1/* 2 * Copyright (c) 2000-2001,2011,2014 Apple Inc. All Rights Reserved. 3 * 4 * The contents of this file constitute Original Code as defined in and are 5 * subject to the Apple Public Source License Version 1.2 (the 'License'). 6 * You may not use this file except in compliance with the License. Please obtain 7 * a copy of the License at http://www.apple.com/publicsource and read it before 8 * using this file. 9 * 10 * This Original Code and all software distributed under the License are 11 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS 12 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT 13 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 14 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the 15 * specific language governing rights and limitations under the License. 16 */ 17 18 19/* crypto/dsa/dsa_lib.c */ 20/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 21 * All rights reserved. 22 * 23 * This package is an SSL implementation written 24 * by Eric Young (eay@cryptsoft.com). 25 * The implementation was written so as to conform with Netscapes SSL. 26 * 27 * This library is free for commercial and non-commercial use as long as 28 * the following conditions are aheared to. The following conditions 29 * apply to all code found in this distribution, be it the RC4, RSA, 30 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 31 * included with this distribution is covered by the same copyright terms 32 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 33 * 34 * Copyright remains Eric Young's, and as such any Copyright notices in 35 * the code are not to be removed. 36 * If this package is used in a product, Eric Young should be given attribution 37 * as the author of the parts of the library used. 38 * This can be in the form of a textual message at program startup or 39 * in documentation (online or textual) provided with the package. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * "This product includes cryptographic software written by 52 * Eric Young (eay@cryptsoft.com)" 53 * The word 'cryptographic' can be left out if the rouines from the library 54 * being used are not cryptographic related :-). 55 * 4. If you include any Windows specific code (or a derivative thereof) from 56 * the apps directory (application code) you must include an acknowledgement: 57 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 58 * 59 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * The licence and distribution terms for any publically available version or 72 * derivative of this code cannot be changed. i.e. this code cannot simply be 73 * copied and put under another distribution licence 74 * [including the GNU Public Licence.] 75 */ 76 77/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 78 79#include <stdio.h> 80#include "cryptlib.h" 81#include <openssl/bn.h> 82#include <openssl/dsa.h> 83#include <openssl/asn1.h> 84 85const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 86 87static const DSA_METHOD *default_DSA_method; 88static int dsa_meth_num = 0; 89static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL; 90 91void DSA_set_default_method(const DSA_METHOD *meth) 92{ 93 default_DSA_method = meth; 94} 95 96const DSA_METHOD *DSA_get_default_method(void) 97{ 98 if(!default_DSA_method) default_DSA_method = DSA_OpenSSL(); 99 return default_DSA_method; 100} 101 102DSA *DSA_new(void) 103{ 104 return DSA_new_method(NULL); 105} 106 107const DSA_METHOD *DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 108{ 109 const DSA_METHOD *mtmp; 110 mtmp = dsa->meth; 111 if (mtmp->finish) mtmp->finish(dsa); 112 dsa->meth = meth; 113 if (meth->init) meth->init(dsa); 114 return mtmp; 115} 116 117 118DSA *DSA_new_method(const DSA_METHOD *meth) 119 { 120 DSA *ret; 121 122 ret=(DSA *)Malloc(sizeof(DSA)); 123 if (ret == NULL) 124 { 125 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE); 126 return(NULL); 127 } 128 if(!default_DSA_method) default_DSA_method = DSA_OpenSSL(); 129 if(meth) ret->meth = meth; 130 else ret->meth = default_DSA_method; 131 ret->pad=0; 132 ret->version=0; 133 ret->write_params=1; 134 ret->p=NULL; 135 ret->q=NULL; 136 ret->g=NULL; 137 138 ret->pub_key=NULL; 139 ret->priv_key=NULL; 140 141 ret->kinv=NULL; 142 ret->r=NULL; 143 ret->method_mont_p=NULL; 144 145 ret->references=1; 146 ret->flags=ret->meth->flags; 147 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 148 { 149 Free(ret); 150 ret=NULL; 151 } 152 else 153 CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data); 154 155 return(ret); 156 } 157 158void DSA_free(DSA *r) 159 { 160 int i; 161 162 if (r == NULL) return; 163 164 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 165#ifdef REF_PRINT 166 REF_PRINT("DSA",r); 167#endif 168 if (i > 0) return; 169#ifdef REF_CHECK 170 if (i < 0) 171 { 172 fprintf(stderr,"DSA_free, bad reference count\n"); 173 abort(); 174 } 175#endif 176 177 CRYPTO_free_ex_data(dsa_meth, r, &r->ex_data); 178 179 if(r->meth->finish) r->meth->finish(r); 180 181 if (r->p != NULL) BN_clear_free(r->p); 182 if (r->q != NULL) BN_clear_free(r->q); 183 if (r->g != NULL) BN_clear_free(r->g); 184 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 185 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 186 if (r->kinv != NULL) BN_clear_free(r->kinv); 187 if (r->r != NULL) BN_clear_free(r->r); 188 Free(r); 189 } 190 191#ifndef _OPENSSL_APPLE_CDSA_ 192int DSA_size(DSA *r) 193 { 194 int ret,i; 195 ASN1_INTEGER bs; 196 unsigned char buf[4]; 197 198 i=BN_num_bits(r->q); 199 bs.length=(i+7)/8; 200 bs.data=buf; 201 bs.type=V_ASN1_INTEGER; 202 /* If the top bit is set the asn1 encoding is 1 larger. */ 203 buf[0]=0xff; 204 205 i=i2d_ASN1_INTEGER(&bs,NULL); 206 i+=i; /* r and s */ 207 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 208 return(ret); 209 } 210#endif /* _OPENSSL_APPLE_CDSA_ */ 211 212int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 213 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 214 { 215 dsa_meth_num++; 216 return(CRYPTO_get_ex_new_index(dsa_meth_num-1, 217 &dsa_meth,argl,argp,new_func,dup_func,free_func)); 218 } 219 220int DSA_set_ex_data(DSA *d, int idx, void *arg) 221 { 222 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 223 } 224 225void *DSA_get_ex_data(DSA *d, int idx) 226 { 227 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 228 } 229 230#ifndef NO_DH 231DH *DSA_dup_DH(DSA *r) 232 { 233 /* DSA has p, q, g, optional pub_key, optional priv_key. 234 * DH has p, optional length, g, optional pub_key, optional priv_key. 235 */ 236 237 DH *ret = NULL; 238 239 if (r == NULL) 240 goto err; 241 ret = DH_new(); 242 if (ret == NULL) 243 goto err; 244 if (r->p != NULL) 245 if ((ret->p = BN_dup(r->p)) == NULL) 246 goto err; 247 if (r->q != NULL) 248 ret->length = BN_num_bits(r->q); 249 if (r->g != NULL) 250 if ((ret->g = BN_dup(r->g)) == NULL) 251 goto err; 252 if (r->pub_key != NULL) 253 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 254 goto err; 255 if (r->priv_key != NULL) 256 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 257 goto err; 258 259 return ret; 260 261 err: 262 if (ret != NULL) 263 DH_free(ret); 264 return NULL; 265 } 266#endif 267