X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fdsa%2Fdsa_lib.c;h=9c001d7b1bf78972ae38919e4016c46336267f21;hp=ce8e204f7e6fcb402c9377cd9a43f6a65479ed9d;hb=8cc44d970ced1004db0727d7a7b3e2709c442e55;hpb=a12258fcd2feaaec9820a68d0b65a11c491ccf04 diff --git a/crypto/dsa/dsa_lib.c b/crypto/dsa/dsa_lib.c index ce8e204f7e..9c001d7b1b 100644 --- a/crypto/dsa/dsa_lib.c +++ b/crypto/dsa/dsa_lib.c @@ -1,184 +1,341 @@ -/* crypto/dsa/dsa_lib.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2016 The OpenSSL Project Authors. 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.] + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ /* Original version from Steven Schoch */ #include -#include "cryptlib.h" +#include "internal/cryptlib.h" #include -#include +#include "dsa_locl.h" #include +#include +#include -const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT; +static const DSA_METHOD *default_DSA_method = NULL; + +void DSA_set_default_method(const DSA_METHOD *meth) +{ + default_DSA_method = meth; +} + +const DSA_METHOD *DSA_get_default_method(void) +{ + if (!default_DSA_method) + default_DSA_method = DSA_OpenSSL(); + return default_DSA_method; +} DSA *DSA_new(void) - { - DSA *ret; - - ret=(DSA *)Malloc(sizeof(DSA)); - if (ret == NULL) - { - DSAerr(DSA_F_DSA_NEW,ERR_R_MALLOC_FAILURE); - return(NULL); - } - ret->pad=0; - ret->version=0; - ret->write_params=1; - ret->p=NULL; - ret->q=NULL; - ret->g=NULL; - ret->flags=DSA_FLAG_CACHE_MONT_P; - - ret->pub_key=NULL; - ret->priv_key=NULL; - - ret->kinv=NULL; - ret->r=NULL; - ret->method_mont_p=NULL; - - ret->references=1; - return(ret); - } +{ + return DSA_new_method(NULL); +} -void DSA_free(DSA *r) - { - int i; +int DSA_set_method(DSA *dsa, const DSA_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 DSA_METHOD *mtmp; + mtmp = dsa->meth; + if (mtmp->finish) + mtmp->finish(dsa); +#ifndef OPENSSL_NO_ENGINE + ENGINE_finish(dsa->engine); + dsa->engine = NULL; +#endif + dsa->meth = meth; + if (meth->init) + meth->init(dsa); + return 1; +} + +const DSA_METHOD *DSA_get_method(DSA *d) +{ + return d->meth; +} + +DSA *DSA_new_method(ENGINE *engine) +{ + DSA *ret = OPENSSL_zalloc(sizeof(*ret)); - if (r == NULL) return; + if (ret == NULL) { + DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); + return NULL; + } - i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA); -#ifdef REF_PRINT - REF_PRINT("DSA",r); + ret->references = 1; + ret->lock = CRYPTO_THREAD_lock_new(); + if (ret->lock == NULL) { + DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); + OPENSSL_free(ret); + return NULL; + } + + ret->meth = DSA_get_default_method(); +#ifndef OPENSSL_NO_ENGINE + ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */ + if (engine) { + if (!ENGINE_init(engine)) { + DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); + goto err; + } + ret->engine = engine; + } else + ret->engine = ENGINE_get_default_DSA(); + if (ret->engine) { + ret->meth = ENGINE_get_DSA(ret->engine); + if (ret->meth == NULL) { + DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); + goto err; + } + } #endif - if (i > 0) return; -#ifdef REF_CHECK - if (i < 0) - { - fprintf(stderr,"DSA_free, bad reference count\n"); - abort(); - } + + ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; + + if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data)) + goto err; + + if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { + DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_INIT_FAIL); +err: + DSA_free(ret); + ret = NULL; + } + + return ret; +} + +void DSA_free(DSA *r) +{ + int i; + + if (r == NULL) + return; + + CRYPTO_atomic_add(&r->references, -1, &i, r->lock); + REF_PRINT_COUNT("DSA", 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 - if (r->p != NULL) BN_clear_free(r->p); - if (r->q != NULL) BN_clear_free(r->q); - if (r->g != NULL) BN_clear_free(r->g); - if (r->pub_key != NULL) BN_clear_free(r->pub_key); - if (r->priv_key != NULL) BN_clear_free(r->priv_key); - if (r->kinv != NULL) BN_clear_free(r->kinv); - if (r->r != NULL) BN_clear_free(r->r); - if (r->method_mont_p != NULL) - BN_MONT_CTX_free((BN_MONT_CTX *)r->method_mont_p); - Free(r); - } - -int DSA_size(DSA *r) - { - int ret,i; - ASN1_INTEGER bs; - unsigned char buf[4]; - - i=BN_num_bits(r->q); - bs.length=(i+7)/8; - bs.data=buf; - bs.type=V_ASN1_INTEGER; - /* If the top bit is set the asn1 encoding is 1 larger. */ - buf[0]=0xff; - - i=i2d_ASN1_INTEGER(&bs,NULL); - i+=i; /* r and s */ - ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE); - return(ret); - } - -#ifndef NO_DH -DH *DSA_dup_DH(DSA *r) - { - /* DSA has p, q, g, optional pub_key, optional priv_key. - * DH has p, optional length, g, optional