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,
86 BN_mod_exp_mont, /* XXX probably we should not use Montgomery if e == 3 */
93 const 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);
123 #ifndef OPENSSL_NO_SHA
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 BN_MONT_CTX* bn_mont_ctx;
145 if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
147 if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->n,ctx))
149 BN_MONT_CTX_free(bn_mont_ctx);
152 if (rsa->_method_mod_n == NULL) /* other thread may have finished first */
154 CRYPTO_w_lock(CRYPTO_LOCK_RSA);
155 if (rsa->_method_mod_n == NULL)
157 rsa->_method_mod_n = bn_mont_ctx;
160 CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
163 BN_MONT_CTX_free(bn_mont_ctx);
166 if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
167 rsa->_method_mod_n)) goto err;
169 /* put in leading 0 bytes if the number is less than the
170 * length of the modulus */
171 j=BN_num_bytes(&ret);
172 i=BN_bn2bin(&ret,&(to[num-j]));
173 for (k=0; k<(num-i); k++)
178 if (ctx != NULL) BN_CTX_free(ctx);
189 static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
190 unsigned char *to, RSA *rsa, int padding)
192 const RSA_METHOD *meth;
194 int i,j,k,num=0,r= -1;
195 unsigned char *buf=NULL;
198 meth = ENGINE_get_RSA(rsa->engine);
202 if ((ctx=BN_CTX_new()) == NULL) goto err;
203 num=BN_num_bytes(rsa->n);
204 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
206 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,ERR_R_MALLOC_FAILURE);
212 case RSA_PKCS1_PADDING:
213 i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen);
216 i=RSA_padding_add_none(buf,num,from,flen);
218 case RSA_SSLV23_PADDING:
220 RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
223 if (i <= 0) goto err;
225 if (BN_bin2bn(buf,num,&f) == NULL) goto err;
227 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
228 RSA_blinding_on(rsa,ctx);
229 if (rsa->flags & RSA_FLAG_BLINDING)
230 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
232 if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
235 (rsa->dmp1 != NULL) &&
236 (rsa->dmq1 != NULL) &&
237 (rsa->iqmp != NULL)) )
238 { if (!meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
241 if (!meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL)) goto err;
244 if (rsa->flags & RSA_FLAG_BLINDING)
245 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
247 /* put in leading 0 bytes if the number is less than the
248 * length of the modulus */
249 j=BN_num_bytes(&ret);
250 i=BN_bn2bin(&ret,&(to[num-j]));
251 for (k=0; k<(num-i); k++)
256 if (ctx != NULL) BN_CTX_free(ctx);
267 static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
268 unsigned char *to, RSA *rsa, int padding)
270 const RSA_METHOD *meth;
274 unsigned char *buf=NULL;
277 meth = ENGINE_get_RSA(rsa->engine);
281 if (ctx == NULL) goto err;
283 num=BN_num_bytes(rsa->n);
285 if ((buf=(unsigned char *)OPENSSL_malloc(num)) == NULL)
287 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,ERR_R_MALLOC_FAILURE);
291 /* This check was for equality but PGP does evil things
292 * and chops off the top '0' bytes */
295 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
299 /* make data into a big number */
300 if (BN_bin2bn(from,(int)flen,&f) == NULL) goto err;
302 if ((rsa->flags & RSA_FLAG_BLINDING) && (rsa->blinding == NULL))
303 RSA_blinding_on(rsa,ctx);
304 if (rsa->flags & RSA_FLAG_BLINDING)
305 if (!BN_BLINDING_convert(&f,rsa->blinding,ctx)) goto err;
308 if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
311 (rsa->dmp1 != NULL) &&
312 (rsa->dmq1 != NULL) &&
313 (rsa->iqmp != NULL)) )
314 { if (!meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
317 if (!meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL))
321 if (rsa->flags & RSA_FLAG_BLINDING)
322 if (!BN_BLINDING_invert(&ret,rsa->blinding,ctx)) goto err;
325 j=BN_bn2bin(&ret,p); /* j is only used with no-padding mode */
329 case RSA_PKCS1_PADDING:
330 r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
332 #ifndef OPENSSL_NO_SHA
333 case RSA_PKCS1_OAEP_PADDING:
334 r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
337 case RSA_SSLV23_PADDING:
338 r=RSA_padding_check_SSLv23(to,num,buf,j,num);
341 r=RSA_padding_check_none(to,num,buf,j,num);
344 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
348 RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
