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[openssl.git] / crypto / dh / dh_asn1.c
1 /*
2  * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/bn.h>
13 #include "dh_locl.h"
14 #include <openssl/objects.h>
15 #include <openssl/asn1t.h>
16
17 /* Override the default free and new methods */
18 static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
19                  void *exarg)
20 {
21     if (operation == ASN1_OP_NEW_PRE) {
22         *pval = (ASN1_VALUE *)DH_new();
23         if (*pval != NULL)
24             return 2;
25         return 0;
26     } else if (operation == ASN1_OP_FREE_PRE) {
27         DH_free((DH *)*pval);
28         *pval = NULL;
29         return 2;
30     }
31     return 1;
32 }
33
34 ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
35         ASN1_SIMPLE(DH, p, BIGNUM),
36         ASN1_SIMPLE(DH, g, BIGNUM),
37         ASN1_OPT_EMBED(DH, length, ZINT32),
38 } ASN1_SEQUENCE_END_cb(DH, DHparams)
39
40 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
41
42 /*
43  * Internal only structures for handling X9.42 DH: this gets translated to or
44  * from a DH structure straight away.
45  */
46
47 typedef struct {
48     ASN1_BIT_STRING *seed;
49     BIGNUM *counter;
50 } int_dhvparams;
51
52 typedef struct {
53     BIGNUM *p;
54     BIGNUM *q;
55     BIGNUM *g;
56     BIGNUM *j;
57     int_dhvparams *vparams;
58 } int_dhx942_dh;
59
60 ASN1_SEQUENCE(DHvparams) = {
61         ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
62         ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
63 } static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
64
65 ASN1_SEQUENCE(DHxparams) = {
66         ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM),
67         ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM),
68         ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM),
69         ASN1_OPT(int_dhx942_dh, j, BIGNUM),
70         ASN1_OPT(int_dhx942_dh, vparams, DHvparams),
71 } static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
72
73 int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a,
74                            const unsigned char **pp, long length);
75 int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp);
76
77 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
78
79 /* Application public function: read in X9.42 DH parameters into DH structure */
80
81 DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length)
82 {
83     int_dhx942_dh *dhx = NULL;
84     DH *dh = NULL;
85     dh = DH_new();
86     if (dh == NULL)
87         return NULL;
88     dhx = d2i_int_dhx(NULL, pp, length);
89     if (dhx == NULL) {
90         DH_free(dh);
91         return NULL;
92     }
93
94     if (a) {
95         DH_free(*a);
96         *a = dh;
97     }
98
99     dh->p = dhx->p;
100     dh->q = dhx->q;
101     dh->g = dhx->g;
102     dh->j = dhx->j;
103
104     if (dhx->vparams) {
105         dh->seed = dhx->vparams->seed->data;
106         dh->seedlen = dhx->vparams->seed->length;
107         dh->counter = dhx->vparams->counter;
108         dhx->vparams->seed->data = NULL;
109         ASN1_BIT_STRING_free(dhx->vparams->seed);
110         OPENSSL_free(dhx->vparams);
111         dhx->vparams = NULL;
112     }
113
114     OPENSSL_free(dhx);
115     return dh;
116 }
117
118 int i2d_DHxparams(const DH *dh, unsigned char **pp)
119 {
120     int_dhx942_dh dhx;
121     int_dhvparams dhv;
122     ASN1_BIT_STRING bs;
123     dhx.p = dh->p;
124     dhx.g = dh->g;
125     dhx.q = dh->q;
126     dhx.j = dh->j;
127     if (dh->counter && dh->seed && dh->seedlen > 0) {
128         bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
129         bs.data = dh->seed;
130         bs.length = dh->seedlen;
131         dhv.seed = &bs;
132         dhv.counter = dh->counter;
133         dhx.vparams = &dhv;
134     } else
135         dhx.vparams = NULL;
136
137     return i2d_int_dhx(&dhx, pp);
138 }