1*0Sstevel@tonic-gate /* crypto/dsa/dsa_lib.c */ 2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * This package is an SSL implementation written 6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com). 7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as 10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions 11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA, 12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms 14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15*0Sstevel@tonic-gate * 16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in 17*0Sstevel@tonic-gate * the code are not to be removed. 18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution 19*0Sstevel@tonic-gate * as the author of the parts of the library used. 20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or 21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package. 22*0Sstevel@tonic-gate * 23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 25*0Sstevel@tonic-gate * are met: 26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright 27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 32*0Sstevel@tonic-gate * must display the following acknowledgement: 33*0Sstevel@tonic-gate * "This product includes cryptographic software written by 34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)" 35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library 36*0Sstevel@tonic-gate * being used are not cryptographic related :-). 37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from 38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement: 39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40*0Sstevel@tonic-gate * 41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51*0Sstevel@tonic-gate * SUCH DAMAGE. 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or 54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be 55*0Sstevel@tonic-gate * copied and put under another distribution licence 56*0Sstevel@tonic-gate * [including the GNU Public Licence.] 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 60*0Sstevel@tonic-gate 61*0Sstevel@tonic-gate #include <stdio.h> 62*0Sstevel@tonic-gate #include "cryptlib.h" 63*0Sstevel@tonic-gate #include <openssl/bn.h> 64*0Sstevel@tonic-gate #include <openssl/dsa.h> 65*0Sstevel@tonic-gate #include <openssl/asn1.h> 66*0Sstevel@tonic-gate #ifndef OPENSSL_NO_ENGINE 67*0Sstevel@tonic-gate #include <openssl/engine.h> 68*0Sstevel@tonic-gate #endif 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 71*0Sstevel@tonic-gate 72*0Sstevel@tonic-gate static const DSA_METHOD *default_DSA_method = NULL; 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate void DSA_set_default_method(const DSA_METHOD *meth) 75*0Sstevel@tonic-gate { 76*0Sstevel@tonic-gate default_DSA_method = meth; 77*0Sstevel@tonic-gate } 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate const DSA_METHOD *DSA_get_default_method(void) 80*0Sstevel@tonic-gate { 81*0Sstevel@tonic-gate if(!default_DSA_method) 82*0Sstevel@tonic-gate default_DSA_method = DSA_OpenSSL(); 83*0Sstevel@tonic-gate return default_DSA_method; 84*0Sstevel@tonic-gate } 85*0Sstevel@tonic-gate 86*0Sstevel@tonic-gate DSA *DSA_new(void) 