You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
329 lines
9.3 KiB
329 lines
9.3 KiB
/* crypto/dsa/dsa_lib.c */ |
|
/* 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.] |
|
*/ |
|
|
|
/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */ |
|
|
|
#include <stdio.h> |
|
#include "cryptlib.h" |
|
#include <openssl/bn.h> |
|
#include <openssl/dsa.h> |
|
#include <openssl/asn1.h> |
|
#ifndef OPENSSL_NO_ENGINE |
|
# include <openssl/engine.h> |
|
#endif |
|
#ifndef OPENSSL_NO_DH |
|
# include <openssl/dh.h> |
|
#endif |
|
|
|
#ifdef OPENSSL_FIPS |
|
# include <openssl/fips.h> |
|
#endif |
|
|
|
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) { |
|
#ifdef OPENSSL_FIPS |
|
if (FIPS_mode()) |
|
return FIPS_dsa_openssl(); |
|
else |
|
return DSA_OpenSSL(); |
|
#else |
|
default_DSA_method = DSA_OpenSSL(); |
|
#endif |
|
} |
|
return default_DSA_method; |
|
} |
|
|
|
DSA *DSA_new(void) |
|
{ |
|
return DSA_new_method(NULL); |
|
} |
|
|
|
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 |
|
if (dsa->engine) { |
|
ENGINE_finish(dsa->engine); |
|
dsa->engine = NULL; |
|
} |
|
#endif |
|
dsa->meth = meth; |
|
if (meth->init) |
|
meth->init(dsa); |
|
return 1; |
|
} |
|
|
|
DSA *DSA_new_method(ENGINE *engine) |
|
{ |
|
DSA *ret; |
|
|
|
ret = (DSA *)OPENSSL_malloc(sizeof(DSA)); |
|
if (ret == NULL) { |
|
DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE); |
|
return (NULL); |
|
} |
|
ret->meth = DSA_get_default_method(); |
|
#ifndef OPENSSL_NO_ENGINE |
|
if (engine) { |
|
if (!ENGINE_init(engine)) { |
|
DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); |
|
OPENSSL_free(ret); |
|
return NULL; |
|
} |
|
ret->engine = engine; |
|
} else |
|
ret->engine = ENGINE_get_default_DSA(); |
|
if (ret->engine) { |
|
ret->meth = ENGINE_get_DSA(ret->engine); |
|
if (!ret->meth) { |
|
DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB); |
|
ENGINE_finish(ret->engine); |
|
OPENSSL_free(ret); |
|
return NULL; |
|
} |
|
} |
|
#endif |
|
|
|
ret->pad = 0; |
|
ret->version = 0; |
|
ret->write_params = 1; |
|
ret->p = NULL; |
|
ret->q = NULL; |
|
ret->g = NULL; |
|
|
|
ret->pub_key = NULL; |
|
ret->priv_key = NULL; |
|
|
|
ret->kinv = NULL; |
|
ret->r = NULL; |
|
ret->method_mont_p = NULL; |
|
|
|
ret->references = 1; |
|
ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; |
|
CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); |
|
if ((ret->meth->init != NULL) && !ret->meth->init(ret)) { |
|
#ifndef OPENSSL_NO_ENGINE |
|
if (ret->engine) |
|
ENGINE_finish(ret->engine); |
|
#endif |
|
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data); |
|
OPENSSL_free(ret); |
|
ret = NULL; |
|
} |
|
|
|
return (ret); |
|
} |
|
|
|
void DSA_free(DSA *r) |
|
{ |
|
int i; |
|
|
|
if (r == NULL) |
|
return; |
|
|
|
i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DSA); |
|
#ifdef REF_PRINT |
|
REF_PRINT("DSA", r); |
|
#endif |
|
if (i > 0) |
|
return; |
|
#ifdef REF_CHECK |
|
if (i < 0) { |
|
fprintf(stderr, "DSA_free, bad reference count\n"); |
|
abort(); |
|
} |
|
#endif |
|
|
|
if (r->meth->finish) |
|
r->meth->finish(r); |
|
#ifndef OPENSSL_NO_ENGINE |
|
if (r->engine) |
|
ENGINE_finish(r->engine); |
|
#endif |
|
|
|
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data); |
|
|
|
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); |
|
OPENSSL_free(r); |
|
} |
|
|
|
int DSA_up_ref(DSA *r) |
|
{ |
|
int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); |
|
#ifdef REF_PRINT |
|
REF_PRINT("DSA", r); |
|
#endif |
|
#ifdef REF_CHECK |
|
if (i < 2) { |
|
fprintf(stderr, "DSA_up_ref, bad reference count\n"); |
|
abort(); |
|
} |
|
#endif |
|
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_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
|
CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func) |
|
{ |
|
return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, |
|
new_func, dup_func, free_func); |
|
} |
|
|
|
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)); |
|
} |
|
|
|
#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; |
|
|
|
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 ((ret->q = BN_dup(r->q)) == NULL) |
|
goto err; |
|
} |
|
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; |
|
|
|
err: |
|
if (ret != NULL) |
|
DH_free(ret); |
|
return NULL; |
|
} |
|
#endif
|
|
|