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/dh.h>
63 #include "asn1_locl.h"
65 static void int_dh_free(EVP_PKEY
*pkey
)
67 DH_free(pkey
->pkey
.dh
);
70 static int dh_pub_decode(EVP_PKEY
*pkey
, X509_PUBKEY
*pubkey
)
72 const unsigned char *p
, *pm
;
78 ASN1_INTEGER
*public_key
= NULL
;
82 if (!X509_PUBKEY_get0_param(NULL
, &p
, &pklen
, &palg
, pubkey
))
84 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
86 if (ptype
!= V_ASN1_SEQUENCE
)
88 DHerr(DH_F_DH_PUB_DECODE
, DH_R_PARAMETER_ENCODING_ERROR
);
96 if (!(dh
= d2i_DHparams(NULL
, &pm
, pmlen
)))
98 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
102 if (!(public_key
=d2i_ASN1_INTEGER(NULL
, &p
, pklen
)))
104 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
108 /* We have parameters now set public key */
109 if (!(dh
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
)))
111 DHerr(DH_F_DH_PUB_DECODE
, DH_R_BN_DECODE_ERROR
);
115 ASN1_INTEGER_free(public_key
);
116 EVP_PKEY_assign_DH(pkey
, dh
);
121 ASN1_INTEGER_free(public_key
);
128 static int dh_pub_encode(X509_PUBKEY
*pk
, const EVP_PKEY
*pkey
)
133 unsigned char *penc
= NULL
;
136 ASN1_INTEGER
*pub_key
= NULL
;
140 str
= ASN1_STRING_new();
141 str
->length
= i2d_DHparams(dh
, &str
->data
);
142 if (str
->length
<= 0)
144 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
148 ptype
= V_ASN1_SEQUENCE
;
150 pub_key
= BN_to_ASN1_INTEGER(dh
->pub_key
, NULL
);
154 penclen
= i2d_ASN1_INTEGER(pub_key
, &penc
);
156 ASN1_INTEGER_free(pub_key
);
160 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
164 if (X509_PUBKEY_set0_param(pk
, OBJ_nid2obj(EVP_PKEY_DH
),
165 ptype
, pval
, penc
, penclen
))
172 ASN1_STRING_free(pval
);
178 /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
179 * that the AlgorithmIdentifier contains the paramaters, the private key
180 * is explcitly included and the pubkey must be recalculated.
183 static int dh_priv_decode(EVP_PKEY
*pkey
, PKCS8_PRIV_KEY_INFO
*p8
)
185 const unsigned char *p
, *pm
;
191 ASN1_INTEGER
*privkey
= NULL
;
195 if (!PKCS8_pkey_get0(NULL
, &p
, &pklen
, &palg
, p8
))
198 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
200 if (ptype
!= V_ASN1_SEQUENCE
)
203 if (!(privkey
=d2i_ASN1_INTEGER(NULL
, &p
, pklen
)))
209 pmlen
= pstr
->length
;
210 if (!(dh
= d2i_DHparams(NULL
, &pm
, pmlen
)))
212 /* We have parameters now set private key */
213 if (!(dh
->priv_key
= ASN1_INTEGER_to_BN(privkey
, NULL
)))
215 DHerr(DH_F_DH_PRIV_DECODE
,DH_R_BN_ERROR
);
218 /* Calculate public key */
219 if (!DH_generate_key(dh
))
222 EVP_PKEY_assign_DH(pkey
, dh
);
224 ASN1_INTEGER_free(privkey
);
229 DHerr(DH_F_DH_PRIV_DECODE
, EVP_R_DECODE_ERROR
);
235 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO
*p8
, const EVP_PKEY
*pkey
)
237 ASN1_STRING
*params
= NULL
;
238 ASN1_INTEGER
*prkey
= NULL
;
239 unsigned char *dp
= NULL
;
242 params
= ASN1_STRING_new();
246 DHerr(DH_F_DH_PRIV_ENCODE
,ERR_R_MALLOC_FAILURE
);
250 params
->length
= i2d_DHparams(pkey
->pkey
.dh
, ¶ms
->data
);
251 if (params
->length
<= 0)
253 DHerr(DH_F_DH_PRIV_ENCODE
,ERR_R_MALLOC_FAILURE
);
256 params
->type
= V_ASN1_SEQUENCE
;
258 /* Get private key into integer */
259 prkey
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->priv_key
, NULL
);
263 DHerr(DH_F_DH_PRIV_ENCODE
,DH_R_BN_ERROR
);
267 dplen
= i2d_ASN1_INTEGER(prkey
, &dp
);
269 ASN1_INTEGER_free(prkey
);
271 if (!PKCS8_pkey_set0(p8
, OBJ_nid2obj(NID_dhKeyAgreement
), 0,
272 V_ASN1_SEQUENCE
