1 /* crypto/rsa/rsa_eay.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/bn.h>
62 #include <openssl/rsa.h>
63 #include <openssl/rand.h>
64 #include <openssl/engine.h>
68 static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
69 unsigned char *to, RSA *rsa,int padding);
70 static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
71 unsigned char *to, RSA *rsa,int padding);
72 static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
73 unsigned char *to, RSA *rsa,int padding);
74 static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
75 unsigned char *to, RSA *rsa,int padding);
76 static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *i, RSA *rsa);
77 static int RSA_eay_init(RSA *rsa);
78 static int RSA_eay_finish(RSA *rsa);
79 static RSA_METHOD rsa_pkcs1_eay_meth={
80 "Eric Young's PKCS#1 RSA",
81 RSA_eay_public_encrypt,
82 RSA_eay_public_decrypt,
83 RSA_eay_private_encrypt,
84 RSA_eay_private_decrypt,
93 RSA_METHOD *RSA_PKCS1_SSLeay(void)
95 return(&rsa_pkcs1_eay_meth);
98 static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
99 unsigned char *to, RSA *rsa, int padding)
101 const RSA_METHOD *meth;
103 int i,j,k,num=0,r= -1;
104 unsigned char *buf=NULL;
107 meth = ENGINE_get_RSA(rsa->engine);
110 if ((ctx=BN_CTX_new()) == NULL) goto err;
111 num=BN_num_bytes(rsa->n);
112 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
114 RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,ERR_R_MALLOC_FAILURE);
120 case RSA_PKCS1_PADDING:
121 i=RSA_padding_add_PKCS1_type_2(buf,num,from,flen);
124 case RSA_PKCS1_OAEP_PADDING:
125 i=RSA_padding_add_PKCS1_OAEP(buf,num,from,flen,NULL,0);
128 case RSA_SSLV23_PADDING:
129 i=RSA_padding_add_SSLv23(buf,num,from,flen);
132 i=RSA_padding_add_none(buf,num,from,flen);
135 RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
138 if (i <= 0) goto err;
140 if (BN_bin2bn(buf,num,&f) == NULL) goto err;
142 if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
144 if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
145 if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
149 if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
150 rsa->_method_mod_n)) goto err;
152 /* put in leading 0 bytes if the number is less than the
153 * length of the modulus */
154 j=BN_num_bytes(&ret);
155 i=BN_bn2bin(&ret,&(to[num-j]));
156 for (k=0; k<(num-i); k++)
161 if (ctx != NULL) BN_CTX_free(ctx);
172 static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
173 unsigned char *to, RSA *rsa, int padding)
175 const RSA_METHOD *meth;
177 int i,j,k,num=0,r= -1;
178 unsigned char *buf=NULL;
181 meth = ENGINE_get_RSA(rsa->engine);
185 if ((ctx=BN_CTX_new()) == NULL) goto err;
186 num=BN_num_bytes(rsa->n);
187 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
189 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE);
195 case RSA_PKCS1_PADDING:
196 i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen);
199 i=RSA_padding_add_none(buf,num,from,flen);
201 case RSA_SSLV23_PADDING:
203 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
206 if (i <= 0) goto err;
208 if (BN_bin2bn(buf,num,&f) == NULL) goto err;
210 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
211 RSA_blinding_on(rsa,ctx);
212 if (rsa->flags & RSA_FLAG_BLINDING)
213 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
215 if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
218 (rsa->dmp1 != NULL) &&
219 (rsa->dmq1 != NULL) &&
220 (rsa->iqmp != NULL)) )
221 { if (!meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
224 if (!meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL)) goto err;
227 if (rsa->flags & RSA_FLAG_BLINDING)
228 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
230 /* put in leading 0 bytes if the number is less than the
231 * length of the modulus */
232 j=BN_num_bytes(&ret);
233 i=BN_bn2bin(&ret,&(to[num-j]));
234 for (k=0; k<(num-i); k++)
239 if (ctx != NULL) BN_CTX_free(ctx);
250 static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
251 unsigned char *to, RSA *rsa, int padding)
253 const RSA_METHOD *meth;
257 unsigned char *buf=NULL;
260 meth = ENGINE_get_RSA(rsa->engine);
264 if (ctx == NULL) goto err;
266 num=BN_num_bytes(rsa->n);
268 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
270 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE);
274 /* This check was for equality but PGP does evil things
275 * and chops off the top '0' bytes */
