
RE		 491 return(1);
492 }
493
494
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