dsa_lib.c revision 76866
1/* crypto/dsa/dsa_lib.c */ 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/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 60 61#include <stdio.h> 62#include "cryptlib.h" 63#include <openssl/bn.h> 64#include <openssl/dsa.h> 65#include <openssl/asn1.h> 66 67const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 68 69static DSA_METHOD *default_DSA_method; 70static int dsa_meth_num = 0; 71static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dsa_meth = NULL; 72 73void DSA_set_default_method(DSA_METHOD *meth) 74{ 75 default_DSA_method = meth; 76} 77 78DSA_METHOD *DSA_get_default_method(void) 79{ 80 if(!default_DSA_method) default_DSA_method = DSA_OpenSSL(); 81 return default_DSA_method; 82} 83 84DSA *DSA_new(void) 85{ 86 return DSA_new_method(NULL); 87} 88 89DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth) 90{ 91 DSA_METHOD *mtmp; 92 mtmp = dsa->meth; 93 if (mtmp->finish) mtmp->finish(dsa); 94 dsa->meth = meth; 95 if (meth->init) meth->init(dsa); 96 return mtmp; 97} 98 99 100DSA *DSA_new_method(DSA_METHOD *meth) 101 { 102 DSA *ret; 103 104 ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 105 if (ret == NULL) 106 { 107 DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE); 108 return(NULL); 109 } 110 if(meth) ret->meth = meth; 111 else ret->meth = DSA_get_default_method(); 112 ret->pad=0; 113 ret->version=0; 114 ret->write_params=1; 115 ret->p=NULL; 116 ret->q=NULL; 117 ret->g=NULL; 118 119 ret->pub_key=NULL; 120 ret->priv_key=NULL; 121 122 ret->kinv=NULL; 123 ret->r=NULL; 124 ret->method_mont_p=NULL; 125 126 ret->references=1; 127 ret->flags=ret->meth->flags; 128 CRYPTO_new_ex_data(dsa_meth,ret,&ret->ex_data); 129 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 130 { 131 CRYPTO_free_ex_data(dsa_meth,ret,&ret->ex_data); 132 OPENSSL_free(ret); 133 ret=NULL; 134 } 135 136 return(ret); 137 } 138 139void DSA_free(DSA *r) 140 { 141 int i; 142 143 if (r == NULL) return; 144 145 i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 146#ifdef REF_PRINT 147 REF_PRINT("DSA",r); 148#endif 149 if (i > 0) return; 150#ifdef REF_CHECK 151 if (i < 0) 152 { 153 fprintf(stderr,"DSA_free, bad reference count\n"); 154 abort(); 155 } 156#endif 157 158 if(r->meth->finish) r->meth->finish(r); 159 160 CRYPTO_free_ex_data(dsa_meth, r, &r->ex_data); 161 162 if (r->p != NULL) BN_clear_free(r->p); 163 if (r->q != NULL) BN_clear_free(r->q); 164 if (r->g != NULL) BN_clear_free(r->g); 165 if (r->pub_key != NULL) BN_clear_free(r->pub_key); 166 if (r->priv_key != NULL) BN_clear_free(r->priv_key); 167 if (r->kinv != NULL) BN_clear_free(r->kinv); 168 if (r->r != NULL) BN_clear_free(r->r); 169 OPENSSL_free(r); 170 } 171 172int DSA_size(DSA *r) 173 { 174 int ret,i; 175 ASN1_INTEGER bs; 176 unsigned char buf[4]; 177 178 i=BN_num_bits(r->q); 179 bs.length=(i+7)/8; 180 bs.data=buf; 181 bs.type=V_ASN1_INTEGER; 182 /* If the top bit is set the asn1 encoding is 1 larger. */ 183 buf[0]=0xff; 184 185 i=i2d_ASN1_INTEGER(&bs,NULL); 186 i+=i; /* r and s */ 187 ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 188 return(ret); 189 } 190 191int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 192 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 193 { 194 dsa_meth_num++; 195 return(CRYPTO_get_ex_new_index(dsa_meth_num-1, 196 &dsa_meth,argl,argp,new_func,dup_func,free_func)); 197 } 198 199int DSA_set_ex_data(DSA *d, int idx, void *arg) 200 { 201 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 202 } 203 204void *DSA_get_ex_data(DSA *d, int idx) 205 { 206 return(CRYPTO_get_ex_data(&d->ex_data,idx)); 207 } 208 209#ifndef NO_DH 210DH *DSA_dup_DH(DSA *r) 211 { 212 /* DSA has p, q, g, optional pub_key, optional priv_key. 213 * DH has p, optional length, g, optional pub_key, optional priv_key. 214 */ 215 216 DH *ret = NULL; 217 218 if (r == NULL) 219 goto err; 220 ret = DH_new(); 221 if (ret == NULL) 222 goto err; 223 if (r->p != NULL) 224 if ((ret->p = BN_dup(r->p)) == NULL) 225 goto err; 226 if (r->q != NULL) 227 ret->length = BN_num_bits(r->q); 228 if (r->g != NULL) 229 if ((ret->g = BN_dup(r->g)) == NULL) 230 goto err; 231 if (r->pub_key != NULL) 232 if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 233 goto err; 234 if (r->priv_key != NULL) 235 if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 236 goto err; 237 238 return ret; 239 240 err: 241 if (ret != NULL) 242 DH_free(ret); 243 return NULL; 244 } 245#endif 246