openssl/crypto/dsa/dsa_lib.c

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/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include "internal/refcount.h"
#include <openssl/bn.h>
#include "dsa_local.h"
#include <openssl/asn1.h>
#include <openssl/engine.h>
#include <openssl/dh.h>
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DSA *DSA_new(void)
{
return DSA_new_method(NULL);
}
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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;
}
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const DSA_METHOD *DSA_get_method(DSA *d)
{
return d->meth;
}
DSA *DSA_new_method(ENGINE *engine)
{
DSA *ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
return NULL;
}
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
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);
goto err;
}
return ret;
err:
DSA_free(ret);
return NULL;
}
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void DSA_free(DSA *r)
{
int i;
if (r == NULL)
return;
CRYPTO_DOWN_REF(&r->references, &i, r->lock);
REF_PRINT_COUNT("DSA", r);
if (i > 0)
return;
REF_ASSERT_ISNT(i < 0);
if (r->meth != NULL && r->meth->finish != NULL)
r->meth->finish(r);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(r->engine);
#endif
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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_UP_REF(&r->references, &i, r->lock) <= 0)
return 0;
REF_PRINT_COUNT("DSA", r);
REF_ASSERT_ISNT(i < 2);
return ((i > 1) ? 1 : 0);
}
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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;
}
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int DSA_set_ex_data(DSA *d, int idx, void *arg)
{
return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
}
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void *DSA_get_ex_data(DSA *d, int idx)
{
return CRYPTO_get_ex_data(&d->ex_data, idx);
}
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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
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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:
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;
}
d->dirty_cnt++;
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;
}
d->dirty_cnt++;
return 1;
}
const BIGNUM *DSA_get0_p(const DSA *d)
{
return d->p;
}
const BIGNUM *DSA_get0_q(const DSA *d)
{
return d->q;
}
const BIGNUM *DSA_get0_g(const DSA *d)
{
return d->g;
}
const BIGNUM *DSA_get0_pub_key(const DSA *d)
{
return d->pub_key;
}
const BIGNUM *DSA_get0_priv_key(const DSA *d)
{
return d->priv_key;
}
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;
}
int DSA_bits(const DSA *dsa)
{
return BN_num_bits(dsa->p);
}