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1 /* crypto/dsa/dsa_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
59 /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
63 #include <openssl/bn.h>
64 #include <openssl/dsa.h>
65 #include <openssl/asn1.h>
66 #include <openssl/engine.h>
68 const char *DSA_version
="DSA" OPENSSL_VERSION_PTEXT
;
70 static const DSA_METHOD
*default_DSA_method
;
71 static int dsa_meth_num
= 0;
72 static STACK_OF(CRYPTO_EX_DATA_FUNCS
) *dsa_meth
= NULL
;
74 void DSA_set_default_openssl_method(const DSA_METHOD
*meth
)
77 /* We'll need to notify the "openssl" ENGINE of this
78 * change too. We won't bother locking things down at
79 * our end as there was never any locking in these
81 if(default_DSA_method
!= meth
)
83 default_DSA_method
= meth
;
84 e
= ENGINE_by_id("openssl");
87 ENGINE_set_DSA(e
, meth
);
93 const DSA_METHOD
*DSA_get_default_openssl_method(void)
95 if(!default_DSA_method
) default_DSA_method
= DSA_OpenSSL();
96 return default_DSA_method
;
101 return DSA_new_method(NULL
);
105 DSA_METHOD
*DSA_set_method(DSA
*dsa
, DSA_METHOD
*meth
)
109 if (mtmp
->finish
) mtmp
->finish(dsa
);
111 if (meth
->init
) meth
->init(dsa
);
115 int DSA_set_method(DSA
*dsa
, ENGINE
*engine
)
118 const DSA_METHOD
*meth
;
120 meth
= ENGINE_get_DSA(mtmp
);
121 if (!ENGINE_init(engine
))
123 if (meth
->finish
) meth
->finish(dsa
);
124 dsa
->engine
= engine
;
125 meth
= ENGINE_get_DSA(engine
);
126 if (meth
->init
) meth
->init(dsa
);
127 /* SHOULD ERROR CHECK THIS!!! */
135 DSA
*DSA_new_method(DSA_METHOD
*meth
)
137 DSA
*DSA_new_method(ENGINE
*engine
)
140 const DSA_METHOD
*meth
;
143 ret
=(DSA
*)OPENSSL_malloc(sizeof(DSA
));
146 DSAerr(DSA_F_DSA_NEW
,ERR_R_MALLOC_FAILURE
);
152 if(ENGINE_init(engine
))
153 ret
->engine
= engine
;
158 ret
->engine
=ENGINE_get_default_DSA();
160 if(ret
->engine
== NULL
)
162 DSAerr(DSA_F_DSA_NEW
,ERR_LIB_ENGINE
);
167 meth
= ENGINE_get_DSA(ret
->engine
);
180 ret
->method_mont_p
=NULL
;
183 ret
->flags
=meth
->flags
;
184 CRYPTO_new_ex_data(dsa_meth
,ret
,&ret
->ex_data
);
185 if ((meth
->init
!= NULL
) && !meth
->init(ret
))
187 CRYPTO_free_ex_data(dsa_meth
,ret
,&ret
->ex_data
);
195 void DSA_free(DSA
*r
)
197 const DSA_METHOD
*meth
;
200 if (r
== NULL
) return;
202 i
=CRYPTO_add(&r
->references
,-1,CRYPTO_LOCK_DSA
);
210 fprintf(stderr
,"DSA_free, bad reference count\n");
215 meth
= ENGINE_get_DSA(r
->engine
);
216 if(meth
->finish
) meth
->finish(r
);
217 ENGINE_finish(r
->engine
);
219 CRYPTO_free_ex_data(dsa_meth
, r
, &r
->ex_data
);
221 if (r
->p
!= NULL
) BN_clear_free(r
->p
);
222 if (r
->q
!= NULL
) BN_clear_free(r
->q
);
223 if (r
->g
!= NULL
) BN_clear_free(r
->g
);
224 if (r
->pub_key
!= NULL
) BN_clear_free(r
->pub_key
);
225 if (r
->priv_key
!= NULL
) BN_clear_free(r
->priv_key
);
226 if (r
->kinv
!= NULL
) BN_clear_free(r
->kinv
);
227 if (r
->r
!= NULL
) BN_clear_free(r
->r
);
231 int DSA_size(const DSA
*r
)
235 unsigned char buf
[4];
240 bs
.type
=V_ASN1_INTEGER
;
241 /* If the top bit is set the asn1 encoding is 1 larger. */
244 i
=i2d_ASN1_INTEGER(&bs
,NULL
);
246 ret
=ASN1_object_size(1,i
,V_ASN1_SEQUENCE
);
250 int DSA_get_ex_new_index(long argl
, void *argp
, CRYPTO_EX_new
*new_func
,
251 CRYPTO_EX_dup
*dup_func
, CRYPTO_EX_free
*free_func
)
254 return(CRYPTO_get_ex_new_index(dsa_meth_num
-1,
255 &dsa_meth
,argl
,argp
,new_func
,dup_func
,free_func
));
258 int DSA_set_ex_data(DSA
*d
, int idx
, void *arg
)
260 return(CRYPTO_set_ex_data(&d
->ex_data
,idx
,arg
));
263 void *DSA_get_ex_data(DSA
*d
, int idx
)
265 return(CRYPTO_get_ex_data(&d
->ex_data
,idx
));
268 #ifndef OPENSSL_NO_DH
269 DH
*DSA_dup_DH(const DSA
*r
)
271 /* DSA has p, q, g, optional pub_key, optional priv_key.
272 * DH has p, optional length, g, optional pub_key, optional priv_key.
283 if ((ret
->p
= BN_dup(r
->p
)) == NULL
)
286 ret
->length
= BN_num_bits(r
->q
);
288 if ((ret
->g
= BN_dup(r
->g
)) == NULL
)
290 if (r
->pub_key
!= NULL
)
291 if ((ret
->pub_key
= BN_dup(r
->pub_key
)) == NULL
)
293 if (r
->priv_key
!= NULL
)
294 if ((ret
->priv_key
= BN_dup(r
->priv_key
)) == NULL
)