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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 <string.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 <openssl/thread.h>
-
- #include "internal.h"
- #include "../internal.h"
-
-
- extern const DSA_METHOD DSA_default_method;
-
- static CRYPTO_EX_DATA_CLASS g_ex_data_class = CRYPTO_EX_DATA_CLASS_INIT;
-
- 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;
-
- CRYPTO_MUTEX_init(&dsa->method_mont_p_lock);
-
- if (!CRYPTO_new_ex_data(&g_ex_data_class, 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(&g_ex_data_class, 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(&g_ex_data_class, 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);
- }
- CRYPTO_MUTEX_cleanup(&dsa->method_mont_p_lock);
- 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) {
- int index;
- if (!CRYPTO_get_ex_new_index(&g_ex_data_class, &index, argl, argp, new_func,
- dup_func, free_func)) {
- return -1;
- }
- return index;
- }
-
- 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;
- }
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