pub_key, optional priv_key. - */ - - DH *ret = NULL; - - if (r == NULL) - goto err; - ret = DH_new(); - if (ret == NULL) - goto err; - if (r->p != NULL) - if ((ret->p = BN_dup(r->p)) == NULL) - goto err; - if (r->q != NULL) - ret->length = BN_num_bits(r->q); - if (r->g != NULL) - if ((ret->g = BN_dup(r->g)) == NULL) - goto err; - if (r->pub_key != NULL) - if ((ret->pub_key = BN_dup(r->pub_key)) == NULL) - goto err; - if (r->priv_key != NULL) - if ((ret->priv_key = BN_dup(r->priv_key)) == NULL) - goto err; - - return ret; + CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); + + CRYPTO_THREAD_lock_free(r->lock); + + BN_clear_free(r->p); + BN_clear_free(r->q); + BN_clear_free(r->g); + BN_clear_free(r->pub_key); + BN_clear_free(r->priv_key); + OPENSSL_free(r); +} + +int DSA_up_ref(DSA *r) +{ + int i; + + if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0) + return 0; + + REF_PRINT_COUNT("DSA", r); + REF_ASSERT_ISNT(i < 2); + return ((i > 1) ? 1 : 0); +} + +int DSA_size(const DSA *r) +{ + int ret, i; + ASN1_INTEGER bs; + unsigned char buf[4]; /* 4 bytes looks really small. However, + * i2d_ASN1_INTEGER() will not look beyond + * the first byte, as long as the second + * parameter is NULL. */ + + i = BN_num_bits(r->q); + bs.length = (i + 7) / 8; + bs.data = buf; + bs.type = V_ASN1_INTEGER; + /* If the top bit is set the asn1 encoding is 1 larger. */ + buf[0] = 0xff; + + i = i2d_ASN1_INTEGER(&bs, NULL); + i += i; /* r and s */ + ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); + return (ret); +} + +int DSA_set_ex_data(DSA *d, int idx, void *arg) +{ + return (CRYPTO_set_ex_data(&d->ex_data, idx, arg)); +} + +void *DSA_get_ex_data(DSA *d, int idx) +{ + return (CRYPTO_get_ex_data(&d->ex_data, idx)); +} + +int DSA_security_bits(const DSA *d) +{ + if (d->p && d->q) + return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q)); + return -1; +} + +#ifndef OPENSSL_NO_DH +DH *DSA_dup_DH(const DSA *r) +{ + /* + * DSA has p, q, g, optional pub_key, optional priv_key. DH has p, + * optional length, g, optional pub_key, optional priv_key, optional q. + */ + + DH *ret = NULL; + BIGNUM *p = NULL, *q = NULL, *g = NULL, *pub_key = NULL, *priv_key = NULL; + + if (r == NULL) + goto err; + ret = DH_new(); + if (ret == NULL) + goto err; + if (r->p != NULL || r->g != NULL || r->q != NULL) { + if (r->p == NULL || r->g == NULL || r->q == NULL) { + /* Shouldn't happen */ + goto err; + } + p = BN_dup(r->p); + g = BN_dup(r->g); + q = BN_dup(r->q); + if (p == NULL || g == NULL || q == NULL || !DH_set0_pqg(ret, p, q, g)) + goto err; + p = g = q = NULL; + } + + if (r->pub_key != NULL) { + pub_key = BN_dup(r->pub_key); + if (pub_key == NULL) + goto err; + if (r->priv_key != NULL) { + priv_key = BN_dup(r->priv_key); + if (priv_key == NULL) + goto err; + } + if (!DH_set0_key(ret, pub_key, priv_key)) + goto err; + } else if (r->priv_key != NULL) { + /* Shouldn't happen */ + goto err; + } + + return ret; err: - if (ret != NULL) - DH_free(ret); - return NULL; - } + BN_free(p); + BN_free(g); + BN_free(q); + BN_free(pub_key); + BN_free(priv_key); + DH_free(ret); + return NULL; +} #endif + +void DSA_get0_pqg(const DSA *d, + const BIGNUM **p, const BIGNUM **q, const BIGNUM **g) +{ + if (p != NULL) + *p = d->p; + if (q != NULL) + *q = d->q; + if (g != NULL) + *g = d->g; +} + +int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g) +{ + /* If the fields p, q and g in d are NULL, the corresponding input + * parameters MUST be non-NULL. + */ + if ((d->p == NULL && p == NULL) + || (d->q == NULL && q == NULL) + || (d->g == NULL && g == NULL)) + return 0; + + if (p != NULL) { + BN_free(d->p); + d->p = p; + } + if (q != NULL) { + BN_free(d->q); + d->q = q; + } + if (g != NULL) { + BN_free(d->g); + d->g = g; + } + + return 1; +} + +void DSA_get0_key(const DSA *d, + const BIGNUM **pub_key, const BIGNUM **priv_key) +{ + if (pub_key != NULL) + *pub_key = d->pub_key; + if (priv_key != NULL) + *priv_key = d->priv_key; +} + +int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key) +{ + /* If the field pub_key in d is NULL, the corresponding input + * parameters MUST be non-NULL. The priv_key field may + * be left NULL. + */ + if (d->pub_key == NULL && pub_key == NULL) + return 0; + + if (pub_key != NULL) { + BN_free(d->pub_key); + d->pub_key = pub_key; + } + if (priv_key != NULL) { + BN_free(d->priv_key); + d->priv_key = priv_key; + } + + return 1; +} + +void DSA_clear_flags(DSA *d, int flags) +{ + d->flags &= ~flags; +} + +int DSA_test_flags(const DSA *d, int flags) +{ + return d->flags & flags; +} + +void DSA_set_flags(DSA *d, int flags) +{ + d->flags |= flags; +} + +ENGINE *DSA_get0_engine(DSA *d) +{ + return d->engine; +}