| /* 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; |
| } |