dsa_sign.c

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/* crypto/dsa/dsa_sign.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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 <[email protected]> */

#include "cryptlib.h"
#include <openssl/dsa.h>
#include <openssl/rand.h>
#include <openssl/bn.h>

DSA_SIG * DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
    {
#ifdef OPENSSL_FIPS
    if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
            && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
        {
        DSAerr(DSA_F_DSA_DO_SIGN, DSA_R_NON_FIPS_DSA_METHOD);
        return NULL;
        }
#endif
    return dsa->meth->dsa_do_sign(dgst, dlen, dsa);
    }

int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
    {
#ifdef OPENSSL_FIPS
    if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
            && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
        {
        DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_NON_FIPS_DSA_METHOD);
        return 0;
        }
#endif
    return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp);
    }

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)
        {
        if (sig->r)
            BN_free(sig->r);
        if (sig->s)
            BN_free(sig->s);
        OPENSSL_free(sig);
        }
    }