1 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
60 #include <openssl/x509.h>
61 #include <openssl/asn1.h>
62 #include <openssl/dsa.h>
64 static int dsa_pub_decode(EVP_PKEY
*pkey
, X509_PUBKEY
*pubkey
)
66 const unsigned char *p
, *pm
;
72 ASN1_INTEGER
*public_key
= NULL
;
76 if (!X509_PUBKEY_get0_param(NULL
, &p
, &pklen
, &palg
, pubkey
))
78 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
80 if (ptype
!= V_ASN1_SEQUENCE
)
82 DSAerr(DSA_F_DSA_PUB_DECODE
, DSA_R_PARAMETER_ENCODING_ERROR
);
90 if (!(dsa
= d2i_DSAparams(NULL
, &pm
, pmlen
)))
92 DSAerr(DSA_F_DSA_PUB_DECODE
, DSA_R_DECODE_ERROR
);
96 if (!(public_key
=d2i_ASN1_INTEGER(NULL
, &p
, pklen
)))
98 DSAerr(DSA_F_DSA_PUB_DECODE
, DSA_R_DECODE_ERROR
);
102 /* We have parameters now set public key */
103 if (!(dsa
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
)))
105 DSAerr(DSA_F_DSA_PUB_DECODE
, DSA_R_BN_DECODE_ERROR
);
109 ASN1_INTEGER_free(public_key
);
115 ASN1_INTEGER_free(public_key
);
122 static int dsa_pub_encode(X509_PUBKEY
*pk
, EVP_PKEY
*pkey
)
127 unsigned char *penc
= NULL
;
131 if (pkey
->save_parameters
)
134 str
= ASN1_STRING_new();
135 str
->length
= i2d_DSAparams(dsa
, &str
->data
);
136 if (str
->length
<= 0)
138 DSAerr(DSA_F_DSA_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
141 ptype
= V_ASN1_SEQUENCE
;
145 ptype
= V_ASN1_UNDEF
;
150 penclen
= i2d_DSAPublicKey(dsa
, &penc
);
154 DSAerr(DSA_F_DSA_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
158 if (X509_PUBKEY_set0_param(pk
, OBJ_nid2obj(EVP_PKEY_DSA
),
159 ptype
, pval
, penc
, penclen
))
166 ASN1_STRING_free(pval
);
171 /* In PKCS#8 DSA: you just get a private key integer and parameters in the
172 * AlgorithmIdentifier the pubkey must be recalculated.
175 static int dsa_priv_decode(EVP_PKEY
*pkey
, PKCS8_PRIV_KEY_INFO
*p8
)
177 const unsigned char *p
, *pm
;
183 ASN1_INTEGER
*privkey
= NULL
;
186 STACK_OF(ASN1_TYPE
) *ndsa
= NULL
;
189 if (!PKCS8_pkey_get0(NULL
, &p
, &pklen
, &palg
, p8
))
191 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
193 /* Check for broken DSA PKCS#8, UGH! */
194 if (*p
== (V_ASN1_SEQUENCE
|V_ASN1_CONSTRUCTED
))
197 if(!(ndsa
= ASN1_seq_unpack_ASN1_TYPE(p
, pklen
,
201 if (sk_ASN1_TYPE_num(ndsa
) != 2)
203 /* Handle Two broken types:
204 * SEQUENCE {parameters, priv_key}
205 * SEQUENCE {pub_key, priv_key}
208 t1
= sk_ASN1_TYPE_value(ndsa
, 0);
209 t2
= sk_ASN1_TYPE_value(ndsa
, 1);
210 if (t1
->type
== V_ASN1_SEQUENCE
)
212 p8
->broken
= PKCS8_EMBEDDED_PARAM
;
213 pval
= t1
->value
.ptr
;
215 else if (ptype
== V_ASN1_SEQUENCE
)
216 p8
->broken
= PKCS8_NS_DB
;
220 if (t2
->type
!= V_ASN1_INTEGER
)
223 privkey
= t2
->value
.integer
;
227 if (!(privkey
=d2i_ASN1_INTEGER(NULL
, &p
, pklen
)))
229 if (ptype
!= V_ASN1_SEQUENCE
)
235 pmlen
= pstr
->length
;
236 if (!(dsa
= d2i_DSAparams(NULL
, &pm
, pmlen
)))
238 /* We have parameters now set private key */
239 if (!(dsa
->priv_key
= ASN1_INTEGER_to_BN(privkey
, NULL
)))
241 DSAerr(DSA_F_DSA_PRIV_DECODE
,DSA_R_BN_ERROR
);
244 /* Calculate public key */
245 if (!(dsa
->pub_key
= BN_new()))
247 DSAerr(DSA_F_DSA_PRIV_DECODE
, ERR_R_MALLOC_FAILURE
);
250 if (!(ctx
= BN_CTX_new()))
252 DSAerr(DSA_F_DSA_PRIV_DECODE
, ERR_R_MALLOC_FAILURE
);
256 if (!BN_mod_exp(dsa
->pub_key
, dsa
->g
, dsa
->priv_key
, dsa
->p
, ctx
))
258 DSAerr(DSA_F_DSA_PRIV_DECODE
,DSA_R_BN_ERROR
);
262 EVP_PKEY_assign_DSA(pkey
, dsa
);
265 sk_ASN1_TYPE_pop_free(ndsa
, ASN1_TYPE_free
);
267 ASN1_INTEGER_free(privkey
);
272 DSAerr(DSA_F_DSA_PRIV_DECODE
, EVP_R_DECODE_ERROR
);
275 sk_ASN1_TYPE_pop_free(ndsa
, ASN1_TYPE_free
);
281 static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO
*p8
, EVP_PKEY
*pkey
)
283 ASN1_STRING
*params
= NULL
;
284 ASN1_INTEGER
*prkey
= NULL
;
285 unsigned char *dp
= NULL
;
288 params
= ASN1_STRING_new();
292 DSAerr(DSA_F_DSA_PRIV_ENCODE
,ERR_R_MALLOC_FAILURE
);
296 params
->length
= i2d_DSAparams(pkey
->pkey
.dsa
, ¶ms
->data
);
297 if (params
->length
<= 0)
299 DSAerr(DSA_F_DSA_PRIV_ENCODE
,ERR_R_MALLOC_FAILURE
);
302 params
->type
= V_ASN1_SEQUENCE
;
304 /* Get private key into integer */
305 prkey
= BN_to_ASN1_INTEGER(pkey
->pkey
.dsa
->priv_key
, NULL
);
309 DSAerr(DSA_F_DSA_PRIV_ENCODE
,DSA_R_BN_ERROR
);
313 dplen
= i2d_ASN1_INTEGER(prkey
, &dp
);
315 ASN1_INTEGER_free(prkey
);
317 if (!PKCS8_pkey_set0(p8
, OBJ_nid2obj(NID_dsa
), 0,
318 V_ASN1_SEQUENCE
, params
, dp
, dplen
))
327 ASN1_STRING_free(params
);
329 ASN1_INTEGER_free(prkey
);
333 /* NB these are sorted in pkey_id order, lowest first */
335 const EVP_PKEY_ASN1_METHOD dsa_asn1_meths
[] =