/* $OpenBSD: dsa_lib.c,v 1.23 2017/01/29 17:49:22 beck Exp $ */ /* 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 */ #include #include #include #include #include #include #ifndef OPENSSL_NO_DH #include #endif #ifndef OPENSSL_NO_ENGINE #include #endif 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) default_DSA_method = DSA_OpenSSL(); 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 = malloc(sizeof(DSA)); if (ret == NULL) { DSAerror(ERR_R_MALLOC_FAILURE); return NULL; } ret->meth = DSA_get_default_method(); #ifndef OPENSSL_NO_ENGINE if (engine) { if (!ENGINE_init(engine)) { DSAerror(ERR_R_ENGINE_LIB); 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) { DSAerror(ERR_R_ENGINE_LIB); ENGINE_finish(ret->engine); 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); 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); if (i > 0) return; 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); 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); BN_clear_free(r->kinv); BN_clear_free(r->r); free(r); } int DSA_up_ref(DSA *r) { int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA); 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: DH_free(ret); return NULL; } #endif