351 if (ctx != NULL) BN_CTX_free(ctx);
362 static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
363 unsigned char *to, RSA *rsa, int padding)
365 const RSA_METHOD *meth;
369 unsigned char *buf=NULL;
372 meth = ENGINE_get_RSA(rsa->engine);
376 if (ctx == NULL) goto err;
378 num=BN_num_bytes(rsa->n);
379 buf=(unsigned char *)OPENSSL_malloc(num);
382 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,ERR_R_MALLOC_FAILURE);
386 /* This check was for equality but PGP does evil things
387 * and chops off the top '0' bytes */
390 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_DATA_GREATER_THAN_MOD_LEN);
394 if (BN_bin2bn(from,flen,&f) == NULL) goto err;
396 if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
398 BN_MONT_CTX* bn_mont_ctx;
399 if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
401 if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->n,ctx))
403 BN_MONT_CTX_free(bn_mont_ctx);
406 if (rsa->_method_mod_n == NULL) /* other thread may have finished first */
408 CRYPTO_w_lock(CRYPTO_LOCK_RSA);
409 if (rsa->_method_mod_n == NULL)
411 rsa->_method_mod_n = bn_mont_ctx;
414 CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
417 BN_MONT_CTX_free(bn_mont_ctx);
420 if (!meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
421 rsa->_method_mod_n)) goto err;
428 case RSA_PKCS1_PADDING:
429 r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
432 r=RSA_padding_check_none(to,num,buf,i,num);
435 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_UNKNOWN_PADDING_TYPE);
439 RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT,RSA_R_PADDING_CHECK_FAILED);
442 if (ctx != NULL) BN_CTX_free(ctx);
453 static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
455 const RSA_METHOD *meth;
460 meth = ENGINE_get_RSA(rsa->engine);
461 if ((ctx=BN_CTX_new()) == NULL) goto err;
465 if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
467 if (rsa->_method_mod_p == NULL)
469 BN_MONT_CTX* bn_mont_ctx;
470 if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
472 if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->p,ctx))
474 BN_MONT_CTX_free(bn_mont_ctx);
477 if (rsa->_method_mod_p == NULL) /* other thread may have finished first */
479 CRYPTO_w_lock(CRYPTO_LOCK_RSA);
480 if (rsa->_method_mod_p == NULL)
482 rsa->_method_mod_p = bn_mont_ctx;
485 CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
488 BN_MONT_CTX_free(bn_mont_ctx);
491 if (rsa->_method_mod_q == NULL)
493 BN_MONT_CTX* bn_mont_ctx;
494 if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
496 if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->q,ctx))
498 BN_MONT_CTX_free(bn_mont_ctx);
501 if (rsa->_method_mod_q == NULL) /* other thread may have finished first */
503 CRYPTO_w_lock(CRYPTO_LOCK_RSA);
504 if (rsa->_method_mod_q == NULL)
506 rsa->_method_mod_q = bn_mont_ctx;
509 CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
512 BN_MONT_CTX_free(bn_mont_ctx);
516 if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
517 if (!meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
518 rsa->_method_mod_q)) goto err;
520 if (!BN_mod(&r1,I,rsa->p,ctx)) goto err;
521 if (!meth->bn_mod_exp(r0,&r1,rsa->dmp1,rsa->p,ctx,
522 rsa->_method_mod_p)) goto err;
524 if (!BN_sub(r0,r0,&m1)) goto err;
525 /* This will help stop the size of r0 increasing, which does
526 * affect the multiply if it optimised for a power of 2 size */
528 if (!BN_add(r0,r0,rsa->p)) goto err;
530 if (!BN_mul(&r1,r0,rsa->iqmp,ctx)) goto err;
531 if (!BN_mod(r0,&r1,rsa->p,ctx)) goto err;
532 /* If p < q it is occasionally possible for the correction of
533 * adding 'p' if r0 is negative above to leave the result still
534 * negative. This can break the private key operations: the following
535 * second correction should *always* correct this rare occurrence.
536 * This will *never* happen with OpenSSL generated keys because
537 * they ensure p > q [steve]
540 if (!BN_add(r0,r0,rsa->p)) goto err;
541 if (!BN_mul(&r1,r0,rsa->q,ctx)) goto err;
542 if (!BN_add(r0,&r1,&m1)) goto err;
552 static int RSA_eay_init(RSA *rsa)
554 rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE;
558 static int RSA_eay_finish(RSA *rsa)
560 if (rsa->_method_mod_n != NULL)
561 BN_MONT_CTX_free(rsa->_method_mod_n);
562 if (rsa->_method_mod_p != NULL)
563 BN_MONT_CTX_free(rsa->_method_mod_p);
564 if (rsa->_method_mod_q != NULL)
565 BN_MONT_CTX_free(rsa->_method_mod_q);