dsa_lib.c revision 109998
155714Skris/* crypto/dsa/dsa_lib.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ 6055714Skris 6155714Skris#include <stdio.h> 6255714Skris#include "cryptlib.h" 6355714Skris#include <openssl/bn.h> 6455714Skris#include <openssl/dsa.h> 6555714Skris#include <openssl/asn1.h> 66109998Smarkm#include <openssl/engine.h> 6755714Skris 6855714Skrisconst char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; 6955714Skris 70109998Smarkmstatic const DSA_METHOD *default_DSA_method = NULL; 7159191Skris 72109998Smarkmvoid DSA_set_default_method(const DSA_METHOD *meth) 73109998Smarkm { 7459191Skris default_DSA_method = meth; 75109998Smarkm } 7659191Skris 77109998Smarkmconst DSA_METHOD *DSA_get_default_method(void) 78109998Smarkm { 79109998Smarkm if(!default_DSA_method) 80109998Smarkm default_DSA_method = DSA_OpenSSL(); 8159191Skris return default_DSA_method; 82109998Smarkm } 8359191Skris 8455714SkrisDSA *DSA_new(void) 85109998Smarkm { 8659191Skris return DSA_new_method(NULL); 87109998Smarkm } 8859191Skris 89109998Smarkmint DSA_set_method(DSA *dsa, const DSA_METHOD *meth) 90109998Smarkm { 91109998Smarkm /* NB: The caller is specifically setting a method, so it's not up to us 92109998Smarkm * to deal with which ENGINE it comes from. */ 93109998Smarkm const DSA_METHOD *mtmp; 9459191Skris mtmp = dsa->meth; 9559191Skris if (mtmp->finish) mtmp->finish(dsa); 96109998Smarkm if (dsa->engine) 97109998Smarkm { 98109998Smarkm ENGINE_finish(dsa->engine); 99109998Smarkm dsa->engine = NULL; 100109998Smarkm } 10159191Skris dsa->meth = meth; 10259191Skris if (meth->init) meth->init(dsa); 103109998Smarkm return 1; 104109998Smarkm } 10559191Skris 106109998SmarkmDSA *DSA_new_method(ENGINE *engine) 10755714Skris { 10855714Skris DSA *ret; 10955714Skris 11068651Skris ret=(DSA *)OPENSSL_malloc(sizeof(DSA)); 11155714Skris if (ret == NULL) 11255714Skris { 113109998Smarkm DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE); 11455714Skris return(NULL); 11555714Skris } 116109998Smarkm ret->meth = DSA_get_default_method(); 117109998Smarkm if (engine) 118109998Smarkm { 119109998Smarkm if (!ENGINE_init(engine)) 120109998Smarkm { 121109998Smarkm DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); 122109998Smarkm OPENSSL_free(ret); 123109998Smarkm return NULL; 124109998Smarkm } 125109998Smarkm ret->engine = engine; 126109998Smarkm } 127109998Smarkm else 128109998Smarkm ret->engine = ENGINE_get_default_DSA(); 129109998Smarkm if(ret->engine) 130109998Smarkm { 131109998Smarkm ret->meth = ENGINE_get_DSA(ret->engine); 132109998Smarkm if(!ret->meth) 133109998Smarkm { 134109998Smarkm DSAerr(DSA_F_DSA_NEW_METHOD, 135109998Smarkm ERR_R_ENGINE_LIB); 136109998Smarkm ENGINE_finish(ret->engine); 137109998Smarkm OPENSSL_free(ret); 138109998Smarkm return NULL; 139109998Smarkm } 140109998Smarkm } 141109998Smarkm 14255714Skris ret->pad=0; 14355714Skris ret->version=0; 14455714Skris ret->write_params=1; 14555714Skris ret->p=NULL; 14655714Skris ret->q=NULL; 14755714Skris ret->g=NULL; 14855714Skris 14955714Skris ret->pub_key=NULL; 15055714Skris ret->priv_key=NULL; 15155714Skris 15255714Skris ret->kinv=NULL; 15355714Skris ret->r=NULL; 15455714Skris ret->method_mont_p=NULL; 15555714Skris 15655714Skris ret->references=1; 15759191Skris ret->flags=ret->meth->flags; 158109998Smarkm CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 15959191Skris if ((ret->meth->init != NULL) && !ret->meth->init(ret)) 16059191Skris { 161109998Smarkm if (ret->engine) 162109998Smarkm ENGINE_finish(ret->engine); 163109998Smarkm CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); 16468651Skris OPENSSL_free(ret); 16559191Skris ret=NULL; 16659191Skris } 16759191Skris 16855714Skris return(ret); 16955714Skris } 17055714Skris 17155714Skrisvoid DSA_free(DSA *r) 17255714Skris { 17355714Skris int i; 17455714Skris 17555714Skris if (r == NULL) return; 17655714Skris 17755714Skris i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); 17855714Skris#ifdef REF_PRINT 17955714Skris REF_PRINT("DSA",r); 18055714Skris#endif 18155714Skris if (i > 0) return; 18255714Skris#ifdef