87*0Sstevel@tonic-gate { 88*0Sstevel@tonic-gate return DSA_new_method(NULL); 89*0Sstevel@tonic-gate } 90*0Sstevel@tonic-gate 91*0Sstevel@tonic-gate int DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 92*0Sstevel@tonic-gate { 93*0Sstevel@tonic-gate /* NB: The caller is specifically setting a method, so it's not up to us 94*0Sstevel@tonic-gate * to deal with which ENGINE it comes from. */ 95*0Sstevel@tonic-gate const DSA_METHOD *mtmp; 96*0Sstevel@tonic-gate mtmp = dsa->meth; 97*0Sstevel@tonic-gate if (mtmp->finish) mtmp->finish(dsa); 98*0Sstevel@tonic-gate #ifndef OPENSSL_NO_ENGINE 99*0Sstevel@tonic-gate if (dsa->engine) 100*0Sstevel@tonic-gate { 101*0Sstevel@tonic-gate ENGINE_finish(dsa->engine); 102*0Sstevel@tonic-gate dsa->engine = NULL; 103*0Sstevel@tonic-gate } 104*0Sstevel@tonic-gate #endif 105*0Sstevel@tonic-gate dsa->meth = meth; 106*0Sstevel@tonic-gate if (meth->init) meth->init(dsa); 107*0Sstevel@tonic-gate return 1; 108*0Sstevel@tonic-gate } 109*0Sstevel@tonic-gate 110*0Sstevel@tonic-gate DSA *DSA_new_method(ENGINE *engine) 111*0Sstevel@tonic-gate { 112*0Sstevel@tonic-gate DSA *ret; 113*0Sstevel@tonic-gate 114*0Sstevel@tonic-gate ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 115*0Sstevel@tonic-gate if (ret == NULL) 116*0Sstevel@tonic-gate { 117*0Sstevel@tonic-gate DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 118*0Sstevel@tonic-gate return(NULL); 119*0Sstevel@tonic-gate } 120*0Sstevel@tonic-gate ret->meth = DSA_get_default_method(); 121*0Sstevel@tonic-gate #ifndef OPENSSL_NO_ENGINE 122*0Sstevel@tonic-gate if (engine) 123*0Sstevel@tonic-gate { 124*0Sstevel@tonic-gate if (!ENGINE_init(engine)) 125*0Sstevel@tonic-gate { 126*0Sstevel@tonic-gate DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 127*0Sstevel@tonic-gate OPENSSL_free(ret); 128*0Sstevel@tonic-gate return NULL; 129*0Sstevel@tonic-gate } 130*0Sstevel@tonic-gate ret->engine = engine; 131*0Sstevel@tonic-gate } 132*0Sstevel@tonic-gate else 133*0Sstevel@tonic-gate ret->engine = ENGINE_get_default_DSA(); 134*0Sstevel@tonic-gate if(ret->engine) 135*0Sstevel@tonic-gate { 136*0Sstevel@tonic-gate ret->meth = ENGINE_get_DSA(ret->engine); 137*0Sstevel@tonic-gate if(!ret->meth) 138*0Sstevel@tonic-gate { 139*0Sstevel@tonic-gate DSAerr(DSA_F_DSA_NEW_METHOD, 140*0Sstevel@tonic-gate ERR_R_ENGINE_LIB); 141*0Sstevel@tonic-gate ENGINE_finish(ret->engine); 142*0Sstevel@tonic-gate OPENSSL_free(ret); 143*0Sstevel@tonic-gate return NULL; 144*0Sstevel@tonic-gate } 145*0Sstevel@tonic-gate } 146*0Sstevel@tonic-gate #endif 147*0Sstevel@tonic-gate 148*0Sstevel@tonic-gate ret->pad=0; 149*0Sstevel@tonic-gate ret->version=0; 150*0Sstevel@tonic-gate ret->write_params=1; 151*0Sstevel@tonic-gate ret->p=NULL; 152*0Sstevel@tonic-gate ret->q=NULL; 153*0Sstevel@tonic-gate ret->g=NULL; 154*0Sstevel@tonic-gate 155*0Sstevel@tonic-gate ret->pub_key=NULL; 156*0Sstevel@tonic-gate ret->priv_key=NULL; 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate ret->kinv=NULL; 159*0Sstevel@tonic-gate ret->r=NULL; 160*0Sstevel@tonic-gate ret->method_mont_p=NULL; 161*0Sstevel@tonic-gate 162*0Sstevel@tonic-gate ret->references=1; 163*0Sstevel@tonic-gate ret->flags=ret->meth->flags; 