1 /* $OpenBSD: rsa_lib.c,v 1.20 2014/06/12 15:49:30 deraadt Exp $ */ 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 <openssl/crypto.h> 61 #include "cryptlib.h" 62 #include <openssl/lhash.h> 63 #include <openssl/bn.h> 64 #include <openssl/rsa.h> 65 #include <openssl/rand.h> 66 #ifndef OPENSSL_NO_ENGINE 67 #include <openssl/engine.h> 68 #endif 69 70 const char RSA_version[]="RSA" OPENSSL_VERSION_PTEXT; 71 72 static const RSA_METHOD *default_RSA_meth=NULL; 73 74 RSA *RSA_new(void) 75 { 76 RSA *r=RSA_new_method(NULL); 77 78 return r; 79 } 80 81 void RSA_set_default_method(const RSA_METHOD *meth) 82 { 83 default_RSA_meth = meth; 84 } 85 86 const RSA_METHOD *RSA_get_default_method(void) 87 { 88 if (default_RSA_meth == NULL) 89 { 90 #ifdef RSA_NULL 91 default_RSA_meth=RSA_null_method(); 92 #else 93 default_RSA_meth=RSA_PKCS1_SSLeay(); 94 #endif 95 } 96 97 return default_RSA_meth; 98 } 99 100 const RSA_METHOD *RSA_get_method(const RSA *rsa) 101 { 102 return rsa->meth; 103 } 104 105 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth) 106 { 107 /* NB: The caller is specifically setting a method, so it's not up to us 108 * to deal with which ENGINE it comes from. */ 109 const RSA_METHOD *mtmp; 110 mtmp = rsa->meth; 111 if (mtmp->finish) mtmp->finish(rsa); 112 #ifndef OPENSSL_NO_ENGINE 113 if (rsa->engine) 114 { 115 ENGINE_finish(rsa->engine); 116 rsa->engine = NULL; 117 } 118 #endif 119 rsa->meth = meth; 120 if (meth->init) meth->init(rsa); 121 return 1; 122 } 123 124 RSA *RSA_new_method(ENGINE *engine) 125 { 126 RSA *ret; 127 128 ret = malloc(sizeof(RSA)); 129 if (ret == NULL) 130 { 131 RSAerr(RSA_F_RSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 132 return NULL; 133 } 134 135 ret->meth = RSA_get_default_method(); 136 #ifndef OPENSSL_NO_ENGINE 137 if (engine) 138 { 139 if (!ENGINE_init(engine)) 140 { 141 RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB); 142 free(ret); 143 return NULL; 144 } 145 ret->engine = engine; 146 } 147 else 148 ret->engine = ENGINE_get_default_RSA(); 149 if(ret->engine) 150 { 151 ret->meth = ENGINE_get_RSA(ret->engine); 152 if(!ret->meth) 153 { 154 RSAerr(RSA_F_RSA_NEW_METHOD, 155 ERR_R_ENGINE_LIB); 156 ENGINE_finish(ret->engine); 157 free(ret); 158 return NULL; 159 } 160 } 161 #endif 162 163 ret->pad=0; 164 ret->version=0; 165 ret->n=NULL; 166 ret->e=NULL; 167 ret->d=NULL; 168 ret->p=NULL; 169 ret->q=NULL; 170 ret->dmp1=NULL; 171 ret->dmq1=NULL; 172 ret->iqmp=NULL; 173 ret->references=1; 174 ret->_method_mod_n=NULL; 175 ret->_method_mod_p=NULL; 176 ret->_method_mod_q=NULL; 177 ret->blinding=NULL; 178 ret->mt_blinding=NULL; 179 ret->bignum_data=NULL; 180 ret->flags=ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW; 181 if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) 182 { 183 #ifndef OPENSSL_NO_ENGINE 184 if (ret->engine) 185 ENGINE_finish(ret->engine); 186 #endif 187 free(ret); 188 return(NULL); 189 } 190 191 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 192 { 193 #ifndef OPENSSL_NO_ENGINE 194 if (ret->engine) 195 ENGINE_finish(ret->engine); 196 #endif 197 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data); 198 free(ret); 199 ret=NULL; 200 } 201 return(ret); 202 } 203 204 void RSA_free(RSA *r) 205 { 206 int i; 207 208 if (r == NULL) return; 209 210 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_RSA); 211 if (i > 0) return; 212 213 if (r->meth->finish) 214 r->meth->finish(r); 215 #ifndef OPENSSL_NO_ENGINE 216 if (r->engine) 217 ENGINE_finish(r->engine); 218 #endif 219 220 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data); 221 222 if (r->n != NULL) BN_clear_free(r->n); 223 if (r->e != NULL) BN_clear_free(r->e); 224 if (r->d != NULL) BN_clear_free(r->d); 225 if (r->p != NULL) BN_clear_free(r->p); 226 if (r->q != NULL) BN_clear_free(r->q); 227 if (r->dmp1 != NULL) BN_clear_free(r->dmp1); 228 if (r->dmq1 != NULL) BN_clear_free(r->dmq1); 229 if (r->iqmp != NULL) BN_clear_free(r->iqmp); 230 if (r->blinding != NULL) BN_BLINDING_free(r->blinding); 231 if (r->mt_blinding != NULL) BN_BLINDING_free(r->mt_blinding); 232 free(r->bignum_data); 233 free(r); 234 } 235 236 int RSA_up_ref(RSA *r) 237 { 238 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA); 239 return ((i > 1) ? 1 : 0); 240 } 241 242 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 243 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 244 { 245 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp, 246 new_func, dup_func, free_func); 247 } 248 249 int RSA_set_ex_data(RSA *r, int idx, void *arg) 250 { 251 return(CRYPTO_set_ex_data(&r->ex_data,idx,arg)); 252 } 253 254 void *RSA_get_ex_data(const RSA *r, int idx) 255 { 256 return(CRYPTO_get_ex_data(&r->ex_data,idx)); 257 } 258 259 int RSA_memory_lock(RSA *r) 260 { 261 int i,j,k,off; 262 char *p; 263 BIGNUM *bn,**t[6],*b; 264 BN_ULONG *ul; 265 266 if (r->d == NULL) return(1); 267 t[0]= &r->d; 268 t[1]= &r->p; 269 t[2]= &r->q; 270 t[3]= &r->dmp1; 271 t[4]= &r->dmq1; 272 t[5]= &r->iqmp; 273 k=sizeof(BIGNUM)*6; 274 off=k/sizeof(BN_ULONG)+1; 275 j=1; 276 for (i=0; i<6; i++) 277 j+= (*t[i])->top; 278 if ((p=reallocarray(NULL, (off+j), sizeof(BN_ULONG))) == NULL) 279 { 280 RSAerr(RSA_F_RSA_MEMORY_LOCK,ERR_R_MALLOC_FAILURE); 281 return(0); 282 } 283 bn=(BIGNUM *)p; 284 ul=(BN_ULONG *)&(p[off]); 285 for (i=0; i<6; i++) 286 { 287 b= *(t[i]); 288 *(t[i])= &(bn[i]); 289 memcpy((char *)&(bn[i]),(char *)b,sizeof(BIGNUM)); 290 bn[i].flags=BN_FLG_STATIC_DATA; 291 bn[i].d=ul; 292 memcpy((char *)ul,b->d,sizeof(BN_ULONG)*b->top); 293 ul+=b->top; 294 BN_clear_free(b); 295 } 296 297 /* I should fix this so it can still be done */ 298 r->flags&= ~(RSA_FLAG_CACHE_PRIVATE|RSA_FLAG_CACHE_PUBLIC); 299 300 r->bignum_data=p; 301 return(1); 302 } 303