Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/dsa/dsa_key.c

-/* crypto/dsa/dsa_key.c */
-/* 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.]
- */
-
-#include <stdio.h>
-#include <time.h>
-#include "cryptlib.h"
-#ifndef OPENSSL_NO_SHA
-#include <openssl/bn.h>
-#include <openssl/dsa.h>
-#include <openssl/rand.h>
-
-#ifdef OPENSSL_FIPS
-#include <openssl/fips.h>
-#endif
-
-static int dsa_builtin_keygen(DSA *dsa);
-
-int DSA_generate_key(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_GENERATE_KEY, DSA_R_NON_FIPS_DSA_METHOD);
-                return 0;
-                }
-#endif
-        if(dsa->meth->dsa_keygen)
-                return dsa->meth->dsa_keygen(dsa);
-#ifdef OPENSSL_FIPS
-        if (FIPS_mode())
-                return FIPS_dsa_generate_key(dsa);
-#endif
-        return dsa_builtin_keygen(dsa);
-        }
-
-static int dsa_builtin_keygen(DSA *dsa)
-        {
-        int ok=0;
-        BN_CTX *ctx=NULL;
-        BIGNUM *pub_key=NULL,*priv_key=NULL;
-
-        if ((ctx=BN_CTX_new()) == NULL) goto err;
-
-        if (dsa->priv_key == NULL)
-                {
-                if ((priv_key=BN_new()) == NULL) goto err;
-                }
-        else
-                priv_key=dsa->priv_key;
-
-        do
-                if (!BN_rand_range(priv_key,dsa->q)) goto err;
-        while (BN_is_zero(priv_key));
-
-        if (dsa->pub_key == NULL)
-                {
-                if ((pub_key=BN_new()) == NULL) goto err;
-                }
-        else
-                pub_key=dsa->pub_key;
-        
-        {
-                BIGNUM local_prk;
-                BIGNUM *prk;
-
-                if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
-                        {
-                        BN_init(&local_prk);
-                        prk = &local_prk;
-                        BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
-                        }
-                else
-                        prk = priv_key;
-
-                if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err;
-        }
-
-        dsa->priv_key=priv_key;
-        dsa->pub_key=pub_key;
-        ok=1;
-
-err:
-        if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
-        if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
-        if (ctx != NULL) BN_CTX_free(ctx);
-        return(ok);
-        }
-#endif