278 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
282 /* make data into a big number */
283 if (BN_bin2bn(from,(int)flen,&f) == NULL) goto err;
285 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
286 RSA_blinding_on(rsa,ctx);
287 if (rsa->flags & RSA_FLAG_BLINDING)
288 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
291 if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
294 (rsa->dmp1 != NULL) &&
295 (rsa->dmq1 != NULL) &&
296 (rsa->iqmp != NULL)) )
297 { if (!meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
300 if (!meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL))
304 if (rsa->flags & RSA_FLAG_BLINDING)
305 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
308 j=BN_bn2bin(&ret,p); /* j is only used with no-padding mode */
312 case RSA_PKCS1_PADDING:
313 r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
316 case RSA_PKCS1_OAEP_PADDING:
317 r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
320 case RSA_SSLV23_PADDING:
321 r=RSA_padding_check_SSLv23(to,num,buf,j,num);
324 r=RSA_padding_check_none(to,num,buf,j,num);
327 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
331 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
334 if (ctx != NULL) BN_CTX_free(ctx);
345 static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
346 unsigned char *to, RSA *rsa, int padding)
348 const RSA_METHOD *meth;
352 unsigned char *buf=NULL;
355 meth = ENGINE_get_RSA(rsa->engine);
359 if (ctx == NULL) goto err;
361 num=BN_num_bytes(rsa->n);
362 buf=(unsigned char *)OPENSSL_malloc(num);
365 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE);
369 /* This check was for equality but PGP does evil things
370 * and chops off the top '0' bytes */
373 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
377 if (BN_bin2bn(from,flen,&f) == NULL) goto err;
379 if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
381 if ((rsa->_method_mod_n=BN_MONT_CTX_new()) != NULL)
382 if (!BN_MONT_CTX_set(rsa->_method_mod_n,rsa->n,ctx))
386 if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
387 rsa->_method_mod_n)) goto err;
394 case RSA_PKCS1_PADDING:
395 r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
398 r=RSA_padding_check_none(to,num,buf,i,num);
401 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
405 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
408 if (ctx != NULL) BN_CTX_free(ctx);
419 static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
421 const RSA_METHOD *meth;
426 meth = ENGINE_get_RSA(rsa->engine);
427 if ((ctx=BN_CTX_new()) == NULL) goto err;
431 if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
433 if (rsa->_method_mod_p == NULL)
435 if ((rsa->_method_mod_p=BN_MONT_CTX_new()) != NULL)
436 if (!BN_MONT_CTX_set(rsa->_method_mod_p,rsa->p,
440 if (rsa->_method_mod_q == NULL)
442 if ((rsa->_method_mod_q=BN_MONT_CTX_new()) != NULL)
443 if (!BN_MONT_CTX_set(rsa->_method_mod_q,rsa->q,
449 if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
450 if (!meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
451 rsa->_method_mod_q)) goto err;
453 if (!BN_mod(&r1,I,rsa->p,ctx)) goto err;
454 if (!meth->bn_mod_exp(r0,&r1,rsa->dmp1,rsa->p,ctx,
455 rsa->_method_mod_p)) goto err;
457 if (!BN_sub(r0,r0,&m1)) goto err;
458 /* This will help stop the size of r0 increasing, which does
459 * affect the multiply if it optimised for a power of 2 size */
461 if (!BN_add(r0,r0,rsa->p)) goto err;
463 if (!BN_mul(&r1,r0,rsa->iqmp,ctx)) goto err;
464 if (!BN_mod(r0,&r1,rsa->p,ctx)) goto err;
465 /* If p < q it is occasionally possible for the correction of
466 * adding 'p' if r0 is negative above to leave the result still
467 * negative. This can break the private key operations: the following
468 * second correction should *always* correct this rare occurrence.
469 * This will *never* happen with OpenSSL generated keys because
470 * they ensure p > q [steve]
473 if (!BN_add(r0,r0,rsa->p)) goto err;
474 if (!BN_mul(&r1,r0,rsa->q,ctx)) goto err;
475 if (!BN_add(r0,&r1,&m1)) goto err;
485 static int RSA_eay_init(RSA *rsa)
487 rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE;
491 static int RSA_eay_finish(RSA *rsa)
493 if (rsa->_method_mod_n != NULL)
494 BN_MONT_CTX_free(rsa->_method_mod_n);
495 if (rsa->_method_mod_p != NULL)
496 BN_MONT_CTX_free(rsa->_method_mod_p);
497 if (rsa->_method_mod_q != NULL)
498 BN_MONT_CTX_free(rsa->_method_mod_q);