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/* 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.]
*
* The DSS routines are based on patches supplied by
* Steven Schoch <schoch@sheba.arc.nasa.gov>. */
#include <openssl/dsa.h>
#include <openssl/asn1.h>
#include <openssl/dh.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include <openssl/ex_data.h>
#include <openssl/mem.h>
#include "internal.h"
extern const DSA_METHOD DSA_default_method;
DSA *DSA_new(void) { return DSA_new_method(NULL); }
DSA *DSA_new_method(const ENGINE *engine) {
DSA *dsa = (DSA *)OPENSSL_malloc(sizeof(DSA));
if (dsa == NULL) {
OPENSSL_PUT_ERROR(DSA, DSA_new_method, ERR_R_MALLOC_FAILURE);
return NULL;
}
memset(dsa, 0, sizeof(DSA));
if (engine) {
dsa->meth = ENGINE_get_DSA_method(engine);
}
if (dsa->meth == NULL) {
dsa->meth = (DSA_METHOD*) &DSA_default_method;
}
METHOD_ref(dsa->meth);
dsa->write_params = 1;
dsa->references = 1;
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data)) {
METHOD_unref(dsa->meth);
OPENSSL_free(dsa);
return NULL;
}
if (dsa->meth->init && !dsa->meth->init(dsa)) {
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data);
METHOD_unref(dsa->meth);
OPENSSL_free(dsa);
return NULL;
}
return dsa;
}
void DSA_free(DSA *dsa) {
if (dsa == NULL) {
return;
}
if (CRYPTO_add(&dsa->references, -1, CRYPTO_LOCK_DSA) > 0) {
return;
}
if (dsa->meth->finish) {
dsa->meth->finish(dsa);
}
METHOD_unref(dsa->meth);
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data);
if (dsa->p != NULL)
BN_clear_free(dsa->p);
if (dsa->q != NULL)
BN_clear_free(dsa->q);
if (dsa->g != NULL)
BN_clear_free(dsa->g);
if (dsa->pub_key != NULL)
BN_clear_free(dsa->pub_key);
if (dsa->priv_key != NULL)
BN_clear_free(dsa->priv_key);
if (dsa->kinv != NULL)
BN_clear_free(dsa->kinv);
if (dsa->r != NULL)
BN_clear_free(dsa->r);
OPENSSL_free(dsa);
}
int DSA_up_ref(DSA *dsa) {
CRYPTO_add(&dsa->references, 1, CRYPTO_LOCK_DSA);
return 1;
}
int DSA_generate_parameters_ex(DSA *dsa, unsigned bits, const uint8_t *seed_in,
size_t seed_len, int *out_counter,
unsigned long *out_h, BN_GENCB *cb) {
if (dsa->meth->generate_parameters) {
return dsa->meth->generate_parameters(dsa, bits, seed_in, seed_len,
out_counter, out_h, cb);
}
return DSA_default_method.generate_parameters(dsa, bits, seed_in, seed_len,
out_counter, out_h, cb);
}
int DSA_generate_key(DSA *dsa) {
if (dsa->meth->keygen) {
return dsa->meth->keygen(dsa);
}
return DSA_default_method.keygen(dsa);
}
DSA_SIG *DSA_SIG_new(void) {
DSA_SIG *sig;
sig = OPENSSL_malloc(sizeof(DSA_SIG));
if (!sig) {
return NULL;
}
sig->r = NULL;
sig->s = NULL;
return sig;
}
void DSA_SIG_free(DSA_SIG *sig) {
if (!sig) {
return;
}
if (sig->r) {
BN_free(sig->r);
}
if (sig->s) {
BN_free(sig->s);
}
OPENSSL_free(sig);
}
DSA_SIG *DSA_do_sign(const uint8_t *digest, size_t digest_len, DSA *dsa) {
if (dsa->meth->sign) {
return dsa->meth->sign(digest, digest_len, dsa);