REF_CHECK 18355714Skris if (i < 0) 18455714Skris { 18555714Skris fprintf(stderr,"DSA_free, bad reference count\n"); 18655714Skris abort(); 18755714Skris } 18855714Skris#endif 18955714Skris 190109998Smarkm if(r->meth->finish) 191109998Smarkm r->meth->finish(r); 192109998Smarkm if(r->engine) 193109998Smarkm ENGINE_finish(r->engine); 19476866Skris 195109998Smarkm CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); 19659191Skris 19755714Skris if (r->p != NULL) BN_clear_free(r->p); 19855714Skris if (r->q != NULL) BN_clear_free(r->q); 19955714Skris if (r->g != NULL) BN_clear_free(r->g); 20055714Skris if (r->pub_key != NULL) BN_clear_free(r->pub_key); 20155714Skris if (r->priv_key != NULL) BN_clear_free(r->priv_key); 20255714Skris if (r->kinv != NULL) BN_clear_free(r->kinv); 20355714Skris if (r->r != NULL) BN_clear_free(r->r); 20468651Skris OPENSSL_free(r); 20555714Skris } 20655714Skris 207109998Smarkmint DSA_up_ref(DSA *r) 20855714Skris { 209109998Smarkm int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 210109998Smarkm#ifdef REF_PRINT 211109998Smarkm REF_PRINT("DSA",r); 212109998Smarkm#endif 213109998Smarkm#ifdef REF_CHECK 214109998Smarkm if (i < 2) 215109998Smarkm { 216109998Smarkm fprintf(stderr, "DSA_up_ref, bad reference count\n"); 217109998Smarkm abort(); 218109998Smarkm } 219109998Smarkm#endif 220109998Smarkm return ((i > 1) ? 1 : 0); 221109998Smarkm } 222109998Smarkm 223109998Smarkmint DSA_size(const DSA *r) 224109998Smarkm { 22555714Skris int ret,i; 22655714Skris ASN1_INTEGER bs; 227109998Smarkm unsigned char buf[4]; /* 4 bytes looks really small. 228109998Smarkm However, i2d_ASN1_INTEGER() will not look 229109998Smarkm beyond the first byte, as long as the second 230109998Smarkm parameter is NULL. */ 23155714Skris 23255714Skris i=BN_num_bits(r->q); 23355714Skris bs.length=(i+7)/8; 23455714Skris bs.data=buf; 23555714Skris bs.type=V_ASN1_INTEGER; 23655714Skris /* If the top bit is set the asn1 encoding is 1 larger. */ 23755714Skris buf[0]=0xff; 23855714Skris 23955714Skris i=i2d_ASN1_INTEGER(&bs,NULL); 24055714Skris i+=i; /* r and s */ 24155714Skris ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); 24255714Skris return(ret); 24355714Skris } 24455714Skris 24559191Skrisint DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 24659191Skris CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 24759191Skris { 248109998Smarkm return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, 249109998Smarkm new_func, dup_func, free_func); 25059191Skris } 25159191Skris 25259191Skrisint DSA_set_ex_data(DSA *d, int idx, void *arg) 25359191Skris { 25459191Skris return(CRYPTO_set_ex_data(&d->ex_data,idx,arg)); 25559191Skris } 25659191Skris 25759191Skrisvoid *DSA_get_ex_data(DSA *d, int idx) 25859191Skris { 25959191Skris return(CRYPTO_get_ex_data(&d->ex_data,idx)); 26059191Skris } 26159191Skris 262109998Smarkm#ifndef OPENSSL_NO_DH 263109998SmarkmDH *DSA_dup_DH(const DSA *r) 26455714Skris { 26555714Skris /* DSA has p, q, g, optional pub_key, optional priv_key. 26655714Skris * DH has p, optional length, g, optional pub_key, optional priv_key. 26755714Skris */ 26855714Skris 26955714Skris DH *ret = NULL; 27055714Skris 27155714Skris if (r == NULL) 27255714Skris goto err; 27355714Skris ret = DH_new(); 27455714Skris if (ret == NULL) 27555714Skris goto err; 27655714Skris if (r->p != NULL) 27755714Skris if ((ret->p = BN_dup(r->p)) == NULL) 27855714Skris goto err; 27955714Skris if (r->q != NULL) 28055714Skris ret->length = BN_num_bits(r->q); 28155714Skris if (r->g != NULL) 28255714Skris if ((ret->g = BN_dup(r->g)) == NULL) 28355714Skris goto err; 28455714Skris if (r->pub_key != NULL) 28555714Skris if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) 28655714Skris goto err; 28755714Skris if (r->priv_key != NULL) 28855714Skris if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) 28955714Skris goto err; 29055714Skris 29155714Skris return ret; 29255714Skris 29355714Skris err: 29455714Skris if (ret != NULL) 29555714Skris DH_free(ret); 29655714Skris return NULL; 29755714Skris } 29855714Skris#endif 299