164*0Sstevel@tonic-gate CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 165*0Sstevel@tonic-gate if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 166*0Sstevel@tonic-gate { 167*0Sstevel@tonic-gate #ifndef OPENSSL_NO_ENGINE 168*0Sstevel@tonic-gate if (ret->engine) 169*0Sstevel@tonic-gate ENGINE_finish(ret->engine); 170*0Sstevel@tonic-gate #endif 171*0Sstevel@tonic-gate CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 172*0Sstevel@tonic-gate OPENSSL_free(ret); 173*0Sstevel@tonic-gate ret=NULL; 174*0Sstevel@tonic-gate } 175*0Sstevel@tonic-gate 176*0Sstevel@tonic-gate return(ret); 177*0Sstevel@tonic-gate } 178*0Sstevel@tonic-gate 179*0Sstevel@tonic-gate void DSA_free(DSA *r) 180*0Sstevel@tonic-gate { 181*0Sstevel@tonic-gate int i; 182*0Sstevel@tonic-gate 183*0Sstevel@tonic-gate if (r == NULL) return; 184*0Sstevel@tonic-gate 185*0Sstevel@tonic-gate i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 186*0Sstevel@tonic-gate #ifdef REF_PRINT 187*0Sstevel@tonic-gate REF_PRINT("DSA",r); 188*0Sstevel@tonic-gate #endif 189*0Sstevel@tonic-gate if (i > 0) return; 190*0Sstevel@tonic-gate #ifdef REF_CHECK 191*0Sstevel@tonic-gate if (i < 0) 192*0Sstevel@tonic-gate { 193*0Sstevel@tonic-gate fprintf(stderr,"DSA_free, bad reference count\n"); 194*0Sstevel@tonic-gate abort(); 195*0Sstevel@tonic-gate } 196*0Sstevel@tonic-gate #endif 197*0Sstevel@tonic-gate 198*0Sstevel@tonic-gate if(r->meth->finish) 199*0Sstevel@tonic-gate r->meth->finish(r); 200*0Sstevel@tonic-gate #ifndef OPENSSL_NO_ENGINE 201*0Sstevel@tonic-gate if(r->engine) 202*0Sstevel@tonic-gate ENGINE_finish(r->engine); 203*0Sstevel@tonic-gate #endif 204*0Sstevel@tonic-gate 205*0Sstevel@tonic-gate CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 206*0Sstevel@tonic-gate 207*0Sstevel@tonic-gate if (r->p != NULL) BN_clear_free(r->p); 208*0Sstevel@tonic-gate if (r->q != NULL) BN_clear_free(r->q); 209*0Sstevel@tonic-gate if (r->g != NULL) BN_clear_free(r->g); 210*0Sstevel@tonic-gate if (r->pub_key != NULL) BN_clear_free(r->pub_key); 211*0Sstevel@tonic-gate if (r->priv_key != NULL) BN_clear_free(r->priv_key); 212*0Sstevel@tonic-gate if (r->kinv != NULL) BN_clear_free(r->kinv); 213*0Sstevel@tonic-gate if (r->r != NULL) BN_clear_free(r->r); 214*0Sstevel@tonic-gate OPENSSL_free(r); 215*0Sstevel@tonic-gate } 216*0Sstevel@tonic-gate 217*0Sstevel@tonic-gate int DSA_up_ref(DSA *r) 218*0Sstevel@tonic-gate { 219*0Sstevel@tonic-gate int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 220*0Sstevel@tonic-gate #ifdef REF_PRINT 221*0Sstevel@tonic-gate REF_PRINT("DSA",r); 222*0Sstevel@tonic-gate #endif 223*0Sstevel@tonic-gate #ifdef REF_CHECK 224*0Sstevel@tonic-gate if (i < 2) 225*0Sstevel@tonic-gate { 226*0Sstevel@tonic-gate fprintf(stderr, "DSA_up_ref, bad reference count\n"); 227*0Sstevel@tonic-gate abort(); 228*0Sstevel@tonic-gate } 229*0Sstevel@tonic-gate #endif 230*0Sstevel@tonic-gate return ((i > 1) ? 1 : 0); 231*0Sstevel@tonic-gate } 232*0Sstevel@tonic-gate 233*0Sstevel@tonic-gate int DSA_size(const DSA *r) 234*0Sstevel@tonic-gate { 235*0Sstevel@tonic-gate int ret,i; 236*0Sstevel@tonic-gate ASN1_INTEGER bs; 237*0Sstevel@tonic-gate unsigned char buf[4]; /* 4 bytes looks really small. 