}
return DSA_default_method.sign(digest, digest_len, dsa);
}
int DSA_do_verify(const uint8_t *digest, size_t digest_len, DSA_SIG *sig,
const DSA *dsa) {
int valid;
if (!DSA_do_check_signature(&valid, digest, digest_len, sig, dsa)) {
return -1;
}
return valid;
}
int DSA_do_check_signature(int *out_valid, const uint8_t *digest,
size_t digest_len, DSA_SIG *sig, const DSA *dsa) {
if (dsa->meth->verify) {
return dsa->meth->verify(out_valid, digest, digest_len, sig, dsa);
}
return DSA_default_method.verify(out_valid, digest, digest_len, sig, dsa);
}
int DSA_sign(int type, const uint8_t *digest, size_t digest_len,
uint8_t *out_sig, unsigned int *out_siglen, DSA *dsa) {
DSA_SIG *s;
s = DSA_do_sign(digest, digest_len, dsa);
if (s == NULL) {
*out_siglen = 0;
return 0;
}
*out_siglen = i2d_DSA_SIG(s, &out_sig);
DSA_SIG_free(s);
return 1;
}
int DSA_verify(int type, const uint8_t *digest, size_t digest_len,
const uint8_t *sig, size_t sig_len, const DSA *dsa) {
int valid;
if (!DSA_check_signature(&valid, digest, digest_len, sig, sig_len, dsa)) {
return -1;
}
return valid;
}
int DSA_check_signature(int *out_valid, const uint8_t *digest,
size_t digest_len, const uint8_t *sig, size_t sig_len,
const DSA *dsa) {
DSA_SIG *s = NULL;
int ret = 0;
uint8_t *der = NULL;
s = DSA_SIG_new();
if (s == NULL) {
goto err;
}
const uint8_t *sigp = sig;
if (d2i_DSA_SIG(&s, &sigp, sig_len) == NULL || sigp != sig + sig_len) {
goto err;
}
/* Ensure that the signature uses DER and doesn't have trailing garbage. */
int der_len = i2d_DSA_SIG(s, &der);
if (der_len < 0 || (size_t)der_len != sig_len || memcmp(sig, der, sig_len)) {
goto err;
}
ret = DSA_do_check_signature(out_valid, digest, digest_len, s, dsa);
err:
if (der != NULL) {
OPENSSL_free(der);
}
if (s) {
DSA_SIG_free(s);
}
return ret;
}
int DSA_size(const DSA *dsa) {
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(dsa->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_sign_setup(const DSA *dsa, BN_CTX *ctx, BIGNUM **out_kinv,
BIGNUM **out_r) {
if (dsa->meth->sign_setup) {
return dsa->meth->sign_setup(dsa, ctx, out_kinv, out_r, NULL, 0);
}
return DSA_default_method.sign_setup(dsa, ctx, out_kinv, out_r, NULL, 0);
}
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(const DSA *d, int idx) {
return CRYPTO_get_ex_data(&d->ex_data, idx);
}
DH *DSA_dup_DH(const DSA *r) {
DH *ret = NULL;
if (r == NULL) {
goto err;
}
ret = DH_new();
if (ret == NULL) {
goto err;
}
if (r->q != NULL) {
ret->priv_length = BN_num_bits(r->q);
if ((ret->q = BN_dup(r->q)) == NULL) {
goto err;
}
}
if ((r->p != NULL && (ret->p = BN_dup(r->p)) == NULL) ||
(r->g != NULL && (ret->g = BN_dup(r->g)) == NULL) ||
(r->pub_key != NULL && (ret->pub_key = BN_dup(r->pub_key)) == NULL) ||
(r->priv_key != NULL && (ret->priv_key = BN_dup(r->priv_key)) == NULL)) {
goto err;
}
return ret;
err:
if (ret != NULL) {
DH_free(ret);
}
return NULL;
}