/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include "internal/cryptlib.h" #include #include #ifndef OPENSSL_NO_ENGINE # include #endif static const DH_METHOD *default_DH_method = NULL; void DH_set_default_method(const DH_METHOD *meth) { default_DH_method = meth; } const DH_METHOD *DH_get_default_method(void) { if (!default_DH_method) default_DH_method = DH_OpenSSL(); return default_DH_method; } int DH_set_method(DH *dh, const DH_METHOD *meth) { /* * NB: The caller is specifically setting a method, so it's not up to us * to deal with which ENGINE it comes from. */ const DH_METHOD *mtmp; mtmp = dh->meth; if (mtmp->finish) mtmp->finish(dh); #ifndef OPENSSL_NO_ENGINE ENGINE_finish(dh->engine); dh->engine = NULL; #endif dh->meth = meth; if (meth->init) meth->init(dh); return 1; } DH *DH_new(void) { return DH_new_method(NULL); } DH *DH_new_method(ENGINE *engine) { DH *ret = OPENSSL_zalloc(sizeof(*ret)); if (ret == NULL) { DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE); return (NULL); } ret->meth = DH_get_default_method(); #ifndef OPENSSL_NO_ENGINE if (engine) { if (!ENGINE_init(engine)) { DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); OPENSSL_free(ret); return NULL; } ret->engine = engine; } else ret->engine = ENGINE_get_default_DH(); if (ret->engine) { ret->meth = ENGINE_get_DH(ret->engine); if (ret->meth == NULL) { DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB); ENGINE_finish(ret->engine); OPENSSL_free(ret); return NULL; } } #endif ret->references = 1; ret->flags = ret->meth->flags; CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { #ifndef OPENSSL_NO_ENGINE ENGINE_finish(ret->engine); #endif CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data); OPENSSL_free(ret); ret = NULL; } return (ret); } void DH_free(DH *r) { int i; if (r == NULL) return; i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH); REF_PRINT_COUNT("DH", r); if (i > 0) return; REF_ASSERT_ISNT(i < 0); if (r->meth->finish) r->meth->finish(r); #ifndef OPENSSL_NO_ENGINE ENGINE_finish(r->engine); #endif CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data); BN_clear_free(r->p); BN_clear_free(r->g); BN_clear_free(r->q); BN_clear_free(r->j); OPENSSL_free(r->seed); BN_clear_free(r->counter); BN_clear_free(r->pub_key); BN_clear_free(r->priv_key); OPENSSL_free(r); } int DH_up_ref(DH *r) { int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH); REF_PRINT_COUNT("DH", r); REF_ASSERT_ISNT(i < 2); return ((i > 1) ? 1 : 0); } int DH_set_ex_data(DH *d, int idx, void *arg) { return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); } void *DH_get_ex_data(DH *d, int idx) { return (CRYPTO_get_ex_data(&d->ex_data, idx)); } int DH_bits(const DH *dh) { return BN_num_bits(dh->p); } int DH_size(const DH *dh) { return (BN_num_bytes(dh->p)); } int DH_security_bits(const DH *dh) { int N; if (dh->q) N = BN_num_bits(dh->q); else if (dh->length) N = dh->length; else N = -1; return BN_security_bits(BN_num_bits(dh->p), N); }