1 /* crypto/rsa/rsa_lib.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.]
66 const char *RSA_version="RSA" OPENSSL_VERSION_PTEXT;
68 static RSA_METHOD *default_RSA_meth=NULL;
69 static int rsa_meth_num=0;
70 static STACK *rsa_meth=NULL;
74 return(RSA_new_method(NULL));
77 void RSA_set_default_method(RSA_METHOD *meth)
79 default_RSA_meth=meth;
82 RSA *RSA_new_method(RSA_METHOD *meth)
86 if (default_RSA_meth == NULL)
89 default_RSA_meth=RSA_PKCS1_RSAref();
91 default_RSA_meth=RSA_PKCS1_SSLeay();
94 ret=(RSA *)Malloc(sizeof(RSA));
97 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
102 ret->meth=default_RSA_meth;
117 ret->_method_mod_n=NULL;
118 ret->_method_mod_p=NULL;
119 ret->_method_mod_q=NULL;
121 ret->bignum_data=NULL;
122 ret->flags=ret->meth->flags;
123 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
129 CRYPTO_new_ex_data(rsa_meth,(char *)ret,&ret->ex_data);
133 void RSA_free(RSA *r)
137 if (r == NULL) return;
139 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA);
147 fprintf(stderr,"RSA_free, bad reference count\n");
152 CRYPTO_free_ex_data(rsa_meth,(char *)r,&r->ex_data);
154 if (r->meth->finish != NULL)
157 if (r->n != NULL) BN_clear_free(r->n);
158 if (r->e != NULL) BN_clear_free(r->e);
159 if (r->d != NULL) BN_clear_free(r->d);
160 if (r->p != NULL) BN_clear_free(r->p);
161 if (r->q != NULL) BN_clear_free(r->q);
162 if (r->dmp1 != NULL) BN_clear_free(r->dmp1);
163 if (r->dmq1 != NULL) BN_clear_free(r->dmq1);
164 if (r->iqmp != NULL) BN_clear_free(r->iqmp);
165 if (r->blinding != NULL) BN_BLINDING_free(r->blinding);
166 if (r->bignum_data != NULL) Free_locked(r->bignum_data);
170 int RSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
171 int (*dup_func)(), void (*free_func)())
174 return(CRYPTO_get_ex_new_index(rsa_meth_num-1,
175 &rsa_meth,argl,argp,new_func,dup_func,free_func));
178 int RSA_set_ex_data(RSA *r, int idx, char *arg)
180 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg));
183 char *RSA_get_ex_data(RSA *r, int idx)
185 return(CRYPTO_get_ex_data(&r->ex_data,idx));
190 return(BN_num_bytes(r->n));
193 int RSA_public_encrypt(int flen, unsigned char *from, unsigned char *to,
194 RSA *rsa, int padding)
196 return(rsa->meth->rsa_pub_enc(flen, from, to, rsa, padding));
199 int RSA_private_encrypt(int flen, unsigned char *from, unsigned char *to,
200 RSA *rsa, int padding)
202 return(rsa->meth->rsa_priv_enc(flen, from, to, rsa, padding));
205 int RSA_private_decrypt(int flen, unsigned char *from, unsigned char *to,
206 RSA *rsa, int padding)
208 return(rsa->meth->rsa_priv_dec(flen, from, to, rsa, padding));
211 int RSA_public_decrypt(int flen, unsigned char *from, unsigned char *to,
212 RSA *rsa, int padding)
214 return(rsa->meth->rsa_pub_dec(flen, from, to, rsa, padding));
217 int RSA_flags(RSA *r)
219 return((r == NULL)?0:r->meth->flags);
222 void RSA_blinding_off(RSA *rsa)
224 if (rsa->blinding != NULL)
226 BN_BLINDING_free(rsa->blinding);
229 rsa->flags&= ~RSA_FLAG_BLINDING;
232 int RSA_blinding_on(RSA *rsa, BN_CTX *p_ctx)
240 if ((ctx=BN_CTX_new()) == NULL) goto err;
245 if (rsa->blinding != NULL)
246 BN_BLINDING_free(rsa->blinding);
250 if (!BN_rand(A,BN_num_bits(rsa->n)-1,1,0)) goto err;
251 if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err;
253 if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n))
255 rsa->blinding=BN_BLINDING_new(A,Ai,rsa->n);
257 rsa->flags|=RSA_FLAG_BLINDING;
261 if (ctx != p_ctx) BN_CTX_free(ctx);
265 int RSA_memory_lock(RSA *r)
269 BIGNUM *bn,**t[6],*b;
272 if (r->d == NULL) return(1);
280 off=k/sizeof(BN_ULONG)+1;
284 if ((p=Malloc_locked((off+j)*sizeof(BN_ULONG))) == NULL)
286 RSAerr(RSA_F_MEMORY_LOCK,ERR_R_MALLOC_FAILURE);
290 ul=(BN_ULONG *)&(p[off]);
295 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM));
296 bn[i].flags=BN_FLG_STATIC_DATA;
298 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top);
303 /* I should fix this so it can still be done */
304 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC);