155714Skris/* crypto/dh/dh_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. 8280304Sjkim * 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). 15280304Sjkim * 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. 22280304Sjkim * 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 :-). 37280304Sjkim * 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)" 40280304Sjkim * 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. 52280304Sjkim * 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#include <stdio.h> 6055714Skris#include "cryptlib.h" 6155714Skris#include <openssl/bn.h> 6255714Skris#include <openssl/dh.h> 63111147Snectar#ifndef OPENSSL_NO_ENGINE 64280304Sjkim# include <openssl/engine.h> 65111147Snectar#endif 6655714Skris 67238405Sjkim#ifdef OPENSSL_FIPS 68280304Sjkim# include <openssl/fips.h> 69238405Sjkim#endif 70238405Sjkim 71280304Sjkimconst char DH_version[] = "Diffie-Hellman" OPENSSL_VERSION_PTEXT; 7255714Skris 73109998Smarkmstatic const DH_METHOD *default_DH_method = NULL; 7459191Skris 75109998Smarkmvoid DH_set_default_method(const DH_METHOD *meth) 76280304Sjkim{ 77280304Sjkim default_DH_method = meth; 78280304Sjkim} 7959191Skris 80109998Smarkmconst DH_METHOD *DH_get_default_method(void) 81280304Sjkim{ 82280304Sjkim if (!default_DH_method) { 83238405Sjkim#ifdef OPENSSL_FIPS 84280304Sjkim if (FIPS_mode()) 85280304Sjkim return FIPS_dh_openssl(); 86280304Sjkim else 87280304Sjkim return DH_OpenSSL(); 88238405Sjkim#else 89280304Sjkim default_DH_method = DH_OpenSSL(); 90238405Sjkim#endif 91280304Sjkim } 92280304Sjkim return default_DH_method; 93280304Sjkim} 9459191Skris 95109998Smarkmint DH_set_method(DH *dh, const DH_METHOD *meth) 96280304Sjkim{ 97280304Sjkim /* 98280304Sjkim * NB: The caller is specifically setting a method, so it's not up to us 99280304Sjkim * to deal with which ENGINE it comes from. 100280304Sjkim */ 101280304Sjkim const DH_METHOD *mtmp; 102280304Sjkim mtmp = dh->meth; 103280304Sjkim if (mtmp->finish) 104280304Sjkim mtmp->finish(dh); 105111147Snectar#ifndef OPENSSL_NO_ENGINE 106280304Sjkim if (dh->engine) { 107280304Sjkim ENGINE_finish(dh->engine); 108280304Sjkim dh->engine = NULL; 109280304Sjkim } 110111147Snectar#endif 111280304Sjkim dh->meth = meth; 112280304Sjkim if (meth->init) 113280304Sjkim meth->init(dh); 114280304Sjkim return 1; 115280304Sjkim} 11659191Skris 11755714SkrisDH *DH_new(void) 118280304Sjkim{ 119280304Sjkim return DH_new_method(NULL); 120280304Sjkim} 12159191Skris 122109998SmarkmDH *DH_new_method(ENGINE *engine) 123280304Sjkim{ 124280304Sjkim DH *ret; 125109998Smarkm 126280304Sjkim ret = (DH *)OPENSSL_malloc(sizeof(DH)); 127280304Sjkim if (ret == NULL) { 128280304Sjkim DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE); 129280304Sjkim return (NULL); 130280304Sjkim } 131109998Smarkm 132280304Sjkim ret->meth = DH_get_default_method(); 133111147Snectar#ifndef OPENSSL_NO_ENGINE 134280304Sjkim if (engine) { 135280304Sjkim if (!ENGINE_init(engine)) { 136280304Sjkim DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 137280304Sjkim OPENSSL_free(ret); 138280304Sjkim return NULL; 139280304Sjkim } 140280304Sjkim ret->engine = engine; 141280304Sjkim } else 142280304Sjkim ret->engine = ENGINE_get_default_DH(); 143280304Sjkim if (ret->engine) { 144280304Sjkim ret->meth = ENGINE_get_DH(ret->engine); 145280304Sjkim if (!ret->meth) { 146280304Sjkim DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); 147280304Sjkim ENGINE_finish(ret->engine); 148280304Sjkim OPENSSL_free(ret); 149280304Sjkim return NULL; 150280304Sjkim } 151280304Sjkim } 152111147Snectar#endif 153109998Smarkm 154280304Sjkim ret->pad = 0; 155280304Sjkim ret->version = 0; 156280304Sjkim ret->p = NULL; 157280304Sjkim ret->g = NULL; 158280304Sjkim ret->length = 0; 159280304Sjkim ret->pub_key = NULL; 160280304Sjkim ret->priv_key = NULL; 161280304Sjkim ret->q = NULL; 162280304Sjkim ret->j = NULL; 163280304Sjkim ret->seed = NULL; 164280304Sjkim ret->seedlen = 0; 165280304Sjkim ret->counter = NULL; 166280304Sjkim ret->method_mont_p = NULL; 167280304Sjkim ret->references = 1; 168280304Sjkim ret->flags = ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW; 169280304Sjkim CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 170280304Sjkim if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { 171111147Snectar#ifndef OPENSSL_NO_ENGINE 172280304Sjkim if (ret->engine) 173280304Sjkim ENGINE_finish(ret->engine); 174111147Snectar#endif 175280304Sjkim CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); 176280304Sjkim OPENSSL_free(ret); 177280304Sjkim ret = NULL; 178280304Sjkim } 179280304Sjkim return (ret); 180280304Sjkim} 18155714Skris 18255714Skrisvoid DH_free(DH *r) 183280304Sjkim{ 184280304Sjkim int i; 185280304Sjkim if (r == NULL) 186280304Sjkim return; 187280304Sjkim i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); 18859191Skris#ifdef REF_PRINT 189280304Sjkim REF_PRINT("DH", r); 19059191Skris#endif 191280304Sjkim if (i > 0) 192280304Sjkim return; 19359191Skris#ifdef REF_CHECK 194280304Sjkim if (i < 0) { 195280304Sjkim fprintf(stderr, "DH_free, bad reference count\n"); 196280304Sjkim abort(); 197280304Sjkim } 19859191Skris#endif 19959191Skris 200280304Sjkim if (r->meth->finish) 201280304Sjkim r->meth->finish(r); 202111147Snectar#ifndef OPENSSL_NO_ENGINE 203280304Sjkim if (r->engine) 204280304Sjkim ENGINE_finish(r->engine); 205111147Snectar#endif 20676866Skris 207280304Sjkim CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); 20859191Skris 209280304Sjkim if (r->p != NULL) 210280304Sjkim BN_clear_free(r->p); 211280304Sjkim if (r->g != NULL) 212280304Sjkim BN_clear_free(r->g); 213280304Sjkim if (r->q != NULL) 214280304Sjkim BN_clear_free(r->q); 215280304Sjkim if (r->j != NULL) 216280304Sjkim BN_clear_free(r->j); 217280304Sjkim if (r->seed) 218280304Sjkim OPENSSL_free(r->seed); 219280304Sjkim if (r->counter != NULL) 220280304Sjkim BN_clear_free(r->counter); 221280304Sjkim if (r->pub_key != NULL) 222280304Sjkim BN_clear_free(r->pub_key); 223280304Sjkim if (r->priv_key != NULL) 224280304Sjkim BN_clear_free(r->priv_key); 225280304Sjkim OPENSSL_free(r); 226280304Sjkim} 22755714Skris 228109998Smarkmint DH_up_ref(DH *r) 229280304Sjkim{ 230280304Sjkim int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); 231109998Smarkm#ifdef REF_PRINT 232280304Sjkim REF_PRINT("DH", r); 233109998Smarkm#endif 234109998Smarkm#ifdef REF_CHECK 235280304Sjkim if (i < 2) { 236280304Sjkim fprintf(stderr, "DH_up, bad reference count\n"); 237280304Sjkim abort(); 238280304Sjkim } 239109998Smarkm#endif 240280304Sjkim return ((i > 1) ? 1 : 0); 241280304Sjkim} 242109998Smarkm 24359191Skrisint DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 244280304Sjkim CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) 245280304Sjkim{ 246280304Sjkim return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp, 247280304Sjkim new_func, dup_func, free_func); 248280304Sjkim} 24959191Skris 25059191Skrisint DH_set_ex_data(DH *d, int idx, void *arg) 251280304Sjkim{ 252280304Sjkim return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); 253280304Sjkim} 25459191Skris 25559191Skrisvoid *DH_get_ex_data(DH *d, int idx) 256280304Sjkim{ 257280304Sjkim return (CRYPTO_get_ex_data(&d->ex_data, idx)); 258280304Sjkim} 25959191Skris 260109998Smarkmint DH_size(const DH *dh) 261280304Sjkim{ 262280304Sjkim return (BN_num_bytes(dh->p)); 263280304Sjkim} 264