238*0Sstevel@tonic-gate However, i2d_ASN1_INTEGER() will not look 239*0Sstevel@tonic-gate beyond the first byte, as long as the second 240*0Sstevel@tonic-gate parameter is NULL. */ 241*0Sstevel@tonic-gate 242*0Sstevel@tonic-gate i=BN_num_bits(r->q); 243*0Sstevel@tonic-gate bs.length=(i+7)/8; 244*0Sstevel@tonic-gate bs.data=buf; 245*0Sstevel@tonic-gate bs.type=V_ASN1_INTEGER; 246*0Sstevel@tonic-gate /* If the top bit is set the asn1 encoding is 1 larger. */ 247*0Sstevel@tonic-gate buf[0]=0xff; 248*0Sstevel@tonic-gate 249*0Sstevel@tonic-gate i=i2d_ASN1_INTEGER(&bs,NULL); 250*0Sstevel@tonic-gate i+=i; /* r and s */ 251*0Sstevel@tonic-gate ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 252*0Sstevel@tonic-gate return(ret); 253*0Sstevel@tonic-gate } 254*0Sstevel@tonic-gate 255*0Sstevel@tonic-gate int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 256*0Sstevel@tonic-gate CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 257*0Sstevel@tonic-gate { 258*0Sstevel@tonic-gate return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 259*0Sstevel@tonic-gate new_func, dup_func, free_func); 260*0Sstevel@tonic-gate } 261*0Sstevel@tonic-gate 262*0Sstevel@tonic-gate int DSA_set_ex_data(DSA *d, int idx, void *arg) 263*0Sstevel@tonic-gate { 264*0Sstevel@tonic-gate return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 265*0Sstevel@tonic-gate } 266*0Sstevel@tonic-gate 267*0Sstevel@tonic-gate void *DSA_get_ex_data(DSA *d, int idx) 268*0Sstevel@tonic-gate { 269*0Sstevel@tonic-gate return(CRYPTO_get_ex_data(&d->ex_data,idx)); 270*0Sstevel@tonic-gate } 271*0Sstevel@tonic-gate 272*0Sstevel@tonic-gate #ifndef OPENSSL_NO_DH 273*0Sstevel@tonic-gate DH *DSA_dup_DH(const DSA *r) 274*0Sstevel@tonic-gate { 275*0Sstevel@tonic-gate /* DSA has p, q, g, optional pub_key, optional priv_key. 276*0Sstevel@tonic-gate * DH has p, optional length, g, optional pub_key, optional priv_key. 277*0Sstevel@tonic-gate */ 278*0Sstevel@tonic-gate 279*0Sstevel@tonic-gate DH *ret = NULL; 280*0Sstevel@tonic-gate 281*0Sstevel@tonic-gate if (r == NULL) 282*0Sstevel@tonic-gate goto err; 283*0Sstevel@tonic-gate ret = DH_new(); 284*0Sstevel@tonic-gate if (ret == NULL) 285*0Sstevel@tonic-gate goto err; 286*0Sstevel@tonic-gate if (r->p != NULL) 287*0Sstevel@tonic-gate if ((ret->p = BN_dup(r->p)) == NULL) 288*0Sstevel@tonic-gate goto err; 289*0Sstevel@tonic-gate if (r->q != NULL) 290*0Sstevel@tonic-gate ret->length = BN_num_bits(r->q); 291*0Sstevel@tonic-gate if (r->g != NULL) 292*0Sstevel@tonic-gate if ((ret->g = BN_dup(r->g)) == NULL) 293*0Sstevel@tonic-gate goto err; 294*0Sstevel@tonic-gate if (r->pub_key != NULL) 295*0Sstevel@tonic-gate if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 296*0Sstevel@tonic-gate goto err; 297*0Sstevel@tonic-gate if (r->priv_key != NULL) 298*0Sstevel@tonic-gate if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 299*0Sstevel@tonic-gate goto err; 300*0Sstevel@tonic-gate 301*0Sstevel@tonic-gate return ret; 302*0Sstevel@tonic-gate 303*0Sstevel@tonic-gate err: 304*0Sstevel@tonic-gate if (ret != NULL) 305*0Sstevel@tonic-gate DH_free(ret); 306*0Sstevel@tonic-gate return NULL; 307*0Sstevel@tonic-gate } 308*0Sstevel@tonic-gate #endif 309