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      1 /* crypto/dsa/dsa_sign.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.]
     57  */
     58 
     59 /* Original version from Steven Schoch <schoch (at) sheba.arc.nasa.gov> */
     60 
     61 #include "cryptlib.h"
     62 #include <openssl/dsa.h>
     63 #include <openssl/rand.h>
     64 #include <openssl/bn.h>
     65 
     66 DSA_SIG * DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
     67 	{
     68 #ifdef OPENSSL_FIPS
     69 	if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
     70 			&& !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
     71 		{
     72 		DSAerr(DSA_F_DSA_DO_SIGN, DSA_R_NON_FIPS_DSA_METHOD);
     73 		return NULL;
     74 		}
     75 #endif
     76 	return dsa->meth->dsa_do_sign(dgst, dlen, dsa);
     77 	}
     78 
     79 int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
     80 	{
     81 #ifdef OPENSSL_FIPS
     82 	if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
     83 			&& !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
     84 		{
     85 		DSAerr(DSA_F_DSA_SIGN_SETUP, DSA_R_NON_FIPS_DSA_METHOD);
     86 		return 0;
     87 		}
     88 #endif
     89 	return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp);
     90 	}
     91 
     92 DSA_SIG *DSA_SIG_new(void)
     93 	{
     94 	DSA_SIG *sig;
     95 	sig = OPENSSL_malloc(sizeof(DSA_SIG));
     96 	if (!sig)
     97 		return NULL;
     98 	sig->r = NULL;
     99 	sig->s = NULL;
    100 	return sig;
    101 	}
    102 
    103 void DSA_SIG_free(DSA_SIG *sig)
    104 	{
    105 	if (sig)
    106 		{
    107 		if (sig->r)
    108 			BN_free(sig->r);
    109 		if (sig->s)
    110 			BN_free(sig->s);
    111 		OPENSSL_free(sig);
    112 		}
    113 	}
    114 
    115