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dsa_key.c

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1/* $OpenBSD: dsa_key.c,v 1.23 2017/01/21 09:38:59 beck Exp $ */-
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)-
3 * All rights reserved.-
4 *-
5 * This package is an SSL implementation written-
6 * by Eric Young (eay@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@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@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@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#include <stdio.h>-
60#include <time.h>-
61-
62#include <openssl/opensslconf.h>-
63-
64#ifndef OPENSSL_NO_SHA-
65-
66#include <openssl/bn.h>-
67#include <openssl/dsa.h>-
68#include "bn_lcl.h"-
69-
70static int dsa_builtin_keygen(DSA *dsa);-
71-
72int-
73DSA_generate_key(DSA *dsa)-
74{-
75 if (dsa->meth->dsa_keygen)
dsa->meth->dsa_keygenDescription
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
76 return dsa->meth->dsa_keygen(dsa);
never executed: return dsa->meth->dsa_keygen(dsa);
0
77 return dsa_builtin_keygen(dsa);
executed 2 times by 2 tests: return dsa_builtin_keygen(dsa);
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
2
78}-
79-
80static int-
81dsa_builtin_keygen(DSA *dsa)-
82{-
83 int ok = 0;-
84 BN_CTX *ctx = NULL;-
85 BIGNUM *pub_key = NULL, *priv_key = NULL;-
86-
87 if ((ctx = BN_CTX_new()) == NULL)
(ctx = BN_CTX_...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
88 goto err;
never executed: goto err;
0
89-
90 if (dsa->priv_key == NULL) {
dsa->priv_key == ((void *)0)Description
TRUEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-2
91 if ((priv_key = BN_new()) == NULL)
(priv_key = BN...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
92 goto err;
never executed: goto err;
0
93 } else
executed 2 times by 2 tests: end of block
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
2
94 priv_key=dsa->priv_key;
never executed: priv_key=dsa->priv_key;
0
95-
96 do {-
97 if (!BN_rand_range(priv_key, dsa->q))
!BN_rand_range...v_key, dsa->q)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
98 goto err;
never executed: goto err;
0
99 } while (BN_is_zero(priv_key));
executed 2 times by 2 tests: end of block
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
((priv_key)->top == 0)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
100-
101 if (dsa->pub_key == NULL) {
dsa->pub_key == ((void *)0)Description
TRUEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
FALSEnever evaluated
0-2
102 if ((pub_key = BN_new()) == NULL)
(pub_key = BN_...== ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
103 goto err;
never executed: goto err;
0
104 } else
executed 2 times by 2 tests: end of block
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
2
105 pub_key=dsa->pub_key;
never executed: pub_key=dsa->pub_key;
0
106 -
107 {-
108 BIGNUM prk;-
109-
110 BN_with_flags(&prk, priv_key, BN_FLG_CONSTTIME);-
111-
112 if (!BN_mod_exp_ct(pub_key, dsa->g, &prk, dsa->p, ctx))
!BN_mod_exp_ct..., dsa->p, ctx)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
113 goto err;
never executed: goto err;
0
114 }-
115-
116 dsa->priv_key = priv_key;-
117 dsa->pub_key = pub_key;-
118 ok = 1;-
119-
120err:
code before this statement executed 2 times by 2 tests: err:
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
2
121 if (pub_key != NULL && dsa->pub_key == NULL)
pub_key != ((void *)0)Description
TRUEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
FALSEnever evaluated
dsa->pub_key == ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
122 BN_free(pub_key);
never executed: BN_free(pub_key);
0
123 if (priv_key != NULL && dsa->priv_key == NULL)
priv_key != ((void *)0)Description
TRUEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
FALSEnever evaluated
dsa->priv_key == ((void *)0)Description
TRUEnever evaluated
FALSEevaluated 2 times by 2 tests
Evaluated by:
  • dsatest
  • libcrypto.so.44.0.1
0-2
124 BN_free(priv_key);
never executed: BN_free(priv_key);
0
125 BN_CTX_free(ctx);-
126 return ok;
executed 2 times by 2 tests: return ok;
Executed by:
  • dsatest
  • libcrypto.so.44.0.1
2
127}-
128#endif-
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