, params
, dp
, dplen
))
281 ASN1_STRING_free(params
);
283 ASN1_INTEGER_free(prkey
);
288 static void update_buflen(const BIGNUM
*b
, size_t *pbuflen
)
293 if (*pbuflen
< (i
= (size_t)BN_num_bytes(b
)))
297 static int dh_param_decode(EVP_PKEY
*pkey
,
298 const unsigned char **pder
, int derlen
)
301 if (!(dh
= d2i_DHparams(NULL
, pder
, derlen
)))
303 DHerr(DH_F_DH_PARAM_DECODE
, ERR_R_DH_LIB
);
306 EVP_PKEY_assign_DH(pkey
, dh
);
310 static int dh_param_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
312 return i2d_DHparams(pkey
->pkey
.dh
, pder
);
315 static int do_dh_print(BIO
*bp
, const DH
*x
, int indent
,
316 ASN1_PCTX
*ctx
, int ptype
)
318 unsigned char *m
=NULL
;
319 int reason
=ERR_R_BUF_LIB
,ret
=0;
322 const char *ktype
= NULL
;
324 BIGNUM
*priv_key
, *pub_key
;
327 priv_key
= x
->priv_key
;
332 pub_key
= x
->pub_key
;
336 update_buflen(x
->p
, &buf_len
);
340 reason
= ERR_R_PASSED_NULL_PARAMETER
;
344 update_buflen(x
->g
, &buf_len
);
345 update_buflen(pub_key
, &buf_len
);
346 update_buflen(priv_key
, &buf_len
);
349 ktype
= "PKCS#3 DH Private-Key";
351 ktype
= "PKCS#3 DH Public-Key";
353 ktype
= "PKCS#3 DH Parameters";
355 m
= OPENSSL_malloc(buf_len
+10);
358 reason
=ERR_R_MALLOC_FAILURE
;
362 BIO_indent(bp
, indent
, 128);
363 if (BIO_printf(bp
,"%s: (%d bit)\n", ktype
, BN_num_bits(x
->p
)) <= 0)
367 if (!ASN1_bn_print(bp
,"private-key:",priv_key
,m
,indent
)) goto err
;
368 if (!ASN1_bn_print(bp
,"public-key:",pub_key
,m
,indent
)) goto err
;
370 if (!ASN1_bn_print(bp
,"prime:",x
->p
,m
,indent
)) goto err
;
371 if (!ASN1_bn_print(bp
,"generator:",x
->g
,m
,indent
)) goto err
;
374 BIO_indent(bp
, indent
, 128);
375 if (BIO_printf(bp
,"recommended-private-length: %d bits\n",
376 (int)x
->length
) <= 0) goto err
;
384 DHerr(DH_F_DHPARAMS_PRINT
,reason
);
386 if (m
!= NULL
) OPENSSL_free(m
);
390 static int int_dh_size(const EVP_PKEY
*pkey
)
392 return(DH_size(pkey
->pkey
.dh
));
395 static int dh_bits(const EVP_PKEY
*pkey
)
397 return BN_num_bits(pkey
->pkey
.dh
->p
);
400 static int dh_cmp_parameters(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
402 if ( BN_cmp(a
->pkey
.dh
->p
,b
->pkey
.dh
->p
) ||
403 BN_cmp(a
->pkey
.dh
->g
,b
->pkey
.dh
->g
))
409 static int dh_copy_parameters(EVP_PKEY
*to
, const EVP_PKEY
*from
)
413 if ((a
=BN_dup(from
->pkey
.dh
->p
)) == NULL
)
415 if (to
->pkey
.dh
->p
!= NULL
)
416 BN_free(to
->pkey
.dh
->p
);
419 if ((a
=BN_dup(from
->pkey
.dh
->g
)) == NULL
)
421 if (to
->pkey
.dh
->g
!= NULL
)
422 BN_free(to
->pkey
.dh
->g
);
428 static int dh_missing_parameters(const EVP_PKEY
*a
)
430 if (!a
->pkey
.dh
->p
|| !a
->pkey
.dh
->g
)
435 static int dh_pub_cmp(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
437 if (dh_cmp_parameters(a
, b
) == 0)
439 if (BN_cmp(b
->pkey
.dh
->pub_key
,a
->pkey
.dh
->pub_key
) != 0)
445 static int dh_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
448 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 0);
451 static int dh_public_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
454 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 1);
457 static int dh_private_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
460 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 2);
463 int DHparams_print(BIO
*bp
, const DH
*x
)
465 return do_dh_print(bp
, x
, 4, NULL
, 0);
468 const EVP_PKEY_ASN1_METHOD dh_asn1_meth
=
475 "OpenSSL PKCS#3 DH method",
491 dh_missing_parameters
,