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[] =